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