diff mbox series

[v7,09/17] object-file.c: don't set "typep" when returning non-zero

Message ID patch-v7-09.17-d9f5adfc74b-20210920T190305Z-avarab@gmail.com (mailing list archive)
State Superseded
Headers show
Series fsck: lib-ify object-file.c & better fsck "invalid object" error reporting | expand

Commit Message

Ævar Arnfjörð Bjarmason Sept. 20, 2021, 7:04 p.m. UTC 
When the loose_object_info() function returns an error stop faking up
the "oi->typep" to OBJ_BAD. Let the return value of the function
itself suffice. This code cleanup simplifies subsequent changes.

That we set this at all is a relic from the past. Before
052fe5eaca9 (sha1_loose_object_info: make type lookup optional,
2013-07-12) we would always return the type_from_string(type) via the
parse_sha1_header() function, or -1 (i.e. OBJ_BAD) if we couldn't
parse it.

Then in a combination of 46f034483eb (sha1_file: support reading from
a loose object of unknown type, 2015-05-03) and
b3ea7dd32d6 (sha1_loose_object_info: handle errors from
unpack_sha1_rest, 2017-10-05) our API drifted even further towards
conflating the two again.

Having read the code paths involved carefully I think this is OK. We
are just about to return -1, and we have only one caller:
do_oid_object_info_extended(). That function will in turn go on to
return -1 when we return -1 here.

This might be introducing a subtle bug where a caller of
oid_object_info_extended() would inspect its "typep" and expect a
meaningful value if the function returned -1.

Such a problem would not occur for its simpler oid_object_info()
sister function. That one always returns the "enum object_type", which
in the case of -1 would be the OBJ_BAD.

Having read the code for all the callers of these functions I don't
believe any such bug is being introduced here, and in any case we'd
likely already have such a bug for the "sizep" member (although
blindly checking "typep" first would be a more common case).

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 object-file.c | 2 --
 1 file changed, 2 deletions(-)
diff mbox series

Patch

diff --git a/object-file.c b/object-file.c
index a8be8994814..bda3497d5ca 100644
--- a/object-file.c
+++ b/object-file.c
@@ -1503,8 +1503,6 @@  static int loose_object_info(struct repository *r,
 		git_inflate_end(&stream);
 
 	munmap(map, mapsize);
-	if (status && oi->typep)
-		*oi->typep = status;
 	if (oi->sizep == &size_scratch)
 		oi->sizep = NULL;
 	strbuf_release(&hdrbuf);