git-reset: refuse to do hard reset in a bare repository
[git/git.git] / refs.h
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1#ifndef REFS_H
2#define REFS_H
3
4bd18c43 4struct ref_lock {
434cd0cd 5 char *ref_name;
1655707c 6 char *orig_ref_name;
c33d5174 7 struct lock_file *lk;
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SP
8 unsigned char old_sha1[20];
9 int lock_fd;
732232a1 10 int force_write;
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11};
12
f4204ab9
JH
13#define REF_ISSYMREF 01
14#define REF_ISPACKED 02
15
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16/*
17 * Calls the specified function for each ref file until it returns nonzero,
18 * and returns the value
19 */
8da19775 20typedef int each_ref_fn(const char *refname, const unsigned char *sha1, int flags, void *cb_data);
cb5d709f
JH
21extern int head_ref(each_ref_fn, void *);
22extern int for_each_ref(each_ref_fn, void *);
23extern int for_each_tag_ref(each_ref_fn, void *);
24extern int for_each_branch_ref(each_ref_fn, void *);
25extern int for_each_remote_ref(each_ref_fn, void *);
8a65ff76 26
cf0adba7
JH
27extern int peel_ref(const char *, unsigned char *);
28
4bd18c43 29/** Locks a "refs/" ref returning the lock on success and NULL on failure. **/
4431fcc4 30extern struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1);
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31
32/** Locks any ref (for 'HEAD' type refs). */
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33#define REF_NODEREF 0x01
34extern struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags);
95fc7512 35
4bd18c43 36/** Release any lock taken but not written. **/
e5f38ec3 37extern void unlock_ref(struct ref_lock *lock);
95fc7512 38
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SP
39/** Writes sha1 into the ref specified by the lock. **/
40extern int write_ref_sha1(struct ref_lock *lock, const unsigned char *sha1, const char *msg);
95fc7512 41
d556fae2 42/** Reads log for the value of ref during at_time. **/
16d7cc90 43extern int read_ref_at(const char *ref, unsigned long at_time, int cnt, unsigned char *sha1, char **msg, unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt);
d556fae2 44
2ff81662 45/* iterate over reflog entries */
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46typedef int each_reflog_ent_fn(unsigned char *osha1, unsigned char *nsha1, const char *, unsigned long, int, const char *, void *);
47int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data);
2ff81662 48
eb8381c8
NP
49/*
50 * Calls the specified function for each reflog file until it returns nonzero,
51 * and returns the value
52 */
53extern int for_each_reflog(each_ref_fn, void *);
54
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55/** Returns 0 if target has the right format for a ref. **/
56extern int check_ref_format(const char *target);
57
c976d415 58/** rename ref, return 0 on success **/
678d0f4c 59extern int rename_ref(const char *oldref, const char *newref, const char *logmsg);
c976d415 60
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61/** resolve ref in nested "gitlink" repository */
62extern int resolve_gitlink_ref(const char *name, const char *refname, unsigned char *result);
63
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CR
64/** lock a ref and then write its file */
65enum action_on_err { MSG_ON_ERR, DIE_ON_ERR, QUIET_ON_ERR };
66int update_ref(const char *action, const char *refname,
67 const unsigned char *sha1, const unsigned char *oldval,
68 int flags, enum action_on_err onerr);
69
95fc7512 70#endif /* REFS_H */