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