protected override bool tryLock(bool deref)
{
Ref dst = Ref;
if (deref)
{
dst = dst.getLeaf();
}
string name = dst.getName();
_lock = new LockFile(_database.fileFor(name));
if (_lock.Lock())
{
dst = _database.getRef(name);
OldObjectId = (dst != null ? dst.getObjectId() : null);
return(true);
}
else
{
return(false);
}
}
protected override RefUpdate.RefUpdateResult doRename()
{
if (source.getRef().isSymbolic())
{
return(RefUpdate.RefUpdateResult.IO_FAILURE); // not supported
}
var rw = new RevWalk.RevWalk(_refdb.getRepository());
_objId = source.getOldObjectId();
_updateHead = needToUpdateHEAD();
_tmp = _refdb.newTemporaryUpdate();
try
{
// First backup the source so its never unreachable.
_tmp.setNewObjectId(_objId);
_tmp.setForceUpdate(true);
_tmp.disableRefLog();
switch (_tmp.update(rw))
{
case RefUpdate.RefUpdateResult.NEW:
case RefUpdate.RefUpdateResult.FORCED:
case RefUpdate.RefUpdateResult.NO_CHANGE:
break;
default:
return(_tmp.getResult());
}
// 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.RefUpdateResult.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.RefUpdateResult.LOCK_FAILURE);
}
// Replace the update operation so HEAD will log the rename.
dst = _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.RefUpdateResult.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.RefUpdateResult.IO_FAILURE);
}
// Create the destination, logging the rename during the creation.
dst.setExpectedOldObjectId(ObjectId.ZeroId);
dst.setNewObjectId(_objId);
if (dst.update(rw) != RefUpdate.RefUpdateResult.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.RefUpdateResult.RENAMED);
}
finally
{
// Always try to free the temporary name.
try
{
_refdb.delete(_tmp);
}
catch (IOException)
{
_refdb.fileFor(_tmp.getName()).Delete();
}
}
}