shallow: add repository argument to register_shallow
[git/git.git] / shallow.c
CommitLineData
ed09aef0 1#include "cache.h"
3f5787f8 2#include "repository.h"
6e122b44 3#include "tempfile.h"
697cc8ef 4#include "lockfile.h"
cbd53a21 5#include "object-store.h"
ed09aef0 6#include "commit.h"
abef3a16 7#include "tag.h"
3125fe52 8#include "pkt-line.h"
58babfff
NTND
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"
3d9ff4d7
NTND
15#include "revision.h"
16#include "list-objects.h"
ed09aef0
JS
17
18static int is_shallow = -1;
0cc77c38 19static struct stat_validity shallow_stat;
6035d6aa
NTND
20static char *alternate_shallow_file;
21
6a2df51c 22void set_alternate_shallow_file_the_repository(const char *path, int override)
6035d6aa
NTND
23{
24 if (is_shallow != -1)
25 die("BUG: is_repository_shallow must not be called before set_alternate_shallow_file");
069c0532
NTND
26 if (alternate_shallow_file && !override)
27 return;
6035d6aa 28 free(alternate_shallow_file);
8c53f071 29 alternate_shallow_file = xstrdup_or_null(path);
6035d6aa 30}
ed09aef0 31
19143f13 32int register_shallow_the_repository(const struct object_id *oid)
ed09aef0
JS
33{
34 struct commit_graft *graft =
35 xmalloc(sizeof(struct commit_graft));
bc83266a 36 struct commit *commit = lookup_commit(oid);
ed09aef0 37
e92b848c 38 oidcpy(&graft->oid, oid);
ed09aef0
JS
39 graft->nr_parent = -1;
40 if (commit && commit->object.parsed)
41 commit->parents = NULL;
3f5787f8 42 return register_commit_graft(the_repository, graft, 0);
ed09aef0
JS
43}
44
f43117a6 45int is_repository_shallow(void)
ed09aef0
JS
46{
47 FILE *fp;
48 char buf[1024];
6035d6aa 49 const char *path = alternate_shallow_file;
ed09aef0
JS
50
51 if (is_shallow >= 0)
52 return is_shallow;
53
6035d6aa 54 if (!path)
f932729c 55 path = git_path_shallow();
6035d6aa
NTND
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 */
0cc77c38
JK
61 if (!*path || (fp = fopen(path, "r")) == NULL) {
62 stat_validity_clear(&shallow_stat);
ed09aef0
JS
63 is_shallow = 0;
64 return is_shallow;
65 }
0cc77c38 66 stat_validity_update(&shallow_stat, fileno(fp));
ed09aef0
JS
67 is_shallow = 1;
68
69 while (fgets(buf, sizeof(buf), fp)) {
e92b848c 70 struct object_id oid;
71 if (get_oid_hex(buf, &oid))
ed09aef0 72 die("bad shallow line: %s", buf);
19143f13 73 register_shallow(the_repository, &oid);
ed09aef0
JS
74 }
75 fclose(fp);
76 return is_shallow;
77}
78
f53514bc
JS
79struct commit_list *get_shallow_commits(struct object_array *heads, int depth,
80 int shallow_flag, int not_shallow_flag)
ed09aef0
JS
81{
82 int i = 0, cur_depth = 0;
83 struct commit_list *result = NULL;
3cd47459 84 struct object_array stack = OBJECT_ARRAY_INIT;
ed09aef0 85 struct commit *commit = NULL;
79d3a236 86 struct commit_graft *graft;
ed09aef0
JS
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 *)
abef3a16 93 deref_tag(heads->objects[i++].item, NULL, 0);
affeef12 94 if (!commit || commit->object.type != OBJ_COMMIT) {
ed09aef0
JS
95 commit = NULL;
96 continue;
97 }
d64d6c9f
AJ
98 if (!commit->util)
99 commit->util = xmalloc(sizeof(int));
100 *(int *)commit->util = 0;
ed09aef0
JS
101 cur_depth = 0;
102 } else {
103 commit = (struct commit *)
71992039 104 object_array_pop(&stack);
ed09aef0
JS
105 cur_depth = *(int *)commit->util;
106 }
107 }
367068e0 108 parse_commit_or_die(commit);
ed09aef0 109 cur_depth++;
79d3a236
NTND
110 if ((depth != INFINITE_DEPTH && cur_depth >= depth) ||
111 (is_repository_shallow() && !commit->parents &&
1f93ecd1 112 (graft = lookup_commit_graft(the_repository, &commit->object.oid)) != NULL &&
79d3a236 113 graft->nr_parent < 0)) {
682c7d2f
NTND
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;
ed09aef0
JS
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 }
4b796951
MK
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;
f53514bc 137 }
ed09aef0
JS
138 }
139 }
140
141 return result;
142}
6035d6aa 143
3d9ff4d7
NTND
144static 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 */
155struct 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
167832c2 220static void check_shallow_file_for_update(void)
6035d6aa 221{
0cc77c38 222 if (is_shallow == -1)
6035d6aa
NTND
223 die("BUG: shallow must be initialized by now");
224
f932729c 225 if (!stat_validity_check(&shallow_stat, git_path_shallow()))
0cc77c38 226 die("shallow file has changed since we read it");
6035d6aa 227}
3125fe52 228
eab3296c
NTND
229#define SEEN_ONLY 1
230#define VERBOSE 2
231
3125fe52
NTND
232struct write_shallow_data {
233 struct strbuf *out;
234 int use_pack_protocol;
235 int count;
eab3296c 236 unsigned flags;
3125fe52
NTND
237};
238
239static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
240{
241 struct write_shallow_data *data = cb_data;
7683e2e6 242 const char *hex = oid_to_hex(&graft->oid);
6a3bbb4d
NTND
243 if (graft->nr_parent != -1)
244 return 0;
eab3296c 245 if (data->flags & SEEN_ONLY) {
bc83266a 246 struct commit *c = lookup_commit(&graft->oid);
eab3296c
NTND
247 if (!c || !(c->object.flags & SEEN)) {
248 if (data->flags & VERBOSE)
249 printf("Removing %s from .git/shallow\n",
f2fd0760 250 oid_to_hex(&c->object.oid));
eab3296c
NTND
251 return 0;
252 }
253 }
3125fe52
NTND
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
eab3296c 264static int write_shallow_commits_1(struct strbuf *out, int use_pack_protocol,
910650d2 265 const struct oid_array *extra,
eab3296c 266 unsigned flags)
3125fe52
NTND
267{
268 struct write_shallow_data data;
1a30f5a2 269 int i;
3125fe52
NTND
270 data.out = out;
271 data.use_pack_protocol = use_pack_protocol;
272 data.count = 0;
eab3296c 273 data.flags = flags;
3125fe52 274 for_each_commit_graft(write_one_shallow, &data);
1a30f5a2
NTND
275 if (!extra)
276 return data.count;
277 for (i = 0; i < extra->nr; i++) {
ee3051bd 278 strbuf_addstr(out, oid_to_hex(extra->oid + i));
1a30f5a2
NTND
279 strbuf_addch(out, '\n');
280 data.count++;
281 }
3125fe52
NTND
282 return data.count;
283}
284
eab3296c 285int write_shallow_commits(struct strbuf *out, int use_pack_protocol,
910650d2 286 const struct oid_array *extra)
eab3296c
NTND
287{
288 return write_shallow_commits_1(out, use_pack_protocol, extra, 0);
289}
290
910650d2 291const char *setup_temporary_shallow(const struct oid_array *extra)
08ea65ad 292{
076aa2cb 293 struct tempfile *temp;
08ea65ad 294 struct strbuf sb = STRBUF_INIT;
08ea65ad 295
1a30f5a2 296 if (write_shallow_commits(&sb, 0, extra)) {
076aa2cb 297 temp = xmks_tempfile(git_path("shallow_XXXXXX"));
0179c945 298
c50424a6 299 if (write_in_full(temp->fd, sb.buf, sb.len) < 0 ||
076aa2cb 300 close_tempfile_gently(temp) < 0)
08ea65ad 301 die_errno("failed to write to %s",
076aa2cb 302 get_tempfile_path(temp));
08ea65ad 303 strbuf_release(&sb);
076aa2cb 304 return get_tempfile_path(temp);
08ea65ad
NTND
305 }
306 /*
307 * is_repository_shallow() sees empty string as "no shallow
308 * file".
309 */
08990139 310 return "";
08ea65ad
NTND
311}
312
3125fe52 313void setup_alternate_shallow(struct lock_file *shallow_lock,
1a30f5a2 314 const char **alternate_shallow_file,
910650d2 315 const struct oid_array *extra)
3125fe52
NTND
316{
317 struct strbuf sb = STRBUF_INIT;
318 int fd;
319
f932729c 320 fd = hold_lock_file_for_update(shallow_lock, git_path_shallow(),
3125fe52 321 LOCK_DIE_ON_ERROR);
78396321 322 check_shallow_file_for_update();
1a30f5a2 323 if (write_shallow_commits(&sb, 0, extra)) {
06f46f23 324 if (write_in_full(fd, sb.buf, sb.len) < 0)
3125fe52 325 die_errno("failed to write to %s",
b4fb09e4
MH
326 get_lock_file_path(shallow_lock));
327 *alternate_shallow_file = get_lock_file_path(shallow_lock);
3125fe52
NTND
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}
ad491366
NTND
336
337static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
338{
339 int fd = *(int *)cb;
340 if (graft->nr_parent == -1)
81c634e9 341 packet_write_fmt(fd, "shallow %s\n", oid_to_hex(&graft->oid));
ad491366
NTND
342 return 0;
343}
344
345void advertise_shallow_grafts(int fd)
346{
347 if (!is_repository_shallow())
348 return;
349 for_each_commit_graft(advertise_shallow_grafts_cb, &fd);
350}
58babfff 351
eab3296c
NTND
352/*
353 * mark_reachable_objects() should have been run prior to this and all
354 * reachable commits marked as "SEEN".
355 */
356void 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 }
f932729c 367 fd = hold_lock_file_for_update(&shallow_lock, git_path_shallow(),
eab3296c 368 LOCK_DIE_ON_ERROR);
78396321 369 check_shallow_file_for_update();
eab3296c 370 if (write_shallow_commits_1(&sb, 0, NULL, SEEN_ONLY)) {
06f46f23 371 if (write_in_full(fd, sb.buf, sb.len) < 0)
eab3296c 372 die_errno("failed to write to %s",
b4fb09e4 373 get_lock_file_path(&shallow_lock));
eab3296c
NTND
374 commit_lock_file(&shallow_lock);
375 } else {
f932729c 376 unlink(git_path_shallow());
eab3296c
NTND
377 rollback_lock_file(&shallow_lock);
378 }
379 strbuf_release(&sb);
380}
381
6aa30857 382struct trace_key trace_shallow = TRACE_KEY_INIT(SHALLOW);
58babfff
NTND
383
384/*
385 * Step 1, split sender shallow commits into "ours" and "theirs"
386 * Step 2, clean "ours" based on .git/shallow
387 */
910650d2 388void prepare_shallow_info(struct shallow_info *info, struct oid_array *sa)
58babfff
NTND
389{
390 int i;
6aa30857 391 trace_printf_key(&trace_shallow, "shallow: prepare_shallow_info\n");
58babfff
NTND
392 memset(info, 0, sizeof(*info));
393 info->shallow = sa;
394 if (!sa)
395 return;
b32fa95f
JK
396 ALLOC_ARRAY(info->ours, sa->nr);
397 ALLOC_ARRAY(info->theirs, sa->nr);
58babfff 398 for (i = 0; i < sa->nr; i++) {
ee3051bd 399 if (has_object_file(sa->oid + i)) {
58babfff 400 struct commit_graft *graft;
1f93ecd1
JN
401 graft = lookup_commit_graft(the_repository,
402 &sa->oid[i]);
58babfff
NTND
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
411void 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
419void remove_nonexistent_theirs_shallow(struct shallow_info *info)
420{
ee3051bd 421 struct object_id *oid = info->shallow->oid;
58babfff 422 int i, dst;
6aa30857 423 trace_printf_key(&trace_shallow, "shallow: remove_nonexistent_theirs_shallow\n");
58babfff
NTND
424 for (i = dst = 0; i < info->nr_theirs; i++) {
425 if (i != dst)
426 info->theirs[dst] = info->theirs[i];
ee3051bd 427 if (has_object_file(oid + info->theirs[i]))
58babfff
NTND
428 dst++;
429 }
430 info->nr_theirs = dst;
431}
432
8e277383
NTND
433define_commit_slab(ref_bitmap, uint32_t *);
434
6bc3d8c5
NTND
435#define POOL_SIZE (512 * 1024)
436
8e277383
NTND
437struct paint_info {
438 struct ref_bitmap ref_bitmap;
439 unsigned nr_bits;
0afd307a 440 char **pools;
8e277383 441 char *free, *end;
0afd307a 442 unsigned pool_count;
8e277383
NTND
443};
444
445static uint32_t *paint_alloc(struct paint_info *info)
446{
42c78a21 447 unsigned nr = DIV_ROUND_UP(info->nr_bits, 32);
8e277383
NTND
448 unsigned size = nr * sizeof(uint32_t);
449 void *p;
381aa8e7 450 if (!info->pool_count || size > info->end - info->free) {
f2386c6b
NTND
451 if (size > POOL_SIZE)
452 die("BUG: pool size too small for %d in paint_alloc()",
453 size);
0afd307a
NTND
454 info->pool_count++;
455 REALLOC_ARRAY(info->pools, info->pool_count);
6bc3d8c5 456 info->free = xmalloc(POOL_SIZE);
0afd307a 457 info->pools[info->pool_count - 1] = info->free;
6bc3d8c5 458 info->end = info->free + POOL_SIZE;
8e277383
NTND
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 */
1e43ed98 470static void paint_down(struct paint_info *info, const struct object_id *oid,
1127b3ce 471 unsigned int id)
8e277383
NTND
472{
473 unsigned int i, nr;
474 struct commit_list *head = NULL;
42c78a21 475 int bitmap_nr = DIV_ROUND_UP(info->nr_bits, 32);
50492f7b 476 size_t bitmap_size = st_mult(sizeof(uint32_t), bitmap_nr);
bc83266a 477 struct commit *c = lookup_commit_reference_gently(oid, 1);
7c565a6b
JS
478 uint32_t *tmp; /* to be freed before return */
479 uint32_t *bitmap;
480
8e277383
NTND
481 if (!c)
482 return;
7c565a6b
JS
483
484 tmp = xmalloc(bitmap_size);
485 bitmap = paint_alloc(info);
8e277383 486 memset(bitmap, 0, bitmap_size);
1127b3ce 487 bitmap[id / 32] |= (1U << (id % 32));
8e277383
NTND
488 commit_list_insert(c, &head);
489 while (head) {
490 struct commit_list *p;
e510ab89 491 struct commit *c = pop_commit(&head);
8e277383
NTND
492 uint32_t **refs = ref_bitmap_at(&info->ref_bitmap, c);
493
8e277383
NTND
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",
f2fd0760 517 oid_to_hex(&c->object.oid));
8e277383
NTND
518
519 for (p = c->parents; p; p = p->next) {
8e277383
NTND
520 if (p->item->object.flags & SEEN)
521 continue;
8e277383
NTND
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
580b04ef 536static int mark_uninteresting(const char *refname, const struct object_id *oid,
8e277383
NTND
537 int flags, void *cb_data)
538{
bc83266a 539 struct commit *commit = lookup_commit_reference_gently(oid, 1);
8e277383
NTND
540 if (!commit)
541 return 0;
542 commit->object.flags |= UNINTERESTING;
543 mark_parents_uninteresting(commit);
544 return 0;
545}
546
547static 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 */
564void assign_shallow_commits_to_refs(struct shallow_info *info,
565 uint32_t **used, int *ref_status)
566{
ee3051bd 567 struct object_id *oid = info->shallow->oid;
910650d2 568 struct oid_array *ref = info->ref;
8e277383
NTND
569 unsigned int i, nr;
570 int *shallow, nr_shallow = 0;
571 struct paint_info pi;
572
6aa30857 573 trace_printf_key(&trace_shallow, "shallow: assign_shallow_commits_to_refs\n");
b32fa95f 574 ALLOC_ARRAY(shallow, info->nr_ours + info->nr_theirs);
8e277383
NTND
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 */
580b04ef
MH
602 head_ref(mark_uninteresting, NULL);
603 for_each_ref(mark_uninteresting, NULL);
8e277383
NTND
604
605 /* Mark potential bottoms so we won't go out of bound */
606 for (i = 0; i < nr_shallow; i++) {
bc83266a 607 struct commit *c = lookup_commit(&oid[shallow[i]]);
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NTND
608 c->object.flags |= BOTTOM;
609 }
610
611 for (i = 0; i < ref->nr; i++)
1e43ed98 612 paint_down(&pi, ref->oid + i, i);
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NTND
613
614 if (used) {
42c78a21 615 int bitmap_size = DIV_ROUND_UP(pi.nr_bits, 32) * sizeof(uint32_t);
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NTND
616 memset(used, 0, sizeof(*used) * info->shallow->nr);
617 for (i = 0; i < nr_shallow; i++) {
bc83266a 618 const struct commit *c = lookup_commit(&oid[shallow[i]]);
8e277383
NTND
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);
0afd307a
NTND
633 for (i = 0; i < pi.pool_count; i++)
634 free(pi.pools[i]);
635 free(pi.pools);
8e277383
NTND
636 free(shallow);
637}
638
639struct commit_array {
640 struct commit **commits;
641 int nr, alloc;
642};
643
580b04ef
MH
644static int add_ref(const char *refname, const struct object_id *oid,
645 int flags, void *cb_data)
8e277383
NTND
646{
647 struct commit_array *ca = cb_data;
648 ALLOC_GROW(ca->commits, ca->nr + 1, ca->alloc);
bc83266a 649 ca->commits[ca->nr] = lookup_commit_reference_gently(oid, 1);
8e277383
NTND
650 if (ca->commits[ca->nr])
651 ca->nr++;
652 return 0;
653}
654
655static void update_refstatus(int *ref_status, int nr, uint32_t *bitmap)
656{
1127b3ce 657 unsigned int i;
8e277383
NTND
658 if (!ref_status)
659 return;
660 for (i = 0; i < nr; i++)
1127b3ce 661 if (bitmap[i / 32] & (1U << (i % 32)))
8e277383
NTND
662 ref_status[i]++;
663}
664
665/*
666 * Step 7, reachability test on "ours" at commit level
667 */
668static void post_assign_shallow(struct shallow_info *info,
669 struct ref_bitmap *ref_bitmap,
670 int *ref_status)
671{
ee3051bd 672 struct object_id *oid = info->shallow->oid;
8e277383
NTND
673 struct commit *c;
674 uint32_t **bitmap;
675 int dst, i, j;
42c78a21 676 int bitmap_nr = DIV_ROUND_UP(info->ref->nr, 32);
8e277383
NTND
677 struct commit_array ca;
678
6aa30857 679 trace_printf_key(&trace_shallow, "shallow: post_assign_shallow\n");
8e277383
NTND
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];
bc83266a 687 c = lookup_commit(&oid[info->theirs[i]]);
8e277383
NTND
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));
580b04ef
MH
701 head_ref(add_ref, &ca);
702 for_each_ref(add_ref, &ca);
8e277383
NTND
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];
bc83266a 708 c = lookup_commit(&oid[info->ours[i]]);
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NTND
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}
0a1bc12b
NTND
725
726/* (Delayed) step 7, reachability test at commit level */
727int delayed_reachability_test(struct shallow_info *si, int c)
728{
729 if (si->need_reachability_test[c]) {
bc83266a 730 struct commit *commit = lookup_commit(&si->shallow->oid[c]);
0a1bc12b
NTND
731
732 if (!si->commits) {
733 struct commit_array ca;
2b2a5be3 734
0a1bc12b 735 memset(&ca, 0, sizeof(ca));
580b04ef
MH
736 head_ref(add_ref, &ca);
737 for_each_ref(add_ref, &ca);
0a1bc12b
NTND
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}