1#ifndef REFS_H 2#define REFS_H 3 4struct ref_lock { 5 char *ref_name; 6 char *log_file; 7 struct lock_file *lk; 8 unsigned char old_sha1[20]; 9 int lock_fd; 10 int force_write; 11}; 12 13/* 14 * Calls the specified function for each ref file until it returns nonzero, 15 * and returns the value 16 */ 17typedef int each_ref_fn(const char *refname, const unsigned char *sha1, void *cb_data); 18extern int head_ref(each_ref_fn, void *); 19extern int for_each_ref(each_ref_fn, void *); 20extern int for_each_tag_ref(each_ref_fn, void *); 21extern int for_each_branch_ref(each_ref_fn, void *); 22extern int for_each_remote_ref(each_ref_fn, void *); 23 24/** Reads the refs file specified into sha1 **/ 25extern int get_ref_sha1(const char *ref, unsigned char *sha1); 26 27/** Locks a "refs/" ref returning the lock on success and NULL on failure. **/ 28extern struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1, int mustexist); 29 30/** Locks any ref (for 'HEAD' type refs). */ 31extern struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int mustexist); 32 33/** Release any lock taken but not written. **/ 34extern void unlock_ref(struct ref_lock *lock); 35 36/** Writes sha1 into the ref specified by the lock. **/ 37extern int write_ref_sha1(struct ref_lock *lock, const unsigned char *sha1, const char *msg); 38 39/** Reads log for the value of ref during at_time. **/ 40extern int read_ref_at(const char *ref, unsigned long at_time, unsigned char *sha1); 41 42/** Returns 0 if target has the right format for a ref. **/ 43extern int check_ref_format(const char *target); 44 45#endif /* REFS_H */