t5700: document a failure of alternates to affect fetch

If an alternate supplies some, but not all, of the objects needed for
a fetch, fetch-pack nevertheless generates "want" lines for the
alternate objects that are present.  Demonstrate this problem via a
failing test.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t5700-clone-reference.sh b/t/t5700-clone-reference.sh
index c4c375ac042bbb7f58998c87d8c9277d2f5004a6..bd7a1d7dbbe40494ac250251b6543ce7153a6370 100755 (executable)
--- a/t/t5700-clone-reference.sh
+++ b/t/t5700-clone-reference.sh
@@ -52,13 +52,13 @@ test_cmp expected current'
 
 cd "$base_dir"
 
-rm -f "$U"
+rm -f "$U.D"
 
 test_expect_success 'cloning with reference (no -l -s)' \
-'GIT_DEBUG_SEND_PACK=3 git clone --reference B "file://$(pwd)/A" D 3>"$U"'
+'GIT_DEBUG_SEND_PACK=3 git clone --reference B "file://$(pwd)/A" D 3>"$U.D"'
 
 test_expect_success 'fetched no objects' \
-'! grep "^want" "$U"'
+'! grep "^want" "$U.D"'
 
 cd "$base_dir"
 
@@ -153,4 +153,32 @@ test_expect_success 'clone with reference from a tagged repository' '
        git clone --reference=A A I
 '
 
+test_expect_success 'prepare branched repository' '
+       git clone A J &&
+       (
+               cd J &&
+               git checkout -b other master^ &&
+               echo other >otherfile &&
+               git add otherfile &&
+               git commit -m other &&
+               git checkout master
+       )
+'
+
+rm -f "$U.K"
+
+test_expect_failure 'fetch with incomplete alternates' '
+       git init K &&
+       echo "$base_dir/A/.git/objects" >K/.git/objects/info/alternates &&
+       (
+               cd K &&
+               git remote add J "file://$base_dir/J" &&
+               GIT_DEBUG_SEND_PACK=3 git fetch J 3>"$U.K"
+       ) &&
+       master_object=$(cd A && git for-each-ref --format="%(objectname)" refs/heads/master) &&
+       ! grep "^want $master_object" "$U.K" &&
+       tag_object=$(cd A && git for-each-ref --format="%(objectname)" refs/tags/HEAD) &&
+       ! grep "^want $tag_object" "$U.K"
+'
+
 test_done