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b7e9df2fa90592fff6ff0472e2f50ab67d0dcc8f
   1#ifndef REFS_H
   2#define REFS_H
   3
   4struct ref_lock {
   5        char *ref_file;
   6        char *lock_file;
   7        unsigned char old_sha1[20];
   8        int lock_fd;
   9};
  10
  11/*
  12 * Calls the specified function for each ref file until it returns nonzero,
  13 * and returns the value
  14 */
  15extern int head_ref(int (*fn)(const char *path, const unsigned char *sha1));
  16extern int for_each_ref(int (*fn)(const char *path, const unsigned char *sha1));
  17extern int for_each_tag_ref(int (*fn)(const char *path, const unsigned char *sha1));
  18extern int for_each_branch_ref(int (*fn)(const char *path, const unsigned char *sha1));
  19extern int for_each_remote_ref(int (*fn)(const char *path, const unsigned char *sha1));
  20
  21/** Reads the refs file specified into sha1 **/
  22extern int get_ref_sha1(const char *ref, unsigned char *sha1);
  23
  24/** Locks a "refs/" ref returning the lock on success and NULL on failure. **/
  25extern struct ref_lock* lock_ref_sha1(const char *ref, const unsigned char *old_sha1, int mustexist);
  26
  27/** Locks any ref (for 'HEAD' type refs). */
  28extern struct ref_lock* lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int mustexist);
  29
  30/** Release any lock taken but not written. **/
  31extern void unlock_ref (struct ref_lock *lock);
  32
  33/** Writes sha1 into the ref specified by the lock. **/
  34extern int write_ref_sha1(struct ref_lock *lock, const unsigned char *sha1, const char *msg);
  35
  36/** Returns 0 if target has the right format for a ref. **/
  37extern int check_ref_format(const char *target);
  38
  39#endif /* REFS_H */