[PATCH] filter-branch: when dwim'ing a ref, only allow heads and tags

Previously, we matched all refs that had /$ref in them.  And tried to
verify the result as a ref.  If more than one match was found, the result
was not a ref, though.

So only allow tags and heads to be dwim'ed.  If both a tag and a head with
that name exist, it will be ignored again.

Caught by Johannes Sixt.

Signed-off-by: Johannes Schindelin <redacted>
---

	Heh.  I just realised that I managed to fsck up a one-line patch.  
	D'oh!  Thanks for fixing it, Hannes.

 git-filter-branch.sh     |    2 +-
 t/t7003-filter-branch.sh |    5 +++++
 2 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index 0ff3475..4fb3abe 100755
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh

@@ -193,7 +193,7 @@ do
 	;;
 	*)
 		ref="$(git for-each-ref --format='%(refname)' |
-			grep /"$ref")"
+			grep -e "^refs/heads/$ref$" -e "^refs/tags/$ref$")"
 	esac
 
 	git check-ref-format "$ref" && echo "$ref"

diff --git a/t/t7003-filter-branch.sh b/t/t7003-filter-branch.sh
index bc6e2dd..c9a820d 100755
--- a/t/t7003-filter-branch.sh
+++ b/t/t7003-filter-branch.sh

@@ -159,4 +159,9 @@ test_expect_success 'barf on invalid name' '
 	! git filter-branch -f HEAD^
 '
 
+test_expect_success 'only dwim refs/heads/$ref or refs/tags/$ref' '
+	git update-ref refs/remotes/origin/master HEAD &&
+	git filter-branch -f master
+'
+
 test_done

-- 
1.5.3.rc2.32.g35c5b-dirty