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Improve abstraction of ref lock/write.

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Created 'struct ref_lock' to contain the data necessary to perform
a ref update.  This change improves writing a ref as the file names
are generated only once (rather than twice) and supports following
symrefs (up to the maximum depth).  Further the ref_lock structure
provides room to extend the update API with ref logging.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Shawn Pearce
2006-05-17 05:55:02 -04:00
committed by Junio C Hamano
parent 70e1a880a3
commit 4bd18c43d9
3 changed files with 146 additions and 150 deletions
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24
refs.h
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@ -1,6 +1,13 @@
#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
@ -14,16 +21,17 @@ extern int for_each_remote_ref(int (*fn)(const char *path, const unsigned char *
/** 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);
/** 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);
/** 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);
/** 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);
/** Writes sha1 into the refs file specified. **/
extern int write_ref_sha1_unlocked(const char *ref, const unsigned char *sha1);
/** 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);