worktree: convert struct worktree to object_id
[git/git.git] / refs.h
CommitLineData
95fc7512
DB
1#ifndef REFS_H
2#define REFS_H
3
504c4d42 4struct object_id;
077be78d 5struct ref_store;
504c4d42
NTND
6struct strbuf;
7struct string_list;
17eff96b 8struct worktree;
504c4d42 9
fb58c8d5
MH
10/*
11 * Resolve a reference, recursively following symbolic refererences.
12 *
54fad661
RS
13 * Return the name of the non-symbolic reference that ultimately pointed
14 * at the resolved object name. The return value, if not NULL, is a
15 * pointer into either a static buffer or the input ref.
16 *
17 * If sha1 is non-NULL, store the referred-to object's name in it.
fb58c8d5
MH
18 *
19 * If the reference cannot be resolved to an object, the behavior
20 * depends on the RESOLVE_REF_READING flag:
21 *
22 * - If RESOLVE_REF_READING is set, return NULL.
23 *
24 * - If RESOLVE_REF_READING is not set, clear sha1 and return the name of
25 * the last reference name in the chain, which will either be a non-symbolic
26 * reference or an undefined reference. If this is a prelude to
27 * "writing" to the ref, the return value is the name of the ref
28 * that will actually be created or changed.
29 *
30 * If the RESOLVE_REF_NO_RECURSE flag is passed, only resolves one
31 * level of symbolic reference. The value stored in sha1 for a symbolic
32 * reference will always be null_sha1 in this case, and the return
33 * value is the reference that the symref refers to directly.
34 *
35 * If flags is non-NULL, set the value that it points to the
36 * combination of REF_ISPACKED (if the reference was found among the
37 * packed references), REF_ISSYMREF (if the initial reference was a
38 * symbolic reference), REF_BAD_NAME (if the reference name is ill
39 * formed --- see RESOLVE_REF_ALLOW_BAD_NAME below), and REF_ISBROKEN
40 * (if the ref is malformed or has a bad name). See refs.h for more detail
41 * on each flag.
42 *
43 * If ref is not a properly-formatted, normalized reference, return
44 * NULL. If more than MAXDEPTH recursive symbolic lookups are needed,
45 * give up and return NULL.
46 *
47 * RESOLVE_REF_ALLOW_BAD_NAME allows resolving refs even when their
48 * name is invalid according to git-check-ref-format(1). If the name
49 * is bad then the value stored in sha1 will be null_sha1 and the two
50 * flags REF_ISBROKEN and REF_BAD_NAME will be set.
51 *
52 * Even with RESOLVE_REF_ALLOW_BAD_NAME, names that escape the refs/
53 * directory and do not consist of all caps and underscores cannot be
54 * resolved. The function returns NULL for such ref names.
55 * Caps and underscores refers to the special refs, such as HEAD,
56 * FETCH_HEAD and friends, that all live outside of the refs/ directory.
57 */
58#define RESOLVE_REF_READING 0x01
59#define RESOLVE_REF_NO_RECURSE 0x02
60#define RESOLVE_REF_ALLOW_BAD_NAME 0x04
61
7d2df051
NTND
62const char *refs_resolve_ref_unsafe(struct ref_store *refs,
63 const char *refname,
64 int resolve_flags,
65 unsigned char *sha1,
66 int *flags);
1354c9b2
MH
67const char *resolve_ref_unsafe(const char *refname, int resolve_flags,
68 unsigned char *sha1, int *flags);
fb58c8d5 69
7d2df051
NTND
70char *refs_resolve_refdup(struct ref_store *refs,
71 const char *refname, int resolve_flags,
0f2dc722 72 struct object_id *oid, int *flags);
1354c9b2 73char *resolve_refdup(const char *refname, int resolve_flags,
0f2dc722 74 struct object_id *oid, int *flags);
fb58c8d5 75
7d2df051 76int refs_read_ref_full(struct ref_store *refs, const char *refname,
34c290a6 77 int resolve_flags, struct object_id *oid, int *flags);
1354c9b2 78int read_ref_full(const char *refname, int resolve_flags,
34c290a6 79 struct object_id *oid, int *flags);
80int read_ref(const char *refname, struct object_id *oid);
fb58c8d5 81
7d2df051
NTND
82/*
83 * Return 0 if a reference named refname could be created without
84 * conflicting with the name of an existing reference. Otherwise,
85 * return a negative value and write an explanation to err. If extras
86 * is non-NULL, it is a list of additional refnames with which refname
87 * is not allowed to conflict. If skip is non-NULL, ignore potential
88 * conflicts with refs in skip (e.g., because they are scheduled for
89 * deletion in the same operation). Behavior is undefined if the same
90 * name is listed in both extras and skip.
91 *
92 * Two reference names conflict if one of them exactly matches the
93 * leading components of the other; e.g., "foo/bar" conflicts with
94 * both "foo" and with "foo/bar/baz" but not with "foo/bar" or
95 * "foo/barbados".
96 *
97 * extras and skip must be sorted.
98 */
99
100int refs_verify_refname_available(struct ref_store *refs,
101 const char *refname,
b05855b5 102 const struct string_list *extras,
7d2df051
NTND
103 const struct string_list *skip,
104 struct strbuf *err);
105
1354c9b2 106int ref_exists(const char *refname);
fb58c8d5 107
341fb286
CW
108int should_autocreate_reflog(const char *refname);
109
1354c9b2 110int is_branch(const char *refname);
fb58c8d5 111
6fb5acfd
DT
112extern int refs_init_db(struct strbuf *err);
113
fb58c8d5
MH
114/*
115 * If refname is a non-symbolic reference that refers to a tag object,
116 * and the tag can be (recursively) dereferenced to a non-tag object,
b420d909 117 * store the object ID of the referred-to object to oid and return 0.
118 * If any of these conditions are not met, return a non-zero value.
fb58c8d5
MH
119 * Symbolic references are considered unpeelable, even if they
120 * ultimately resolve to a peelable tag.
121 */
7d2df051 122int refs_peel_ref(struct ref_store *refs, const char *refname,
b420d909 123 struct object_id *oid);
124int peel_ref(const char *refname, struct object_id *oid);
fb58c8d5
MH
125
126/**
a8355bb7
MH
127 * Resolve refname in the nested "gitlink" repository in the specified
128 * submodule (which must be non-NULL). If the resolution is
129 * successful, return 0 and set sha1 to the name of the object;
130 * otherwise, return a non-zero value.
fb58c8d5 131 */
a8355bb7 132int resolve_gitlink_ref(const char *submodule, const char *refname,
a98e6101 133 struct object_id *oid);
fb58c8d5
MH
134
135/*
136 * Return true iff abbrev_name is a possible abbreviation for
137 * full_name according to the rules defined by ref_rev_parse_rules in
138 * refs.c.
139 */
1354c9b2 140int refname_match(const char *abbrev_name, const char *full_name);
fb58c8d5 141
cca5fa64 142int expand_ref(const char *str, int len, struct object_id *oid, char **ref);
143int dwim_ref(const char *str, int len, struct object_id *oid, char **ref);
334dc52f 144int dwim_log(const char *str, int len, struct object_id *oid, char **ref);
fb58c8d5 145
b416af5b 146/*
30173b88
MH
147 * A ref_transaction represents a collection of reference updates that
148 * should succeed or fail together.
b416af5b
RS
149 *
150 * Calling sequence
151 * ----------------
30173b88 152 *
b416af5b
RS
153 * - Allocate and initialize a `struct ref_transaction` by calling
154 * `ref_transaction_begin()`.
155 *
30173b88
MH
156 * - Specify the intended ref updates by calling one or more of the
157 * following functions:
158 * - `ref_transaction_update()`
159 * - `ref_transaction_create()`
160 * - `ref_transaction_delete()`
161 * - `ref_transaction_verify()`
162 *
163 * - Then either:
164 *
165 * - Optionally call `ref_transaction_prepare()` to prepare the
166 * transaction. This locks all references, checks preconditions,
167 * etc. but doesn't finalize anything. If this step fails, the
168 * transaction has been closed and can only be freed. If this step
169 * succeeds, then `ref_transaction_commit()` is almost certain to
170 * succeed. However, you can still call `ref_transaction_abort()`
171 * if you decide not to commit the transaction after all.
172 *
173 * - Call `ref_transaction_commit()` to execute the transaction,
174 * make the changes permanent, and release all locks. If you
175 * haven't already called `ref_transaction_prepare()`, then
176 * `ref_transaction_commit()` calls it for you.
177 *
178 * Or
179 *
180 * - Call `initial_ref_transaction_commit()` if the ref database is
181 * known to be empty and have no other writers (e.g. during
182 * clone). This is likely to be much faster than
183 * `ref_transaction_commit()`. `ref_transaction_prepare()` should
184 * *not* be called before `initial_ref_transaction_commit()`.
185 *
186 * - Then finally, call `ref_transaction_free()` to free the
187 * `ref_transaction` data structure.
188 *
189 * At any time before calling `ref_transaction_commit()`, you can call
190 * `ref_transaction_abort()` to abort the transaction, rollback any
191 * locks, and free any associated resources (including the
192 * `ref_transaction` data structure).
193 *
194 * Putting it all together, a complete reference update looks like
195 *
196 * struct ref_transaction *transaction;
197 * struct strbuf err = STRBUF_INIT;
198 * int ret = 0;
199 *
200 * transaction = ref_store_transaction_begin(refs, &err);
201 * if (!transaction ||
202 * ref_transaction_update(...) ||
203 * ref_transaction_create(...) ||
204 * ...etc... ||
205 * ref_transaction_commit(transaction, &err)) {
206 * error("%s", err.buf);
207 * ret = -1;
208 * }
209 * ref_transaction_free(transaction);
210 * strbuf_release(&err);
211 * return ret;
b416af5b
RS
212 *
213 * Error handling
214 * --------------
215 *
216 * On error, transaction functions append a message about what
217 * went wrong to the 'err' argument. The message mentions what
218 * ref was being updated (if any) when the error occurred so it
219 * can be passed to 'die' or 'error' as-is.
220 *
221 * The message is appended to err without first clearing err.
222 * err will not be '\n' terminated.
49386868
DT
223 *
224 * Caveats
225 * -------
226 *
227 * Note that no locks are taken, and no refs are read, until
30173b88
MH
228 * `ref_transaction_prepare()` or `ref_transaction_commit()` is
229 * called. So, for example, `ref_transaction_verify()` won't report a
230 * verification failure until the commit is attempted.
b416af5b 231 */
caa4046c
MH
232struct ref_transaction;
233
89df9c84 234/*
3bc581b9
MH
235 * Bit values set in the flags argument passed to each_ref_fn() and
236 * stored in ref_iterator::flags. Other bits are for internal use
237 * only:
89df9c84
MH
238 */
239
240/* Reference is a symbolic reference. */
98ac34b2 241#define REF_ISSYMREF 0x01
89df9c84
MH
242
243/* Reference is a packed reference. */
98ac34b2 244#define REF_ISPACKED 0x02
89df9c84
MH
245
246/*
247 * Reference cannot be resolved to an object name: dangling symbolic
d0f810f0
RS
248 * reference (directly or indirectly), corrupt reference file,
249 * reference exists but name is bad, or symbolic reference refers to
250 * ill-formatted reference name.
89df9c84 251 */
98ac34b2 252#define REF_ISBROKEN 0x04
f4204ab9 253
d0f810f0
RS
254/*
255 * Reference name is not well formed.
256 *
257 * See git-check-ref-format(1) for the definition of well formed ref names.
258 */
259#define REF_BAD_NAME 0x08
260
8a65ff76 261/*
4f78c24c
MH
262 * The signature for the callback function for the for_each_*()
263 * functions below. The memory pointed to by the refname and sha1
264 * arguments is only guaranteed to be valid for the duration of a
265 * single callback invocation.
266 */
267typedef int each_ref_fn(const char *refname,
2b2a5be3
MH
268 const struct object_id *oid, int flags, void *cb_data);
269
4f78c24c
MH
270/*
271 * The following functions invoke the specified callback function for
272 * each reference indicated. If the function ever returns a nonzero
273 * value, stop the iteration and return that value. Please note that
274 * it is not safe to modify references while an iteration is in
275 * progress, unless the same callback function invocation that
276 * modifies the reference also returns a nonzero value to immediately
adac8115 277 * stop the iteration. Returned references are sorted.
8a65ff76 278 */
62f0b399
NTND
279int refs_head_ref(struct ref_store *refs,
280 each_ref_fn fn, void *cb_data);
7d2df051
NTND
281int refs_for_each_ref(struct ref_store *refs,
282 each_ref_fn fn, void *cb_data);
283int refs_for_each_ref_in(struct ref_store *refs, const char *prefix,
284 each_ref_fn fn, void *cb_data);
285int refs_for_each_tag_ref(struct ref_store *refs,
286 each_ref_fn fn, void *cb_data);
287int refs_for_each_branch_ref(struct ref_store *refs,
288 each_ref_fn fn, void *cb_data);
289int refs_for_each_remote_ref(struct ref_store *refs,
290 each_ref_fn fn, void *cb_data);
291
1354c9b2
MH
292int head_ref(each_ref_fn fn, void *cb_data);
293int for_each_ref(each_ref_fn fn, void *cb_data);
294int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data);
073cf63c
NTND
295int refs_for_each_fullref_in(struct ref_store *refs, const char *prefix,
296 each_ref_fn fn, void *cb_data,
297 unsigned int broken);
1354c9b2
MH
298int for_each_fullref_in(const char *prefix, each_ref_fn fn, void *cb_data,
299 unsigned int broken);
300int for_each_tag_ref(each_ref_fn fn, void *cb_data);
301int for_each_branch_ref(each_ref_fn fn, void *cb_data);
302int for_each_remote_ref(each_ref_fn fn, void *cb_data);
303int for_each_replace_ref(each_ref_fn fn, void *cb_data);
304int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data);
305int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
306 const char *prefix, void *cb_data);
307
1354c9b2
MH
308int head_ref_namespaced(each_ref_fn fn, void *cb_data);
309int for_each_namespaced_ref(each_ref_fn fn, void *cb_data);
a1bea2c1 310
fb58c8d5 311/* can be used to learn about broken ref and symref */
7d2df051 312int refs_for_each_rawref(struct ref_store *refs, each_ref_fn fn, void *cb_data);
1354c9b2 313int for_each_rawref(each_ref_fn fn, void *cb_data);
fb58c8d5 314
894a9d33
TR
315static inline const char *has_glob_specials(const char *pattern)
316{
317 return strpbrk(pattern, "?*[");
318}
319
1354c9b2
MH
320void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname);
321void warn_dangling_symrefs(FILE *fp, const char *msg_fmt,
322 const struct string_list *refnames);
f8948e2f 323
32d462ce
MH
324/*
325 * Flags for controlling behaviour of pack_refs()
326 * PACK_REFS_PRUNE: Prune loose refs after packing
327 * PACK_REFS_ALL: Pack _all_ refs, not just tags and already packed refs
328 */
329#define PACK_REFS_PRUNE 0x0001
330#define PACK_REFS_ALL 0x0002
331
332/*
333 * Write a packed-refs file for the current repository.
334 * flags: Combination of the above PACK_REFS_* flags.
335 */
7d2df051 336int refs_pack_refs(struct ref_store *refs, unsigned int flags);
32d462ce 337
835e3c99 338/*
31e07f76 339 * Flags controlling ref_transaction_update(), ref_transaction_create(), etc.
029cdb4a
RS
340 * REF_NODEREF: act on the ref directly, instead of dereferencing
341 * symbolic references.
342 *
581d4e0c 343 * Other flags are reserved for internal use.
835e3c99 344 */
68db31cc 345#define REF_NODEREF 0x01
0f2a71d9 346#define REF_FORCE_CREATE_REFLOG 0x40
95fc7512 347
c788c54c
TG
348/*
349 * Flags that can be passed in to ref_transaction_update
350 */
351#define REF_TRANSACTION_UPDATE_ALLOWED_FLAGS \
352 REF_ISPRUNING | \
353 REF_FORCE_CREATE_REFLOG | \
354 REF_NODEREF
355
bd3b02da 356/*
a4c653df 357 * Setup reflog before using. Fill in err and return -1 on failure.
bd3b02da 358 */
7d2df051
NTND
359int refs_create_reflog(struct ref_store *refs, const char *refname,
360 int force_create, struct strbuf *err);
abd0cd3a 361int safe_create_reflog(const char *refname, int force_create, struct strbuf *err);
859c3017 362
d556fae2 363/** Reads log for the value of ref during at_time. **/
1354c9b2 364int read_ref_at(const char *refname, unsigned int flags,
dddbad72 365 timestamp_t at_time, int cnt,
8eb36d94 366 struct object_id *oid, char **msg,
dddbad72 367 timestamp_t *cutoff_time, int *cutoff_tz, int *cutoff_cnt);
d556fae2 368
4da58835 369/** Check if a particular reflog exists */
7d2df051 370int refs_reflog_exists(struct ref_store *refs, const char *refname);
1354c9b2 371int reflog_exists(const char *refname);
4da58835 372
fc1c2168 373/*
2616a5e5 374 * Delete the specified reference. If old_oid is non-NULL, then
1c03c4d3 375 * verify that the current value of the reference is old_sha1 before
2616a5e5 376 * deleting it. If old_oid is NULL, delete the reference if it
377 * exists, regardless of its old value. It is an error for old_oid to
378 * be null_oid. msg and flags are passed through to
64da4199 379 * ref_transaction_delete().
fc1c2168 380 */
c0fe4e8b
NTND
381int refs_delete_ref(struct ref_store *refs, const char *msg,
382 const char *refname,
2616a5e5 383 const struct object_id *old_oid,
c0fe4e8b 384 unsigned int flags);
755b49ae 385int delete_ref(const char *msg, const char *refname,
2616a5e5 386 const struct object_id *old_oid, unsigned int flags);
fc1c2168 387
98ffd5ff
MH
388/*
389 * Delete the specified references. If there are any problems, emit
390 * errors but attempt to keep going (i.e., the deletes are not done in
64da4199 391 * an all-or-nothing transaction). msg and flags are passed through to
c5f04ddd 392 * ref_transaction_delete().
98ffd5ff 393 */
64da4199
MH
394int refs_delete_refs(struct ref_store *refs, const char *msg,
395 struct string_list *refnames, unsigned int flags);
396int delete_refs(const char *msg, struct string_list *refnames,
397 unsigned int flags);
98ffd5ff 398
4da58835 399/** Delete a reflog */
7d2df051 400int refs_delete_reflog(struct ref_store *refs, const char *refname);
1354c9b2 401int delete_reflog(const char *refname);
4da58835 402
2ff81662 403/* iterate over reflog entries */
1354c9b2 404typedef int each_reflog_ent_fn(
9461d272 405 struct object_id *old_oid, struct object_id *new_oid,
dddbad72 406 const char *committer, timestamp_t timestamp,
1354c9b2
MH
407 int tz, const char *msg, void *cb_data);
408
7d2df051
NTND
409int refs_for_each_reflog_ent(struct ref_store *refs, const char *refname,
410 each_reflog_ent_fn fn, void *cb_data);
411int refs_for_each_reflog_ent_reverse(struct ref_store *refs,
412 const char *refname,
413 each_reflog_ent_fn fn,
414 void *cb_data);
dfefa935 415int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data);
98f85ff4 416int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn, void *cb_data);
2ff81662 417
eb8381c8
NP
418/*
419 * Calls the specified function for each reflog file until it returns nonzero,
adac8115 420 * and returns the value. Reflog file order is unspecified.
eb8381c8 421 */
7d2df051 422int refs_for_each_reflog(struct ref_store *refs, each_ref_fn fn, void *cb_data);
1354c9b2 423int for_each_reflog(each_ref_fn fn, void *cb_data);
eb8381c8 424
8d9c5010
MH
425#define REFNAME_ALLOW_ONELEVEL 1
426#define REFNAME_REFSPEC_PATTERN 2
427
428/*
dfefa935
MH
429 * Return 0 iff refname has the correct format for a refname according
430 * to the rules described in Documentation/git-check-ref-format.txt.
431 * If REFNAME_ALLOW_ONELEVEL is set in flags, then accept one-level
8d9c5010 432 * reference names. If REFNAME_REFSPEC_PATTERN is set in flags, then
cd377f45
JK
433 * allow a single "*" wildcard character in the refspec. No leading or
434 * repeated slashes are accepted.
8d9c5010 435 */
1354c9b2 436int check_refname_format(const char *refname, int flags);
95fc7512 437
1354c9b2 438const char *prettify_refname(const char *refname);
fb58c8d5 439
1354c9b2 440char *shorten_unambiguous_ref(const char *refname, int strict);
a9c37a72 441
c976d415 442/** rename ref, return 0 on success **/
7d2df051
NTND
443int refs_rename_ref(struct ref_store *refs, const char *oldref,
444 const char *newref, const char *logmsg);
52d59cc6
SD
445int rename_ref(const char *oldref, const char *newref,
446 const char *logmsg);
447
448/** copy ref, return 0 on success **/
449int refs_copy_existing_ref(struct ref_store *refs, const char *oldref,
450 const char *newref, const char *logmsg);
451int copy_existing_ref(const char *oldref, const char *newref,
452 const char *logmsg);
c976d415 453
7d2df051
NTND
454int refs_create_symref(struct ref_store *refs, const char *refname,
455 const char *target, const char *logmsg);
1354c9b2 456int create_symref(const char *refname, const char *target, const char *logmsg);
0ebde32c 457
f4124112
MH
458enum action_on_err {
459 UPDATE_REFS_MSG_ON_ERR,
460 UPDATE_REFS_DIE_ON_ERR,
461 UPDATE_REFS_QUIET_ON_ERR
462};
463
caa4046c
MH
464/*
465 * Begin a reference transaction. The reference transaction must
33f9fc59 466 * be freed by calling ref_transaction_free().
caa4046c 467 */
c0fe4e8b
NTND
468struct ref_transaction *ref_store_transaction_begin(struct ref_store *refs,
469 struct strbuf *err);
93a644ea 470struct ref_transaction *ref_transaction_begin(struct strbuf *err);
caa4046c 471
caa4046c 472/*
d1dd721f
MH
473 * Reference transaction updates
474 *
475 * The following four functions add a reference check or update to a
476 * ref_transaction. They have some common similar parameters:
477 *
478 * transaction -- a pointer to an open ref_transaction, obtained
479 * from ref_transaction_begin().
480 *
481 * refname -- the name of the reference to be affected.
482 *
fd2ce9c0
MH
483 * new_sha1 -- the SHA-1 that should be set to be the new value of
484 * the reference. Some functions allow this parameter to be
485 * NULL, meaning that the reference is not changed, or
486 * null_sha1, meaning that the reference should be deleted. A
487 * copy of this value is made in the transaction.
488 *
489 * old_sha1 -- the SHA-1 value that the reference must have before
490 * the update. Some functions allow this parameter to be NULL,
491 * meaning that the old value of the reference is not checked,
492 * or null_sha1, meaning that the reference must not exist
493 * before the update. A copy of this value is made in the
494 * transaction.
495 *
d1dd721f
MH
496 * flags -- flags affecting the update, passed to
497 * update_ref_lock(). Can be REF_NODEREF, which means that
498 * symbolic references should not be followed.
499 *
500 * msg -- a message describing the change (for the reflog).
501 *
502 * err -- a strbuf for receiving a description of any error that
dc72b500 503 * might have occurred.
d1dd721f
MH
504 *
505 * The functions make internal copies of refname and msg, so the
506 * caller retains ownership of these parameters.
507 *
508 * The functions return 0 on success and non-zero on failure. A
509 * failure means that the transaction as a whole has failed and needs
510 * to be rolled back.
caa4046c
MH
511 */
512
caa4046c 513/*
89f3bbdd 514 * Add a reference update to transaction. new_oid is the value that
515 * the reference should have after the update, or null_oid if it
516 * should be deleted. If new_oid is NULL, then the reference is not
517 * changed at all. old_oid is the value that the reference must have
518 * before the update, or null_oid if it must not have existed
16180334 519 * beforehand. The old value is checked after the lock is taken to
89f3bbdd 520 * prevent races. If the old value doesn't agree with old_oid, the
521 * whole transaction fails. If old_oid is NULL, then the previous
16180334
MH
522 * value is not checked.
523 *
d1dd721f
MH
524 * See the above comment "Reference transaction updates" for more
525 * information.
caa4046c 526 */
8e34800e
RS
527int ref_transaction_update(struct ref_transaction *transaction,
528 const char *refname,
89f3bbdd 529 const struct object_id *new_oid,
530 const struct object_id *old_oid,
1d147bdf 531 unsigned int flags, const char *msg,
8e34800e 532 struct strbuf *err);
caa4046c
MH
533
534/*
89f3bbdd 535 * Add a reference creation to transaction. new_oid is the value that
d1dd721f 536 * the reference should have after the update; it must not be
89f3bbdd 537 * null_oid. It is verified that the reference does not exist
caa4046c 538 * already.
d1dd721f
MH
539 *
540 * See the above comment "Reference transaction updates" for more
541 * information.
caa4046c 542 */
b416af5b
RS
543int ref_transaction_create(struct ref_transaction *transaction,
544 const char *refname,
89f3bbdd 545 const struct object_id *new_oid,
fec14ec3 546 unsigned int flags, const char *msg,
b416af5b 547 struct strbuf *err);
caa4046c
MH
548
549/*
89f3bbdd 550 * Add a reference deletion to transaction. If old_oid is non-NULL,
d1dd721f 551 * then it holds the value that the reference should have had before
89f3bbdd 552 * the update (which must not be null_oid).
d1dd721f
MH
553 *
554 * See the above comment "Reference transaction updates" for more
555 * information.
caa4046c 556 */
8c8bdc0d
RS
557int ref_transaction_delete(struct ref_transaction *transaction,
558 const char *refname,
89f3bbdd 559 const struct object_id *old_oid,
fb5a6bb6 560 unsigned int flags, const char *msg,
8c8bdc0d 561 struct strbuf *err);
caa4046c 562
16180334 563/*
89f3bbdd 564 * Verify, within a transaction, that refname has the value old_oid,
565 * or, if old_oid is null_oid, then verify that the reference
566 * doesn't exist. old_oid must be non-NULL.
d1dd721f
MH
567 *
568 * See the above comment "Reference transaction updates" for more
569 * information.
16180334
MH
570 */
571int ref_transaction_verify(struct ref_transaction *transaction,
572 const char *refname,
89f3bbdd 573 const struct object_id *old_oid,
16180334
MH
574 unsigned int flags,
575 struct strbuf *err);
576
28e6a97e
RS
577/* Naming conflict (for example, the ref names A and A/B conflict). */
578#define TRANSACTION_NAME_CONFLICT -1
579/* All other errors. */
580#define TRANSACTION_GENERIC_ERROR -2
30173b88
MH
581
582/*
64127575 583 * Perform the preparatory stages of committing `transaction`. Acquire
30173b88
MH
584 * any needed locks, check preconditions, etc.; basically, do as much
585 * as possible to ensure that the transaction will be able to go
586 * through, stopping just short of making any irrevocable or
587 * user-visible changes. The updates that this function prepares can
588 * be finished up by calling `ref_transaction_commit()` or rolled back
589 * by calling `ref_transaction_abort()`.
590 *
591 * On success, return 0 and leave the transaction in "prepared" state.
592 * On failure, abort the transaction, write an error message to `err`,
593 * and return one of the `TRANSACTION_*` constants.
594 *
64127575 595 * Callers who don't need such fine-grained control over committing
30173b88
MH
596 * reference transactions should just call `ref_transaction_commit()`.
597 */
598int ref_transaction_prepare(struct ref_transaction *transaction,
599 struct strbuf *err);
600
601/*
602 * Commit all of the changes that have been queued in transaction, as
603 * atomically as possible. On success, return 0 and leave the
604 * transaction in "closed" state. On failure, roll back the
605 * transaction, write an error message to `err`, and return one of the
606 * `TRANSACTION_*` constants
607 */
caa4046c 608int ref_transaction_commit(struct ref_transaction *transaction,
db7516ab 609 struct strbuf *err);
caa4046c 610
30173b88
MH
611/*
612 * Abort `transaction`, which has been begun and possibly prepared,
613 * but not yet committed.
614 */
615int ref_transaction_abort(struct ref_transaction *transaction,
616 struct strbuf *err);
617
58f233ce
MH
618/*
619 * Like ref_transaction_commit(), but optimized for creating
620 * references when originally initializing a repository (e.g., by "git
621 * clone"). It writes the new references directly to packed-refs
622 * without locking the individual references.
623 *
624 * It is a bug to call this function when there might be other
625 * processes accessing the repository or if there are existing
626 * references that might conflict with the ones being created. All
627 * old_sha1 values must either be absent or NULL_SHA1.
628 */
629int initial_ref_transaction_commit(struct ref_transaction *transaction,
630 struct strbuf *err);
631
026bd1d3 632/*
30173b88 633 * Free `*transaction` and all associated data.
026bd1d3
RS
634 */
635void ref_transaction_free(struct ref_transaction *transaction);
636
4b7b520b
MH
637/**
638 * Lock, update, and unlock a single reference. This function
639 * basically does a transaction containing a single call to
640 * ref_transaction_update(). The parameters to this function have the
641 * same meaning as the corresponding parameters to
642 * ref_transaction_update(). Handle errors as requested by the `onerr`
643 * argument.
644 */
c0fe4e8b 645int refs_update_ref(struct ref_store *refs, const char *msg, const char *refname,
ae077771 646 const struct object_id *new_oid, const struct object_id *old_oid,
c0fe4e8b 647 unsigned int flags, enum action_on_err onerr);
4b7b520b 648int update_ref(const char *msg, const char *refname,
8f6dc7e3 649 const struct object_id *new_oid, const struct object_id *old_oid,
650 unsigned int flags, enum action_on_err onerr);
3d9f037c 651
1354c9b2 652int parse_hide_refs_config(const char *var, const char *value, const char *);
fb58c8d5 653
78a766ab
LF
654/*
655 * Check whether a ref is hidden. If no namespace is set, both the first and
656 * the second parameter point to the full ref name. If a namespace is set and
657 * the ref is inside that namespace, the first parameter is a pointer to the
658 * name of the ref with the namespace prefix removed. If a namespace is set and
659 * the ref is outside that namespace, the first parameter is NULL. The second
660 * parameter always points to the full ref name.
661 */
1354c9b2 662int ref_is_hidden(const char *, const char *);
daebaa78 663
266b1827
DT
664enum ref_type {
665 REF_TYPE_PER_WORKTREE,
666 REF_TYPE_PSEUDOREF,
667 REF_TYPE_NORMAL,
668};
669
670enum ref_type ref_type(const char *refname);
671
fa5b1830
MH
672enum expire_reflog_flags {
673 EXPIRE_REFLOGS_DRY_RUN = 1 << 0,
674 EXPIRE_REFLOGS_UPDATE_REF = 1 << 1,
675 EXPIRE_REFLOGS_VERBOSE = 1 << 2,
676 EXPIRE_REFLOGS_REWRITE = 1 << 3
677};
678
679/*
680 * The following interface is used for reflog expiration. The caller
681 * calls reflog_expire(), supplying it with three callback functions,
682 * of the following types. The callback functions define the
683 * expiration policy that is desired.
684 *
685 * reflog_expiry_prepare_fn -- Called once after the reference is
686 * locked.
687 *
688 * reflog_expiry_should_prune_fn -- Called once for each entry in the
689 * existing reflog. It should return true iff that entry should be
690 * pruned.
691 *
692 * reflog_expiry_cleanup_fn -- Called once before the reference is
693 * unlocked again.
694 */
695typedef void reflog_expiry_prepare_fn(const char *refname,
4322478a 696 const struct object_id *oid,
fa5b1830 697 void *cb_data);
4322478a 698typedef int reflog_expiry_should_prune_fn(struct object_id *ooid,
699 struct object_id *noid,
fa5b1830 700 const char *email,
dddbad72 701 timestamp_t timestamp, int tz,
fa5b1830
MH
702 const char *message, void *cb_data);
703typedef void reflog_expiry_cleanup_fn(void *cb_data);
704
705/*
0155f710 706 * Expire reflog entries for the specified reference. oid is the old
fa5b1830
MH
707 * value of the reference. flags is a combination of the constants in
708 * enum expire_reflog_flags. The three function pointers are described
709 * above. On success, return zero.
710 */
7d2df051
NTND
711int refs_reflog_expire(struct ref_store *refs,
712 const char *refname,
0155f710 713 const struct object_id *oid,
7d2df051
NTND
714 unsigned int flags,
715 reflog_expiry_prepare_fn prepare_fn,
716 reflog_expiry_should_prune_fn should_prune_fn,
717 reflog_expiry_cleanup_fn cleanup_fn,
718 void *policy_cb_data);
0155f710 719int reflog_expire(const char *refname, const struct object_id *oid,
1354c9b2
MH
720 unsigned int flags,
721 reflog_expiry_prepare_fn prepare_fn,
722 reflog_expiry_should_prune_fn should_prune_fn,
723 reflog_expiry_cleanup_fn cleanup_fn,
724 void *policy_cb_data);
fa5b1830 725
3dce444f
RS
726int ref_storage_backend_exists(const char *name);
727
077be78d 728struct ref_store *get_main_ref_store(void);
18d0002d
NTND
729/*
730 * Return the ref_store instance for the specified submodule. For the
731 * main repository, use submodule==NULL; such a call cannot fail. For
732 * a submodule, the submodule must exist and be a nonbare repository,
733 * otherwise return NULL. If the requested reference store has not yet
734 * been initialized, initialize it first.
735 *
736 * For backwards compatibility, submodule=="" is treated the same as
737 * submodule==NULL.
738 */
739struct ref_store *get_submodule_ref_store(const char *submodule);
17eff96b 740struct ref_store *get_worktree_ref_store(const struct worktree *wt);
077be78d 741
95fc7512 742#endif /* REFS_H */