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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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25
object-store.h
View File

@ -239,12 +239,33 @@ int read_loose_object(const char *path,
unsigned long *size,
void **contents);
/* Retry packed storage after checking packed and loose storage */
#define HAS_OBJECT_RECHECK_PACKED 1
/*
* Returns 1 if the object exists. This function will not lazily fetch objects
* in a partial clone.
*/
int has_object(struct repository *r, const struct object_id *oid,
unsigned flags);
/*
* These macros and functions are deprecated. If checking existence for an
* object that is likely to be missing and/or whose absence is relatively
* inconsequential (or is consequential but the caller is prepared to handle
* it), use has_object(), which has better defaults (no lazy fetch in a partial
* clone and no rechecking of packed storage). In the unlikely event that a
* caller needs to assert existence of an object that it fully expects to
* exist, and wants to trigger a lazy fetch in a partial clone, use
* oid_object_info_extended() with a NULL struct object_info.
*
* These functions can be removed once all callers have migrated to
* has_object() and/or oid_object_info_extended().
*/
#ifndef NO_THE_REPOSITORY_COMPATIBILITY_MACROS
#define has_sha1_file_with_flags(sha1, flags) repo_has_sha1_file_with_flags(the_repository, sha1, flags)
#define has_sha1_file(sha1) repo_has_sha1_file(the_repository, sha1)
#endif
/* Same as the above, except for struct object_id. */
int repo_has_object_file(struct repository *r, const struct object_id *oid);
int repo_has_object_file_with_flags(struct repository *r,
const struct object_id *oid, int flags);

12
sha1-file.c
View File

@ -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)
{