[PATCH] request-pull: resurrect for-linus -> tags/for-linus DWIM

[Junio C Hamano <gitster@pobox.com>]

Older versions of Git before v1.7.10 did not DWIM

    $ git pull $URL for-linus

to the tag "tags/for-linus" and the users were required to say

    $ git pull $URL tags/for-linus

instead.  Because newer versions of Git works either way,
request-pull used to show tags/for-linus when asked

    $ git request-pull origin/master $URL for-linus

The recent updates broke this and in the output we see "for-linus"
without the "tags/" prefix.

As v1.7.10 is more than 2 years old, this should matter very little
in practice, but resurrecting it is very simple.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

 * I _think_ the fix, without breaking the spirit of Linus's "I do
   not want the thing DWIM based on what the remote end has"
   original, would be as simple as this patch.  We can queue it as a
   regression fix and do another round of -rc4 if those who depend
   on request-pull heavily feel strongly about it.

 git-request-pull.sh     | 6 ++++++
 t/t5150-request-pull.sh | 8 +++++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/git-request-pull.sh b/git-request-pull.sh
index b67513a..d6648b2 100755
--- a/git-request-pull.sh
+++ b/git-request-pull.sh
@@ -118,6 +118,12 @@ then
 	status=1
 fi
 
+# Special case: turn "for_linus" to "tags/for_linus" when it is correct
+if test "$ref" = "refs/tags/$pretty_remote"
+then
+	pretty_remote=tags/$pretty_remote
+fi
+
 url=$(git ls-remote --get-url "$url")
 
 git show -s --format='The following changes since commit %H:
diff --git a/t/t5150-request-pull.sh b/t/t5150-request-pull.sh
index 75d6b38..93e2c65 100755
--- a/t/t5150-request-pull.sh
+++ b/t/t5150-request-pull.sh
@@ -223,7 +223,13 @@ test_expect_success 'pull request format' '
 		git request-pull initial "$downstream_url" tags/full:refs/tags/full
 	) >request &&
 	sed -nf fuzz.sed <request >request.fuzzy &&
-	test_i18ncmp expect request.fuzzy
+	test_i18ncmp expect request.fuzzy &&
+
+	(
+		cd local &&
+		git request-pull initial "$downstream_url" full
+	) >request &&
+	grep ' tags/full$'
 '
 
 test_expect_success 'request-pull ignores OPTIONS_KEEPDASHDASH poison' '
-- 
2.0.0-rc3-434-g1ba2fe8