filesystem: Add QFSEngine for filepaths

Change-Id: Ibd0c88c69863c0877138d8cc45541530c359bd9c
Reviewed-by: hjk <hjk@qt.io>

src/app/main.cpp

@@ -35,6 +35,7 @@
 #include <utils/algorithm.h>
 #include <utils/environment.h>
 #include <utils/fileutils.h>
+#include <utils/fsengine/fsengine.h>
 #include <utils/hostosinfo.h>
 #include <utils/optional.h>
 #include <utils/qtcsettings.h>
@@ -451,6 +452,8 @@ int main(int argc, char **argv)
     Restarter restarter(argc, argv);
     Utils::Environment::systemEnvironment(); // cache system environment before we do any changes
 
+    Utils::FSEngine fileSystemEngine;
+
     // Manually determine various command line options
     // We can't use the regular way of the plugin manager,
     // because settings can change the way plugin manager behaves

src/libs/utils/CMakeLists.txt

@@ -57,6 +57,8 @@ add_qtc_library(Utils
     filewizardpage.cpp filewizardpage.h
     fixedsizeclicklabel.cpp fixedsizeclicklabel.h
     flowlayout.cpp flowlayout.h
+    fsengine/fsengine.cpp fsengine/fsengine.h
+    fsengine/fileiconprovider.cpp fsengine/fileiconprovider.h
     functiontraits.h
     futuresynchronizer.cpp futuresynchronizer.h
     fuzzymatcher.cpp fuzzymatcher.h
@@ -247,6 +249,20 @@ extend_qtc_library(Utils CONDITION UNIX AND NOT APPLE
     touchbar/touchbar.cpp
 )
 
+extend_qtc_library(Utils
+  CONDITION TARGET Qt5::CorePrivate
+  DEPENDS Qt5::CorePrivate
+  DEFINES QTC_UTILS_WITH_FSENGINE
+  SOURCES fsengine/fsengine_impl.cpp
+          fsengine/fsengine_impl.h
+          fsengine/diriterator.h
+          fsengine/fileiteratordevicesappender.h
+          fsengine/rootinjectfsengine.h
+          fsengine/fixedlistfsengine.h
+          fsengine/fsenginehandler.cpp
+          fsengine/fsenginehandler.h
+)
+
 if (WIN32)
   add_qtc_executable(qtcreator_process_stub
     SOURCES process_stub_win.c
@@ -263,3 +279,4 @@ if (WIN32)
 else()
   add_qtc_executable(qtcreator_process_stub SOURCES process_stub_unix.c)
 endif()
+

src/libs/utils/filepath.cpp

@@ -39,6 +39,7 @@
 #include <QRegularExpression>
 #include <QStorageInfo>
 #include <QUrl>
+#include <QStringView>
 
 #ifdef Q_OS_WIN
 #ifdef QTCREATOR_PCH_H
@@ -480,9 +481,20 @@ QString FilePath::toString() const
 {
     if (m_scheme.isEmpty())
         return m_data;
+
     if (m_data.startsWith('/'))
-        return m_scheme + "://" + hostEncoded(m_host) + m_data;
-    return m_scheme + "://" + hostEncoded(m_host) + "/./" + m_data;
+        return specialPath(SpecialPathComponent::RootPath) + "/" + m_scheme + "/" + hostEncoded(m_host) + m_data;
+    return specialPath(SpecialPathComponent::RootPath) + "/" + m_scheme + "/" + hostEncoded(m_host) + "/./" + m_data;
+}
+
+QString FilePath::toFSPathString() const
+{
+    if (m_scheme.isEmpty())
+        return m_data;
+
+    if (m_data.startsWith('/'))
+        return specialPath(SpecialPathComponent::RootPath) + "/" + m_scheme + "/" + hostEncoded(m_host) + m_data;
+    return specialPath(SpecialPathComponent::RootPath) + "/" + m_scheme + "/" + hostEncoded(m_host) + "/./" + m_data;
 }
 
 QUrl FilePath::toUrl() const
@@ -504,6 +516,12 @@ void FileUtils::setDeviceFileHooks(const DeviceFileHooks &hooks)
 /// this path belongs to.
 QString FilePath::toUserOutput() const
 {
+    if (needsDevice()) {
+        if (m_data.startsWith('/'))
+            return m_scheme + "://" + hostEncoded(m_host) + m_data;
+        return m_scheme + "://" + hostEncoded(m_host) + "/./" + m_data;
+    }
+
     FilePath tmp = *this;
     if (osType() == OsTypeWindows)
         tmp.m_data.replace('/', '\\');
@@ -941,6 +959,27 @@ FilePath FilePath::absoluteFilePath() const
     return result;
 }
 
+QString FilePath::specialPath(SpecialPathComponent component)
+{
+    switch (component) {
+    case SpecialPathComponent::RootName:
+        return QLatin1String("__qtc_devices__");
+    case SpecialPathComponent::RootPath:
+        return (QDir::rootPath() + "__qtc_devices__");
+    case SpecialPathComponent::DeviceRootName:
+        return QLatin1String("device");
+    case SpecialPathComponent::DeviceRootPath:
+        return QDir::rootPath() + "__qtc_devices__/device";
+    }
+
+    QTC_ASSERT(false, return {});
+}
+
+FilePath FilePath::specialFilePath(SpecialPathComponent component)
+{
+    return FilePath::fromString(specialPath(component));
+}
+
 FilePath FilePath::normalizedPathName() const
 {
     FilePath result = *this;
@@ -1005,28 +1044,88 @@ FilePath FilePath::fromString(const QString &filepath)
 
 void FilePath::setFromString(const QString &filename)
 {
-    if (filename.startsWith('/')) {
-        m_data = filename;  // fast track: absolute local paths
-    } else {
-        int pos1 = filename.indexOf("://");
-        if (pos1 >= 0) {
-            m_scheme = filename.left(pos1);
-            pos1 += 3;
-            int pos2 = filename.indexOf('/', pos1);
-            if (pos2 == -1) {
-                m_data = filename.mid(pos1);
-            } else {
-                m_host = filename.mid(pos1, pos2 - pos1);
-                m_host.replace("%2f", "/");
-                m_host.replace("%25", "%");
-                m_data = filename.mid(pos2);
+#ifndef UTILS_FILEPATH_USE_REGEXP
+    static const QLatin1String qtcDevSlash("__qtc_devices__/");
+
+    const QStringView fileNameView(filename);
+    const QString rootPath = QDir::rootPath();
+
+    if (fileNameView.startsWith(rootPath, Qt::CaseInsensitive)) { // Absolute path ...
+        const QStringView withoutRootPath = fileNameView.mid(rootPath.size());
+        if (withoutRootPath.startsWith(qtcDevSlash)) { // Starts with "/__qtc_devices__/" ...
+            const QStringView withoutQtcDeviceRoot = withoutRootPath.mid(qtcDevSlash.size());
+
+            const auto firstSlash = withoutQtcDeviceRoot.indexOf('/');
+
+            if (firstSlash != -1) {
+                m_scheme = withoutQtcDeviceRoot.left(firstSlash).toString();
+                const auto secondSlash = withoutQtcDeviceRoot.indexOf('/', firstSlash + 1);
+                m_host = withoutQtcDeviceRoot.mid(firstSlash + 1, secondSlash - firstSlash - 1)
+                             .toString();
+                if (secondSlash != -1) {
+                    const QStringView path = withoutQtcDeviceRoot.mid(secondSlash);
+                    m_data = path.startsWith(QLatin1String("/./")) ? path.mid(3).toString()
+                                                                   : path.toString();
+                    return;
+                }
+                m_data = "/";
+
+                return;
             }
-            if (m_data.startsWith("/./"))
-                m_data = m_data.mid(3);
-        } else {
-            m_data = filename; // treat everything else as local, too.
+            m_scheme = "";
+            m_host = "";
+            m_data = filename;
+
+            return;
         }
     }
+
+    const auto firstSlash = filename.indexOf('/');
+    const auto schemeEnd = filename.indexOf("://");
+    if (schemeEnd != -1 && schemeEnd < firstSlash) {
+        // This is a pseudo Url, we can't use QUrl here sadly.
+        m_scheme = filename.left(schemeEnd);
+        const auto hostEnd = filename.indexOf('/', schemeEnd + 3);
+        m_host = filename.mid(schemeEnd + 3, hostEnd - schemeEnd - 3);
+        m_data = filename.mid(hostEnd);
+
+        return;
+    }
+
+    m_data = filename;
+
+    return;
+#else
+    // Convert the root path ( "/" or e.g. "c:/") to a regex match string ( e.g. ^[(?i)c(?-i)]:\/ )
+    // (?i) will turn on case insensitivity, (?-i) will turn it off again.
+    static const QString rootPart = '^'
+                                    + QDir::rootPath()
+                                          .replace('/', "\\/")
+                                          .replace(QRegularExpression("([a-zA-Z])"),
+                                                   R"((?i)[\1](?-i))");
+
+    static const QString pathPattern = rootPart + specialPath(SpecialPathComponent::RootName)
+                                       + QString(R"(\/([^\/]+)\/([^\/]+)(\/.*)?)");
+
+    static const QRegularExpression rePath(pathPattern);
+    static const QRegularExpression reUrl(R"(^\/?([^:]+):\/{2}([^\/]*)(\/.*))");
+
+    const auto m = filename.startsWith(specialPath(SpecialPathComponent::RootPath),
+                                       Qt::CaseInsensitive)
+                       ? rePath.match(filename)
+                       : reUrl.match(filename);
+
+    if (m.hasMatch()) {
+        m_scheme = m.captured(1);
+        m_host = m.captured(2);
+        m_host.replace("%2f", "/");
+        m_host.replace("%25", "%");
+
+        m_data = m.captured(3).isEmpty() ? "/" : m.captured(3);
+    } else {
+        m_data = filename;
+    }
+#endif
 }
 
 /// Constructs a FilePath from \a filePath. The \a defaultExtension is appended

src/libs/utils/filepath.h

@@ -78,6 +78,7 @@ public:
 
     QString toUserOutput() const;
     QString toString() const;
+    QString toFSPathString() const;
     QVariant toVariant() const;
     QUrl toUrl() const;
 
@@ -210,6 +211,16 @@ public:
     [[nodiscard]] FilePath absolutePath() const; // Avoid. Use resolvePath(...)[.parent()] with proper base.
     [[nodiscard]] FilePath absoluteFilePath() const; // Avoid. Use resolvePath(...) with proper base.
 
+    enum class SpecialPathComponent {
+        RootName,
+        RootPath,
+        DeviceRootName,
+        DeviceRootPath,
+    };
+
+    [[nodiscard]] static QString specialPath(SpecialPathComponent component);
+    [[nodiscard]] static FilePath specialFilePath(SpecialPathComponent component);
+
 private:
     friend class ::tst_fileutils;
     static QString calcRelativePath(const QString &absolutePath, const QString &absoluteAnchorPath);

src/libs/utils/fileutils.cpp

@@ -29,6 +29,9 @@
 #include "algorithm.h"
 #include "qtcassert.h"
 
+#include "fsengine/fileiconprovider.h"
+#include "fsengine/fsengine.h"
+
 #include <QDataStream>
 #include <QDebug>
 #include <QOperatingSystemVersion>
@@ -41,6 +44,7 @@
 #ifdef QT_GUI_LIB
 #include <QMessageBox>
 #include <QRegularExpression>
+#include <QGuiApplication>
 #endif
 
 #ifdef Q_OS_WIN
@@ -438,8 +442,15 @@ FilePath FileUtils::getOpenFilePath(QWidget *parent,
                                     const FilePath &dir,
                                     const QString &filter,
                                     QString *selectedFilter,
-                                    QFileDialog::Options options)
+                                    QFileDialog::Options options,
+                                    bool fromDeviceIfShiftIsPressed)
 {
+#ifdef QT_GUI_LIB
+    if (fromDeviceIfShiftIsPressed && qApp->queryKeyboardModifiers() & Qt::ShiftModifier) {
+        return getOpenFilePathFromDevice(parent, caption, dir, filter, selectedFilter, options);
+    }
+#endif
+
     const QString result = QFileDialog::getOpenFileName(dialogParent(parent),
                                                         caption,
                                                         dir.toString(),
@@ -493,6 +504,47 @@ FilePaths FileUtils::getOpenFilePaths(QWidget *parent,
     return transform(result, &FilePath::fromString);
 }
 
+FilePath FileUtils::getOpenFilePathFromDevice(QWidget *parent,
+                                              const QString &caption,
+                                              const FilePath &dir,
+                                              const QString &filter,
+                                              QString *selectedFilter,
+                                              QFileDialog::Options options)
+{
+    QFileDialog dialog;
+    dialog.setOptions(options | QFileDialog::DontUseNativeDialog);
+    dialog.setWindowTitle(caption);
+    dialog.setDirectory(dir.toString());
+    dialog.setNameFilter(filter);
+
+    QList<QUrl> sideBarUrls = Utils::transform(Utils::filtered(FSEngine::registeredDeviceRoots(),
+                                                               [](const auto &filePath) {
+                                                                   return filePath.exists();
+                                                               }),
+                                               [](const auto &filePath) {
+                                                   return QUrl::fromLocalFile(
+                                                       filePath.toFSPathString());
+                                               });
+    dialog.setSidebarUrls(sideBarUrls);
+    dialog.setFileMode(QFileDialog::AnyFile);
+
+    dialog.setIconProvider(Utils::FileIconProvider::iconProvider());
+
+    if (dialog.exec()) {
+        FilePaths filePaths = Utils::transform(dialog.selectedFiles(), [](const auto &path) {
+            return FilePath::fromString(path);
+        });
+
+        if (selectedFilter) {
+            *selectedFilter = dialog.selectedNameFilter();
+        }
+
+        return filePaths.first();
+    }
+
+    return {};
+}
+
 // Used on 'ls' output on unix-like systems.
 void FileUtils::iterateLsOutput(const FilePath &base,
                                 const QStringList &entries,

src/libs/utils/fileutils.h

@@ -152,7 +152,8 @@ public:
                                     const FilePath &dir = {},
                                     const QString &filter = {},
                                     QString *selectedFilter = nullptr,
-                                    QFileDialog::Options options = {});
+                                    QFileDialog::Options options = {},
+                                    bool fromDeviceIfShiftIsPressed = false);
 
     static FilePath getSaveFilePath(QWidget *parent,
                                     const QString &caption,
@@ -172,6 +173,13 @@ public:
                                       const QString &filter = {},
                                       QString *selectedFilter = nullptr,
                                       QFileDialog::Options options = {});
+
+    static FilePath getOpenFilePathFromDevice(QWidget *parent,
+                                              const QString &caption,
+                                              const FilePath &dir = {},
+                                              const QString &filter = {},
+                                              QString *selectedFilter = nullptr,
+                                              QFileDialog::Options options = {});
 #endif
 
 };

src/libs/utils/fsengine/diriterator.h

@@ -0,0 +1,73 @@
+/****************************************************************************
+**
+** Copyright (C) 2022 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+#include "../filepath.h"
+#include "../stringutils.h"
+
+#include <QFileInfo>
+#include <QString>
+
+#include <QtCore/private/qabstractfileengine_p.h>
+
+namespace Utils {
+namespace Internal {
+
+class DirIterator : public QAbstractFileEngineIterator
+{
+public:
+    DirIterator(FilePaths paths)
+        : QAbstractFileEngineIterator({}, {})
+        , m_filePaths(std::move(paths))
+        , it(m_filePaths.begin())
+    {}
+
+    // QAbstractFileEngineIterator interface
+public:
+    QString next() override
+    {
+        if (it == m_filePaths.end())
+            return QString();
+        const QString r = currentFilePath();
+        ++it;
+        return r;
+    }
+    bool hasNext() const override { return !m_filePaths.empty() && m_filePaths.end() != it + 1; }
+    QString currentFileName() const override { return chopIfEndsWith(it->toString(), '/'); }
+
+    QFileInfo currentFileInfo() const override
+    {
+        return QFileInfo(chopIfEndsWith(it->toString(), '/'));
+    }
+
+private:
+    const FilePaths m_filePaths;
+    FilePaths::const_iterator it;
+};
+
+} // namespace Internal
+
+} // namespace Utils

src/libs/utils/fsengine/fileiconprovider.cpp

@@ -41,11 +41,14 @@
 
 #include <QFileIconProvider>
 #include <QIcon>
+#include <QLoggingCategory>
 
 using namespace Utils;
 
+Q_LOGGING_CATEGORY(fileIconProvider, "qtc.core.fileiconprovider", QtWarningMsg)
+
 /*!
-  \namespace Core::FileIconProvider
+  \namespace Utils::FileIconProvider
   \inmodule QtCreator
   \brief Provides functions for registering custom overlay icons for system
   icons.
@@ -64,11 +67,9 @@ using namespace Utils;
 
 using Item = Utils::variant<QIcon, QString>; // icon or filename for the icon
 
-namespace Core {
+namespace Utils {
 namespace FileIconProvider {
 
-enum { debug = 0 };
-
 static Utils::optional<QIcon> getIcon(QHash<QString, Item> &cache, const QString &key)
 {
     auto it = cache.constFind(key);
@@ -128,8 +129,44 @@ public:
     // Mapping of file suffix to icon.
     mutable QHash<QString, Item> m_suffixCache;
     mutable QHash<QString, Item> m_filenameCache;
+
+    // QAbstractFileIconProvider interface
+public:
+    QIcon icon(IconType) const override;
+    QIcon icon(const QFileInfo &) const override;
+    QString type(const QFileInfo &) const override;
 };
 
+QIcon FileIconProviderImplementation::icon(IconType type) const
+{
+    return QFileIconProvider::icon(type);
+}
+
+QIcon FileIconProviderImplementation::icon(const QFileInfo &fi) const
+{
+    return icon(FilePath::fromString(fi.filePath()));
+}
+
+QString FileIconProviderImplementation::type(const QFileInfo &fi) const
+{
+    const FilePath fPath = FilePath::fromString(fi.filePath());
+    if (fPath.needsDevice()) {
+        if (fPath.isDir()) {
+#ifdef Q_OS_WIN
+        return QGuiApplication::translate("QAbstractFileIconProvider", "File Folder", "Match Windows Explorer");
+#else
+        return QGuiApplication::translate("QAbstractFileIconProvider", "Folder", "All other platforms");
+#endif
+        }
+        if (fPath.isExecutableFile()) {
+            return "Program";
+        }
+
+        return QFileIconProvider::type(fi);
+    }
+    return QFileIconProvider::type(fi);
+}
+
 FileIconProviderImplementation *instance()
 {
     static FileIconProviderImplementation theInstance;
@@ -155,11 +192,20 @@ static const QIcon &dirIcon()
 
 QIcon FileIconProviderImplementation::icon(const FilePath &filePath) const
 {
-    if (debug)
-        qDebug() << "FileIconProvider::icon" << filePath.absoluteFilePath();
+    qCDebug(fileIconProvider) << "FileIconProvider::icon" << filePath.absoluteFilePath();
+
+    if (filePath.isEmpty())
+        return unknownFileIcon();
+
+    // Check if its one of the virtual devices directories
+    if (filePath.path().startsWith(FilePath::specialPath(FilePath::SpecialPathComponent::RootPath))) {
+        // If the filepath does not need a device, it is a virtual device directory
+        if (!filePath.needsDevice())
+            return dirIcon();
+    }
+
     bool isDir = filePath.isDir();
-    if (filePath.needsDevice())
-        return isDir ? dirIcon() : unknownFileIcon();
+
     // Check for cached overlay icons by file suffix.
     const QString filename = !isDir ? filePath.fileName() : QString();
     if (!filename.isEmpty()) {
@@ -167,6 +213,7 @@ QIcon FileIconProviderImplementation::icon(const FilePath &filePath) const
         if (icon)
             return *icon;
     }
+
     const QString suffix = !isDir ? filePath.suffix() : QString();
     if (!suffix.isEmpty()) {
         const Utils::optional<QIcon> icon = getIcon(m_suffixCache, suffix);
@@ -174,6 +221,9 @@ QIcon FileIconProviderImplementation::icon(const FilePath &filePath) const
             return *icon;
     }
 
+    if (filePath.needsDevice())
+        return isDir ? dirIcon() : unknownFileIcon();
+
     // Get icon from OS (and cache it based on suffix!)
     QIcon icon;
     if (HostOsInfo::isWindowsHost() || HostOsInfo::isMacHost())
@@ -263,7 +313,7 @@ QIcon directoryIcon(const QString &overlay)
     const QPixmap dirPixmap = QApplication::style()->standardIcon(QStyle::SP_DirIcon).pixmap(desiredSize);
     const QIcon overlayIcon(overlay);
     QIcon result;
-    result.addPixmap(Core::FileIconProvider::overlayIcon(dirPixmap, overlayIcon));
+    result.addPixmap(FileIconProvider::overlayIcon(dirPixmap, overlayIcon));
     return result;
 }
 

src/libs/utils/fsengine/fileiconprovider.h

@@ -25,33 +25,41 @@
 
 #pragma once
 
-#include <coreplugin/core_global.h>
+#include "../utils_global.h"
+
+#ifdef QT_GUI_LIB
 
-#include <QStyle>
 #include <QFileIconProvider>
+#include <QStyle>
 
-namespace Utils { class FilePath; }
-
-namespace Core {
+namespace Utils {
+class FilePath;
 
 namespace FileIconProvider {
 
 // Access to the single instance
-CORE_EXPORT QFileIconProvider *iconProvider();
+QTCREATOR_UTILS_EXPORT QFileIconProvider *iconProvider();
 
 // Access to individual items
-CORE_EXPORT QIcon icon(const Utils::FilePath &filePath);
-CORE_EXPORT QIcon icon(QFileIconProvider::IconType type);
+QTCREATOR_UTILS_EXPORT QIcon icon(const Utils::FilePath &filePath);
+QTCREATOR_UTILS_EXPORT QIcon icon(QFileIconProvider::IconType type);
 
 // Register additional overlay icons
-CORE_EXPORT QPixmap overlayIcon(const QPixmap &baseIcon, const QIcon &overlayIcon);
-CORE_EXPORT QPixmap overlayIcon(QStyle::StandardPixmap baseIcon, const QIcon &overlayIcon, const QSize &size);
-CORE_EXPORT void registerIconOverlayForSuffix(const QString &path, const QString &suffix);
-CORE_EXPORT void registerIconOverlayForFilename(const QString &path, const QString &filename);
-CORE_EXPORT void registerIconOverlayForMimeType(const QString &path, const QString &mimeType);
-CORE_EXPORT void registerIconOverlayForMimeType(const QIcon &icon, const QString &mimeType);
+QTCREATOR_UTILS_EXPORT QPixmap overlayIcon(const QPixmap &baseIcon, const QIcon &overlayIcon);
+QTCREATOR_UTILS_EXPORT QPixmap overlayIcon(QStyle::StandardPixmap baseIcon,
+                                           const QIcon &overlayIcon,
+                                           const QSize &size);
+QTCREATOR_UTILS_EXPORT void registerIconOverlayForSuffix(const QString &path, const QString &suffix);
+QTCREATOR_UTILS_EXPORT void registerIconOverlayForFilename(const QString &path,
+                                                           const QString &filename);
+QTCREATOR_UTILS_EXPORT void registerIconOverlayForMimeType(const QString &path,
+                                                           const QString &mimeType);
+QTCREATOR_UTILS_EXPORT void registerIconOverlayForMimeType(const QIcon &icon,
+                                                           const QString &mimeType);
 
-CORE_EXPORT QIcon directoryIcon(const QString &overlay);
+QTCREATOR_UTILS_EXPORT QIcon directoryIcon(const QString &overlay);
 
 } // namespace FileIconProvider
-} // namespace Core
+} // namespace Utils
+
+#endif

src/libs/utils/fsengine/fileiteratordevicesappender.h

@@ -0,0 +1,146 @@
+/****************************************************************************
+**
+** Copyright (C) 2022 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+#include "../filepath.h"
+
+#include <QtCore/private/qabstractfileengine_p.h>
+
+namespace Utils {
+namespace Internal {
+
+// Based on http://bloglitb.blogspot.com/2011/12/access-to-private-members-safer.htm
+template<typename Tag, typename Tag::type M>
+struct PrivateAccess
+{
+    friend typename Tag::type get(Tag) { return M; }
+};
+
+struct QAFEITag
+{
+    using type = void (QAbstractFileEngineIterator::*)(const QString &);
+    friend type get(QAFEITag);
+};
+
+template struct PrivateAccess<QAFEITag, &QAbstractFileEngineIterator::setPath>;
+
+class FileIteratorWrapper : public QAbstractFileEngineIterator
+{
+    enum class State {
+        NotIteratingRoot,
+        IteratingRoot,
+        BaseIteratorEnd,
+        Ended,
+    };
+
+public:
+    FileIteratorWrapper(std::unique_ptr<QAbstractFileEngineIterator> &&baseIterator,
+                        QDir::Filters filters,
+                        const QStringList &filterNames)
+        : QAbstractFileEngineIterator(filters, filterNames)
+        , m_baseIterator(std::move(baseIterator))
+    {}
+
+public:
+    QString next() override
+    {
+        if (m_status == State::Ended)
+            return QString();
+
+        setPath();
+        checkStatus();
+
+        if (m_status == State::BaseIteratorEnd) {
+            m_status = State::Ended;
+            return "__qtc__devices__";
+        }
+
+        return m_baseIterator->next();
+    }
+    bool hasNext() const override
+    {
+        if (m_status == State::Ended)
+            return false;
+
+        setPath();
+        checkStatus();
+
+        if (m_status == State::BaseIteratorEnd)
+            return true;
+
+        return m_baseIterator->hasNext();
+    }
+    QString currentFileName() const override
+    {
+        if (m_status == State::Ended)
+            return FilePath::specialPath(FilePath::SpecialPathComponent::RootPath);
+
+        setPath();
+        checkStatus();
+        return m_baseIterator->currentFileName();
+    }
+    QFileInfo currentFileInfo() const override
+    {
+        if (m_status == State::Ended)
+            return QFileInfo(FilePath::specialPath(FilePath::SpecialPathComponent::RootPath));
+        setPath();
+        checkStatus();
+        return m_baseIterator->currentFileInfo();
+    }
+
+private:
+    void setPath() const
+    {
+        if (!m_hasSetPath) {
+            const QString p = path();
+            if (p.toLower() == QDir::rootPath())
+                m_status = State::IteratingRoot;
+
+            ((*m_baseIterator).*get(QAFEITag()))(p);
+            m_hasSetPath = true;
+        }
+    }
+
+    void checkStatus() const
+    {
+        if (m_status == State::NotIteratingRoot) {
+            return;
+        }
+        if (m_status == State::IteratingRoot) {
+            if (m_baseIterator->hasNext() == false) {
+                m_status = State::BaseIteratorEnd;
+            }
+        }
+    }
+
+private:
+    std::unique_ptr<QAbstractFileEngineIterator> m_baseIterator;
+    mutable bool m_hasSetPath{false};
+    mutable State m_status{State::NotIteratingRoot};
+};
+
+} // namespace Internal
+} // namespace Utils

src/libs/utils/fsengine/fixedlistfsengine.h

@@ -0,0 +1,93 @@
+/****************************************************************************
+**
+** Copyright (C) 2022 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+#include "diriterator.h"
+
+#include "../filepath.h"
+#include "../stringutils.h"
+
+#include <QtCore/private/qabstractfileengine_p.h>
+
+namespace Utils {
+namespace Internal {
+
+class FixedListFSEngine : public QAbstractFileEngine
+{
+    const FilePath m_filePath;
+    FilePaths m_children;
+
+public:
+    FixedListFSEngine(FilePath path, const FilePaths children)
+        : m_filePath(std::move(path))
+        , m_children(std::move(children))
+    {
+        m_children.prepend(m_filePath.pathAppended("."));
+    }
+
+    // QAbstractFileEngine interface
+public:
+    bool isRelativePath() const override { return false; }
+    FileFlags fileFlags(FileFlags /*type*/) const override
+    {
+        return FileFlag::DirectoryType | FileFlag::ExistsFlag | FileFlag::ReadGroupPerm
+               | FileFlag::ReadUserPerm | FileFlag::ReadOwnerPerm | FileFlag::ReadOtherPerm;
+    }
+    QString fileName(FileName file) const override
+    {
+        switch (file) {
+        case QAbstractFileEngine::AbsoluteName:
+        case QAbstractFileEngine::DefaultName:
+        case QAbstractFileEngine::CanonicalName:
+            return chopIfEndsWith(m_filePath.toString(), '/');
+            break;
+        case QAbstractFileEngine::BaseName:
+            return m_filePath.baseName();
+            break;
+        case QAbstractFileEngine::PathName:
+        case QAbstractFileEngine::AbsolutePathName:
+        case QAbstractFileEngine::CanonicalPathName:
+            return chopIfEndsWith(m_filePath.parentDir().toString(), '/');
+            break;
+
+        default:
+        // case QAbstractFileEngine::LinkName:
+        // case QAbstractFileEngine::BundleName:
+        // case QAbstractFileEngine::JunctionName:
+            return {};
+            break;
+        }
+
+        return QAbstractFileEngine::fileName(file);
+    }
+    Iterator *beginEntryList(QDir::Filters /*filters*/, const QStringList & /*filterNames*/) override
+    {
+        return new DirIterator(m_children);
+    }
+};
+
+} // namespace Internal
+} // namespace Utils

src/libs/utils/fsengine/fsengine.cpp

@@ -0,0 +1,96 @@
+/****************************************************************************
+**
+** Copyright (C) 2022 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#include "fsengine.h"
+
+#ifdef QTC_UTILS_WITH_FSENGINE
+#include "fsenginehandler.h"
+#else
+class Utils::Internal::FSEngineHandler
+{};
+#endif
+
+#include <memory>
+
+namespace Utils {
+
+FSEngine::FSEngine()
+    : m_engineHandler(std::make_unique<Internal::FSEngineHandler>())
+{}
+
+FSEngine::~FSEngine() {}
+
+bool FSEngine::isAvailable()
+{
+#ifdef QTC_UTILS_WITH_FSENGINE
+    return true;
+#else
+    return false;
+#endif
+}
+
+FilePaths FSEngine::registeredDeviceRoots()
+{
+    return FSEngine::deviceRoots();
+}
+
+void FSEngine::addDevice(const FilePath &deviceRoot)
+{
+    deviceRoots().append(deviceRoot);
+}
+
+void FSEngine::removeDevice(const FilePath &deviceRoot)
+{
+    deviceRoots().removeAll(deviceRoot);
+}
+
+FilePaths &FSEngine::deviceRoots()
+{
+    static FilePaths g_deviceRoots;
+    return g_deviceRoots;
+}
+
+QStringList &FSEngine::deviceSchemes()
+{
+    static QStringList g_deviceSchemes {"device"};
+    return g_deviceSchemes;
+}
+
+void FSEngine::registerDeviceScheme(const QString &scheme)
+{
+    deviceSchemes().append(scheme);
+}
+
+void FSEngine::unregisterDeviceScheme(const QString &scheme)
+{
+    deviceSchemes().removeAll(scheme);
+}
+
+QStringList FSEngine::registeredDeviceSchemes()
+{
+    return FSEngine::deviceSchemes();
+}
+
+} // namespace Utils

src/libs/utils/fsengine/fsengine.h

@@ -0,0 +1,66 @@
+/****************************************************************************
+**
+** Copyright (C) 2022 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+#include "../filepath.h"
+#include "../utils_global.h"
+
+#include <memory>
+
+namespace Utils {
+
+namespace Internal {
+class FSEngineHandler;
+}
+
+class QTCREATOR_UTILS_EXPORT FSEngine
+{
+    friend class Internal::FSEngineHandler;
+
+public:
+    FSEngine();
+    ~FSEngine();
+
+public:
+    static bool isAvailable();
+
+    static Utils::FilePaths registeredDeviceRoots();
+    static void addDevice(const Utils::FilePath &deviceRoot);
+    static void removeDevice(const Utils::FilePath &deviceRoot);
+
+    static void registerDeviceScheme(const QString &scheme);
+    static void unregisterDeviceScheme(const QString &scheme);
+    static QStringList registeredDeviceSchemes();
+
+private:
+    static Utils::FilePaths &deviceRoots();
+    static QStringList &deviceSchemes();
+
+private:
+    std::unique_ptr<Internal::FSEngineHandler> m_engineHandler;
+};
+
+} // namespace Utils

src/libs/utils/fsengine/fsengine_impl.cpp

@@ -0,0 +1,352 @@
+/****************************************************************************
+**
+** Copyright (C) 2022 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#include "fsengine_impl.h"
+
+#include "diriterator.h"
+
+#include "../filepath.h"
+#include "../qtcassert.h"
+
+#include <QIODevice>
+#include <QDateTime>
+
+namespace Utils {
+
+namespace Internal {
+
+FSEngineImpl::FSEngineImpl(FilePath filePath)
+    : m_filePath(std::move(filePath))
+{}
+
+#if QT_VERSION >= QT_VERSION_CHECK(6, 3, 0)
+bool FSEngineImpl::open(QIODeviceBase::OpenMode openMode, std::optional<QFile::Permissions>)
+#else
+bool FSEngineImpl::open(QIODevice::OpenMode openMode)
+#endif
+{
+    QTC_ASSERT(m_tempStorage.open(), return false);
+
+    bool read = openMode & QIODevice::ReadOnly;
+    bool write = openMode & QIODevice::WriteOnly;
+    bool append = openMode & QIODevice::Append;
+
+    if (!write && !m_filePath.exists())
+        return false;
+
+    if (openMode & QIODevice::NewOnly && m_filePath.exists())
+        return false;
+
+    if (read || append) {
+        QTC_ASSERT(m_tempStorage.write(m_filePath.fileContents()) >= 0, return false);
+
+        if (!append)
+            m_tempStorage.seek(0);
+    }
+
+    if (write && !append)
+        m_hasChangedContent = true;
+
+    return true;
+}
+
+bool FSEngineImpl::close()
+{
+    QTC_ASSERT(flush(), return false);
+    m_tempStorage.close();
+    return true;
+}
+
+bool FSEngineImpl::flush()
+{
+    return syncToDisk();
+}
+
+bool FSEngineImpl::syncToDisk()
+{
+    if (m_hasChangedContent) {
+        const qint64 oldPos = m_tempStorage.pos();
+        QTC_ASSERT(m_tempStorage.seek(0), return false);
+        QTC_ASSERT(m_filePath.writeFileContents(m_tempStorage.readAll()), return false);
+        m_tempStorage.seek(oldPos);
+        m_hasChangedContent = false;
+        return true;
+    }
+
+    return true;
+}
+
+qint64 FSEngineImpl::size() const
+{
+    return m_filePath.fileSize();
+}
+
+qint64 FSEngineImpl::pos() const
+{
+    return m_tempStorage.pos();
+}
+
+bool FSEngineImpl::seek(qint64 pos)
+{
+    return m_tempStorage.seek(pos);
+}
+
+bool FSEngineImpl::isSequential() const
+{
+    return false;
+}
+
+bool FSEngineImpl::remove()
+{
+    return m_filePath.removeRecursively();
+}
+
+bool FSEngineImpl::copy(const QString &newName)
+{
+    return m_filePath.copyFile(FilePath::fromString(newName));
+}
+
+bool FSEngineImpl::rename(const QString &newName)
+{
+    return m_filePath.renameFile(FilePath::fromString(newName));
+}
+
+bool FSEngineImpl::renameOverwrite(const QString &newName)
+{
+    Q_UNUSED(newName)
+    return false;
+}
+
+bool FSEngineImpl::link(const QString &newName)
+{
+    Q_UNUSED(newName)
+    return false;
+}
+
+#if QT_VERSION >= QT_VERSION_CHECK(6, 3, 0)
+bool FSEngineImpl::mkdir(const QString &dirName, bool createParentDirectories,
+                         std::optional<QFile::Permissions>) const
+#else
+bool FSEngineImpl::mkdir(const QString &dirName, bool createParentDirectories) const
+#endif
+{
+    Q_UNUSED(createParentDirectories)
+    return FilePath::fromString(dirName).createDir();
+}
+
+bool FSEngineImpl::rmdir(const QString &dirName, bool recurseParentDirectories) const
+{
+    if (recurseParentDirectories)
+        return false;
+
+    return m_filePath.pathAppended(dirName).removeRecursively();
+}
+
+bool FSEngineImpl::setSize(qint64 size)
+{
+    return m_tempStorage.resize(size);
+}
+
+bool FSEngineImpl::caseSensitive() const
+{
+    // TODO?
+    return true;
+}
+
+bool FSEngineImpl::isRelativePath() const
+{
+    return false;
+}
+
+QStringList FSEngineImpl::entryList(QDir::Filters filters, const QStringList &filterNames) const
+{
+    QStringList result;
+    m_filePath.iterateDirectory(
+        [&result](const FilePath &p) {
+            result.append(p.toFSPathString());
+            return true;
+        },
+        {filterNames, filters});
+    return result;
+}
+
+QAbstractFileEngine::FileFlags FSEngineImpl::fileFlags(FileFlags type) const
+{
+    FileFlags result{0};
+
+    if (type & FileInfoAll && m_filePath.exists()) {
+        result |= QAbstractFileEngine::ExistsFlag;
+
+        if (type & DirectoryType && m_filePath.isDir())
+            result |= QAbstractFileEngine::DirectoryType;
+        if (type & FileType && m_filePath.isFile())
+            result |= QAbstractFileEngine::FileType;
+
+        if (type & PermsMask) {
+            result |= FileFlags::fromInt(m_filePath.permissions().toInt());
+        }
+    }
+
+    return result;
+}
+
+bool FSEngineImpl::setPermissions(uint /*perms*/)
+{
+    return false;
+}
+
+QByteArray FSEngineImpl::id() const
+{
+    return QAbstractFileEngine::id();
+}
+
+QString FSEngineImpl::fileName(FileName file) const
+{
+    switch (file) {
+    case QAbstractFileEngine::AbsoluteName:
+    case QAbstractFileEngine::DefaultName:
+        return m_filePath.toFSPathString();
+        break;
+    case QAbstractFileEngine::BaseName:
+        return m_filePath.baseName();
+        break;
+    case QAbstractFileEngine::PathName:
+    case QAbstractFileEngine::AbsolutePathName:
+        return m_filePath.parentDir().toFSPathString();
+        break;
+    case QAbstractFileEngine::CanonicalName:
+        return m_filePath.canonicalPath().toFSPathString();
+        break;
+    case QAbstractFileEngine::CanonicalPathName:
+        return m_filePath.canonicalPath().parentDir().toFSPathString();
+        break;
+    default:
+    // case QAbstractFileEngine::LinkName:
+    // case QAbstractFileEngine::BundleName:
+    // case QAbstractFileEngine::JunctionName:
+        return {};
+        break;
+
+    }
+
+    return QAbstractFileEngine::fileName(file);
+}
+
+uint FSEngineImpl::ownerId(FileOwner) const
+{
+    return 1;
+}
+
+QString FSEngineImpl::owner(FileOwner) const
+{
+    return "<unknown>";
+}
+
+bool FSEngineImpl::setFileTime(const QDateTime &newDate, FileTime time)
+{
+    Q_UNUSED(newDate)
+    Q_UNUSED(time)
+    return false;
+}
+
+QDateTime FSEngineImpl::fileTime(FileTime time) const
+{
+    Q_UNUSED(time)
+    return m_filePath.lastModified();
+}
+
+void FSEngineImpl::setFileName(const QString &file)
+{
+    close();
+    m_filePath = FilePath::fromString(file);
+}
+
+int FSEngineImpl::handle() const
+{
+    return 0;
+}
+
+bool FSEngineImpl::cloneTo(QAbstractFileEngine *target)
+{
+    return QAbstractFileEngine::cloneTo(target);
+}
+
+QAbstractFileEngine::Iterator *FSEngineImpl::beginEntryList(QDir::Filters filters,
+                                                            const QStringList &filterNames)
+{
+    FilePaths paths{m_filePath.pathAppended(".")};
+    m_filePath.iterateDirectory(
+        [&paths](const FilePath &p) {
+            paths.append(p);
+            return true;
+        },
+        {filterNames, filters});
+
+    return new DirIterator(paths);
+}
+
+QAbstractFileEngine::Iterator *FSEngineImpl::endEntryList()
+{
+    return nullptr;
+}
+
+qint64 FSEngineImpl::read(char *data, qint64 maxlen)
+{
+    return m_tempStorage.read(data, maxlen);
+}
+
+qint64 FSEngineImpl::readLine(char *data, qint64 maxlen)
+{
+    return m_tempStorage.readLine(data, maxlen);
+}
+
+qint64 FSEngineImpl::write(const char *data, qint64 len)
+{
+    qint64 bytesWritten = m_tempStorage.write(data, len);
+
+    if (bytesWritten > 0)
+        m_hasChangedContent = true;
+
+    return bytesWritten;
+}
+
+bool FSEngineImpl::extension(Extension extension,
+                             const ExtensionOption *option,
+                             ExtensionReturn *output)
+{
+    Q_UNUSED(extension)
+    Q_UNUSED(option)
+    Q_UNUSED(output)
+    return false;
+}
+
+bool FSEngineImpl::supportsExtension(Extension extension) const
+{
+    Q_UNUSED(extension)
+    return false;
+}
+
+} // namespace Internal
+} // namespace Utils

src/libs/utils/fsengine/fsengine_impl.h

@@ -0,0 +1,98 @@
+/****************************************************************************
+**
+** Copyright (C) 2022 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+#include "../filepath.h"
+
+#include <QtCore/private/qabstractfileengine_p.h>
+
+#include <QTemporaryFile>
+
+namespace Utils {
+namespace Internal {
+
+class FSEngineImpl : public QAbstractFileEngine
+{
+public:
+    FSEngineImpl(FilePath filePath);
+
+public:
+#if QT_VERSION >= QT_VERSION_CHECK(6, 3, 0)
+    bool open(QIODeviceBase::OpenMode openMode,
+              std::optional<QFile::Permissions> permissions = std::nullopt) override;
+    bool mkdir(const QString &dirName, bool createParentDirectories,
+              std::optional<QFile::Permissions> permissions = std::nullopt) const override;
+#else
+    bool open(QIODevice::OpenMode openMode) override;
+    bool mkdir(const QString &dirName, bool createParentDirectories) const override;
+#endif
+    bool close() override;
+    bool flush() override;
+    bool syncToDisk() override;
+    qint64 size() const override;
+    qint64 pos() const override;
+    bool seek(qint64 pos) override;
+    bool isSequential() const override;
+    bool remove() override;
+    bool copy(const QString &newName) override;
+    bool rename(const QString &newName) override;
+    bool renameOverwrite(const QString &newName) override;
+    bool link(const QString &newName) override;
+    bool rmdir(const QString &dirName, bool recurseParentDirectories) const override;
+    bool setSize(qint64 size) override;
+    bool caseSensitive() const override;
+    bool isRelativePath() const override;
+    QStringList entryList(QDir::Filters filters, const QStringList &filterNames) const override;
+    FileFlags fileFlags(FileFlags type) const override;
+    bool setPermissions(uint perms) override;
+    QByteArray id() const override;
+    QString fileName(FileName file) const override;
+    uint ownerId(FileOwner) const override;
+    QString owner(FileOwner) const override;
+    bool setFileTime(const QDateTime &newDate, FileTime time) override;
+    QDateTime fileTime(FileTime time) const override;
+    void setFileName(const QString &file) override;
+    int handle() const override;
+    bool cloneTo(QAbstractFileEngine *target) override;
+    Iterator *beginEntryList(QDir::Filters filters, const QStringList &filterNames) override;
+    Iterator *endEntryList() override;
+    qint64 read(char *data, qint64 maxlen) override;
+    qint64 readLine(char *data, qint64 maxlen) override;
+    qint64 write(const char *data, qint64 len) override;
+    bool extension(Extension extension,
+                   const ExtensionOption *option,
+                   ExtensionReturn *output) override;
+    bool supportsExtension(Extension extension) const override;
+
+private:
+    FilePath m_filePath;
+    QTemporaryFile m_tempStorage;
+
+    bool m_hasChangedContent{false};
+};
+
+} // namespace Internal
+} // namespace Utils

src/libs/utils/fsengine/fsenginehandler.cpp

@@ -0,0 +1,96 @@
+/****************************************************************************
+**
+** Copyright (C) 2022 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#include "fsenginehandler.h"
+
+#include "fixedlistfsengine.h"
+#include "fsengine_impl.h"
+#include "rootinjectfsengine.h"
+
+#include "fsengine.h"
+
+#include "../algorithm.h"
+
+namespace Utils {
+
+namespace Internal {
+
+QAbstractFileEngine *FSEngineHandler::create(const QString &fileName) const
+{
+    if (fileName.startsWith(':'))
+        return nullptr;
+
+    QString fixedFileName = fileName;
+
+    if (fileName.startsWith("//")) {
+        fixedFileName = fixedFileName.mid(1);
+    }
+    if (fixedFileName == FilePath::specialPath(FilePath::SpecialPathComponent::RootPath)) {
+        const FilePaths paths
+            = Utils::transform(FSEngine::registeredDeviceSchemes(), [](const QString &scheme) {
+                  return FilePath::specialFilePath(FilePath::SpecialPathComponent::RootPath)
+                      .pathAppended(scheme);
+              });
+
+        return new FixedListFSEngine(FilePath::specialFilePath(
+                                         FilePath::SpecialPathComponent::RootPath),
+                                     paths);
+    }
+
+    if (fixedFileName.startsWith(FilePath::specialPath(FilePath::SpecialPathComponent::RootPath))) {
+        const QStringList deviceSchemes = FSEngine::registeredDeviceSchemes();
+        for (const QString &scheme : deviceSchemes) {
+            if (fixedFileName
+                == FilePath::specialFilePath(FilePath::SpecialPathComponent::RootPath)
+                       .pathAppended(scheme)
+                       .toString()) {
+                const FilePaths filteredRoots = Utils::filtered(FSEngine::deviceRoots(),
+                                                                [scheme](const FilePath &root) {
+                                                                    return root.scheme() == scheme;
+                                                                });
+
+                return new FixedListFSEngine(FilePath::specialFilePath(
+                                                 FilePath::SpecialPathComponent::RootPath)
+                                                 .pathAppended(scheme),
+                                             filteredRoots);
+            }
+        }
+    }
+
+    FilePath filePath = FilePath::fromString(fixedFileName);
+    if (filePath.needsDevice()) {
+        return new FSEngineImpl(filePath);
+    }
+
+    if (fixedFileName.compare(QDir::rootPath(), Qt::CaseInsensitive) == 0) {
+        return new RootInjectFSEngine(fixedFileName);
+    }
+
+    return nullptr;
+}
+
+} // namespace Internal
+
+} // namespace Utils

src/libs/utils/fsengine/fsenginehandler.h

@@ -0,0 +1,42 @@
+/****************************************************************************
+**
+** Copyright (C) 2022 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+#include <QtCore/private/qabstractfileengine_p.h>
+
+namespace Utils {
+
+namespace Internal {
+
+class FSEngineHandler : public QAbstractFileEngineHandler
+{
+public:
+    QAbstractFileEngine *create(const QString &fileName) const override;
+};
+
+} // namespace Internal
+
+} // namespace Utils

src/libs/utils/fsengine/rootinjectfsengine.h

@@ -0,0 +1,50 @@
+/****************************************************************************
+**
+** Copyright (C) 2022 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+#include "fileiteratordevicesappender.h"
+
+#include <QtCore/private/qfsfileengine_p.h>
+
+namespace Utils {
+namespace Internal {
+
+class RootInjectFSEngine : public QFSFileEngine
+{
+public:
+    using QFSFileEngine::QFSFileEngine;
+
+public:
+    Iterator *beginEntryList(QDir::Filters filters, const QStringList &filterNames) override
+    {
+        std::unique_ptr<QAbstractFileEngineIterator> baseIterator(
+            QFSFileEngine::beginEntryList(filters, filterNames));
+        return new FileIteratorWrapper(std::move(baseIterator), filters, filterNames);
+    }
+};
+
+} // namespace Internal
+} // namespace Utils

src/libs/utils/mimetypes/mimedatabase.cpp

@@ -49,14 +49,14 @@
 
 #include <utils/fileutils.h>
 
-#include <QtCore/QCoreApplication>
-#include <QtCore/QFile>
-#include <QtCore/QFileInfo>
-#include <QtCore/QSet>
-#include <QtCore/QBuffer>
-#include <QtCore/QUrl>
-#include <QtCore/QStack>
-#include <QtCore/QDebug>
+#include <QCoreApplication>
+#include <QFile>
+#include <QFileInfo>
+#include <QSet>
+#include <QBuffer>
+#include <QUrl>
+#include <QStack>
+#include <QDebug>
 
 #include <algorithm>
 #include <functional>

src/libs/utils/mimetypes2/mimedatabase.cpp

@@ -49,12 +49,12 @@
 
 #include "algorithm.h"
 
-#include <QtCore/QFile>
-#include <QtCore/QFileInfo>
-#include <QtCore/QStandardPaths>
-#include <QtCore/QBuffer>
-#include <QtCore/QUrl>
-#include <QtCore/QDebug>
+#include <QFile>
+#include <QFileInfo>
+#include <QStandardPaths>
+#include <QBuffer>
+#include <QUrl>
+#include <QDebug>
 
 #include <algorithm>
 #include <functional>

src/libs/utils/pathchooser.cpp

@@ -33,6 +33,7 @@
 #include "qtcassert.h"
 #include "qtcprocess.h"
 
+#include <QGuiApplication>
 #include <QFileDialog>
 #include <QHBoxLayout>
 #include <QMenu>
@@ -194,6 +195,7 @@ public:
     QList<QAbstractButton *> m_buttons;
     const MacroExpander *m_macroExpander = globalMacroExpander();
     std::function<void()> m_openTerminal;
+    bool m_allowPathFromDevice = false;
 };
 
 PathChooserPrivate::PathChooserPrivate()
@@ -420,40 +422,46 @@ void PathChooser::slotBrowse()
     case PathChooser::Directory:
     case PathChooser::ExistingDirectory:
         newPath = FileUtils::getExistingDirectory(this,
-                        makeDialogTitle(tr("Choose Directory")), predefined);
+                                                  makeDialogTitle(tr("Choose Directory")),
+                                                  predefined);
         break;
     case PathChooser::ExistingCommand:
     case PathChooser::Command:
         newPath = FileUtils::getOpenFilePath(this,
-                        makeDialogTitle(tr("Choose Executable")), predefined, d->m_dialogFilter);
+                                             makeDialogTitle(tr("Choose Executable")),
+                                             predefined,
+                                             d->m_dialogFilter,
+                                             nullptr,
+                                             {},
+                                             d->m_allowPathFromDevice);
         newPath = appBundleExpandedPath(newPath);
         break;
     case PathChooser::File: // fall through
         newPath = FileUtils::getOpenFilePath(this,
-                        makeDialogTitle(tr("Choose File")), predefined, d->m_dialogFilter);
+                                             makeDialogTitle(tr("Choose File")),
+                                             predefined,
+                                             d->m_dialogFilter,
+                                             nullptr,
+                                             {},
+                                             d->m_allowPathFromDevice);
         newPath = appBundleExpandedPath(newPath);
         break;
     case PathChooser::SaveFile:
         newPath = FileUtils::getSaveFilePath(this,
-                        makeDialogTitle(tr("Choose File")), predefined, d->m_dialogFilter);
+                                             makeDialogTitle(tr("Choose File")),
+                                             predefined,
+                                             d->m_dialogFilter);
         break;
     case PathChooser::Any: {
-        QFileDialog dialog(this);
-        dialog.setFileMode(QFileDialog::AnyFile);
-        dialog.setWindowTitle(makeDialogTitle(tr("Choose File")));
-        if (predefined.exists())
-            dialog.setDirectory(predefined.absolutePath().toDir());
-        // FIXME: fix QFileDialog so that it filters properly: lib*.a
-        dialog.setNameFilter(d->m_dialogFilter);
-        if (dialog.exec() == QDialog::Accepted) {
-            // probably loop here until the *.framework dir match
-            QStringList paths = dialog.selectedFiles();
-            if (!paths.isEmpty())
-                newPath = FilePath::fromString(paths.at(0));
-        }
+        newPath = FileUtils::getOpenFilePath(this,
+                                             makeDialogTitle(tr("Choose File")),
+                                             predefined,
+                                             d->m_dialogFilter,
+                                             nullptr,
+                                             {},
+                                             d->m_allowPathFromDevice);
         break;
-        }
-
+    }
     default:
         break;
     }
@@ -758,4 +766,14 @@ void PathChooser::setCommandVersionArguments(const QStringList &arguments)
     }
 }
 
+void PathChooser::setAllowPathFromDevice(bool allow)
+{
+    d->m_allowPathFromDevice = allow;
+}
+
+bool PathChooser::allowPathFromDevice() const
+{
+    return d->m_allowPathFromDevice;
+}
+
 } // namespace Utils

src/libs/utils/pathchooser.h

@@ -158,6 +158,9 @@ public:
     // setting an empty QString will disable this and clear the placeHolderText
     void setDefaultValue(const QString &defaultValue);
 
+    void setAllowPathFromDevice(bool allow);
+    bool allowPathFromDevice() const;
+
 private:
     QString rawPath() const; // The raw unexpanded input.
     bool validatePath(FancyLineEdit *edit, QString *errorMessage) const;

src/libs/utils/stringutils.cpp

@@ -28,6 +28,7 @@
 #include "algorithm.h"
 #include "hostosinfo.h"
 #include "qtcassert.h"
+#include "filepath.h"
 
 #ifdef QT_WIDGETS_LIB
 #include <QApplication>
@@ -119,6 +120,9 @@ QTCREATOR_UTILS_EXPORT QString withTildeHomePath(const QString &path)
     if (HostOsInfo::isWindowsHost())
         return path;
 
+    if (FilePath::fromString(path).needsDevice())
+        return path;
+
     static const QString homePath = QDir::homePath();
 
     QFileInfo fi(QDir::cleanPath(path));
@@ -475,7 +479,6 @@ QTCREATOR_UTILS_EXPORT QString languageNameFromLanguageCode(const QString &langu
 }
 
 #ifdef QT_WIDGETS_LIB
-
 QTCREATOR_UTILS_EXPORT void setClipboardAndSelection(const QString &text)
 {
     QClipboard *clipboard = QApplication::clipboard();
@@ -483,7 +486,14 @@ QTCREATOR_UTILS_EXPORT void setClipboardAndSelection(const QString &text)
     if (clipboard->supportsSelection())
         clipboard->setText(text, QClipboard::Selection);
 }
-
 #endif
 
+QTCREATOR_UTILS_EXPORT QString chopIfEndsWith(QString str, QChar c)
+{
+    if (str.endsWith(c))
+        str.chop(1);
+
+    return str;
+}
+
 } // namespace Utils

src/libs/utils/stringutils.h

@@ -130,4 +130,6 @@ QTCREATOR_UTILS_EXPORT void setClipboardAndSelection(const QString &text);
 
 #endif
 
+QTCREATOR_UTILS_EXPORT QString chopIfEndsWith(QString str, QChar c);
+
 } // namespace Utils

src/libs/utils/utils.qbs

@@ -33,7 +33,7 @@ Project {
             cpp.frameworks: ["Foundation", "AppKit"]
         }
 
-        Depends { name: "Qt"; submodules: ["concurrent", "network", "qml", "widgets", "xml"] }
+        Depends { name: "Qt"; submodules: ["concurrent", "core-private", "network", "qml", "widgets", "xml"] }
         Depends { name: "Qt.macextras"; condition: Qt.core.versionMajor < 6 && qbs.targetOS.contains("macos") }
         Depends { name: "app_version_header" }
 
@@ -133,6 +133,11 @@ Project {
             "fixedsizeclicklabel.h",
             "flowlayout.cpp",
             "flowlayout.h",
+            "fsengine/fileiconprovider.cpp",
+            "fsengine/fileiconprovider.h",
+            "fsengine/qtcfsengine.cpp",
+            "fsengine/qtcfsengine.h",
+            "fsengine/qtcfsengine_p.h",
             "functiontraits.h",
             "futuresynchronizer.cpp",
             "futuresynchronizer.h",

src/plugins/clangtools/clangtoolsdiagnosticmodel.cpp

@@ -30,10 +30,11 @@
 #include "clangtoolsutils.h"
 #include "diagnosticmark.h"
 
-#include <coreplugin/fileiconprovider.h>
 #include <projectexplorer/project.h>
 #include <projectexplorer/session.h>
 #include <texteditor/textmark.h>
+
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/qtcassert.h>
 #include <utils/utilsicons.h>
 
@@ -58,7 +59,7 @@ QVariant FilePathItem::data(int column, int role) const
         case Qt::DisplayRole:
             return m_filePath.toUserOutput();
         case Qt::DecorationRole:
-            return Core::FileIconProvider::icon(m_filePath);
+            return Utils::FileIconProvider::icon(m_filePath);
         case Debugger::DetailedErrorView::FullTextRole:
             return m_filePath.toUserOutput();
         default:

src/plugins/cmakeprojectmanager/cmakeprojectnodes.cpp

@@ -29,7 +29,6 @@
 #include "cmakeprojectconstants.h"
 
 #include <android/androidconstants.h>
-#include <coreplugin/fileiconprovider.h>
 #include <ios/iosconstants.h>
 #include <projectexplorer/projectexplorerconstants.h>
 #include <projectexplorer/target.h>

src/plugins/cmakeprojectmanager/cmakeprojectplugin.cpp

@@ -41,13 +41,13 @@
 
 #include <coreplugin/actionmanager/actioncontainer.h>
 #include <coreplugin/actionmanager/actionmanager.h>
-#include <coreplugin/fileiconprovider.h>
 #include <coreplugin/icore.h>
 #include <projectexplorer/projectexplorerconstants.h>
 #include <projectexplorer/projectmanager.h>
 #include <projectexplorer/projecttree.h>
 #include <texteditor/snippets/snippetprovider.h>
 
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/parameteraction.h>
 
 using namespace Core;

src/plugins/cmakeprojectmanager/projecttreehelper.cpp

@@ -25,10 +25,10 @@
 
 #include "projecttreehelper.h"
 
-#include <coreplugin/fileiconprovider.h>
 #include <projectexplorer/projectexplorerconstants.h>
 
 #include <utils/algorithm.h>
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/qtcassert.h>
 
 using namespace ProjectExplorer;

src/plugins/compilationdatabaseprojectmanager/compilationdatabaseprojectmanagerplugin.cpp

@@ -32,13 +32,13 @@
 #include <coreplugin/actionmanager/actioncontainer.h>
 #include <coreplugin/actionmanager/actionmanager.h>
 #include <coreplugin/actionmanager/command.h>
-#include <coreplugin/fileiconprovider.h>
 
 #include <projectexplorer/projectexplorerconstants.h>
 #include <projectexplorer/projectmanager.h>
 #include <projectexplorer/projecttree.h>
 #include <projectexplorer/session.h>
 
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/parameteraction.h>
 #include <utils/utilsicons.h>
 
@@ -71,9 +71,9 @@ bool CompilationDatabaseProjectManagerPlugin::initialize(const QStringList &argu
 
     d = new CompilationDatabaseProjectManagerPluginPrivate;
 
-    FileIconProvider::registerIconOverlayForFilename(Utils::Icons::PROJECT.imageFilePath().toString(),
+    Utils::FileIconProvider::registerIconOverlayForFilename(Utils::Icons::PROJECT.imageFilePath().toString(),
                                                      COMPILE_COMMANDS_JSON);
-    FileIconProvider::registerIconOverlayForFilename(
+    Utils::FileIconProvider::registerIconOverlayForFilename(
         Utils::Icons::PROJECT.imageFilePath().toString(),
         QString(COMPILE_COMMANDS_JSON) + Constants::COMPILATIONDATABASEPROJECT_FILES_SUFFIX);
 

src/plugins/coreplugin/CMakeLists.txt

@@ -59,7 +59,6 @@ add_qtc_plugin(Core
     fancyactionbar.qrc
     fancytabwidget.cpp fancytabwidget.h
     featureprovider.cpp featureprovider.h
-    fileiconprovider.cpp fileiconprovider.h
     fileutils.cpp fileutils.h
     find/basetextfind.cpp find/basetextfind.h
     find/currentdocumentfind.cpp find/currentdocumentfind.h

src/plugins/coreplugin/coreconstants.h

@@ -91,6 +91,7 @@ const char NEW[]                   = "QtCreator.New";
 const char NEW_FILE[]              = "QtCreator.NewFile";
 const char OPEN[]                  = "QtCreator.Open";
 const char OPEN_WITH[]             = "QtCreator.OpenWith";
+const char OPEN_FROM_DEVICE[]      = "QtCreator.OpenFromDevice";
 const char REVERTTOSAVED[]         = "QtCreator.RevertToSaved";
 const char SAVE[]                  = "QtCreator.Save";
 const char SAVEAS[]                = "QtCreator.SaveAs";

src/plugins/coreplugin/coreplugin.qbs

@@ -67,8 +67,6 @@ Project {
                 "fancytabwidget.h",
                 "featureprovider.cpp",
                 "featureprovider.h",
-                "fileiconprovider.cpp",
-                "fileiconprovider.h",
                 "fileutils.cpp",
                 "fileutils.h",
                 "findplaceholder.cpp",

src/plugins/coreplugin/dialogs/readonlyfilesdialog.cpp

@@ -27,7 +27,6 @@
 #include "ui_readonlyfilesdialog.h"
 
 #include <coreplugin/editormanager/editormanager_p.h>
-#include <coreplugin/fileiconprovider.h>
 #include <coreplugin/icore.h>
 #include <coreplugin/idocument.h>
 #include <coreplugin/iversioncontrol.h>
@@ -35,6 +34,7 @@
 
 #include <utils/algorithm.h>
 #include <utils/fileutils.h>
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/hostosinfo.h>
 #include <utils/stringutils.h>
 

src/plugins/coreplugin/dialogs/saveitemsdialog.cpp

@@ -26,10 +26,10 @@
 #include "saveitemsdialog.h"
 
 #include <coreplugin/diffservice.h>
-#include <coreplugin/fileiconprovider.h>
 #include <coreplugin/idocument.h>
 
 #include <utils/fileutils.h>
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/hostosinfo.h>
 
 #include <extensionsystem/pluginmanager.h>
@@ -78,7 +78,7 @@ SaveItemsDialog::SaveItemsDialog(QWidget *parent,
         QTreeWidgetItem *item = new QTreeWidgetItem(m_ui.treeWidget, QStringList()
                                                     << visibleName << QDir::toNativeSeparators(directory));
         if (!filePath.isEmpty())
-            item->setIcon(0, FileIconProvider::icon(filePath));
+            item->setIcon(0, Utils::FileIconProvider::icon(filePath));
         item->setData(0, Qt::UserRole, QVariant::fromValue(document));
     }
 

src/plugins/coreplugin/editortoolbar.cpp

@@ -31,10 +31,10 @@
 #include <coreplugin/editormanager/editormanager.h>
 #include <coreplugin/editormanager/editormanager_p.h>
 #include <coreplugin/editormanager/ieditor.h>
-#include <coreplugin/fileiconprovider.h>
 #include <coreplugin/icore.h>
 
 #include <utils/fileutils.h>
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/hostosinfo.h>
 #include <utils/qtcassert.h>
 #include <utils/utilsicons.h>
@@ -415,7 +415,7 @@ void EditorToolBar::updateDocumentStatus(IDocument *document)
     if (document->filePath().isEmpty())
         d->m_dragHandle->setIcon(QIcon());
     else
-        d->m_dragHandle->setIcon(FileIconProvider::icon(document->filePath()));
+        d->m_dragHandle->setIcon(Utils::FileIconProvider::icon(document->filePath()));
 
     d->m_editorList->setToolTip(document->filePath().isEmpty()
                                 ? document->displayName()

src/plugins/coreplugin/foldernavigationwidget.cpp

@@ -32,7 +32,6 @@
 #include <coreplugin/documentmanager.h>
 #include <coreplugin/editormanager/editormanager.h>
 #include <coreplugin/editormanager/ieditor.h>
-#include <coreplugin/fileiconprovider.h>
 #include <coreplugin/fileutils.h>
 #include <coreplugin/icontext.h>
 #include <coreplugin/icore.h>
@@ -46,6 +45,7 @@
 #include <utils/algorithm.h>
 #include <utils/filecrumblabel.h>
 #include <utils/fileutils.h>
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/hostosinfo.h>
 #include <utils/navigationtreeview.h>
 #include <utils/qtcassert.h>
@@ -158,8 +158,26 @@ public:
 
 protected:
     bool lessThan(const QModelIndex &source_left, const QModelIndex &source_right) const override;
+    bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const override;
 };
 
+bool FolderSortProxyModel::filterAcceptsRow(int source_row, const QModelIndex &source_parent) const
+{
+    if (static_cast<QFileSystemModel *>(sourceModel())->rootPath().isEmpty()) {
+        QModelIndex sourceIndex = sourceModel()->index(source_row, 0, source_parent);
+        while (sourceIndex.isValid()) {
+            if (sourceIndex.data().toString()
+                == FilePath::specialPath(FilePath::SpecialPathComponent::RootName)) {
+                return false;
+            }
+
+            sourceIndex = sourceIndex.parent();
+        }
+    }
+
+    return QSortFilterProxyModel::filterAcceptsRow(source_row, source_parent);
+}
+
 FolderSortProxyModel::FolderSortProxyModel(QObject *parent)
     : QSortFilterProxyModel(parent)
 {
@@ -281,8 +299,9 @@ FolderNavigationWidget::FolderNavigationWidget(QWidget *parent) : QWidget(parent
     m_sortProxyModel->setSourceModel(m_fileSystemModel);
     m_sortProxyModel->setSortRole(FolderNavigationModel::IsFolderRole);
     m_sortProxyModel->sort(0);
+
     m_fileSystemModel->setResolveSymlinks(false);
-    m_fileSystemModel->setIconProvider(Core::FileIconProvider::iconProvider());
+    m_fileSystemModel->setIconProvider(Utils::FileIconProvider::iconProvider());
     QDir::Filters filters = QDir::AllEntries | QDir::NoDotAndDotDot;
     if (Utils::HostOsInfo::isWindowsHost()) // Symlinked directories can cause file watcher warnings on Win32.
         filters |= QDir::NoSymLinks;
@@ -924,6 +943,17 @@ static FolderNavigationWidget *currentFolderNavigationWidget()
     return qobject_cast<FolderNavigationWidget *>(Core::ICore::currentContextWidget());
 }
 
+void FolderNavigationWidgetFactory::addRootPath(Utils::Id id, const QString &displayName, const QIcon &icon, const Utils::FilePath &path)
+{
+    if (path.isDir())
+        insertRootDirectory({id.toString(), 0, displayName, path, icon});
+}
+
+void FolderNavigationWidgetFactory::removeRootPath(Utils::Id id)
+{
+    removeRootDirectory(id.toString());
+}
+
 void FolderNavigationWidgetFactory::registerActions()
 {
     Core::Context context(C_FOLDERNAVIGATIONWIDGET);

src/plugins/coreplugin/foldernavigationwidget.h

@@ -80,6 +80,9 @@ public:
     void saveSettings(Utils::QtcSettings *settings, int position, QWidget *widget) override;
     void restoreSettings(QSettings *settings, int position, QWidget *widget) override;
 
+    void addRootPath(Utils::Id id, const QString &displayName, const QIcon &icon, const Utils::FilePath &path) override;
+    void removeRootPath(Utils::Id path) override;
+
     static void insertRootDirectory(const RootDirectory &directory);
     static void removeRootDirectory(const QString &id);
 

src/plugins/coreplugin/inavigationwidgetfactory.cpp

@@ -28,6 +28,7 @@
 
 #include "inavigationwidgetfactory.h"
 
+#include <QIcon>
 #include <QKeySequence>
 
 /*!
@@ -171,3 +172,15 @@ void INavigationWidgetFactory::saveSettings(Utils::QtcSettings * /* settings */,
 void INavigationWidgetFactory::restoreSettings(QSettings * /* settings */, int /* position */, QWidget * /* widget */)
 {
 }
+
+// Registers a new root path in the factory
+void INavigationWidgetFactory::addRootPath(Utils::Id /*id*/, const QString & /*displayName*/, const QIcon & /*icon*/, const Utils::FilePath & /*path*/)
+{
+
+}
+
+// Removes a root path from the factory
+void INavigationWidgetFactory::removeRootPath(Utils::Id /*path*/)
+{
+
+}

src/plugins/coreplugin/inavigationwidgetfactory.h

@@ -27,6 +27,7 @@
 
 #include "core_global.h"
 
+#include <utils/filepath.h>
 #include <utils/id.h>
 
 #include <QObject>
@@ -80,6 +81,9 @@ public:
     virtual void saveSettings(Utils::QtcSettings *settings, int position, QWidget *widget);
     virtual void restoreSettings(QSettings *settings, int position, QWidget *widget);
 
+    virtual void addRootPath(Utils::Id id, const QString &displayName, const QIcon &icon, const Utils::FilePath &path);
+    virtual void removeRootPath(Utils::Id id);
+
 private:
     QString m_displayName;
     int m_priority = 0;

src/plugins/coreplugin/locator/locatorwidget.cpp

@@ -33,12 +33,12 @@
 #include <coreplugin/icore.h>
 #include <coreplugin/modemanager.h>
 #include <coreplugin/actionmanager/actionmanager.h>
-#include <coreplugin/fileiconprovider.h>
 #include <coreplugin/icontext.h>
 #include <coreplugin/mainwindow.h>
 #include <utils/algorithm.h>
 #include <utils/appmainwindow.h>
 #include <utils/fancylineedit.h>
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/highlightingitemdelegate.h>
 #include <utils/hostosinfo.h>
 #include <utils/itemviews.h>

src/plugins/coreplugin/mainwindow.cpp

@@ -72,6 +72,8 @@
 #include <coreplugin/settingsdatabase.h>
 #include <extensionsystem/pluginmanager.h>
 #include <utils/algorithm.h>
+#include <utils/fsengine/fileiconprovider.h>
+#include <utils/fsengine/fsengine.h>
 #include <utils/historycompleter.h>
 #include <utils/hostosinfo.h>
 #include <utils/mimeutils.h>
@@ -83,6 +85,7 @@
 #include <utils/touchbar/touchbar.h>
 #include <utils/utilsicons.h>
 
+#include <QAbstractProxyModel>
 #include <QActionGroup>
 #include <QApplication>
 #include <QBrush>
@@ -93,11 +96,13 @@
 #include <QDialogButtonBox>
 #include <QDir>
 #include <QFileInfo>
+#include <QFileSystemModel>
 #include <QMenu>
 #include <QMenuBar>
 #include <QMessageBox>
 #include <QPrinter>
 #include <QSettings>
+#include <QSortFilterProxyModel>
 #include <QStatusBar>
 #include <QStyleFactory>
 #include <QSyntaxHighlighter>
@@ -114,6 +119,17 @@ using namespace Utils;
 namespace Core {
 namespace Internal {
 
+static const char settingsGroup[] = "MainWindow";
+static const char colorKey[] = "Color";
+static const char askBeforeExitKey[] = "AskBeforeExit";
+static const char windowGeometryKey[] = "WindowGeometry";
+static const char windowStateKey[] = "WindowState";
+static const char modeSelectorLayoutKey[] = "ModeSelectorLayout";
+static const char openFromDeviceDialogKey[] = "OpenFromDeviceDialog";
+
+static const bool askBeforeExitDefault = false;
+
+
 enum { debugMainWindow = 0 };
 
 MainWindow::MainWindow()
@@ -583,6 +599,14 @@ void MainWindow::registerDefaultActions()
     mfile->addAction(cmd, Constants::G_FILE_OPEN);
     connect(m_openWithAction, &QAction::triggered, this, &MainWindow::openFileWith);
 
+    if (FSEngine::isAvailable()) {
+        // Open From Device Action
+        m_openFromDeviceAction = new QAction(Tr::tr("Open From Device..."), this);
+        cmd = ActionManager::registerAction(m_openFromDeviceAction, Constants::OPEN_FROM_DEVICE);
+        mfile->addAction(cmd, Constants::G_FILE_OPEN);
+        connect(m_openFromDeviceAction, &QAction::triggered, this, &MainWindow::openFileFromDevice);
+    }
+
     // File->Recent Files Menu
     ActionContainer *ac = ActionManager::createMenu(Constants::M_FILE_RECENTFILES);
     mfile->addMenu(ac, Constants::G_FILE_OPEN);
@@ -1043,6 +1067,41 @@ void MainWindow::openFileWith()
     }
 }
 
+void MainWindow::openFileFromDevice()
+{
+    QSettings *settings = PluginManager::settings();
+    settings->beginGroup(QLatin1String(settingsGroup));
+    QVariant dialogSettings = settings->value(QLatin1String(openFromDeviceDialogKey));
+
+    QFileDialog dialog;
+    dialog.setOption(QFileDialog::DontUseNativeDialog);
+    if (!dialogSettings.isNull()) {
+        dialog.restoreState(dialogSettings.toByteArray());
+    }
+    QList<QUrl> sideBarUrls = Utils::transform(Utils::filtered(FSEngine::registeredDeviceRoots(),
+                                                               [](const auto &filePath) {
+                                                                   return filePath.exists();
+                                                               }),
+                                               [](const auto &filePath) {
+                                                   return QUrl::fromLocalFile(filePath.toFSPathString());
+                                               });
+    dialog.setSidebarUrls(sideBarUrls);
+    dialog.setFileMode(QFileDialog::AnyFile);
+
+    dialog.setIconProvider(FileIconProvider::iconProvider());
+
+    if (dialog.exec()) {
+        FilePaths filePaths = Utils::transform(dialog.selectedFiles(), [](const auto &path) {
+            return FilePath::fromString(path);
+        });
+
+        openFiles(filePaths, ICore::SwitchMode);
+    }
+
+    settings->setValue(QLatin1String(openFromDeviceDialogKey), dialog.saveState());
+    settings->endGroup();
+}
+
 IContext *MainWindow::contextObject(QWidget *widget) const
 {
     const auto it = m_contextWidgets.find(widget);
@@ -1126,15 +1185,6 @@ void MainWindow::aboutToShutdown()
     hide();
 }
 
-static const char settingsGroup[] = "MainWindow";
-static const char colorKey[] = "Color";
-static const char askBeforeExitKey[] = "AskBeforeExit";
-static const char windowGeometryKey[] = "WindowGeometry";
-static const char windowStateKey[] = "WindowState";
-static const char modeSelectorLayoutKey[] = "ModeSelectorLayout";
-
-static const bool askBeforeExitDefault = false;
-
 void MainWindow::readSettings()
 {
     QSettings *settings = PluginManager::settings();

src/plugins/coreplugin/mainwindow.h

@@ -116,6 +116,8 @@ public:
 
     void restart();
 
+    void openFileFromDevice();
+
 public slots:
     static void openFileWith();
     void exit();
@@ -186,6 +188,7 @@ private:
     QAction *m_newAction = nullptr;
     QAction *m_openAction = nullptr;
     QAction *m_openWithAction = nullptr;
+    QAction *m_openFromDeviceAction = nullptr;
     QAction *m_saveAllAction = nullptr;
     QAction *m_exitAction = nullptr;
     QAction *m_optionsAction = nullptr;

src/plugins/cppcheck/cppcheckdiagnosticsmodel.cpp

@@ -25,10 +25,9 @@
 
 #include "cppcheckdiagnosticsmodel.h"
 
-#include <coreplugin/fileiconprovider.h>
-
 #include <debugger/analyzer/diagnosticlocation.h>
 
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/utilsicons.h>
 
 namespace Cppcheck {
@@ -47,7 +46,7 @@ QVariant FilePathItem::data(int column, int role) const
         case Qt::DisplayRole:
             return m_filePath;
         case Qt::DecorationRole:
-            return Core::FileIconProvider::icon(Utils::FilePath::fromString(m_filePath));
+            return Utils::FileIconProvider::icon(Utils::FilePath::fromString(m_filePath));
         case Debugger::DetailedErrorView::FullTextRole:
             return m_filePath;
         default:

src/plugins/cppeditor/cppeditorplugin.cpp

@@ -83,7 +83,6 @@
 #include <coreplugin/documentmanager.h>
 #include <coreplugin/editormanager/editormanager.h>
 #include <coreplugin/editormanager/ieditorfactory.h>
-#include <coreplugin/fileiconprovider.h>
 #include <coreplugin/icore.h>
 #include <coreplugin/idocument.h>
 #include <coreplugin/navigationwidget.h>
@@ -105,6 +104,7 @@
 
 #include <utils/algorithm.h>
 #include <utils/fileutils.h>
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/hostosinfo.h>
 #include <utils/macroexpander.h>
 #include <utils/mimeutils.h>

src/plugins/cppeditor/cppincludehierarchy.cpp

@@ -35,7 +35,6 @@
 #include "cppmodelmanager.h"
 
 #include <coreplugin/editormanager/editormanager.h>
-#include <coreplugin/fileiconprovider.h>
 #include <coreplugin/find/itemviewfind.h>
 
 #include <cplusplus/CppDocument.h>
@@ -45,6 +44,7 @@
 #include <utils/delegates.h>
 #include <utils/dropsupport.h>
 #include <utils/fileutils.h>
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/navigationtreeview.h>
 #include <utils/qtcassert.h>
 #include <utils/qtcsettings.h>

src/plugins/debugger/debuggeritemmanager.cpp

@@ -318,6 +318,7 @@ DebuggerItemConfigWidget::DebuggerItemConfigWidget()
         item.reinitializeFromFile({}, errorMessage);
         return errorMessage->isEmpty();
     });
+    m_binaryChooser->setAllowPathFromDevice(true);
 
     m_workingDirectoryChooser = new PathChooser(this);
     m_workingDirectoryChooser->setExpectedKind(PathChooser::Directory);

src/plugins/designer/formeditorfactory.cpp

@@ -28,14 +28,15 @@
 #include "formwindoweditor.h"
 
 #include <coreplugin/coreconstants.h>
-#include <coreplugin/fileiconprovider.h>
 #include <projectexplorer/projectexplorerconstants.h>
+#include <utils/fsengine/fileiconprovider.h>
 
 #include <QCoreApplication>
 #include <QDebug>
 
 using namespace Core;
 using namespace Designer::Constants;
+using namespace Utils;
 
 namespace Designer {
 namespace Internal {

src/plugins/docker/dockerconstants.h

@@ -28,6 +28,7 @@
 namespace Docker::Constants {
 
 const char DOCKER[] = "docker";
+const char DOCKER_DEVICE_SCHEME[] = "docker";
 
 const char DOCKER_SETTINGS_ID[] = "Docker.Settings";
 const char DOCKER_DEVICE_TYPE[] = "DockerDeviceType";

src/plugins/docker/dockerdevice.cpp

@@ -641,6 +641,15 @@ QString DockerDevice::mapToDevicePath(const Utils::FilePath &globalPath) const
     return path;
 }
 
+Utils::FilePath DockerDevice::rootPath() const
+{
+    FilePath root;
+    root.setScheme(Constants::DOCKER_DEVICE_SCHEME);
+    root.setHost(d->m_data.repoAndTag());
+    root.setPath("/");
+    return root;
+}
+
 bool DockerDevice::handlesFile(const FilePath &filePath) const
 {
     if (filePath.scheme() == "device" && filePath.host() == id().toString())

src/plugins/docker/dockerdevice.h

@@ -81,6 +81,8 @@ public:
     Utils::FilePath mapToGlobalPath(const Utils::FilePath &pathOnDevice) const override;
     QString mapToDevicePath(const Utils::FilePath &globalPath) const override;
 
+    Utils::FilePath rootPath() const override;
+
     bool handlesFile(const Utils::FilePath &filePath) const override;
     bool isExecutableFile(const Utils::FilePath &filePath) const override;
     bool isReadableFile(const Utils::FilePath &filePath) const override;

src/plugins/docker/dockerplugin.cpp

@@ -26,11 +26,13 @@
 #include "dockerplugin.h"
 
 #include "dockerapi.h"
+#include "dockerconstants.h"
 #include "dockerdevice.h"
 #include "dockersettings.h"
 
 #include <projectexplorer/projectexplorerconstants.h>
 
+#include <utils/fsengine/fsengine.h>
 #include <utils/qtcassert.h>
 
 using namespace Core;
@@ -57,6 +59,7 @@ static DockerPlugin *s_instance = nullptr;
 DockerPlugin::DockerPlugin()
 {
     s_instance = this;
+    FSEngine::registerDeviceScheme(Constants::DOCKER_DEVICE_SCHEME);
 }
 
 DockerApi *DockerPlugin::dockerApi()
@@ -67,6 +70,7 @@ DockerApi *DockerPlugin::dockerApi()
 
 DockerPlugin::~DockerPlugin()
 {
+    FSEngine::unregisterDeviceScheme(Constants::DOCKER_DEVICE_SCHEME);
     s_instance = nullptr;
     delete d;
 }

src/plugins/glsleditor/glsleditorplugin.cpp

@@ -38,9 +38,10 @@
 #include <coreplugin/actionmanager/command.h>
 #include <coreplugin/coreconstants.h>
 #include <coreplugin/editormanager/editormanager.h>
-#include <coreplugin/fileiconprovider.h>
 #include <coreplugin/icore.h>
 
+#include <utils/fsengine/fileiconprovider.h>
+
 #include <QMenu>
 
 using namespace Core;

src/plugins/mesonprojectmanager/mesonprojectplugin.cpp

@@ -37,13 +37,14 @@
 #include "settings/tools/toolssettingsaccessor.h"
 #include "settings/tools/toolssettingspage.h"
 
-#include <coreplugin/fileiconprovider.h>
 #include <coreplugin/icore.h>
 
 #include <projectexplorer/projectexplorerconstants.h>
 #include <projectexplorer/projectmanager.h>
 #include <projectexplorer/runcontrol.h>
 
+#include <utils/fsengine/fileiconprovider.h>
+
 using namespace Core;
 using namespace ProjectExplorer;
 using namespace Utils;

src/plugins/mesonprojectmanager/project/projecttree/mesonprojectnodes.h

@@ -25,11 +25,10 @@
 
 #pragma once
 
-#include <coreplugin/fileiconprovider.h>
-
 #include <projectexplorer/projectnodes.h>
 
 #include <utils/fileutils.h>
+#include <utils/fsengine/fileiconprovider.h>
 
 namespace MesonProjectManager {
 namespace Internal {

src/plugins/nim/nimplugin.cpp

@@ -43,8 +43,6 @@
 #include "settings/nimsettings.h"
 #include "suggest/nimsuggestcache.h"
 
-#include <coreplugin/fileiconprovider.h>
-
 #include <projectexplorer/projectexplorerconstants.h>
 #include <projectexplorer/projectmanager.h>
 #include <projectexplorer/runcontrol.h>
@@ -53,6 +51,8 @@
 
 #include <texteditor/snippets/snippetprovider.h>
 
+#include <utils/fsengine/fileiconprovider.h>
+
 using namespace Utils;
 using namespace ProjectExplorer;
 
@@ -128,13 +128,13 @@ bool NimPlugin::initialize(const QStringList &arguments, QString *errorMessage)
 void NimPlugin::extensionsInitialized()
 {
     // Add MIME overlay icons (these icons displayed at Project dock panel)
-    const QIcon icon = Utils::Icon({{":/nim/images/settingscategory_nim.png",
-            Utils::Theme::PanelTextColorDark
-        }}, Utils::Icon::Tint).icon();
+    const QIcon icon = Icon({{":/nim/images/settingscategory_nim.png",
+            Theme::PanelTextColorDark
+        }}, Icon::Tint).icon();
     if (!icon.isNull()) {
-        Core::FileIconProvider::registerIconOverlayForMimeType(icon, Constants::C_NIM_MIMETYPE);
-        Core::FileIconProvider::registerIconOverlayForMimeType(icon, Constants::C_NIM_SCRIPT_MIMETYPE);
-        Core::FileIconProvider::registerIconOverlayForMimeType(icon, Constants::C_NIMBLE_MIMETYPE);
+        FileIconProvider::registerIconOverlayForMimeType(icon, Constants::C_NIM_MIMETYPE);
+        FileIconProvider::registerIconOverlayForMimeType(icon, Constants::C_NIM_SCRIPT_MIMETYPE);
+        FileIconProvider::registerIconOverlayForMimeType(icon, Constants::C_NIMBLE_MIMETYPE);
     }
     TaskHub::addCategory(Constants::C_NIMPARSE_ID, "Nim");
 }

src/plugins/projectexplorer/dependenciespanel.cpp

@@ -27,11 +27,11 @@
 #include "project.h"
 #include "session.h"
 
-#include <coreplugin/fileiconprovider.h>
 #include <coreplugin/icore.h>
 
-#include <utils/detailswidget.h>
 #include <utils/algorithm.h>
+#include <utils/detailswidget.h>
+#include <utils/fsengine/fileiconprovider.h>
 
 #include <QDebug>
 #include <QSize>
@@ -99,7 +99,7 @@ QVariant DependenciesModel::data(const QModelIndex &index, int role) const
     case Qt::CheckStateRole:
         return SessionManager::hasDependency(m_project, p) ? Qt::Checked : Qt::Unchecked;
     case Qt::DecorationRole:
-        return Core::FileIconProvider::icon(p->projectFilePath());
+        return Utils::FileIconProvider::icon(p->projectFilePath());
     default:
         return QVariant();
     }

src/plugins/projectexplorer/devicesupport/devicemanager.cpp

@@ -34,6 +34,7 @@
 #include <utils/algorithm.h>
 #include <utils/environment.h>
 #include <utils/fileutils.h>
+#include <utils/fsengine/fsengine.h>
 #include <utils/persistentsettings.h>
 #include <utils/portlist.h>
 #include <utils/qtcassert.h>
@@ -304,6 +305,10 @@ void DeviceManager::addDevice(const IDevice::ConstPtr &_device)
             d->devices << device;
         }
         emit deviceAdded(device->id());
+
+        if (FSEngine::isAvailable()) {
+            Utils::FSEngine::addDevice(device->rootPath());
+        }
     }
 
     emit updated();
@@ -323,6 +328,10 @@ void DeviceManager::removeDevice(Utils::Id id)
     }
     emit deviceRemoved(device->id());
 
+    if (FSEngine::isAvailable()) {
+        Utils::FSEngine::removeDevice(device->rootPath());
+    }
+
     if (wasDefault) {
         for (int i = 0; i < d->devices.count(); ++i) {
             if (deviceAt(i)->type() == deviceType) {

src/plugins/projectexplorer/devicesupport/idevice.h

@@ -205,7 +205,7 @@ public:
     MachineType machineType() const;
     void setMachineType(MachineType machineType);
 
-    Utils::FilePath rootPath() const;
+    virtual Utils::FilePath rootPath() const;
     Utils::FilePath filePath(const QString &pathOnDevice) const;
 
     Utils::FilePath debugServerPath() const;

src/plugins/projectexplorer/gcctoolchain.cpp

@@ -1341,6 +1341,7 @@ GccToolChainConfigWidget::GccToolChainConfigWidget(GccToolChain *tc) :
     m_compilerCommand->setExpectedKind(PathChooser::ExistingCommand);
     m_compilerCommand->setCommandVersionArguments(gnuVersionArgs);
     m_compilerCommand->setHistoryCompleter("PE.Gcc.Command.History");
+    m_compilerCommand->setAllowPathFromDevice(true);
     m_mainLayout->addRow(tr("&Compiler path:"), m_compilerCommand);
     m_platformCodeGenFlagsLineEdit = new QLineEdit(this);
     m_platformCodeGenFlagsLineEdit->setText(ProcessArgs::joinArgs(tc->platformCodeGenFlags()));

src/plugins/projectexplorer/projectmodels.cpp

@@ -35,13 +35,13 @@
 
 #include <app/app_version.h>
 #include <coreplugin/documentmanager.h>
-#include <coreplugin/fileiconprovider.h>
 #include <coreplugin/icore.h>
 #include <coreplugin/iversioncontrol.h>
 #include <coreplugin/vcsmanager.h>
 #include <utils/utilsicons.h>
 #include <utils/algorithm.h>
 #include <utils/dropsupport.h>
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/pathchooser.h>
 #include <utils/stringutils.h>
 #include <utils/theme/theme.h>

src/plugins/projectexplorer/projectnodes.cpp

@@ -32,12 +32,12 @@
 #include "projecttree.h"
 #include "target.h"
 
-#include <coreplugin/fileiconprovider.h>
 #include <coreplugin/icore.h>
 #include <coreplugin/iversioncontrol.h>
 #include <coreplugin/vcsmanager.h>
 
 #include <utils/fileutils.h>
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/hostosinfo.h>
 #include <utils/mimeutils.h>
 #include <utils/pointeralgorithm.h>
@@ -257,7 +257,7 @@ QIcon FileNode::icon() const
     if (hasError())
         return Utils::Icons::WARNING.icon();
     if (m_icon.isNull())
-        m_icon = Core::FileIconProvider::icon(filePath());
+        m_icon = Utils::FileIconProvider::icon(filePath());
     return m_icon;
 }
 
@@ -479,7 +479,7 @@ QIcon FolderNode::icon() const
     } else {
         auto iconPtr = Utils::get_if<QIcon>(&m_icon);
         if (!iconPtr || iconPtr->isNull())
-            m_icon = Core::FileIconProvider::icon(QFileIconProvider::Folder);
+            m_icon = Utils::FileIconProvider::icon(QFileIconProvider::Folder);
     }
     return Utils::get<QIcon>(m_icon);
 }
@@ -1089,7 +1089,7 @@ QIcon DirectoryIcon::icon() const
     const auto it = m_cache.find(m_overlay);
     if (it != m_cache.end())
         return it.value();
-    const QIcon icon = Core::FileIconProvider::directoryIcon(m_overlay);
+    const QIcon icon = Utils::FileIconProvider::directoryIcon(m_overlay);
     m_cache.insert(m_overlay, icon);
     return icon;
 }

src/plugins/projectexplorer/runcontrol.cpp

@@ -514,24 +514,22 @@ void RunControl::initiateFinish()
 
 RunWorker *RunControl::createWorker(Utils::Id workerId)
 {
-    const auto check = std::bind(&RunWorkerFactory::canRun,
-                                 std::placeholders::_1,
-                                 workerId,
-                                 DeviceTypeKitAspect::deviceTypeId(d->kit),
-                                 QString{});
-    RunWorkerFactory *factory = Utils::findOrDefault(g_runWorkerFactories, check);
+    RunWorkerFactory *factory
+        = Utils::findOrDefault(g_runWorkerFactories, [this, workerId](RunWorkerFactory *factory) {
+              return factory->canRun(workerId, DeviceTypeKitAspect::deviceTypeId(d->kit), QString{});
+          });
     return factory ? factory->producer()(this) : nullptr;
 }
 
 bool RunControl::createMainWorker()
 {
-    const auto canRun = std::bind(&RunWorkerFactory::canRun,
-                                  std::placeholders::_1,
-                                  d->runMode,
-                                  DeviceTypeKitAspect::deviceTypeId(d->kit),
-                                  d->runConfigId.toString());
+    const QList<RunWorkerFactory *> candidates
+        = Utils::filtered(g_runWorkerFactories, [this](RunWorkerFactory *factory) {
+              return factory->canRun(d->runMode,
+                                     DeviceTypeKitAspect::deviceTypeId(d->kit),
+                                     d->runConfigId.toString());
+          });
 
-    const QList<RunWorkerFactory *> candidates = Utils::filtered(g_runWorkerFactories, canRun);
     // There might be combinations that cannot run. But that should have been checked
     // with canRun below.
     QTC_ASSERT(!candidates.empty(), return false);

src/plugins/projectexplorer/selectablefilesmodel.cpp

@@ -26,11 +26,11 @@
 #include "selectablefilesmodel.h"
 #include "projectexplorerconstants.h"
 
-#include <coreplugin/fileiconprovider.h>
 #include <coreplugin/icore.h>
 
 #include <utils/algorithm.h>
 #include <utils/fancylineedit.h>
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/pathchooser.h>
 #include <utils/runextensions.h>
 #include <utils/stringutils.h>
@@ -231,7 +231,7 @@ QVariant SelectableFilesModel::data(const QModelIndex &index, int role) const
         return t->checked;
     if (role == Qt::DecorationRole) {
         if (t->icon.isNull())
-            t->icon = Core::FileIconProvider::icon(t->fullPath);
+            t->icon = Utils::FileIconProvider::icon(t->fullPath);
         return t->icon;
     }
     return QVariant();

src/plugins/python/pythonplugin.cpp

@@ -31,8 +31,6 @@
 #include "pythonsettings.h"
 #include "pythonrunconfiguration.h"
 
-#include <coreplugin/fileiconprovider.h>
-
 #include <projectexplorer/buildtargetinfo.h>
 #include <projectexplorer/localenvironmentaspect.h>
 #include <projectexplorer/projectexplorerconstants.h>
@@ -40,6 +38,7 @@
 #include <projectexplorer/runcontrol.h>
 #include <projectexplorer/taskhub.h>
 
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/theme/theme.h>
 
 using namespace ProjectExplorer;
@@ -100,7 +99,7 @@ void PythonPlugin::extensionsInitialized()
     // Add MIME overlay icons (these icons displayed at Project dock panel)
     QString imageFile = Utils::creatorTheme()->imageFile(Utils::Theme::IconOverlayPro,
                                                          ::Constants::FILEOVERLAY_PY);
-    Core::FileIconProvider::registerIconOverlayForSuffix(imageFile, "py");
+    Utils::FileIconProvider::registerIconOverlayForSuffix(imageFile, "py");
 
     TaskHub::addCategory(PythonErrorTaskCategory, "Python", true);
 }

src/plugins/qbsprojectmanager/qbsnodes.cpp

@@ -32,13 +32,14 @@
 #include "qbssession.h"
 
 #include <android/androidconstants.h>
-#include <coreplugin/fileiconprovider.h>
 #include <coreplugin/idocument.h>
 #include <projectexplorer/projectexplorerconstants.h>
 #include <projectexplorer/target.h>
 #include <qtsupport/qtsupportconstants.h>
 #include <resourceeditor/resourcenode.h>
+
 #include <utils/algorithm.h>
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/hostosinfo.h>
 #include <utils/qtcassert.h>
 

src/plugins/qbsprojectmanager/qbsprojectmanagerplugin.cpp

@@ -46,7 +46,6 @@
 #include <coreplugin/helpmanager.h>
 #include <coreplugin/icore.h>
 #include <coreplugin/idocument.h>
-#include <coreplugin/fileiconprovider.h>
 
 #include <projectexplorer/buildmanager.h>
 #include <projectexplorer/project.h>
@@ -63,6 +62,7 @@
 #include <qmljstools/qmljstoolsconstants.h>
 
 #include <utils/fileutils.h>
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/qtcassert.h>
 #include <utils/utilsicons.h>
 
@@ -112,7 +112,7 @@ bool QbsProjectManagerPlugin::initialize(const QStringList &arguments, QString *
 
     const Core::Context projectContext(::QbsProjectManager::Constants::PROJECT_ID);
 
-    Core::FileIconProvider::registerIconOverlayForSuffix(ProjectExplorer::Constants::FILEOVERLAY_QT, "qbs");
+    Utils::FileIconProvider::registerIconOverlayForSuffix(ProjectExplorer::Constants::FILEOVERLAY_QT, "qbs");
     Core::HelpManager::registerDocumentation({Core::HelpManager::documentationPath() + "/qbs.qch"});
 
     ProjectManager::registerProjectType<QbsProject>(QmlJSTools::Constants::QBS_MIMETYPE);

src/plugins/qmakeprojectmanager/profileeditor.cpp

@@ -32,7 +32,6 @@
 #include "qmakeproject.h"
 #include "qmakeprojectmanagerconstants.h"
 
-#include <coreplugin/fileiconprovider.h>
 #include <extensionsystem/pluginmanager.h>
 #include <qtsupport/qtsupportconstants.h>
 #include <projectexplorer/buildconfiguration.h>
@@ -41,6 +40,7 @@
 #include <projectexplorer/session.h>
 #include <texteditor/texteditoractionhandler.h>
 #include <texteditor/textdocument.h>
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/qtcassert.h>
 #include <utils/theme/theme.h>
 
@@ -298,11 +298,11 @@ ProFileEditorFactory::ProFileEditorFactory()
     setSyntaxHighlighterCreator([]() { return new ProFileHighlighter; });
 
     const QString defaultOverlay = QLatin1String(ProjectExplorer::Constants::FILEOVERLAY_QT);
-    Core::FileIconProvider::registerIconOverlayForSuffix(
+    Utils::FileIconProvider::registerIconOverlayForSuffix(
                 creatorTheme()->imageFile(Theme::IconOverlayPro, defaultOverlay), "pro");
-    Core::FileIconProvider::registerIconOverlayForSuffix(
+    Utils::FileIconProvider::registerIconOverlayForSuffix(
                 creatorTheme()->imageFile(Theme::IconOverlayPri, defaultOverlay), "pri");
-    Core::FileIconProvider::registerIconOverlayForSuffix(
+    Utils::FileIconProvider::registerIconOverlayForSuffix(
                 creatorTheme()->imageFile(Theme::IconOverlayPrf, defaultOverlay), "prf");
 }
 

src/plugins/qmakeprojectmanager/qmakenodetreebuilder.cpp

@@ -27,7 +27,6 @@
 
 #include "qmakeproject.h"
 
-#include <coreplugin/fileiconprovider.h>
 #include <projectexplorer/projectexplorerconstants.h>
 #include <projectexplorer/target.h>
 #include <qtsupport/baseqtversion.h>
@@ -35,6 +34,7 @@
 #include <resourceeditor/resourcenode.h>
 
 #include <utils/algorithm.h>
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/qtcassert.h>
 
 using namespace Core;
@@ -112,12 +112,12 @@ QmakeStaticData::QmakeStaticData()
         const QString filter = QString::fromUtf8(fileType.addFileFilter);
         fileTypeData.push_back(QmakeStaticData::FileTypeData(fileType.type,
                                                              desc, filter,
-                                                             Core::FileIconProvider::directoryIcon(QLatin1String(fileType.icon))));
+                                                             Utils::FileIconProvider::directoryIcon(QLatin1String(fileType.icon))));
     }
     // Project icon
-    projectIcon = Core::FileIconProvider::directoryIcon(ProjectExplorer::Constants::FILEOVERLAY_QT);
-    productIcon = Core::FileIconProvider::directoryIcon(ProjectExplorer::Constants::FILEOVERLAY_PRODUCT);
-    groupIcon = Core::FileIconProvider::directoryIcon(ProjectExplorer::Constants::FILEOVERLAY_GROUP);
+    projectIcon = Utils::FileIconProvider::directoryIcon(ProjectExplorer::Constants::FILEOVERLAY_QT);
+    productIcon = Utils::FileIconProvider::directoryIcon(ProjectExplorer::Constants::FILEOVERLAY_PRODUCT);
+    groupIcon = Utils::FileIconProvider::directoryIcon(ProjectExplorer::Constants::FILEOVERLAY_GROUP);
 
     qAddPostRoutine(clearQmakeStaticData);
 }

src/plugins/qmljseditor/qmljseditorplugin.cpp

@@ -43,7 +43,6 @@
 
 #include <coreplugin/coreconstants.h>
 #include <coreplugin/icore.h>
-#include <coreplugin/fileiconprovider.h>
 #include <coreplugin/actionmanager/actionmanager.h>
 #include <coreplugin/actionmanager/actioncontainer.h>
 #include <coreplugin/actionmanager/command.h>
@@ -55,6 +54,7 @@
 #include <texteditor/snippets/snippetprovider.h>
 #include <texteditor/texteditorconstants.h>
 #include <texteditor/tabsettings.h>
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/qtcassert.h>
 #include <utils/json.h>
 

src/plugins/qmlprojectmanager/qmlprojectnodes.cpp

@@ -25,7 +25,7 @@
 
 #include "qmlprojectnodes.h"
 
-#include <coreplugin/fileiconprovider.h>
+#include <utils/fsengine/fileiconprovider.h>
 
 #include <projectexplorer/project.h>
 #include <projectexplorer/projectexplorer.h>

src/plugins/qmlprojectmanager/qmlprojectplugin.cpp

@@ -38,7 +38,6 @@
 #include <coreplugin/coreconstants.h>
 #include <coreplugin/designmode.h>
 #include <coreplugin/editormanager/editormanager.h>
-#include <coreplugin/fileiconprovider.h>
 #include <coreplugin/icore.h>
 #include <coreplugin/messagebox.h>
 #include <coreplugin/modemanager.h>
@@ -62,6 +61,7 @@
 #include <extensionsystem/pluginspec.h>
 
 #include <utils/fileutils.h>
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/qtcprocess.h>
 
 #include <QAction>
@@ -286,7 +286,7 @@ bool QmlProjectPlugin::initialize(const QStringList &, QString *errorMessage)
     }
 
     ProjectManager::registerProjectType<QmlProject>(QmlJSTools::Constants::QMLPROJECT_MIMETYPE);
-    Core::FileIconProvider::registerIconOverlayForSuffix(":/qmlproject/images/qmlproject.png",
+    Utils::FileIconProvider::registerIconOverlayForSuffix(":/qmlproject/images/qmlproject.png",
                                                          "qmlproject");
 
     if (QmlProject::isQtDesignStudio()) {

src/plugins/qtsupport/qtoptionspage.cpp

@@ -60,6 +60,7 @@
 #include <QDialogButtonBox>
 #include <QDir>
 #include <QFormLayout>
+#include <QGuiApplication>
 #include <QHeaderView>
 #include <QLabel>
 #include <QMessageBox>
@@ -644,12 +645,15 @@ QtOptionsPageWidget::~QtOptionsPageWidget()
 
 void QtOptionsPageWidget::addQtDir()
 {
-    FilePath qtVersion = FileUtils::getOpenFilePath(this,
-                                                    tr("Select a qmake Executable"),
-                                                    {},
-                                                    BuildableHelperLibrary::filterForQmakeFileDialog(),
-                                                    0,
-                                                    QFileDialog::DontResolveSymlinks);
+    FilePath qtVersion
+        = FileUtils::getOpenFilePath(this,
+                                     tr("Select a qmake Executable"),
+                                     {},
+                                     BuildableHelperLibrary::filterForQmakeFileDialog(),
+                                     nullptr,
+                                     QFileDialog::DontResolveSymlinks,
+                                     true);
+
     if (qtVersion.isEmpty())
         return;
 
@@ -1025,6 +1029,7 @@ void QtOptionsPageWidget::linkWithQt()
     });
     const Utils::optional<FilePath> currentLink = currentlyLinkedQtDir(nullptr);
     pathInput->setFilePath(currentLink ? *currentLink : defaultQtInstallationPath());
+    pathInput->setAllowPathFromDevice(true);
     auto buttons = new QDialogButtonBox;
     layout->addStretch(10);
     layout->addWidget(buttons);

src/plugins/remotelinux/linuxdevice.cpp

@@ -1046,6 +1046,15 @@ QString LinuxDevice::userAtHost() const
     return sshParameters().userAtHost();
 }
 
+Utils::FilePath LinuxDevice::rootPath() const
+{
+    Utils::FilePath root;
+    root.setScheme("ssh");
+    root.setHost(userAtHost());
+    root.setPath("/");
+    return root;
+}
+
 bool LinuxDevice::handlesFile(const FilePath &filePath) const
 {
     if (filePath.scheme() == "device" && filePath.host() == id().toString())

src/plugins/remotelinux/linuxdevice.h

@@ -57,6 +57,8 @@ public:
 
     QString userAtHost() const;
 
+    Utils::FilePath rootPath() const override;
+
     bool handlesFile(const Utils::FilePath &filePath) const override;
     bool isExecutableFile(const Utils::FilePath &filePath) const override;
     bool isReadableFile(const Utils::FilePath &filePath) const override;

src/plugins/remotelinux/remotelinuxplugin.cpp

@@ -49,7 +49,10 @@
 #include <projectexplorer/projectexplorerconstants.h>
 #include <projectexplorer/target.h>
 
+#include <utils/fsengine/fsengine.h>
+
 using namespace ProjectExplorer;
+using namespace Utils;
 
 namespace RemoteLinux {
 namespace Internal {
@@ -114,10 +117,12 @@ static RemoteLinuxPluginPrivate *dd = nullptr;
 RemoteLinuxPlugin::RemoteLinuxPlugin()
 {
     setObjectName(QLatin1String("RemoteLinuxPlugin"));
+    FSEngine::registerDeviceScheme("ssh");
 }
 
 RemoteLinuxPlugin::~RemoteLinuxPlugin()
 {
+    FSEngine::unregisterDeviceScheme("ssh");
     delete dd;
 }
 

src/plugins/resourceeditor/qrceditor/resourcefile.cpp

@@ -25,7 +25,6 @@
 
 #include "resourcefile_p.h"
 
-#include <coreplugin/fileiconprovider.h>
 #include <coreplugin/fileutils.h>
 #include <coreplugin/icore.h>
 #include <coreplugin/vcsmanager.h>
@@ -33,6 +32,7 @@
 
 #include <utils/algorithm.h>
 #include <utils/filepath.h>
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/removefiledialog.h>
 #include <utils/theme/theme.h>
 
@@ -580,7 +580,7 @@ void ResourceFile::clearPrefixList()
 ResourceModel::ResourceModel(QObject *parent)
     : QAbstractItemModel(parent), m_dirty(false)
 {
-    static QIcon resourceFolderIcon = Core::FileIconProvider::directoryIcon(QLatin1String(ProjectExplorer::Constants::FILEOVERLAY_QRC));
+    static QIcon resourceFolderIcon = Utils::FileIconProvider::directoryIcon(QLatin1String(ProjectExplorer::Constants::FILEOVERLAY_QRC));
     m_prefixIcon = resourceFolderIcon;
 }
 
@@ -797,7 +797,7 @@ QVariant ResourceModel::data(const QModelIndex &index, int role) const
                 if (iconFileExtension(path))
                     file->icon = QIcon(path);
                 else
-                    file->icon = Core::FileIconProvider::icon(Utils::FilePath::fromString(path));
+                    file->icon = Utils::FileIconProvider::icon(Utils::FilePath::fromString(path));
             }
             if (!file->icon.isNull())
                 result = file->icon;

src/plugins/resourceeditor/resourceeditorfactory.cpp

@@ -28,9 +28,9 @@
 #include "resourceeditorplugin.h"
 #include "resourceeditorconstants.h"
 
-#include <coreplugin/fileiconprovider.h>
 #include <coreplugin/editormanager/editormanager.h>
 #include <projectexplorer/projectexplorerconstants.h>
+#include <utils/fsengine/fileiconprovider.h>
 
 #include <QCoreApplication>
 #include <QFileInfo>
@@ -45,7 +45,7 @@ ResourceEditorFactory::ResourceEditorFactory(ResourceEditorPlugin *plugin)
     setMimeTypes(QStringList(QLatin1String(C_RESOURCE_MIMETYPE)));
     setDisplayName(QCoreApplication::translate("OpenWith::Editors", C_RESOURCEEDITOR_DISPLAY_NAME));
 
-    Core::FileIconProvider::registerIconOverlayForSuffix(
+    Utils::FileIconProvider::registerIconOverlayForSuffix(
                 ProjectExplorer::Constants::FILEOVERLAY_QRC, "qrc");
 
     setEditorCreator([plugin] {

src/plugins/resourceeditor/resourcenode.cpp

@@ -28,12 +28,12 @@
 #include "qrceditor/resourcefile_p.h"
 
 #include <coreplugin/documentmanager.h>
-#include <coreplugin/fileiconprovider.h>
 
 #include <qmljstools/qmljstoolsconstants.h>
 
 #include <utils/algorithm.h>
 #include <utils/fileutils.h>
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/mimeutils.h>
 #include <utils/qtcassert.h>
 #include <utils/threadutils.h>

src/plugins/scxmleditor/scxmleditorfactory.cpp

@@ -29,8 +29,8 @@
 #include "scxmleditordata.h"
 
 #include <coreplugin/editormanager/editormanager.h>
-#include <coreplugin/fileiconprovider.h>
 #include <projectexplorer/projectexplorerconstants.h>
+#include <utils/fsengine/fileiconprovider.h>
 
 #include <QGuiApplication>
 #include <QFileInfo>
@@ -44,7 +44,7 @@ ScxmlEditorFactory::ScxmlEditorFactory()
     setDisplayName(QCoreApplication::translate("ScxmlEditor", C_SCXMLEDITOR_DISPLAY_NAME));
     addMimeType(ProjectExplorer::Constants::SCXML_MIMETYPE);
 
-    Core::FileIconProvider::registerIconOverlayForSuffix(":/projectexplorer/images/fileoverlay_scxml.png", "scxml");
+    Utils::FileIconProvider::registerIconOverlayForSuffix(":/projectexplorer/images/fileoverlay_scxml.png", "scxml");
 
     setEditorCreator([this] {
         if (!m_editorData) {

src/plugins/vcsbase/submitfilemodel.cpp

@@ -25,8 +25,8 @@
 
 #include "submitfilemodel.h"
 
-#include <coreplugin/fileiconprovider.h>
 #include <utils/fileutils.h>
+#include <utils/fsengine/fileiconprovider.h>
 #include <utils/qtcassert.h>
 #include <utils/theme/theme.h>
 
@@ -88,8 +88,8 @@ static QList<QStandardItem *> createFileRow(const QString &repositoryRoot,
     fileItem->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEnabled);
     // For some reason, Windows (at least) requires a valid (existing) file path to the icon, so
     // the repository root is needed here.
-    // Note: for "overlaid" icons in Core::FileIconProvider a valid file path is not required
-    fileItem->setIcon(Core::FileIconProvider::icon(
+    // Note: for "overlaid" icons in Utils::FileIconProvider a valid file path is not required
+    fileItem->setIcon(Utils::FileIconProvider::icon(
         Utils::FilePath::fromString(repositoryRoot).pathAppended(fileName)));
     const QList<QStandardItem *> row{statusItem, fileItem};
     if (statusHint != SubmitFileModel::FileStatusUnknown) {

tests/auto/filesystemmodel/CMakeLists.txt

@@ -0,0 +1,4 @@
+add_qtc_test(tst_filesystemmodel
+  DEPENDS Utils
+  SOURCES tst_filesystemmodel.cpp ../../../src/shared/modeltest/modeltest.cpp
+)

tests/auto/filesystemmodel/tst_filesystemmodel.cpp

@@ -0,0 +1,75 @@
+
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#include "../../../src/shared/modeltest/modeltest.h"
+
+#include <utils/filesystemmodel/filesystemmodel.h>
+
+#include <QCoreApplication>
+#include <QDebug>
+#include <QLocalSocket>
+#include <QNetworkAccessManager>
+#include <QProcess>
+#include <QtTest>
+
+#ifndef WITH_TESTS
+#define WITH_TESTS
+#endif
+
+class FileSystemModelTest : public ModelTest
+{
+    Q_OBJECT
+
+public:
+    FileSystemModelTest()
+        : ModelTest(new Utils::FileSystemModel())
+    {
+        static_cast<Utils::FileSystemModel*>(this->model())->setRootPath("/");
+    }
+
+private slots:
+    void qTestWithTestClass() {
+        Utils::FileSystemModel modelToBeTested;
+        modelToBeTested.setRootPath("/");
+        auto tester = new QAbstractItemModelTester(&modelToBeTested);
+    }
+
+    void testWithSortFilterProxyModel() {
+        Utils::FileSystemModel modelToBeTested;
+        QSortFilterProxyModel proxyModel;
+
+        proxyModel.setSourceModel(&modelToBeTested);
+        proxyModel.setSortRole(Qt::UserRole + 50);
+        proxyModel.sort(0);
+
+        modelToBeTested.setRootPath("/");
+        auto tester = new QAbstractItemModelTester(&proxyModel);
+    }
+};
+
+QTEST_MAIN(FileSystemModelTest)
+
+#include "tst_filesystemmodel.moc"

tests/auto/utils/CMakeLists.txt

@@ -10,3 +10,4 @@ add_subdirectory(templateengine)
 add_subdirectory(treemodel)
 add_subdirectory(multicursor)
 add_subdirectory(deviceshell)
+add_subdirectory(fsengine)

tests/auto/utils/fileutils/tst_fileutils.cpp

@@ -56,6 +56,10 @@ private slots:
     void relativePath();
     void fromToString_data();
     void fromToString();
+    void fromString_data();
+    void fromString();
+    void toString_data();
+    void toString();
     void comparison_data();
     void comparison();
     void linkFromString_data();
@@ -281,6 +285,83 @@ void tst_fileutils::relativePath()
     QCOMPARE(actualPath.toString(), result);
 }
 
+void tst_fileutils::toString_data()
+{
+    QTest::addColumn<QString>("scheme");
+    QTest::addColumn<QString>("host");
+    QTest::addColumn<QString>("path");
+    QTest::addColumn<QString>("result");
+    QTest::addColumn<QString>("userResult");
+
+    QTest::newRow("empty") << "" << "" << "" << "" << "";
+    QTest::newRow("scheme") << "http" << "" << "" << QDir::rootPath() + "__qtc_devices__/http//./" << "http:///./";
+    QTest::newRow("scheme-and-host") << "http" << "127.0.0.1" << "" << QDir::rootPath() + "__qtc_devices__/http/127.0.0.1/./" << "http://127.0.0.1/./";
+    QTest::newRow("root") << "http" << "127.0.0.1" << "/" << QDir::rootPath() + "__qtc_devices__/http/127.0.0.1/" << "http://127.0.0.1/";
+
+    QTest::newRow("root-folder") << "" << "" << "/" << "/" << "/";
+    QTest::newRow("qtc-dev-root-folder") << "" << "" << QDir::rootPath() + "__qtc_devices__" << QDir::rootPath() + "__qtc_devices__" << QDir::rootPath() + "__qtc_devices__";
+    QTest::newRow("qtc-dev-type-root-folder") << "" << "" << QDir::rootPath() + "__qtc_devices__/docker" << QDir::rootPath() + "__qtc_devices__/docker" << QDir::rootPath() + "__qtc_devices__/docker";
+    QTest::newRow("qtc-root-folder") << "docker" << "alpine:latest" << "/" << QDir::rootPath() + "__qtc_devices__/docker/alpine:latest/" << "docker://alpine:latest/";
+    QTest::newRow("qtc-root-folder-rel") << "docker" << "alpine:latest" << "" << QDir::rootPath() + "__qtc_devices__/docker/alpine:latest/./" << "docker://alpine:latest/./";
+}
+
+void tst_fileutils::toString()
+{
+    QFETCH(QString, scheme);
+    QFETCH(QString, host);
+    QFETCH(QString, path);
+    QFETCH(QString, result);
+    QFETCH(QString, userResult);
+
+    FilePath filePath;
+    filePath.setScheme(scheme);
+    filePath.setHost(host);
+    filePath.setPath(path);
+
+    QCOMPARE(filePath.toString(), result);
+    QCOMPARE(filePath.toUserOutput(), userResult);
+}
+
+void tst_fileutils::fromString_data()
+{
+    QTest::addColumn<QString>("input");
+
+    QTest::addColumn<QString>("scheme");
+    QTest::addColumn<QString>("host");
+    QTest::addColumn<QString>("path");
+
+    QTest::newRow("empty") << "" << "" << "" << "";
+
+    QTest::newRow("unix-root") << "/" << "" << "" << "/";
+    QTest::newRow("unix-folder") << "/tmp" << "" << "" << "/tmp";
+    QTest::newRow("unix-folder-with-trailing-slash") << "/tmp/" << "" << "" << "/tmp/";
+
+    QTest::newRow("windows-root") << "c:" << "" << "" << "c:";
+    QTest::newRow("windows-folder") << "c:\\Windows" << "" << "" << "c:\\Windows";
+    QTest::newRow("windows-folder-with-trailing-slash") << "c:\\Windows\\" << "" << "" << "c:\\Windows\\";
+    QTest::newRow("windows-folder-slash") << "C:/Windows" << "" << "" << "C:/Windows";
+
+    QTest::newRow("docker-root-url") << "docker://1234/" << "docker" << "1234" << "/";
+    QTest::newRow("docker-root-url-special") << QDir::rootPath() + "__qtc_devices__/docker/1234/" << "docker" << "1234" << "/";
+
+    QTest::newRow("qtc-dev") << QDir::rootPath() + "__qtc_devices__" << "" << "" << QDir::rootPath() + "__qtc_devices__";
+    QTest::newRow("qtc-dev-type") << QDir::rootPath() + "__qtc_devices__/docker" << "" << "" << QDir::rootPath() + "__qtc_devices__/docker";
+    QTest::newRow("qtc-dev-type-dev") << QDir::rootPath() + "__qtc_devices__/docker/1234" << "docker" << "1234" << "/";
+
+}
+
+void tst_fileutils::fromString()
+{
+    QFETCH(QString, input);
+    QFETCH(QString, scheme);
+    QFETCH(QString, host);
+    QFETCH(QString, path);
+    FilePath filePath = FilePath::fromString(input);
+    QCOMPARE(filePath.scheme(), scheme);
+    QCOMPARE(filePath.host(), host);
+    QCOMPARE(filePath.path(), path);
+}
+
 void tst_fileutils::fromToString_data()
 {
     QTest::addColumn<QString>("scheme");
@@ -294,14 +375,14 @@ void tst_fileutils::fromToString_data()
     QTest::newRow("s3") << "" << "" << "/a/b" << "/a/b";
 
     QTest::newRow("s4")
-        << "docker" << "1234abcdef" << "/bin/ls" << "docker://1234abcdef/bin/ls";
+        << "docker" << "1234abcdef" << "/bin/ls" << QDir::rootPath() + "__qtc_devices__/docker/1234abcdef/bin/ls";
 
     QTest::newRow("s5")
-        << "docker" << "1234" << "/bin/ls" << "docker://1234/bin/ls";
+        << "docker" << "1234" << "/bin/ls" << QDir::rootPath() + "__qtc_devices__/docker/1234/bin/ls";
 
     // This is not a proper URL.
     QTest::newRow("s6")
-        << "docker" << "1234" << "somefile" << "docker://1234/./somefile";
+        << "docker" << "1234" << "somefile" << QDir::rootPath() + "__qtc_devices__/docker/1234/./somefile";
 
     // Local Windows paths:
     QTest::newRow("w1") << "" << "" << "C:/data" << "C:/data";

tests/auto/utils/fsengine/CMakeLists.txt

@@ -0,0 +1,4 @@
+add_qtc_test(tst_utils_fsengine
+  DEPENDS Utils
+  SOURCES tst_fsengine.cpp
+)

tests/auto/utils/fsengine/tst_fsengine.cpp

@@ -0,0 +1,291 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#include <utils/filepath.h>
+#include <utils/fileutils.h>
+#include <utils/fsengine/fsengine.h>
+#include <utils/hostosinfo.h>
+
+#include <QDebug>
+#include <QFileSystemModel>
+#include <QtTest>
+
+using namespace Utils;
+
+class tst_fsengine : public QObject
+{
+    Q_OBJECT
+
+private slots:
+    void initTestCase();
+
+    void testFilePathFromToString();
+
+    void testRootPathContainsFakeDir();
+    void testNotExistingFile();
+    void testCreateFile();
+    void testListDir();
+    void testCreateDir();
+    void testWindowsPaths();
+    void testUrl();
+
+private:
+    QString makeTestPath(QString path, bool asUrl = false);
+
+private:
+    FSEngine engine;
+    QString tempFolder;
+};
+
+template<class... Args>
+using Continuation = std::function<void(Args...)>;
+
+void tst_fsengine::initTestCase()
+{
+    if (!FSEngine::isAvailable())
+        QSKIP("Utils was built without Filesystem Engine");
+
+    DeviceFileHooks deviceHooks;
+
+    deviceHooks.fileContents =
+        [](const FilePath &path, qint64 maxSize, qint64 offset) -> QByteArray {
+        return FilePath::fromString(path.path()).fileContents(maxSize, offset);
+    };
+
+    deviceHooks.isExecutableFile = [](const FilePath &filePath) {
+        return FilePath::fromString(filePath.path()).isExecutableFile();
+    };
+    deviceHooks.isReadableFile = [](const FilePath &filePath) {
+        return FilePath::fromString(filePath.path()).isReadableFile();
+    };
+    deviceHooks.isReadableDir = [](const FilePath &filePath) {
+        return FilePath::fromString(filePath.path()).isReadableDir();
+    };
+    deviceHooks.isWritableDir = [](const FilePath &filePath) {
+        return FilePath::fromString(filePath.path()).isWritableDir();
+    };
+    deviceHooks.isWritableFile = [](const FilePath &filePath) {
+        return FilePath::fromString(filePath.path()).isWritableFile();
+    };
+    deviceHooks.isFile = [](const FilePath &filePath) {
+        return FilePath::fromString(filePath.path()).isFile();
+    };
+    deviceHooks.isDir = [](const FilePath &filePath) {
+        return FilePath::fromString(filePath.path()).isDir();
+    };
+    deviceHooks.ensureWritableDir = [](const FilePath &filePath) {
+        return FilePath::fromString(filePath.path()).ensureWritableDir();
+    };
+    deviceHooks.ensureExistingFile = [](const FilePath &filePath) {
+        return FilePath::fromString(filePath.path()).ensureExistingFile();
+    };
+    deviceHooks.createDir = [](const FilePath &filePath) {
+        return FilePath::fromString(filePath.path()).createDir();
+    };
+    deviceHooks.exists = [](const FilePath &filePath) {
+        return FilePath::fromString(filePath.path()).exists();
+    };
+    deviceHooks.removeFile = [](const FilePath &filePath) {
+        return FilePath::fromString(filePath.path()).removeFile();
+    };
+    deviceHooks.removeRecursively = [](const FilePath &filePath) {
+        return FilePath::fromString(filePath.path()).removeRecursively();
+    };
+    deviceHooks.copyFile = [](const FilePath &filePath, const FilePath &target) {
+        return FilePath::fromString(filePath.path()).copyFile(target);
+    };
+    deviceHooks.renameFile = [](const FilePath &filePath, const FilePath &target) {
+        return FilePath::fromString(filePath.path()).renameFile(target);
+    };
+    deviceHooks.searchInPath = [](const FilePath &filePath, const FilePaths &dirs) {
+        return FilePath::fromString(filePath.path()).searchInPath(dirs);
+    };
+    deviceHooks.symLinkTarget = [](const FilePath &filePath) {
+        return FilePath::fromString(filePath.path()).symLinkTarget();
+    };
+    deviceHooks.iterateDirectory = [](const FilePath &filePath,
+                                      const std::function<bool(const FilePath &)> &callBack,
+                                      const FileFilter &filter) {
+        return FilePath::fromString(filePath.path())
+            .iterateDirectory(
+                [&filePath, &callBack](const FilePath &path) -> bool {
+                    const FilePath devicePath = path.onDevice(filePath);
+
+                    return callBack(devicePath);
+                },
+                filter);
+    };
+    deviceHooks.asyncFileContents = [](const Continuation<QByteArray> &cont,
+                                       const FilePath &filePath,
+                                       qint64 maxSize,
+                                       qint64 offset) {
+        return FilePath::fromString(filePath.path()).asyncFileContents(cont, maxSize, offset);
+    };
+    deviceHooks.writeFileContents = [](const FilePath &filePath, const QByteArray &data) {
+        return FilePath::fromString(filePath.path()).writeFileContents(data);
+    };
+    deviceHooks.lastModified = [](const FilePath &filePath) {
+        return FilePath::fromString(filePath.path()).lastModified();
+    };
+    deviceHooks.permissions = [](const FilePath &filePath) {
+        return FilePath::fromString(filePath.path()).permissions();
+    };
+    deviceHooks.setPermissions = [](const FilePath &filePath, QFile::Permissions permissions) {
+        return FilePath::fromString(filePath.path()).setPermissions(permissions);
+    };
+    deviceHooks.osType = [](const FilePath &filePath) {
+        return FilePath::fromString(filePath.path()).osType();
+    };
+    // deviceHooks.environment = [](const FilePath &filePath) -> Environment {return {};};
+    deviceHooks.fileSize = [](const FilePath &filePath) {
+        return FilePath::fromString(filePath.path()).fileSize();
+    };
+    deviceHooks.bytesAvailable = [](const FilePath &filePath) {
+        return FilePath::fromString(filePath.path()).bytesAvailable();
+    };
+
+    deviceHooks.mapToDevicePath = [](const FilePath &filePath) { return filePath.path(); };
+
+    FileUtils::setDeviceFileHooks(deviceHooks);
+
+    FSEngine::addDevice(FilePath::fromString("device://test"));
+
+    tempFolder = QDir::tempPath();
+    QDir testFolder(QString("%1/tst_fsengine").arg(tempFolder));
+    if (testFolder.exists())
+        QVERIFY(testFolder.removeRecursively());
+
+    QDir(tempFolder).mkdir("tst_fsengine");
+}
+
+void tst_fsengine::testFilePathFromToString()
+{
+    FilePath p = FilePath::fromString("device://test/test.txt");
+    QCOMPARE(p.scheme(), "device");
+    QCOMPARE(p.host(), "test");
+    QCOMPARE(p.path(), "/test.txt");
+
+    QString asString = p.toString();
+    QCOMPARE(asString,
+             FilePath::specialPath(FilePath::SpecialPathComponent::DeviceRootPath)
+                 + "/test/test.txt");
+
+    FilePath p2 = FilePath::fromString(asString);
+    QCOMPARE(p.scheme(), "device");
+    QCOMPARE(p.host(), "test");
+    QCOMPARE(p.path(), "/test.txt");
+}
+
+void tst_fsengine::testRootPathContainsFakeDir()
+{
+    QDir root(HostOsInfo::isWindowsHost() ? "c:/" : "/");
+
+    const auto rootList = root.entryList();
+    QVERIFY(rootList.contains(FilePath::specialPath(FilePath::SpecialPathComponent::RootName)));
+
+    QDir schemes(FilePath::specialPath(FilePath::SpecialPathComponent::RootPath));
+    const auto schemeList = schemes.entryList();
+    QVERIFY(schemeList.contains("device"));
+
+    QDir deviceRoot(FilePath::specialPath(FilePath::SpecialPathComponent::DeviceRootPath) + "/test");
+    const auto deviceRootList = deviceRoot.entryList();
+    QVERIFY(!deviceRootList.isEmpty());
+}
+
+void tst_fsengine::testNotExistingFile()
+{
+    QFile f(makeTestPath("test-does-not-exist.txt"));
+
+    QCOMPARE(f.open(QIODevice::ReadOnly), false);
+}
+
+void tst_fsengine::testCreateFile()
+{
+    {
+        QFile f(makeTestPath("test-create-file.txt"));
+        QCOMPARE(f.exists(), false);
+        QVERIFY(f.open(QIODevice::WriteOnly));
+    }
+
+    QFile f(makeTestPath("test-create-file.txt"));
+    QCOMPARE(f.exists(), true);
+}
+
+void tst_fsengine::testCreateDir()
+{
+    QDir d(makeTestPath({}));
+    QCOMPARE(d.mkdir("test-create-dir"), true);
+}
+
+QString tst_fsengine::makeTestPath(QString path, bool asUrl)
+{
+    if (asUrl) {
+        return QString("device://test%1/tst_fsengine/%2").arg(tempFolder, path);
+    }
+
+    return QString(FilePath::specialPath(FilePath::SpecialPathComponent::DeviceRootPath)
+                   + "/test%1/tst_fsengine/%2")
+        .arg(tempFolder, path);
+}
+
+void tst_fsengine::testListDir()
+{
+    QDir dd(makeTestPath({}));
+    QCOMPARE(dd.mkdir("test-list-dir"), true);
+
+    QDir d(makeTestPath("test-list-dir"));
+
+    {
+        QFile f(makeTestPath("test-list-dir/f1.txt"));
+        QVERIFY(f.open(QIODevice::WriteOnly));
+    }
+
+    const auto list = d.entryList();
+    QVERIFY(list.contains("f1.txt"));
+}
+
+void tst_fsengine::testWindowsPaths()
+{
+    if (!HostOsInfo::isWindowsHost())
+        QSKIP("This test is only valid on windows");
+
+    // Test upper-case "C:"
+    QVERIFY(FilePath::fromString("C:/__qtc_devices__/device/{cd6c7e4b-12fd-43ca-9bb2-053a38e6b7c5}")
+                .needsDevice());
+
+    // Test lower-case "C:"
+    QVERIFY(FilePath::fromString("c:/__qtc_devices__/device/{cd6c7e4b-12fd-43ca-9bb2-053a38e6b7c5}")
+                .needsDevice());
+}
+
+void tst_fsengine::testUrl()
+{
+    FilePath p = FilePath::fromString(makeTestPath("", true));
+
+    QVERIFY(p.needsDevice());
+}
+
+QTEST_GUILESS_MAIN(tst_fsengine)
+#include "tst_fsengine.moc"