git/refs.h
Shawn Pearce d556fae2c0 Support 'master@2 hours ago' syntax
Extended sha1 expressions may now include date specifications
which indicate a point in time within the local repository's
history.  If the ref indicated to the left of '@' has a log in
$GIT_DIR/logs/<ref> then the value of the ref at the time indicated
by the specification is obtained from the ref's log.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-05-17 17:36:36 -07:00

44 lines
1.6 KiB
C

#ifndef REFS_H
#define REFS_H
struct ref_lock {
char *ref_file;
char *lock_file;
char *log_file;
unsigned char old_sha1[20];
int lock_fd;
};
/*
* Calls the specified function for each ref file until it returns nonzero,
* and returns the value
*/
extern int head_ref(int (*fn)(const char *path, const unsigned char *sha1));
extern int for_each_ref(int (*fn)(const char *path, const unsigned char *sha1));
extern int for_each_tag_ref(int (*fn)(const char *path, const unsigned char *sha1));
extern int for_each_branch_ref(int (*fn)(const char *path, const unsigned char *sha1));
extern int for_each_remote_ref(int (*fn)(const char *path, const unsigned char *sha1));
/** Reads the refs file specified into sha1 **/
extern int get_ref_sha1(const char *ref, unsigned char *sha1);
/** Locks a "refs/" ref returning the lock on success and NULL on failure. **/
extern struct ref_lock* lock_ref_sha1(const char *ref, const unsigned char *old_sha1, int mustexist);
/** Locks any ref (for 'HEAD' type refs). */
extern struct ref_lock* lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int mustexist);
/** Release any lock taken but not written. **/
extern void unlock_ref (struct ref_lock *lock);
/** Writes sha1 into the ref specified by the lock. **/
extern int write_ref_sha1(struct ref_lock *lock, const unsigned char *sha1, const char *msg);
/** Reads log for the value of ref during at_time. **/
extern int read_ref_at(const char *ref, unsigned long at_time, unsigned char *sha1);
/** Returns 0 if target has the right format for a ref. **/
extern int check_ref_format(const char *target);
#endif /* REFS_H */