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43831e9be70b8dacbd6afff14435f6a0509dc173
   1#ifndef REFS_H
   2#define REFS_H
   3
   4struct ref_lock {
   5        char *ref_file;
   6        char *lock_file;
   7        char *log_file;
   8        unsigned char old_sha1[20];
   9        int lock_fd;
  10};
  11
  12/*
  13 * Calls the specified function for each ref file until it returns nonzero,
  14 * and returns the value
  15 */
  16extern int head_ref(int (*fn)(const char *path, const unsigned char *sha1));
  17extern int for_each_ref(int (*fn)(const char *path, const unsigned char *sha1));
  18extern int for_each_tag_ref(int (*fn)(const char *path, const unsigned char *sha1));
  19extern int for_each_branch_ref(int (*fn)(const char *path, const unsigned char *sha1));
  20extern int for_each_remote_ref(int (*fn)(const char *path, const unsigned char *sha1));
  21
  22/** Reads the refs file specified into sha1 **/
  23extern int get_ref_sha1(const char *ref, unsigned char *sha1);
  24
  25/** Locks a "refs/" ref returning the lock on success and NULL on failure. **/
  26extern struct ref_lock* lock_ref_sha1(const char *ref, const unsigned char *old_sha1, int mustexist);
  27
  28/** Locks any ref (for 'HEAD' type refs). */
  29extern struct ref_lock* lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int mustexist);
  30
  31/** Release any lock taken but not written. **/
  32extern void unlock_ref (struct ref_lock *lock);
  33
  34/** Writes sha1 into the ref specified by the lock. **/
  35extern int write_ref_sha1(struct ref_lock *lock, const unsigned char *sha1, const char *msg);
  36
  37/** Returns 0 if target has the right format for a ref. **/
  38extern int check_ref_format(const char *target);
  39
  40#endif /* REFS_H */