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#ifndef REFS_H
#define REFS_H
struct ref_lock {
char *ref_file;
char *lock_file;
unsigned char old_sha1[20];
int lock_fd;
};
/*
* Calls the specified function for each ref file until it returns nonzero,
* and returns the value
*/
extern int head_ref(int (*fn)(const char *path, const unsigned char *sha1));
extern int for_each_ref(int (*fn)(const char *path, const unsigned char *sha1));
extern int for_each_tag_ref(int (*fn)(const char *path, const unsigned char *sha1));
extern int for_each_branch_ref(int (*fn)(const char *path, const unsigned char *sha1));
extern int for_each_remote_ref(int (*fn)(const char *path, const unsigned char *sha1));
/** Reads the refs file specified into sha1 **/
extern int get_ref_sha1(const char *ref, unsigned char *sha1);
/** Locks a "refs/" ref returning the lock on success and NULL on failure. **/
extern struct ref_lock* lock_ref_sha1(const char *ref, const unsigned char *old_sha1, int mustexist);
/** Locks any ref (for 'HEAD' type refs). */
extern struct ref_lock* lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int mustexist);
/** Release any lock taken but not written. **/
extern void unlock_ref (struct ref_lock *lock);
/** Writes sha1 into the ref specified by the lock. **/
extern int write_ref_sha1(struct ref_lock *lock, const unsigned char *sha1, const char *msg);
/** Returns 0 if target has the right format for a ref. **/
extern int check_ref_format(const char *target);
#endif /* REFS_H */
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