promisor-remote: skip move_to_tail when no-op
[git/git.git] / shallow.c
1 #include "cache.h"
2 #include "repository.h"
3 #include "tempfile.h"
4 #include "lockfile.h"
5 #include "object-store.h"
6 #include "commit.h"
7 #include "tag.h"
8 #include "pkt-line.h"
9 #include "remote.h"
10 #include "refs.h"
11 #include "sha1-array.h"
12 #include "diff.h"
13 #include "revision.h"
14 #include "commit-slab.h"
15 #include "revision.h"
16 #include "list-objects.h"
17 #include "commit-slab.h"
18 #include "repository.h"
19 #include "commit-reach.h"
20
21 void set_alternate_shallow_file(struct repository *r, const char *path, int override)
22 {
23 if (r->parsed_objects->is_shallow != -1)
24 BUG("is_repository_shallow must not be called before set_alternate_shallow_file");
25 if (r->parsed_objects->alternate_shallow_file && !override)
26 return;
27 free(r->parsed_objects->alternate_shallow_file);
28 r->parsed_objects->alternate_shallow_file = xstrdup_or_null(path);
29 }
30
31 int register_shallow(struct repository *r, const struct object_id *oid)
32 {
33 struct commit_graft *graft =
34 xmalloc(sizeof(struct commit_graft));
35 struct commit *commit = lookup_commit(the_repository, oid);
36
37 oidcpy(&graft->oid, oid);
38 graft->nr_parent = -1;
39 if (commit && commit->object.parsed)
40 commit->parents = NULL;
41 return register_commit_graft(r, graft, 0);
42 }
43
44 int is_repository_shallow(struct repository *r)
45 {
46 /*
47 * NEEDSWORK: This function updates
48 * r->parsed_objects->{is_shallow,shallow_stat} as a side effect but
49 * there is no corresponding function to clear them when the shallow
50 * file is updated.
51 */
52
53 FILE *fp;
54 char buf[1024];
55 const char *path = r->parsed_objects->alternate_shallow_file;
56
57 if (r->parsed_objects->is_shallow >= 0)
58 return r->parsed_objects->is_shallow;
59
60 if (!path)
61 path = git_path_shallow(r);
62 /*
63 * fetch-pack sets '--shallow-file ""' as an indicator that no
64 * shallow file should be used. We could just open it and it
65 * will likely fail. But let's do an explicit check instead.
66 */
67 if (!*path || (fp = fopen(path, "r")) == NULL) {
68 stat_validity_clear(r->parsed_objects->shallow_stat);
69 r->parsed_objects->is_shallow = 0;
70 return r->parsed_objects->is_shallow;
71 }
72 stat_validity_update(r->parsed_objects->shallow_stat, fileno(fp));
73 r->parsed_objects->is_shallow = 1;
74
75 while (fgets(buf, sizeof(buf), fp)) {
76 struct object_id oid;
77 if (get_oid_hex(buf, &oid))
78 die("bad shallow line: %s", buf);
79 register_shallow(r, &oid);
80 }
81 fclose(fp);
82 return r->parsed_objects->is_shallow;
83 }
84
85 /*
86 * TODO: use "int" elemtype instead of "int *" when/if commit-slab
87 * supports a "valid" flag.
88 */
89 define_commit_slab(commit_depth, int *);
90 struct commit_list *get_shallow_commits(struct object_array *heads, int depth,
91 int shallow_flag, int not_shallow_flag)
92 {
93 int i = 0, cur_depth = 0;
94 struct commit_list *result = NULL;
95 struct object_array stack = OBJECT_ARRAY_INIT;
96 struct commit *commit = NULL;
97 struct commit_graft *graft;
98 struct commit_depth depths;
99
100 init_commit_depth(&depths);
101 while (commit || i < heads->nr || stack.nr) {
102 struct commit_list *p;
103 if (!commit) {
104 if (i < heads->nr) {
105 int **depth_slot;
106 commit = (struct commit *)
107 deref_tag(the_repository,
108 heads->objects[i++].item,
109 NULL, 0);
110 if (!commit || commit->object.type != OBJ_COMMIT) {
111 commit = NULL;
112 continue;
113 }
114 depth_slot = commit_depth_at(&depths, commit);
115 if (!*depth_slot)
116 *depth_slot = xmalloc(sizeof(int));
117 **depth_slot = 0;
118 cur_depth = 0;
119 } else {
120 commit = (struct commit *)
121 object_array_pop(&stack);
122 cur_depth = **commit_depth_at(&depths, commit);
123 }
124 }
125 parse_commit_or_die(commit);
126 cur_depth++;
127 if ((depth != INFINITE_DEPTH && cur_depth >= depth) ||
128 (is_repository_shallow(the_repository) && !commit->parents &&
129 (graft = lookup_commit_graft(the_repository, &commit->object.oid)) != NULL &&
130 graft->nr_parent < 0)) {
131 commit_list_insert(commit, &result);
132 commit->object.flags |= shallow_flag;
133 commit = NULL;
134 continue;
135 }
136 commit->object.flags |= not_shallow_flag;
137 for (p = commit->parents, commit = NULL; p; p = p->next) {
138 int **depth_slot = commit_depth_at(&depths, p->item);
139 if (!*depth_slot) {
140 *depth_slot = xmalloc(sizeof(int));
141 **depth_slot = cur_depth;
142 } else {
143 if (cur_depth >= **depth_slot)
144 continue;
145 **depth_slot = cur_depth;
146 }
147 if (p->next)
148 add_object_array(&p->item->object,
149 NULL, &stack);
150 else {
151 commit = p->item;
152 cur_depth = **commit_depth_at(&depths, commit);
153 }
154 }
155 }
156 for (i = 0; i < depths.slab_count; i++) {
157 int j;
158
159 for (j = 0; j < depths.slab_size; j++)
160 free(depths.slab[i][j]);
161 }
162 clear_commit_depth(&depths);
163
164 return result;
165 }
166
167 static void show_commit(struct commit *commit, void *data)
168 {
169 commit_list_insert(commit, data);
170 }
171
172 /*
173 * Given rev-list arguments, run rev-list. All reachable commits
174 * except border ones are marked with not_shallow_flag. Border commits
175 * are marked with shallow_flag. The list of border/shallow commits
176 * are also returned.
177 */
178 struct commit_list *get_shallow_commits_by_rev_list(int ac, const char **av,
179 int shallow_flag,
180 int not_shallow_flag)
181 {
182 struct commit_list *result = NULL, *p;
183 struct commit_list *not_shallow_list = NULL;
184 struct rev_info revs;
185 int both_flags = shallow_flag | not_shallow_flag;
186
187 /*
188 * SHALLOW (excluded) and NOT_SHALLOW (included) should not be
189 * set at this point. But better be safe than sorry.
190 */
191 clear_object_flags(both_flags);
192
193 is_repository_shallow(the_repository); /* make sure shallows are read */
194
195 repo_init_revisions(the_repository, &revs, NULL);
196 save_commit_buffer = 0;
197 setup_revisions(ac, av, &revs, NULL);
198
199 if (prepare_revision_walk(&revs))
200 die("revision walk setup failed");
201 traverse_commit_list(&revs, show_commit, NULL, &not_shallow_list);
202
203 if (!not_shallow_list)
204 die("no commits selected for shallow requests");
205
206 /* Mark all reachable commits as NOT_SHALLOW */
207 for (p = not_shallow_list; p; p = p->next)
208 p->item->object.flags |= not_shallow_flag;
209
210 /*
211 * mark border commits SHALLOW + NOT_SHALLOW.
212 * We cannot clear NOT_SHALLOW right now. Imagine border
213 * commit A is processed first, then commit B, whose parent is
214 * A, later. If NOT_SHALLOW on A is cleared at step 1, B
215 * itself is considered border at step 2, which is incorrect.
216 */
217 for (p = not_shallow_list; p; p = p->next) {
218 struct commit *c = p->item;
219 struct commit_list *parent;
220
221 if (parse_commit(c))
222 die("unable to parse commit %s",
223 oid_to_hex(&c->object.oid));
224
225 for (parent = c->parents; parent; parent = parent->next)
226 if (!(parent->item->object.flags & not_shallow_flag)) {
227 c->object.flags |= shallow_flag;
228 commit_list_insert(c, &result);
229 break;
230 }
231 }
232 free_commit_list(not_shallow_list);
233
234 /*
235 * Now we can clean up NOT_SHALLOW on border commits. Having
236 * both flags set can confuse the caller.
237 */
238 for (p = result; p; p = p->next) {
239 struct object *o = &p->item->object;
240 if ((o->flags & both_flags) == both_flags)
241 o->flags &= ~not_shallow_flag;
242 }
243 return result;
244 }
245
246 static void check_shallow_file_for_update(struct repository *r)
247 {
248 if (r->parsed_objects->is_shallow == -1)
249 BUG("shallow must be initialized by now");
250
251 if (!stat_validity_check(r->parsed_objects->shallow_stat, git_path_shallow(the_repository)))
252 die("shallow file has changed since we read it");
253 }
254
255 #define SEEN_ONLY 1
256 #define VERBOSE 2
257 #define QUICK 4
258
259 struct write_shallow_data {
260 struct strbuf *out;
261 int use_pack_protocol;
262 int count;
263 unsigned flags;
264 };
265
266 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
267 {
268 struct write_shallow_data *data = cb_data;
269 const char *hex = oid_to_hex(&graft->oid);
270 if (graft->nr_parent != -1)
271 return 0;
272 if (data->flags & QUICK) {
273 if (!has_object_file(&graft->oid))
274 return 0;
275 } else if (data->flags & SEEN_ONLY) {
276 struct commit *c = lookup_commit(the_repository, &graft->oid);
277 if (!c || !(c->object.flags & SEEN)) {
278 if (data->flags & VERBOSE)
279 printf("Removing %s from .git/shallow\n",
280 oid_to_hex(&c->object.oid));
281 return 0;
282 }
283 }
284 data->count++;
285 if (data->use_pack_protocol)
286 packet_buf_write(data->out, "shallow %s", hex);
287 else {
288 strbuf_addstr(data->out, hex);
289 strbuf_addch(data->out, '\n');
290 }
291 return 0;
292 }
293
294 static int write_shallow_commits_1(struct strbuf *out, int use_pack_protocol,
295 const struct oid_array *extra,
296 unsigned flags)
297 {
298 struct write_shallow_data data;
299 int i;
300 data.out = out;
301 data.use_pack_protocol = use_pack_protocol;
302 data.count = 0;
303 data.flags = flags;
304 for_each_commit_graft(write_one_shallow, &data);
305 if (!extra)
306 return data.count;
307 for (i = 0; i < extra->nr; i++) {
308 strbuf_addstr(out, oid_to_hex(extra->oid + i));
309 strbuf_addch(out, '\n');
310 data.count++;
311 }
312 return data.count;
313 }
314
315 int write_shallow_commits(struct strbuf *out, int use_pack_protocol,
316 const struct oid_array *extra)
317 {
318 return write_shallow_commits_1(out, use_pack_protocol, extra, 0);
319 }
320
321 const char *setup_temporary_shallow(const struct oid_array *extra)
322 {
323 struct tempfile *temp;
324 struct strbuf sb = STRBUF_INIT;
325
326 if (write_shallow_commits(&sb, 0, extra)) {
327 temp = xmks_tempfile(git_path("shallow_XXXXXX"));
328
329 if (write_in_full(temp->fd, sb.buf, sb.len) < 0 ||
330 close_tempfile_gently(temp) < 0)
331 die_errno("failed to write to %s",
332 get_tempfile_path(temp));
333 strbuf_release(&sb);
334 return get_tempfile_path(temp);
335 }
336 /*
337 * is_repository_shallow() sees empty string as "no shallow
338 * file".
339 */
340 return "";
341 }
342
343 void setup_alternate_shallow(struct lock_file *shallow_lock,
344 const char **alternate_shallow_file,
345 const struct oid_array *extra)
346 {
347 struct strbuf sb = STRBUF_INIT;
348 int fd;
349
350 fd = hold_lock_file_for_update(shallow_lock,
351 git_path_shallow(the_repository),
352 LOCK_DIE_ON_ERROR);
353 check_shallow_file_for_update(the_repository);
354 if (write_shallow_commits(&sb, 0, extra)) {
355 if (write_in_full(fd, sb.buf, sb.len) < 0)
356 die_errno("failed to write to %s",
357 get_lock_file_path(shallow_lock));
358 *alternate_shallow_file = get_lock_file_path(shallow_lock);
359 } else
360 /*
361 * is_repository_shallow() sees empty string as "no
362 * shallow file".
363 */
364 *alternate_shallow_file = "";
365 strbuf_release(&sb);
366 }
367
368 static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
369 {
370 int fd = *(int *)cb;
371 if (graft->nr_parent == -1)
372 packet_write_fmt(fd, "shallow %s\n", oid_to_hex(&graft->oid));
373 return 0;
374 }
375
376 void advertise_shallow_grafts(int fd)
377 {
378 if (!is_repository_shallow(the_repository))
379 return;
380 for_each_commit_graft(advertise_shallow_grafts_cb, &fd);
381 }
382
383 /*
384 * mark_reachable_objects() should have been run prior to this and all
385 * reachable commits marked as "SEEN", except when quick_prune is non-zero,
386 * in which case lines are excised from the shallow file if they refer to
387 * commits that do not exist (any longer).
388 */
389 void prune_shallow(unsigned options)
390 {
391 struct lock_file shallow_lock = LOCK_INIT;
392 struct strbuf sb = STRBUF_INIT;
393 unsigned flags = SEEN_ONLY;
394 int fd;
395
396 if (options & PRUNE_QUICK)
397 flags |= QUICK;
398
399 if (options & PRUNE_SHOW_ONLY) {
400 flags |= VERBOSE;
401 write_shallow_commits_1(&sb, 0, NULL, flags);
402 strbuf_release(&sb);
403 return;
404 }
405 fd = hold_lock_file_for_update(&shallow_lock,
406 git_path_shallow(the_repository),
407 LOCK_DIE_ON_ERROR);
408 check_shallow_file_for_update(the_repository);
409 if (write_shallow_commits_1(&sb, 0, NULL, flags)) {
410 if (write_in_full(fd, sb.buf, sb.len) < 0)
411 die_errno("failed to write to %s",
412 get_lock_file_path(&shallow_lock));
413 commit_lock_file(&shallow_lock);
414 } else {
415 unlink(git_path_shallow(the_repository));
416 rollback_lock_file(&shallow_lock);
417 }
418 strbuf_release(&sb);
419 }
420
421 struct trace_key trace_shallow = TRACE_KEY_INIT(SHALLOW);
422
423 /*
424 * Step 1, split sender shallow commits into "ours" and "theirs"
425 * Step 2, clean "ours" based on .git/shallow
426 */
427 void prepare_shallow_info(struct shallow_info *info, struct oid_array *sa)
428 {
429 int i;
430 trace_printf_key(&trace_shallow, "shallow: prepare_shallow_info\n");
431 memset(info, 0, sizeof(*info));
432 info->shallow = sa;
433 if (!sa)
434 return;
435 ALLOC_ARRAY(info->ours, sa->nr);
436 ALLOC_ARRAY(info->theirs, sa->nr);
437 for (i = 0; i < sa->nr; i++) {
438 if (has_object_file(sa->oid + i)) {
439 struct commit_graft *graft;
440 graft = lookup_commit_graft(the_repository,
441 &sa->oid[i]);
442 if (graft && graft->nr_parent < 0)
443 continue;
444 info->ours[info->nr_ours++] = i;
445 } else
446 info->theirs[info->nr_theirs++] = i;
447 }
448 }
449
450 void clear_shallow_info(struct shallow_info *info)
451 {
452 free(info->ours);
453 free(info->theirs);
454 }
455
456 /* Step 4, remove non-existent ones in "theirs" after getting the pack */
457
458 void remove_nonexistent_theirs_shallow(struct shallow_info *info)
459 {
460 struct object_id *oid = info->shallow->oid;
461 int i, dst;
462 trace_printf_key(&trace_shallow, "shallow: remove_nonexistent_theirs_shallow\n");
463 for (i = dst = 0; i < info->nr_theirs; i++) {
464 if (i != dst)
465 info->theirs[dst] = info->theirs[i];
466 if (has_object_file(oid + info->theirs[i]))
467 dst++;
468 }
469 info->nr_theirs = dst;
470 }
471
472 define_commit_slab(ref_bitmap, uint32_t *);
473
474 #define POOL_SIZE (512 * 1024)
475
476 struct paint_info {
477 struct ref_bitmap ref_bitmap;
478 unsigned nr_bits;
479 char **pools;
480 char *free, *end;
481 unsigned pool_count;
482 };
483
484 static uint32_t *paint_alloc(struct paint_info *info)
485 {
486 unsigned nr = DIV_ROUND_UP(info->nr_bits, 32);
487 unsigned size = nr * sizeof(uint32_t);
488 void *p;
489 if (!info->pool_count || size > info->end - info->free) {
490 if (size > POOL_SIZE)
491 BUG("pool size too small for %d in paint_alloc()",
492 size);
493 info->pool_count++;
494 REALLOC_ARRAY(info->pools, info->pool_count);
495 info->free = xmalloc(POOL_SIZE);
496 info->pools[info->pool_count - 1] = info->free;
497 info->end = info->free + POOL_SIZE;
498 }
499 p = info->free;
500 info->free += size;
501 return p;
502 }
503
504 /*
505 * Given a commit SHA-1, walk down to parents until either SEEN,
506 * UNINTERESTING or BOTTOM is hit. Set the id-th bit in ref_bitmap for
507 * all walked commits.
508 */
509 static void paint_down(struct paint_info *info, const struct object_id *oid,
510 unsigned int id)
511 {
512 unsigned int i, nr;
513 struct commit_list *head = NULL;
514 int bitmap_nr = DIV_ROUND_UP(info->nr_bits, 32);
515 size_t bitmap_size = st_mult(sizeof(uint32_t), bitmap_nr);
516 struct commit *c = lookup_commit_reference_gently(the_repository, oid,
517 1);
518 uint32_t *tmp; /* to be freed before return */
519 uint32_t *bitmap;
520
521 if (!c)
522 return;
523
524 tmp = xmalloc(bitmap_size);
525 bitmap = paint_alloc(info);
526 memset(bitmap, 0, bitmap_size);
527 bitmap[id / 32] |= (1U << (id % 32));
528 commit_list_insert(c, &head);
529 while (head) {
530 struct commit_list *p;
531 struct commit *c = pop_commit(&head);
532 uint32_t **refs = ref_bitmap_at(&info->ref_bitmap, c);
533
534 /* XXX check "UNINTERESTING" from pack bitmaps if available */
535 if (c->object.flags & (SEEN | UNINTERESTING))
536 continue;
537 else
538 c->object.flags |= SEEN;
539
540 if (*refs == NULL)
541 *refs = bitmap;
542 else {
543 memcpy(tmp, *refs, bitmap_size);
544 for (i = 0; i < bitmap_nr; i++)
545 tmp[i] |= bitmap[i];
546 if (memcmp(tmp, *refs, bitmap_size)) {
547 *refs = paint_alloc(info);
548 memcpy(*refs, tmp, bitmap_size);
549 }
550 }
551
552 if (c->object.flags & BOTTOM)
553 continue;
554
555 if (parse_commit(c))
556 die("unable to parse commit %s",
557 oid_to_hex(&c->object.oid));
558
559 for (p = c->parents; p; p = p->next) {
560 if (p->item->object.flags & SEEN)
561 continue;
562 commit_list_insert(p->item, &head);
563 }
564 }
565
566 nr = get_max_object_index();
567 for (i = 0; i < nr; i++) {
568 struct object *o = get_indexed_object(i);
569 if (o && o->type == OBJ_COMMIT)
570 o->flags &= ~SEEN;
571 }
572
573 free(tmp);
574 }
575
576 static int mark_uninteresting(const char *refname, const struct object_id *oid,
577 int flags, void *cb_data)
578 {
579 struct commit *commit = lookup_commit_reference_gently(the_repository,
580 oid, 1);
581 if (!commit)
582 return 0;
583 commit->object.flags |= UNINTERESTING;
584 mark_parents_uninteresting(commit);
585 return 0;
586 }
587
588 static void post_assign_shallow(struct shallow_info *info,
589 struct ref_bitmap *ref_bitmap,
590 int *ref_status);
591 /*
592 * Step 6(+7), associate shallow commits with new refs
593 *
594 * info->ref must be initialized before calling this function.
595 *
596 * If used is not NULL, it's an array of info->shallow->nr
597 * bitmaps. The n-th bit set in the m-th bitmap if ref[n] needs the
598 * m-th shallow commit from info->shallow.
599 *
600 * If used is NULL, "ours" and "theirs" are updated. And if ref_status
601 * is not NULL it's an array of ref->nr ints. ref_status[i] is true if
602 * the ref needs some shallow commits from either info->ours or
603 * info->theirs.
604 */
605 void assign_shallow_commits_to_refs(struct shallow_info *info,
606 uint32_t **used, int *ref_status)
607 {
608 struct object_id *oid = info->shallow->oid;
609 struct oid_array *ref = info->ref;
610 unsigned int i, nr;
611 int *shallow, nr_shallow = 0;
612 struct paint_info pi;
613
614 trace_printf_key(&trace_shallow, "shallow: assign_shallow_commits_to_refs\n");
615 ALLOC_ARRAY(shallow, info->nr_ours + info->nr_theirs);
616 for (i = 0; i < info->nr_ours; i++)
617 shallow[nr_shallow++] = info->ours[i];
618 for (i = 0; i < info->nr_theirs; i++)
619 shallow[nr_shallow++] = info->theirs[i];
620
621 /*
622 * Prepare the commit graph to track what refs can reach what
623 * (new) shallow commits.
624 */
625 nr = get_max_object_index();
626 for (i = 0; i < nr; i++) {
627 struct object *o = get_indexed_object(i);
628 if (!o || o->type != OBJ_COMMIT)
629 continue;
630
631 o->flags &= ~(UNINTERESTING | BOTTOM | SEEN);
632 }
633
634 memset(&pi, 0, sizeof(pi));
635 init_ref_bitmap(&pi.ref_bitmap);
636 pi.nr_bits = ref->nr;
637
638 /*
639 * "--not --all" to cut short the traversal if new refs
640 * connect to old refs. If not (e.g. force ref updates) it'll
641 * have to go down to the current shallow commits.
642 */
643 head_ref(mark_uninteresting, NULL);
644 for_each_ref(mark_uninteresting, NULL);
645
646 /* Mark potential bottoms so we won't go out of bound */
647 for (i = 0; i < nr_shallow; i++) {
648 struct commit *c = lookup_commit(the_repository,
649 &oid[shallow[i]]);
650 c->object.flags |= BOTTOM;
651 }
652
653 for (i = 0; i < ref->nr; i++)
654 paint_down(&pi, ref->oid + i, i);
655
656 if (used) {
657 int bitmap_size = DIV_ROUND_UP(pi.nr_bits, 32) * sizeof(uint32_t);
658 memset(used, 0, sizeof(*used) * info->shallow->nr);
659 for (i = 0; i < nr_shallow; i++) {
660 const struct commit *c = lookup_commit(the_repository,
661 &oid[shallow[i]]);
662 uint32_t **map = ref_bitmap_at(&pi.ref_bitmap, c);
663 if (*map)
664 used[shallow[i]] = xmemdupz(*map, bitmap_size);
665 }
666 /*
667 * unreachable shallow commits are not removed from
668 * "ours" and "theirs". The user is supposed to run
669 * step 7 on every ref separately and not trust "ours"
670 * and "theirs" any more.
671 */
672 } else
673 post_assign_shallow(info, &pi.ref_bitmap, ref_status);
674
675 clear_ref_bitmap(&pi.ref_bitmap);
676 for (i = 0; i < pi.pool_count; i++)
677 free(pi.pools[i]);
678 free(pi.pools);
679 free(shallow);
680 }
681
682 struct commit_array {
683 struct commit **commits;
684 int nr, alloc;
685 };
686
687 static int add_ref(const char *refname, const struct object_id *oid,
688 int flags, void *cb_data)
689 {
690 struct commit_array *ca = cb_data;
691 ALLOC_GROW(ca->commits, ca->nr + 1, ca->alloc);
692 ca->commits[ca->nr] = lookup_commit_reference_gently(the_repository,
693 oid, 1);
694 if (ca->commits[ca->nr])
695 ca->nr++;
696 return 0;
697 }
698
699 static void update_refstatus(int *ref_status, int nr, uint32_t *bitmap)
700 {
701 unsigned int i;
702 if (!ref_status)
703 return;
704 for (i = 0; i < nr; i++)
705 if (bitmap[i / 32] & (1U << (i % 32)))
706 ref_status[i]++;
707 }
708
709 /*
710 * Step 7, reachability test on "ours" at commit level
711 */
712 static void post_assign_shallow(struct shallow_info *info,
713 struct ref_bitmap *ref_bitmap,
714 int *ref_status)
715 {
716 struct object_id *oid = info->shallow->oid;
717 struct commit *c;
718 uint32_t **bitmap;
719 int dst, i, j;
720 int bitmap_nr = DIV_ROUND_UP(info->ref->nr, 32);
721 struct commit_array ca;
722
723 trace_printf_key(&trace_shallow, "shallow: post_assign_shallow\n");
724 if (ref_status)
725 memset(ref_status, 0, sizeof(*ref_status) * info->ref->nr);
726
727 /* Remove unreachable shallow commits from "theirs" */
728 for (i = dst = 0; i < info->nr_theirs; i++) {
729 if (i != dst)
730 info->theirs[dst] = info->theirs[i];
731 c = lookup_commit(the_repository, &oid[info->theirs[i]]);
732 bitmap = ref_bitmap_at(ref_bitmap, c);
733 if (!*bitmap)
734 continue;
735 for (j = 0; j < bitmap_nr; j++)
736 if (bitmap[0][j]) {
737 update_refstatus(ref_status, info->ref->nr, *bitmap);
738 dst++;
739 break;
740 }
741 }
742 info->nr_theirs = dst;
743
744 memset(&ca, 0, sizeof(ca));
745 head_ref(add_ref, &ca);
746 for_each_ref(add_ref, &ca);
747
748 /* Remove unreachable shallow commits from "ours" */
749 for (i = dst = 0; i < info->nr_ours; i++) {
750 if (i != dst)
751 info->ours[dst] = info->ours[i];
752 c = lookup_commit(the_repository, &oid[info->ours[i]]);
753 bitmap = ref_bitmap_at(ref_bitmap, c);
754 if (!*bitmap)
755 continue;
756 for (j = 0; j < bitmap_nr; j++)
757 if (bitmap[0][j] &&
758 /* Step 7, reachability test at commit level */
759 !in_merge_bases_many(c, ca.nr, ca.commits)) {
760 update_refstatus(ref_status, info->ref->nr, *bitmap);
761 dst++;
762 break;
763 }
764 }
765 info->nr_ours = dst;
766
767 free(ca.commits);
768 }
769
770 /* (Delayed) step 7, reachability test at commit level */
771 int delayed_reachability_test(struct shallow_info *si, int c)
772 {
773 if (si->need_reachability_test[c]) {
774 struct commit *commit = lookup_commit(the_repository,
775 &si->shallow->oid[c]);
776
777 if (!si->commits) {
778 struct commit_array ca;
779
780 memset(&ca, 0, sizeof(ca));
781 head_ref(add_ref, &ca);
782 for_each_ref(add_ref, &ca);
783 si->commits = ca.commits;
784 si->nr_commits = ca.nr;
785 }
786
787 si->reachable[c] = in_merge_bases_many(commit,
788 si->nr_commits,
789 si->commits);
790 si->need_reachability_test[c] = 0;
791 }
792 return si->reachable[c];
793 }