[auth][bugfix] Migrate qgis-auth.db from QGIS 2 to 3

Fixes #17403

Author: elpaso

src/app/qgsversionmigration.cpp

@@ -23,6 +23,7 @@
 #include "qgsstyle.h"
 #include "qgssymbollayerutils.h"
 #include "qgsreadwritecontext.h"
+#include "qgsuserprofilemanager.h"
 
 #include <QFile>
 #include <QTextStream>
@@ -53,14 +54,32 @@ QgsVersionMigration *QgsVersionMigration::canMigrate( int fromVersion, int toVer
 
 QgsError Qgs2To3Migration::runMigration()
 {
-  QgsError error;
+  QgsError errors;
   QgsError settingsErrors = migrateSettings();
   if ( !settingsErrors.isEmpty() )
   {
-    // TODO Merge error messages
+    for ( const auto &err : settingsErrors.messageList( ) )
+    {
+      errors.append( err );
+    }
   }
-  QgsError stylesError = migrateStyles();
-  return error;
+  QgsError stylesErrors = migrateStyles();
+  if ( !stylesErrors.isEmpty() )
+  {
+    for ( const auto &err : stylesErrors.messageList( ) )
+    {
+      errors.append( err );
+    }
+  }
+  QgsError authDbErrors = migrateAuthDb();
+  if ( !authDbErrors.isEmpty() )
+  {
+    for ( const auto &err : authDbErrors.messageList( ) )
+    {
+      errors.append( err );
+    }
+  }
+  return errors;
 }
 
 bool Qgs2To3Migration::requiresMigration()
@@ -242,6 +261,50 @@ QgsError Qgs2To3Migration::migrateSettings()
   return error;
 }
 
+QgsError Qgs2To3Migration::migrateAuthDb()
+{
+  QgsError error;
+  QString oldHome = QStringLiteral( "%1/.qgis2" ).arg( QDir::homePath() );
+  QString oldAuthDbFilePath = QStringLiteral( "%1/qgis-auth.db" ).arg( oldHome );
+  // Try to retrieve the current profile folder (I didn't find an QgsApplication API for it)
+  QDir settingsDir = QFileInfo( QgsSettings().fileName() ).absoluteDir();
+  settingsDir.cdUp();
+  QString newAuthDbFilePath = QStringLiteral( "%1/qgis-auth.db" ).arg( settingsDir.absolutePath() );
+  // Do not overwrite!
+  if ( QFile( newAuthDbFilePath ).exists( ) )
+  {
+    QString msg = QString( "Could not copy old auth DB to %1: file already exists!" ).arg( newAuthDbFilePath );
+    QgsDebugMsg( msg );
+    error.append( msg );
+
+  }
+  else
+  {
+    QgsDebugMsg( QString( "OLD AUTH DB FILE %1" ).arg( oldAuthDbFilePath ) );
+    QFile oldDbFile( oldAuthDbFilePath );
+    if ( oldDbFile.exists( ) )
+    {
+      if ( oldDbFile.copy( newAuthDbFilePath ) )
+      {
+        QgsDebugMsg( QStringLiteral( "Old auth DB successfully copied to %1" ).arg( newAuthDbFilePath ) );
+      }
+      else
+      {
+        QString msg = QString( "Could not copy auth DB %1 to %2" ).arg( oldAuthDbFilePath, newAuthDbFilePath );
+        QgsDebugMsg( msg );
+        error.append( msg );
+      }
+    }
+    else
+    {
+      QString msg = QString( "Could not copy auth DB %1 to %2: old DB does not exists!" ).arg( oldAuthDbFilePath, newAuthDbFilePath );
+      QgsDebugMsg( msg );
+      error.append( msg );
+    }
+  }
+  return error;
+}
+
 QList<QPair<QString, QString> > Qgs2To3Migration::walk( QString group, QString newkey )
 {
   mOldSettings->beginGroup( group );

src/app/qgsversionmigration.h

@@ -58,6 +58,7 @@ class Qgs2To3Migration : public QgsVersionMigration
   private:
     QgsError migrateStyles();
     QgsError migrateSettings();
+    QgsError migrateAuthDb();
 
     QList<QPair<QString, QString>> walk( QString group, QString newkey );
     QPair<QString, QString> transformKey( QString fullOldKey, QString newKeyPart );