refs.h

   1 #ifndef REFS_H
   2 #define REFS_H
   3
   4 struct 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  */
  17 #define REF_ISSYMREF 01
  18 #define REF_ISPACKED 02
  19 #define REF_ISPEELED 04 /* internal use */
  20
  21 typedef int each_ref_fn(const char *refname, const unsigned char *sha1, int flags, void *cb_data);
  22 extern int head_ref(each_ref_fn, void *);
  23 extern int for_each_ref(each_ref_fn, void *);
  24 extern int for_each_tag_ref(each_ref_fn, void *);
  25 extern int for_each_branch_ref(each_ref_fn, void *);
  26 extern int for_each_remote_ref(each_ref_fn, void *);
  27
  28 extern int peel_ref(const char *, unsigned char *);
  29
  30 /** Reads the refs file specified into sha1 **/
  31 extern int get_ref_sha1(const char *ref, unsigned char *sha1);
  32
  33 /** Locks a "refs/" ref returning the lock on success and NULL on failure. **/
  34 extern struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1);
  35
  36 /** Locks any ref (for 'HEAD' type refs). */
  37 extern struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1);
  38
  39 /** Release any lock taken but not written. **/
  40 extern void unlock_ref(struct ref_lock *lock);
  41
  42 /** Writes sha1 into the ref specified by the lock. **/
  43 extern int write_ref_sha1(struct ref_lock *lock, const unsigned char *sha1, const char *msg);
  44
  45 /** Reads log for the value of ref during at_time. **/
  46 extern int read_ref_at(const char *ref, unsigned long at_time, int cnt, unsigned char *sha1);
  47
  48 /** Returns 0 if target has the right format for a ref. **/
  49 extern int check_ref_format(const char *target);
  50
  51 #endif /* REFS_H */