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Re: [jgit-dev] creating a new branch fails with LOCK_FAILURE if branch already exists
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Shawn Pearce skrev 2012-01-04 16.27:
On Wed, Jan 4, 2012 at 06:30, Kempin, Edwin<edwin.kempin@xxxxxxx> wrote:
this is how we create a new branch:
final RefUpdate u = repo.updateRef(refname);
u.setExpectedOldObjectId(ObjectId.zeroId());
u.setNewObjectId(object.copy());
u.setRefLogIdent(refLogIdent);
u.setRefLogMessage("some message", false);
final RefUpdate.Result result = u.update(rw);
switch (result) {
case FAST_FORWARD:
case NEW:
case NO_CHANGE:
// branch creation was successful
...
break;
default: {
throw new IOException(result.name());
}
}
When the branch creation fails because a branch with the name already exists LOCK_FAILURE is returned as result.
Yes. Because LOCK_FAILURE is returned when the reference's current
value does not match the expected old ObjectId. Using
ObjectId.zeroId() is only special in terms of looking for the
reference to not exist at all, otherwise it is treated the same as if
any other ObjectId was used and the reference no longer points at that
ObjectId.
I.e do not call setExpectedOldObjectId() at all to create the
branch regardless of whether it is new or not.
-- robin
