repack_without_refs(): make function private
[git/git.git] / refs.h
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1#ifndef REFS_H
2#define REFS_H
3
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4/*
5 * A ref_transaction represents a collection of ref updates
6 * that should succeed or fail together.
7 *
8 * Calling sequence
9 * ----------------
10 * - Allocate and initialize a `struct ref_transaction` by calling
11 * `ref_transaction_begin()`.
12 *
13 * - List intended ref updates by calling functions like
14 * `ref_transaction_update()` and `ref_transaction_create()`.
15 *
16 * - Call `ref_transaction_commit()` to execute the transaction.
17 * If this succeeds, the ref updates will have taken place and
18 * the transaction cannot be rolled back.
19 *
20 * - At any time call `ref_transaction_free()` to discard the
21 * transaction and free associated resources. In particular,
22 * this rolls back the transaction if it has not been
23 * successfully committed.
24 *
25 * Error handling
26 * --------------
27 *
28 * On error, transaction functions append a message about what
29 * went wrong to the 'err' argument. The message mentions what
30 * ref was being updated (if any) when the error occurred so it
31 * can be passed to 'die' or 'error' as-is.
32 *
33 * The message is appended to err without first clearing err.
34 * err will not be '\n' terminated.
35 */
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36struct ref_transaction;
37
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38/*
39 * Bit values set in the flags argument passed to each_ref_fn():
40 */
41
42/* Reference is a symbolic reference. */
98ac34b2 43#define REF_ISSYMREF 0x01
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44
45/* Reference is a packed reference. */
98ac34b2 46#define REF_ISPACKED 0x02
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47
48/*
49 * Reference cannot be resolved to an object name: dangling symbolic
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50 * reference (directly or indirectly), corrupt reference file,
51 * reference exists but name is bad, or symbolic reference refers to
52 * ill-formatted reference name.
89df9c84 53 */
98ac34b2 54#define REF_ISBROKEN 0x04
f4204ab9 55
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56/*
57 * Reference name is not well formed.
58 *
59 * See git-check-ref-format(1) for the definition of well formed ref names.
60 */
61#define REF_BAD_NAME 0x08
62
8a65ff76 63/*
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64 * The signature for the callback function for the for_each_*()
65 * functions below. The memory pointed to by the refname and sha1
66 * arguments is only guaranteed to be valid for the duration of a
67 * single callback invocation.
68 */
69typedef int each_ref_fn(const char *refname,
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70 const struct object_id *oid, int flags, void *cb_data);
71
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72/*
73 * The following functions invoke the specified callback function for
74 * each reference indicated. If the function ever returns a nonzero
75 * value, stop the iteration and return that value. Please note that
76 * it is not safe to modify references while an iteration is in
77 * progress, unless the same callback function invocation that
78 * modifies the reference also returns a nonzero value to immediately
79 * stop the iteration.
8a65ff76 80 */
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81extern int head_ref(each_ref_fn, void *);
82extern int for_each_ref(each_ref_fn, void *);
2a8177b6 83extern int for_each_ref_in(const char *, each_ref_fn, void *);
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84extern int for_each_tag_ref(each_ref_fn, void *);
85extern int for_each_branch_ref(each_ref_fn, void *);
86extern int for_each_remote_ref(each_ref_fn, void *);
29268700 87extern int for_each_replace_ref(each_ref_fn, void *);
d08bae7e 88extern int for_each_glob_ref(each_ref_fn, const char *pattern, void *);
b09fe971 89extern int for_each_glob_ref_in(each_ref_fn, const char *pattern, const char* prefix, void *);
8a65ff76 90
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91extern int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
92extern int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
93extern int for_each_ref_in_submodule(const char *submodule, const char *prefix,
94 each_ref_fn fn, void *cb_data);
95extern int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
96extern int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
97extern int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
98
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99extern int head_ref_namespaced(each_ref_fn fn, void *cb_data);
100extern int for_each_namespaced_ref(each_ref_fn fn, void *cb_data);
101
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102static inline const char *has_glob_specials(const char *pattern)
103{
104 return strpbrk(pattern, "?*[");
105}
106
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107/* can be used to learn about broken ref and symref */
108extern int for_each_rawref(each_ref_fn, void *);
109
3cf6134a 110extern void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname);
24d36f14 111extern void warn_dangling_symrefs(FILE *fp, const char *msg_fmt, const struct string_list *refnames);
f8948e2f 112
30249ee6 113/*
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114 * Lock the packed-refs file for writing. Flags is passed to
115 * hold_lock_file_for_update(). Return 0 on success.
447ff1bf 116 * Errno is set to something meaningful on error.
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117 */
118extern int lock_packed_refs(int flags);
119
120/*
121 * Add a reference to the in-memory packed reference cache. This may
122 * only be called while the packed-refs file is locked (see
123 * lock_packed_refs()). To actually write the packed-refs file, call
124 * commit_packed_refs().
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125 */
126extern void add_packed_ref(const char *refname, const unsigned char *sha1);
127
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128/*
129 * Write the current version of the packed refs cache from memory to
130 * disk. The packed-refs file must already be locked for writing (see
131 * lock_packed_refs()). Return zero on success.
d3f66555 132 * Sets errno to something meaningful on error.
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133 */
134extern int commit_packed_refs(void);
135
136/*
137 * Rollback the lockfile for the packed-refs file, and discard the
138 * in-memory packed reference cache. (The packed-refs file will be
139 * read anew if it is needed again after this function is called.)
140 */
141extern void rollback_packed_refs(void);
142
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143/*
144 * Flags for controlling behaviour of pack_refs()
145 * PACK_REFS_PRUNE: Prune loose refs after packing
146 * PACK_REFS_ALL: Pack _all_ refs, not just tags and already packed refs
147 */
148#define PACK_REFS_PRUNE 0x0001
149#define PACK_REFS_ALL 0x0002
150
151/*
152 * Write a packed-refs file for the current repository.
153 * flags: Combination of the above PACK_REFS_* flags.
154 */
155int pack_refs(unsigned int flags);
156
2c5c66be 157extern int ref_exists(const char *);
e142a3c6 158
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159extern int is_branch(const char *refname);
160
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161/*
162 * If refname is a non-symbolic reference that refers to a tag object,
163 * and the tag can be (recursively) dereferenced to a non-tag object,
164 * store the SHA1 of the referred-to object to sha1 and return 0. If
165 * any of these conditions are not met, return a non-zero value.
166 * Symbolic references are considered unpeelable, even if they
167 * ultimately resolve to a peelable tag.
168 */
dfefa935 169extern int peel_ref(const char *refname, unsigned char *sha1);
cf0adba7 170
835e3c99 171/*
31e07f76 172 * Flags controlling ref_transaction_update(), ref_transaction_create(), etc.
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173 * REF_NODEREF: act on the ref directly, instead of dereferencing
174 * symbolic references.
175 *
581d4e0c 176 * Other flags are reserved for internal use.
835e3c99 177 */
68db31cc 178#define REF_NODEREF 0x01
95fc7512 179
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180/*
181 * Setup reflog before using. Set errno to something meaningful on failure.
182 */
1a83c240 183int log_ref_setup(const char *refname, struct strbuf *logfile);
859c3017 184
d556fae2 185/** Reads log for the value of ref during at_time. **/
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186extern int read_ref_at(const char *refname, unsigned int flags,
187 unsigned long at_time, int cnt,
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188 unsigned char *sha1, char **msg,
189 unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt);
d556fae2 190
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191/** Check if a particular reflog exists */
192extern int reflog_exists(const char *refname);
193
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194/*
195 * Delete the specified reference. If old_sha1 is non-NULL and not
196 * NULL_SHA1, then verify that the current value of the reference is
197 * old_sha1 before deleting it. If old_sha1 is NULL or NULL_SHA1,
198 * delete the reference if it exists, regardless of its old value.
199 * flags is passed through to ref_transaction_delete().
200 */
201extern int delete_ref(const char *refname, const unsigned char *old_sha1,
202 unsigned int flags);
203
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204/*
205 * Delete the specified references. If there are any problems, emit
206 * errors but attempt to keep going (i.e., the deletes are not done in
207 * an all-or-nothing transaction).
208 */
209extern int delete_refs(struct string_list *refnames);
210
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211/** Delete a reflog */
212extern int delete_reflog(const char *refname);
213
2ff81662 214/* iterate over reflog entries */
883d60fa 215typedef int each_reflog_ent_fn(unsigned char *osha1, unsigned char *nsha1, const char *, unsigned long, int, const char *, void *);
dfefa935 216int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data);
98f85ff4 217int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn, void *cb_data);
2ff81662 218
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219/*
220 * Calls the specified function for each reflog file until it returns nonzero,
221 * and returns the value
222 */
223extern int for_each_reflog(each_ref_fn, void *);
224
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225#define REFNAME_ALLOW_ONELEVEL 1
226#define REFNAME_REFSPEC_PATTERN 2
227
228/*
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229 * Return 0 iff refname has the correct format for a refname according
230 * to the rules described in Documentation/git-check-ref-format.txt.
231 * If REFNAME_ALLOW_ONELEVEL is set in flags, then accept one-level
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232 * reference names. If REFNAME_REFSPEC_PATTERN is set in flags, then
233 * allow a "*" wildcard character in place of one of the name
f3cc52d8 234 * components. No leading or repeated slashes are accepted.
8d9c5010 235 */
dfefa935 236extern int check_refname_format(const char *refname, int flags);
95fc7512 237
4577e483 238extern const char *prettify_refname(const char *refname);
dfefa935 239extern char *shorten_unambiguous_ref(const char *refname, int strict);
a9c37a72 240
c976d415 241/** rename ref, return 0 on success **/
678d0f4c 242extern int rename_ref(const char *oldref, const char *newref, const char *logmsg);
c976d415 243
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244/**
245 * Resolve refname in the nested "gitlink" repository that is located
246 * at path. If the resolution is successful, return 0 and set sha1 to
247 * the name of the object; otherwise, return a non-zero value.
248 */
249extern int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1);
0ebde32c 250
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251enum action_on_err {
252 UPDATE_REFS_MSG_ON_ERR,
253 UPDATE_REFS_DIE_ON_ERR,
254 UPDATE_REFS_QUIET_ON_ERR
255};
256
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257/*
258 * Begin a reference transaction. The reference transaction must
33f9fc59 259 * be freed by calling ref_transaction_free().
caa4046c 260 */
93a644ea 261struct ref_transaction *ref_transaction_begin(struct strbuf *err);
caa4046c 262
caa4046c 263/*
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264 * Reference transaction updates
265 *
266 * The following four functions add a reference check or update to a
267 * ref_transaction. They have some common similar parameters:
268 *
269 * transaction -- a pointer to an open ref_transaction, obtained
270 * from ref_transaction_begin().
271 *
272 * refname -- the name of the reference to be affected.
273 *
274 * flags -- flags affecting the update, passed to
275 * update_ref_lock(). Can be REF_NODEREF, which means that
276 * symbolic references should not be followed.
277 *
278 * msg -- a message describing the change (for the reflog).
279 *
280 * err -- a strbuf for receiving a description of any error that
281 * might have occured.
282 *
283 * The functions make internal copies of refname and msg, so the
284 * caller retains ownership of these parameters.
285 *
286 * The functions return 0 on success and non-zero on failure. A
287 * failure means that the transaction as a whole has failed and needs
288 * to be rolled back.
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289 */
290
caa4046c 291/*
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292 * Add a reference update to transaction. new_sha1 is the value that
293 * the reference should have after the update, or null_sha1 if it
294 * should be deleted. If new_sha1 is NULL, then the reference is not
295 * changed at all. old_sha1 is the value that the reference must have
296 * before the update, or null_sha1 if it must not have existed
297 * beforehand. The old value is checked after the lock is taken to
298 * prevent races. If the old value doesn't agree with old_sha1, the
299 * whole transaction fails. If old_sha1 is NULL, then the previous
300 * value is not checked.
301 *
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302 * See the above comment "Reference transaction updates" for more
303 * information.
caa4046c 304 */
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305int ref_transaction_update(struct ref_transaction *transaction,
306 const char *refname,
307 const unsigned char *new_sha1,
308 const unsigned char *old_sha1,
1d147bdf 309 unsigned int flags, const char *msg,
8e34800e 310 struct strbuf *err);
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311
312/*
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313 * Add a reference creation to transaction. new_sha1 is the value that
314 * the reference should have after the update; it must not be
315 * null_sha1. It is verified that the reference does not exist
caa4046c 316 * already.
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317 *
318 * See the above comment "Reference transaction updates" for more
319 * information.
caa4046c 320 */
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321int ref_transaction_create(struct ref_transaction *transaction,
322 const char *refname,
323 const unsigned char *new_sha1,
fec14ec3 324 unsigned int flags, const char *msg,
b416af5b 325 struct strbuf *err);
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326
327/*
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328 * Add a reference deletion to transaction. If old_sha1 is non-NULL,
329 * then it holds the value that the reference should have had before
330 * the update (which must not be null_sha1).
331 *
332 * See the above comment "Reference transaction updates" for more
333 * information.
caa4046c 334 */
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335int ref_transaction_delete(struct ref_transaction *transaction,
336 const char *refname,
337 const unsigned char *old_sha1,
fb5a6bb6 338 unsigned int flags, const char *msg,
8c8bdc0d 339 struct strbuf *err);
caa4046c 340
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341/*
342 * Verify, within a transaction, that refname has the value old_sha1,
343 * or, if old_sha1 is null_sha1, then verify that the reference
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344 * doesn't exist. old_sha1 must be non-NULL.
345 *
346 * See the above comment "Reference transaction updates" for more
347 * information.
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348 */
349int ref_transaction_verify(struct ref_transaction *transaction,
350 const char *refname,
351 const unsigned char *old_sha1,
352 unsigned int flags,
353 struct strbuf *err);
354
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355/*
356 * Commit all of the changes that have been queued in transaction, as
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357 * atomically as possible.
358 *
359 * Returns 0 for success, or one of the below error codes for errors.
caa4046c 360 */
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361/* Naming conflict (for example, the ref names A and A/B conflict). */
362#define TRANSACTION_NAME_CONFLICT -1
363/* All other errors. */
364#define TRANSACTION_GENERIC_ERROR -2
caa4046c 365int ref_transaction_commit(struct ref_transaction *transaction,
db7516ab 366 struct strbuf *err);
caa4046c 367
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368/*
369 * Free an existing transaction and all associated data.
370 */
371void ref_transaction_free(struct ref_transaction *transaction);
372
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373/**
374 * Lock, update, and unlock a single reference. This function
375 * basically does a transaction containing a single call to
376 * ref_transaction_update(). The parameters to this function have the
377 * same meaning as the corresponding parameters to
378 * ref_transaction_update(). Handle errors as requested by the `onerr`
379 * argument.
380 */
381int update_ref(const char *msg, const char *refname,
382 const unsigned char *new_sha1, const unsigned char *old_sha1,
fec14ec3 383 unsigned int flags, enum action_on_err onerr);
3d9f037c 384
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385extern int parse_hide_refs_config(const char *var, const char *value, const char *);
386extern int ref_is_hidden(const char *);
387
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388enum expire_reflog_flags {
389 EXPIRE_REFLOGS_DRY_RUN = 1 << 0,
390 EXPIRE_REFLOGS_UPDATE_REF = 1 << 1,
391 EXPIRE_REFLOGS_VERBOSE = 1 << 2,
392 EXPIRE_REFLOGS_REWRITE = 1 << 3
393};
394
395/*
396 * The following interface is used for reflog expiration. The caller
397 * calls reflog_expire(), supplying it with three callback functions,
398 * of the following types. The callback functions define the
399 * expiration policy that is desired.
400 *
401 * reflog_expiry_prepare_fn -- Called once after the reference is
402 * locked.
403 *
404 * reflog_expiry_should_prune_fn -- Called once for each entry in the
405 * existing reflog. It should return true iff that entry should be
406 * pruned.
407 *
408 * reflog_expiry_cleanup_fn -- Called once before the reference is
409 * unlocked again.
410 */
411typedef void reflog_expiry_prepare_fn(const char *refname,
412 const unsigned char *sha1,
413 void *cb_data);
414typedef int reflog_expiry_should_prune_fn(unsigned char *osha1,
415 unsigned char *nsha1,
416 const char *email,
417 unsigned long timestamp, int tz,
418 const char *message, void *cb_data);
419typedef void reflog_expiry_cleanup_fn(void *cb_data);
420
421/*
422 * Expire reflog entries for the specified reference. sha1 is the old
423 * value of the reference. flags is a combination of the constants in
424 * enum expire_reflog_flags. The three function pointers are described
425 * above. On success, return zero.
426 */
427extern int reflog_expire(const char *refname, const unsigned char *sha1,
428 unsigned int flags,
429 reflog_expiry_prepare_fn prepare_fn,
430 reflog_expiry_should_prune_fn should_prune_fn,
431 reflog_expiry_cleanup_fn cleanup_fn,
432 void *policy_cb_data);
433
95fc7512 434#endif /* REFS_H */