Start making the Maemo support more generic.

This includes:
    - decoupling deploy configurations from targets (Reviewed-by: dt)
    - adding a "Generic Linux" device type
    - splitting up the Maemo deployment step into small pieces that
      can be combined in different ways (and much more easily maintained)
    - adding a new version handler for pro.user files
      (Reviewed-by: Tobias Hunger)

Also:
  - Add and use an SSH manager class for easier connection sharing.
  - Make the SSH connection parameters a fixed attribute of the connection.

src/libs/utils/ssh/sshconnectionmanager.cpp

@@ -0,0 +1,196 @@
+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** No Commercial Usage
+**
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+**
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**************************************************************************/
+#include "sshconnectionmanager.h"
+
+#include "sshconnection.h"
+
+#include <QtCore/QCoreApplication>
+#include <QtCore/QList>
+#include <QtCore/QMutex>
+#include <QtCore/QMutexLocker>
+#include <QtCore/QObject>
+#include <QtCore/QThread>
+#include <QtCore/QTimer>
+
+namespace Utils {
+namespace Internal {
+
+struct ConnectionInfo
+{
+    typedef QSharedPointer<ConnectionInfo> Ptr;
+    static ConnectionInfo::Ptr create(const SshConnection::Ptr &conn)
+    {
+        return Ptr(new ConnectionInfo(conn));
+    }
+
+    SshConnection::Ptr connection;
+    int refCount;
+    bool isConnecting;
+
+private:
+    ConnectionInfo(const SshConnection::Ptr &conn)
+        : connection(conn), refCount(1), isConnecting(false) {}
+};
+
+class SshConnectionManagerPrivate : public QObject
+{
+    Q_OBJECT
+
+public:
+
+    static QMutex instanceMutex;
+    static SshConnectionManager &instance()
+    {
+        static SshConnectionManager manager;
+        return manager;
+    }
+
+    SshConnectionManagerPrivate()
+    {
+        moveToThread(QCoreApplication::instance()->thread());
+        connect(&m_cleanupTimer, SIGNAL(timeout()), SLOT(cleanup()));
+        m_cleanupTimer.start(5*60*1000);
+    }
+
+    ConnectionInfo::Ptr findConnection(const SshConnection::Ptr &connection)
+    {
+        foreach (const ConnectionInfo::Ptr &connInfo, m_connections) {
+            if (connInfo->connection == connection)
+                return connInfo;
+        }
+        return ConnectionInfo::Ptr();
+    }
+
+
+    QSharedPointer<SshConnection> acquireConnection(const SshConnectionParameters &sshParams)
+    {
+        QMutexLocker locker(&m_listMutex);
+        foreach (const ConnectionInfo::Ptr &connInfo, m_connections) {
+            const SshConnection::Ptr connection = connInfo->connection;
+            bool connectionUsable = false;
+            if (connection->state() == SshConnection::Connected
+                    && connection->connectionParameters() == sshParams) {
+                if (connInfo->refCount == 0) {
+                    if (connection->thread() != QThread::currentThread()) {
+                        QMetaObject::invokeMethod(this, "switchToCallerThread",
+                            Qt::BlockingQueuedConnection,
+                            Q_ARG(SshConnection *, connection.data()),
+                            Q_ARG(QObject *, QThread::currentThread()));
+                    }
+                    connectionUsable = true;
+                } else if (connection->thread() == QThread::currentThread()) {
+                    connectionUsable = true;
+                }
+                if (connectionUsable) {
+                    ++connInfo->refCount;
+                    return connection;
+                }
+            }
+        }
+
+        ConnectionInfo::Ptr connInfo
+            = ConnectionInfo::create(SshConnection::create(sshParams));
+        m_connections << connInfo;
+        return connInfo->connection;
+    }
+
+    void releaseConnection(const SshConnection::Ptr &connection)
+    {
+        QMutexLocker locker(&m_listMutex);
+        ConnectionInfo::Ptr connInfo = findConnection(connection);
+        Q_ASSERT_X(connInfo, Q_FUNC_INFO, "Fatal: Unowned SSH Connection released.");
+        if (--connInfo->refCount == 0) {
+            connection->moveToThread(QCoreApplication::instance()->thread());
+            if (connection->state() != SshConnection::Connected)
+                m_connections.removeOne(connInfo);
+        }
+    }
+
+private:
+    Q_INVOKABLE void switchToCallerThread(SshConnection *connection, QObject *threadObj)
+    {
+        connection->moveToThread(qobject_cast<QThread *>(threadObj));
+    }
+
+    Q_SLOT void cleanup()
+    {
+        QMutexLocker locker(&m_listMutex);
+        foreach (const ConnectionInfo::Ptr &connInfo, m_connections) {
+            if (connInfo->refCount == 0 &&
+                    connInfo->connection->state() != SshConnection::Connected) {
+                m_connections.removeOne(connInfo);
+            }
+        }
+    }
+
+    // We expect the number of concurrently open connections to be small.
+    // If that turns out to not be the case, we can still use a data
+    // structure with faster access.
+    QList<ConnectionInfo::Ptr> m_connections;
+
+    QMutex m_listMutex;
+    QTimer m_cleanupTimer;
+};
+
+QMutex SshConnectionManagerPrivate::instanceMutex;
+
+} // namespace Internal
+
+SshConnectionManager &SshConnectionManager::instance()
+{
+    QMutexLocker locker(&Internal::SshConnectionManagerPrivate::instanceMutex);
+    return Internal::SshConnectionManagerPrivate::instance();
+}
+
+SshConnectionManager::SshConnectionManager()
+    : d(new Internal::SshConnectionManagerPrivate)
+{
+}
+
+SshConnectionManager::~SshConnectionManager()
+{
+}
+
+SshConnection::Ptr SshConnectionManager::acquireConnection(const SshConnectionParameters &sshParams)
+{
+    return d->acquireConnection(sshParams);
+}
+
+void SshConnectionManager::releaseConnection(const SshConnection::Ptr &connection)
+{
+    d->releaseConnection(connection);
+}
+
+} // namespace Utils
+
+#include "sshconnectionmanager.moc"