refs.c: remove lock_ref_sha1
[git/git.git] / refs.h
CommitLineData
95fc7512
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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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8 unsigned char old_sha1[20];
9 int lock_fd;
732232a1 10 int force_write;
4bd18c43
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11};
12
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13/*
14 * A ref_transaction represents a collection of ref updates
15 * that should succeed or fail together.
16 *
17 * Calling sequence
18 * ----------------
19 * - Allocate and initialize a `struct ref_transaction` by calling
20 * `ref_transaction_begin()`.
21 *
22 * - List intended ref updates by calling functions like
23 * `ref_transaction_update()` and `ref_transaction_create()`.
24 *
25 * - Call `ref_transaction_commit()` to execute the transaction.
26 * If this succeeds, the ref updates will have taken place and
27 * the transaction cannot be rolled back.
28 *
29 * - At any time call `ref_transaction_free()` to discard the
30 * transaction and free associated resources. In particular,
31 * this rolls back the transaction if it has not been
32 * successfully committed.
33 *
34 * Error handling
35 * --------------
36 *
37 * On error, transaction functions append a message about what
38 * went wrong to the 'err' argument. The message mentions what
39 * ref was being updated (if any) when the error occurred so it
40 * can be passed to 'die' or 'error' as-is.
41 *
42 * The message is appended to err without first clearing err.
43 * err will not be '\n' terminated.
44 */
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45struct ref_transaction;
46
89df9c84
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47/*
48 * Bit values set in the flags argument passed to each_ref_fn():
49 */
50
51/* Reference is a symbolic reference. */
98ac34b2 52#define REF_ISSYMREF 0x01
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53
54/* Reference is a packed reference. */
98ac34b2 55#define REF_ISPACKED 0x02
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56
57/*
58 * Reference cannot be resolved to an object name: dangling symbolic
59 * reference (directly or indirectly), corrupt reference file, or
60 * symbolic reference refers to ill-formatted reference name.
61 */
98ac34b2 62#define REF_ISBROKEN 0x04
f4204ab9 63
8a65ff76 64/*
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65 * The signature for the callback function for the for_each_*()
66 * functions below. The memory pointed to by the refname and sha1
67 * arguments is only guaranteed to be valid for the duration of a
68 * single callback invocation.
69 */
70typedef int each_ref_fn(const char *refname,
71 const unsigned char *sha1, int flags, void *cb_data);
72
73/*
74 * The following functions invoke the specified callback function for
75 * each reference indicated. If the function ever returns a nonzero
76 * value, stop the iteration and return that value. Please note that
77 * it is not safe to modify references while an iteration is in
78 * progress, unless the same callback function invocation that
79 * modifies the reference also returns a nonzero value to immediately
80 * stop the iteration.
8a65ff76 81 */
cb5d709f
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82extern int head_ref(each_ref_fn, void *);
83extern int for_each_ref(each_ref_fn, void *);
2a8177b6 84extern int for_each_ref_in(const char *, each_ref_fn, void *);
cb5d709f
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85extern int for_each_tag_ref(each_ref_fn, void *);
86extern int for_each_branch_ref(each_ref_fn, void *);
87extern int for_each_remote_ref(each_ref_fn, void *);
29268700 88extern int for_each_replace_ref(each_ref_fn, void *);
d08bae7e 89extern int for_each_glob_ref(each_ref_fn, const char *pattern, void *);
b09fe971 90extern int for_each_glob_ref_in(each_ref_fn, const char *pattern, const char* prefix, void *);
8a65ff76 91
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92extern int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
93extern int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
94extern int for_each_ref_in_submodule(const char *submodule, const char *prefix,
95 each_ref_fn fn, void *cb_data);
96extern int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
97extern int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
98extern int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
99
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100extern int head_ref_namespaced(each_ref_fn fn, void *cb_data);
101extern int for_each_namespaced_ref(each_ref_fn fn, void *cb_data);
102
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103static inline const char *has_glob_specials(const char *pattern)
104{
105 return strpbrk(pattern, "?*[");
106}
107
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108/* can be used to learn about broken ref and symref */
109extern int for_each_rawref(each_ref_fn, void *);
110
3cf6134a 111extern void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname);
e6bea66d 112extern void warn_dangling_symrefs(FILE *fp, const char *msg_fmt, const struct string_list* refnames);
f8948e2f 113
30249ee6 114/*
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115 * Lock the packed-refs file for writing. Flags is passed to
116 * hold_lock_file_for_update(). Return 0 on success.
447ff1bf 117 * Errno is set to something meaningful on error.
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118 */
119extern int lock_packed_refs(int flags);
120
121/*
122 * Add a reference to the in-memory packed reference cache. This may
123 * only be called while the packed-refs file is locked (see
124 * lock_packed_refs()). To actually write the packed-refs file, call
125 * commit_packed_refs().
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126 */
127extern void add_packed_ref(const char *refname, const unsigned char *sha1);
128
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129/*
130 * Write the current version of the packed refs cache from memory to
131 * disk. The packed-refs file must already be locked for writing (see
132 * lock_packed_refs()). Return zero on success.
d3f66555 133 * Sets errno to something meaningful on error.
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134 */
135extern int commit_packed_refs(void);
136
137/*
138 * Rollback the lockfile for the packed-refs file, and discard the
139 * in-memory packed reference cache. (The packed-refs file will be
140 * read anew if it is needed again after this function is called.)
141 */
142extern void rollback_packed_refs(void);
143
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144/*
145 * Flags for controlling behaviour of pack_refs()
146 * PACK_REFS_PRUNE: Prune loose refs after packing
147 * PACK_REFS_ALL: Pack _all_ refs, not just tags and already packed refs
148 */
149#define PACK_REFS_PRUNE 0x0001
150#define PACK_REFS_ALL 0x0002
151
152/*
153 * Write a packed-refs file for the current repository.
154 * flags: Combination of the above PACK_REFS_* flags.
155 */
156int pack_refs(unsigned int flags);
157
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158extern int repack_without_refs(const char **refnames, int n,
159 struct strbuf *err);
c9e768bb 160
2c5c66be 161extern int ref_exists(const char *);
e142a3c6 162
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163/*
164 * If refname is a non-symbolic reference that refers to a tag object,
165 * and the tag can be (recursively) dereferenced to a non-tag object,
166 * store the SHA1 of the referred-to object to sha1 and return 0. If
167 * any of these conditions are not met, return a non-zero value.
168 * Symbolic references are considered unpeelable, even if they
169 * ultimately resolve to a peelable tag.
170 */
dfefa935 171extern int peel_ref(const char *refname, unsigned char *sha1);
cf0adba7 172
4bd18c43 173/** Locks any ref (for 'HEAD' type refs). */
68db31cc 174#define REF_NODEREF 0x01
835e3c99 175/* errno is set to something meaningful on failure */
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176extern struct ref_lock *lock_any_ref_for_update(const char *refname,
177 const unsigned char *old_sha1,
9bbb0fa1 178 int flags, int *type_p);
95fc7512 179
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180/** Close the file descriptor owned by a lock and return the status */
181extern int close_ref(struct ref_lock *lock);
182
183/** Close and commit the ref locked by the lock */
184extern int commit_ref(struct ref_lock *lock);
185
4bd18c43 186/** Release any lock taken but not written. **/
e5f38ec3 187extern void unlock_ref(struct ref_lock *lock);
95fc7512 188
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189/** Writes sha1 into the ref specified by the lock. **/
190extern int write_ref_sha1(struct ref_lock *lock, const unsigned char *sha1, const char *msg);
95fc7512 191
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192/*
193 * Setup reflog before using. Set errno to something meaningful on failure.
194 */
5524e241 195int log_ref_setup(const char *refname, char *logfile, int bufsize);
859c3017 196
d556fae2 197/** Reads log for the value of ref during at_time. **/
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MH
198extern int read_ref_at(const char *refname, unsigned long at_time, int cnt,
199 unsigned char *sha1, char **msg,
200 unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt);
d556fae2 201
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202/** Check if a particular reflog exists */
203extern int reflog_exists(const char *refname);
204
205/** Delete a reflog */
206extern int delete_reflog(const char *refname);
207
2ff81662 208/* iterate over reflog entries */
883d60fa 209typedef int each_reflog_ent_fn(unsigned char *osha1, unsigned char *nsha1, const char *, unsigned long, int, const char *, void *);
dfefa935 210int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data);
98f85ff4 211int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn, void *cb_data);
2ff81662 212
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213/*
214 * Calls the specified function for each reflog file until it returns nonzero,
215 * and returns the value
216 */
217extern int for_each_reflog(each_ref_fn, void *);
218
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219#define REFNAME_ALLOW_ONELEVEL 1
220#define REFNAME_REFSPEC_PATTERN 2
dce4bab6 221#define REFNAME_DOT_COMPONENT 4
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222
223/*
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224 * Return 0 iff refname has the correct format for a refname according
225 * to the rules described in Documentation/git-check-ref-format.txt.
226 * If REFNAME_ALLOW_ONELEVEL is set in flags, then accept one-level
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227 * reference names. If REFNAME_REFSPEC_PATTERN is set in flags, then
228 * allow a "*" wildcard character in place of one of the name
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229 * components. No leading or repeated slashes are accepted. If
230 * REFNAME_DOT_COMPONENT is set in flags, then allow refname
231 * components to start with "." (but not a whole component equal to
232 * "." or "..").
8d9c5010 233 */
dfefa935 234extern int check_refname_format(const char *refname, int flags);
95fc7512 235
4577e483 236extern const char *prettify_refname(const char *refname);
dfefa935 237extern char *shorten_unambiguous_ref(const char *refname, int strict);
a9c37a72 238
c976d415 239/** rename ref, return 0 on success **/
678d0f4c 240extern int rename_ref(const char *oldref, const char *newref, const char *logmsg);
c976d415 241
7f820bd9
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242/**
243 * Resolve refname in the nested "gitlink" repository that is located
244 * at path. If the resolution is successful, return 0 and set sha1 to
245 * the name of the object; otherwise, return a non-zero value.
246 */
247extern int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1);
0ebde32c 248
f4124112
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249enum action_on_err {
250 UPDATE_REFS_MSG_ON_ERR,
251 UPDATE_REFS_DIE_ON_ERR,
252 UPDATE_REFS_QUIET_ON_ERR
253};
254
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255/*
256 * Begin a reference transaction. The reference transaction must
33f9fc59 257 * be freed by calling ref_transaction_free().
caa4046c 258 */
93a644ea 259struct ref_transaction *ref_transaction_begin(struct strbuf *err);
caa4046c 260
caa4046c
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261/*
262 * The following functions add a reference check or update to a
263 * ref_transaction. In all of them, refname is the name of the
264 * reference to be affected. The functions make internal copies of
265 * refname, so the caller retains ownership of the parameter. flags
266 * can be REF_NODEREF; it is passed to update_ref_lock().
267 */
268
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269/*
270 * Add a reference update to transaction. new_sha1 is the value that
271 * the reference should have after the update, or zeros if it should
272 * be deleted. If have_old is true, then old_sha1 holds the value
273 * that the reference should have had before the update, or zeros if
274 * it must not have existed beforehand.
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275 * Function returns 0 on success and non-zero on failure. A failure to update
276 * means that the transaction as a whole has failed and will need to be
b416af5b 277 * rolled back.
caa4046c 278 */
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279int ref_transaction_update(struct ref_transaction *transaction,
280 const char *refname,
281 const unsigned char *new_sha1,
282 const unsigned char *old_sha1,
283 int flags, int have_old,
284 struct strbuf *err);
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285
286/*
287 * Add a reference creation to transaction. new_sha1 is the value
288 * that the reference should have after the update; it must not be the
289 * null SHA-1. It is verified that the reference does not exist
290 * already.
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291 * Function returns 0 on success and non-zero on failure. A failure to create
292 * means that the transaction as a whole has failed and will need to be
293 * rolled back.
caa4046c 294 */
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295int ref_transaction_create(struct ref_transaction *transaction,
296 const char *refname,
297 const unsigned char *new_sha1,
298 int flags,
299 struct strbuf *err);
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300
301/*
302 * Add a reference deletion to transaction. If have_old is true, then
303 * old_sha1 holds the value that the reference should have had before
304 * the update (which must not be the null SHA-1).
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305 * Function returns 0 on success and non-zero on failure. A failure to delete
306 * means that the transaction as a whole has failed and will need to be
307 * rolled back.
caa4046c 308 */
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309int ref_transaction_delete(struct ref_transaction *transaction,
310 const char *refname,
311 const unsigned char *old_sha1,
312 int flags, int have_old,
313 struct strbuf *err);
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314
315/*
316 * Commit all of the changes that have been queued in transaction, as
317 * atomically as possible. Return a nonzero value if there is a
33f9fc59 318 * problem.
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319 */
320int ref_transaction_commit(struct ref_transaction *transaction,
01319837 321 const char *msg, struct strbuf *err);
caa4046c 322
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323/*
324 * Free an existing transaction and all associated data.
325 */
326void ref_transaction_free(struct ref_transaction *transaction);
327
f4124112 328/** Lock a ref and then write its file */
3d9f037c
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329int update_ref(const char *action, const char *refname,
330 const unsigned char *sha1, const unsigned char *oldval,
331 int flags, enum action_on_err onerr);
332
daebaa78
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333extern int parse_hide_refs_config(const char *var, const char *value, const char *);
334extern int ref_is_hidden(const char *);
335
95fc7512 336#endif /* REFS_H */