Implement syncing of theme preferences between SDDM and Plasma

Summary:
This patch exposes UI options in sddm-kcm which enable users to sync their theme preferences used in Plasma with SDDM.

Syncing of UI font, font rendering, color scheme, desktop and icon theme has been implemented.

A reset button has also been added in order to allow easy removal of all SDDM syncing-related customization.

Test Plan:
For testing a different font, you need to have a file like this one:
{F6952969}
in `/home/user/.config/fontconfig/conf.d/`

Settings UI:
{F7052980}

Reviewers: #plasma, ngraham, davidedmundson, #vdg

Reviewed By: ngraham, #vdg

Subscribers: leinir, cfeck, GB_2, ndavis, plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D22191

kcm_sddm.actions

@@ -295,3 +295,15 @@ Description[zh_CN]=移除已经安装的 SDDM 主题
 Description[zh_TW]=移除先前安裝的 SDDM 主題
 Policy=auth_admin
 Persistence=session
+
+[org.kde.kcontrol.kcmsddm.sync]
+Name=Synchronize Settings
+Description=Synchronizes user settings with SDDM settings
+Policy=auth_admin
+Persistence=session
+
+[org.kde.kcontrol.kcmsddm.reset]
+Name=Reset Settings
+Description=Resets SDDM settings so there are not user settings
+Policy=auth_admin
+Persistence=session

sddmauthhelper.cpp

@@ -17,6 +17,8 @@
  */
 #include "sddmauthhelper.h"
 
+#include <unistd.h>
+
 #include <QDebug>
 #include <QDir>
 #include <QFile>
@@ -30,6 +32,7 @@
 #include <KConfigGroup>
 #include <KLocalizedString>
 #include <KTar>
+#include <KUser>
 #include <KZip>
 
 static QSharedPointer<KConfig> openConfig(const QString &filePath)
@@ -46,6 +49,86 @@ static QSharedPointer<KConfig> openConfig(const QString &filePath)
     return QSharedPointer<KConfig>(new KConfig(file.fileName(), KConfig::SimpleConfig));
 }
 
+void SddmAuthHelper::copyFile(const QString &source, const QString &destination)
+{
+    KUser sddmUser(QStringLiteral("sddm"));
+
+    if (QFile::exists(destination)) {
+        QFile::remove(destination);
+    }
+
+    QFile::copy(source, destination);
+    const char* destinationConverted = destination.toLocal8Bit().data();
+    if (chown(destinationConverted, sddmUser.userId().nativeId(), sddmUser.groupId().nativeId())) {
+        return;
+    }
+}
+
+ActionReply SddmAuthHelper::sync(const QVariantMap &args)
+{
+    QDir sddmConfigLocation(args[QStringLiteral("sddmUserConfig")].toString());
+    if (!sddmConfigLocation.exists()) {
+        QDir().mkpath(sddmConfigLocation.path());
+    }
+
+    // copy fontconfig (font, font rendering)
+    if (!args[QStringLiteral("fontconfig")].isNull()) {
+        QDir fontconfigSource(args[QStringLiteral("fontconfig")].toString());
+        QStringList sourceFileEntries = fontconfigSource.entryList (QDir::Files);
+        QStringList sourceDirEntries = fontconfigSource.entryList (QDir::AllDirs);
+        QDir fontconfigDestination(sddmConfigLocation.path() + QStringLiteral("/fontconfig"));
+
+        if (!fontconfigDestination.exists()) {
+            QDir().mkpath(fontconfigDestination.path());
+        }
+
+        if (sourceDirEntries.count() != 0) {
+            for (int i = 0; i<sourceDirEntries.count(); i++) {
+                QString directoriesSource = fontconfigSource.path() + QDir::separator() + sourceDirEntries[i];
+                QString directoriesDestination = fontconfigDestination.path() + QDir::separator() + sourceDirEntries[i];
+                fontconfigSource.mkpath(directoriesDestination);
+                copyFile(directoriesSource, directoriesDestination);
+            }
+        }
+
+        if (sourceFileEntries.count() != 0) {
+            for (int i = 0; i<sourceFileEntries.count(); i++) {
+                QString filesSource = fontconfigSource.path() + QDir::separator() + sourceFileEntries[i];
+                QString filesDestination = fontconfigDestination.path() + QDir::separator() + sourceFileEntries[i];
+                copyFile(filesSource, filesDestination);
+            }
+        }
+    }
+
+    // copy kdeglobals (color scheme)
+    if (!args[QStringLiteral("kdeglobals")].isNull()) {
+        QDir kdeglobalsSource(args[QStringLiteral("kdeglobals")].toString());
+        QDir kdeglobalsDestination(sddmConfigLocation.path() + QStringLiteral("/kdeglobals"));
+        copyFile(kdeglobalsSource.path(), kdeglobalsDestination.path());
+    }
+
+    // copy plasmarc (icons, UI style)
+    if (!args[QStringLiteral("plasmarc")].isNull()) {
+        QDir plasmarcSource(args[QStringLiteral("plasmarc")].toString());
+        QDir plasmarcDestination(sddmConfigLocation.path() + QStringLiteral("/plasmarc"));
+        copyFile(plasmarcSource.path(), plasmarcDestination.path());
+    }
+
+    return ActionReply::SuccessReply();
+}
+
+ActionReply SddmAuthHelper::reset(const QVariantMap &args)
+{
+    QDir sddmConfigLocation(args[QStringLiteral("sddmUserConfig")].toString());
+    QDir fontconfigDir(args[QStringLiteral("sddmUserConfig")].toString() + QStringLiteral("/fontconfig"));
+
+    fontconfigDir.removeRecursively();
+    QFile::remove(sddmConfigLocation.path() + QStringLiteral("/kdeglobals"));
+    QFile::remove(sddmConfigLocation.path() + QStringLiteral("/plasmarc"));
+
+    return ActionReply::SuccessReply();
+}
+
 ActionReply SddmAuthHelper::save(const QVariantMap &args)
 {
     ActionReply reply = ActionReply::HelperErrorReply();
@@ -76,7 +159,7 @@ ActionReply SddmAuthHelper::save(const QVariantMap &args)
 
         // if there is an identical keyName in "sddm.conf" we want to delete it so SDDM doesn't read from the old file
         // hierarchically SDDM prefers "etc/sddm.conf" to "/etc/sddm.conf.d/some_file.conf"
-        
+
         if (fileName == QLatin1String("kde_settings.conf")) {
             sddmConfig->group(groupName).writeEntry(keyName, iterator.value());
             sddmOldConfig->group(groupName).deleteEntry(keyName);
@@ -230,8 +313,6 @@ ActionReply SddmAuthHelper::uninstalltheme(const QVariantMap &args)
     return ActionReply::SuccessReply();
 }
 
-
 KAUTH_HELPER_MAIN("org.kde.kcontrol.kcmsddm", SddmAuthHelper)
 
 #include "moc_sddmauthhelper.cpp"
-

sddmauthhelper.h

@@ -24,10 +24,16 @@ using namespace KAuth;
 class SddmAuthHelper: public QObject
 {
     Q_OBJECT
+
 public Q_SLOTS:
+    ActionReply sync(const QVariantMap &args);
+    ActionReply reset(const QVariantMap &args);
     ActionReply save(const QVariantMap &args);
     ActionReply installtheme(const QVariantMap &args);
     ActionReply uninstalltheme(const QVariantMap &args);
+
+public:
+    void copyFile (const QString &source, const QString &destination);
 };
 
 #endif //SDDMAUTHHELPER_H

src/advanceconfig.cpp

@@ -24,9 +24,14 @@
 #include "usersmodel.h"
 
 #include <QDebug>
+#include <QFontDatabase>
 #include <QIntValidator>
+#include <QStandardPaths>
 
+#include <KAuth/KAuthActionReply>
+#include <kauthexecutejob.h>
 #include <KConfigGroup>
+#include <KMessageBox>
 #include <KUser>
 
 const int MIN_UID = 1000;
@@ -38,6 +43,7 @@ AdvanceConfig::AdvanceConfig(const KSharedConfigPtr &config, QWidget *parent) :
 {
     configUi = new Ui::AdvanceConfig();
     configUi->setupUi(this);
+    configUi->syncExplanation->setFont(QFontDatabase::systemFont(QFontDatabase::SmallestReadableFont));
 
     load();
 
@@ -54,6 +60,9 @@ AdvanceConfig::AdvanceConfig(const KSharedConfigPtr &config, QWidget *parent) :
     // manually emit changed signal since QCheckBox::clicked will pass false to changed() when unchecked
     connect(configUi->autoLogin, &QCheckBox::clicked, this, [this] { emit changed(); });
     connect(configUi->reloginAfterQuit, &QAbstractButton::clicked, this, [this] { emit changed(); });
+
+    connect(configUi->syncSettings, &QPushButton::clicked, this, &AdvanceConfig::syncSettingsChanged);
+    connect(configUi->resetSettings, &QPushButton::clicked, this, &AdvanceConfig::resetSettingsChanged);
 }
 
 AdvanceConfig::~AdvanceConfig()
@@ -160,3 +169,69 @@ bool AdvanceConfig::isUidRangeValid(int minUid, int maxUid) const
 
     return true;
 }
+
+void AdvanceConfig::syncSettingsChanged()
+{
+    const QString fontconfigPath = QStandardPaths::locate(QStandardPaths::GenericConfigLocation, QStringLiteral("fontconfig"), QStandardPaths::LocateDirectory);
+    const QString kdeglobalsPath = QStandardPaths::locate(QStandardPaths::GenericConfigLocation, QStringLiteral("kdeglobals"));
+    const QString plasmarcPath = QStandardPaths::locate(QStandardPaths::GenericConfigLocation, QStringLiteral("plasmarc"));
+    const QString sddmUserConfigPath = KUser("sddm").homeDir() + QStringLiteral("/.config");
+
+    if (fontconfigPath.isEmpty()) {
+        qDebug() << "fontconfig folder not found";
+    }
+    if (kdeglobalsPath.isEmpty()) {
+        qDebug() << "kdeglobals file not found";
+    }
+    if (plasmarcPath.isEmpty()) {
+        qDebug() << "plasmarc file not found";
+    }
+
+    QVariantMap args;
+    args[QStringLiteral("fontconfig")] = fontconfigPath;
+    args[QStringLiteral("kdeglobals")] = kdeglobalsPath;
+    args[QStringLiteral("plasmarc")] = plasmarcPath;
+    args[QStringLiteral("sddmUserConfig")] = sddmUserConfigPath;
+
+    KAuth::Action syncAction(QStringLiteral("org.kde.kcontrol.kcmsddm.sync"));
+    syncAction.setHelperId(QStringLiteral("org.kde.kcontrol.kcmsddm"));
+    syncAction.setArguments(args);
+
+    auto job = syncAction.execute();
+    job->exec();
+
+    if (job->error()){
+        qDebug() << "Synchronization failed";
+        qDebug() << job->errorString();
+        qDebug() << job->errorText();
+        KMessageBox::error(this, job->errorText());
+    } else {
+        changed(false);
+        qDebug() << "Synchronization successful";
+    }
+}
+
+void AdvanceConfig::resetSettingsChanged()
+{
+    const QString sddmUserConfigPath = KUser("sddm").homeDir() + QStringLiteral("/.config");
+
+    QVariantMap args;
+    args[QStringLiteral("sddmUserConfig")] = sddmUserConfigPath;
+
+    KAuth::Action resetAction(QStringLiteral("org.kde.kcontrol.kcmsddm.reset"));
+    resetAction.setHelperId(QStringLiteral("org.kde.kcontrol.kcmsddm"));
+    resetAction.setArguments(args); 
+
+    auto job = resetAction.execute();
+    job->exec();
+
+    if (job->error()){
+        qDebug() << "Reset failed";
+        qDebug() << job->errorString();
+        qDebug() << job->errorText();
+        KMessageBox::error(this, job->errorText());
+    } else {
+        changed(false);
+        qDebug() << "Reset successful";
+    }
+}

src/advanceconfig.h

@@ -41,6 +41,10 @@ class AdvanceConfig : public QWidget
 Q_SIGNALS:
     void changed(bool changed=true);
 
+public Q_SLOTS:
+    void syncSettingsChanged();
+    void resetSettingsChanged();
+
 private Q_SLOTS:
     void slotUidRangeChanged();