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sha1-file: introduce no-lazy-fetch has_object()

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There have been a few bugs wherein Git fetches missing objects whenever
the existence of an object is checked, even though it does not need to
perform such a fetch. To resolve these bugs, we could look at all the
places that has_object_file() (or a similar function) is used. As a
first step, introduce a new function has_object() that checks for the
existence of an object, with a default behavior of not fetching if the
object is missing and the repository is a partial clone. As we verify
each has_object_file() (or similar) usage, we can replace it with
has_object(), and we will know that we are done when we can delete
has_object_file() (and the other similar functions).

Also, the new function has_object() has more appropriate defaults:
besides not fetching, it also does not recheck packed storage.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jonathan Tan
2020-08-05 16:06:49 -07:00
committed by Junio C Hamano
parent dc04167d37
commit 1d8d9cb620
2 changed files with 35 additions and 2 deletions
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sha1-file.c
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@ -1989,6 +1989,18 @@ int force_object_loose(const struct object_id *oid, time_t mtime)
return ret;
}
int has_object(struct repository *r, const struct object_id *oid,
unsigned flags)
{
int quick = !(flags & HAS_OBJECT_RECHECK_PACKED);
unsigned object_info_flags = OBJECT_INFO_SKIP_FETCH_OBJECT |
(quick ? OBJECT_INFO_QUICK : 0);
if (!startup_info->have_repository)
return 0;
return oid_object_info_extended(r, oid, NULL, object_info_flags) >= 0;
}
int repo_has_object_file_with_flags(struct repository *r,
const struct object_id *oid, int flags)
{