revision.c: ignore broken tags with ignore_missing_links

When peeling a tag for prepare_revision_walk(), we do not
respect the ignore_missing_links flag. This can lead to a
bogus error when pack-objects walks the possibly-broken
unreachable-but-recent part of the object graph.

The other link-following all happens via traverse_commit_list(),
which explains why this case was missed. And our tests
covered only broken links from commits. Let's be more
comprehensive and cover broken tree entries (which do work)
and tags (which shows off this bug).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/revision.c b/revision.c
index 8a29cb0..7d57d44 100644 (file)
--- a/revision.c
+++ b/revision.c
@@ -230,7 +230,7 @@ static struct commit *handle_commit(struct rev_info *revs,
                        die("bad tag");
                object = parse_object(tag->tagged->oid.hash);
                if (!object) {
-                       if (flags & UNINTERESTING)
+                       if (revs->ignore_missing_links || (flags & UNINTERESTING))
                                return NULL;
                        die("bad object %s", oid_to_hex(&tag->tagged->oid));
                }

diff --git a/t/t6501-freshen-objects.sh b/t/t6501-freshen-objects.sh
index cf076dc..394b169 100755 (executable)
--- a/t/t6501-freshen-objects.sh
+++ b/t/t6501-freshen-objects.sh
@@ -129,7 +129,7 @@ for repack in '' true; do
        '
 done
 
-test_expect_success 'do not complain about existing broken links' '
+test_expect_success 'do not complain about existing broken links (commit)' '
        cat >broken-commit <<-\EOF &&
        tree 0000000000000000000000000000000000000001
        parent 0000000000000000000000000000000000000002
@@ -144,4 +144,29 @@ test_expect_success 'do not complain about existing broken links' '
        test_must_be_empty stderr
 '
 
+test_expect_success 'do not complain about existing broken links (tree)' '
+       cat >broken-tree <<-\EOF &&
+       100644 blob 0000000000000000000000000000000000000003    foo
+       EOF
+       tree=$(git mktree --missing <broken-tree) &&
+       git gc 2>stderr &&
+       git cat-file -e $tree &&
+       test_must_be_empty stderr
+'
+
+test_expect_success 'do not complain about existing broken links (tag)' '
+       cat >broken-tag <<-\EOF &&
+       object 0000000000000000000000000000000000000004
+       type commit
+       tag broken
+       tagger whatever <whatever@example.com> 1234 -0000
+
+       this is a broken tag
+       EOF
+       tag=$(git hash-object -t tag -w broken-tag) &&
+       git gc 2>stderr &&
+       git cat-file -e $tag &&
+       test_must_be_empty stderr
+'
+
 test_done