1#include "cache.h"
2#include "tag.h"
3#include "commit.h"
4#include "pkt-line.h"
5#include "utf8.h"
6#include "diff.h"
7#include "revision.h"
8#include "notes.h"
9#include "gpg-interface.h"
10#include "mergesort.h"
11#include "commit-slab.h"
12#include "prio-queue.h"
13static struct commit_extra_header *read_commit_extra_header_lines(const char *buf, size_t len, const char **);
15int save_commit_buffer = 1;
17const char *commit_type = "commit";
19static int commit_count;
20static struct commit *check_commit(struct object *obj,
22 const unsigned char *sha1,
23 int quiet)
24{
25 if (obj->type != OBJ_COMMIT) {
26 if (!quiet)
27 error("Object %s is a %s, not a commit",
28 sha1_to_hex(sha1), typename(obj->type));
29 return NULL;
30 }
31 return (struct commit *) obj;
32}
33struct commit *lookup_commit_reference_gently(const unsigned char *sha1,
35 int quiet)
36{
37 struct object *obj = deref_tag(parse_object(sha1), NULL, 0);
38 if (!obj)
40 return NULL;
41 return check_commit(obj, sha1, quiet);
42}
43struct commit *lookup_commit_reference(const unsigned char *sha1)
45{
46 return lookup_commit_reference_gently(sha1, 0);
47}
48struct commit *lookup_commit_or_die(const unsigned char *sha1, const char *ref_name)
50{
51 struct commit *c = lookup_commit_reference(sha1);
52 if (!c)
53 die(_("could not parse %s"), ref_name);
54 if (hashcmp(sha1, c->object.sha1)) {
55 warning(_("%s %s is not a commit!"),
56 ref_name, sha1_to_hex(sha1));
57 }
58 return c;
59}
60struct commit *lookup_commit(const unsigned char *sha1)
62{
63 struct object *obj = lookup_object(sha1);
64 if (!obj) {
65 struct commit *c = alloc_commit_node();
66 c->index = commit_count++;
67 return create_object(sha1, OBJ_COMMIT, c);
68 }
69 if (!obj->type)
70 obj->type = OBJ_COMMIT;
71 return check_commit(obj, sha1, 0);
72}
73struct commit *lookup_commit_reference_by_name(const char *name)
75{
76 unsigned char sha1[20];
77 struct commit *commit;
78 if (get_sha1_committish(name, sha1))
80 return NULL;
81 commit = lookup_commit_reference(sha1);
82 if (!commit || parse_commit(commit))
83 return NULL;
84 return commit;
85}
86static unsigned long parse_commit_date(const char *buf, const char *tail)
88{
89 const char *dateptr;
90 if (buf + 6 >= tail)
92 return 0;
93 if (memcmp(buf, "author", 6))
94 return 0;
95 while (buf < tail && *buf++ != '\n')
96 /* nada */;
97 if (buf + 9 >= tail)
98 return 0;
99 if (memcmp(buf, "committer", 9))
100 return 0;
101 while (buf < tail && *buf++ != '>')
102 /* nada */;
103 if (buf >= tail)
104 return 0;
105 dateptr = buf;
106 while (buf < tail && *buf++ != '\n')
107 /* nada */;
108 if (buf >= tail)
109 return 0;
110 /* dateptr < buf && buf[-1] == '\n', so strtoul will stop at buf-1 */
111 return strtoul(dateptr, NULL, 10);
112}
113static struct commit_graft **commit_graft;
115static int commit_graft_alloc, commit_graft_nr;
116static int commit_graft_pos(const unsigned char *sha1)
118{
119 int lo, hi;
120 lo = 0;
121 hi = commit_graft_nr;
122 while (lo < hi) {
123 int mi = (lo + hi) / 2;
124 struct commit_graft *graft = commit_graft[mi];
125 int cmp = hashcmp(sha1, graft->sha1);
126 if (!cmp)
127 return mi;
128 if (cmp < 0)
129 hi = mi;
130 else
131 lo = mi + 1;
132 }
133 return -lo - 1;
134}
135int register_commit_graft(struct commit_graft *graft, int ignore_dups)
137{
138 int pos = commit_graft_pos(graft->sha1);
139 if (0 <= pos) {
141 if (ignore_dups)
142 free(graft);
143 else {
144 free(commit_graft[pos]);
145 commit_graft[pos] = graft;
146 }
147 return 1;
148 }
149 pos = -pos - 1;
150 if (commit_graft_alloc <= ++commit_graft_nr) {
151 commit_graft_alloc = alloc_nr(commit_graft_alloc);
152 commit_graft = xrealloc(commit_graft,
153 sizeof(*commit_graft) *
154 commit_graft_alloc);
155 }
156 if (pos < commit_graft_nr)
157 memmove(commit_graft + pos + 1,
158 commit_graft + pos,
159 (commit_graft_nr - pos - 1) *
160 sizeof(*commit_graft));
161 commit_graft[pos] = graft;
162 return 0;
163}
164struct commit_graft *read_graft_line(char *buf, int len)
166{
167 /* The format is just "Commit Parent1 Parent2 ...\n" */
168 int i;
169 struct commit_graft *graft = NULL;
170 while (len && isspace(buf[len-1]))
172 buf[--len] = '\0';
173 if (buf[0] == '#' || buf[0] == '\0')
174 return NULL;
175 if ((len + 1) % 41)
176 goto bad_graft_data;
177 i = (len + 1) / 41 - 1;
178 graft = xmalloc(sizeof(*graft) + 20 * i);
179 graft->nr_parent = i;
180 if (get_sha1_hex(buf, graft->sha1))
181 goto bad_graft_data;
182 for (i = 40; i < len; i += 41) {
183 if (buf[i] != ' ')
184 goto bad_graft_data;
185 if (get_sha1_hex(buf + i + 1, graft->parent[i/41]))
186 goto bad_graft_data;
187 }
188 return graft;
189bad_graft_data:
191 error("bad graft data: %s", buf);
192 free(graft);
193 return NULL;
194}
195static int read_graft_file(const char *graft_file)
197{
198 FILE *fp = fopen(graft_file, "r");
199 char buf[1024];
200 if (!fp)
201 return -1;
202 while (fgets(buf, sizeof(buf), fp)) {
203 /* The format is just "Commit Parent1 Parent2 ...\n" */
204 int len = strlen(buf);
205 struct commit_graft *graft = read_graft_line(buf, len);
206 if (!graft)
207 continue;
208 if (register_commit_graft(graft, 1))
209 error("duplicate graft data: %s", buf);
210 }
211 fclose(fp);
212 return 0;
213}
214static void prepare_commit_graft(void)
216{
217 static int commit_graft_prepared;
218 char *graft_file;
219 if (commit_graft_prepared)
221 return;
222 graft_file = get_graft_file();
223 read_graft_file(graft_file);
224 /* make sure shallows are read */
225 is_repository_shallow();
226 commit_graft_prepared = 1;
227}
228struct commit_graft *lookup_commit_graft(const unsigned char *sha1)
230{
231 int pos;
232 prepare_commit_graft();
233 pos = commit_graft_pos(sha1);
234 if (pos < 0)
235 return NULL;
236 return commit_graft[pos];
237}
238int for_each_commit_graft(each_commit_graft_fn fn, void *cb_data)
240{
241 int i, ret;
242 for (i = ret = 0; i < commit_graft_nr && !ret; i++)
243 ret = fn(commit_graft[i], cb_data);
244 return ret;
245}
246int unregister_shallow(const unsigned char *sha1)
248{
249 int pos = commit_graft_pos(sha1);
250 if (pos < 0)
251 return -1;
252 if (pos + 1 < commit_graft_nr)
253 memmove(commit_graft + pos, commit_graft + pos + 1,
254 sizeof(struct commit_graft *)
255 * (commit_graft_nr - pos - 1));
256 commit_graft_nr--;
257 return 0;
258}
259int parse_commit_buffer(struct commit *item, const void *buffer, unsigned long size)
261{
262 const char *tail = buffer;
263 const char *bufptr = buffer;
264 unsigned char parent[20];
265 struct commit_list **pptr;
266 struct commit_graft *graft;
267 if (item->object.parsed)
269 return 0;
270 item->object.parsed = 1;
271 tail += size;
272 if (tail <= bufptr + 46 || memcmp(bufptr, "tree ", 5) || bufptr[45] != '\n')
273 return error("bogus commit object %s", sha1_to_hex(item->object.sha1));
274 if (get_sha1_hex(bufptr + 5, parent) < 0)
275 return error("bad tree pointer in commit %s",
276 sha1_to_hex(item->object.sha1));
277 item->tree = lookup_tree(parent);
278 bufptr += 46; /* "tree " + "hex sha1" + "\n" */
279 pptr = &item->parents;
280 graft = lookup_commit_graft(item->object.sha1);
282 while (bufptr + 48 < tail && !memcmp(bufptr, "parent ", 7)) {
283 struct commit *new_parent;
284 if (tail <= bufptr + 48 ||
286 get_sha1_hex(bufptr + 7, parent) ||
287 bufptr[47] != '\n')
288 return error("bad parents in commit %s", sha1_to_hex(item->object.sha1));
289 bufptr += 48;
290 /*
291 * The clone is shallow if nr_parent < 0, and we must
292 * not traverse its real parents even when we unhide them.
293 */
294 if (graft && (graft->nr_parent < 0 || grafts_replace_parents))
295 continue;
296 new_parent = lookup_commit(parent);
297 if (new_parent)
298 pptr = &commit_list_insert(new_parent, pptr)->next;
299 }
300 if (graft) {
301 int i;
302 struct commit *new_parent;
303 for (i = 0; i < graft->nr_parent; i++) {
304 new_parent = lookup_commit(graft->parent[i]);
305 if (!new_parent)
306 continue;
307 pptr = &commit_list_insert(new_parent, pptr)->next;
308 }
309 }
310 item->date = parse_commit_date(bufptr, tail);
311 return 0;
313}
314int parse_commit(struct commit *item)
316{
317 enum object_type type;
318 void *buffer;
319 unsigned long size;
320 int ret;
321 if (!item)
323 return -1;
324 if (item->object.parsed)
325 return 0;
326 buffer = read_sha1_file(item->object.sha1, &type, &size);
327 if (!buffer)
328 return error("Could not read %s",
329 sha1_to_hex(item->object.sha1));
330 if (type != OBJ_COMMIT) {
331 free(buffer);
332 return error("Object %s not a commit",
333 sha1_to_hex(item->object.sha1));
334 }
335 ret = parse_commit_buffer(item, buffer, size);
336 if (save_commit_buffer && !ret) {
337 item->buffer = buffer;
338 return 0;
339 }
340 free(buffer);
341 return ret;
342}
343int find_commit_subject(const char *commit_buffer, const char **subject)
345{
346 const char *eol;
347 const char *p = commit_buffer;
348 while (*p && (*p != '\n' || p[1] != '\n'))
350 p++;
351 if (*p) {
352 p += 2;
353 for (eol = p; *eol && *eol != '\n'; eol++)
354 ; /* do nothing */
355 } else
356 eol = p;
357 *subject = p;
359 return eol - p;
361}
362struct commit_list *commit_list_insert(struct commit *item, struct commit_list **list_p)
364{
365 struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
366 new_list->item = item;
367 new_list->next = *list_p;
368 *list_p = new_list;
369 return new_list;
370}
371unsigned commit_list_count(const struct commit_list *l)
373{
374 unsigned c = 0;
375 for (; l; l = l->next )
376 c++;
377 return c;
378}
379void free_commit_list(struct commit_list *list)
381{
382 while (list) {
383 struct commit_list *temp = list;
384 list = temp->next;
385 free(temp);
386 }
387}
388struct commit_list * commit_list_insert_by_date(struct commit *item, struct commit_list **list)
390{
391 struct commit_list **pp = list;
392 struct commit_list *p;
393 while ((p = *pp) != NULL) {
394 if (p->item->date < item->date) {
395 break;
396 }
397 pp = &p->next;
398 }
399 return commit_list_insert(item, pp);
400}
401static int commit_list_compare_by_date(const void *a, const void *b)
403{
404 unsigned long a_date = ((const struct commit_list *)a)->item->date;
405 unsigned long b_date = ((const struct commit_list *)b)->item->date;
406 if (a_date < b_date)
407 return 1;
408 if (a_date > b_date)
409 return -1;
410 return 0;
411}
412static void *commit_list_get_next(const void *a)
414{
415 return ((const struct commit_list *)a)->next;
416}
417static void commit_list_set_next(void *a, void *next)
419{
420 ((struct commit_list *)a)->next = next;
421}
422void commit_list_sort_by_date(struct commit_list **list)
424{
425 *list = llist_mergesort(*list, commit_list_get_next, commit_list_set_next,
426 commit_list_compare_by_date);
427}
428struct commit *pop_most_recent_commit(struct commit_list **list,
430 unsigned int mark)
431{
432 struct commit *ret = (*list)->item;
433 struct commit_list *parents = ret->parents;
434 struct commit_list *old = *list;
435 *list = (*list)->next;
437 free(old);
438 while (parents) {
440 struct commit *commit = parents->item;
441 if (!parse_commit(commit) && !(commit->object.flags & mark)) {
442 commit->object.flags |= mark;
443 commit_list_insert_by_date(commit, list);
444 }
445 parents = parents->next;
446 }
447 return ret;
448}
449static void clear_commit_marks_1(struct commit_list **plist,
451 struct commit *commit, unsigned int mark)
452{
453 while (commit) {
454 struct commit_list *parents;
455 if (!(mark & commit->object.flags))
457 return;
458 commit->object.flags &= ~mark;
460 parents = commit->parents;
462 if (!parents)
463 return;
464 while ((parents = parents->next))
466 commit_list_insert(parents->item, plist);
467 commit = commit->parents->item;
469 }
470}
471void clear_commit_marks_many(int nr, struct commit **commit, unsigned int mark)
473{
474 struct commit_list *list = NULL;
475 while (nr--) {
477 commit_list_insert(*commit, &list);
478 commit++;
479 }
480 while (list)
481 clear_commit_marks_1(&list, pop_commit(&list), mark);
482}
483void clear_commit_marks(struct commit *commit, unsigned int mark)
485{
486 clear_commit_marks_many(1, &commit, mark);
487}
488void clear_commit_marks_for_object_array(struct object_array *a, unsigned mark)
490{
491 struct object *object;
492 struct commit *commit;
493 unsigned int i;
494 for (i = 0; i < a->nr; i++) {
496 object = a->objects[i].item;
497 commit = lookup_commit_reference_gently(object->sha1, 1);
498 if (commit)
499 clear_commit_marks(commit, mark);
500 }
501}
502struct commit *pop_commit(struct commit_list **stack)
504{
505 struct commit_list *top = *stack;
506 struct commit *item = top ? top->item : NULL;
507 if (top) {
509 *stack = top->next;
510 free(top);
511 }
512 return item;
513}
514/*
516 * Topological sort support
517 */
518/* count number of children that have not been emitted */
520define_commit_slab(indegree_slab, int);
521/* record author-date for each commit object */
523define_commit_slab(author_date_slab, unsigned long);
524static void record_author_date(struct author_date_slab *author_date,
526 struct commit *commit)
527{
528 const char *buf, *line_end;
529 char *buffer = NULL;
530 struct ident_split ident;
531 char *date_end;
532 unsigned long date;
533 if (!commit->buffer) {
535 unsigned long size;
536 enum object_type type;
537 buffer = read_sha1_file(commit->object.sha1, &type, &size);
538 if (!buffer)
539 return;
540 }
541 for (buf = commit->buffer ? commit->buffer : buffer;
543 buf;
544 buf = line_end + 1) {
545 line_end = strchrnul(buf, '\n');
546 if (prefixcmp(buf, "author ")) {
547 if (!line_end[0] || line_end[1] == '\n')
548 return; /* end of header */
549 continue;
550 }
551 if (split_ident_line(&ident,
552 buf + strlen("author "),
553 line_end - (buf + strlen("author "))) ||
554 !ident.date_begin || !ident.date_end)
555 goto fail_exit; /* malformed "author" line */
556 break;
557 }
558 date = strtoul(ident.date_begin, &date_end, 10);
560 if (date_end != ident.date_end)
561 goto fail_exit; /* malformed date */
562 *(author_date_slab_at(author_date, commit)) = date;
563fail_exit:
565 free(buffer);
566}
567static int compare_commits_by_author_date(const void *a_, const void *b_,
569 void *cb_data)
570{
571 const struct commit *a = a_, *b = b_;
572 struct author_date_slab *author_date = cb_data;
573 unsigned long a_date = *(author_date_slab_at(author_date, a));
574 unsigned long b_date = *(author_date_slab_at(author_date, b));
575 /* newer commits with larger date first */
577 if (a_date < b_date)
578 return 1;
579 else if (a_date > b_date)
580 return -1;
581 return 0;
582}
583int compare_commits_by_commit_date(const void *a_, const void *b_, void *unused)
585{
586 const struct commit *a = a_, *b = b_;
587 /* newer commits with larger date first */
588 if (a->date < b->date)
589 return 1;
590 else if (a->date > b->date)
591 return -1;
592 return 0;
593}
594/*
596 * Performs an in-place topological sort on the list supplied.
597 */
598void sort_in_topological_order(struct commit_list **list, enum rev_sort_order sort_order)
599{
600 struct commit_list *next, *orig = *list;
601 struct commit_list **pptr;
602 struct indegree_slab indegree;
603 struct prio_queue queue;
604 struct commit *commit;
605 struct author_date_slab author_date;
606 if (!orig)
608 return;
609 *list = NULL;
610 init_indegree_slab(&indegree);
612 memset(&queue, '\0', sizeof(queue));
613 switch (sort_order) {
615 default: /* REV_SORT_IN_GRAPH_ORDER */
616 queue.compare = NULL;
617 break;
618 case REV_SORT_BY_COMMIT_DATE:
619 queue.compare = compare_commits_by_commit_date;
620 break;
621 case REV_SORT_BY_AUTHOR_DATE:
622 init_author_date_slab(&author_date);
623 queue.compare = compare_commits_by_author_date;
624 queue.cb_data = &author_date;
625 break;
626 }
627 /* Mark them and clear the indegree */
629 for (next = orig; next; next = next->next) {
630 struct commit *commit = next->item;
631 *(indegree_slab_at(&indegree, commit)) = 1;
632 /* also record the author dates, if needed */
633 if (sort_order == REV_SORT_BY_AUTHOR_DATE)
634 record_author_date(&author_date, commit);
635 }
636 /* update the indegree */
638 for (next = orig; next; next = next->next) {
639 struct commit_list *parents = next->item->parents;
640 while (parents) {
641 struct commit *parent = parents->item;
642 int *pi = indegree_slab_at(&indegree, parent);
643 if (*pi)
645 (*pi)++;
646 parents = parents->next;
647 }
648 }
649 /*
651 * find the tips
652 *
653 * tips are nodes not reachable from any other node in the list
654 *
655 * the tips serve as a starting set for the work queue.
656 */
657 for (next = orig; next; next = next->next) {
658 struct commit *commit = next->item;
659 if (*(indegree_slab_at(&indegree, commit)) == 1)
661 prio_queue_put(&queue, commit);
662 }
663 /*
665 * This is unfortunate; the initial tips need to be shown
666 * in the order given from the revision traversal machinery.
667 */
668 if (sort_order == REV_SORT_IN_GRAPH_ORDER)
669 prio_queue_reverse(&queue);
670 /* We no longer need the commit list */
672 free_commit_list(orig);
673 pptr = list;
675 *list = NULL;
676 while ((commit = prio_queue_get(&queue)) != NULL) {
677 struct commit_list *parents;
678 for (parents = commit->parents; parents ; parents = parents->next) {
680 struct commit *parent = parents->item;
681 int *pi = indegree_slab_at(&indegree, parent);
682 if (!*pi)
684 continue;
685 /*
687 * parents are only enqueued for emission
688 * when all their children have been emitted thereby
689 * guaranteeing topological order.
690 */
691 if (--(*pi) == 1)
692 prio_queue_put(&queue, parent);
693 }
694 /*
695 * all children of commit have already been
696 * emitted. we can emit it now.
697 */
698 *(indegree_slab_at(&indegree, commit)) = 0;
699 pptr = &commit_list_insert(commit, pptr)->next;
701 }
702 clear_indegree_slab(&indegree);
704 clear_prio_queue(&queue);
705 if (sort_order == REV_SORT_BY_AUTHOR_DATE)
706 clear_author_date_slab(&author_date);
707}
708/* merge-base stuff */
710/* bits #0..15 in revision.h */
712#define PARENT1 (1u<<16)
713#define PARENT2 (1u<<17)
714#define STALE (1u<<18)
715#define RESULT (1u<<19)
716static const unsigned all_flags = (PARENT1 | PARENT2 | STALE | RESULT);
718static struct commit *interesting(struct commit_list *list)
720{
721 while (list) {
722 struct commit *commit = list->item;
723 list = list->next;
724 if (commit->object.flags & STALE)
725 continue;
726 return commit;
727 }
728 return NULL;
729}
730/* all input commits in one and twos[] must have been parsed! */
732static struct commit_list *paint_down_to_common(struct commit *one, int n, struct commit **twos)
733{
734 struct commit_list *list = NULL;
735 struct commit_list *result = NULL;
736 int i;
737 one->object.flags |= PARENT1;
739 commit_list_insert_by_date(one, &list);
740 if (!n)
741 return list;
742 for (i = 0; i < n; i++) {
743 twos[i]->object.flags |= PARENT2;
744 commit_list_insert_by_date(twos[i], &list);
745 }
746 while (interesting(list)) {
748 struct commit *commit;
749 struct commit_list *parents;
750 struct commit_list *next;
751 int flags;
752 commit = list->item;
754 next = list->next;
755 free(list);
756 list = next;
757 flags = commit->object.flags & (PARENT1 | PARENT2 | STALE);
759 if (flags == (PARENT1 | PARENT2)) {
760 if (!(commit->object.flags & RESULT)) {
761 commit->object.flags |= RESULT;
762 commit_list_insert_by_date(commit, &result);
763 }
764 /* Mark parents of a found merge stale */
765 flags |= STALE;
766 }
767 parents = commit->parents;
768 while (parents) {
769 struct commit *p = parents->item;
770 parents = parents->next;
771 if ((p->object.flags & flags) == flags)
772 continue;
773 if (parse_commit(p))
774 return NULL;
775 p->object.flags |= flags;
776 commit_list_insert_by_date(p, &list);
777 }
778 }
779 free_commit_list(list);
781 return result;
782}
783static struct commit_list *merge_bases_many(struct commit *one, int n, struct commit **twos)
785{
786 struct commit_list *list = NULL;
787 struct commit_list *result = NULL;
788 int i;
789 for (i = 0; i < n; i++) {
791 if (one == twos[i])
792 /*
793 * We do not mark this even with RESULT so we do not
794 * have to clean it up.
795 */
796 return commit_list_insert(one, &result);
797 }
798 if (parse_commit(one))
800 return NULL;
801 for (i = 0; i < n; i++) {
802 if (parse_commit(twos[i]))
803 return NULL;
804 }
805 list = paint_down_to_common(one, n, twos);
807 while (list) {
809 struct commit_list *next = list->next;
810 if (!(list->item->object.flags & STALE))
811 commit_list_insert_by_date(list->item, &result);
812 free(list);
813 list = next;
814 }
815 return result;
816}
817struct commit_list *get_octopus_merge_bases(struct commit_list *in)
819{
820 struct commit_list *i, *j, *k, *ret = NULL;
821 struct commit_list **pptr = &ret;
822 for (i = in; i; i = i->next) {
824 if (!ret)
825 pptr = &commit_list_insert(i->item, pptr)->next;
826 else {
827 struct commit_list *new = NULL, *end = NULL;
828 for (j = ret; j; j = j->next) {
830 struct commit_list *bases;
831 bases = get_merge_bases(i->item, j->item, 1);
832 if (!new)
833 new = bases;
834 else
835 end->next = bases;
836 for (k = bases; k; k = k->next)
837 end = k;
838 }
839 ret = new;
840 }
841 }
842 return ret;
843}
844static int remove_redundant(struct commit **array, int cnt)
846{
847 /*
848 * Some commit in the array may be an ancestor of
849 * another commit. Move such commit to the end of
850 * the array, and return the number of commits that
851 * are independent from each other.
852 */
853 struct commit **work;
854 unsigned char *redundant;
855 int *filled_index;
856 int i, j, filled;
857 work = xcalloc(cnt, sizeof(*work));
859 redundant = xcalloc(cnt, 1);
860 filled_index = xmalloc(sizeof(*filled_index) * (cnt - 1));
861 for (i = 0; i < cnt; i++)
863 parse_commit(array[i]);
864 for (i = 0; i < cnt; i++) {
865 struct commit_list *common;
866 if (redundant[i])
868 continue;
869 for (j = filled = 0; j < cnt; j++) {
870 if (i == j || redundant[j])
871 continue;
872 filled_index[filled] = j;
873 work[filled++] = array[j];
874 }
875 common = paint_down_to_common(array[i], filled, work);
876 if (array[i]->object.flags & PARENT2)
877 redundant[i] = 1;
878 for (j = 0; j < filled; j++)
879 if (work[j]->object.flags & PARENT1)
880 redundant[filled_index[j]] = 1;
881 clear_commit_marks(array[i], all_flags);
882 for (j = 0; j < filled; j++)
883 clear_commit_marks(work[j], all_flags);
884 free_commit_list(common);
885 }
886 /* Now collect the result */
888 memcpy(work, array, sizeof(*array) * cnt);
889 for (i = filled = 0; i < cnt; i++)
890 if (!redundant[i])
891 array[filled++] = work[i];
892 for (j = filled, i = 0; i < cnt; i++)
893 if (redundant[i])
894 array[j++] = work[i];
895 free(work);
896 free(redundant);
897 free(filled_index);
898 return filled;
899}
900struct commit_list *get_merge_bases_many(struct commit *one,
902 int n,
903 struct commit **twos,
904 int cleanup)
905{
906 struct commit_list *list;
907 struct commit **rslt;
908 struct commit_list *result;
909 int cnt, i;
910 result = merge_bases_many(one, n, twos);
912 for (i = 0; i < n; i++) {
913 if (one == twos[i])
914 return result;
915 }
916 if (!result || !result->next) {
917 if (cleanup) {
918 clear_commit_marks(one, all_flags);
919 clear_commit_marks_many(n, twos, all_flags);
920 }
921 return result;
922 }
923 /* There are more than one */
925 cnt = 0;
926 list = result;
927 while (list) {
928 list = list->next;
929 cnt++;
930 }
931 rslt = xcalloc(cnt, sizeof(*rslt));
932 for (list = result, i = 0; list; list = list->next)
933 rslt[i++] = list->item;
934 free_commit_list(result);
935 clear_commit_marks(one, all_flags);
937 clear_commit_marks_many(n, twos, all_flags);
938 cnt = remove_redundant(rslt, cnt);
940 result = NULL;
941 for (i = 0; i < cnt; i++)
942 commit_list_insert_by_date(rslt[i], &result);
943 free(rslt);
944 return result;
945}
946struct commit_list *get_merge_bases(struct commit *one, struct commit *two,
948 int cleanup)
949{
950 return get_merge_bases_many(one, 1, &two, cleanup);
951}
952/*
954 * Is "commit" a descendant of one of the elements on the "with_commit" list?
955 */
956int is_descendant_of(struct commit *commit, struct commit_list *with_commit)
957{
958 if (!with_commit)
959 return 1;
960 while (with_commit) {
961 struct commit *other;
962 other = with_commit->item;
964 with_commit = with_commit->next;
965 if (in_merge_bases(other, commit))
966 return 1;
967 }
968 return 0;
969}
970/*
972 * Is "commit" an ancestor of one of the "references"?
973 */
974int in_merge_bases_many(struct commit *commit, int nr_reference, struct commit **reference)
975{
976 struct commit_list *bases;
977 int ret = 0, i;
978 if (parse_commit(commit))
980 return ret;
981 for (i = 0; i < nr_reference; i++)
982 if (parse_commit(reference[i]))
983 return ret;
984 bases = paint_down_to_common(commit, nr_reference, reference);
986 if (commit->object.flags & PARENT2)
987 ret = 1;
988 clear_commit_marks(commit, all_flags);
989 clear_commit_marks_many(nr_reference, reference, all_flags);
990 free_commit_list(bases);
991 return ret;
992}
993/*
995 * Is "commit" an ancestor of (i.e. reachable from) the "reference"?
996 */
997int in_merge_bases(struct commit *commit, struct commit *reference)
998{
999 return in_merge_bases_many(commit, 1, &reference);
1000}
1001struct commit_list *reduce_heads(struct commit_list *heads)
1003{
1004 struct commit_list *p;
1005 struct commit_list *result = NULL, **tail = &result;
1006 struct commit **array;
1007 int num_head, i;
1008 if (!heads)
1010 return NULL;
1011 /* Uniquify */
1013 for (p = heads; p; p = p->next)
1014 p->item->object.flags &= ~STALE;
1015 for (p = heads, num_head = 0; p; p = p->next) {
1016 if (p->item->object.flags & STALE)
1017 continue;
1018 p->item->object.flags |= STALE;
1019 num_head++;
1020 }
1021 array = xcalloc(sizeof(*array), num_head);
1022 for (p = heads, i = 0; p; p = p->next) {
1023 if (p->item->object.flags & STALE) {
1024 array[i++] = p->item;
1025 p->item->object.flags &= ~STALE;
1026 }
1027 }
1028 num_head = remove_redundant(array, num_head);
1029 for (i = 0; i < num_head; i++)
1030 tail = &commit_list_insert(array[i], tail)->next;
1031 return result;
1032}
1033static const char gpg_sig_header[] = "gpgsig";
1035static const int gpg_sig_header_len = sizeof(gpg_sig_header) - 1;
1036static int do_sign_commit(struct strbuf *buf, const char *keyid)
1038{
1039 struct strbuf sig = STRBUF_INIT;
1040 int inspos, copypos;
1041 /* find the end of the header */
1043 inspos = strstr(buf->buf, "\n\n") - buf->buf + 1;
1044 if (!keyid || !*keyid)
1046 keyid = get_signing_key();
1047 if (sign_buffer(buf, &sig, keyid)) {
1048 strbuf_release(&sig);
1049 return -1;
1050 }
1051 for (copypos = 0; sig.buf[copypos]; ) {
1053 const char *bol = sig.buf + copypos;
1054 const char *eol = strchrnul(bol, '\n');
1055 int len = (eol - bol) + !!*eol;
1056 if (!copypos) {
1058 strbuf_insert(buf, inspos, gpg_sig_header, gpg_sig_header_len);
1059 inspos += gpg_sig_header_len;
1060 }
1061 strbuf_insert(buf, inspos++, " ", 1);
1062 strbuf_insert(buf, inspos, bol, len);
1063 inspos += len;
1064 copypos += len;
1065 }
1066 strbuf_release(&sig);
1067 return 0;
1068}
1069int parse_signed_commit(const unsigned char *sha1,
1071 struct strbuf *payload, struct strbuf *signature)
1072{
1073 unsigned long size;
1074 enum object_type type;
1075 char *buffer = read_sha1_file(sha1, &type, &size);
1076 int in_signature, saw_signature = -1;
1077 char *line, *tail;
1078 if (!buffer || type != OBJ_COMMIT)
1080 goto cleanup;
1081 line = buffer;
1083 tail = buffer + size;
1084 in_signature = 0;
1085 saw_signature = 0;
1086 while (line < tail) {
1087 const char *sig = NULL;
1088 char *next = memchr(line, '\n', tail - line);
1089 next = next ? next + 1 : tail;
1091 if (in_signature && line[0] == ' ')
1092 sig = line + 1;
1093 else if (!prefixcmp(line, gpg_sig_header) &&
1094 line[gpg_sig_header_len] == ' ')
1095 sig = line + gpg_sig_header_len + 1;
1096 if (sig) {
1097 strbuf_add(signature, sig, next - sig);
1098 saw_signature = 1;
1099 in_signature = 1;
1100 } else {
1101 if (*line == '\n')
1102 /* dump the whole remainder of the buffer */
1103 next = tail;
1104 strbuf_add(payload, line, next - line);
1105 in_signature = 0;
1106 }
1107 line = next;
1108 }
1109 cleanup:
1110 free(buffer);
1111 return saw_signature;
1112}
1113static void handle_signed_tag(struct commit *parent, struct commit_extra_header ***tail)
1115{
1116 struct merge_remote_desc *desc;
1117 struct commit_extra_header *mergetag;
1118 char *buf;
1119 unsigned long size, len;
1120 enum object_type type;
1121 desc = merge_remote_util(parent);
1123 if (!desc || !desc->obj)
1124 return;
1125 buf = read_sha1_file(desc->obj->sha1, &type, &size);
1126 if (!buf || type != OBJ_TAG)
1127 goto free_return;
1128 len = parse_signature(buf, size);
1129 if (size == len)
1130 goto free_return;
1131 /*
1132 * We could verify this signature and either omit the tag when
1133 * it does not validate, but the integrator may not have the
1134 * public key of the signer of the tag he is merging, while a
1135 * later auditor may have it while auditing, so let's not run
1136 * verify-signed-buffer here for now...
1137 *
1138 * if (verify_signed_buffer(buf, len, buf + len, size - len, ...))
1139 * warn("warning: signed tag unverified.");
1140 */
1141 mergetag = xcalloc(1, sizeof(*mergetag));
1142 mergetag->key = xstrdup("mergetag");
1143 mergetag->value = buf;
1144 mergetag->len = size;
1145 **tail = mergetag;
1147 *tail = &mergetag->next;
1148 return;
1149free_return:
1151 free(buf);
1152}
1153static struct {
1155 char result;
1156 const char *check;
1157} sigcheck_gpg_status[] = {
1158 { 'G', "\n[GNUPG:] GOODSIG " },
1159 { 'B', "\n[GNUPG:] BADSIG " },
1160 { 'U', "\n[GNUPG:] TRUST_NEVER" },
1161 { 'U', "\n[GNUPG:] TRUST_UNDEFINED" },
1162};
1163static void parse_gpg_output(struct signature_check *sigc)
1165{
1166 const char *buf = sigc->gpg_status;
1167 int i;
1168 /* Iterate over all search strings */
1170 for (i = 0; i < ARRAY_SIZE(sigcheck_gpg_status); i++) {
1171 const char *found, *next;
1172 if (!prefixcmp(buf, sigcheck_gpg_status[i].check + 1)) {
1174 /* At the very beginning of the buffer */
1175 found = buf + strlen(sigcheck_gpg_status[i].check + 1);
1176 } else {
1177 found = strstr(buf, sigcheck_gpg_status[i].check);
1178 if (!found)
1179 continue;
1180 found += strlen(sigcheck_gpg_status[i].check);
1181 }
1182 sigc->result = sigcheck_gpg_status[i].result;
1183 /* The trust messages are not followed by key/signer information */
1184 if (sigc->result != 'U') {
1185 sigc->key = xmemdupz(found, 16);
1186 found += 17;
1187 next = strchrnul(found, '\n');
1188 sigc->signer = xmemdupz(found, next - found);
1189 }
1190 }
1191}
1192void check_commit_signature(const struct commit* commit, struct signature_check *sigc)
1194{
1195 struct strbuf payload = STRBUF_INIT;
1196 struct strbuf signature = STRBUF_INIT;
1197 struct strbuf gpg_output = STRBUF_INIT;
1198 struct strbuf gpg_status = STRBUF_INIT;
1199 int status;
1200 sigc->result = 'N';
1202 if (parse_signed_commit(commit->object.sha1,
1204 &payload, &signature) <= 0)
1205 goto out;
1206 status = verify_signed_buffer(payload.buf, payload.len,
1207 signature.buf, signature.len,
1208 &gpg_output, &gpg_status);
1209 if (status && !gpg_output.len)
1210 goto out;
1211 sigc->gpg_output = strbuf_detach(&gpg_output, NULL);
1212 sigc->gpg_status = strbuf_detach(&gpg_status, NULL);
1213 parse_gpg_output(sigc);
1214 out:
1216 strbuf_release(&gpg_status);
1217 strbuf_release(&gpg_output);
1218 strbuf_release(&payload);
1219 strbuf_release(&signature);
1220}
1221void append_merge_tag_headers(struct commit_list *parents,
1225 struct commit_extra_header ***tail)
1226{
1227 while (parents) {
1228 struct commit *parent = parents->item;
1229 handle_signed_tag(parent, tail);
1230 parents = parents->next;
1231 }
1232}
1233static void add_extra_header(struct strbuf *buffer,
1235 struct commit_extra_header *extra)
1236{
1237 strbuf_addstr(buffer, extra->key);
1238 if (extra->len)
1239 strbuf_add_lines(buffer, " ", extra->value, extra->len);
1240 else
1241 strbuf_addch(buffer, '\n');
1242}
1243struct commit_extra_header *read_commit_extra_headers(struct commit *commit,
1245 const char **exclude)
1246{
1247 struct commit_extra_header *extra = NULL;
1248 unsigned long size;
1249 enum object_type type;
1250 char *buffer = read_sha1_file(commit->object.sha1, &type, &size);
1251 if (buffer && type == OBJ_COMMIT)
1252 extra = read_commit_extra_header_lines(buffer, size, exclude);
1253 free(buffer);
1254 return extra;
1255}
1256static inline int standard_header_field(const char *field, size_t len)
1258{
1259 return ((len == 4 && !memcmp(field, "tree ", 5)) ||
1260 (len == 6 && !memcmp(field, "parent ", 7)) ||
1261 (len == 6 && !memcmp(field, "author ", 7)) ||
1262 (len == 9 && !memcmp(field, "committer ", 10)) ||
1263 (len == 8 && !memcmp(field, "encoding ", 9)));
1264}
1265static int excluded_header_field(const char *field, size_t len, const char **exclude)
1267{
1268 if (!exclude)
1269 return 0;
1270 while (*exclude) {
1272 size_t xlen = strlen(*exclude);
1273 if (len == xlen &&
1274 !memcmp(field, *exclude, xlen) && field[xlen] == ' ')
1275 return 1;
1276 exclude++;
1277 }
1278 return 0;
1279}
1280static struct commit_extra_header *read_commit_extra_header_lines(
1282 const char *buffer, size_t size,
1283 const char **exclude)
1284{
1285 struct commit_extra_header *extra = NULL, **tail = &extra, *it = NULL;
1286 const char *line, *next, *eof, *eob;
1287 struct strbuf buf = STRBUF_INIT;
1288 for (line = buffer, eob = line + size;
1290 line < eob && *line != '\n';
1291 line = next) {
1292 next = memchr(line, '\n', eob - line);
1293 next = next ? next + 1 : eob;
1294 if (*line == ' ') {
1295 /* continuation */
1296 if (it)
1297 strbuf_add(&buf, line + 1, next - (line + 1));
1298 continue;
1299 }
1300 if (it)
1301 it->value = strbuf_detach(&buf, &it->len);
1302 strbuf_reset(&buf);
1303 it = NULL;
1304 eof = strchr(line, ' ');
1306 if (next <= eof)
1307 eof = next;
1308 if (standard_header_field(line, eof - line) ||
1310 excluded_header_field(line, eof - line, exclude))
1311 continue;
1312 it = xcalloc(1, sizeof(*it));
1314 it->key = xmemdupz(line, eof-line);
1315 *tail = it;
1316 tail = &it->next;
1317 if (eof + 1 < next)
1318 strbuf_add(&buf, eof + 1, next - (eof + 1));
1319 }
1320 if (it)
1321 it->value = strbuf_detach(&buf, &it->len);
1322 return extra;
1323}
1324void free_commit_extra_headers(struct commit_extra_header *extra)
1326{
1327 while (extra) {
1328 struct commit_extra_header *next = extra->next;
1329 free(extra->key);
1330 free(extra->value);
1331 free(extra);
1332 extra = next;
1333 }
1334}
1335int commit_tree(const struct strbuf *msg, unsigned char *tree,
1337 struct commit_list *parents, unsigned char *ret,
1338 const char *author, const char *sign_commit)
1339{
1340 struct commit_extra_header *extra = NULL, **tail = &extra;
1341 int result;
1342 append_merge_tag_headers(parents, &tail);
1344 result = commit_tree_extended(msg, tree, parents, ret,
1345 author, sign_commit, extra);
1346 free_commit_extra_headers(extra);
1347 return result;
1348}
1349static int find_invalid_utf8(const char *buf, int len)
1351{
1352 int offset = 0;
1353 static const unsigned int max_codepoint[] = {
1354 0x7f, 0x7ff, 0xffff, 0x10ffff
1355 };
1356 while (len) {
1358 unsigned char c = *buf++;
1359 int bytes, bad_offset;
1360 unsigned int codepoint;
1361 unsigned int min_val, max_val;
1362 len--;
1364 offset++;
1365 /* Simple US-ASCII? No worries. */
1367 if (c < 0x80)
1368 continue;
1369 bad_offset = offset-1;
1371 /*
1373 * Count how many more high bits set: that's how
1374 * many more bytes this sequence should have.
1375 */
1376 bytes = 0;
1377 while (c & 0x40) {
1378 c <<= 1;
1379 bytes++;
1380 }
1381 /*
1383 * Must be between 1 and 3 more bytes. Longer sequences result in
1384 * codepoints beyond U+10FFFF, which are guaranteed never to exist.
1385 */
1386 if (bytes < 1 || 3 < bytes)
1387 return bad_offset;
1388 /* Do we *have* that many bytes? */
1390 if (len < bytes)
1391 return bad_offset;
1392 /*
1394 * Place the encoded bits at the bottom of the value and compute the
1395 * valid range.
1396 */
1397 codepoint = (c & 0x7f) >> bytes;
1398 min_val = max_codepoint[bytes-1] + 1;
1399 max_val = max_codepoint[bytes];
1400 offset += bytes;
1402 len -= bytes;
1403 /* And verify that they are good continuation bytes */
1405 do {
1406 codepoint <<= 6;
1407 codepoint |= *buf & 0x3f;
1408 if ((*buf++ & 0xc0) != 0x80)
1409 return bad_offset;
1410 } while (--bytes);
1411 /* Reject codepoints that are out of range for the sequence length. */
1413 if (codepoint < min_val || codepoint > max_val)
1414 return bad_offset;
1415 /* Surrogates are only for UTF-16 and cannot be encoded in UTF-8. */
1416 if ((codepoint & 0x1ff800) == 0xd800)
1417 return bad_offset;
1418 /* U+xxFFFE and U+xxFFFF are guaranteed non-characters. */
1419 if ((codepoint & 0xffffe) == 0xfffe)
1420 return bad_offset;
1421 /* So are anything in the range U+FDD0..U+FDEF. */
1422 if (codepoint >= 0xfdd0 && codepoint <= 0xfdef)
1423 return bad_offset;
1424 }
1425 return -1;
1426}
1427/*
1429 * This verifies that the buffer is in proper utf8 format.
1430 *
1431 * If it isn't, it assumes any non-utf8 characters are Latin1,
1432 * and does the conversion.
1433 */
1434static int verify_utf8(struct strbuf *buf)
1435{
1436 int ok = 1;
1437 long pos = 0;
1438 for (;;) {
1440 int bad;
1441 unsigned char c;
1442 unsigned char replace[2];
1443 bad = find_invalid_utf8(buf->buf + pos, buf->len - pos);
1445 if (bad < 0)
1446 return ok;
1447 pos += bad;
1448 ok = 0;
1449 c = buf->buf[pos];
1450 strbuf_remove(buf, pos, 1);
1451 /* We know 'c' must be in the range 128-255 */
1453 replace[0] = 0xc0 + (c >> 6);
1454 replace[1] = 0x80 + (c & 0x3f);
1455 strbuf_insert(buf, pos, replace, 2);
1456 pos += 2;
1457 }
1458}
1459static const char commit_utf8_warn[] =
1461"Warning: commit message did not conform to UTF-8.\n"
1462"You may want to amend it after fixing the message, or set the config\n"
1463"variable i18n.commitencoding to the encoding your project uses.\n";
1464int commit_tree_extended(const struct strbuf *msg, unsigned char *tree,
1466 struct commit_list *parents, unsigned char *ret,
1467 const char *author, const char *sign_commit,
1468 struct commit_extra_header *extra)
1469{
1470 int result;
1471 int encoding_is_utf8;
1472 struct strbuf buffer;
1473 assert_sha1_type(tree, OBJ_TREE);
1475 if (memchr(msg->buf, '\0', msg->len))
1477 return error("a NUL byte in commit log message not allowed.");
1478 /* Not having i18n.commitencoding is the same as having utf-8 */
1480 encoding_is_utf8 = is_encoding_utf8(git_commit_encoding);
1481 strbuf_init(&buffer, 8192); /* should avoid reallocs for the headers */
1483 strbuf_addf(&buffer, "tree %s\n", sha1_to_hex(tree));
1484 /*
1486 * NOTE! This ordering means that the same exact tree merged with a
1487 * different order of parents will be a _different_ changeset even
1488 * if everything else stays the same.
1489 */
1490 while (parents) {
1491 struct commit_list *next = parents->next;
1492 struct commit *parent = parents->item;
1493 strbuf_addf(&buffer, "parent %s\n",
1495 sha1_to_hex(parent->object.sha1));
1496 free(parents);
1497 parents = next;
1498 }
1499 /* Person/date information */
1501 if (!author)
1502 author = git_author_info(IDENT_STRICT);
1503 strbuf_addf(&buffer, "author %s\n", author);
1504 strbuf_addf(&buffer, "committer %s\n", git_committer_info(IDENT_STRICT));
1505 if (!encoding_is_utf8)
1506 strbuf_addf(&buffer, "encoding %s\n", git_commit_encoding);
1507 while (extra) {
1509 add_extra_header(&buffer, extra);
1510 extra = extra->next;
1511 }
1512 strbuf_addch(&buffer, '\n');
1513 /* And add the comment */
1515 strbuf_addbuf(&buffer, msg);
1516 /* And check the encoding */
1518 if (encoding_is_utf8 && !verify_utf8(&buffer))
1519 fprintf(stderr, commit_utf8_warn);
1520 if (sign_commit && do_sign_commit(&buffer, sign_commit))
1522 return -1;
1523 result = write_sha1_file(buffer.buf, buffer.len, commit_type, ret);
1525 strbuf_release(&buffer);
1526 return result;
1527}
1528struct commit *get_merge_parent(const char *name)
1530{
1531 struct object *obj;
1532 struct commit *commit;
1533 unsigned char sha1[20];
1534 if (get_sha1(name, sha1))
1535 return NULL;
1536 obj = parse_object(sha1);
1537 commit = (struct commit *)peel_to_type(name, 0, obj, OBJ_COMMIT);
1538 if (commit && !commit->util) {
1539 struct merge_remote_desc *desc;
1540 desc = xmalloc(sizeof(*desc));
1541 desc->obj = obj;
1542 desc->name = strdup(name);
1543 commit->util = desc;
1544 }
1545 return commit;
1546}
1547/*
1549 * Append a commit to the end of the commit_list.
1550 *
1551 * next starts by pointing to the variable that holds the head of an
1552 * empty commit_list, and is updated to point to the "next" field of
1553 * the last item on the list as new commits are appended.
1554 *
1555 * Usage example:
1556 *
1557 * struct commit_list *list;
1558 * struct commit_list **next = &list;
1559 *
1560 * next = commit_list_append(c1, next);
1561 * next = commit_list_append(c2, next);
1562 * assert(commit_list_count(list) == 2);
1563 * return list;
1564 */
1565struct commit_list **commit_list_append(struct commit *commit,
1566 struct commit_list **next)
1567{
1568 struct commit_list *new = xmalloc(sizeof(struct commit_list));
1569 new->item = commit;
1570 *next = new;
1571 new->next = NULL;
1572 return &new->next;
1573}
1574void print_commit_list(struct commit_list *list,
1576 const char *format_cur,
1577 const char *format_last)
1578{
1579 for ( ; list; list = list->next) {
1580 const char *format = list->next ? format_cur : format_last;
1581 printf(format, sha1_to_hex(list->item->object.sha1));
1582 }
1583}