Merge branch 'dl/compat-cleanup'
[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"
58dbe58f 17#include "commit-slab.h"
eee4502b 18#include "repository.h"
64043556 19#include "commit-reach.h"
ed09aef0 20
eee4502b 21void set_alternate_shallow_file(struct repository *r, const char *path, int override)
6035d6aa 22{
eee4502b 23 if (r->parsed_objects->is_shallow != -1)
033abf97 24 BUG("is_repository_shallow must not be called before set_alternate_shallow_file");
eee4502b 25 if (r->parsed_objects->alternate_shallow_file && !override)
069c0532 26 return;
eee4502b
SB
27 free(r->parsed_objects->alternate_shallow_file);
28 r->parsed_objects->alternate_shallow_file = xstrdup_or_null(path);
6035d6aa 29}
ed09aef0 30
eee4502b 31int register_shallow(struct repository *r, const struct object_id *oid)
ed09aef0
JS
32{
33 struct commit_graft *graft =
34 xmalloc(sizeof(struct commit_graft));
c1f5eb49 35 struct commit *commit = lookup_commit(the_repository, oid);
ed09aef0 36
e92b848c 37 oidcpy(&graft->oid, oid);
ed09aef0
JS
38 graft->nr_parent = -1;
39 if (commit && commit->object.parsed)
40 commit->parents = NULL;
eee4502b 41 return register_commit_graft(r, graft, 0);
ed09aef0
JS
42}
43
eee4502b 44int is_repository_shallow(struct repository *r)
ed09aef0 45{
bd0b42ae
JT
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
ed09aef0
JS
53 FILE *fp;
54 char buf[1024];
eee4502b 55 const char *path = r->parsed_objects->alternate_shallow_file;
ed09aef0 56
eee4502b
SB
57 if (r->parsed_objects->is_shallow >= 0)
58 return r->parsed_objects->is_shallow;
ed09aef0 59
6035d6aa 60 if (!path)
eee4502b 61 path = git_path_shallow(r);
6035d6aa
NTND
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 */
0cc77c38 67 if (!*path || (fp = fopen(path, "r")) == NULL) {
eee4502b
SB
68 stat_validity_clear(r->parsed_objects->shallow_stat);
69 r->parsed_objects->is_shallow = 0;
70 return r->parsed_objects->is_shallow;
ed09aef0 71 }
eee4502b
SB
72 stat_validity_update(r->parsed_objects->shallow_stat, fileno(fp));
73 r->parsed_objects->is_shallow = 1;
ed09aef0
JS
74
75 while (fgets(buf, sizeof(buf), fp)) {
e92b848c 76 struct object_id oid;
77 if (get_oid_hex(buf, &oid))
ed09aef0 78 die("bad shallow line: %s", buf);
eee4502b 79 register_shallow(r, &oid);
ed09aef0
JS
80 }
81 fclose(fp);
eee4502b 82 return r->parsed_objects->is_shallow;
ed09aef0
JS
83}
84
58dbe58f
NTND
85/*
86 * TODO: use "int" elemtype instead of "int *" when/if commit-slab
87 * supports a "valid" flag.
88 */
89define_commit_slab(commit_depth, int *);
f53514bc
JS
90struct commit_list *get_shallow_commits(struct object_array *heads, int depth,
91 int shallow_flag, int not_shallow_flag)
ed09aef0
JS
92{
93 int i = 0, cur_depth = 0;
94 struct commit_list *result = NULL;
3cd47459 95 struct object_array stack = OBJECT_ARRAY_INIT;
ed09aef0 96 struct commit *commit = NULL;
79d3a236 97 struct commit_graft *graft;
58dbe58f 98 struct commit_depth depths;
ed09aef0 99
58dbe58f 100 init_commit_depth(&depths);
ed09aef0
JS
101 while (commit || i < heads->nr || stack.nr) {
102 struct commit_list *p;
103 if (!commit) {
104 if (i < heads->nr) {
58dbe58f 105 int **depth_slot;
ed09aef0 106 commit = (struct commit *)
a74093da
SB
107 deref_tag(the_repository,
108 heads->objects[i++].item,
109 NULL, 0);
affeef12 110 if (!commit || commit->object.type != OBJ_COMMIT) {
ed09aef0
JS
111 commit = NULL;
112 continue;
113 }
58dbe58f
NTND
114 depth_slot = commit_depth_at(&depths, commit);
115 if (!*depth_slot)
116 *depth_slot = xmalloc(sizeof(int));
117 **depth_slot = 0;
ed09aef0
JS
118 cur_depth = 0;
119 } else {
120 commit = (struct commit *)
71992039 121 object_array_pop(&stack);
58dbe58f 122 cur_depth = **commit_depth_at(&depths, commit);
ed09aef0
JS
123 }
124 }
367068e0 125 parse_commit_or_die(commit);
ed09aef0 126 cur_depth++;
79d3a236 127 if ((depth != INFINITE_DEPTH && cur_depth >= depth) ||
c8813487 128 (is_repository_shallow(the_repository) && !commit->parents &&
1f93ecd1 129 (graft = lookup_commit_graft(the_repository, &commit->object.oid)) != NULL &&
79d3a236 130 graft->nr_parent < 0)) {
682c7d2f
NTND
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;
ed09aef0 137 for (p = commit->parents, commit = NULL; p; p = p->next) {
58dbe58f
NTND
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;
ed09aef0 142 } else {
58dbe58f 143 if (cur_depth >= **depth_slot)
ed09aef0 144 continue;
58dbe58f 145 **depth_slot = cur_depth;
ed09aef0 146 }
4b796951
MK
147 if (p->next)
148 add_object_array(&p->item->object,
149 NULL, &stack);
150 else {
151 commit = p->item;
58dbe58f 152 cur_depth = **commit_depth_at(&depths, commit);
f53514bc 153 }
ed09aef0
JS
154 }
155 }
58dbe58f
NTND
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);
ed09aef0
JS
163
164 return result;
165}
6035d6aa 166
3d9ff4d7
NTND
167static 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 */
178struct 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
c8813487 193 is_repository_shallow(the_repository); /* make sure shallows are read */
3d9ff4d7 194
2abf3503 195 repo_init_revisions(the_repository, &revs, NULL);
3d9ff4d7
NTND
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
e34de73c
NTND
203 if (!not_shallow_list)
204 die("no commits selected for shallow requests");
205
3d9ff4d7
NTND
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
eee4502b 246static void check_shallow_file_for_update(struct repository *r)
6035d6aa 247{
eee4502b 248 if (r->parsed_objects->is_shallow == -1)
033abf97 249 BUG("shallow must be initialized by now");
6035d6aa 250
34e7771b
NTND
251 if (!stat_validity_check(r->parsed_objects->shallow_stat,
252 git_path_shallow(r)))
0cc77c38 253 die("shallow file has changed since we read it");
6035d6aa 254}
3125fe52 255
eab3296c
NTND
256#define SEEN_ONLY 1
257#define VERBOSE 2
2588f6ed 258#define QUICK 4
eab3296c 259
3125fe52
NTND
260struct write_shallow_data {
261 struct strbuf *out;
262 int use_pack_protocol;
263 int count;
eab3296c 264 unsigned flags;
3125fe52
NTND
265};
266
267static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
268{
269 struct write_shallow_data *data = cb_data;
7683e2e6 270 const char *hex = oid_to_hex(&graft->oid);
6a3bbb4d
NTND
271 if (graft->nr_parent != -1)
272 return 0;
2588f6ed
JS
273 if (data->flags & QUICK) {
274 if (!has_object_file(&graft->oid))
275 return 0;
276 } else if (data->flags & SEEN_ONLY) {
c1f5eb49 277 struct commit *c = lookup_commit(the_repository, &graft->oid);
eab3296c
NTND
278 if (!c || !(c->object.flags & SEEN)) {
279 if (data->flags & VERBOSE)
280 printf("Removing %s from .git/shallow\n",
f2fd0760 281 oid_to_hex(&c->object.oid));
eab3296c
NTND
282 return 0;
283 }
284 }
3125fe52
NTND
285 data->count++;
286 if (data->use_pack_protocol)
287 packet_buf_write(data->out, "shallow %s", hex);
288 else {
289 strbuf_addstr(data->out, hex);
290 strbuf_addch(data->out, '\n');
291 }
292 return 0;
293}
294
eab3296c 295static int write_shallow_commits_1(struct strbuf *out, int use_pack_protocol,
910650d2 296 const struct oid_array *extra,
eab3296c 297 unsigned flags)
3125fe52
NTND
298{
299 struct write_shallow_data data;
1a30f5a2 300 int i;
3125fe52
NTND
301 data.out = out;
302 data.use_pack_protocol = use_pack_protocol;
303 data.count = 0;
eab3296c 304 data.flags = flags;
3125fe52 305 for_each_commit_graft(write_one_shallow, &data);
1a30f5a2
NTND
306 if (!extra)
307 return data.count;
308 for (i = 0; i < extra->nr; i++) {
ee3051bd 309 strbuf_addstr(out, oid_to_hex(extra->oid + i));
1a30f5a2
NTND
310 strbuf_addch(out, '\n');
311 data.count++;
312 }
3125fe52
NTND
313 return data.count;
314}
315
eab3296c 316int write_shallow_commits(struct strbuf *out, int use_pack_protocol,
910650d2 317 const struct oid_array *extra)
eab3296c
NTND
318{
319 return write_shallow_commits_1(out, use_pack_protocol, extra, 0);
320}
321
910650d2 322const char *setup_temporary_shallow(const struct oid_array *extra)
08ea65ad 323{
076aa2cb 324 struct tempfile *temp;
08ea65ad 325 struct strbuf sb = STRBUF_INIT;
08ea65ad 326
1a30f5a2 327 if (write_shallow_commits(&sb, 0, extra)) {
076aa2cb 328 temp = xmks_tempfile(git_path("shallow_XXXXXX"));
0179c945 329
c50424a6 330 if (write_in_full(temp->fd, sb.buf, sb.len) < 0 ||
076aa2cb 331 close_tempfile_gently(temp) < 0)
08ea65ad 332 die_errno("failed to write to %s",
076aa2cb 333 get_tempfile_path(temp));
08ea65ad 334 strbuf_release(&sb);
076aa2cb 335 return get_tempfile_path(temp);
08ea65ad
NTND
336 }
337 /*
338 * is_repository_shallow() sees empty string as "no shallow
339 * file".
340 */
08990139 341 return "";
08ea65ad
NTND
342}
343
3125fe52 344void setup_alternate_shallow(struct lock_file *shallow_lock,
1a30f5a2 345 const char **alternate_shallow_file,
910650d2 346 const struct oid_array *extra)
3125fe52
NTND
347{
348 struct strbuf sb = STRBUF_INIT;
349 int fd;
350
102de880
SB
351 fd = hold_lock_file_for_update(shallow_lock,
352 git_path_shallow(the_repository),
3125fe52 353 LOCK_DIE_ON_ERROR);
22bdc7c4 354 check_shallow_file_for_update(the_repository);
1a30f5a2 355 if (write_shallow_commits(&sb, 0, extra)) {
06f46f23 356 if (write_in_full(fd, sb.buf, sb.len) < 0)
3125fe52 357 die_errno("failed to write to %s",
b4fb09e4
MH
358 get_lock_file_path(shallow_lock));
359 *alternate_shallow_file = get_lock_file_path(shallow_lock);
3125fe52
NTND
360 } else
361 /*
362 * is_repository_shallow() sees empty string as "no
363 * shallow file".
364 */
365 *alternate_shallow_file = "";
366 strbuf_release(&sb);
367}
ad491366
NTND
368
369static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
370{
371 int fd = *(int *)cb;
372 if (graft->nr_parent == -1)
81c634e9 373 packet_write_fmt(fd, "shallow %s\n", oid_to_hex(&graft->oid));
ad491366
NTND
374 return 0;
375}
376
377void advertise_shallow_grafts(int fd)
378{
c8813487 379 if (!is_repository_shallow(the_repository))
ad491366
NTND
380 return;
381 for_each_commit_graft(advertise_shallow_grafts_cb, &fd);
382}
58babfff 383
eab3296c
NTND
384/*
385 * mark_reachable_objects() should have been run prior to this and all
2588f6ed
JS
386 * reachable commits marked as "SEEN", except when quick_prune is non-zero,
387 * in which case lines are excised from the shallow file if they refer to
388 * commits that do not exist (any longer).
eab3296c 389 */
2588f6ed 390void prune_shallow(unsigned options)
eab3296c 391{
b2275868 392 struct lock_file shallow_lock = LOCK_INIT;
eab3296c 393 struct strbuf sb = STRBUF_INIT;
2588f6ed 394 unsigned flags = SEEN_ONLY;
eab3296c
NTND
395 int fd;
396
2588f6ed
JS
397 if (options & PRUNE_QUICK)
398 flags |= QUICK;
399
400 if (options & PRUNE_SHOW_ONLY) {
401 flags |= VERBOSE;
402 write_shallow_commits_1(&sb, 0, NULL, flags);
eab3296c
NTND
403 strbuf_release(&sb);
404 return;
405 }
102de880
SB
406 fd = hold_lock_file_for_update(&shallow_lock,
407 git_path_shallow(the_repository),
eab3296c 408 LOCK_DIE_ON_ERROR);
22bdc7c4 409 check_shallow_file_for_update(the_repository);
2588f6ed 410 if (write_shallow_commits_1(&sb, 0, NULL, flags)) {
06f46f23 411 if (write_in_full(fd, sb.buf, sb.len) < 0)
eab3296c 412 die_errno("failed to write to %s",
b4fb09e4 413 get_lock_file_path(&shallow_lock));
eab3296c
NTND
414 commit_lock_file(&shallow_lock);
415 } else {
102de880 416 unlink(git_path_shallow(the_repository));
eab3296c
NTND
417 rollback_lock_file(&shallow_lock);
418 }
419 strbuf_release(&sb);
420}
421
6aa30857 422struct trace_key trace_shallow = TRACE_KEY_INIT(SHALLOW);
58babfff
NTND
423
424/*
425 * Step 1, split sender shallow commits into "ours" and "theirs"
426 * Step 2, clean "ours" based on .git/shallow
427 */
910650d2 428void prepare_shallow_info(struct shallow_info *info, struct oid_array *sa)
58babfff
NTND
429{
430 int i;
6aa30857 431 trace_printf_key(&trace_shallow, "shallow: prepare_shallow_info\n");
58babfff
NTND
432 memset(info, 0, sizeof(*info));
433 info->shallow = sa;
434 if (!sa)
435 return;
b32fa95f
JK
436 ALLOC_ARRAY(info->ours, sa->nr);
437 ALLOC_ARRAY(info->theirs, sa->nr);
58babfff 438 for (i = 0; i < sa->nr; i++) {
ee3051bd 439 if (has_object_file(sa->oid + i)) {
58babfff 440 struct commit_graft *graft;
1f93ecd1
JN
441 graft = lookup_commit_graft(the_repository,
442 &sa->oid[i]);
58babfff
NTND
443 if (graft && graft->nr_parent < 0)
444 continue;
445 info->ours[info->nr_ours++] = i;
446 } else
447 info->theirs[info->nr_theirs++] = i;
448 }
449}
450
451void clear_shallow_info(struct shallow_info *info)
452{
453 free(info->ours);
454 free(info->theirs);
455}
456
457/* Step 4, remove non-existent ones in "theirs" after getting the pack */
458
459void remove_nonexistent_theirs_shallow(struct shallow_info *info)
460{
ee3051bd 461 struct object_id *oid = info->shallow->oid;
58babfff 462 int i, dst;
6aa30857 463 trace_printf_key(&trace_shallow, "shallow: remove_nonexistent_theirs_shallow\n");
58babfff
NTND
464 for (i = dst = 0; i < info->nr_theirs; i++) {
465 if (i != dst)
466 info->theirs[dst] = info->theirs[i];
ee3051bd 467 if (has_object_file(oid + info->theirs[i]))
58babfff
NTND
468 dst++;
469 }
470 info->nr_theirs = dst;
471}
472
8e277383
NTND
473define_commit_slab(ref_bitmap, uint32_t *);
474
6bc3d8c5
NTND
475#define POOL_SIZE (512 * 1024)
476
8e277383
NTND
477struct paint_info {
478 struct ref_bitmap ref_bitmap;
479 unsigned nr_bits;
0afd307a 480 char **pools;
8e277383 481 char *free, *end;
0afd307a 482 unsigned pool_count;
8e277383
NTND
483};
484
485static uint32_t *paint_alloc(struct paint_info *info)
486{
42c78a21 487 unsigned nr = DIV_ROUND_UP(info->nr_bits, 32);
8e277383
NTND
488 unsigned size = nr * sizeof(uint32_t);
489 void *p;
381aa8e7 490 if (!info->pool_count || size > info->end - info->free) {
f2386c6b 491 if (size > POOL_SIZE)
033abf97 492 BUG("pool size too small for %d in paint_alloc()",
f2386c6b 493 size);
0afd307a
NTND
494 info->pool_count++;
495 REALLOC_ARRAY(info->pools, info->pool_count);
6bc3d8c5 496 info->free = xmalloc(POOL_SIZE);
0afd307a 497 info->pools[info->pool_count - 1] = info->free;
6bc3d8c5 498 info->end = info->free + POOL_SIZE;
8e277383
NTND
499 }
500 p = info->free;
501 info->free += size;
502 return p;
503}
504
505/*
506 * Given a commit SHA-1, walk down to parents until either SEEN,
507 * UNINTERESTING or BOTTOM is hit. Set the id-th bit in ref_bitmap for
508 * all walked commits.
509 */
1e43ed98 510static void paint_down(struct paint_info *info, const struct object_id *oid,
1127b3ce 511 unsigned int id)
8e277383
NTND
512{
513 unsigned int i, nr;
514 struct commit_list *head = NULL;
42c78a21 515 int bitmap_nr = DIV_ROUND_UP(info->nr_bits, 32);
50492f7b 516 size_t bitmap_size = st_mult(sizeof(uint32_t), bitmap_nr);
21e1ee8f
SB
517 struct commit *c = lookup_commit_reference_gently(the_repository, oid,
518 1);
7c565a6b
JS
519 uint32_t *tmp; /* to be freed before return */
520 uint32_t *bitmap;
521
8e277383
NTND
522 if (!c)
523 return;
7c565a6b
JS
524
525 tmp = xmalloc(bitmap_size);
526 bitmap = paint_alloc(info);
8e277383 527 memset(bitmap, 0, bitmap_size);
1127b3ce 528 bitmap[id / 32] |= (1U << (id % 32));
8e277383
NTND
529 commit_list_insert(c, &head);
530 while (head) {
531 struct commit_list *p;
e510ab89 532 struct commit *c = pop_commit(&head);
8e277383
NTND
533 uint32_t **refs = ref_bitmap_at(&info->ref_bitmap, c);
534
8e277383
NTND
535 /* XXX check "UNINTERESTING" from pack bitmaps if available */
536 if (c->object.flags & (SEEN | UNINTERESTING))
537 continue;
538 else
539 c->object.flags |= SEEN;
540
541 if (*refs == NULL)
542 *refs = bitmap;
543 else {
544 memcpy(tmp, *refs, bitmap_size);
545 for (i = 0; i < bitmap_nr; i++)
546 tmp[i] |= bitmap[i];
547 if (memcmp(tmp, *refs, bitmap_size)) {
548 *refs = paint_alloc(info);
549 memcpy(*refs, tmp, bitmap_size);
550 }
551 }
552
553 if (c->object.flags & BOTTOM)
554 continue;
555
556 if (parse_commit(c))
557 die("unable to parse commit %s",
f2fd0760 558 oid_to_hex(&c->object.oid));
8e277383
NTND
559
560 for (p = c->parents; p; p = p->next) {
8e277383
NTND
561 if (p->item->object.flags & SEEN)
562 continue;
8e277383
NTND
563 commit_list_insert(p->item, &head);
564 }
565 }
566
567 nr = get_max_object_index();
568 for (i = 0; i < nr; i++) {
569 struct object *o = get_indexed_object(i);
570 if (o && o->type == OBJ_COMMIT)
571 o->flags &= ~SEEN;
572 }
573
574 free(tmp);
575}
576
580b04ef 577static int mark_uninteresting(const char *refname, const struct object_id *oid,
8e277383
NTND
578 int flags, void *cb_data)
579{
21e1ee8f
SB
580 struct commit *commit = lookup_commit_reference_gently(the_repository,
581 oid, 1);
8e277383
NTND
582 if (!commit)
583 return 0;
584 commit->object.flags |= UNINTERESTING;
585 mark_parents_uninteresting(commit);
586 return 0;
587}
588
589static void post_assign_shallow(struct shallow_info *info,
590 struct ref_bitmap *ref_bitmap,
591 int *ref_status);
592/*
593 * Step 6(+7), associate shallow commits with new refs
594 *
595 * info->ref must be initialized before calling this function.
596 *
597 * If used is not NULL, it's an array of info->shallow->nr
598 * bitmaps. The n-th bit set in the m-th bitmap if ref[n] needs the
599 * m-th shallow commit from info->shallow.
600 *
601 * If used is NULL, "ours" and "theirs" are updated. And if ref_status
602 * is not NULL it's an array of ref->nr ints. ref_status[i] is true if
603 * the ref needs some shallow commits from either info->ours or
604 * info->theirs.
605 */
606void assign_shallow_commits_to_refs(struct shallow_info *info,
607 uint32_t **used, int *ref_status)
608{
ee3051bd 609 struct object_id *oid = info->shallow->oid;
910650d2 610 struct oid_array *ref = info->ref;
8e277383
NTND
611 unsigned int i, nr;
612 int *shallow, nr_shallow = 0;
613 struct paint_info pi;
614
6aa30857 615 trace_printf_key(&trace_shallow, "shallow: assign_shallow_commits_to_refs\n");
b32fa95f 616 ALLOC_ARRAY(shallow, info->nr_ours + info->nr_theirs);
8e277383
NTND
617 for (i = 0; i < info->nr_ours; i++)
618 shallow[nr_shallow++] = info->ours[i];
619 for (i = 0; i < info->nr_theirs; i++)
620 shallow[nr_shallow++] = info->theirs[i];
621
622 /*
623 * Prepare the commit graph to track what refs can reach what
624 * (new) shallow commits.
625 */
626 nr = get_max_object_index();
627 for (i = 0; i < nr; i++) {
628 struct object *o = get_indexed_object(i);
629 if (!o || o->type != OBJ_COMMIT)
630 continue;
631
632 o->flags &= ~(UNINTERESTING | BOTTOM | SEEN);
633 }
634
635 memset(&pi, 0, sizeof(pi));
636 init_ref_bitmap(&pi.ref_bitmap);
637 pi.nr_bits = ref->nr;
638
639 /*
640 * "--not --all" to cut short the traversal if new refs
641 * connect to old refs. If not (e.g. force ref updates) it'll
642 * have to go down to the current shallow commits.
643 */
580b04ef
MH
644 head_ref(mark_uninteresting, NULL);
645 for_each_ref(mark_uninteresting, NULL);
8e277383
NTND
646
647 /* Mark potential bottoms so we won't go out of bound */
648 for (i = 0; i < nr_shallow; i++) {
c1f5eb49
SB
649 struct commit *c = lookup_commit(the_repository,
650 &oid[shallow[i]]);
8e277383
NTND
651 c->object.flags |= BOTTOM;
652 }
653
654 for (i = 0; i < ref->nr; i++)
1e43ed98 655 paint_down(&pi, ref->oid + i, i);
8e277383
NTND
656
657 if (used) {
42c78a21 658 int bitmap_size = DIV_ROUND_UP(pi.nr_bits, 32) * sizeof(uint32_t);
8e277383
NTND
659 memset(used, 0, sizeof(*used) * info->shallow->nr);
660 for (i = 0; i < nr_shallow; i++) {
c1f5eb49
SB
661 const struct commit *c = lookup_commit(the_repository,
662 &oid[shallow[i]]);
8e277383
NTND
663 uint32_t **map = ref_bitmap_at(&pi.ref_bitmap, c);
664 if (*map)
665 used[shallow[i]] = xmemdupz(*map, bitmap_size);
666 }
667 /*
668 * unreachable shallow commits are not removed from
669 * "ours" and "theirs". The user is supposed to run
670 * step 7 on every ref separately and not trust "ours"
671 * and "theirs" any more.
672 */
673 } else
674 post_assign_shallow(info, &pi.ref_bitmap, ref_status);
675
676 clear_ref_bitmap(&pi.ref_bitmap);
0afd307a
NTND
677 for (i = 0; i < pi.pool_count; i++)
678 free(pi.pools[i]);
679 free(pi.pools);
8e277383
NTND
680 free(shallow);
681}
682
683struct commit_array {
684 struct commit **commits;
685 int nr, alloc;
686};
687
580b04ef
MH
688static int add_ref(const char *refname, const struct object_id *oid,
689 int flags, void *cb_data)
8e277383
NTND
690{
691 struct commit_array *ca = cb_data;
692 ALLOC_GROW(ca->commits, ca->nr + 1, ca->alloc);
21e1ee8f
SB
693 ca->commits[ca->nr] = lookup_commit_reference_gently(the_repository,
694 oid, 1);
8e277383
NTND
695 if (ca->commits[ca->nr])
696 ca->nr++;
697 return 0;
698}
699
700static void update_refstatus(int *ref_status, int nr, uint32_t *bitmap)
701{
1127b3ce 702 unsigned int i;
8e277383
NTND
703 if (!ref_status)
704 return;
705 for (i = 0; i < nr; i++)
1127b3ce 706 if (bitmap[i / 32] & (1U << (i % 32)))
8e277383
NTND
707 ref_status[i]++;
708}
709
710/*
711 * Step 7, reachability test on "ours" at commit level
712 */
713static void post_assign_shallow(struct shallow_info *info,
714 struct ref_bitmap *ref_bitmap,
715 int *ref_status)
716{
ee3051bd 717 struct object_id *oid = info->shallow->oid;
8e277383
NTND
718 struct commit *c;
719 uint32_t **bitmap;
720 int dst, i, j;
42c78a21 721 int bitmap_nr = DIV_ROUND_UP(info->ref->nr, 32);
8e277383
NTND
722 struct commit_array ca;
723
6aa30857 724 trace_printf_key(&trace_shallow, "shallow: post_assign_shallow\n");
8e277383
NTND
725 if (ref_status)
726 memset(ref_status, 0, sizeof(*ref_status) * info->ref->nr);
727
728 /* Remove unreachable shallow commits from "theirs" */
729 for (i = dst = 0; i < info->nr_theirs; i++) {
730 if (i != dst)
731 info->theirs[dst] = info->theirs[i];
c1f5eb49 732 c = lookup_commit(the_repository, &oid[info->theirs[i]]);
8e277383
NTND
733 bitmap = ref_bitmap_at(ref_bitmap, c);
734 if (!*bitmap)
735 continue;
736 for (j = 0; j < bitmap_nr; j++)
737 if (bitmap[0][j]) {
738 update_refstatus(ref_status, info->ref->nr, *bitmap);
739 dst++;
740 break;
741 }
742 }
743 info->nr_theirs = dst;
744
745 memset(&ca, 0, sizeof(ca));
580b04ef
MH
746 head_ref(add_ref, &ca);
747 for_each_ref(add_ref, &ca);
8e277383
NTND
748
749 /* Remove unreachable shallow commits from "ours" */
750 for (i = dst = 0; i < info->nr_ours; i++) {
751 if (i != dst)
752 info->ours[dst] = info->ours[i];
c1f5eb49 753 c = lookup_commit(the_repository, &oid[info->ours[i]]);
8e277383
NTND
754 bitmap = ref_bitmap_at(ref_bitmap, c);
755 if (!*bitmap)
756 continue;
757 for (j = 0; j < bitmap_nr; j++)
758 if (bitmap[0][j] &&
759 /* Step 7, reachability test at commit level */
760 !in_merge_bases_many(c, ca.nr, ca.commits)) {
761 update_refstatus(ref_status, info->ref->nr, *bitmap);
762 dst++;
763 break;
764 }
765 }
766 info->nr_ours = dst;
767
768 free(ca.commits);
769}
0a1bc12b
NTND
770
771/* (Delayed) step 7, reachability test at commit level */
772int delayed_reachability_test(struct shallow_info *si, int c)
773{
774 if (si->need_reachability_test[c]) {
c1f5eb49
SB
775 struct commit *commit = lookup_commit(the_repository,
776 &si->shallow->oid[c]);
0a1bc12b
NTND
777
778 if (!si->commits) {
779 struct commit_array ca;
2b2a5be3 780
0a1bc12b 781 memset(&ca, 0, sizeof(ca));
580b04ef
MH
782 head_ref(add_ref, &ca);
783 for_each_ref(add_ref, &ca);
0a1bc12b
NTND
784 si->commits = ca.commits;
785 si->nr_commits = ca.nr;
786 }
787
788 si->reachable[c] = in_merge_bases_many(commit,
789 si->nr_commits,
790 si->commits);
791 si->need_reachability_test[c] = 0;
792 }
793 return si->reachable[c];
794}