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4cb77009 MH |
1 | #ifndef REFS_REFS_INTERNAL_H |
2 | #define REFS_REFS_INTERNAL_H | |
3 | ||
4eb4416d RJ |
4 | #include "cache.h" |
5 | #include "refs.h" | |
13f925f3 | 6 | #include "iterator.h" |
91c2f204 | 7 | |
4eb4416d RJ |
8 | struct ref_transaction; |
9 | ||
4cb77009 MH |
10 | /* |
11 | * Data structures and functions for the internal use of the refs | |
12 | * module. Code outside of the refs module should use only the public | |
13 | * functions defined in "refs.h", and should *not* include this file. | |
14 | */ | |
15 | ||
16 | /* | |
5ac95fee | 17 | * The following flags can appear in `ref_update::flags`. Their |
91774afc | 18 | * numerical values must not conflict with those of REF_NO_DEREF and |
5ac95fee MH |
19 | * REF_FORCE_CREATE_REFLOG, which are also stored in |
20 | * `ref_update::flags`. | |
4cb77009 | 21 | */ |
4cb77009 MH |
22 | |
23 | /* | |
78fb4579 | 24 | * The reference should be updated to new_oid. |
4cb77009 | 25 | */ |
5ac95fee | 26 | #define REF_HAVE_NEW (1 << 2) |
4cb77009 MH |
27 | |
28 | /* | |
5ac95fee | 29 | * The current reference's value should be checked to make sure that |
78fb4579 | 30 | * it agrees with old_oid. |
4cb77009 | 31 | */ |
5ac95fee | 32 | #define REF_HAVE_OLD (1 << 3) |
44639777 | 33 | |
4ff0f01c MH |
34 | /* |
35 | * Return the length of time to retry acquiring a loose reference lock | |
36 | * before giving up, in milliseconds: | |
37 | */ | |
38 | long get_files_ref_lock_timeout_ms(void); | |
39 | ||
4cb77009 MH |
40 | /* |
41 | * Return true iff refname is minimally safe. "Safe" here means that | |
42 | * deleting a loose reference by this name will not do any damage, for | |
43 | * example by causing a file that is not a reference to be deleted. | |
44 | * This function does not check that the reference name is legal; for | |
45 | * that, use check_refname_format(). | |
46 | * | |
15ee2c72 MH |
47 | * A refname that starts with "refs/" is considered safe iff it |
48 | * doesn't contain any "." or ".." components or consecutive '/' | |
49 | * characters, end with '/', or (on Windows) contain any '\' | |
50 | * characters. Names that do not start with "refs/" are considered | |
51 | * safe iff they consist entirely of upper case characters and '_' | |
52 | * (like "HEAD" and "MERGE_HEAD" but not "config" or "FOO/BAR"). | |
4cb77009 MH |
53 | */ |
54 | int refname_is_safe(const char *refname); | |
55 | ||
67be7c5a MH |
56 | /* |
57 | * Helper function: return true if refname, which has the specified | |
58 | * oid and flags, can be resolved to an object in the database. If the | |
59 | * referred-to object does not exist, emit a warning and return false. | |
60 | */ | |
61 | int ref_resolves_to_object(const char *refname, | |
62 | const struct object_id *oid, | |
63 | unsigned int flags); | |
64 | ||
4cb77009 MH |
65 | enum peel_status { |
66 | /* object was peeled successfully: */ | |
67 | PEEL_PEELED = 0, | |
68 | ||
69 | /* | |
70 | * object cannot be peeled because the named object (or an | |
71 | * object referred to by a tag in the peel chain), does not | |
72 | * exist. | |
73 | */ | |
74 | PEEL_INVALID = -1, | |
75 | ||
76 | /* object cannot be peeled because it is not a tag: */ | |
77 | PEEL_NON_TAG = -2, | |
78 | ||
79 | /* ref_entry contains no peeled value because it is a symref: */ | |
80 | PEEL_IS_SYMREF = -3, | |
81 | ||
82 | /* | |
83 | * ref_entry cannot be peeled because it is broken (i.e., the | |
84 | * symbolic reference cannot even be resolved to an object | |
85 | * name): | |
86 | */ | |
87 | PEEL_BROKEN = -4 | |
88 | }; | |
89 | ||
90 | /* | |
91 | * Peel the named object; i.e., if the object is a tag, resolve the | |
92 | * tag recursively until a non-tag is found. If successful, store the | |
ac2ed0d7 | 93 | * result to oid and return PEEL_PEELED. If the object is not a tag |
4cb77009 | 94 | * or is not valid, return PEEL_NON_TAG or PEEL_INVALID, respectively, |
78fb4579 | 95 | * and leave oid unchanged. |
4cb77009 | 96 | */ |
ac2ed0d7 | 97 | enum peel_status peel_object(const struct object_id *name, struct object_id *oid); |
4cb77009 | 98 | |
4cb77009 | 99 | /** |
78fb4579 MH |
100 | * Information needed for a single ref update. Set new_oid to the new |
101 | * value or to null_oid to delete the ref. To check the old value | |
102 | * while the ref is locked, set (flags & REF_HAVE_OLD) and set old_oid | |
103 | * to the old value, or to null_oid to ensure the ref does not exist | |
104 | * before update. | |
4cb77009 MH |
105 | */ |
106 | struct ref_update { | |
107 | /* | |
5ac95fee MH |
108 | * If (flags & REF_HAVE_NEW), set the reference to this value |
109 | * (or delete it, if `new_oid` is `null_oid`). | |
4cb77009 | 110 | */ |
98491298 | 111 | struct object_id new_oid; |
6e30b2f6 | 112 | |
4cb77009 MH |
113 | /* |
114 | * If (flags & REF_HAVE_OLD), check that the reference | |
5ac95fee MH |
115 | * previously had this value (or didn't previously exist, if |
116 | * `old_oid` is `null_oid`). | |
4cb77009 | 117 | */ |
98491298 | 118 | struct object_id old_oid; |
6e30b2f6 | 119 | |
4cb77009 | 120 | /* |
91774afc | 121 | * One or more of REF_NO_DEREF, REF_FORCE_CREATE_REFLOG, |
5ac95fee | 122 | * REF_HAVE_NEW, REF_HAVE_OLD, or backend-specific flags. |
4cb77009 MH |
123 | */ |
124 | unsigned int flags; | |
6e30b2f6 | 125 | |
7d618264 | 126 | void *backend_data; |
92b1551b | 127 | unsigned int type; |
4cb77009 | 128 | char *msg; |
6e30b2f6 MH |
129 | |
130 | /* | |
131 | * If this ref_update was split off of a symref update via | |
132 | * split_symref_update(), then this member points at that | |
133 | * update. This is used for two purposes: | |
134 | * 1. When reporting errors, we report the refname under which | |
135 | * the update was originally requested. | |
136 | * 2. When we read the old value of this reference, we | |
137 | * propagate it back to its parent update for recording in | |
138 | * the latter's reflog. | |
139 | */ | |
140 | struct ref_update *parent_update; | |
141 | ||
4cb77009 MH |
142 | const char refname[FLEX_ARRAY]; |
143 | }; | |
144 | ||
470be518 | 145 | int refs_read_raw_ref(struct ref_store *ref_store, |
99afe91a | 146 | const char *refname, struct object_id *oid, |
470be518 MH |
147 | struct strbuf *referent, unsigned int *type); |
148 | ||
2ced105c MH |
149 | /* |
150 | * Write an error to `err` and return a nonzero value iff the same | |
151 | * refname appears multiple times in `refnames`. `refnames` must be | |
152 | * sorted on entry to this function. | |
153 | */ | |
154 | int ref_update_reject_duplicates(struct string_list *refnames, | |
155 | struct strbuf *err); | |
156 | ||
71564516 MH |
157 | /* |
158 | * Add a ref_update with the specified properties to transaction, and | |
159 | * return a pointer to the new object. This function does not verify | |
78fb4579 | 160 | * that refname is well-formed. new_oid and old_oid are only |
71564516 MH |
161 | * dereferenced if the REF_HAVE_NEW and REF_HAVE_OLD bits, |
162 | * respectively, are set in flags. | |
163 | */ | |
164 | struct ref_update *ref_transaction_add_update( | |
165 | struct ref_transaction *transaction, | |
166 | const char *refname, unsigned int flags, | |
89f3bbdd | 167 | const struct object_id *new_oid, |
168 | const struct object_id *old_oid, | |
71564516 MH |
169 | const char *msg); |
170 | ||
4cb77009 MH |
171 | /* |
172 | * Transaction states. | |
30173b88 MH |
173 | * |
174 | * OPEN: The transaction is initialized and new updates can still be | |
175 | * added to it. An OPEN transaction can be prepared, | |
176 | * committed, freed, or aborted (freeing and aborting an open | |
177 | * transaction are equivalent). | |
178 | * | |
179 | * PREPARED: ref_transaction_prepare(), which locks all of the | |
180 | * references involved in the update and checks that the | |
181 | * update has no errors, has been called successfully for the | |
182 | * transaction. A PREPARED transaction can be committed or | |
183 | * aborted. | |
184 | * | |
185 | * CLOSED: The transaction is no longer active. A transaction becomes | |
186 | * CLOSED if there is a failure while building the transaction | |
187 | * or if a transaction is committed or aborted. A CLOSED | |
188 | * transaction can only be freed. | |
4cb77009 MH |
189 | */ |
190 | enum ref_transaction_state { | |
30173b88 MH |
191 | REF_TRANSACTION_OPEN = 0, |
192 | REF_TRANSACTION_PREPARED = 1, | |
193 | REF_TRANSACTION_CLOSED = 2 | |
4cb77009 MH |
194 | }; |
195 | ||
196 | /* | |
197 | * Data structure for holding a reference transaction, which can | |
198 | * consist of checks and updates to multiple references, carried out | |
199 | * as atomically as possible. This structure is opaque to callers. | |
200 | */ | |
201 | struct ref_transaction { | |
c0fe4e8b | 202 | struct ref_store *ref_store; |
4cb77009 MH |
203 | struct ref_update **updates; |
204 | size_t alloc; | |
205 | size_t nr; | |
206 | enum ref_transaction_state state; | |
3bf4f561 | 207 | void *backend_data; |
4cb77009 MH |
208 | }; |
209 | ||
0845122c DT |
210 | /* |
211 | * Check for entries in extras that are within the specified | |
212 | * directory, where dirname is a reference directory name including | |
213 | * the trailing slash (e.g., "refs/heads/foo/"). Ignore any | |
214 | * conflicting references that are found in skip. If there is a | |
215 | * conflicting reference, return its name. | |
216 | * | |
217 | * extras and skip must be sorted lists of reference names. Either one | |
218 | * can be NULL, signifying the empty list. | |
219 | */ | |
220 | const char *find_descendant_ref(const char *dirname, | |
221 | const struct string_list *extras, | |
222 | const struct string_list *skip); | |
223 | ||
ff3a299c DT |
224 | /* |
225 | * Check whether an attempt to rename old_refname to new_refname would | |
226 | * cause a D/F conflict with any existing reference (other than | |
227 | * possibly old_refname). If there would be a conflict, emit an error | |
228 | * message and return false; otherwise, return true. | |
229 | * | |
230 | * Note that this function is not safe against all races with other | |
231 | * processes (though rename_ref() catches some races that might get by | |
232 | * this check). | |
233 | */ | |
7d2df051 NTND |
234 | int refs_rename_ref_available(struct ref_store *refs, |
235 | const char *old_refname, | |
236 | const char *new_refname); | |
0845122c | 237 | |
2d0663b2 DT |
238 | /* We allow "recursive" symbolic refs. Only within reason, though */ |
239 | #define SYMREF_MAXDEPTH 5 | |
93770590 DT |
240 | |
241 | /* Include broken references in a do_for_each_ref*() iteration: */ | |
242 | #define DO_FOR_EACH_INCLUDE_BROKEN 0x01 | |
243 | ||
3bc581b9 MH |
244 | /* |
245 | * Reference iterators | |
246 | * | |
247 | * A reference iterator encapsulates the state of an in-progress | |
248 | * iteration over references. Create an instance of `struct | |
249 | * ref_iterator` via one of the functions in this module. | |
250 | * | |
251 | * A freshly-created ref_iterator doesn't yet point at a reference. To | |
252 | * advance the iterator, call ref_iterator_advance(). If successful, | |
253 | * this sets the iterator's refname, oid, and flags fields to describe | |
254 | * the next reference and returns ITER_OK. The data pointed at by | |
255 | * refname and oid belong to the iterator; if you want to retain them | |
256 | * after calling ref_iterator_advance() again or calling | |
257 | * ref_iterator_abort(), you must make a copy. When the iteration has | |
258 | * been exhausted, ref_iterator_advance() releases any resources | |
15beaaa3 | 259 | * associated with the iteration, frees the ref_iterator object, and |
3bc581b9 MH |
260 | * returns ITER_DONE. If you want to abort the iteration early, call |
261 | * ref_iterator_abort(), which also frees the ref_iterator object and | |
262 | * any associated resources. If there was an internal error advancing | |
263 | * to the next entry, ref_iterator_advance() aborts the iteration, | |
264 | * frees the ref_iterator, and returns ITER_ERROR. | |
265 | * | |
266 | * The reference currently being looked at can be peeled by calling | |
267 | * ref_iterator_peel(). This function is often faster than peel_ref(), | |
268 | * so it should be preferred when iterating over references. | |
269 | * | |
270 | * Putting it all together, a typical iteration looks like this: | |
271 | * | |
272 | * int ok; | |
273 | * struct ref_iterator *iter = ...; | |
274 | * | |
275 | * while ((ok = ref_iterator_advance(iter)) == ITER_OK) { | |
276 | * if (want_to_stop_iteration()) { | |
277 | * ok = ref_iterator_abort(iter); | |
278 | * break; | |
279 | * } | |
280 | * | |
281 | * // Access information about the current reference: | |
282 | * if (!(iter->flags & REF_ISSYMREF)) | |
7b6057c8 | 283 | * printf("%s is %s\n", iter->refname, oid_to_hex(iter->oid)); |
3bc581b9 MH |
284 | * |
285 | * // If you need to peel the reference: | |
286 | * ref_iterator_peel(iter, &oid); | |
287 | * } | |
288 | * | |
289 | * if (ok != ITER_DONE) | |
290 | * handle_error(); | |
291 | */ | |
292 | struct ref_iterator { | |
293 | struct ref_iterator_vtable *vtable; | |
8738a8a4 MH |
294 | |
295 | /* | |
296 | * Does this `ref_iterator` iterate over references in order | |
297 | * by refname? | |
298 | */ | |
299 | unsigned int ordered : 1; | |
300 | ||
3bc581b9 MH |
301 | const char *refname; |
302 | const struct object_id *oid; | |
303 | unsigned int flags; | |
304 | }; | |
305 | ||
306 | /* | |
307 | * Advance the iterator to the first or next item and return ITER_OK. | |
308 | * If the iteration is exhausted, free the resources associated with | |
309 | * the ref_iterator and return ITER_DONE. On errors, free the iterator | |
310 | * resources and return ITER_ERROR. It is a bug to use ref_iterator or | |
311 | * call this function again after it has returned ITER_DONE or | |
312 | * ITER_ERROR. | |
313 | */ | |
314 | int ref_iterator_advance(struct ref_iterator *ref_iterator); | |
315 | ||
316 | /* | |
317 | * If possible, peel the reference currently being viewed by the | |
318 | * iterator. Return 0 on success. | |
319 | */ | |
320 | int ref_iterator_peel(struct ref_iterator *ref_iterator, | |
321 | struct object_id *peeled); | |
322 | ||
323 | /* | |
324 | * End the iteration before it has been exhausted, freeing the | |
325 | * reference iterator and any associated resources and returning | |
326 | * ITER_DONE. If the abort itself failed, return ITER_ERROR. | |
327 | */ | |
328 | int ref_iterator_abort(struct ref_iterator *ref_iterator); | |
329 | ||
330 | /* | |
331 | * An iterator over nothing (its first ref_iterator_advance() call | |
332 | * returns ITER_DONE). | |
333 | */ | |
334 | struct ref_iterator *empty_ref_iterator_begin(void); | |
335 | ||
336 | /* | |
337 | * Return true iff ref_iterator is an empty_ref_iterator. | |
338 | */ | |
339 | int is_empty_ref_iterator(struct ref_iterator *ref_iterator); | |
340 | ||
e121b9cb MH |
341 | /* |
342 | * Return an iterator that goes over each reference in `refs` for | |
343 | * which the refname begins with prefix. If trim is non-zero, then | |
84ee4ca1 HWN |
344 | * trim that many characters off the beginning of each refname. |
345 | * The output is ordered by refname. The following flags are supported: | |
346 | * | |
347 | * DO_FOR_EACH_INCLUDE_BROKEN: include broken references in | |
348 | * the iteration. | |
349 | * | |
350 | * DO_FOR_EACH_PER_WORKTREE_ONLY: only produce REF_TYPE_PER_WORKTREE refs. | |
e121b9cb MH |
351 | */ |
352 | struct ref_iterator *refs_ref_iterator_begin( | |
353 | struct ref_store *refs, | |
354 | const char *prefix, int trim, int flags); | |
355 | ||
3bc581b9 MH |
356 | /* |
357 | * A callback function used to instruct merge_ref_iterator how to | |
358 | * interleave the entries from iter0 and iter1. The function should | |
359 | * return one of the constants defined in enum iterator_selection. It | |
360 | * must not advance either of the iterators itself. | |
361 | * | |
362 | * The function must be prepared to handle the case that iter0 and/or | |
363 | * iter1 is NULL, which indicates that the corresponding sub-iterator | |
364 | * has been exhausted. Its return value must be consistent with the | |
365 | * current states of the iterators; e.g., it must not return | |
366 | * ITER_SKIP_1 if iter1 has already been exhausted. | |
367 | */ | |
368 | typedef enum iterator_selection ref_iterator_select_fn( | |
369 | struct ref_iterator *iter0, struct ref_iterator *iter1, | |
370 | void *cb_data); | |
371 | ||
372 | /* | |
373 | * Iterate over the entries from iter0 and iter1, with the values | |
374 | * interleaved as directed by the select function. The iterator takes | |
375 | * ownership of iter0 and iter1 and frees them when the iteration is | |
8738a8a4 MH |
376 | * over. A derived class should set `ordered` to 1 or 0 based on |
377 | * whether it generates its output in order by reference name. | |
3bc581b9 MH |
378 | */ |
379 | struct ref_iterator *merge_ref_iterator_begin( | |
8738a8a4 | 380 | int ordered, |
3bc581b9 MH |
381 | struct ref_iterator *iter0, struct ref_iterator *iter1, |
382 | ref_iterator_select_fn *select, void *cb_data); | |
383 | ||
384 | /* | |
385 | * An iterator consisting of the union of the entries from front and | |
386 | * back. If there are entries common to the two sub-iterators, use the | |
387 | * one from front. Each iterator must iterate over its entries in | |
388 | * strcmp() order by refname for this to work. | |
389 | * | |
390 | * The new iterator takes ownership of its arguments and frees them | |
391 | * when the iteration is over. As a convenience to callers, if front | |
392 | * or back is an empty_ref_iterator, then abort that one immediately | |
393 | * and return the other iterator directly, without wrapping it. | |
394 | */ | |
395 | struct ref_iterator *overlay_ref_iterator_begin( | |
396 | struct ref_iterator *front, struct ref_iterator *back); | |
397 | ||
398 | /* | |
399 | * Wrap iter0, only letting through the references whose names start | |
400 | * with prefix. If trim is set, set iter->refname to the name of the | |
401 | * reference with that many characters trimmed off the front; | |
402 | * otherwise set it to the full refname. The new iterator takes over | |
403 | * ownership of iter0 and frees it when iteration is over. It makes | |
404 | * its own copy of prefix. | |
405 | * | |
406 | * As an convenience to callers, if prefix is the empty string and | |
407 | * trim is zero, this function returns iter0 directly, without | |
408 | * wrapping it. | |
8738a8a4 MH |
409 | * |
410 | * The resulting ref_iterator is ordered if iter0 is. | |
3bc581b9 MH |
411 | */ |
412 | struct ref_iterator *prefix_ref_iterator_begin(struct ref_iterator *iter0, | |
413 | const char *prefix, | |
414 | int trim); | |
415 | ||
3bc581b9 MH |
416 | /* Internal implementation of reference iteration: */ |
417 | ||
418 | /* | |
419 | * Base class constructor for ref_iterators. Initialize the | |
420 | * ref_iterator part of iter, setting its vtable pointer as specified. | |
8738a8a4 MH |
421 | * `ordered` should be set to 1 if the iterator will iterate over |
422 | * references in order by refname; otherwise it should be set to 0. | |
3bc581b9 MH |
423 | * This is meant to be called only by the initializers of derived |
424 | * classes. | |
425 | */ | |
426 | void base_ref_iterator_init(struct ref_iterator *iter, | |
8738a8a4 MH |
427 | struct ref_iterator_vtable *vtable, |
428 | int ordered); | |
3bc581b9 MH |
429 | |
430 | /* | |
431 | * Base class destructor for ref_iterators. Destroy the ref_iterator | |
432 | * part of iter and shallow-free the object. This is meant to be | |
433 | * called only by the destructors of derived classes. | |
434 | */ | |
435 | void base_ref_iterator_free(struct ref_iterator *iter); | |
436 | ||
437 | /* Virtual function declarations for ref_iterators: */ | |
438 | ||
84ee4ca1 HWN |
439 | /* |
440 | * backend-specific implementation of ref_iterator_advance. For symrefs, the | |
441 | * function should set REF_ISSYMREF, and it should also dereference the symref | |
442 | * to provide the OID referent. If DO_FOR_EACH_INCLUDE_BROKEN is set, symrefs | |
443 | * with non-existent referents and refs pointing to non-existent object names | |
444 | * should also be returned. If DO_FOR_EACH_PER_WORKTREE_ONLY, only | |
445 | * REF_TYPE_PER_WORKTREE refs should be returned. | |
446 | */ | |
3bc581b9 MH |
447 | typedef int ref_iterator_advance_fn(struct ref_iterator *ref_iterator); |
448 | ||
449 | typedef int ref_iterator_peel_fn(struct ref_iterator *ref_iterator, | |
450 | struct object_id *peeled); | |
451 | ||
452 | /* | |
453 | * Implementations of this function should free any resources specific | |
454 | * to the derived class, then call base_ref_iterator_free() to clean | |
455 | * up and free the ref_iterator object. | |
456 | */ | |
457 | typedef int ref_iterator_abort_fn(struct ref_iterator *ref_iterator); | |
458 | ||
459 | struct ref_iterator_vtable { | |
460 | ref_iterator_advance_fn *advance; | |
461 | ref_iterator_peel_fn *peel; | |
462 | ref_iterator_abort_fn *abort; | |
463 | }; | |
464 | ||
93770590 | 465 | /* |
4c4de895 MH |
466 | * current_ref_iter is a performance hack: when iterating over |
467 | * references using the for_each_ref*() functions, current_ref_iter is | |
468 | * set to the reference iterator before calling the callback function. | |
469 | * If the callback function calls peel_ref(), then peel_ref() first | |
470 | * checks whether the reference to be peeled is the one referred to by | |
471 | * the iterator (it usually is) and if so, asks the iterator for the | |
472 | * peeled version of the reference if it is available. This avoids a | |
473 | * refname lookup in a common case. current_ref_iter is set to NULL | |
474 | * when the iteration is over. | |
475 | */ | |
476 | extern struct ref_iterator *current_ref_iter; | |
477 | ||
478 | /* | |
479 | * The common backend for the for_each_*ref* functions. Call fn for | |
480 | * each reference in iter. If the iterator itself ever returns | |
481 | * ITER_ERROR, return -1. If fn ever returns a non-zero value, stop | |
482 | * the iteration and return that value. Otherwise, return 0. In any | |
483 | * case, free the iterator when done. This function is basically an | |
484 | * adapter between the callback style of reference iteration and the | |
485 | * iterator style. | |
486 | */ | |
4a6067cd SB |
487 | int do_for_each_repo_ref_iterator(struct repository *r, |
488 | struct ref_iterator *iter, | |
489 | each_repo_ref_fn fn, void *cb_data); | |
2d0663b2 | 490 | |
0c09ec07 DT |
491 | /* |
492 | * Only include per-worktree refs in a do_for_each_ref*() iteration. | |
493 | * Normally this will be used with a files ref_store, since that's | |
494 | * where all reference backends will presumably store their | |
495 | * per-worktree refs. | |
496 | */ | |
497 | #define DO_FOR_EACH_PER_WORKTREE_ONLY 0x02 | |
e1e33b72 | 498 | |
1a769003 MH |
499 | struct ref_store; |
500 | ||
0c09ec07 DT |
501 | /* refs backends */ |
502 | ||
9e7ec634 NTND |
503 | /* ref_store_init flags */ |
504 | #define REF_STORE_READ (1 << 0) | |
505 | #define REF_STORE_WRITE (1 << 1) /* can perform update operations */ | |
506 | #define REF_STORE_ODB (1 << 2) /* has access to object database */ | |
507 | #define REF_STORE_MAIN (1 << 3) | |
0d8a814d NTND |
508 | #define REF_STORE_ALL_CAPS (REF_STORE_READ | \ |
509 | REF_STORE_WRITE | \ | |
510 | REF_STORE_ODB | \ | |
511 | REF_STORE_MAIN) | |
9e7ec634 | 512 | |
e1e33b72 | 513 | /* |
5d0bc90e NTND |
514 | * Initialize the ref_store for the specified gitdir. These functions |
515 | * should call base_ref_store_init() to initialize the shared part of | |
516 | * the ref_store and to record the ref_store for later lookup. | |
e1e33b72 | 517 | */ |
9e7ec634 NTND |
518 | typedef struct ref_store *ref_store_init_fn(const char *gitdir, |
519 | unsigned int flags); | |
e1e33b72 | 520 | |
6fb5acfd DT |
521 | typedef int ref_init_db_fn(struct ref_store *refs, struct strbuf *err); |
522 | ||
30173b88 MH |
523 | typedef int ref_transaction_prepare_fn(struct ref_store *refs, |
524 | struct ref_transaction *transaction, | |
525 | struct strbuf *err); | |
526 | ||
527 | typedef int ref_transaction_finish_fn(struct ref_store *refs, | |
528 | struct ref_transaction *transaction, | |
529 | struct strbuf *err); | |
530 | ||
531 | typedef int ref_transaction_abort_fn(struct ref_store *refs, | |
532 | struct ref_transaction *transaction, | |
533 | struct strbuf *err); | |
534 | ||
e1e33b72 MH |
535 | typedef int ref_transaction_commit_fn(struct ref_store *refs, |
536 | struct ref_transaction *transaction, | |
537 | struct strbuf *err); | |
538 | ||
8231527e | 539 | typedef int pack_refs_fn(struct ref_store *ref_store, unsigned int flags); |
284689ba MH |
540 | typedef int create_symref_fn(struct ref_store *ref_store, |
541 | const char *ref_target, | |
542 | const char *refs_heads_master, | |
543 | const char *logmsg); | |
64da4199 | 544 | typedef int delete_refs_fn(struct ref_store *ref_store, const char *msg, |
a27dcf89 | 545 | struct string_list *refnames, unsigned int flags); |
9b6b40d9 DT |
546 | typedef int rename_ref_fn(struct ref_store *ref_store, |
547 | const char *oldref, const char *newref, | |
548 | const char *logmsg); | |
52d59cc6 SD |
549 | typedef int copy_ref_fn(struct ref_store *ref_store, |
550 | const char *oldref, const char *newref, | |
551 | const char *logmsg); | |
8231527e | 552 | |
1a769003 | 553 | /* |
e1860571 MH |
554 | * Iterate over the references in `ref_store` whose names start with |
555 | * `prefix`. `prefix` is matched as a literal string, without regard | |
556 | * for path separators. If prefix is NULL or the empty string, iterate | |
8738a8a4 MH |
557 | * over all references in `ref_store`. The output is ordered by |
558 | * refname. | |
1a769003 MH |
559 | */ |
560 | typedef struct ref_iterator *ref_iterator_begin_fn( | |
561 | struct ref_store *ref_store, | |
562 | const char *prefix, unsigned int flags); | |
563 | ||
e3688bd6 DT |
564 | /* reflog functions */ |
565 | ||
566 | /* | |
567 | * Iterate over the references in the specified ref_store that have a | |
568 | * reflog. The refs are iterated over in arbitrary order. | |
569 | */ | |
570 | typedef struct ref_iterator *reflog_iterator_begin_fn( | |
571 | struct ref_store *ref_store); | |
572 | ||
573 | typedef int for_each_reflog_ent_fn(struct ref_store *ref_store, | |
574 | const char *refname, | |
575 | each_reflog_ent_fn fn, | |
576 | void *cb_data); | |
577 | typedef int for_each_reflog_ent_reverse_fn(struct ref_store *ref_store, | |
578 | const char *refname, | |
579 | each_reflog_ent_fn fn, | |
580 | void *cb_data); | |
581 | typedef int reflog_exists_fn(struct ref_store *ref_store, const char *refname); | |
582 | typedef int create_reflog_fn(struct ref_store *ref_store, const char *refname, | |
583 | int force_create, struct strbuf *err); | |
584 | typedef int delete_reflog_fn(struct ref_store *ref_store, const char *refname); | |
585 | typedef int reflog_expire_fn(struct ref_store *ref_store, | |
0155f710 | 586 | const char *refname, const struct object_id *oid, |
e3688bd6 DT |
587 | unsigned int flags, |
588 | reflog_expiry_prepare_fn prepare_fn, | |
589 | reflog_expiry_should_prune_fn should_prune_fn, | |
590 | reflog_expiry_cleanup_fn cleanup_fn, | |
591 | void *policy_cb_data); | |
592 | ||
cf596442 | 593 | /* |
34c7ad8f MH |
594 | * Read a reference from the specified reference store, non-recursively. |
595 | * Set type to describe the reference, and: | |
cf596442 | 596 | * |
99afe91a | 597 | * - If refname is the name of a normal reference, fill in oid |
cf596442 MH |
598 | * (leaving referent unchanged). |
599 | * | |
600 | * - If refname is the name of a symbolic reference, write the full | |
601 | * name of the reference to which it refers (e.g. | |
602 | * "refs/heads/master") to referent and set the REF_ISSYMREF bit in | |
99afe91a | 603 | * type (leaving oid unchanged). The caller is responsible for |
cf596442 MH |
604 | * validating that referent is a valid reference name. |
605 | * | |
606 | * WARNING: refname might be used as part of a filename, so it is | |
607 | * important from a security standpoint that it be safe in the sense | |
608 | * of refname_is_safe(). Moreover, for symrefs this function sets | |
609 | * referent to whatever the repository says, which might not be a | |
610 | * properly-formatted or even safe reference name. NEITHER INPUT NOR | |
611 | * OUTPUT REFERENCE NAMES ARE VALIDATED WITHIN THIS FUNCTION. | |
612 | * | |
613 | * Return 0 on success. If the ref doesn't exist, set errno to ENOENT | |
614 | * and return -1. If the ref exists but is neither a symbolic ref nor | |
99afe91a | 615 | * an object ID, it is broken; set REF_ISBROKEN in type, set errno to |
cf596442 MH |
616 | * EINVAL, and return -1. If there is another error reading the ref, |
617 | * set errno appropriately and return -1. | |
618 | * | |
619 | * Backend-specific flags might be set in type as well, regardless of | |
620 | * outcome. | |
621 | * | |
622 | * It is OK for refname to point into referent. If so: | |
623 | * | |
624 | * - if the function succeeds with REF_ISSYMREF, referent will be | |
625 | * overwritten and the memory formerly pointed to by it might be | |
626 | * changed or even freed. | |
627 | * | |
628 | * - in all other cases, referent will be untouched, and therefore | |
629 | * refname will still be valid and unchanged. | |
630 | */ | |
e1e33b72 | 631 | typedef int read_raw_ref_fn(struct ref_store *ref_store, |
99afe91a | 632 | const char *refname, struct object_id *oid, |
e1e33b72 | 633 | struct strbuf *referent, unsigned int *type); |
127b42a1 | 634 | |
3dce444f RS |
635 | struct ref_storage_be { |
636 | struct ref_storage_be *next; | |
637 | const char *name; | |
00eebe35 | 638 | ref_store_init_fn *init; |
6fb5acfd | 639 | ref_init_db_fn *init_db; |
30173b88 MH |
640 | |
641 | ref_transaction_prepare_fn *transaction_prepare; | |
642 | ref_transaction_finish_fn *transaction_finish; | |
643 | ref_transaction_abort_fn *transaction_abort; | |
fc681463 | 644 | ref_transaction_commit_fn *initial_transaction_commit; |
e1e33b72 | 645 | |
8231527e | 646 | pack_refs_fn *pack_refs; |
284689ba | 647 | create_symref_fn *create_symref; |
a27dcf89 | 648 | delete_refs_fn *delete_refs; |
9b6b40d9 | 649 | rename_ref_fn *rename_ref; |
52d59cc6 | 650 | copy_ref_fn *copy_ref; |
8231527e | 651 | |
1a769003 | 652 | ref_iterator_begin_fn *iterator_begin; |
e1e33b72 | 653 | read_raw_ref_fn *read_raw_ref; |
e3688bd6 DT |
654 | |
655 | reflog_iterator_begin_fn *reflog_iterator_begin; | |
656 | for_each_reflog_ent_fn *for_each_reflog_ent; | |
657 | for_each_reflog_ent_reverse_fn *for_each_reflog_ent_reverse; | |
658 | reflog_exists_fn *reflog_exists; | |
659 | create_reflog_fn *create_reflog; | |
660 | delete_reflog_fn *delete_reflog; | |
661 | reflog_expire_fn *reflog_expire; | |
3dce444f RS |
662 | }; |
663 | ||
664 | extern struct ref_storage_be refs_be_files; | |
e0cc8ac8 | 665 | extern struct ref_storage_be refs_be_packed; |
3dce444f | 666 | |
00eebe35 MH |
667 | /* |
668 | * A representation of the reference store for the main repository or | |
669 | * a submodule. The ref_store instances for submodules are kept in a | |
4877c6c7 | 670 | * hash map; see get_submodule_ref_store() for more info. |
00eebe35 MH |
671 | */ |
672 | struct ref_store { | |
673 | /* The backend describing this ref_store's storage scheme: */ | |
674 | const struct ref_storage_be *be; | |
5085aef4 HWN |
675 | |
676 | /* The gitdir that this ref_store applies to: */ | |
677 | char *gitdir; | |
00eebe35 MH |
678 | }; |
679 | ||
e39620f0 HWN |
680 | /* |
681 | * Parse contents of a loose ref file. | |
682 | */ | |
683 | int parse_loose_ref_contents(const char *buf, struct object_id *oid, | |
684 | struct strbuf *referent, unsigned int *type); | |
685 | ||
00eebe35 | 686 | /* |
fbfd0a29 MH |
687 | * Fill in the generic part of refs and add it to our collection of |
688 | * reference stores. | |
00eebe35 MH |
689 | */ |
690 | void base_ref_store_init(struct ref_store *refs, | |
fbfd0a29 | 691 | const struct ref_storage_be *be); |
00eebe35 | 692 | |
4cb77009 | 693 | #endif /* REFS_REFS_INTERNAL_H */ |