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| author | Michael Haggerty <mhagger@alum.mit.edu> | 2013-06-20 10:37:46 +0200 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2013-06-20 15:50:17 -0700 |
| commit | 9f69d297703bff37c5506276c2565c721347e03f (patch) | |
| tree | e2a24bfaae82ea15b70fa15a443594483bccedae /refs.h | |
| parent | 2fff7812902abd0afe05ae1e9ef334fcd26f0389 (diff) | |
| download | git-9f69d297703bff37c5506276c2565c721347e03f.tar.gz | |
refs: implement simple transactions for the packed-refs file
Handle simple transactions for the packed-refs file at the
packed_ref_cache level via new functions lock_packed_refs(),
commit_packed_refs(), and rollback_packed_refs().
Only allow the packed ref cache to be modified (via add_packed_ref())
while the packed refs file is locked.
Change clone to add the new references within a transaction.
Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'refs.h')
| -rw-r--r-- | refs.h | 26 |
1 files changed, 24 insertions, 2 deletions
@@ -77,12 +77,34 @@ extern int for_each_rawref(each_ref_fn, void *); extern void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname); /* - * Add a reference to the in-memory packed reference cache. To actually - * write the reference to the packed-refs file, call pack_refs(). + * Lock the packed-refs file for writing. Flags is passed to + * hold_lock_file_for_update(). Return 0 on success. + */ +extern int lock_packed_refs(int flags); + +/* + * Add a reference to the in-memory packed reference cache. This may + * only be called while the packed-refs file is locked (see + * lock_packed_refs()). To actually write the packed-refs file, call + * commit_packed_refs(). */ extern void add_packed_ref(const char *refname, const unsigned char *sha1); /* + * Write the current version of the packed refs cache from memory to + * disk. The packed-refs file must already be locked for writing (see + * lock_packed_refs()). Return zero on success. + */ +extern int commit_packed_refs(void); + +/* + * Rollback the lockfile for the packed-refs file, and discard the + * in-memory packed reference cache. (The packed-refs file will be + * read anew if it is needed again after this function is called.) + */ +extern void rollback_packed_refs(void); + +/* * Flags for controlling behaviour of pack_refs() * PACK_REFS_PRUNE: Prune loose refs after packing * PACK_REFS_ALL: Pack _all_ refs, not just tags and already packed refs |