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