set_git_dir: handle feeding gitdir to itself
[git.git] / refs.h
blob6daa78eb50ddc195c6d5bfb568d0b05ab08f7923
1 #ifndef REFS_H
2 #define REFS_H
4 struct object_id;
5 struct ref_store;
6 struct strbuf;
7 struct string_list;
8 struct worktree;
11 * Resolve a reference, recursively following symbolic refererences.
13 * Store the referred-to object's name in sha1 and return the name of
14 * the non-symbolic reference that ultimately pointed at it. The
15 * return value, if not NULL, is a pointer into either a static buffer
16 * or the input ref.
18 * If the reference cannot be resolved to an object, the behavior
19 * depends on the RESOLVE_REF_READING flag:
21 * - If RESOLVE_REF_READING is set, return NULL.
23 * - If RESOLVE_REF_READING is not set, clear sha1 and return the name of
24 * the last reference name in the chain, which will either be a non-symbolic
25 * reference or an undefined reference. If this is a prelude to
26 * "writing" to the ref, the return value is the name of the ref
27 * that will actually be created or changed.
29 * If the RESOLVE_REF_NO_RECURSE flag is passed, only resolves one
30 * level of symbolic reference. The value stored in sha1 for a symbolic
31 * reference will always be null_sha1 in this case, and the return
32 * value is the reference that the symref refers to directly.
34 * If flags is non-NULL, set the value that it points to the
35 * combination of REF_ISPACKED (if the reference was found among the
36 * packed references), REF_ISSYMREF (if the initial reference was a
37 * symbolic reference), REF_BAD_NAME (if the reference name is ill
38 * formed --- see RESOLVE_REF_ALLOW_BAD_NAME below), and REF_ISBROKEN
39 * (if the ref is malformed or has a bad name). See refs.h for more detail
40 * on each flag.
42 * If ref is not a properly-formatted, normalized reference, return
43 * NULL. If more than MAXDEPTH recursive symbolic lookups are needed,
44 * give up and return NULL.
46 * RESOLVE_REF_ALLOW_BAD_NAME allows resolving refs even when their
47 * name is invalid according to git-check-ref-format(1). If the name
48 * is bad then the value stored in sha1 will be null_sha1 and the two
49 * flags REF_ISBROKEN and REF_BAD_NAME will be set.
51 * Even with RESOLVE_REF_ALLOW_BAD_NAME, names that escape the refs/
52 * directory and do not consist of all caps and underscores cannot be
53 * resolved. The function returns NULL for such ref names.
54 * Caps and underscores refers to the special refs, such as HEAD,
55 * FETCH_HEAD and friends, that all live outside of the refs/ directory.
57 #define RESOLVE_REF_READING 0x01
58 #define RESOLVE_REF_NO_RECURSE 0x02
59 #define RESOLVE_REF_ALLOW_BAD_NAME 0x04
61 const char *refs_resolve_ref_unsafe(struct ref_store *refs,
62 const char *refname,
63 int resolve_flags,
64 unsigned char *sha1,
65 int *flags);
66 const char *resolve_ref_unsafe(const char *refname, int resolve_flags,
67 unsigned char *sha1, int *flags);
69 char *refs_resolve_refdup(struct ref_store *refs,
70 const char *refname, int resolve_flags,
71 unsigned char *sha1, int *flags);
72 char *resolve_refdup(const char *refname, int resolve_flags,
73 unsigned char *sha1, int *flags);
75 int refs_read_ref_full(struct ref_store *refs, const char *refname,
76 int resolve_flags, unsigned char *sha1, int *flags);
77 int read_ref_full(const char *refname, int resolve_flags,
78 unsigned char *sha1, int *flags);
79 int read_ref(const char *refname, unsigned char *sha1);
82 * Return 0 if a reference named refname could be created without
83 * conflicting with the name of an existing reference. Otherwise,
84 * return a negative value and write an explanation to err. If extras
85 * is non-NULL, it is a list of additional refnames with which refname
86 * is not allowed to conflict. If skip is non-NULL, ignore potential
87 * conflicts with refs in skip (e.g., because they are scheduled for
88 * deletion in the same operation). Behavior is undefined if the same
89 * name is listed in both extras and skip.
91 * Two reference names conflict if one of them exactly matches the
92 * leading components of the other; e.g., "foo/bar" conflicts with
93 * both "foo" and with "foo/bar/baz" but not with "foo/bar" or
94 * "foo/barbados".
96 * extras and skip must be sorted.
99 int refs_verify_refname_available(struct ref_store *refs,
100 const char *refname,
101 const struct string_list *extras,
102 const struct string_list *skip,
103 struct strbuf *err);
105 int ref_exists(const char *refname);
107 int should_autocreate_reflog(const char *refname);
109 int is_branch(const char *refname);
111 extern int refs_init_db(struct strbuf *err);
114 * If refname is a non-symbolic reference that refers to a tag object,
115 * and the tag can be (recursively) dereferenced to a non-tag object,
116 * store the SHA1 of the referred-to object to sha1 and return 0. If
117 * any of these conditions are not met, return a non-zero value.
118 * Symbolic references are considered unpeelable, even if they
119 * ultimately resolve to a peelable tag.
121 int refs_peel_ref(struct ref_store *refs, const char *refname,
122 unsigned char *sha1);
123 int peel_ref(const char *refname, unsigned char *sha1);
126 * Resolve refname in the nested "gitlink" repository in the specified
127 * submodule (which must be non-NULL). If the resolution is
128 * successful, return 0 and set sha1 to the name of the object;
129 * otherwise, return a non-zero value.
131 int resolve_gitlink_ref(const char *submodule, const char *refname,
132 unsigned char *sha1);
135 * Return true iff abbrev_name is a possible abbreviation for
136 * full_name according to the rules defined by ref_rev_parse_rules in
137 * refs.c.
139 int refname_match(const char *abbrev_name, const char *full_name);
141 int expand_ref(const char *str, int len, unsigned char *sha1, char **ref);
142 int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
143 int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
146 * A ref_transaction represents a collection of reference updates that
147 * should succeed or fail together.
149 * Calling sequence
150 * ----------------
152 * - Allocate and initialize a `struct ref_transaction` by calling
153 * `ref_transaction_begin()`.
155 * - Specify the intended ref updates by calling one or more of the
156 * following functions:
157 * - `ref_transaction_update()`
158 * - `ref_transaction_create()`
159 * - `ref_transaction_delete()`
160 * - `ref_transaction_verify()`
162 * - Then either:
164 * - Optionally call `ref_transaction_prepare()` to prepare the
165 * transaction. This locks all references, checks preconditions,
166 * etc. but doesn't finalize anything. If this step fails, the
167 * transaction has been closed and can only be freed. If this step
168 * succeeds, then `ref_transaction_commit()` is almost certain to
169 * succeed. However, you can still call `ref_transaction_abort()`
170 * if you decide not to commit the transaction after all.
172 * - Call `ref_transaction_commit()` to execute the transaction,
173 * make the changes permanent, and release all locks. If you
174 * haven't already called `ref_transaction_prepare()`, then
175 * `ref_transaction_commit()` calls it for you.
177 * Or
179 * - Call `initial_ref_transaction_commit()` if the ref database is
180 * known to be empty and have no other writers (e.g. during
181 * clone). This is likely to be much faster than
182 * `ref_transaction_commit()`. `ref_transaction_prepare()` should
183 * *not* be called before `initial_ref_transaction_commit()`.
185 * - Then finally, call `ref_transaction_free()` to free the
186 * `ref_transaction` data structure.
188 * At any time before calling `ref_transaction_commit()`, you can call
189 * `ref_transaction_abort()` to abort the transaction, rollback any
190 * locks, and free any associated resources (including the
191 * `ref_transaction` data structure).
193 * Putting it all together, a complete reference update looks like
195 * struct ref_transaction *transaction;
196 * struct strbuf err = STRBUF_INIT;
197 * int ret = 0;
199 * transaction = ref_store_transaction_begin(refs, &err);
200 * if (!transaction ||
201 * ref_transaction_update(...) ||
202 * ref_transaction_create(...) ||
203 * ...etc... ||
204 * ref_transaction_commit(transaction, &err)) {
205 * error("%s", err.buf);
206 * ret = -1;
208 * ref_transaction_free(transaction);
209 * strbuf_release(&err);
210 * return ret;
212 * Error handling
213 * --------------
215 * On error, transaction functions append a message about what
216 * went wrong to the 'err' argument. The message mentions what
217 * ref was being updated (if any) when the error occurred so it
218 * can be passed to 'die' or 'error' as-is.
220 * The message is appended to err without first clearing err.
221 * err will not be '\n' terminated.
223 * Caveats
224 * -------
226 * Note that no locks are taken, and no refs are read, until
227 * `ref_transaction_prepare()` or `ref_transaction_commit()` is
228 * called. So, for example, `ref_transaction_verify()` won't report a
229 * verification failure until the commit is attempted.
231 struct ref_transaction;
234 * Bit values set in the flags argument passed to each_ref_fn() and
235 * stored in ref_iterator::flags. Other bits are for internal use
236 * only:
239 /* Reference is a symbolic reference. */
240 #define REF_ISSYMREF 0x01
242 /* Reference is a packed reference. */
243 #define REF_ISPACKED 0x02
246 * Reference cannot be resolved to an object name: dangling symbolic
247 * reference (directly or indirectly), corrupt reference file,
248 * reference exists but name is bad, or symbolic reference refers to
249 * ill-formatted reference name.
251 #define REF_ISBROKEN 0x04
254 * Reference name is not well formed.
256 * See git-check-ref-format(1) for the definition of well formed ref names.
258 #define REF_BAD_NAME 0x08
261 * The signature for the callback function for the for_each_*()
262 * functions below. The memory pointed to by the refname and sha1
263 * arguments is only guaranteed to be valid for the duration of a
264 * single callback invocation.
266 typedef int each_ref_fn(const char *refname,
267 const struct object_id *oid, int flags, void *cb_data);
270 * The following functions invoke the specified callback function for
271 * each reference indicated. If the function ever returns a nonzero
272 * value, stop the iteration and return that value. Please note that
273 * it is not safe to modify references while an iteration is in
274 * progress, unless the same callback function invocation that
275 * modifies the reference also returns a nonzero value to immediately
276 * stop the iteration. Returned references are sorted.
278 int refs_for_each_ref(struct ref_store *refs,
279 each_ref_fn fn, void *cb_data);
280 int refs_for_each_ref_in(struct ref_store *refs, const char *prefix,
281 each_ref_fn fn, void *cb_data);
282 int refs_for_each_tag_ref(struct ref_store *refs,
283 each_ref_fn fn, void *cb_data);
284 int refs_for_each_branch_ref(struct ref_store *refs,
285 each_ref_fn fn, void *cb_data);
286 int refs_for_each_remote_ref(struct ref_store *refs,
287 each_ref_fn fn, void *cb_data);
289 int head_ref(each_ref_fn fn, void *cb_data);
290 int for_each_ref(each_ref_fn fn, void *cb_data);
291 int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data);
292 int for_each_fullref_in(const char *prefix, each_ref_fn fn, void *cb_data,
293 unsigned int broken);
294 int for_each_tag_ref(each_ref_fn fn, void *cb_data);
295 int for_each_branch_ref(each_ref_fn fn, void *cb_data);
296 int for_each_remote_ref(each_ref_fn fn, void *cb_data);
297 int for_each_replace_ref(each_ref_fn fn, void *cb_data);
298 int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data);
299 int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
300 const char *prefix, void *cb_data);
302 int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
303 int for_each_ref_submodule(const char *submodule,
304 each_ref_fn fn, void *cb_data);
305 int for_each_ref_in_submodule(const char *submodule, const char *prefix,
306 each_ref_fn fn, void *cb_data);
307 int for_each_fullref_in_submodule(const char *submodule, const char *prefix,
308 each_ref_fn fn, void *cb_data,
309 unsigned int broken);
310 int for_each_tag_ref_submodule(const char *submodule,
311 each_ref_fn fn, void *cb_data);
312 int for_each_branch_ref_submodule(const char *submodule,
313 each_ref_fn fn, void *cb_data);
314 int for_each_remote_ref_submodule(const char *submodule,
315 each_ref_fn fn, void *cb_data);
317 int head_ref_namespaced(each_ref_fn fn, void *cb_data);
318 int for_each_namespaced_ref(each_ref_fn fn, void *cb_data);
320 /* can be used to learn about broken ref and symref */
321 int refs_for_each_rawref(struct ref_store *refs, each_ref_fn fn, void *cb_data);
322 int for_each_rawref(each_ref_fn fn, void *cb_data);
324 static inline const char *has_glob_specials(const char *pattern)
326 return strpbrk(pattern, "?*[");
329 void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname);
330 void warn_dangling_symrefs(FILE *fp, const char *msg_fmt,
331 const struct string_list *refnames);
334 * Flags for controlling behaviour of pack_refs()
335 * PACK_REFS_PRUNE: Prune loose refs after packing
336 * PACK_REFS_ALL: Pack _all_ refs, not just tags and already packed refs
338 #define PACK_REFS_PRUNE 0x0001
339 #define PACK_REFS_ALL 0x0002
342 * Write a packed-refs file for the current repository.
343 * flags: Combination of the above PACK_REFS_* flags.
345 int refs_pack_refs(struct ref_store *refs, unsigned int flags);
348 * Flags controlling ref_transaction_update(), ref_transaction_create(), etc.
349 * REF_NODEREF: act on the ref directly, instead of dereferencing
350 * symbolic references.
352 * Other flags are reserved for internal use.
354 #define REF_NODEREF 0x01
355 #define REF_FORCE_CREATE_REFLOG 0x40
358 * Setup reflog before using. Fill in err and return -1 on failure.
360 int refs_create_reflog(struct ref_store *refs, const char *refname,
361 int force_create, struct strbuf *err);
362 int safe_create_reflog(const char *refname, int force_create, struct strbuf *err);
364 /** Reads log for the value of ref during at_time. **/
365 int read_ref_at(const char *refname, unsigned int flags,
366 timestamp_t at_time, int cnt,
367 unsigned char *sha1, char **msg,
368 timestamp_t *cutoff_time, int *cutoff_tz, int *cutoff_cnt);
370 /** Check if a particular reflog exists */
371 int refs_reflog_exists(struct ref_store *refs, const char *refname);
372 int reflog_exists(const char *refname);
375 * Delete the specified reference. If old_sha1 is non-NULL, then
376 * verify that the current value of the reference is old_sha1 before
377 * deleting it. If old_sha1 is NULL, delete the reference if it
378 * exists, regardless of its old value. It is an error for old_sha1 to
379 * be NULL_SHA1. msg and flags are passed through to
380 * ref_transaction_delete().
382 int refs_delete_ref(struct ref_store *refs, const char *msg,
383 const char *refname,
384 const unsigned char *old_sha1,
385 unsigned int flags);
386 int delete_ref(const char *msg, const char *refname,
387 const unsigned char *old_sha1, unsigned int flags);
390 * Delete the specified references. If there are any problems, emit
391 * errors but attempt to keep going (i.e., the deletes are not done in
392 * an all-or-nothing transaction). msg and flags are passed through to
393 * ref_transaction_delete().
395 int refs_delete_refs(struct ref_store *refs, const char *msg,
396 struct string_list *refnames, unsigned int flags);
397 int delete_refs(const char *msg, struct string_list *refnames,
398 unsigned int flags);
400 /** Delete a reflog */
401 int refs_delete_reflog(struct ref_store *refs, const char *refname);
402 int delete_reflog(const char *refname);
404 /* iterate over reflog entries */
405 typedef int each_reflog_ent_fn(
406 struct object_id *old_oid, struct object_id *new_oid,
407 const char *committer, timestamp_t timestamp,
408 int tz, const char *msg, void *cb_data);
410 int refs_for_each_reflog_ent(struct ref_store *refs, const char *refname,
411 each_reflog_ent_fn fn, void *cb_data);
412 int refs_for_each_reflog_ent_reverse(struct ref_store *refs,
413 const char *refname,
414 each_reflog_ent_fn fn,
415 void *cb_data);
416 int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data);
417 int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn, void *cb_data);
420 * Calls the specified function for each reflog file until it returns nonzero,
421 * and returns the value. Reflog file order is unspecified.
423 int refs_for_each_reflog(struct ref_store *refs, each_ref_fn fn, void *cb_data);
424 int for_each_reflog(each_ref_fn fn, void *cb_data);
426 #define REFNAME_ALLOW_ONELEVEL 1
427 #define REFNAME_REFSPEC_PATTERN 2
430 * Return 0 iff refname has the correct format for a refname according
431 * to the rules described in Documentation/git-check-ref-format.txt.
432 * If REFNAME_ALLOW_ONELEVEL is set in flags, then accept one-level
433 * reference names. If REFNAME_REFSPEC_PATTERN is set in flags, then
434 * allow a single "*" wildcard character in the refspec. No leading or
435 * repeated slashes are accepted.
437 int check_refname_format(const char *refname, int flags);
439 const char *prettify_refname(const char *refname);
441 char *shorten_unambiguous_ref(const char *refname, int strict);
443 /** rename ref, return 0 on success **/
444 int refs_rename_ref(struct ref_store *refs, const char *oldref,
445 const char *newref, const char *logmsg);
446 int rename_ref(const char *oldref, const char *newref, const char *logmsg);
448 int refs_create_symref(struct ref_store *refs, const char *refname,
449 const char *target, const char *logmsg);
450 int create_symref(const char *refname, const char *target, const char *logmsg);
452 enum action_on_err {
453 UPDATE_REFS_MSG_ON_ERR,
454 UPDATE_REFS_DIE_ON_ERR,
455 UPDATE_REFS_QUIET_ON_ERR
459 * Begin a reference transaction. The reference transaction must
460 * be freed by calling ref_transaction_free().
462 struct ref_transaction *ref_store_transaction_begin(struct ref_store *refs,
463 struct strbuf *err);
464 struct ref_transaction *ref_transaction_begin(struct strbuf *err);
467 * Reference transaction updates
469 * The following four functions add a reference check or update to a
470 * ref_transaction. They have some common similar parameters:
472 * transaction -- a pointer to an open ref_transaction, obtained
473 * from ref_transaction_begin().
475 * refname -- the name of the reference to be affected.
477 * new_sha1 -- the SHA-1 that should be set to be the new value of
478 * the reference. Some functions allow this parameter to be
479 * NULL, meaning that the reference is not changed, or
480 * null_sha1, meaning that the reference should be deleted. A
481 * copy of this value is made in the transaction.
483 * old_sha1 -- the SHA-1 value that the reference must have before
484 * the update. Some functions allow this parameter to be NULL,
485 * meaning that the old value of the reference is not checked,
486 * or null_sha1, meaning that the reference must not exist
487 * before the update. A copy of this value is made in the
488 * transaction.
490 * flags -- flags affecting the update, passed to
491 * update_ref_lock(). Can be REF_NODEREF, which means that
492 * symbolic references should not be followed.
494 * msg -- a message describing the change (for the reflog).
496 * err -- a strbuf for receiving a description of any error that
497 * might have occurred.
499 * The functions make internal copies of refname and msg, so the
500 * caller retains ownership of these parameters.
502 * The functions return 0 on success and non-zero on failure. A
503 * failure means that the transaction as a whole has failed and needs
504 * to be rolled back.
508 * Add a reference update to transaction. new_sha1 is the value that
509 * the reference should have after the update, or null_sha1 if it
510 * should be deleted. If new_sha1 is NULL, then the reference is not
511 * changed at all. old_sha1 is the value that the reference must have
512 * before the update, or null_sha1 if it must not have existed
513 * beforehand. The old value is checked after the lock is taken to
514 * prevent races. If the old value doesn't agree with old_sha1, the
515 * whole transaction fails. If old_sha1 is NULL, then the previous
516 * value is not checked.
518 * See the above comment "Reference transaction updates" for more
519 * information.
521 int ref_transaction_update(struct ref_transaction *transaction,
522 const char *refname,
523 const unsigned char *new_sha1,
524 const unsigned char *old_sha1,
525 unsigned int flags, const char *msg,
526 struct strbuf *err);
529 * Add a reference creation to transaction. new_sha1 is the value that
530 * the reference should have after the update; it must not be
531 * null_sha1. It is verified that the reference does not exist
532 * already.
534 * See the above comment "Reference transaction updates" for more
535 * information.
537 int ref_transaction_create(struct ref_transaction *transaction,
538 const char *refname,
539 const unsigned char *new_sha1,
540 unsigned int flags, const char *msg,
541 struct strbuf *err);
544 * Add a reference deletion to transaction. If old_sha1 is non-NULL,
545 * then it holds the value that the reference should have had before
546 * the update (which must not be null_sha1).
548 * See the above comment "Reference transaction updates" for more
549 * information.
551 int ref_transaction_delete(struct ref_transaction *transaction,
552 const char *refname,
553 const unsigned char *old_sha1,
554 unsigned int flags, const char *msg,
555 struct strbuf *err);
558 * Verify, within a transaction, that refname has the value old_sha1,
559 * or, if old_sha1 is null_sha1, then verify that the reference
560 * doesn't exist. old_sha1 must be non-NULL.
562 * See the above comment "Reference transaction updates" for more
563 * information.
565 int ref_transaction_verify(struct ref_transaction *transaction,
566 const char *refname,
567 const unsigned char *old_sha1,
568 unsigned int flags,
569 struct strbuf *err);
571 /* Naming conflict (for example, the ref names A and A/B conflict). */
572 #define TRANSACTION_NAME_CONFLICT -1
573 /* All other errors. */
574 #define TRANSACTION_GENERIC_ERROR -2
577 * Perform the preparatory stages of committing `transaction`. Acquire
578 * any needed locks, check preconditions, etc.; basically, do as much
579 * as possible to ensure that the transaction will be able to go
580 * through, stopping just short of making any irrevocable or
581 * user-visible changes. The updates that this function prepares can
582 * be finished up by calling `ref_transaction_commit()` or rolled back
583 * by calling `ref_transaction_abort()`.
585 * On success, return 0 and leave the transaction in "prepared" state.
586 * On failure, abort the transaction, write an error message to `err`,
587 * and return one of the `TRANSACTION_*` constants.
589 * Callers who don't need such fine-grained control over committing
590 * reference transactions should just call `ref_transaction_commit()`.
592 int ref_transaction_prepare(struct ref_transaction *transaction,
593 struct strbuf *err);
596 * Commit all of the changes that have been queued in transaction, as
597 * atomically as possible. On success, return 0 and leave the
598 * transaction in "closed" state. On failure, roll back the
599 * transaction, write an error message to `err`, and return one of the
600 * `TRANSACTION_*` constants
602 int ref_transaction_commit(struct ref_transaction *transaction,
603 struct strbuf *err);
606 * Abort `transaction`, which has been begun and possibly prepared,
607 * but not yet committed.
609 int ref_transaction_abort(struct ref_transaction *transaction,
610 struct strbuf *err);
613 * Like ref_transaction_commit(), but optimized for creating
614 * references when originally initializing a repository (e.g., by "git
615 * clone"). It writes the new references directly to packed-refs
616 * without locking the individual references.
618 * It is a bug to call this function when there might be other
619 * processes accessing the repository or if there are existing
620 * references that might conflict with the ones being created. All
621 * old_sha1 values must either be absent or NULL_SHA1.
623 int initial_ref_transaction_commit(struct ref_transaction *transaction,
624 struct strbuf *err);
627 * Free `*transaction` and all associated data.
629 void ref_transaction_free(struct ref_transaction *transaction);
632 * Lock, update, and unlock a single reference. This function
633 * basically does a transaction containing a single call to
634 * ref_transaction_update(). The parameters to this function have the
635 * same meaning as the corresponding parameters to
636 * ref_transaction_update(). Handle errors as requested by the `onerr`
637 * argument.
639 int refs_update_ref(struct ref_store *refs, const char *msg, const char *refname,
640 const unsigned char *new_sha1, const unsigned char *old_sha1,
641 unsigned int flags, enum action_on_err onerr);
642 int update_ref(const char *msg, const char *refname,
643 const unsigned char *new_sha1, const unsigned char *old_sha1,
644 unsigned int flags, enum action_on_err onerr);
645 int update_ref_oid(const char *msg, const char *refname,
646 const struct object_id *new_oid, const struct object_id *old_oid,
647 unsigned int flags, enum action_on_err onerr);
649 int parse_hide_refs_config(const char *var, const char *value, const char *);
652 * Check whether a ref is hidden. If no namespace is set, both the first and
653 * the second parameter point to the full ref name. If a namespace is set and
654 * the ref is inside that namespace, the first parameter is a pointer to the
655 * name of the ref with the namespace prefix removed. If a namespace is set and
656 * the ref is outside that namespace, the first parameter is NULL. The second
657 * parameter always points to the full ref name.
659 int ref_is_hidden(const char *, const char *);
661 enum ref_type {
662 REF_TYPE_PER_WORKTREE,
663 REF_TYPE_PSEUDOREF,
664 REF_TYPE_NORMAL,
667 enum ref_type ref_type(const char *refname);
669 enum expire_reflog_flags {
670 EXPIRE_REFLOGS_DRY_RUN = 1 << 0,
671 EXPIRE_REFLOGS_UPDATE_REF = 1 << 1,
672 EXPIRE_REFLOGS_VERBOSE = 1 << 2,
673 EXPIRE_REFLOGS_REWRITE = 1 << 3
677 * The following interface is used for reflog expiration. The caller
678 * calls reflog_expire(), supplying it with three callback functions,
679 * of the following types. The callback functions define the
680 * expiration policy that is desired.
682 * reflog_expiry_prepare_fn -- Called once after the reference is
683 * locked.
685 * reflog_expiry_should_prune_fn -- Called once for each entry in the
686 * existing reflog. It should return true iff that entry should be
687 * pruned.
689 * reflog_expiry_cleanup_fn -- Called once before the reference is
690 * unlocked again.
692 typedef void reflog_expiry_prepare_fn(const char *refname,
693 const struct object_id *oid,
694 void *cb_data);
695 typedef int reflog_expiry_should_prune_fn(struct object_id *ooid,
696 struct object_id *noid,
697 const char *email,
698 timestamp_t timestamp, int tz,
699 const char *message, void *cb_data);
700 typedef void reflog_expiry_cleanup_fn(void *cb_data);
703 * Expire reflog entries for the specified reference. sha1 is the old
704 * value of the reference. flags is a combination of the constants in
705 * enum expire_reflog_flags. The three function pointers are described
706 * above. On success, return zero.
708 int refs_reflog_expire(struct ref_store *refs,
709 const char *refname,
710 const unsigned char *sha1,
711 unsigned int flags,
712 reflog_expiry_prepare_fn prepare_fn,
713 reflog_expiry_should_prune_fn should_prune_fn,
714 reflog_expiry_cleanup_fn cleanup_fn,
715 void *policy_cb_data);
716 int reflog_expire(const char *refname, const unsigned char *sha1,
717 unsigned int flags,
718 reflog_expiry_prepare_fn prepare_fn,
719 reflog_expiry_should_prune_fn should_prune_fn,
720 reflog_expiry_cleanup_fn cleanup_fn,
721 void *policy_cb_data);
723 int ref_storage_backend_exists(const char *name);
725 struct ref_store *get_main_ref_store(void);
727 * Return the ref_store instance for the specified submodule. For the
728 * main repository, use submodule==NULL; such a call cannot fail. For
729 * a submodule, the submodule must exist and be a nonbare repository,
730 * otherwise return NULL. If the requested reference store has not yet
731 * been initialized, initialize it first.
733 * For backwards compatibility, submodule=="" is treated the same as
734 * submodule==NULL.
736 struct ref_store *get_submodule_ref_store(const char *submodule);
737 struct ref_store *get_worktree_ref_store(const struct worktree *wt);
739 #endif /* REFS_H */