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