Jeff King <peff@xxxxxxxx> writes: > On Fri, Oct 13, 2017 at 02:11:32PM +0900, Junio C Hamano wrote: > >> strbuf_check_branch_ref() is the central place where many codepaths >> see if a proposed name is suitable for the name of a branch. It was >> designed to allow us to get stricter than the check_refname_format() >> check used for refnames in general, and we already use it to reject >> a branch whose name begins with a '-'. >> >> Use it to also reject "HEAD" as a branch name. > > Heh, I just pointed somebody to this a day or two ago as #leftoverbit. I > guess it's taken now. :) Didn't notice /remember it; sorry about that. I can retract it if you want, but perhaps they cannot unsee it ;-) >> diff --git a/t/t1430-bad-ref-name.sh b/t/t1430-bad-ref-name.sh >> index e88349c8a0..3ecb2eab0c 100755 >> --- a/t/t1430-bad-ref-name.sh >> +++ b/t/t1430-bad-ref-name.sh >> @@ -331,4 +331,12 @@ test_expect_success 'update-ref --stdin -z fails delete with bad ref name' ' >> grep "fatal: invalid ref format: ~a" err >> ' >> >> +test_expect_success 'branch rejects HEAD as a branch name' ' >> + test_must_fail git branch HEAD HEAD^ >> +' >> + >> +test_expect_success 'checkout -b rejects HEAD as a branch name' ' >> + test_must_fail git checkout -B HEAD HEAD^ >> +' > > Should we test that: > > git update-ref refs/heads/HEAD HEAD^ > > continues to work? Perhaps. Also we may want to make sure that "git branch -D HEAD" still works as a way to recover from historical mistakes.
