Fix contrib/hooks/post-receive-email for new duplicate branch

In the show_new_revisions function, the original code:

  git rev-parse --not --branches | grep -v $(git rev-parse $refname) |

isn't quite right since one can create a new branch and push it
without any new commits.  In that case, two refs will have the same
sha1 but both would get filtered by the 'grep'.  In the end, we'll
show ALL the history which is not what we want.  Instead, we should
list the branches by name and remove the branch being updated and THEN
pass that list through rev-parse.

Revised as suggested by Jakub Narebski and Junio C Hamano to use
git-for-each-ref instead of git-branch.  (Thanks!)

Signed-off-by: Pat Notz <pknotz@sandia.gov>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/contrib/hooks/post-receive-email b/contrib/hooks/post-receive-email
index 28a3c0e46ecf9951f3f42a025a288a65c70e0424..60cbab65d3f8230be3041a13fac2fd9f9b3018d5 100644 (file)
--- a/contrib/hooks/post-receive-email
+++ b/contrib/hooks/post-receive-email
@@ -615,7 +615,9 @@ show_new_revisions()
                revspec=$oldrev..$newrev
        fi
 
-       git rev-parse --not --branches | grep -v $(git rev-parse $refname) |
+       other_branches=$(git for-each-ref --format='%(refname)' refs/heads/ |
+           grep -F -v $refname)
+       git rev-parse --not $other_branches |
        if [ -z "$custom_showrev" ]
        then
                git rev-list --pretty --stdin $revspec