Utils: Add a FilePath::environment

A hook into the system environment of the FilePath's device.

Change-Id: I274032f9e716f3cd8b2e4af2eca010b9805a4568
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/libs/utils/fileutils.cpp

@@ -1387,6 +1387,16 @@ FilePath FilePath::onDeviceSearchInPath() const
     return Environment::systemEnvironment().searchInPath(path());
 }
 
+Environment FilePath::deviceEnvironment() const
+{
+    if (needsDevice()) {
+        QTC_ASSERT(s_deviceHooks.environment, return {});
+        return s_deviceHooks.environment(*this);
+    }
+    return Environment::systemEnvironment();
+}
+
+
 FilePath FilePath::pathAppended(const QString &path) const
 {
     FilePath fn = *this;

src/libs/utils/fileutils.h

@@ -40,7 +40,10 @@
 #include <functional>
 #include <memory>
 
-namespace Utils { class FilePath; }
+namespace Utils {
+class Environment;
+class FilePath;
+} // Utils
 
 QT_BEGIN_NAMESPACE
 class QDataStream;
@@ -91,6 +94,7 @@ public:
     std::function<QDateTime(const FilePath &)> lastModified;
     std::function<QFile::Permissions(const FilePath &)> permissions;
     std::function<OsType(const FilePath &)> osType;
+    std::function<Environment(const FilePath &)> environment;
 };
 
 class QTCREATOR_UTILS_EXPORT FilePath
@@ -213,6 +217,7 @@ public:
     static void setDeviceFileHooks(const DeviceFileHooks &hooks);
 
     FilePath onDeviceSearchInPath() const;
+    Environment deviceEnvironment() const;
 
 private:
     friend class ::tst_fileutils;

src/plugins/projectexplorer/devicesupport/devicemanager.cpp

@@ -507,6 +507,12 @@ DeviceManager::DeviceManager(bool isInstance) : d(std::make_unique<DeviceManager
         return device->osType();
     };
 
+    deviceHooks.environment = [](const FilePath &filePath) {
+        auto device = DeviceManager::deviceForPath(filePath);
+        QTC_ASSERT(device, return Environment{});
+        return device->systemEnvironment();
+    };
+
     FilePath::setDeviceFileHooks(deviceHooks);
 
     DeviceProcessHooks processHooks;