private bool RenameLog(RefUpdate src, RefUpdate dst)
{
FilePath srcLog = refdb.GetLogWriter().LogFor(src.GetName());
FilePath dstLog = refdb.GetLogWriter().LogFor(dst.GetName());
if (!srcLog.Exists())
{
return(true);
}
if (!Rename(srcLog, dstLog))
{
return(false);
}
try
{
int levels = RefDirectory.LevelsIn(src.GetName()) - 2;
RefDirectory.Delete(srcLog, levels);
return(true);
}
catch (IOException)
{
Rename(dstLog, srcLog);
return(false);
}
}
/// <exception cref="System.IO.IOException"></exception>
protected internal override RefUpdate.Result DoDelete(RefUpdate.Result status)
{
if (GetRef().GetLeaf().GetStorage() != RefStorage.NEW)
{
database.Delete(this);
}
return(status);
}
/// <exception cref="System.IO.IOException"></exception>
protected internal override RefUpdate.Result DoRename()
{
if (source.GetRef().IsSymbolic())
{
return(RefUpdate.Result.IO_FAILURE);
}
// not supported
objId = source.GetOldObjectId();
updateHEAD = NeedToUpdateHEAD();
tmp = refdb.NewTemporaryUpdate();
RevWalk rw = new RevWalk(refdb.GetRepository());
try
{
// First backup the source so its never unreachable.
tmp.SetNewObjectId(objId);
tmp.SetForceUpdate(true);
tmp.DisableRefLog();
switch (tmp.Update(rw))
{
case RefUpdate.Result.NEW:
case RefUpdate.Result.FORCED:
case RefUpdate.Result.NO_CHANGE:
{
break;
}
default:
{
return(tmp.GetResult());
break;
}
}
// Save the source's log under the temporary name, we must do
// this before we delete the source, otherwise we lose the log.
if (!RenameLog(source, tmp))
{
return(RefUpdate.Result.IO_FAILURE);
}
// If HEAD has to be updated, link it now to destination.
// We have to link before we delete, otherwise the delete
// fails because its the current branch.
RefUpdate dst = destination;
if (updateHEAD)
{
if (!LinkHEAD(destination))
{
RenameLog(tmp, source);
return(RefUpdate.Result.LOCK_FAILURE);
}
// Replace the update operation so HEAD will log the rename.
dst = ((RefDirectoryUpdate)refdb.NewUpdate(Constants.HEAD, false));
dst.SetRefLogIdent(destination.GetRefLogIdent());
dst.SetRefLogMessage(destination.GetRefLogMessage(), false);
}
// Delete the source name so its path is free for replacement.
source.SetExpectedOldObjectId(objId);
source.SetForceUpdate(true);
source.DisableRefLog();
if (source.Delete(rw) != RefUpdate.Result.FORCED)
{
RenameLog(tmp, source);
if (updateHEAD)
{
LinkHEAD(source);
}
return(source.GetResult());
}
// Move the log to the destination.
if (!RenameLog(tmp, destination))
{
RenameLog(tmp, source);
source.SetExpectedOldObjectId(ObjectId.ZeroId);
source.SetNewObjectId(objId);
source.Update(rw);
if (updateHEAD)
{
LinkHEAD(source);
}
return(RefUpdate.Result.IO_FAILURE);
}
// Create the destination, logging the rename during the creation.
dst.SetExpectedOldObjectId(ObjectId.ZeroId);
dst.SetNewObjectId(objId);
if (dst.Update(rw) != RefUpdate.Result.NEW)
{
// If we didn't create the destination we have to undo
// our work. Put the log back and restore source.
if (RenameLog(destination, tmp))
{
RenameLog(tmp, source);
}
source.SetExpectedOldObjectId(ObjectId.ZeroId);
source.SetNewObjectId(objId);
source.Update(rw);
if (updateHEAD)
{
LinkHEAD(source);
}
return(dst.GetResult());
}
return(RefUpdate.Result.RENAMED);
}
finally
{
// Always try to free the temporary name.
try
{
refdb.Delete(tmp);
}
catch (IOException)
{
FileUtils.Delete(refdb.FileFor(tmp.GetName()));
}
rw.Release();
}
}