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GH-1060 add a lot of error checking and reporting to the inner updater

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This commit is contained in:
Petr Mrázek 2015-06-09 20:58:19 +02:00
parent 64b70acac1
commit 22c5ced5dc
1 changed files with 62 additions and 7 deletions
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69
application/MultiMC.cpp
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@ -679,6 +679,16 @@ void MultiMC::installUpdates(const QString updateFilesDir, GoUpdate::OperationLi
QString orig;
QString backup;
};
enum Failure
{
Copy,
Delete,
Start,
Nothing
} failedOperationType = Nothing;
QString failedFile;
QList <BackupEntry> backups;
QList <BackupEntry> trashcan;
for(auto op: operations)
@ -690,10 +700,12 @@ void MultiMC::installUpdates(const QString updateFilesDir, GoUpdate::OperationLi
QFileInfo replaced (PathCombine(root(), op.dest));
if(replaced.exists())
{
QString backupFilePath = PathCombine(backupPath, replaced.completeBaseName());
QString backupFilePath = PathCombine(backupPath, replaced.fileName());
if(!QFile::rename(replaced.absoluteFilePath(), backupFilePath))
{
qWarning() << "Couldn't rename:" << replaced.absoluteFilePath() << "to" << backupFilePath;
failedOperationType = Copy;
failedFile = op.dest;
goto FAILED;
}
BackupEntry be;
@ -701,9 +713,12 @@ void MultiMC::installUpdates(const QString updateFilesDir, GoUpdate::OperationLi
be.backup = backupFilePath;
backups.append(be);
}
// FIXME: use rename instead.
if(!QFile::copy(op.file, replaced.absoluteFilePath()))
{
qWarning() << "Couldn't copy:" << op.file << "to" << replaced.absoluteFilePath();
qWarning() << "CPY: Couldn't copy:" << op.file << "to" << replaced.absoluteFilePath();
failedOperationType = Copy;
failedFile = op.dest;
goto FAILED;
}
QFile::setPermissions(replaced.absoluteFilePath(), unixModeToPermissions(op.mode));
@ -715,7 +730,13 @@ void MultiMC::installUpdates(const QString updateFilesDir, GoUpdate::OperationLi
QString origFilePath = PathCombine(root(), op.file);
if(QFile::exists(origFilePath))
{
QFile::rename(origFilePath, trashFilePath);
if(!QFile::rename(origFilePath, trashFilePath))
{
qWarning() << "DEL: Couldn't move:" << op.file << "to" << trashFilePath;
failedFile = op.file;
failedOperationType = Delete;
goto FAILED;
}
BackupEntry be;
be.orig = origFilePath;
be.backup = trashFilePath;
@ -734,6 +755,7 @@ void MultiMC::installUpdates(const QString updateFilesDir, GoUpdate::OperationLi
if(!started || pid == -1)
{
qWarning() << "Couldn't start new process properly!";
failedOperationType = Start;
goto FAILED;
}
// now clean up the backed up stuff.
@ -750,19 +772,52 @@ void MultiMC::installUpdates(const QString updateFilesDir, GoUpdate::OperationLi
FAILED:
qWarning() << "Update failed!";
bool revertOK = true;
// if the above failed, roll back changes
for(auto backup:backups)
{
qWarning() << "restoring" << backup.orig << "from" << backup.backup;
QFile::remove(backup.orig);
QFile::rename(backup.backup, backup.orig);
if(!QFile::remove(backup.orig))
{
revertOK = false;
qWarning() << "removing new" << backup.orig << "failed!";
continue;
}
if(!QFile::rename(backup.backup, backup.orig))
{
revertOK = false;
qWarning() << "removing new" << backup.orig << "failed!";
}
}
for(auto backup:trashcan)
{
qWarning() << "restoring" << backup.orig << "from" << backup.backup;
QFile::rename(backup.backup, backup.orig);
revertOK &= QFile::rename(backup.backup, backup.orig);
}
// and do nothing
QString msg;
if(!revertOK)
{
msg = tr("The update failed and then the update revert failed too.\n"
"You will have to repair MultiMC manually.\n"
"Please let us know why and how this happened.").arg(failedFile);
}
else switch (failedOperationType)
{
case Copy:
msg = tr("Couldn't replace file %1. Changes were reverted.\nSee the MultiMC log file for details.").arg(failedFile);
break;
case Delete:
msg = tr("Couldn't remove file %1. Changes were reverted.\nSee the MultiMC log file for details.").arg(failedFile);
break;
case Start:
msg = tr("The new version didn't start and the update was rolled back.");
break;
case Nothing:
default:
return;
}
QMessageBox::critical(nullptr, tr("Update failed"), msg);
}
void MultiMC::setIconTheme(const QString& name)