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#ifndef REFS_H
#define REFS_H
/*
* 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));
/** Reads the refs file specified into sha1 **/
extern int get_ref_sha1(const char *ref, unsigned char *sha1);
/** Locks ref and returns the fd to give to write_ref_sha1() if the ref
* has the given value currently; otherwise, returns -1.
**/
extern int lock_ref_sha1(const char *ref, const unsigned char *old_sha1);
/** Writes sha1 into the refs file specified, locked with the given fd. **/
extern int write_ref_sha1(const char *ref, int fd, const unsigned char *sha1);
/** Writes sha1 into the refs file specified. **/
extern int write_ref_sha1_unlocked(const char *ref, const unsigned char *sha1);
/** 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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