VCS: Enable calling runVcs from non-GUI threads

* Introduce a proxy class for thread synchronization
* Use signals for appending text to output window

Change-Id: Iecbb010e6b6e9dab27d9862a43dafa450f2bb1f8
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

9 files changed, 103 insertions, 34 deletions

diff --git a/src/libs/utils/synchronousprocess.cpp b/src/libs/utils/synchronousprocess.cpp
index f9c181c205..7fb83c6477 100644
--- a/src/libs/utils/synchronousprocess.cpp
+++ b/src/libs/utils/synchronousprocess.cpp
@@ -36,6 +36,7 @@
 #include <QTextCodec>
 #include <QDir>
 #include <QMessageBox>
+#include <QThread>
 
 #include <QApplication>
 
@@ -359,6 +360,11 @@ void SynchronousProcess::setProcessChannelMode(QProcess::ProcessChannelMode m)
     d->m_process.setProcessChannelMode(m);
 }
 
+static bool isGuiThread()
+{
+    return QThread::currentThread() == QCoreApplication::instance()->thread();
+}
+
 SynchronousProcessResponse SynchronousProcess::run(const QString &binary,
                                                  const QStringList &args)
 {
@@ -375,7 +381,8 @@ SynchronousProcessResponse SynchronousProcess::run(const QString &binary,
     d->m_process.closeWriteChannel();
     if (!d->m_startFailure) {
         d->m_timer.start();
-        QApplication::setOverrideCursor(Qt::WaitCursor);
+        if (isGuiThread())
+            QApplication::setOverrideCursor(Qt::WaitCursor);
         d->m_eventLoop.exec(QEventLoop::ExcludeUserInputEvents);
         if (d->m_result.result == SynchronousProcessResponse::Finished || d->m_result.result == SynchronousProcessResponse::FinishedError) {
             processStdOut(false);
@@ -386,7 +393,8 @@ SynchronousProcessResponse SynchronousProcess::run(const QString &binary,
         d->m_result.stdErr = d->m_stdErr.data;
 
         d->m_timer.stop();
-        QApplication::restoreOverrideCursor();
+        if (isGuiThread())
+            QApplication::restoreOverrideCursor();
     }
 
     if (debug)
@@ -396,6 +404,8 @@ SynchronousProcessResponse SynchronousProcess::run(const QString &binary,
 
 static inline bool askToKill(const QString &binary = QString())
 {
+    if (!isGuiThread())
+        return true;
     const QString title = SynchronousProcess::tr("Process not Responding");
     QString msg = binary.isEmpty() ?
                   SynchronousProcess::tr("The process is not responding.") :
diff --git a/src/plugins/clearcase/clearcaseplugin.cpp b/src/plugins/clearcase/clearcaseplugin.cpp
index 571d94fe00..cdb30368fb 100644
--- a/src/plugins/clearcase/clearcaseplugin.cpp
+++ b/src/plugins/clearcase/clearcaseplugin.cpp
@@ -1376,7 +1376,9 @@ ClearCaseResponse
 
     const Utils::SynchronousProcessResponse sp_resp =
             VcsBase::VcsBasePlugin::runVcs(workingDir, executable,
-                                           arguments, timeOut, flags, outputCodec);
+                                           arguments, timeOut,
+                                           VcsBase::VcsBasePlugin::sshPrompt(),
+                                           flags, outputCodec);
 
     response.error = sp_resp.result != Utils::SynchronousProcessResponse::Finished;
     if (response.error)
diff --git a/src/plugins/cvs/cvsplugin.cpp b/src/plugins/cvs/cvsplugin.cpp
index 06a54fa683..1371e2418a 100644
--- a/src/plugins/cvs/cvsplugin.cpp
+++ b/src/plugins/cvs/cvsplugin.cpp
@@ -1236,9 +1236,8 @@ CvsResponse CvsPlugin::runCvs(const QString &workingDirectory,
     }
     // Run, connect stderr to the output window
     const Utils::SynchronousProcessResponse sp_resp =
-            runVcs(workingDirectory, executable,
-                   m_settings.addOptions(arguments),
-                   timeOut, flags, outputCodec);
+            runVcs(workingDirectory, executable, m_settings.addOptions(arguments),
+                   timeOut, VcsBase::VcsBasePlugin::sshPrompt(), flags, outputCodec);
 
     response.result = CvsResponse::OtherError;
     response.stdErr = sp_resp.stdErr;
diff --git a/src/plugins/git/gitclient.cpp b/src/plugins/git/gitclient.cpp
index 57a2f37664..17fd2e507d 100644
--- a/src/plugins/git/gitclient.cpp
+++ b/src/plugins/git/gitclient.cpp
@@ -2322,7 +2322,7 @@ Utils::SynchronousProcessResponse GitClient::synchronousGit(const QString &worki
 {
     return VcsBasePlugin::runVcs(workingDirectory, gitBinaryPath(), gitArguments,
                                  settings()->intValue(GitSettings::timeoutKey) * 1000,
-                                 processEnvironment(),
+                                 processEnvironment(), VcsBase::VcsBasePlugin::sshPrompt(),
                                  flags, outputCodec);
 }
 
diff --git a/src/plugins/mercurial/mercurialclient.cpp b/src/plugins/mercurial/mercurialclient.cpp
index 274cd57a65..2a98a4ecb0 100644
--- a/src/plugins/mercurial/mercurialclient.cpp
+++ b/src/plugins/mercurial/mercurialclient.cpp
@@ -146,7 +146,8 @@ bool MercurialClient::synchronousPull(const QString &workingDir, const QString &
     QProcessEnvironment env = QProcessEnvironment::systemEnvironment();
     env.insert(QLatin1String("LANGUAGE"), QLatin1String("C"));
     const Utils::SynchronousProcessResponse resp = VcsBase::VcsBasePlugin::runVcs(
-                workingDir, binary, args, timeoutSec * 1000, env, flags);
+                workingDir, binary, args, timeoutSec * 1000, env,
+                VcsBase::VcsBasePlugin::sshPrompt(), flags);
     const bool ok = resp.result == Utils::SynchronousProcessResponse::Finished;
 
     parsePullOutput(resp.stdOut.trimmed());
diff --git a/src/plugins/subversion/subversionplugin.cpp b/src/plugins/subversion/subversionplugin.cpp
index 13268bc36a..aff1a6e8b2 100644
--- a/src/plugins/subversion/subversionplugin.cpp
+++ b/src/plugins/subversion/subversionplugin.cpp
@@ -1120,7 +1120,8 @@ SubversionPlugin::Version SubversionPlugin::svnVersion()
         args << QLatin1String("--version") << QLatin1String("-q");
         const Utils::SynchronousProcessResponse response =
                 VcsBase::VcsBasePlugin::runVcs(QDir().absolutePath(), m_settings.binaryPath(),
-                                               args, m_settings.timeOutMs(), 0);
+                                               args, m_settings.timeOutMs(),
+                                               VcsBase::VcsBasePlugin::sshPrompt(), 0);
         if (response.result == Utils::SynchronousProcessResponse::Finished &&
                 response.exitCode == 0) {
             m_svnVersionBinary = m_settings.binaryPath();
@@ -1154,8 +1155,8 @@ SubversionResponse SubversionPlugin::runSvn(const QString &workingDir,
 
     const QStringList completeArguments = SubversionPlugin::addAuthenticationOptions(arguments, userName, password);
     const Utils::SynchronousProcessResponse sp_resp =
-            VcsBase::VcsBasePlugin::runVcs(workingDir, executable,
-                                           completeArguments, timeOut, flags, outputCodec);
+            VcsBase::VcsBasePlugin::runVcs(workingDir, executable, completeArguments, timeOut,
+                                           VcsBase::VcsBasePlugin::sshPrompt(), flags, outputCodec);
 
     response.error = sp_resp.result != Utils::SynchronousProcessResponse::Finished;
     if (response.error)
diff --git a/src/plugins/vcsbase/vcsbaseclient.cpp b/src/plugins/vcsbase/vcsbaseclient.cpp
index ffa4b42bbc..9e4f316de9 100644
--- a/src/plugins/vcsbase/vcsbaseclient.cpp
+++ b/src/plugins/vcsbase/vcsbaseclient.cpp
@@ -318,8 +318,8 @@ Utils::SynchronousProcessResponse VcsBaseClient::vcsSynchronousExec(
 {
     const QString binary = settings()->binaryPath();
     const int timeoutSec = settings()->intValue(VcsBaseClientSettings::timeoutKey);
-    return VcsBase::VcsBasePlugin::runVcs(workingDirectory, binary, args,
-                                          timeoutSec * 1000, flags, outputCodec);
+    return VcsBase::VcsBasePlugin::runVcs(workingDirectory, binary, args, timeoutSec * 1000,
+                                          VcsBase::VcsBasePlugin::sshPrompt(), flags, outputCodec);
 }
 
 void VcsBaseClient::annotate(const QString &workingDir, const QString &file,
diff --git a/src/plugins/vcsbase/vcsbaseplugin.cpp b/src/plugins/vcsbase/vcsbaseplugin.cpp
index a7133007df..0911da9d7e 100644
--- a/src/plugins/vcsbase/vcsbaseplugin.cpp
+++ b/src/plugins/vcsbase/vcsbaseplugin.cpp
@@ -468,6 +468,34 @@ VCSBASE_EXPORT QDebug operator<<(QDebug in, const VcsBasePluginState &state)
     return in;
 }
 
+class OutputProxy : public QObject
+{
+    Q_OBJECT
+
+    friend class VcsBasePlugin;
+
+public:
+    OutputProxy()
+    {
+        // Users of this class can either be in the GUI thread or in other threads.
+        // Use Qt::AutoConnection to always append in the GUI thread (directly or queued)
+        VcsBase::VcsBaseOutputWindow *outputWindow = VcsBase::VcsBaseOutputWindow::instance();
+        connect(this, SIGNAL(append(QString)), outputWindow, SLOT(append(QString)));
+        connect(this, SIGNAL(appendSilently(QString)), outputWindow, SLOT(appendSilently(QString)));
+        connect(this, SIGNAL(appendError(QString)), outputWindow, SLOT(appendError(QString)));
+        connect(this, SIGNAL(appendCommand(QString,QString,QStringList)),
+                outputWindow, SLOT(appendCommand(QString,QString,QStringList)));
+    }
+
+signals:
+    void append(const QString &text);
+    void appendSilently(const QString &text);
+    void appendError(const QString &text);
+    void appendCommand(const QString &workingDirectory,
+                       const QString &binary,
+                       const QStringList &args);
+};
+
 /*!
     \class VcsBase::VcsBasePlugin
 
@@ -798,9 +826,9 @@ QString VcsBasePlugin::findRepositoryForDirectory(const QString &dirS,
 }
 
 // Is SSH prompt configured?
-static inline QString sshPrompt()
+QString VcsBasePlugin::sshPrompt()
 {
-    return VcsBase::Internal::VcsPlugin::instance()->settings().sshPasswordPrompt;
+    return Internal::VcsPlugin::instance()->settings().sshPasswordPrompt;
 }
 
 bool VcsBasePlugin::isSshPromptConfigured()
@@ -810,22 +838,30 @@ bool VcsBasePlugin::isSshPromptConfigured()
 
 void VcsBasePlugin::setProcessEnvironment(QProcessEnvironment *e, bool forceCLocale)
 {
+    setProcessEnvironment(e, forceCLocale, sshPrompt());
+}
+
+void VcsBasePlugin::setProcessEnvironment(QProcessEnvironment *e,
+                                          bool forceCLocale,
+                                          const QString &sshPromptBinary)
+{
     if (forceCLocale)
         e->insert(QLatin1String("LANG"), QString(QLatin1Char('C')));
-    const QString sshPromptBinary = sshPrompt();
     if (!sshPromptBinary.isEmpty())
         e->insert(QLatin1String("SSH_ASKPASS"), sshPromptBinary);
 }
 
 // Run a process fully synchronously, returning Utils::SynchronousProcessResponse
 // response struct and using the VcsBasePlugin flags as applicable
-static SynchronousProcessResponse runVcsFullySynchronously(const QString &workingDir,
+SynchronousProcessResponse VcsBasePlugin::runVcsFullySynchronously(
+                              const QString &workingDir,
                               const QString &binary,
                               const QStringList &arguments,
                               int timeOutMS,
                               QProcessEnvironment env,
+                              const QString &sshPasswordPrompt,
                               unsigned flags,
-                              QTextCodec *outputCodec = 0)
+                              QTextCodec *outputCodec)
 {
     SynchronousProcessResponse response;
     if (binary.isEmpty()) {
@@ -833,11 +869,9 @@ static SynchronousProcessResponse runVcsFullySynchronously(const QString &workin
         return response;
     }
 
-    VcsBase::VcsBaseOutputWindow *outputWindow = VcsBase::VcsBaseOutputWindow::instance();
-
     // Set up process
     unsigned processFlags = 0;
-    if (VcsBasePlugin::isSshPromptConfigured() && (flags & VcsBasePlugin::SshPasswordPrompt))
+    if (!sshPasswordPrompt.isEmpty() && (flags & VcsBasePlugin::SshPasswordPrompt))
         processFlags |= SynchronousProcess::UnixTerminalDisabled;
     QSharedPointer<QProcess> process = SynchronousProcess::createProcess(processFlags);
     if (!workingDir.isEmpty())
@@ -861,11 +895,12 @@ static SynchronousProcessResponse runVcsFullySynchronously(const QString &workin
             !SynchronousProcess::readDataFromProcess(*process.data(), timeOutMS,
                                                             &stdOut, &stdErr, true);
 
+    OutputProxy output;
     if (!stdErr.isEmpty()) {
         response.stdErr = Utils::SynchronousProcess::normalizeNewlines(
                     outputCodec ? outputCodec->toUnicode(stdErr) : QString::fromLocal8Bit(stdErr));
         if (!(flags & VcsBasePlugin::SuppressStdErrInLogWindow))
-            outputWindow->append(response.stdErr);
+            emit output.append(response.stdErr);
     }
 
     if (!stdOut.isEmpty()) {
@@ -873,9 +908,9 @@ static SynchronousProcessResponse runVcsFullySynchronously(const QString &workin
                     outputCodec ? outputCodec->toUnicode(stdOut) : QString::fromLocal8Bit(stdOut));
         if (flags & VcsBasePlugin::ShowStdOutInLogWindow) {
             if (flags & VcsBasePlugin::SilentOutput)
-                outputWindow->appendSilently(response.stdOut);
+                emit output.appendSilently(response.stdOut);
             else
-                outputWindow->append(response.stdOut);
+                emit output.append(response.stdOut);
         }
     }
 
@@ -897,12 +932,13 @@ SynchronousProcessResponse VcsBasePlugin::runVcs(const QString &workingDir,
                       const QString &binary,
                       const QStringList &arguments,
                       int timeOutMS,
+                      const QString &sshPasswordPrompt,
                       unsigned flags,
                       QTextCodec *outputCodec)
 {
     const QProcessEnvironment env = QProcessEnvironment::systemEnvironment();
     return runVcs(workingDir, binary, arguments, timeOutMS, env,
-                  flags, outputCodec);
+                  sshPasswordPrompt, flags, outputCodec);
 }
 
 SynchronousProcessResponse VcsBasePlugin::runVcs(const QString &workingDir,
@@ -910,10 +946,12 @@ SynchronousProcessResponse VcsBasePlugin::runVcs(const QString &workingDir,
                                                  const QStringList &arguments,
                                                  int timeOutMS,
                                                  QProcessEnvironment env,
+                                                 const QString &sshPasswordPrompt,
                                                  unsigned flags,
                                                  QTextCodec *outputCodec)
 {
     SynchronousProcessResponse response;
+    OutputProxy output;
 
     if (binary.isEmpty()) {
         response.result = SynchronousProcessResponse::StartFailed;
@@ -923,9 +961,9 @@ SynchronousProcessResponse VcsBasePlugin::runVcs(const QString &workingDir,
     VcsBase::VcsBaseOutputWindow *outputWindow = VcsBase::VcsBaseOutputWindow::instance();
 
     if (!(flags & SuppressCommandLogging))
-        outputWindow->appendCommand(workingDir, binary, arguments);
+        emit output.appendCommand(workingDir, binary, arguments);
 
-    const bool sshPromptConfigured = VcsBasePlugin::isSshPromptConfigured();
+    const bool sshPromptConfigured = !sshPasswordPrompt.isEmpty();
     if (debugExecution) {
         QDebug nsp = qDebug().nospace();
         nsp << "VcsBasePlugin::runVcs" << workingDir << binary << arguments
@@ -952,14 +990,14 @@ SynchronousProcessResponse VcsBasePlugin::runVcs(const QString &workingDir,
             nsp << " Codec: " << outputCodec->name();
     }
 
-    VcsBase::VcsBasePlugin::setProcessEnvironment(&env, (flags & ForceCLocale));
+    setProcessEnvironment(&env, (flags & ForceCLocale), sshPasswordPrompt);
 
     // TODO tell the document manager about expected repository changes
     //    if (flags & ExpectRepoChanges)
     //        Core::DocumentManager::expectDirectoryChange(workingDir);
     if (flags & FullySynchronously) {
         response = runVcsFullySynchronously(workingDir, binary, arguments, timeOutMS,
-                                             env, flags, outputCodec);
+                                            env, sshPasswordPrompt, flags, outputCodec);
     } else {
         // Run, connect stderr to the output window
         SynchronousProcess process;
@@ -1000,10 +1038,9 @@ SynchronousProcessResponse VcsBasePlugin::runVcs(const QString &workingDir,
     // Success/Fail message in appropriate window?
     if (response.result == SynchronousProcessResponse::Finished) {
         if (flags & ShowSuccessMessage)
-            outputWindow->append(response.exitMessage(binary, timeOutMS));
-    } else {
-        if (!(flags & SuppressFailMessageInLogWindow))
-            outputWindow->appendError(response.exitMessage(binary, timeOutMS));
+            emit output.append(response.exitMessage(binary, timeOutMS));
+    } else if (!(flags & SuppressFailMessageInLogWindow)) {
+        emit output.appendError(response.exitMessage(binary, timeOutMS));
     }
     if (flags & ExpectRepoChanges) {
         // TODO tell the document manager that the directory now received all expected changes
@@ -1026,8 +1063,9 @@ bool VcsBasePlugin::runFullySynchronous(const QString &workingDirectory,
     if (binary.isEmpty())
         return false;
 
+    OutputProxy output;
     if (!(flags & SuppressCommandLogging))
-        VcsBase::VcsBaseOutputWindow::instance()->appendCommand(workingDirectory, binary, arguments);
+        emit output.appendCommand(workingDirectory, binary, arguments);
 
     // TODO tell the document manager about expected repository changes
     // if (flags & ExpectRepoChanges)
diff --git a/src/plugins/vcsbase/vcsbaseplugin.h b/src/plugins/vcsbase/vcsbaseplugin.h
index ed60b866ad..5df80930ee 100644
--- a/src/plugins/vcsbase/vcsbaseplugin.h
+++ b/src/plugins/vcsbase/vcsbaseplugin.h
@@ -151,6 +151,8 @@ public:
     // requires a terminal-less process) and sets LANG to 'C' to force English
     // (suppress LOCALE warnings/parse commands output) if desired.
     static void setProcessEnvironment(QProcessEnvironment *e, bool forceCLocale);
+    // Returns SSH prompt configured in settings.
+    static QString sshPrompt();
     // Returns whether an SSH prompt is configured.
     static bool isSshPromptConfigured();
 
@@ -175,6 +177,7 @@ public:
                                                     const QStringList &arguments,
                                                     int timeOutMS,
                                                     QProcessEnvironment env,
+                                                    const QString &sshPasswordPrompt,
                                                     unsigned flags = 0,
                                                     QTextCodec *outputCodec = 0);
 
@@ -182,6 +185,7 @@ public:
                                                     const QString &binary,
                                                     const QStringList &arguments,
                                                     int timeOutMS,
+                                                    const QString &sshPasswordPrompt,
                                                     unsigned flags = 0,
                                                     QTextCodec *outputCodec = 0);
 
@@ -241,6 +245,20 @@ private slots:
     void slotTestRemoveSnapshot();
 
 private:
+    static void setProcessEnvironment(QProcessEnvironment *e,
+                                      bool forceCLocale,
+                                      const QString &sshPasswordPrompt);
+
+    static Utils::SynchronousProcessResponse runVcsFullySynchronously(
+            const QString &workingDir,
+            const QString &binary,
+            const QStringList &arguments,
+            int timeOutMS,
+            QProcessEnvironment env,
+            const QString &sshPasswordPrompt,
+            unsigned flags,
+            QTextCodec *outputCodec = 0);
+
     VcsBasePluginPrivate *d;
 };