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1 | #include "cache.h" | |
2 | #include "tag.h" | |
3 | #include "commit.h" | |
4 | #include "commit-graph.h" | |
5 | #include "repository.h" | |
6 | #include "object-store.h" | |
7 | #include "pkt-line.h" | |
8 | #include "utf8.h" | |
9 | #include "diff.h" | |
10 | #include "revision.h" | |
11 | #include "notes.h" | |
12 | #include "alloc.h" | |
13 | #include "gpg-interface.h" | |
14 | #include "mergesort.h" | |
15 | #include "commit-slab.h" | |
16 | #include "prio-queue.h" | |
17 | #include "sha1-lookup.h" | |
18 | #include "wt-status.h" | |
19 | #include "advice.h" | |
20 | #include "refs.h" | |
21 | #include "commit-reach.h" | |
22 | #include "run-command.h" | |
23 | ||
24 | static struct commit_extra_header *read_commit_extra_header_lines(const char *buf, size_t len, const char **); | |
25 | ||
26 | int save_commit_buffer = 1; | |
27 | ||
28 | const char *commit_type = "commit"; | |
29 | ||
30 | struct commit *lookup_commit_reference_gently(struct repository *r, | |
31 | const struct object_id *oid, int quiet) | |
32 | { | |
33 | struct object *obj = deref_tag(r, | |
34 | parse_object(r, oid), | |
35 | NULL, 0); | |
36 | ||
37 | if (!obj) | |
38 | return NULL; | |
39 | return object_as_type(r, obj, OBJ_COMMIT, quiet); | |
40 | } | |
41 | ||
42 | struct commit *lookup_commit_reference(struct repository *r, const struct object_id *oid) | |
43 | { | |
44 | return lookup_commit_reference_gently(r, oid, 0); | |
45 | } | |
46 | ||
47 | struct commit *lookup_commit_or_die(const struct object_id *oid, const char *ref_name) | |
48 | { | |
49 | struct commit *c = lookup_commit_reference(the_repository, oid); | |
50 | if (!c) | |
51 | die(_("could not parse %s"), ref_name); | |
52 | if (!oideq(oid, &c->object.oid)) { | |
53 | warning(_("%s %s is not a commit!"), | |
54 | ref_name, oid_to_hex(oid)); | |
55 | } | |
56 | return c; | |
57 | } | |
58 | ||
59 | struct commit *lookup_commit(struct repository *r, const struct object_id *oid) | |
60 | { | |
61 | struct object *obj = lookup_object(r, oid); | |
62 | if (!obj) | |
63 | return create_object(r, oid, alloc_commit_node(r)); | |
64 | return object_as_type(r, obj, OBJ_COMMIT, 0); | |
65 | } | |
66 | ||
67 | struct commit *lookup_commit_reference_by_name(const char *name) | |
68 | { | |
69 | struct object_id oid; | |
70 | struct commit *commit; | |
71 | ||
72 | if (get_oid_committish(name, &oid)) | |
73 | return NULL; | |
74 | commit = lookup_commit_reference(the_repository, &oid); | |
75 | if (parse_commit(commit)) | |
76 | return NULL; | |
77 | return commit; | |
78 | } | |
79 | ||
80 | static timestamp_t parse_commit_date(const char *buf, const char *tail) | |
81 | { | |
82 | const char *dateptr; | |
83 | ||
84 | if (buf + 6 >= tail) | |
85 | return 0; | |
86 | if (memcmp(buf, "author", 6)) | |
87 | return 0; | |
88 | while (buf < tail && *buf++ != '\n') | |
89 | /* nada */; | |
90 | if (buf + 9 >= tail) | |
91 | return 0; | |
92 | if (memcmp(buf, "committer", 9)) | |
93 | return 0; | |
94 | while (buf < tail && *buf++ != '>') | |
95 | /* nada */; | |
96 | if (buf >= tail) | |
97 | return 0; | |
98 | dateptr = buf; | |
99 | while (buf < tail && *buf++ != '\n') | |
100 | /* nada */; | |
101 | if (buf >= tail) | |
102 | return 0; | |
103 | /* dateptr < buf && buf[-1] == '\n', so parsing will stop at buf-1 */ | |
104 | return parse_timestamp(dateptr, NULL, 10); | |
105 | } | |
106 | ||
107 | static const unsigned char *commit_graft_sha1_access(size_t index, void *table) | |
108 | { | |
109 | struct commit_graft **commit_graft_table = table; | |
110 | return commit_graft_table[index]->oid.hash; | |
111 | } | |
112 | ||
113 | static int commit_graft_pos(struct repository *r, const unsigned char *sha1) | |
114 | { | |
115 | return sha1_pos(sha1, r->parsed_objects->grafts, | |
116 | r->parsed_objects->grafts_nr, | |
117 | commit_graft_sha1_access); | |
118 | } | |
119 | ||
120 | int register_commit_graft(struct repository *r, struct commit_graft *graft, | |
121 | int ignore_dups) | |
122 | { | |
123 | int pos = commit_graft_pos(r, graft->oid.hash); | |
124 | ||
125 | if (0 <= pos) { | |
126 | if (ignore_dups) | |
127 | free(graft); | |
128 | else { | |
129 | free(r->parsed_objects->grafts[pos]); | |
130 | r->parsed_objects->grafts[pos] = graft; | |
131 | } | |
132 | return 1; | |
133 | } | |
134 | pos = -pos - 1; | |
135 | ALLOC_GROW(r->parsed_objects->grafts, | |
136 | r->parsed_objects->grafts_nr + 1, | |
137 | r->parsed_objects->grafts_alloc); | |
138 | r->parsed_objects->grafts_nr++; | |
139 | if (pos < r->parsed_objects->grafts_nr) | |
140 | memmove(r->parsed_objects->grafts + pos + 1, | |
141 | r->parsed_objects->grafts + pos, | |
142 | (r->parsed_objects->grafts_nr - pos - 1) * | |
143 | sizeof(*r->parsed_objects->grafts)); | |
144 | r->parsed_objects->grafts[pos] = graft; | |
145 | return 0; | |
146 | } | |
147 | ||
148 | struct commit_graft *read_graft_line(struct strbuf *line) | |
149 | { | |
150 | /* The format is just "Commit Parent1 Parent2 ...\n" */ | |
151 | int i, phase; | |
152 | const char *tail = NULL; | |
153 | struct commit_graft *graft = NULL; | |
154 | struct object_id dummy_oid, *oid; | |
155 | ||
156 | strbuf_rtrim(line); | |
157 | if (!line->len || line->buf[0] == '#') | |
158 | return NULL; | |
159 | /* | |
160 | * phase 0 verifies line, counts hashes in line and allocates graft | |
161 | * phase 1 fills graft | |
162 | */ | |
163 | for (phase = 0; phase < 2; phase++) { | |
164 | oid = graft ? &graft->oid : &dummy_oid; | |
165 | if (parse_oid_hex(line->buf, oid, &tail)) | |
166 | goto bad_graft_data; | |
167 | for (i = 0; *tail != '\0'; i++) { | |
168 | oid = graft ? &graft->parent[i] : &dummy_oid; | |
169 | if (!isspace(*tail++) || parse_oid_hex(tail, oid, &tail)) | |
170 | goto bad_graft_data; | |
171 | } | |
172 | if (!graft) { | |
173 | graft = xmalloc(st_add(sizeof(*graft), | |
174 | st_mult(sizeof(struct object_id), i))); | |
175 | graft->nr_parent = i; | |
176 | } | |
177 | } | |
178 | return graft; | |
179 | ||
180 | bad_graft_data: | |
181 | error("bad graft data: %s", line->buf); | |
182 | assert(!graft); | |
183 | return NULL; | |
184 | } | |
185 | ||
186 | static int read_graft_file(struct repository *r, const char *graft_file) | |
187 | { | |
188 | FILE *fp = fopen_or_warn(graft_file, "r"); | |
189 | struct strbuf buf = STRBUF_INIT; | |
190 | if (!fp) | |
191 | return -1; | |
192 | if (advice_graft_file_deprecated) | |
193 | advise(_("Support for <GIT_DIR>/info/grafts is deprecated\n" | |
194 | "and will be removed in a future Git version.\n" | |
195 | "\n" | |
196 | "Please use \"git replace --convert-graft-file\"\n" | |
197 | "to convert the grafts into replace refs.\n" | |
198 | "\n" | |
199 | "Turn this message off by running\n" | |
200 | "\"git config advice.graftFileDeprecated false\"")); | |
201 | while (!strbuf_getwholeline(&buf, fp, '\n')) { | |
202 | /* The format is just "Commit Parent1 Parent2 ...\n" */ | |
203 | struct commit_graft *graft = read_graft_line(&buf); | |
204 | if (!graft) | |
205 | continue; | |
206 | if (register_commit_graft(r, graft, 1)) | |
207 | error("duplicate graft data: %s", buf.buf); | |
208 | } | |
209 | fclose(fp); | |
210 | strbuf_release(&buf); | |
211 | return 0; | |
212 | } | |
213 | ||
214 | void prepare_commit_graft(struct repository *r) | |
215 | { | |
216 | char *graft_file; | |
217 | ||
218 | if (r->parsed_objects->commit_graft_prepared) | |
219 | return; | |
220 | if (!startup_info->have_repository) | |
221 | return; | |
222 | ||
223 | graft_file = get_graft_file(r); | |
224 | read_graft_file(r, graft_file); | |
225 | /* make sure shallows are read */ | |
226 | is_repository_shallow(r); | |
227 | r->parsed_objects->commit_graft_prepared = 1; | |
228 | } | |
229 | ||
230 | struct commit_graft *lookup_commit_graft(struct repository *r, const struct object_id *oid) | |
231 | { | |
232 | int pos; | |
233 | prepare_commit_graft(r); | |
234 | pos = commit_graft_pos(r, oid->hash); | |
235 | if (pos < 0) | |
236 | return NULL; | |
237 | return r->parsed_objects->grafts[pos]; | |
238 | } | |
239 | ||
240 | int for_each_commit_graft(each_commit_graft_fn fn, void *cb_data) | |
241 | { | |
242 | int i, ret; | |
243 | for (i = ret = 0; i < the_repository->parsed_objects->grafts_nr && !ret; i++) | |
244 | ret = fn(the_repository->parsed_objects->grafts[i], cb_data); | |
245 | return ret; | |
246 | } | |
247 | ||
248 | int unregister_shallow(const struct object_id *oid) | |
249 | { | |
250 | int pos = commit_graft_pos(the_repository, oid->hash); | |
251 | if (pos < 0) | |
252 | return -1; | |
253 | if (pos + 1 < the_repository->parsed_objects->grafts_nr) | |
254 | MOVE_ARRAY(the_repository->parsed_objects->grafts + pos, | |
255 | the_repository->parsed_objects->grafts + pos + 1, | |
256 | the_repository->parsed_objects->grafts_nr - pos - 1); | |
257 | the_repository->parsed_objects->grafts_nr--; | |
258 | return 0; | |
259 | } | |
260 | ||
261 | struct commit_buffer { | |
262 | void *buffer; | |
263 | unsigned long size; | |
264 | }; | |
265 | define_commit_slab(buffer_slab, struct commit_buffer); | |
266 | ||
267 | struct buffer_slab *allocate_commit_buffer_slab(void) | |
268 | { | |
269 | struct buffer_slab *bs = xmalloc(sizeof(*bs)); | |
270 | init_buffer_slab(bs); | |
271 | return bs; | |
272 | } | |
273 | ||
274 | void free_commit_buffer_slab(struct buffer_slab *bs) | |
275 | { | |
276 | clear_buffer_slab(bs); | |
277 | free(bs); | |
278 | } | |
279 | ||
280 | void set_commit_buffer(struct repository *r, struct commit *commit, void *buffer, unsigned long size) | |
281 | { | |
282 | struct commit_buffer *v = buffer_slab_at( | |
283 | r->parsed_objects->buffer_slab, commit); | |
284 | v->buffer = buffer; | |
285 | v->size = size; | |
286 | } | |
287 | ||
288 | const void *get_cached_commit_buffer(struct repository *r, const struct commit *commit, unsigned long *sizep) | |
289 | { | |
290 | struct commit_buffer *v = buffer_slab_peek( | |
291 | r->parsed_objects->buffer_slab, commit); | |
292 | if (!v) { | |
293 | if (sizep) | |
294 | *sizep = 0; | |
295 | return NULL; | |
296 | } | |
297 | if (sizep) | |
298 | *sizep = v->size; | |
299 | return v->buffer; | |
300 | } | |
301 | ||
302 | const void *repo_get_commit_buffer(struct repository *r, | |
303 | const struct commit *commit, | |
304 | unsigned long *sizep) | |
305 | { | |
306 | const void *ret = get_cached_commit_buffer(r, commit, sizep); | |
307 | if (!ret) { | |
308 | enum object_type type; | |
309 | unsigned long size; | |
310 | ret = repo_read_object_file(r, &commit->object.oid, &type, &size); | |
311 | if (!ret) | |
312 | die("cannot read commit object %s", | |
313 | oid_to_hex(&commit->object.oid)); | |
314 | if (type != OBJ_COMMIT) | |
315 | die("expected commit for %s, got %s", | |
316 | oid_to_hex(&commit->object.oid), type_name(type)); | |
317 | if (sizep) | |
318 | *sizep = size; | |
319 | } | |
320 | return ret; | |
321 | } | |
322 | ||
323 | void repo_unuse_commit_buffer(struct repository *r, | |
324 | const struct commit *commit, | |
325 | const void *buffer) | |
326 | { | |
327 | struct commit_buffer *v = buffer_slab_peek( | |
328 | r->parsed_objects->buffer_slab, commit); | |
329 | if (!(v && v->buffer == buffer)) | |
330 | free((void *)buffer); | |
331 | } | |
332 | ||
333 | void free_commit_buffer(struct parsed_object_pool *pool, struct commit *commit) | |
334 | { | |
335 | struct commit_buffer *v = buffer_slab_peek( | |
336 | pool->buffer_slab, commit); | |
337 | if (v) { | |
338 | FREE_AND_NULL(v->buffer); | |
339 | v->size = 0; | |
340 | } | |
341 | } | |
342 | ||
343 | static inline void set_commit_tree(struct commit *c, struct tree *t) | |
344 | { | |
345 | c->maybe_tree = t; | |
346 | } | |
347 | ||
348 | struct tree *repo_get_commit_tree(struct repository *r, | |
349 | const struct commit *commit) | |
350 | { | |
351 | if (commit->maybe_tree || !commit->object.parsed) | |
352 | return commit->maybe_tree; | |
353 | ||
354 | if (commit->graph_pos != COMMIT_NOT_FROM_GRAPH) | |
355 | return get_commit_tree_in_graph(r, commit); | |
356 | ||
357 | return NULL; | |
358 | } | |
359 | ||
360 | struct object_id *get_commit_tree_oid(const struct commit *commit) | |
361 | { | |
362 | struct tree *tree = get_commit_tree(commit); | |
363 | return tree ? &tree->object.oid : NULL; | |
364 | } | |
365 | ||
366 | void release_commit_memory(struct parsed_object_pool *pool, struct commit *c) | |
367 | { | |
368 | set_commit_tree(c, NULL); | |
369 | free_commit_buffer(pool, c); | |
370 | c->index = 0; | |
371 | free_commit_list(c->parents); | |
372 | ||
373 | c->object.parsed = 0; | |
374 | } | |
375 | ||
376 | const void *detach_commit_buffer(struct commit *commit, unsigned long *sizep) | |
377 | { | |
378 | struct commit_buffer *v = buffer_slab_peek( | |
379 | the_repository->parsed_objects->buffer_slab, commit); | |
380 | void *ret; | |
381 | ||
382 | if (!v) { | |
383 | if (sizep) | |
384 | *sizep = 0; | |
385 | return NULL; | |
386 | } | |
387 | ret = v->buffer; | |
388 | if (sizep) | |
389 | *sizep = v->size; | |
390 | ||
391 | v->buffer = NULL; | |
392 | v->size = 0; | |
393 | return ret; | |
394 | } | |
395 | ||
396 | int parse_commit_buffer(struct repository *r, struct commit *item, const void *buffer, unsigned long size, int check_graph) | |
397 | { | |
398 | const char *tail = buffer; | |
399 | const char *bufptr = buffer; | |
400 | struct object_id parent; | |
401 | struct commit_list **pptr; | |
402 | struct commit_graft *graft; | |
403 | const int tree_entry_len = the_hash_algo->hexsz + 5; | |
404 | const int parent_entry_len = the_hash_algo->hexsz + 7; | |
405 | struct tree *tree; | |
406 | ||
407 | if (item->object.parsed) | |
408 | return 0; | |
409 | ||
410 | if (item->parents) { | |
411 | /* | |
412 | * Presumably this is leftover from an earlier failed parse; | |
413 | * clear it out in preparation for us re-parsing (we'll hit the | |
414 | * same error, but that's good, since it lets our caller know | |
415 | * the result cannot be trusted. | |
416 | */ | |
417 | free_commit_list(item->parents); | |
418 | item->parents = NULL; | |
419 | } | |
420 | ||
421 | tail += size; | |
422 | if (tail <= bufptr + tree_entry_len + 1 || memcmp(bufptr, "tree ", 5) || | |
423 | bufptr[tree_entry_len] != '\n') | |
424 | return error("bogus commit object %s", oid_to_hex(&item->object.oid)); | |
425 | if (get_oid_hex(bufptr + 5, &parent) < 0) | |
426 | return error("bad tree pointer in commit %s", | |
427 | oid_to_hex(&item->object.oid)); | |
428 | tree = lookup_tree(r, &parent); | |
429 | if (!tree) | |
430 | return error("bad tree pointer %s in commit %s", | |
431 | oid_to_hex(&parent), | |
432 | oid_to_hex(&item->object.oid)); | |
433 | set_commit_tree(item, tree); | |
434 | bufptr += tree_entry_len + 1; /* "tree " + "hex sha1" + "\n" */ | |
435 | pptr = &item->parents; | |
436 | ||
437 | graft = lookup_commit_graft(r, &item->object.oid); | |
438 | while (bufptr + parent_entry_len < tail && !memcmp(bufptr, "parent ", 7)) { | |
439 | struct commit *new_parent; | |
440 | ||
441 | if (tail <= bufptr + parent_entry_len + 1 || | |
442 | get_oid_hex(bufptr + 7, &parent) || | |
443 | bufptr[parent_entry_len] != '\n') | |
444 | return error("bad parents in commit %s", oid_to_hex(&item->object.oid)); | |
445 | bufptr += parent_entry_len + 1; | |
446 | /* | |
447 | * The clone is shallow if nr_parent < 0, and we must | |
448 | * not traverse its real parents even when we unhide them. | |
449 | */ | |
450 | if (graft && (graft->nr_parent < 0 || grafts_replace_parents)) | |
451 | continue; | |
452 | new_parent = lookup_commit(r, &parent); | |
453 | if (!new_parent) | |
454 | return error("bad parent %s in commit %s", | |
455 | oid_to_hex(&parent), | |
456 | oid_to_hex(&item->object.oid)); | |
457 | pptr = &commit_list_insert(new_parent, pptr)->next; | |
458 | } | |
459 | if (graft) { | |
460 | int i; | |
461 | struct commit *new_parent; | |
462 | for (i = 0; i < graft->nr_parent; i++) { | |
463 | new_parent = lookup_commit(r, | |
464 | &graft->parent[i]); | |
465 | if (!new_parent) | |
466 | return error("bad graft parent %s in commit %s", | |
467 | oid_to_hex(&graft->parent[i]), | |
468 | oid_to_hex(&item->object.oid)); | |
469 | pptr = &commit_list_insert(new_parent, pptr)->next; | |
470 | } | |
471 | } | |
472 | item->date = parse_commit_date(bufptr, tail); | |
473 | ||
474 | if (check_graph) | |
475 | load_commit_graph_info(r, item); | |
476 | ||
477 | item->object.parsed = 1; | |
478 | return 0; | |
479 | } | |
480 | ||
481 | int repo_parse_commit_internal(struct repository *r, | |
482 | struct commit *item, | |
483 | int quiet_on_missing, | |
484 | int use_commit_graph) | |
485 | { | |
486 | enum object_type type; | |
487 | void *buffer; | |
488 | unsigned long size; | |
489 | int ret; | |
490 | ||
491 | if (!item) | |
492 | return -1; | |
493 | if (item->object.parsed) | |
494 | return 0; | |
495 | if (use_commit_graph && parse_commit_in_graph(r, item)) | |
496 | return 0; | |
497 | buffer = repo_read_object_file(r, &item->object.oid, &type, &size); | |
498 | if (!buffer) | |
499 | return quiet_on_missing ? -1 : | |
500 | error("Could not read %s", | |
501 | oid_to_hex(&item->object.oid)); | |
502 | if (type != OBJ_COMMIT) { | |
503 | free(buffer); | |
504 | return error("Object %s not a commit", | |
505 | oid_to_hex(&item->object.oid)); | |
506 | } | |
507 | ||
508 | ret = parse_commit_buffer(r, item, buffer, size, 0); | |
509 | if (save_commit_buffer && !ret) { | |
510 | set_commit_buffer(r, item, buffer, size); | |
511 | return 0; | |
512 | } | |
513 | free(buffer); | |
514 | return ret; | |
515 | } | |
516 | ||
517 | int repo_parse_commit_gently(struct repository *r, | |
518 | struct commit *item, int quiet_on_missing) | |
519 | { | |
520 | return repo_parse_commit_internal(r, item, quiet_on_missing, 1); | |
521 | } | |
522 | ||
523 | void parse_commit_or_die(struct commit *item) | |
524 | { | |
525 | if (parse_commit(item)) | |
526 | die("unable to parse commit %s", | |
527 | item ? oid_to_hex(&item->object.oid) : "(null)"); | |
528 | } | |
529 | ||
530 | int find_commit_subject(const char *commit_buffer, const char **subject) | |
531 | { | |
532 | const char *eol; | |
533 | const char *p = commit_buffer; | |
534 | ||
535 | while (*p && (*p != '\n' || p[1] != '\n')) | |
536 | p++; | |
537 | if (*p) { | |
538 | p = skip_blank_lines(p + 2); | |
539 | eol = strchrnul(p, '\n'); | |
540 | } else | |
541 | eol = p; | |
542 | ||
543 | *subject = p; | |
544 | ||
545 | return eol - p; | |
546 | } | |
547 | ||
548 | struct commit_list *commit_list_insert(struct commit *item, struct commit_list **list_p) | |
549 | { | |
550 | struct commit_list *new_list = xmalloc(sizeof(struct commit_list)); | |
551 | new_list->item = item; | |
552 | new_list->next = *list_p; | |
553 | *list_p = new_list; | |
554 | return new_list; | |
555 | } | |
556 | ||
557 | unsigned commit_list_count(const struct commit_list *l) | |
558 | { | |
559 | unsigned c = 0; | |
560 | for (; l; l = l->next ) | |
561 | c++; | |
562 | return c; | |
563 | } | |
564 | ||
565 | struct commit_list *copy_commit_list(struct commit_list *list) | |
566 | { | |
567 | struct commit_list *head = NULL; | |
568 | struct commit_list **pp = &head; | |
569 | while (list) { | |
570 | pp = commit_list_append(list->item, pp); | |
571 | list = list->next; | |
572 | } | |
573 | return head; | |
574 | } | |
575 | ||
576 | void free_commit_list(struct commit_list *list) | |
577 | { | |
578 | while (list) | |
579 | pop_commit(&list); | |
580 | } | |
581 | ||
582 | struct commit_list * commit_list_insert_by_date(struct commit *item, struct commit_list **list) | |
583 | { | |
584 | struct commit_list **pp = list; | |
585 | struct commit_list *p; | |
586 | while ((p = *pp) != NULL) { | |
587 | if (p->item->date < item->date) { | |
588 | break; | |
589 | } | |
590 | pp = &p->next; | |
591 | } | |
592 | return commit_list_insert(item, pp); | |
593 | } | |
594 | ||
595 | static int commit_list_compare_by_date(const void *a, const void *b) | |
596 | { | |
597 | timestamp_t a_date = ((const struct commit_list *)a)->item->date; | |
598 | timestamp_t b_date = ((const struct commit_list *)b)->item->date; | |
599 | if (a_date < b_date) | |
600 | return 1; | |
601 | if (a_date > b_date) | |
602 | return -1; | |
603 | return 0; | |
604 | } | |
605 | ||
606 | static void *commit_list_get_next(const void *a) | |
607 | { | |
608 | return ((const struct commit_list *)a)->next; | |
609 | } | |
610 | ||
611 | static void commit_list_set_next(void *a, void *next) | |
612 | { | |
613 | ((struct commit_list *)a)->next = next; | |
614 | } | |
615 | ||
616 | void commit_list_sort_by_date(struct commit_list **list) | |
617 | { | |
618 | *list = llist_mergesort(*list, commit_list_get_next, commit_list_set_next, | |
619 | commit_list_compare_by_date); | |
620 | } | |
621 | ||
622 | struct commit *pop_most_recent_commit(struct commit_list **list, | |
623 | unsigned int mark) | |
624 | { | |
625 | struct commit *ret = pop_commit(list); | |
626 | struct commit_list *parents = ret->parents; | |
627 | ||
628 | while (parents) { | |
629 | struct commit *commit = parents->item; | |
630 | if (!parse_commit(commit) && !(commit->object.flags & mark)) { | |
631 | commit->object.flags |= mark; | |
632 | commit_list_insert_by_date(commit, list); | |
633 | } | |
634 | parents = parents->next; | |
635 | } | |
636 | return ret; | |
637 | } | |
638 | ||
639 | static void clear_commit_marks_1(struct commit_list **plist, | |
640 | struct commit *commit, unsigned int mark) | |
641 | { | |
642 | while (commit) { | |
643 | struct commit_list *parents; | |
644 | ||
645 | if (!(mark & commit->object.flags)) | |
646 | return; | |
647 | ||
648 | commit->object.flags &= ~mark; | |
649 | ||
650 | parents = commit->parents; | |
651 | if (!parents) | |
652 | return; | |
653 | ||
654 | while ((parents = parents->next)) | |
655 | commit_list_insert(parents->item, plist); | |
656 | ||
657 | commit = commit->parents->item; | |
658 | } | |
659 | } | |
660 | ||
661 | void clear_commit_marks_many(int nr, struct commit **commit, unsigned int mark) | |
662 | { | |
663 | struct commit_list *list = NULL; | |
664 | ||
665 | while (nr--) { | |
666 | clear_commit_marks_1(&list, *commit, mark); | |
667 | commit++; | |
668 | } | |
669 | while (list) | |
670 | clear_commit_marks_1(&list, pop_commit(&list), mark); | |
671 | } | |
672 | ||
673 | void clear_commit_marks(struct commit *commit, unsigned int mark) | |
674 | { | |
675 | clear_commit_marks_many(1, &commit, mark); | |
676 | } | |
677 | ||
678 | struct commit *pop_commit(struct commit_list **stack) | |
679 | { | |
680 | struct commit_list *top = *stack; | |
681 | struct commit *item = top ? top->item : NULL; | |
682 | ||
683 | if (top) { | |
684 | *stack = top->next; | |
685 | free(top); | |
686 | } | |
687 | return item; | |
688 | } | |
689 | ||
690 | /* | |
691 | * Topological sort support | |
692 | */ | |
693 | ||
694 | /* count number of children that have not been emitted */ | |
695 | define_commit_slab(indegree_slab, int); | |
696 | ||
697 | define_commit_slab(author_date_slab, timestamp_t); | |
698 | ||
699 | void record_author_date(struct author_date_slab *author_date, | |
700 | struct commit *commit) | |
701 | { | |
702 | const char *buffer = get_commit_buffer(commit, NULL); | |
703 | struct ident_split ident; | |
704 | const char *ident_line; | |
705 | size_t ident_len; | |
706 | char *date_end; | |
707 | timestamp_t date; | |
708 | ||
709 | ident_line = find_commit_header(buffer, "author", &ident_len); | |
710 | if (!ident_line) | |
711 | goto fail_exit; /* no author line */ | |
712 | if (split_ident_line(&ident, ident_line, ident_len) || | |
713 | !ident.date_begin || !ident.date_end) | |
714 | goto fail_exit; /* malformed "author" line */ | |
715 | ||
716 | date = parse_timestamp(ident.date_begin, &date_end, 10); | |
717 | if (date_end != ident.date_end) | |
718 | goto fail_exit; /* malformed date */ | |
719 | *(author_date_slab_at(author_date, commit)) = date; | |
720 | ||
721 | fail_exit: | |
722 | unuse_commit_buffer(commit, buffer); | |
723 | } | |
724 | ||
725 | int compare_commits_by_author_date(const void *a_, const void *b_, | |
726 | void *cb_data) | |
727 | { | |
728 | const struct commit *a = a_, *b = b_; | |
729 | struct author_date_slab *author_date = cb_data; | |
730 | timestamp_t a_date = *(author_date_slab_at(author_date, a)); | |
731 | timestamp_t b_date = *(author_date_slab_at(author_date, b)); | |
732 | ||
733 | /* newer commits with larger date first */ | |
734 | if (a_date < b_date) | |
735 | return 1; | |
736 | else if (a_date > b_date) | |
737 | return -1; | |
738 | return 0; | |
739 | } | |
740 | ||
741 | int compare_commits_by_gen_then_commit_date(const void *a_, const void *b_, void *unused) | |
742 | { | |
743 | const struct commit *a = a_, *b = b_; | |
744 | ||
745 | /* newer commits first */ | |
746 | if (a->generation < b->generation) | |
747 | return 1; | |
748 | else if (a->generation > b->generation) | |
749 | return -1; | |
750 | ||
751 | /* use date as a heuristic when generations are equal */ | |
752 | if (a->date < b->date) | |
753 | return 1; | |
754 | else if (a->date > b->date) | |
755 | return -1; | |
756 | return 0; | |
757 | } | |
758 | ||
759 | int compare_commits_by_commit_date(const void *a_, const void *b_, void *unused) | |
760 | { | |
761 | const struct commit *a = a_, *b = b_; | |
762 | /* newer commits with larger date first */ | |
763 | if (a->date < b->date) | |
764 | return 1; | |
765 | else if (a->date > b->date) | |
766 | return -1; | |
767 | return 0; | |
768 | } | |
769 | ||
770 | /* | |
771 | * Performs an in-place topological sort on the list supplied. | |
772 | */ | |
773 | void sort_in_topological_order(struct commit_list **list, enum rev_sort_order sort_order) | |
774 | { | |
775 | struct commit_list *next, *orig = *list; | |
776 | struct commit_list **pptr; | |
777 | struct indegree_slab indegree; | |
778 | struct prio_queue queue; | |
779 | struct commit *commit; | |
780 | struct author_date_slab author_date; | |
781 | ||
782 | if (!orig) | |
783 | return; | |
784 | *list = NULL; | |
785 | ||
786 | init_indegree_slab(&indegree); | |
787 | memset(&queue, '\0', sizeof(queue)); | |
788 | ||
789 | switch (sort_order) { | |
790 | default: /* REV_SORT_IN_GRAPH_ORDER */ | |
791 | queue.compare = NULL; | |
792 | break; | |
793 | case REV_SORT_BY_COMMIT_DATE: | |
794 | queue.compare = compare_commits_by_commit_date; | |
795 | break; | |
796 | case REV_SORT_BY_AUTHOR_DATE: | |
797 | init_author_date_slab(&author_date); | |
798 | queue.compare = compare_commits_by_author_date; | |
799 | queue.cb_data = &author_date; | |
800 | break; | |
801 | } | |
802 | ||
803 | /* Mark them and clear the indegree */ | |
804 | for (next = orig; next; next = next->next) { | |
805 | struct commit *commit = next->item; | |
806 | *(indegree_slab_at(&indegree, commit)) = 1; | |
807 | /* also record the author dates, if needed */ | |
808 | if (sort_order == REV_SORT_BY_AUTHOR_DATE) | |
809 | record_author_date(&author_date, commit); | |
810 | } | |
811 | ||
812 | /* update the indegree */ | |
813 | for (next = orig; next; next = next->next) { | |
814 | struct commit_list *parents = next->item->parents; | |
815 | while (parents) { | |
816 | struct commit *parent = parents->item; | |
817 | int *pi = indegree_slab_at(&indegree, parent); | |
818 | ||
819 | if (*pi) | |
820 | (*pi)++; | |
821 | parents = parents->next; | |
822 | } | |
823 | } | |
824 | ||
825 | /* | |
826 | * find the tips | |
827 | * | |
828 | * tips are nodes not reachable from any other node in the list | |
829 | * | |
830 | * the tips serve as a starting set for the work queue. | |
831 | */ | |
832 | for (next = orig; next; next = next->next) { | |
833 | struct commit *commit = next->item; | |
834 | ||
835 | if (*(indegree_slab_at(&indegree, commit)) == 1) | |
836 | prio_queue_put(&queue, commit); | |
837 | } | |
838 | ||
839 | /* | |
840 | * This is unfortunate; the initial tips need to be shown | |
841 | * in the order given from the revision traversal machinery. | |
842 | */ | |
843 | if (sort_order == REV_SORT_IN_GRAPH_ORDER) | |
844 | prio_queue_reverse(&queue); | |
845 | ||
846 | /* We no longer need the commit list */ | |
847 | free_commit_list(orig); | |
848 | ||
849 | pptr = list; | |
850 | *list = NULL; | |
851 | while ((commit = prio_queue_get(&queue)) != NULL) { | |
852 | struct commit_list *parents; | |
853 | ||
854 | for (parents = commit->parents; parents ; parents = parents->next) { | |
855 | struct commit *parent = parents->item; | |
856 | int *pi = indegree_slab_at(&indegree, parent); | |
857 | ||
858 | if (!*pi) | |
859 | continue; | |
860 | ||
861 | /* | |
862 | * parents are only enqueued for emission | |
863 | * when all their children have been emitted thereby | |
864 | * guaranteeing topological order. | |
865 | */ | |
866 | if (--(*pi) == 1) | |
867 | prio_queue_put(&queue, parent); | |
868 | } | |
869 | /* | |
870 | * all children of commit have already been | |
871 | * emitted. we can emit it now. | |
872 | */ | |
873 | *(indegree_slab_at(&indegree, commit)) = 0; | |
874 | ||
875 | pptr = &commit_list_insert(commit, pptr)->next; | |
876 | } | |
877 | ||
878 | clear_indegree_slab(&indegree); | |
879 | clear_prio_queue(&queue); | |
880 | if (sort_order == REV_SORT_BY_AUTHOR_DATE) | |
881 | clear_author_date_slab(&author_date); | |
882 | } | |
883 | ||
884 | struct rev_collect { | |
885 | struct commit **commit; | |
886 | int nr; | |
887 | int alloc; | |
888 | unsigned int initial : 1; | |
889 | }; | |
890 | ||
891 | static void add_one_commit(struct object_id *oid, struct rev_collect *revs) | |
892 | { | |
893 | struct commit *commit; | |
894 | ||
895 | if (is_null_oid(oid)) | |
896 | return; | |
897 | ||
898 | commit = lookup_commit(the_repository, oid); | |
899 | if (!commit || | |
900 | (commit->object.flags & TMP_MARK) || | |
901 | parse_commit(commit)) | |
902 | return; | |
903 | ||
904 | ALLOC_GROW(revs->commit, revs->nr + 1, revs->alloc); | |
905 | revs->commit[revs->nr++] = commit; | |
906 | commit->object.flags |= TMP_MARK; | |
907 | } | |
908 | ||
909 | static int collect_one_reflog_ent(struct object_id *ooid, struct object_id *noid, | |
910 | const char *ident, timestamp_t timestamp, | |
911 | int tz, const char *message, void *cbdata) | |
912 | { | |
913 | struct rev_collect *revs = cbdata; | |
914 | ||
915 | if (revs->initial) { | |
916 | revs->initial = 0; | |
917 | add_one_commit(ooid, revs); | |
918 | } | |
919 | add_one_commit(noid, revs); | |
920 | return 0; | |
921 | } | |
922 | ||
923 | struct commit *get_fork_point(const char *refname, struct commit *commit) | |
924 | { | |
925 | struct object_id oid; | |
926 | struct rev_collect revs; | |
927 | struct commit_list *bases; | |
928 | int i; | |
929 | struct commit *ret = NULL; | |
930 | char *full_refname; | |
931 | ||
932 | switch (dwim_ref(refname, strlen(refname), &oid, &full_refname)) { | |
933 | case 0: | |
934 | die("No such ref: '%s'", refname); | |
935 | case 1: | |
936 | break; /* good */ | |
937 | default: | |
938 | die("Ambiguous refname: '%s'", refname); | |
939 | } | |
940 | ||
941 | memset(&revs, 0, sizeof(revs)); | |
942 | revs.initial = 1; | |
943 | for_each_reflog_ent(full_refname, collect_one_reflog_ent, &revs); | |
944 | ||
945 | if (!revs.nr) | |
946 | add_one_commit(&oid, &revs); | |
947 | ||
948 | for (i = 0; i < revs.nr; i++) | |
949 | revs.commit[i]->object.flags &= ~TMP_MARK; | |
950 | ||
951 | bases = get_merge_bases_many(commit, revs.nr, revs.commit); | |
952 | ||
953 | /* | |
954 | * There should be one and only one merge base, when we found | |
955 | * a common ancestor among reflog entries. | |
956 | */ | |
957 | if (!bases || bases->next) | |
958 | goto cleanup_return; | |
959 | ||
960 | /* And the found one must be one of the reflog entries */ | |
961 | for (i = 0; i < revs.nr; i++) | |
962 | if (&bases->item->object == &revs.commit[i]->object) | |
963 | break; /* found */ | |
964 | if (revs.nr <= i) | |
965 | goto cleanup_return; | |
966 | ||
967 | ret = bases->item; | |
968 | ||
969 | cleanup_return: | |
970 | free_commit_list(bases); | |
971 | free(full_refname); | |
972 | return ret; | |
973 | } | |
974 | ||
975 | /* | |
976 | * Indexed by hash algorithm identifier. | |
977 | */ | |
978 | static const char *gpg_sig_headers[] = { | |
979 | NULL, | |
980 | "gpgsig", | |
981 | "gpgsig-sha256", | |
982 | }; | |
983 | ||
984 | static int do_sign_commit(struct strbuf *buf, const char *keyid) | |
985 | { | |
986 | struct strbuf sig = STRBUF_INIT; | |
987 | int inspos, copypos; | |
988 | const char *eoh; | |
989 | const char *gpg_sig_header = gpg_sig_headers[hash_algo_by_ptr(the_hash_algo)]; | |
990 | int gpg_sig_header_len = strlen(gpg_sig_header); | |
991 | ||
992 | /* find the end of the header */ | |
993 | eoh = strstr(buf->buf, "\n\n"); | |
994 | if (!eoh) | |
995 | inspos = buf->len; | |
996 | else | |
997 | inspos = eoh - buf->buf + 1; | |
998 | ||
999 | if (!keyid || !*keyid) | |
1000 | keyid = get_signing_key(); | |
1001 | if (sign_buffer(buf, &sig, keyid)) { | |
1002 | strbuf_release(&sig); | |
1003 | return -1; | |
1004 | } | |
1005 | ||
1006 | for (copypos = 0; sig.buf[copypos]; ) { | |
1007 | const char *bol = sig.buf + copypos; | |
1008 | const char *eol = strchrnul(bol, '\n'); | |
1009 | int len = (eol - bol) + !!*eol; | |
1010 | ||
1011 | if (!copypos) { | |
1012 | strbuf_insert(buf, inspos, gpg_sig_header, gpg_sig_header_len); | |
1013 | inspos += gpg_sig_header_len; | |
1014 | } | |
1015 | strbuf_insertstr(buf, inspos++, " "); | |
1016 | strbuf_insert(buf, inspos, bol, len); | |
1017 | inspos += len; | |
1018 | copypos += len; | |
1019 | } | |
1020 | strbuf_release(&sig); | |
1021 | return 0; | |
1022 | } | |
1023 | ||
1024 | int parse_signed_commit(const struct commit *commit, | |
1025 | struct strbuf *payload, struct strbuf *signature) | |
1026 | { | |
1027 | ||
1028 | unsigned long size; | |
1029 | const char *buffer = get_commit_buffer(commit, &size); | |
1030 | int in_signature, saw_signature = -1; | |
1031 | const char *line, *tail; | |
1032 | const char *gpg_sig_header = gpg_sig_headers[hash_algo_by_ptr(the_hash_algo)]; | |
1033 | int gpg_sig_header_len = strlen(gpg_sig_header); | |
1034 | ||
1035 | line = buffer; | |
1036 | tail = buffer + size; | |
1037 | in_signature = 0; | |
1038 | saw_signature = 0; | |
1039 | while (line < tail) { | |
1040 | const char *sig = NULL; | |
1041 | const char *next = memchr(line, '\n', tail - line); | |
1042 | ||
1043 | next = next ? next + 1 : tail; | |
1044 | if (in_signature && line[0] == ' ') | |
1045 | sig = line + 1; | |
1046 | else if (starts_with(line, gpg_sig_header) && | |
1047 | line[gpg_sig_header_len] == ' ') | |
1048 | sig = line + gpg_sig_header_len + 1; | |
1049 | if (sig) { | |
1050 | strbuf_add(signature, sig, next - sig); | |
1051 | saw_signature = 1; | |
1052 | in_signature = 1; | |
1053 | } else { | |
1054 | if (*line == '\n') | |
1055 | /* dump the whole remainder of the buffer */ | |
1056 | next = tail; | |
1057 | strbuf_add(payload, line, next - line); | |
1058 | in_signature = 0; | |
1059 | } | |
1060 | line = next; | |
1061 | } | |
1062 | unuse_commit_buffer(commit, buffer); | |
1063 | return saw_signature; | |
1064 | } | |
1065 | ||
1066 | int remove_signature(struct strbuf *buf) | |
1067 | { | |
1068 | const char *line = buf->buf; | |
1069 | const char *tail = buf->buf + buf->len; | |
1070 | int in_signature = 0; | |
1071 | const char *sig_start = NULL; | |
1072 | const char *sig_end = NULL; | |
1073 | ||
1074 | while (line < tail) { | |
1075 | const char *next = memchr(line, '\n', tail - line); | |
1076 | next = next ? next + 1 : tail; | |
1077 | ||
1078 | if (in_signature && line[0] == ' ') | |
1079 | sig_end = next; | |
1080 | else if (starts_with(line, "gpgsig")) { | |
1081 | int i; | |
1082 | for (i = 1; i < GIT_HASH_NALGOS; i++) { | |
1083 | const char *p; | |
1084 | if (skip_prefix(line, gpg_sig_headers[i], &p) && | |
1085 | *p == ' ') { | |
1086 | sig_start = line; | |
1087 | sig_end = next; | |
1088 | in_signature = 1; | |
1089 | } | |
1090 | } | |
1091 | } else { | |
1092 | if (*line == '\n') | |
1093 | /* dump the whole remainder of the buffer */ | |
1094 | next = tail; | |
1095 | in_signature = 0; | |
1096 | } | |
1097 | line = next; | |
1098 | } | |
1099 | ||
1100 | if (sig_start) | |
1101 | strbuf_remove(buf, sig_start - buf->buf, sig_end - sig_start); | |
1102 | ||
1103 | return sig_start != NULL; | |
1104 | } | |
1105 | ||
1106 | static void handle_signed_tag(struct commit *parent, struct commit_extra_header ***tail) | |
1107 | { | |
1108 | struct merge_remote_desc *desc; | |
1109 | struct commit_extra_header *mergetag; | |
1110 | char *buf; | |
1111 | unsigned long size, len; | |
1112 | enum object_type type; | |
1113 | ||
1114 | desc = merge_remote_util(parent); | |
1115 | if (!desc || !desc->obj) | |
1116 | return; | |
1117 | buf = read_object_file(&desc->obj->oid, &type, &size); | |
1118 | if (!buf || type != OBJ_TAG) | |
1119 | goto free_return; | |
1120 | len = parse_signature(buf, size); | |
1121 | if (size == len) | |
1122 | goto free_return; | |
1123 | /* | |
1124 | * We could verify this signature and either omit the tag when | |
1125 | * it does not validate, but the integrator may not have the | |
1126 | * public key of the signer of the tag he is merging, while a | |
1127 | * later auditor may have it while auditing, so let's not run | |
1128 | * verify-signed-buffer here for now... | |
1129 | * | |
1130 | * if (verify_signed_buffer(buf, len, buf + len, size - len, ...)) | |
1131 | * warn("warning: signed tag unverified."); | |
1132 | */ | |
1133 | mergetag = xcalloc(1, sizeof(*mergetag)); | |
1134 | mergetag->key = xstrdup("mergetag"); | |
1135 | mergetag->value = buf; | |
1136 | mergetag->len = size; | |
1137 | ||
1138 | **tail = mergetag; | |
1139 | *tail = &mergetag->next; | |
1140 | return; | |
1141 | ||
1142 | free_return: | |
1143 | free(buf); | |
1144 | } | |
1145 | ||
1146 | int check_commit_signature(const struct commit *commit, struct signature_check *sigc) | |
1147 | { | |
1148 | struct strbuf payload = STRBUF_INIT; | |
1149 | struct strbuf signature = STRBUF_INIT; | |
1150 | int ret = 1; | |
1151 | ||
1152 | sigc->result = 'N'; | |
1153 | ||
1154 | if (parse_signed_commit(commit, &payload, &signature) <= 0) | |
1155 | goto out; | |
1156 | ret = check_signature(payload.buf, payload.len, signature.buf, | |
1157 | signature.len, sigc); | |
1158 | ||
1159 | out: | |
1160 | strbuf_release(&payload); | |
1161 | strbuf_release(&signature); | |
1162 | ||
1163 | return ret; | |
1164 | } | |
1165 | ||
1166 | void verify_merge_signature(struct commit *commit, int verbosity, | |
1167 | int check_trust) | |
1168 | { | |
1169 | char hex[GIT_MAX_HEXSZ + 1]; | |
1170 | struct signature_check signature_check; | |
1171 | int ret; | |
1172 | memset(&signature_check, 0, sizeof(signature_check)); | |
1173 | ||
1174 | ret = check_commit_signature(commit, &signature_check); | |
1175 | ||
1176 | find_unique_abbrev_r(hex, &commit->object.oid, DEFAULT_ABBREV); | |
1177 | switch (signature_check.result) { | |
1178 | case 'G': | |
1179 | if (ret || (check_trust && signature_check.trust_level < TRUST_MARGINAL)) | |
1180 | die(_("Commit %s has an untrusted GPG signature, " | |
1181 | "allegedly by %s."), hex, signature_check.signer); | |
1182 | break; | |
1183 | case 'B': | |
1184 | die(_("Commit %s has a bad GPG signature " | |
1185 | "allegedly by %s."), hex, signature_check.signer); | |
1186 | default: /* 'N' */ | |
1187 | die(_("Commit %s does not have a GPG signature."), hex); | |
1188 | } | |
1189 | if (verbosity >= 0 && signature_check.result == 'G') | |
1190 | printf(_("Commit %s has a good GPG signature by %s\n"), | |
1191 | hex, signature_check.signer); | |
1192 | ||
1193 | signature_check_clear(&signature_check); | |
1194 | } | |
1195 | ||
1196 | void append_merge_tag_headers(struct commit_list *parents, | |
1197 | struct commit_extra_header ***tail) | |
1198 | { | |
1199 | while (parents) { | |
1200 | struct commit *parent = parents->item; | |
1201 | handle_signed_tag(parent, tail); | |
1202 | parents = parents->next; | |
1203 | } | |
1204 | } | |
1205 | ||
1206 | static void add_extra_header(struct strbuf *buffer, | |
1207 | struct commit_extra_header *extra) | |
1208 | { | |
1209 | strbuf_addstr(buffer, extra->key); | |
1210 | if (extra->len) | |
1211 | strbuf_add_lines(buffer, " ", extra->value, extra->len); | |
1212 | else | |
1213 | strbuf_addch(buffer, '\n'); | |
1214 | } | |
1215 | ||
1216 | struct commit_extra_header *read_commit_extra_headers(struct commit *commit, | |
1217 | const char **exclude) | |
1218 | { | |
1219 | struct commit_extra_header *extra = NULL; | |
1220 | unsigned long size; | |
1221 | const char *buffer = get_commit_buffer(commit, &size); | |
1222 | extra = read_commit_extra_header_lines(buffer, size, exclude); | |
1223 | unuse_commit_buffer(commit, buffer); | |
1224 | return extra; | |
1225 | } | |
1226 | ||
1227 | int for_each_mergetag(each_mergetag_fn fn, struct commit *commit, void *data) | |
1228 | { | |
1229 | struct commit_extra_header *extra, *to_free; | |
1230 | int res = 0; | |
1231 | ||
1232 | to_free = read_commit_extra_headers(commit, NULL); | |
1233 | for (extra = to_free; !res && extra; extra = extra->next) { | |
1234 | if (strcmp(extra->key, "mergetag")) | |
1235 | continue; /* not a merge tag */ | |
1236 | res = fn(commit, extra, data); | |
1237 | } | |
1238 | free_commit_extra_headers(to_free); | |
1239 | return res; | |
1240 | } | |
1241 | ||
1242 | static inline int standard_header_field(const char *field, size_t len) | |
1243 | { | |
1244 | return ((len == 4 && !memcmp(field, "tree", 4)) || | |
1245 | (len == 6 && !memcmp(field, "parent", 6)) || | |
1246 | (len == 6 && !memcmp(field, "author", 6)) || | |
1247 | (len == 9 && !memcmp(field, "committer", 9)) || | |
1248 | (len == 8 && !memcmp(field, "encoding", 8))); | |
1249 | } | |
1250 | ||
1251 | static int excluded_header_field(const char *field, size_t len, const char **exclude) | |
1252 | { | |
1253 | if (!exclude) | |
1254 | return 0; | |
1255 | ||
1256 | while (*exclude) { | |
1257 | size_t xlen = strlen(*exclude); | |
1258 | if (len == xlen && !memcmp(field, *exclude, xlen)) | |
1259 | return 1; | |
1260 | exclude++; | |
1261 | } | |
1262 | return 0; | |
1263 | } | |
1264 | ||
1265 | static struct commit_extra_header *read_commit_extra_header_lines( | |
1266 | const char *buffer, size_t size, | |
1267 | const char **exclude) | |
1268 | { | |
1269 | struct commit_extra_header *extra = NULL, **tail = &extra, *it = NULL; | |
1270 | const char *line, *next, *eof, *eob; | |
1271 | struct strbuf buf = STRBUF_INIT; | |
1272 | ||
1273 | for (line = buffer, eob = line + size; | |
1274 | line < eob && *line != '\n'; | |
1275 | line = next) { | |
1276 | next = memchr(line, '\n', eob - line); | |
1277 | next = next ? next + 1 : eob; | |
1278 | if (*line == ' ') { | |
1279 | /* continuation */ | |
1280 | if (it) | |
1281 | strbuf_add(&buf, line + 1, next - (line + 1)); | |
1282 | continue; | |
1283 | } | |
1284 | if (it) | |
1285 | it->value = strbuf_detach(&buf, &it->len); | |
1286 | strbuf_reset(&buf); | |
1287 | it = NULL; | |
1288 | ||
1289 | eof = memchr(line, ' ', next - line); | |
1290 | if (!eof) | |
1291 | eof = next; | |
1292 | else if (standard_header_field(line, eof - line) || | |
1293 | excluded_header_field(line, eof - line, exclude)) | |
1294 | continue; | |
1295 | ||
1296 | it = xcalloc(1, sizeof(*it)); | |
1297 | it->key = xmemdupz(line, eof-line); | |
1298 | *tail = it; | |
1299 | tail = &it->next; | |
1300 | if (eof + 1 < next) | |
1301 | strbuf_add(&buf, eof + 1, next - (eof + 1)); | |
1302 | } | |
1303 | if (it) | |
1304 | it->value = strbuf_detach(&buf, &it->len); | |
1305 | return extra; | |
1306 | } | |
1307 | ||
1308 | void free_commit_extra_headers(struct commit_extra_header *extra) | |
1309 | { | |
1310 | while (extra) { | |
1311 | struct commit_extra_header *next = extra->next; | |
1312 | free(extra->key); | |
1313 | free(extra->value); | |
1314 | free(extra); | |
1315 | extra = next; | |
1316 | } | |
1317 | } | |
1318 | ||
1319 | int commit_tree(const char *msg, size_t msg_len, const struct object_id *tree, | |
1320 | struct commit_list *parents, struct object_id *ret, | |
1321 | const char *author, const char *sign_commit) | |
1322 | { | |
1323 | struct commit_extra_header *extra = NULL, **tail = &extra; | |
1324 | int result; | |
1325 | ||
1326 | append_merge_tag_headers(parents, &tail); | |
1327 | result = commit_tree_extended(msg, msg_len, tree, parents, ret, | |
1328 | author, sign_commit, extra); | |
1329 | free_commit_extra_headers(extra); | |
1330 | return result; | |
1331 | } | |
1332 | ||
1333 | static int find_invalid_utf8(const char *buf, int len) | |
1334 | { | |
1335 | int offset = 0; | |
1336 | static const unsigned int max_codepoint[] = { | |
1337 | 0x7f, 0x7ff, 0xffff, 0x10ffff | |
1338 | }; | |
1339 | ||
1340 | while (len) { | |
1341 | unsigned char c = *buf++; | |
1342 | int bytes, bad_offset; | |
1343 | unsigned int codepoint; | |
1344 | unsigned int min_val, max_val; | |
1345 | ||
1346 | len--; | |
1347 | offset++; | |
1348 | ||
1349 | /* Simple US-ASCII? No worries. */ | |
1350 | if (c < 0x80) | |
1351 | continue; | |
1352 | ||
1353 | bad_offset = offset-1; | |
1354 | ||
1355 | /* | |
1356 | * Count how many more high bits set: that's how | |
1357 | * many more bytes this sequence should have. | |
1358 | */ | |
1359 | bytes = 0; | |
1360 | while (c & 0x40) { | |
1361 | c <<= 1; | |
1362 | bytes++; | |
1363 | } | |
1364 | ||
1365 | /* | |
1366 | * Must be between 1 and 3 more bytes. Longer sequences result in | |
1367 | * codepoints beyond U+10FFFF, which are guaranteed never to exist. | |
1368 | */ | |
1369 | if (bytes < 1 || 3 < bytes) | |
1370 | return bad_offset; | |
1371 | ||
1372 | /* Do we *have* that many bytes? */ | |
1373 | if (len < bytes) | |
1374 | return bad_offset; | |
1375 | ||
1376 | /* | |
1377 | * Place the encoded bits at the bottom of the value and compute the | |
1378 | * valid range. | |
1379 | */ | |
1380 | codepoint = (c & 0x7f) >> bytes; | |
1381 | min_val = max_codepoint[bytes-1] + 1; | |
1382 | max_val = max_codepoint[bytes]; | |
1383 | ||
1384 | offset += bytes; | |
1385 | len -= bytes; | |
1386 | ||
1387 | /* And verify that they are good continuation bytes */ | |
1388 | do { | |
1389 | codepoint <<= 6; | |
1390 | codepoint |= *buf & 0x3f; | |
1391 | if ((*buf++ & 0xc0) != 0x80) | |
1392 | return bad_offset; | |
1393 | } while (--bytes); | |
1394 | ||
1395 | /* Reject codepoints that are out of range for the sequence length. */ | |
1396 | if (codepoint < min_val || codepoint > max_val) | |
1397 | return bad_offset; | |
1398 | /* Surrogates are only for UTF-16 and cannot be encoded in UTF-8. */ | |
1399 | if ((codepoint & 0x1ff800) == 0xd800) | |
1400 | return bad_offset; | |
1401 | /* U+xxFFFE and U+xxFFFF are guaranteed non-characters. */ | |
1402 | if ((codepoint & 0xfffe) == 0xfffe) | |
1403 | return bad_offset; | |
1404 | /* So are anything in the range U+FDD0..U+FDEF. */ | |
1405 | if (codepoint >= 0xfdd0 && codepoint <= 0xfdef) | |
1406 | return bad_offset; | |
1407 | } | |
1408 | return -1; | |
1409 | } | |
1410 | ||
1411 | /* | |
1412 | * This verifies that the buffer is in proper utf8 format. | |
1413 | * | |
1414 | * If it isn't, it assumes any non-utf8 characters are Latin1, | |
1415 | * and does the conversion. | |
1416 | */ | |
1417 | static int verify_utf8(struct strbuf *buf) | |
1418 | { | |
1419 | int ok = 1; | |
1420 | long pos = 0; | |
1421 | ||
1422 | for (;;) { | |
1423 | int bad; | |
1424 | unsigned char c; | |
1425 | unsigned char replace[2]; | |
1426 | ||
1427 | bad = find_invalid_utf8(buf->buf + pos, buf->len - pos); | |
1428 | if (bad < 0) | |
1429 | return ok; | |
1430 | pos += bad; | |
1431 | ok = 0; | |
1432 | c = buf->buf[pos]; | |
1433 | strbuf_remove(buf, pos, 1); | |
1434 | ||
1435 | /* We know 'c' must be in the range 128-255 */ | |
1436 | replace[0] = 0xc0 + (c >> 6); | |
1437 | replace[1] = 0x80 + (c & 0x3f); | |
1438 | strbuf_insert(buf, pos, replace, 2); | |
1439 | pos += 2; | |
1440 | } | |
1441 | } | |
1442 | ||
1443 | static const char commit_utf8_warn[] = | |
1444 | N_("Warning: commit message did not conform to UTF-8.\n" | |
1445 | "You may want to amend it after fixing the message, or set the config\n" | |
1446 | "variable i18n.commitencoding to the encoding your project uses.\n"); | |
1447 | ||
1448 | int commit_tree_extended(const char *msg, size_t msg_len, | |
1449 | const struct object_id *tree, | |
1450 | struct commit_list *parents, struct object_id *ret, | |
1451 | const char *author, const char *sign_commit, | |
1452 | struct commit_extra_header *extra) | |
1453 | { | |
1454 | int result; | |
1455 | int encoding_is_utf8; | |
1456 | struct strbuf buffer; | |
1457 | ||
1458 | assert_oid_type(tree, OBJ_TREE); | |
1459 | ||
1460 | if (memchr(msg, '\0', msg_len)) | |
1461 | return error("a NUL byte in commit log message not allowed."); | |
1462 | ||
1463 | /* Not having i18n.commitencoding is the same as having utf-8 */ | |
1464 | encoding_is_utf8 = is_encoding_utf8(git_commit_encoding); | |
1465 | ||
1466 | strbuf_init(&buffer, 8192); /* should avoid reallocs for the headers */ | |
1467 | strbuf_addf(&buffer, "tree %s\n", oid_to_hex(tree)); | |
1468 | ||
1469 | /* | |
1470 | * NOTE! This ordering means that the same exact tree merged with a | |
1471 | * different order of parents will be a _different_ changeset even | |
1472 | * if everything else stays the same. | |
1473 | */ | |
1474 | while (parents) { | |
1475 | struct commit *parent = pop_commit(&parents); | |
1476 | strbuf_addf(&buffer, "parent %s\n", | |
1477 | oid_to_hex(&parent->object.oid)); | |
1478 | } | |
1479 | ||
1480 | /* Person/date information */ | |
1481 | if (!author) | |
1482 | author = git_author_info(IDENT_STRICT); | |
1483 | strbuf_addf(&buffer, "author %s\n", author); | |
1484 | strbuf_addf(&buffer, "committer %s\n", git_committer_info(IDENT_STRICT)); | |
1485 | if (!encoding_is_utf8) | |
1486 | strbuf_addf(&buffer, "encoding %s\n", git_commit_encoding); | |
1487 | ||
1488 | while (extra) { | |
1489 | add_extra_header(&buffer, extra); | |
1490 | extra = extra->next; | |
1491 | } | |
1492 | strbuf_addch(&buffer, '\n'); | |
1493 | ||
1494 | /* And add the comment */ | |
1495 | strbuf_add(&buffer, msg, msg_len); | |
1496 | ||
1497 | /* And check the encoding */ | |
1498 | if (encoding_is_utf8 && !verify_utf8(&buffer)) | |
1499 | fprintf(stderr, _(commit_utf8_warn)); | |
1500 | ||
1501 | if (sign_commit && do_sign_commit(&buffer, sign_commit)) { | |
1502 | result = -1; | |
1503 | goto out; | |
1504 | } | |
1505 | ||
1506 | result = write_object_file(buffer.buf, buffer.len, commit_type, ret); | |
1507 | out: | |
1508 | strbuf_release(&buffer); | |
1509 | return result; | |
1510 | } | |
1511 | ||
1512 | define_commit_slab(merge_desc_slab, struct merge_remote_desc *); | |
1513 | static struct merge_desc_slab merge_desc_slab = COMMIT_SLAB_INIT(1, merge_desc_slab); | |
1514 | ||
1515 | struct merge_remote_desc *merge_remote_util(struct commit *commit) | |
1516 | { | |
1517 | return *merge_desc_slab_at(&merge_desc_slab, commit); | |
1518 | } | |
1519 | ||
1520 | void set_merge_remote_desc(struct commit *commit, | |
1521 | const char *name, struct object *obj) | |
1522 | { | |
1523 | struct merge_remote_desc *desc; | |
1524 | FLEX_ALLOC_STR(desc, name, name); | |
1525 | desc->obj = obj; | |
1526 | *merge_desc_slab_at(&merge_desc_slab, commit) = desc; | |
1527 | } | |
1528 | ||
1529 | struct commit *get_merge_parent(const char *name) | |
1530 | { | |
1531 | struct object *obj; | |
1532 | struct commit *commit; | |
1533 | struct object_id oid; | |
1534 | if (get_oid(name, &oid)) | |
1535 | return NULL; | |
1536 | obj = parse_object(the_repository, &oid); | |
1537 | commit = (struct commit *)peel_to_type(name, 0, obj, OBJ_COMMIT); | |
1538 | if (commit && !merge_remote_util(commit)) | |
1539 | set_merge_remote_desc(commit, name, obj); | |
1540 | return commit; | |
1541 | } | |
1542 | ||
1543 | /* | |
1544 | * Append a commit to the end of the commit_list. | |
1545 | * | |
1546 | * next starts by pointing to the variable that holds the head of an | |
1547 | * empty commit_list, and is updated to point to the "next" field of | |
1548 | * the last item on the list as new commits are appended. | |
1549 | * | |
1550 | * Usage example: | |
1551 | * | |
1552 | * struct commit_list *list; | |
1553 | * struct commit_list **next = &list; | |
1554 | * | |
1555 | * next = commit_list_append(c1, next); | |
1556 | * next = commit_list_append(c2, next); | |
1557 | * assert(commit_list_count(list) == 2); | |
1558 | * return list; | |
1559 | */ | |
1560 | struct commit_list **commit_list_append(struct commit *commit, | |
1561 | struct commit_list **next) | |
1562 | { | |
1563 | struct commit_list *new_commit = xmalloc(sizeof(struct commit_list)); | |
1564 | new_commit->item = commit; | |
1565 | *next = new_commit; | |
1566 | new_commit->next = NULL; | |
1567 | return &new_commit->next; | |
1568 | } | |
1569 | ||
1570 | const char *find_commit_header(const char *msg, const char *key, size_t *out_len) | |
1571 | { | |
1572 | int key_len = strlen(key); | |
1573 | const char *line = msg; | |
1574 | ||
1575 | while (line) { | |
1576 | const char *eol = strchrnul(line, '\n'); | |
1577 | ||
1578 | if (line == eol) | |
1579 | return NULL; | |
1580 | ||
1581 | if (eol - line > key_len && | |
1582 | !strncmp(line, key, key_len) && | |
1583 | line[key_len] == ' ') { | |
1584 | *out_len = eol - line - key_len - 1; | |
1585 | return line + key_len + 1; | |
1586 | } | |
1587 | line = *eol ? eol + 1 : NULL; | |
1588 | } | |
1589 | return NULL; | |
1590 | } | |
1591 | ||
1592 | /* | |
1593 | * Inspect the given string and determine the true "end" of the log message, in | |
1594 | * order to find where to put a new Signed-off-by: line. Ignored are | |
1595 | * trailing comment lines and blank lines. To support "git commit -s | |
1596 | * --amend" on an existing commit, we also ignore "Conflicts:". To | |
1597 | * support "git commit -v", we truncate at cut lines. | |
1598 | * | |
1599 | * Returns the number of bytes from the tail to ignore, to be fed as | |
1600 | * the second parameter to append_signoff(). | |
1601 | */ | |
1602 | size_t ignore_non_trailer(const char *buf, size_t len) | |
1603 | { | |
1604 | size_t boc = 0; | |
1605 | size_t bol = 0; | |
1606 | int in_old_conflicts_block = 0; | |
1607 | size_t cutoff = wt_status_locate_end(buf, len); | |
1608 | ||
1609 | while (bol < cutoff) { | |
1610 | const char *next_line = memchr(buf + bol, '\n', len - bol); | |
1611 | ||
1612 | if (!next_line) | |
1613 | next_line = buf + len; | |
1614 | else | |
1615 | next_line++; | |
1616 | ||
1617 | if (buf[bol] == comment_line_char || buf[bol] == '\n') { | |
1618 | /* is this the first of the run of comments? */ | |
1619 | if (!boc) | |
1620 | boc = bol; | |
1621 | /* otherwise, it is just continuing */ | |
1622 | } else if (starts_with(buf + bol, "Conflicts:\n")) { | |
1623 | in_old_conflicts_block = 1; | |
1624 | if (!boc) | |
1625 | boc = bol; | |
1626 | } else if (in_old_conflicts_block && buf[bol] == '\t') { | |
1627 | ; /* a pathname in the conflicts block */ | |
1628 | } else if (boc) { | |
1629 | /* the previous was not trailing comment */ | |
1630 | boc = 0; | |
1631 | in_old_conflicts_block = 0; | |
1632 | } | |
1633 | bol = next_line - buf; | |
1634 | } | |
1635 | return boc ? len - boc : len - cutoff; | |
1636 | } | |
1637 | ||
1638 | int run_commit_hook(int editor_is_used, const char *index_file, | |
1639 | const char *name, ...) | |
1640 | { | |
1641 | struct argv_array hook_env = ARGV_ARRAY_INIT; | |
1642 | va_list args; | |
1643 | int ret; | |
1644 | ||
1645 | argv_array_pushf(&hook_env, "GIT_INDEX_FILE=%s", index_file); | |
1646 | ||
1647 | /* | |
1648 | * Let the hook know that no editor will be launched. | |
1649 | */ | |
1650 | if (!editor_is_used) | |
1651 | argv_array_push(&hook_env, "GIT_EDITOR=:"); | |
1652 | ||
1653 | va_start(args, name); | |
1654 | ret = run_hook_ve(hook_env.argv,name, args); | |
1655 | va_end(args); | |
1656 | argv_array_clear(&hook_env); | |
1657 | ||
1658 | return ret; | |
1659 | } |