t9301: Add 2nd testcase exposing bugs in fast-import's notes fanout handling

The previous patch exposed a bug in fast-import where _removing_ an existing
note fails (when that note resides on a non-zero fanout level, and was added
prior to this fast-import run).

This patch demostrates the same issue when _changing_ an existing note
(subject to the same circumstances).

Discovered-by: Henrik Grubbström <grubba@roxen.com>
Signed-off-by: Johan Herland <johan@herland.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t9301-fast-import-notes.sh b/t/t9301-fast-import-notes.sh
index fd081616847caec123f70a5839248c11db09c160..57d85a635da6da98643a87a323d83833f03255a2 100755 (executable)
--- a/t/t9301-fast-import-notes.sh
+++ b/t/t9301-fast-import-notes.sh
@@ -505,6 +505,60 @@ test_expect_success 'verify that non-notes are untouched by a fanout change' '
        test_cmp expect_non-note3 actual
 
 '
+
+# Change the notes for the three top commits
+test_tick
+cat >input <<INPUT_END
+commit refs/notes/many_notes
+committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE
+data <<COMMIT
+changing notes for the top three commits
+COMMIT
+from refs/notes/many_notes^0
+INPUT_END
+
+rm expect
+i=$num_commits
+j=0
+while test $j -lt 3
+do
+       cat >>input <<INPUT_END
+N inline refs/heads/many_commits~$j
+data <<EOF
+changed note for commit #$i
+EOF
+INPUT_END
+       cat >>expect <<EXPECT_END
+    commit #$i
+    changed note for commit #$i
+EXPECT_END
+       i=$(($i - 1))
+       j=$(($j + 1))
+done
+
+test_expect_failure 'change a few existing notes' '
+
+       git fast-import <input &&
+       GIT_NOTES_REF=refs/notes/many_notes git log -n3 refs/heads/many_commits |
+           grep "^    " > actual &&
+       test_cmp expect actual
+
+'
+
+test_expect_failure 'verify that changing notes respect existing fanout' '
+
+       # None of the entries in the top-level notes tree should be a full SHA1
+       git ls-tree --name-only refs/notes/many_notes |
+       while read path
+       do
+               if test $(expr length "$path") -ge 40
+               then
+                       return 1
+               fi
+       done
+
+'
+
 remaining_notes=10
 test_tick
 cat >input <<INPUT_END