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update-ref: -d flag and ref creation safety.

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This adds -d flag to update-ref to allow safe deletion of ref.
Before deleting it, the command checks if the given <oldvalue>
still matches the value the caller thought the ref contained.

Similarly, it also accepts 0{40} or an empty string as <oldvalue>
to allow safe creation of a new ref.

Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano
2006-09-27 01:58:57 -07:00
parent 4431fcc4b1
commit ac5409e420
4 changed files with 50 additions and 5 deletions
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cache.h
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@ -179,6 +179,7 @@ struct lock_file {
extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
extern int commit_lock_file(struct lock_file *);
extern void rollback_lock_file(struct lock_file *);
extern int delete_ref(const char *, unsigned char *sha1);
/* Environment bits from configuration mechanism */
extern int use_legacy_headers;