[PATCH v2 3/3] tag: don't emit potentially incorrect "object is a X, not a Y"

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

As noted in the preceding commit we weren't handling cases where we
see a reference to a bad "type" in a "tag", but then end up not fully
parsing the object.

In those cases let's only claim that we have a bad tag pointer, but
emit "is a %s, not a %s".

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 t/t6102-rev-list-unexpected-objects.sh | 4 ++--
 tag.c                                  | 5 +++--
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/t/t6102-rev-list-unexpected-objects.sh b/t/t6102-rev-list-unexpected-objects.sh
index 590e2523d0c..98e36e73698 100755
--- a/t/t6102-rev-list-unexpected-objects.sh
+++ b/t/t6102-rev-list-unexpected-objects.sh
@@ -231,7 +231,7 @@ test_expect_success !SANITIZE_LEAK 'traverse unexpected non-tag tag (tree seen t
 '
 
 
-test_expect_failure !SANITIZE_LEAK 'traverse unexpected objects with for-each-ref' '
+test_expect_success !SANITIZE_LEAK 'traverse unexpected objects with for-each-ref' '
 	cat >expect <<-EOF &&
 	error: bad tag pointer to $tree in $tag_tag_tree
 	fatal: parse_object_buffer failed on $tag_tag_tree for refs/tags/tag_tag_tree
@@ -251,7 +251,7 @@ test_expect_success 'setup: unexpected objects with fsck' '
 
 while read oid type
 do
-	test_expect_failure "fsck knows unexpected object $oid is $type" '
+	test_expect_success "fsck knows unexpected object $oid is $type" '
 		git cat-file -t $oid >expect &&
 		echo $type >actual &&
 		test_cmp expect actual
diff --git a/tag.c b/tag.c
index 19453c2edbf..ad92cf89209 100644
--- a/tag.c
+++ b/tag.c
@@ -193,8 +193,9 @@ int parse_tag_buffer(struct repository *r, struct tag *item, const void *data, u
 	}
 
 	if (!item->tagged || strcmp(type_name(item->tagged->type), type)) {
-		error(_("object %s is a %s, not a %s"), oid_to_hex(&oid),
-		      type_name(item->tagged->type), type);
+		if (item->tagged && item->tagged->parsed)
+			error(_("object %s is a %s, not a %s"), oid_to_hex(&oid),
+			      type_name(item->tagged->type), type);
 		return error("bad tag pointer to %s in %s",
 			     oid_to_hex(&oid),
 			     oid_to_hex(&item->object.oid));
-- 
2.39.0.1153.g589e4efe9dc