Add option to run operations as specified user

If a user name is supplied, fork a child process that attempts to switch to
that user prior to performing the requested file operation.

Note that the process must have the CAP_SETGID capability for this to
succeed.

src/fileengine.cpp

@@ -76,9 +76,9 @@ bool FileEngine::busy() const
     return m_fileWorker->isRunning();
 }
 
-void FileEngine::deleteFiles(QStringList fileNames)
+void FileEngine::deleteFiles(QStringList fileNames, QString asUser)
 {
-    m_fileWorker->startDeleteFiles(fileNames);
+    m_fileWorker->startDeleteFiles(fileNames, asUser);
 }
 
 void FileEngine::cutFiles(QStringList fileNames)
@@ -108,7 +108,7 @@ void FileEngine::copyFiles(QStringList fileNames)
     }
 }
 
-void FileEngine::pasteFiles(QString destDirectory)
+void FileEngine::pasteFiles(QString destDirectory, QString asUser)
 {
     if (m_clipboardFiles.isEmpty()) {
         qmlInfo(this) << "Paste called with empty clipboard.";
@@ -149,11 +149,11 @@ void FileEngine::pasteFiles(QString destDirectory)
     emit clipboardCountChanged();
 
     if (m_clipboardContainsCopy) {
-        m_fileWorker->startCopyFiles(files, destDirectory);
+        m_fileWorker->startCopyFiles(files, destDirectory, asUser);
         return;
     }
 
-    m_fileWorker->startMoveFiles(files, destDirectory);
+    m_fileWorker->startMoveFiles(files, destDirectory, asUser);
 }
 
 void FileEngine::cancel()
@@ -170,21 +170,21 @@ bool FileEngine::exists(QString fileName)
     return QFile::exists(fileName);
 }
 
-bool FileEngine::mkdir(QString path, QString name)
+bool FileEngine::mkdir(QString path, QString name, QString asUser)
 {
-    if (!m_fileWorker->mkdir(path, name)) {
+    if (!m_fileWorker->mkdir(path, name, asUser)) {
         emit error(ErrorFolderCreationFailed, name);
         return false;
     }
     return true;
 }
 
-bool FileEngine::rename(QString fullOldFileName, QString newName)
+bool FileEngine::rename(QString fullOldFileName, QString newName, QString asUser)
 {
     QFileInfo fileInfo(fullOldFileName);
     QDir dir = fileInfo.absoluteDir();
     QString fullNewFileName = dir.absoluteFilePath(newName);
-    if (!m_fileWorker->rename(fullOldFileName, fullNewFileName)) {
+    if (!m_fileWorker->rename(fullOldFileName, fullNewFileName, asUser)) {
         emit error(ErrorRenameFailed, fileInfo.fileName());
         return false;
     }
@@ -194,7 +194,7 @@ bool FileEngine::rename(QString fullOldFileName, QString newName)
 bool FileEngine::chmod(QString path,
                       bool ownerRead, bool ownerWrite, bool ownerExecute,
                       bool groupRead, bool groupWrite, bool groupExecute,
-                      bool othersRead, bool othersWrite, bool othersExecute)
+                      bool othersRead, bool othersWrite, bool othersExecute, QString asUser)
 {
     QFileDevice::Permissions p;
     if (ownerRead) p |= QFileDevice::ReadOwner;
@@ -206,7 +206,7 @@ bool FileEngine::chmod(QString path,
     if (othersRead) p |= QFileDevice::ReadOther;
     if (othersWrite) p |= QFileDevice::WriteOther;
     if (othersExecute) p |= QFileDevice::ExeOther;
-    if (!m_fileWorker->setPermissions(path, p)) {
+    if (!m_fileWorker->setPermissions(path, p, asUser)) {
         emit error(ErrorChmodFailed, path);
         return false;
     }

src/fileengine.h

@@ -65,7 +65,8 @@ class FileEngine : public QObject
         ErrorCannotCopyIntoItself,
         ErrorFolderCopyFailed,
         ErrorFolderCreationFailed,
-        ErrorChmodFailed
+        ErrorChmodFailed,
+        ErrorUserChangeFailed
     };
 
     enum Mode {
@@ -84,22 +85,22 @@ class FileEngine : public QObject
     // methods accessible from QML
 
     // asynch methods send signals when done or error occurs
-    Q_INVOKABLE void deleteFiles(QStringList fileNames);
+    Q_INVOKABLE void deleteFiles(QStringList fileNames, QString asUser = QString());
     Q_INVOKABLE void cutFiles(QStringList fileNames);
     Q_INVOKABLE void copyFiles(QStringList fileNames);
-    Q_INVOKABLE void pasteFiles(QString destDirectory);
+    Q_INVOKABLE void pasteFiles(QString destDirectory, QString asUser = QString());
 
     // cancel asynch methods
     Q_INVOKABLE void cancel();
 
     // synchronous methods
     Q_INVOKABLE bool exists(QString fileName);
-    Q_INVOKABLE bool mkdir(QString path, QString name);
-    Q_INVOKABLE bool rename(QString fullOldFileName, QString newName);
+    Q_INVOKABLE bool mkdir(QString path, QString name, QString asUser = QString());
+    Q_INVOKABLE bool rename(QString fullOldFileName, QString newName, QString asUser = QString());
     Q_INVOKABLE bool chmod(QString path,
                               bool ownerRead, bool ownerWrite, bool ownerExecute,
                               bool groupRead, bool groupWrite, bool groupExecute,
-                              bool othersRead, bool othersWrite, bool othersExecute);
+                              bool othersRead, bool othersWrite, bool othersExecute, QString asUser = QString());
 
 
 signals: