Re: Super long branch names corrupt `.git/config`

[Jeff King <peff@peff.net>]

On Thu, Oct 04, 2012 at 12:28:39PM -0700, Junio C Hamano wrote:

> Ben Olive <sionide21@gmail.com> writes:
> 
> > My `.git/config` can be corrupted if I try to get a local branch with
> > an extremely long name to track a remote branch.
> >
> > Here is a (contrived) example to reproduce the issue:
> 
> Don't do that, then ;-)
> 
> I think we have a change that is already cooking.
> 
> Ben (Walton), want to add a test for your 0971e99 (Remove the hard
> coded length limit on variable names in config files, 2012-09-30)
> before it hits 'next', perhaps?

I came up with this test earlier today when responding in this thread:

diff --git a/t/t7201-co.sh b/t/t7201-co.sh
index be9672e..a32ecd9 100755
--- a/t/t7201-co.sh
+++ b/t/t7201-co.sh
@@ -454,6 +454,11 @@ test_expect_success \
     'checkout with --track, but without -b, fails with too short tracked name' '
     test_must_fail git checkout --track renamer'
 
+test_expect_success 'checkout tracking with long branch name' '
+	z200=$_z40$_z40$_z40$_z40$_z40
+	git checkout --track -b foo-$z200
+'
+
 setup_conflicting_index () {
 	rm -f .git/index &&
 	O=$(echo original | git hash-object -w --stdin) &&

but it feels a little fake. Why 200? Because that will test the config
limit, but will not overflow the NAME_MAX limit (at least not on
Linux! No clue on other platforms) when we try to create
refs/heads/foo-$z200.

So while this is a nice concrete user-visible impact of Ben's patch, I
think it is a little flaky to be testing. We should probably have a
straight config test in t1303, though.

-Peff