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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 | |
63c05673 HWN |
34 | /* |
35 | * Used as a flag in ref_update::flags when we want to log a ref | |
36 | * update but not actually perform it. This is used when a symbolic | |
37 | * ref update is split up. | |
38 | */ | |
39 | #define REF_LOG_ONLY (1 << 7) | |
40 | ||
4ff0f01c MH |
41 | /* |
42 | * Return the length of time to retry acquiring a loose reference lock | |
43 | * before giving up, in milliseconds: | |
44 | */ | |
45 | long get_files_ref_lock_timeout_ms(void); | |
46 | ||
4cb77009 MH |
47 | /* |
48 | * Return true iff refname is minimally safe. "Safe" here means that | |
49 | * deleting a loose reference by this name will not do any damage, for | |
50 | * example by causing a file that is not a reference to be deleted. | |
51 | * This function does not check that the reference name is legal; for | |
52 | * that, use check_refname_format(). | |
53 | * | |
15ee2c72 MH |
54 | * A refname that starts with "refs/" is considered safe iff it |
55 | * doesn't contain any "." or ".." components or consecutive '/' | |
56 | * characters, end with '/', or (on Windows) contain any '\' | |
57 | * characters. Names that do not start with "refs/" are considered | |
58 | * safe iff they consist entirely of upper case characters and '_' | |
59 | * (like "HEAD" and "MERGE_HEAD" but not "config" or "FOO/BAR"). | |
4cb77009 MH |
60 | */ |
61 | int refname_is_safe(const char *refname); | |
62 | ||
67be7c5a MH |
63 | /* |
64 | * Helper function: return true if refname, which has the specified | |
65 | * oid and flags, can be resolved to an object in the database. If the | |
66 | * referred-to object does not exist, emit a warning and return false. | |
67 | */ | |
68 | int ref_resolves_to_object(const char *refname, | |
69 | const struct object_id *oid, | |
70 | unsigned int flags); | |
71 | ||
4cb77009 MH |
72 | enum peel_status { |
73 | /* object was peeled successfully: */ | |
74 | PEEL_PEELED = 0, | |
75 | ||
76 | /* | |
77 | * object cannot be peeled because the named object (or an | |
78 | * object referred to by a tag in the peel chain), does not | |
79 | * exist. | |
80 | */ | |
81 | PEEL_INVALID = -1, | |
82 | ||
83 | /* object cannot be peeled because it is not a tag: */ | |
84 | PEEL_NON_TAG = -2, | |
85 | ||
86 | /* ref_entry contains no peeled value because it is a symref: */ | |
87 | PEEL_IS_SYMREF = -3, | |
88 | ||
89 | /* | |
90 | * ref_entry cannot be peeled because it is broken (i.e., the | |
91 | * symbolic reference cannot even be resolved to an object | |
92 | * name): | |
93 | */ | |
94 | PEEL_BROKEN = -4 | |
95 | }; | |
96 | ||
97 | /* | |
98 | * Peel the named object; i.e., if the object is a tag, resolve the | |
99 | * tag recursively until a non-tag is found. If successful, store the | |
ac2ed0d7 | 100 | * result to oid and return PEEL_PEELED. If the object is not a tag |
4cb77009 | 101 | * or is not valid, return PEEL_NON_TAG or PEEL_INVALID, respectively, |
78fb4579 | 102 | * and leave oid unchanged. |
4cb77009 | 103 | */ |
ac2ed0d7 | 104 | enum peel_status peel_object(const struct object_id *name, struct object_id *oid); |
4cb77009 | 105 | |
4cb77009 | 106 | /** |
78fb4579 MH |
107 | * Information needed for a single ref update. Set new_oid to the new |
108 | * value or to null_oid to delete the ref. To check the old value | |
109 | * while the ref is locked, set (flags & REF_HAVE_OLD) and set old_oid | |
110 | * to the old value, or to null_oid to ensure the ref does not exist | |
111 | * before update. | |
4cb77009 MH |
112 | */ |
113 | struct ref_update { | |
114 | /* | |
5ac95fee MH |
115 | * If (flags & REF_HAVE_NEW), set the reference to this value |
116 | * (or delete it, if `new_oid` is `null_oid`). | |
4cb77009 | 117 | */ |
98491298 | 118 | struct object_id new_oid; |
6e30b2f6 | 119 | |
4cb77009 MH |
120 | /* |
121 | * If (flags & REF_HAVE_OLD), check that the reference | |
5ac95fee MH |
122 | * previously had this value (or didn't previously exist, if |
123 | * `old_oid` is `null_oid`). | |
4cb77009 | 124 | */ |
98491298 | 125 | struct object_id old_oid; |
6e30b2f6 | 126 | |
4cb77009 | 127 | /* |
91774afc | 128 | * One or more of REF_NO_DEREF, REF_FORCE_CREATE_REFLOG, |
5ac95fee | 129 | * REF_HAVE_NEW, REF_HAVE_OLD, or backend-specific flags. |
4cb77009 MH |
130 | */ |
131 | unsigned int flags; | |
6e30b2f6 | 132 | |
7d618264 | 133 | void *backend_data; |
92b1551b | 134 | unsigned int type; |
4cb77009 | 135 | char *msg; |
6e30b2f6 MH |
136 | |
137 | /* | |
138 | * If this ref_update was split off of a symref update via | |
139 | * split_symref_update(), then this member points at that | |
140 | * update. This is used for two purposes: | |
141 | * 1. When reporting errors, we report the refname under which | |
142 | * the update was originally requested. | |
143 | * 2. When we read the old value of this reference, we | |
144 | * propagate it back to its parent update for recording in | |
145 | * the latter's reflog. | |
146 | */ | |
147 | struct ref_update *parent_update; | |
148 | ||
4cb77009 MH |
149 | const char refname[FLEX_ARRAY]; |
150 | }; | |
151 | ||
8b72fea7 HWN |
152 | int refs_read_raw_ref(struct ref_store *ref_store, const char *refname, |
153 | struct object_id *oid, struct strbuf *referent, | |
154 | unsigned int *type, int *failure_errno); | |
470be518 | 155 | |
2ced105c MH |
156 | /* |
157 | * Write an error to `err` and return a nonzero value iff the same | |
158 | * refname appears multiple times in `refnames`. `refnames` must be | |
159 | * sorted on entry to this function. | |
160 | */ | |
161 | int ref_update_reject_duplicates(struct string_list *refnames, | |
162 | struct strbuf *err); | |
163 | ||
71564516 MH |
164 | /* |
165 | * Add a ref_update with the specified properties to transaction, and | |
166 | * return a pointer to the new object. This function does not verify | |
78fb4579 | 167 | * that refname is well-formed. new_oid and old_oid are only |
71564516 MH |
168 | * dereferenced if the REF_HAVE_NEW and REF_HAVE_OLD bits, |
169 | * respectively, are set in flags. | |
170 | */ | |
171 | struct ref_update *ref_transaction_add_update( | |
172 | struct ref_transaction *transaction, | |
173 | const char *refname, unsigned int flags, | |
89f3bbdd | 174 | const struct object_id *new_oid, |
175 | const struct object_id *old_oid, | |
71564516 MH |
176 | const char *msg); |
177 | ||
4cb77009 MH |
178 | /* |
179 | * Transaction states. | |
30173b88 MH |
180 | * |
181 | * OPEN: The transaction is initialized and new updates can still be | |
182 | * added to it. An OPEN transaction can be prepared, | |
183 | * committed, freed, or aborted (freeing and aborting an open | |
184 | * transaction are equivalent). | |
185 | * | |
186 | * PREPARED: ref_transaction_prepare(), which locks all of the | |
187 | * references involved in the update and checks that the | |
188 | * update has no errors, has been called successfully for the | |
189 | * transaction. A PREPARED transaction can be committed or | |
190 | * aborted. | |
191 | * | |
192 | * CLOSED: The transaction is no longer active. A transaction becomes | |
193 | * CLOSED if there is a failure while building the transaction | |
194 | * or if a transaction is committed or aborted. A CLOSED | |
195 | * transaction can only be freed. | |
4cb77009 MH |
196 | */ |
197 | enum ref_transaction_state { | |
30173b88 MH |
198 | REF_TRANSACTION_OPEN = 0, |
199 | REF_TRANSACTION_PREPARED = 1, | |
200 | REF_TRANSACTION_CLOSED = 2 | |
4cb77009 MH |
201 | }; |
202 | ||
203 | /* | |
204 | * Data structure for holding a reference transaction, which can | |
205 | * consist of checks and updates to multiple references, carried out | |
206 | * as atomically as possible. This structure is opaque to callers. | |
207 | */ | |
208 | struct ref_transaction { | |
c0fe4e8b | 209 | struct ref_store *ref_store; |
4cb77009 MH |
210 | struct ref_update **updates; |
211 | size_t alloc; | |
212 | size_t nr; | |
213 | enum ref_transaction_state state; | |
3bf4f561 | 214 | void *backend_data; |
4cb77009 MH |
215 | }; |
216 | ||
0845122c DT |
217 | /* |
218 | * Check for entries in extras that are within the specified | |
219 | * directory, where dirname is a reference directory name including | |
220 | * the trailing slash (e.g., "refs/heads/foo/"). Ignore any | |
221 | * conflicting references that are found in skip. If there is a | |
222 | * conflicting reference, return its name. | |
223 | * | |
224 | * extras and skip must be sorted lists of reference names. Either one | |
225 | * can be NULL, signifying the empty list. | |
226 | */ | |
227 | const char *find_descendant_ref(const char *dirname, | |
228 | const struct string_list *extras, | |
229 | const struct string_list *skip); | |
230 | ||
ff3a299c DT |
231 | /* |
232 | * Check whether an attempt to rename old_refname to new_refname would | |
233 | * cause a D/F conflict with any existing reference (other than | |
234 | * possibly old_refname). If there would be a conflict, emit an error | |
235 | * message and return false; otherwise, return true. | |
236 | * | |
237 | * Note that this function is not safe against all races with other | |
238 | * processes (though rename_ref() catches some races that might get by | |
239 | * this check). | |
240 | */ | |
7d2df051 NTND |
241 | int refs_rename_ref_available(struct ref_store *refs, |
242 | const char *old_refname, | |
243 | const char *new_refname); | |
0845122c | 244 | |
2d0663b2 DT |
245 | /* We allow "recursive" symbolic refs. Only within reason, though */ |
246 | #define SYMREF_MAXDEPTH 5 | |
93770590 | 247 | |
bf708add | 248 | /* |
9aab952e JK |
249 | * These flags are passed to refs_ref_iterator_begin() (and do_for_each_ref(), |
250 | * which feeds it). | |
bf708add | 251 | */ |
9aab952e JK |
252 | enum do_for_each_ref_flags { |
253 | /* | |
254 | * Include broken references in a do_for_each_ref*() iteration, which | |
255 | * would normally be omitted. This includes both refs that point to | |
256 | * missing objects (a true repository corruption), ones with illegal | |
257 | * names (which we prefer not to expose to callers), as well as | |
258 | * dangling symbolic refs (i.e., those that point to a non-existent | |
259 | * ref; this is not a corruption, but as they have no valid oid, we | |
260 | * omit them from normal iteration results). | |
261 | */ | |
262 | DO_FOR_EACH_INCLUDE_BROKEN = (1 << 0), | |
263 | ||
264 | /* | |
265 | * Only include per-worktree refs in a do_for_each_ref*() iteration. | |
266 | * Normally this will be used with a files ref_store, since that's | |
267 | * where all reference backends will presumably store their | |
268 | * per-worktree refs. | |
269 | */ | |
270 | DO_FOR_EACH_PER_WORKTREE_ONLY = (1 << 1), | |
8dccb224 JK |
271 | |
272 | /* | |
273 | * Omit dangling symrefs from output; this only has an effect with | |
274 | * INCLUDE_BROKEN, since they are otherwise not included at all. | |
275 | */ | |
276 | DO_FOR_EACH_OMIT_DANGLING_SYMREFS = (1 << 2), | |
9aab952e | 277 | }; |
93770590 | 278 | |
3bc581b9 MH |
279 | /* |
280 | * Reference iterators | |
281 | * | |
282 | * A reference iterator encapsulates the state of an in-progress | |
283 | * iteration over references. Create an instance of `struct | |
284 | * ref_iterator` via one of the functions in this module. | |
285 | * | |
286 | * A freshly-created ref_iterator doesn't yet point at a reference. To | |
287 | * advance the iterator, call ref_iterator_advance(). If successful, | |
288 | * this sets the iterator's refname, oid, and flags fields to describe | |
289 | * the next reference and returns ITER_OK. The data pointed at by | |
290 | * refname and oid belong to the iterator; if you want to retain them | |
291 | * after calling ref_iterator_advance() again or calling | |
292 | * ref_iterator_abort(), you must make a copy. When the iteration has | |
293 | * been exhausted, ref_iterator_advance() releases any resources | |
15beaaa3 | 294 | * associated with the iteration, frees the ref_iterator object, and |
3bc581b9 MH |
295 | * returns ITER_DONE. If you want to abort the iteration early, call |
296 | * ref_iterator_abort(), which also frees the ref_iterator object and | |
297 | * any associated resources. If there was an internal error advancing | |
298 | * to the next entry, ref_iterator_advance() aborts the iteration, | |
299 | * frees the ref_iterator, and returns ITER_ERROR. | |
300 | * | |
301 | * The reference currently being looked at can be peeled by calling | |
302 | * ref_iterator_peel(). This function is often faster than peel_ref(), | |
303 | * so it should be preferred when iterating over references. | |
304 | * | |
305 | * Putting it all together, a typical iteration looks like this: | |
306 | * | |
307 | * int ok; | |
308 | * struct ref_iterator *iter = ...; | |
309 | * | |
310 | * while ((ok = ref_iterator_advance(iter)) == ITER_OK) { | |
311 | * if (want_to_stop_iteration()) { | |
312 | * ok = ref_iterator_abort(iter); | |
313 | * break; | |
314 | * } | |
315 | * | |
316 | * // Access information about the current reference: | |
317 | * if (!(iter->flags & REF_ISSYMREF)) | |
7b6057c8 | 318 | * printf("%s is %s\n", iter->refname, oid_to_hex(iter->oid)); |
3bc581b9 MH |
319 | * |
320 | * // If you need to peel the reference: | |
321 | * ref_iterator_peel(iter, &oid); | |
322 | * } | |
323 | * | |
324 | * if (ok != ITER_DONE) | |
325 | * handle_error(); | |
326 | */ | |
327 | struct ref_iterator { | |
328 | struct ref_iterator_vtable *vtable; | |
8738a8a4 MH |
329 | |
330 | /* | |
331 | * Does this `ref_iterator` iterate over references in order | |
332 | * by refname? | |
333 | */ | |
334 | unsigned int ordered : 1; | |
335 | ||
3bc581b9 MH |
336 | const char *refname; |
337 | const struct object_id *oid; | |
338 | unsigned int flags; | |
339 | }; | |
340 | ||
341 | /* | |
342 | * Advance the iterator to the first or next item and return ITER_OK. | |
343 | * If the iteration is exhausted, free the resources associated with | |
344 | * the ref_iterator and return ITER_DONE. On errors, free the iterator | |
345 | * resources and return ITER_ERROR. It is a bug to use ref_iterator or | |
346 | * call this function again after it has returned ITER_DONE or | |
347 | * ITER_ERROR. | |
348 | */ | |
349 | int ref_iterator_advance(struct ref_iterator *ref_iterator); | |
350 | ||
351 | /* | |
352 | * If possible, peel the reference currently being viewed by the | |
353 | * iterator. Return 0 on success. | |
354 | */ | |
355 | int ref_iterator_peel(struct ref_iterator *ref_iterator, | |
356 | struct object_id *peeled); | |
357 | ||
358 | /* | |
359 | * End the iteration before it has been exhausted, freeing the | |
360 | * reference iterator and any associated resources and returning | |
361 | * ITER_DONE. If the abort itself failed, return ITER_ERROR. | |
362 | */ | |
363 | int ref_iterator_abort(struct ref_iterator *ref_iterator); | |
364 | ||
365 | /* | |
366 | * An iterator over nothing (its first ref_iterator_advance() call | |
367 | * returns ITER_DONE). | |
368 | */ | |
369 | struct ref_iterator *empty_ref_iterator_begin(void); | |
370 | ||
371 | /* | |
372 | * Return true iff ref_iterator is an empty_ref_iterator. | |
373 | */ | |
374 | int is_empty_ref_iterator(struct ref_iterator *ref_iterator); | |
375 | ||
e121b9cb MH |
376 | /* |
377 | * Return an iterator that goes over each reference in `refs` for | |
378 | * which the refname begins with prefix. If trim is non-zero, then | |
84ee4ca1 | 379 | * trim that many characters off the beginning of each refname. |
9aab952e | 380 | * The output is ordered by refname. |
e121b9cb MH |
381 | */ |
382 | struct ref_iterator *refs_ref_iterator_begin( | |
383 | struct ref_store *refs, | |
9aab952e JK |
384 | const char *prefix, int trim, |
385 | enum do_for_each_ref_flags flags); | |
e121b9cb | 386 | |
3bc581b9 MH |
387 | /* |
388 | * A callback function used to instruct merge_ref_iterator how to | |
389 | * interleave the entries from iter0 and iter1. The function should | |
390 | * return one of the constants defined in enum iterator_selection. It | |
391 | * must not advance either of the iterators itself. | |
392 | * | |
393 | * The function must be prepared to handle the case that iter0 and/or | |
394 | * iter1 is NULL, which indicates that the corresponding sub-iterator | |
395 | * has been exhausted. Its return value must be consistent with the | |
396 | * current states of the iterators; e.g., it must not return | |
397 | * ITER_SKIP_1 if iter1 has already been exhausted. | |
398 | */ | |
399 | typedef enum iterator_selection ref_iterator_select_fn( | |
400 | struct ref_iterator *iter0, struct ref_iterator *iter1, | |
401 | void *cb_data); | |
402 | ||
403 | /* | |
404 | * Iterate over the entries from iter0 and iter1, with the values | |
405 | * interleaved as directed by the select function. The iterator takes | |
406 | * ownership of iter0 and iter1 and frees them when the iteration is | |
8738a8a4 MH |
407 | * over. A derived class should set `ordered` to 1 or 0 based on |
408 | * whether it generates its output in order by reference name. | |
3bc581b9 MH |
409 | */ |
410 | struct ref_iterator *merge_ref_iterator_begin( | |
8738a8a4 | 411 | int ordered, |
3bc581b9 MH |
412 | struct ref_iterator *iter0, struct ref_iterator *iter1, |
413 | ref_iterator_select_fn *select, void *cb_data); | |
414 | ||
415 | /* | |
416 | * An iterator consisting of the union of the entries from front and | |
417 | * back. If there are entries common to the two sub-iterators, use the | |
418 | * one from front. Each iterator must iterate over its entries in | |
419 | * strcmp() order by refname for this to work. | |
420 | * | |
421 | * The new iterator takes ownership of its arguments and frees them | |
422 | * when the iteration is over. As a convenience to callers, if front | |
423 | * or back is an empty_ref_iterator, then abort that one immediately | |
424 | * and return the other iterator directly, without wrapping it. | |
425 | */ | |
426 | struct ref_iterator *overlay_ref_iterator_begin( | |
427 | struct ref_iterator *front, struct ref_iterator *back); | |
428 | ||
429 | /* | |
430 | * Wrap iter0, only letting through the references whose names start | |
431 | * with prefix. If trim is set, set iter->refname to the name of the | |
432 | * reference with that many characters trimmed off the front; | |
433 | * otherwise set it to the full refname. The new iterator takes over | |
434 | * ownership of iter0 and frees it when iteration is over. It makes | |
435 | * its own copy of prefix. | |
436 | * | |
437 | * As an convenience to callers, if prefix is the empty string and | |
438 | * trim is zero, this function returns iter0 directly, without | |
439 | * wrapping it. | |
8738a8a4 MH |
440 | * |
441 | * The resulting ref_iterator is ordered if iter0 is. | |
3bc581b9 MH |
442 | */ |
443 | struct ref_iterator *prefix_ref_iterator_begin(struct ref_iterator *iter0, | |
444 | const char *prefix, | |
445 | int trim); | |
446 | ||
3bc581b9 MH |
447 | /* Internal implementation of reference iteration: */ |
448 | ||
449 | /* | |
450 | * Base class constructor for ref_iterators. Initialize the | |
451 | * ref_iterator part of iter, setting its vtable pointer as specified. | |
8738a8a4 MH |
452 | * `ordered` should be set to 1 if the iterator will iterate over |
453 | * references in order by refname; otherwise it should be set to 0. | |
3bc581b9 MH |
454 | * This is meant to be called only by the initializers of derived |
455 | * classes. | |
456 | */ | |
457 | void base_ref_iterator_init(struct ref_iterator *iter, | |
8738a8a4 MH |
458 | struct ref_iterator_vtable *vtable, |
459 | int ordered); | |
3bc581b9 MH |
460 | |
461 | /* | |
462 | * Base class destructor for ref_iterators. Destroy the ref_iterator | |
463 | * part of iter and shallow-free the object. This is meant to be | |
464 | * called only by the destructors of derived classes. | |
465 | */ | |
466 | void base_ref_iterator_free(struct ref_iterator *iter); | |
467 | ||
468 | /* Virtual function declarations for ref_iterators: */ | |
469 | ||
84ee4ca1 HWN |
470 | /* |
471 | * backend-specific implementation of ref_iterator_advance. For symrefs, the | |
472 | * function should set REF_ISSYMREF, and it should also dereference the symref | |
9aab952e JK |
473 | * to provide the OID referent. It should respect do_for_each_ref_flags |
474 | * that were passed to refs_ref_iterator_begin(). | |
84ee4ca1 | 475 | */ |
3bc581b9 MH |
476 | typedef int ref_iterator_advance_fn(struct ref_iterator *ref_iterator); |
477 | ||
617480d7 HWN |
478 | /* |
479 | * Peels the current ref, returning 0 for success or -1 for failure. | |
480 | */ | |
3bc581b9 MH |
481 | typedef int ref_iterator_peel_fn(struct ref_iterator *ref_iterator, |
482 | struct object_id *peeled); | |
483 | ||
484 | /* | |
485 | * Implementations of this function should free any resources specific | |
486 | * to the derived class, then call base_ref_iterator_free() to clean | |
487 | * up and free the ref_iterator object. | |
488 | */ | |
489 | typedef int ref_iterator_abort_fn(struct ref_iterator *ref_iterator); | |
490 | ||
491 | struct ref_iterator_vtable { | |
492 | ref_iterator_advance_fn *advance; | |
493 | ref_iterator_peel_fn *peel; | |
494 | ref_iterator_abort_fn *abort; | |
495 | }; | |
496 | ||
93770590 | 497 | /* |
4c4de895 MH |
498 | * current_ref_iter is a performance hack: when iterating over |
499 | * references using the for_each_ref*() functions, current_ref_iter is | |
500 | * set to the reference iterator before calling the callback function. | |
501 | * If the callback function calls peel_ref(), then peel_ref() first | |
502 | * checks whether the reference to be peeled is the one referred to by | |
503 | * the iterator (it usually is) and if so, asks the iterator for the | |
504 | * peeled version of the reference if it is available. This avoids a | |
505 | * refname lookup in a common case. current_ref_iter is set to NULL | |
506 | * when the iteration is over. | |
507 | */ | |
508 | extern struct ref_iterator *current_ref_iter; | |
509 | ||
510 | /* | |
511 | * The common backend for the for_each_*ref* functions. Call fn for | |
512 | * each reference in iter. If the iterator itself ever returns | |
513 | * ITER_ERROR, return -1. If fn ever returns a non-zero value, stop | |
514 | * the iteration and return that value. Otherwise, return 0. In any | |
515 | * case, free the iterator when done. This function is basically an | |
516 | * adapter between the callback style of reference iteration and the | |
517 | * iterator style. | |
518 | */ | |
4a6067cd SB |
519 | int do_for_each_repo_ref_iterator(struct repository *r, |
520 | struct ref_iterator *iter, | |
521 | each_repo_ref_fn fn, void *cb_data); | |
2d0663b2 | 522 | |
1a769003 MH |
523 | struct ref_store; |
524 | ||
0c09ec07 DT |
525 | /* refs backends */ |
526 | ||
9e7ec634 NTND |
527 | /* ref_store_init flags */ |
528 | #define REF_STORE_READ (1 << 0) | |
529 | #define REF_STORE_WRITE (1 << 1) /* can perform update operations */ | |
530 | #define REF_STORE_ODB (1 << 2) /* has access to object database */ | |
531 | #define REF_STORE_MAIN (1 << 3) | |
0d8a814d NTND |
532 | #define REF_STORE_ALL_CAPS (REF_STORE_READ | \ |
533 | REF_STORE_WRITE | \ | |
534 | REF_STORE_ODB | \ | |
535 | REF_STORE_MAIN) | |
9e7ec634 | 536 | |
e1e33b72 | 537 | /* |
5d0bc90e NTND |
538 | * Initialize the ref_store for the specified gitdir. These functions |
539 | * should call base_ref_store_init() to initialize the shared part of | |
540 | * the ref_store and to record the ref_store for later lookup. | |
e1e33b72 | 541 | */ |
9e7ec634 NTND |
542 | typedef struct ref_store *ref_store_init_fn(const char *gitdir, |
543 | unsigned int flags); | |
e1e33b72 | 544 | |
6fb5acfd DT |
545 | typedef int ref_init_db_fn(struct ref_store *refs, struct strbuf *err); |
546 | ||
30173b88 MH |
547 | typedef int ref_transaction_prepare_fn(struct ref_store *refs, |
548 | struct ref_transaction *transaction, | |
549 | struct strbuf *err); | |
550 | ||
551 | typedef int ref_transaction_finish_fn(struct ref_store *refs, | |
552 | struct ref_transaction *transaction, | |
553 | struct strbuf *err); | |
554 | ||
555 | typedef int ref_transaction_abort_fn(struct ref_store *refs, | |
556 | struct ref_transaction *transaction, | |
557 | struct strbuf *err); | |
558 | ||
e1e33b72 MH |
559 | typedef int ref_transaction_commit_fn(struct ref_store *refs, |
560 | struct ref_transaction *transaction, | |
561 | struct strbuf *err); | |
562 | ||
8231527e | 563 | typedef int pack_refs_fn(struct ref_store *ref_store, unsigned int flags); |
284689ba MH |
564 | typedef int create_symref_fn(struct ref_store *ref_store, |
565 | const char *ref_target, | |
566 | const char *refs_heads_master, | |
567 | const char *logmsg); | |
64da4199 | 568 | typedef int delete_refs_fn(struct ref_store *ref_store, const char *msg, |
a27dcf89 | 569 | struct string_list *refnames, unsigned int flags); |
9b6b40d9 DT |
570 | typedef int rename_ref_fn(struct ref_store *ref_store, |
571 | const char *oldref, const char *newref, | |
572 | const char *logmsg); | |
52d59cc6 SD |
573 | typedef int copy_ref_fn(struct ref_store *ref_store, |
574 | const char *oldref, const char *newref, | |
575 | const char *logmsg); | |
8231527e | 576 | |
1a769003 | 577 | /* |
e1860571 MH |
578 | * Iterate over the references in `ref_store` whose names start with |
579 | * `prefix`. `prefix` is matched as a literal string, without regard | |
580 | * for path separators. If prefix is NULL or the empty string, iterate | |
8738a8a4 MH |
581 | * over all references in `ref_store`. The output is ordered by |
582 | * refname. | |
1a769003 MH |
583 | */ |
584 | typedef struct ref_iterator *ref_iterator_begin_fn( | |
585 | struct ref_store *ref_store, | |
586 | const char *prefix, unsigned int flags); | |
587 | ||
e3688bd6 DT |
588 | /* reflog functions */ |
589 | ||
590 | /* | |
591 | * Iterate over the references in the specified ref_store that have a | |
592 | * reflog. The refs are iterated over in arbitrary order. | |
593 | */ | |
594 | typedef struct ref_iterator *reflog_iterator_begin_fn( | |
595 | struct ref_store *ref_store); | |
596 | ||
597 | typedef int for_each_reflog_ent_fn(struct ref_store *ref_store, | |
598 | const char *refname, | |
599 | each_reflog_ent_fn fn, | |
600 | void *cb_data); | |
601 | typedef int for_each_reflog_ent_reverse_fn(struct ref_store *ref_store, | |
602 | const char *refname, | |
603 | each_reflog_ent_fn fn, | |
604 | void *cb_data); | |
605 | typedef int reflog_exists_fn(struct ref_store *ref_store, const char *refname); | |
606 | typedef int create_reflog_fn(struct ref_store *ref_store, const char *refname, | |
607 | int force_create, struct strbuf *err); | |
608 | typedef int delete_reflog_fn(struct ref_store *ref_store, const char *refname); | |
609 | typedef int reflog_expire_fn(struct ref_store *ref_store, | |
cc40b5ce | 610 | const char *refname, |
e3688bd6 DT |
611 | unsigned int flags, |
612 | reflog_expiry_prepare_fn prepare_fn, | |
613 | reflog_expiry_should_prune_fn should_prune_fn, | |
614 | reflog_expiry_cleanup_fn cleanup_fn, | |
615 | void *policy_cb_data); | |
616 | ||
cf596442 | 617 | /* |
34c7ad8f MH |
618 | * Read a reference from the specified reference store, non-recursively. |
619 | * Set type to describe the reference, and: | |
cf596442 | 620 | * |
99afe91a | 621 | * - If refname is the name of a normal reference, fill in oid |
cf596442 MH |
622 | * (leaving referent unchanged). |
623 | * | |
624 | * - If refname is the name of a symbolic reference, write the full | |
625 | * name of the reference to which it refers (e.g. | |
626 | * "refs/heads/master") to referent and set the REF_ISSYMREF bit in | |
99afe91a | 627 | * type (leaving oid unchanged). The caller is responsible for |
cf596442 MH |
628 | * validating that referent is a valid reference name. |
629 | * | |
630 | * WARNING: refname might be used as part of a filename, so it is | |
631 | * important from a security standpoint that it be safe in the sense | |
632 | * of refname_is_safe(). Moreover, for symrefs this function sets | |
633 | * referent to whatever the repository says, which might not be a | |
634 | * properly-formatted or even safe reference name. NEITHER INPUT NOR | |
635 | * OUTPUT REFERENCE NAMES ARE VALIDATED WITHIN THIS FUNCTION. | |
636 | * | |
5b12e16b HWN |
637 | * Return 0 on success, or -1 on failure. If the ref exists but is neither a |
638 | * symbolic ref nor an object ID, it is broken. In this case set REF_ISBROKEN in | |
639 | * type, and return -1 (failure_errno should not be ENOENT) | |
640 | * | |
641 | * failure_errno provides errno codes that are interpreted beyond error | |
642 | * reporting. The following error codes have special meaning: | |
643 | * * ENOENT: the ref doesn't exist | |
644 | * * EISDIR: ref name is a directory | |
645 | * * ENOTDIR: ref prefix is not a directory | |
cf596442 MH |
646 | * |
647 | * Backend-specific flags might be set in type as well, regardless of | |
648 | * outcome. | |
649 | * | |
650 | * It is OK for refname to point into referent. If so: | |
651 | * | |
652 | * - if the function succeeds with REF_ISSYMREF, referent will be | |
653 | * overwritten and the memory formerly pointed to by it might be | |
654 | * changed or even freed. | |
655 | * | |
656 | * - in all other cases, referent will be untouched, and therefore | |
657 | * refname will still be valid and unchanged. | |
658 | */ | |
5b12e16b HWN |
659 | typedef int read_raw_ref_fn(struct ref_store *ref_store, const char *refname, |
660 | struct object_id *oid, struct strbuf *referent, | |
661 | unsigned int *type, int *failure_errno); | |
127b42a1 | 662 | |
3dce444f RS |
663 | struct ref_storage_be { |
664 | struct ref_storage_be *next; | |
665 | const char *name; | |
00eebe35 | 666 | ref_store_init_fn *init; |
6fb5acfd | 667 | ref_init_db_fn *init_db; |
30173b88 MH |
668 | |
669 | ref_transaction_prepare_fn *transaction_prepare; | |
670 | ref_transaction_finish_fn *transaction_finish; | |
671 | ref_transaction_abort_fn *transaction_abort; | |
fc681463 | 672 | ref_transaction_commit_fn *initial_transaction_commit; |
e1e33b72 | 673 | |
8231527e | 674 | pack_refs_fn *pack_refs; |
284689ba | 675 | create_symref_fn *create_symref; |
a27dcf89 | 676 | delete_refs_fn *delete_refs; |
9b6b40d9 | 677 | rename_ref_fn *rename_ref; |
52d59cc6 | 678 | copy_ref_fn *copy_ref; |
8231527e | 679 | |
1a769003 | 680 | ref_iterator_begin_fn *iterator_begin; |
e1e33b72 | 681 | read_raw_ref_fn *read_raw_ref; |
e3688bd6 DT |
682 | |
683 | reflog_iterator_begin_fn *reflog_iterator_begin; | |
684 | for_each_reflog_ent_fn *for_each_reflog_ent; | |
685 | for_each_reflog_ent_reverse_fn *for_each_reflog_ent_reverse; | |
686 | reflog_exists_fn *reflog_exists; | |
687 | create_reflog_fn *create_reflog; | |
688 | delete_reflog_fn *delete_reflog; | |
689 | reflog_expire_fn *reflog_expire; | |
3dce444f RS |
690 | }; |
691 | ||
692 | extern struct ref_storage_be refs_be_files; | |
e0cc8ac8 | 693 | extern struct ref_storage_be refs_be_packed; |
3dce444f | 694 | |
00eebe35 MH |
695 | /* |
696 | * A representation of the reference store for the main repository or | |
697 | * a submodule. The ref_store instances for submodules are kept in a | |
4877c6c7 | 698 | * hash map; see get_submodule_ref_store() for more info. |
00eebe35 MH |
699 | */ |
700 | struct ref_store { | |
701 | /* The backend describing this ref_store's storage scheme: */ | |
702 | const struct ref_storage_be *be; | |
5085aef4 HWN |
703 | |
704 | /* The gitdir that this ref_store applies to: */ | |
705 | char *gitdir; | |
00eebe35 MH |
706 | }; |
707 | ||
e39620f0 HWN |
708 | /* |
709 | * Parse contents of a loose ref file. | |
710 | */ | |
711 | int parse_loose_ref_contents(const char *buf, struct object_id *oid, | |
712 | struct strbuf *referent, unsigned int *type); | |
713 | ||
00eebe35 | 714 | /* |
fbfd0a29 MH |
715 | * Fill in the generic part of refs and add it to our collection of |
716 | * reference stores. | |
00eebe35 MH |
717 | */ |
718 | void base_ref_store_init(struct ref_store *refs, | |
fbfd0a29 | 719 | const struct ref_storage_be *be); |
00eebe35 | 720 | |
4441f427 HWN |
721 | /* |
722 | * Support GIT_TRACE_REFS by optionally wrapping the given ref_store instance. | |
723 | */ | |
724 | struct ref_store *maybe_debug_wrap_ref_store(const char *gitdir, struct ref_store *store); | |
725 | ||
4cb77009 | 726 | #endif /* REFS_REFS_INTERNAL_H */ |