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revision.c: use commit-slab for show_source
[thirdparty/git.git] / shallow.c
CommitLineData
ed09aef0 1#include "cache.h"
6e122b44 2#include "tempfile.h"
697cc8ef 3#include "lockfile.h"
ed09aef0 4#include "commit.h"
abef3a16 5#include "tag.h"
3125fe52 6#include "pkt-line.h"
58babfff
NTND
7#include "remote.h"
8#include "refs.h"
9#include "sha1-array.h"
10#include "diff.h"
11#include "revision.h"
12#include "commit-slab.h"
3d9ff4d7
NTND
13#include "revision.h"
14#include "list-objects.h"
58dbe58f 15#include "commit-slab.h"
ed09aef0
JS
16
17static int is_shallow = -1;
0cc77c38 18static struct stat_validity shallow_stat;
6035d6aa
NTND
19static char *alternate_shallow_file;
20
069c0532 21void set_alternate_shallow_file(const char *path, int override)
6035d6aa
NTND
22{
23 if (is_shallow != -1)
24 die("BUG: is_repository_shallow must not be called before set_alternate_shallow_file");
069c0532
NTND
25 if (alternate_shallow_file && !override)
26 return;
6035d6aa 27 free(alternate_shallow_file);
8c53f071 28 alternate_shallow_file = xstrdup_or_null(path);
6035d6aa 29}
ed09aef0 30
e92b848c 31int register_shallow(const struct object_id *oid)
ed09aef0
JS
32{
33 struct commit_graft *graft =
34 xmalloc(sizeof(struct commit_graft));
bc83266a 35 struct commit *commit = lookup_commit(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;
41 return register_commit_graft(graft, 0);
42}
43
f43117a6 44int is_repository_shallow(void)
ed09aef0
JS
45{
46 FILE *fp;
47 char buf[1024];
6035d6aa 48 const char *path = alternate_shallow_file;
ed09aef0
JS
49
50 if (is_shallow >= 0)
51 return is_shallow;
52
6035d6aa 53 if (!path)
f932729c 54 path = git_path_shallow();
6035d6aa
NTND
55 /*
56 * fetch-pack sets '--shallow-file ""' as an indicator that no
57 * shallow file should be used. We could just open it and it
58 * will likely fail. But let's do an explicit check instead.
59 */
0cc77c38
JK
60 if (!*path || (fp = fopen(path, "r")) == NULL) {
61 stat_validity_clear(&shallow_stat);
ed09aef0
JS
62 is_shallow = 0;
63 return is_shallow;
64 }
0cc77c38 65 stat_validity_update(&shallow_stat, fileno(fp));
ed09aef0
JS
66 is_shallow = 1;
67
68 while (fgets(buf, sizeof(buf), fp)) {
e92b848c 69 struct object_id oid;
70 if (get_oid_hex(buf, &oid))
ed09aef0 71 die("bad shallow line: %s", buf);
e92b848c 72 register_shallow(&oid);
ed09aef0
JS
73 }
74 fclose(fp);
75 return is_shallow;
76}
77
58dbe58f
NTND
78/*
79 * TODO: use "int" elemtype instead of "int *" when/if commit-slab
80 * supports a "valid" flag.
81 */
82define_commit_slab(commit_depth, int *);
f53514bc
JS
83struct commit_list *get_shallow_commits(struct object_array *heads, int depth,
84 int shallow_flag, int not_shallow_flag)
ed09aef0
JS
85{
86 int i = 0, cur_depth = 0;
87 struct commit_list *result = NULL;
3cd47459 88 struct object_array stack = OBJECT_ARRAY_INIT;
ed09aef0 89 struct commit *commit = NULL;
79d3a236 90 struct commit_graft *graft;
58dbe58f 91 struct commit_depth depths;
ed09aef0 92
58dbe58f 93 init_commit_depth(&depths);
ed09aef0
JS
94 while (commit || i < heads->nr || stack.nr) {
95 struct commit_list *p;
96 if (!commit) {
97 if (i < heads->nr) {
58dbe58f 98 int **depth_slot;
ed09aef0 99 commit = (struct commit *)
abef3a16 100 deref_tag(heads->objects[i++].item, NULL, 0);
affeef12 101 if (!commit || commit->object.type != OBJ_COMMIT) {
ed09aef0
JS
102 commit = NULL;
103 continue;
104 }
58dbe58f
NTND
105 depth_slot = commit_depth_at(&depths, commit);
106 if (!*depth_slot)
107 *depth_slot = xmalloc(sizeof(int));
108 **depth_slot = 0;
ed09aef0
JS
109 cur_depth = 0;
110 } else {
111 commit = (struct commit *)
71992039 112 object_array_pop(&stack);
58dbe58f 113 cur_depth = **commit_depth_at(&depths, commit);
ed09aef0
JS
114 }
115 }
367068e0 116 parse_commit_or_die(commit);
ed09aef0 117 cur_depth++;
79d3a236
NTND
118 if ((depth != INFINITE_DEPTH && cur_depth >= depth) ||
119 (is_repository_shallow() && !commit->parents &&
8b65a34c 120 (graft = lookup_commit_graft(&commit->object.oid)) != NULL &&
79d3a236 121 graft->nr_parent < 0)) {
682c7d2f
NTND
122 commit_list_insert(commit, &result);
123 commit->object.flags |= shallow_flag;
124 commit = NULL;
125 continue;
126 }
127 commit->object.flags |= not_shallow_flag;
ed09aef0 128 for (p = commit->parents, commit = NULL; p; p = p->next) {
58dbe58f
NTND
129 int **depth_slot = commit_depth_at(&depths, p->item);
130 if (!*depth_slot) {
131 *depth_slot = xmalloc(sizeof(int));
132 **depth_slot = cur_depth;
ed09aef0 133 } else {
58dbe58f 134 if (cur_depth >= **depth_slot)
ed09aef0 135 continue;
58dbe58f 136 **depth_slot = cur_depth;
ed09aef0 137 }
4b796951
MK
138 if (p->next)
139 add_object_array(&p->item->object,
140 NULL, &stack);
141 else {
142 commit = p->item;
58dbe58f 143 cur_depth = **commit_depth_at(&depths, commit);
f53514bc 144 }
ed09aef0
JS
145 }
146 }
58dbe58f
NTND
147 for (i = 0; i < depths.slab_count; i++) {
148 int j;
149
150 for (j = 0; j < depths.slab_size; j++)
151 free(depths.slab[i][j]);
152 }
153 clear_commit_depth(&depths);
ed09aef0
JS
154
155 return result;
156}
6035d6aa 157
3d9ff4d7
NTND
158static void show_commit(struct commit *commit, void *data)
159{
160 commit_list_insert(commit, data);
161}
162
163/*
164 * Given rev-list arguments, run rev-list. All reachable commits
165 * except border ones are marked with not_shallow_flag. Border commits
166 * are marked with shallow_flag. The list of border/shallow commits
167 * are also returned.
168 */
169struct commit_list *get_shallow_commits_by_rev_list(int ac, const char **av,
170 int shallow_flag,
171 int not_shallow_flag)
172{
173 struct commit_list *result = NULL, *p;
174 struct commit_list *not_shallow_list = NULL;
175 struct rev_info revs;
176 int both_flags = shallow_flag | not_shallow_flag;
177
178 /*
179 * SHALLOW (excluded) and NOT_SHALLOW (included) should not be
180 * set at this point. But better be safe than sorry.
181 */
182 clear_object_flags(both_flags);
183
184 is_repository_shallow(); /* make sure shallows are read */
185
186 init_revisions(&revs, NULL);
187 save_commit_buffer = 0;
188 setup_revisions(ac, av, &revs, NULL);
189
190 if (prepare_revision_walk(&revs))
191 die("revision walk setup failed");
192 traverse_commit_list(&revs, show_commit, NULL, &not_shallow_list);
193
194 /* Mark all reachable commits as NOT_SHALLOW */
195 for (p = not_shallow_list; p; p = p->next)
196 p->item->object.flags |= not_shallow_flag;
197
198 /*
199 * mark border commits SHALLOW + NOT_SHALLOW.
200 * We cannot clear NOT_SHALLOW right now. Imagine border
201 * commit A is processed first, then commit B, whose parent is
202 * A, later. If NOT_SHALLOW on A is cleared at step 1, B
203 * itself is considered border at step 2, which is incorrect.
204 */
205 for (p = not_shallow_list; p; p = p->next) {
206 struct commit *c = p->item;
207 struct commit_list *parent;
208
209 if (parse_commit(c))
210 die("unable to parse commit %s",
211 oid_to_hex(&c->object.oid));
212
213 for (parent = c->parents; parent; parent = parent->next)
214 if (!(parent->item->object.flags & not_shallow_flag)) {
215 c->object.flags |= shallow_flag;
216 commit_list_insert(c, &result);
217 break;
218 }
219 }
220 free_commit_list(not_shallow_list);
221
222 /*
223 * Now we can clean up NOT_SHALLOW on border commits. Having
224 * both flags set can confuse the caller.
225 */
226 for (p = result; p; p = p->next) {
227 struct object *o = &p->item->object;
228 if ((o->flags & both_flags) == both_flags)
229 o->flags &= ~not_shallow_flag;
230 }
231 return result;
232}
233
167832c2 234static void check_shallow_file_for_update(void)
6035d6aa 235{
0cc77c38 236 if (is_shallow == -1)
6035d6aa
NTND
237 die("BUG: shallow must be initialized by now");
238
f932729c 239 if (!stat_validity_check(&shallow_stat, git_path_shallow()))
0cc77c38 240 die("shallow file has changed since we read it");
6035d6aa 241}
3125fe52 242
eab3296c
NTND
243#define SEEN_ONLY 1
244#define VERBOSE 2
245
3125fe52
NTND
246struct write_shallow_data {
247 struct strbuf *out;
248 int use_pack_protocol;
249 int count;
eab3296c 250 unsigned flags;
3125fe52
NTND
251};
252
253static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
254{
255 struct write_shallow_data *data = cb_data;
7683e2e6 256 const char *hex = oid_to_hex(&graft->oid);
6a3bbb4d
NTND
257 if (graft->nr_parent != -1)
258 return 0;
eab3296c 259 if (data->flags & SEEN_ONLY) {
bc83266a 260 struct commit *c = lookup_commit(&graft->oid);
eab3296c
NTND
261 if (!c || !(c->object.flags & SEEN)) {
262 if (data->flags & VERBOSE)
263 printf("Removing %s from .git/shallow\n",
f2fd0760 264 oid_to_hex(&c->object.oid));
eab3296c
NTND
265 return 0;
266 }
267 }
3125fe52
NTND
268 data->count++;
269 if (data->use_pack_protocol)
270 packet_buf_write(data->out, "shallow %s", hex);
271 else {
272 strbuf_addstr(data->out, hex);
273 strbuf_addch(data->out, '\n');
274 }
275 return 0;
276}
277
eab3296c 278static int write_shallow_commits_1(struct strbuf *out, int use_pack_protocol,
910650d2 279 const struct oid_array *extra,
eab3296c 280 unsigned flags)
3125fe52
NTND
281{
282 struct write_shallow_data data;
1a30f5a2 283 int i;
3125fe52
NTND
284 data.out = out;
285 data.use_pack_protocol = use_pack_protocol;
286 data.count = 0;
eab3296c 287 data.flags = flags;
3125fe52 288 for_each_commit_graft(write_one_shallow, &data);
1a30f5a2
NTND
289 if (!extra)
290 return data.count;
291 for (i = 0; i < extra->nr; i++) {
ee3051bd 292 strbuf_addstr(out, oid_to_hex(extra->oid + i));
1a30f5a2
NTND
293 strbuf_addch(out, '\n');
294 data.count++;
295 }
3125fe52
NTND
296 return data.count;
297}
298
eab3296c 299int write_shallow_commits(struct strbuf *out, int use_pack_protocol,
910650d2 300 const struct oid_array *extra)
eab3296c
NTND
301{
302 return write_shallow_commits_1(out, use_pack_protocol, extra, 0);
303}
304
910650d2 305const char *setup_temporary_shallow(const struct oid_array *extra)
08ea65ad 306{
076aa2cb 307 struct tempfile *temp;
08ea65ad 308 struct strbuf sb = STRBUF_INIT;
08ea65ad 309
1a30f5a2 310 if (write_shallow_commits(&sb, 0, extra)) {
076aa2cb 311 temp = xmks_tempfile(git_path("shallow_XXXXXX"));
0179c945 312
c50424a6 313 if (write_in_full(temp->fd, sb.buf, sb.len) < 0 ||
076aa2cb 314 close_tempfile_gently(temp) < 0)
08ea65ad 315 die_errno("failed to write to %s",
076aa2cb 316 get_tempfile_path(temp));
08ea65ad 317 strbuf_release(&sb);
076aa2cb 318 return get_tempfile_path(temp);
08ea65ad
NTND
319 }
320 /*
321 * is_repository_shallow() sees empty string as "no shallow
322 * file".
323 */
08990139 324 return "";
08ea65ad
NTND
325}
326
3125fe52 327void setup_alternate_shallow(struct lock_file *shallow_lock,
1a30f5a2 328 const char **alternate_shallow_file,
910650d2 329 const struct oid_array *extra)
3125fe52
NTND
330{
331 struct strbuf sb = STRBUF_INIT;
332 int fd;
333
f932729c 334 fd = hold_lock_file_for_update(shallow_lock, git_path_shallow(),
3125fe52 335 LOCK_DIE_ON_ERROR);
78396321 336 check_shallow_file_for_update();
1a30f5a2 337 if (write_shallow_commits(&sb, 0, extra)) {
06f46f23 338 if (write_in_full(fd, sb.buf, sb.len) < 0)
3125fe52 339 die_errno("failed to write to %s",
b4fb09e4
MH
340 get_lock_file_path(shallow_lock));
341 *alternate_shallow_file = get_lock_file_path(shallow_lock);
3125fe52
NTND
342 } else
343 /*
344 * is_repository_shallow() sees empty string as "no
345 * shallow file".
346 */
347 *alternate_shallow_file = "";
348 strbuf_release(&sb);
349}
ad491366
NTND
350
351static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
352{
353 int fd = *(int *)cb;
354 if (graft->nr_parent == -1)
81c634e9 355 packet_write_fmt(fd, "shallow %s\n", oid_to_hex(&graft->oid));
ad491366
NTND
356 return 0;
357}
358
359void advertise_shallow_grafts(int fd)
360{
361 if (!is_repository_shallow())
362 return;
363 for_each_commit_graft(advertise_shallow_grafts_cb, &fd);
364}
58babfff 365
eab3296c
NTND
366/*
367 * mark_reachable_objects() should have been run prior to this and all
368 * reachable commits marked as "SEEN".
369 */
370void prune_shallow(int show_only)
371{
372 static struct lock_file shallow_lock;
373 struct strbuf sb = STRBUF_INIT;
374 int fd;
375
376 if (show_only) {
377 write_shallow_commits_1(&sb, 0, NULL, SEEN_ONLY | VERBOSE);
378 strbuf_release(&sb);
379 return;
380 }
f932729c 381 fd = hold_lock_file_for_update(&shallow_lock, git_path_shallow(),
eab3296c 382 LOCK_DIE_ON_ERROR);
78396321 383 check_shallow_file_for_update();
eab3296c 384 if (write_shallow_commits_1(&sb, 0, NULL, SEEN_ONLY)) {
06f46f23 385 if (write_in_full(fd, sb.buf, sb.len) < 0)
eab3296c 386 die_errno("failed to write to %s",
b4fb09e4 387 get_lock_file_path(&shallow_lock));
eab3296c
NTND
388 commit_lock_file(&shallow_lock);
389 } else {
f932729c 390 unlink(git_path_shallow());
eab3296c
NTND
391 rollback_lock_file(&shallow_lock);
392 }
393 strbuf_release(&sb);
394}
395
6aa30857 396struct trace_key trace_shallow = TRACE_KEY_INIT(SHALLOW);
58babfff
NTND
397
398/*
399 * Step 1, split sender shallow commits into "ours" and "theirs"
400 * Step 2, clean "ours" based on .git/shallow
401 */
910650d2 402void prepare_shallow_info(struct shallow_info *info, struct oid_array *sa)
58babfff
NTND
403{
404 int i;
6aa30857 405 trace_printf_key(&trace_shallow, "shallow: prepare_shallow_info\n");
58babfff
NTND
406 memset(info, 0, sizeof(*info));
407 info->shallow = sa;
408 if (!sa)
409 return;
b32fa95f
JK
410 ALLOC_ARRAY(info->ours, sa->nr);
411 ALLOC_ARRAY(info->theirs, sa->nr);
58babfff 412 for (i = 0; i < sa->nr; i++) {
ee3051bd 413 if (has_object_file(sa->oid + i)) {
58babfff 414 struct commit_graft *graft;
8b65a34c 415 graft = lookup_commit_graft(&sa->oid[i]);
58babfff
NTND
416 if (graft && graft->nr_parent < 0)
417 continue;
418 info->ours[info->nr_ours++] = i;
419 } else
420 info->theirs[info->nr_theirs++] = i;
421 }
422}
423
424void clear_shallow_info(struct shallow_info *info)
425{
426 free(info->ours);
427 free(info->theirs);
428}
429
430/* Step 4, remove non-existent ones in "theirs" after getting the pack */
431
432void remove_nonexistent_theirs_shallow(struct shallow_info *info)
433{
ee3051bd 434 struct object_id *oid = info->shallow->oid;
58babfff 435 int i, dst;
6aa30857 436 trace_printf_key(&trace_shallow, "shallow: remove_nonexistent_theirs_shallow\n");
58babfff
NTND
437 for (i = dst = 0; i < info->nr_theirs; i++) {
438 if (i != dst)
439 info->theirs[dst] = info->theirs[i];
ee3051bd 440 if (has_object_file(oid + info->theirs[i]))
58babfff
NTND
441 dst++;
442 }
443 info->nr_theirs = dst;
444}
445
8e277383
NTND
446define_commit_slab(ref_bitmap, uint32_t *);
447
6bc3d8c5
NTND
448#define POOL_SIZE (512 * 1024)
449
8e277383
NTND
450struct paint_info {
451 struct ref_bitmap ref_bitmap;
452 unsigned nr_bits;
0afd307a 453 char **pools;
8e277383 454 char *free, *end;
0afd307a 455 unsigned pool_count;
8e277383
NTND
456};
457
458static uint32_t *paint_alloc(struct paint_info *info)
459{
42c78a21 460 unsigned nr = DIV_ROUND_UP(info->nr_bits, 32);
8e277383
NTND
461 unsigned size = nr * sizeof(uint32_t);
462 void *p;
381aa8e7 463 if (!info->pool_count || size > info->end - info->free) {
f2386c6b
NTND
464 if (size > POOL_SIZE)
465 die("BUG: pool size too small for %d in paint_alloc()",
466 size);
0afd307a
NTND
467 info->pool_count++;
468 REALLOC_ARRAY(info->pools, info->pool_count);
6bc3d8c5 469 info->free = xmalloc(POOL_SIZE);
0afd307a 470 info->pools[info->pool_count - 1] = info->free;
6bc3d8c5 471 info->end = info->free + POOL_SIZE;
8e277383
NTND
472 }
473 p = info->free;
474 info->free += size;
475 return p;
476}
477
478/*
479 * Given a commit SHA-1, walk down to parents until either SEEN,
480 * UNINTERESTING or BOTTOM is hit. Set the id-th bit in ref_bitmap for
481 * all walked commits.
482 */
1e43ed98 483static void paint_down(struct paint_info *info, const struct object_id *oid,
1127b3ce 484 unsigned int id)
8e277383
NTND
485{
486 unsigned int i, nr;
487 struct commit_list *head = NULL;
42c78a21 488 int bitmap_nr = DIV_ROUND_UP(info->nr_bits, 32);
50492f7b 489 size_t bitmap_size = st_mult(sizeof(uint32_t), bitmap_nr);
bc83266a 490 struct commit *c = lookup_commit_reference_gently(oid, 1);
7c565a6b
JS
491 uint32_t *tmp; /* to be freed before return */
492 uint32_t *bitmap;
493
8e277383
NTND
494 if (!c)
495 return;
7c565a6b
JS
496
497 tmp = xmalloc(bitmap_size);
498 bitmap = paint_alloc(info);
8e277383 499 memset(bitmap, 0, bitmap_size);
1127b3ce 500 bitmap[id / 32] |= (1U << (id % 32));
8e277383
NTND
501 commit_list_insert(c, &head);
502 while (head) {
503 struct commit_list *p;
e510ab89 504 struct commit *c = pop_commit(&head);
8e277383
NTND
505 uint32_t **refs = ref_bitmap_at(&info->ref_bitmap, c);
506
8e277383
NTND
507 /* XXX check "UNINTERESTING" from pack bitmaps if available */
508 if (c->object.flags & (SEEN | UNINTERESTING))
509 continue;
510 else
511 c->object.flags |= SEEN;
512
513 if (*refs == NULL)
514 *refs = bitmap;
515 else {
516 memcpy(tmp, *refs, bitmap_size);
517 for (i = 0; i < bitmap_nr; i++)
518 tmp[i] |= bitmap[i];
519 if (memcmp(tmp, *refs, bitmap_size)) {
520 *refs = paint_alloc(info);
521 memcpy(*refs, tmp, bitmap_size);
522 }
523 }
524
525 if (c->object.flags & BOTTOM)
526 continue;
527
528 if (parse_commit(c))
529 die("unable to parse commit %s",
f2fd0760 530 oid_to_hex(&c->object.oid));
8e277383
NTND
531
532 for (p = c->parents; p; p = p->next) {
8e277383
NTND
533 if (p->item->object.flags & SEEN)
534 continue;
8e277383
NTND
535 commit_list_insert(p->item, &head);
536 }
537 }
538
539 nr = get_max_object_index();
540 for (i = 0; i < nr; i++) {
541 struct object *o = get_indexed_object(i);
542 if (o && o->type == OBJ_COMMIT)
543 o->flags &= ~SEEN;
544 }
545
546 free(tmp);
547}
548
580b04ef 549static int mark_uninteresting(const char *refname, const struct object_id *oid,
8e277383
NTND
550 int flags, void *cb_data)
551{
bc83266a 552 struct commit *commit = lookup_commit_reference_gently(oid, 1);
8e277383
NTND
553 if (!commit)
554 return 0;
555 commit->object.flags |= UNINTERESTING;
556 mark_parents_uninteresting(commit);
557 return 0;
558}
559
560static void post_assign_shallow(struct shallow_info *info,
561 struct ref_bitmap *ref_bitmap,
562 int *ref_status);
563/*
564 * Step 6(+7), associate shallow commits with new refs
565 *
566 * info->ref must be initialized before calling this function.
567 *
568 * If used is not NULL, it's an array of info->shallow->nr
569 * bitmaps. The n-th bit set in the m-th bitmap if ref[n] needs the
570 * m-th shallow commit from info->shallow.
571 *
572 * If used is NULL, "ours" and "theirs" are updated. And if ref_status
573 * is not NULL it's an array of ref->nr ints. ref_status[i] is true if
574 * the ref needs some shallow commits from either info->ours or
575 * info->theirs.
576 */
577void assign_shallow_commits_to_refs(struct shallow_info *info,
578 uint32_t **used, int *ref_status)
579{
ee3051bd 580 struct object_id *oid = info->shallow->oid;
910650d2 581 struct oid_array *ref = info->ref;
8e277383
NTND
582 unsigned int i, nr;
583 int *shallow, nr_shallow = 0;
584 struct paint_info pi;
585
6aa30857 586 trace_printf_key(&trace_shallow, "shallow: assign_shallow_commits_to_refs\n");
b32fa95f 587 ALLOC_ARRAY(shallow, info->nr_ours + info->nr_theirs);
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NTND
588 for (i = 0; i < info->nr_ours; i++)
589 shallow[nr_shallow++] = info->ours[i];
590 for (i = 0; i < info->nr_theirs; i++)
591 shallow[nr_shallow++] = info->theirs[i];
592
593 /*
594 * Prepare the commit graph to track what refs can reach what
595 * (new) shallow commits.
596 */
597 nr = get_max_object_index();
598 for (i = 0; i < nr; i++) {
599 struct object *o = get_indexed_object(i);
600 if (!o || o->type != OBJ_COMMIT)
601 continue;
602
603 o->flags &= ~(UNINTERESTING | BOTTOM | SEEN);
604 }
605
606 memset(&pi, 0, sizeof(pi));
607 init_ref_bitmap(&pi.ref_bitmap);
608 pi.nr_bits = ref->nr;
609
610 /*
611 * "--not --all" to cut short the traversal if new refs
612 * connect to old refs. If not (e.g. force ref updates) it'll
613 * have to go down to the current shallow commits.
614 */
580b04ef
MH
615 head_ref(mark_uninteresting, NULL);
616 for_each_ref(mark_uninteresting, NULL);
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617
618 /* Mark potential bottoms so we won't go out of bound */
619 for (i = 0; i < nr_shallow; i++) {
bc83266a 620 struct commit *c = lookup_commit(&oid[shallow[i]]);
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621 c->object.flags |= BOTTOM;
622 }
623
624 for (i = 0; i < ref->nr; i++)
1e43ed98 625 paint_down(&pi, ref->oid + i, i);
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626
627 if (used) {
42c78a21 628 int bitmap_size = DIV_ROUND_UP(pi.nr_bits, 32) * sizeof(uint32_t);
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629 memset(used, 0, sizeof(*used) * info->shallow->nr);
630 for (i = 0; i < nr_shallow; i++) {
bc83266a 631 const struct commit *c = lookup_commit(&oid[shallow[i]]);
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632 uint32_t **map = ref_bitmap_at(&pi.ref_bitmap, c);
633 if (*map)
634 used[shallow[i]] = xmemdupz(*map, bitmap_size);
635 }
636 /*
637 * unreachable shallow commits are not removed from
638 * "ours" and "theirs". The user is supposed to run
639 * step 7 on every ref separately and not trust "ours"
640 * and "theirs" any more.
641 */
642 } else
643 post_assign_shallow(info, &pi.ref_bitmap, ref_status);
644
645 clear_ref_bitmap(&pi.ref_bitmap);
0afd307a
NTND
646 for (i = 0; i < pi.pool_count; i++)
647 free(pi.pools[i]);
648 free(pi.pools);
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649 free(shallow);
650}
651
652struct commit_array {
653 struct commit **commits;
654 int nr, alloc;
655};
656
580b04ef
MH
657static int add_ref(const char *refname, const struct object_id *oid,
658 int flags, void *cb_data)
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659{
660 struct commit_array *ca = cb_data;
661 ALLOC_GROW(ca->commits, ca->nr + 1, ca->alloc);
bc83266a 662 ca->commits[ca->nr] = lookup_commit_reference_gently(oid, 1);
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663 if (ca->commits[ca->nr])
664 ca->nr++;
665 return 0;
666}
667
668static void update_refstatus(int *ref_status, int nr, uint32_t *bitmap)
669{
1127b3ce 670 unsigned int i;
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671 if (!ref_status)
672 return;
673 for (i = 0; i < nr; i++)
1127b3ce 674 if (bitmap[i / 32] & (1U << (i % 32)))
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675 ref_status[i]++;
676}
677
678/*
679 * Step 7, reachability test on "ours" at commit level
680 */
681static void post_assign_shallow(struct shallow_info *info,
682 struct ref_bitmap *ref_bitmap,
683 int *ref_status)
684{
ee3051bd 685 struct object_id *oid = info->shallow->oid;
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686 struct commit *c;
687 uint32_t **bitmap;
688 int dst, i, j;
42c78a21 689 int bitmap_nr = DIV_ROUND_UP(info->ref->nr, 32);
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690 struct commit_array ca;
691
6aa30857 692 trace_printf_key(&trace_shallow, "shallow: post_assign_shallow\n");
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693 if (ref_status)
694 memset(ref_status, 0, sizeof(*ref_status) * info->ref->nr);
695
696 /* Remove unreachable shallow commits from "theirs" */
697 for (i = dst = 0; i < info->nr_theirs; i++) {
698 if (i != dst)
699 info->theirs[dst] = info->theirs[i];
bc83266a 700 c = lookup_commit(&oid[info->theirs[i]]);
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701 bitmap = ref_bitmap_at(ref_bitmap, c);
702 if (!*bitmap)
703 continue;
704 for (j = 0; j < bitmap_nr; j++)
705 if (bitmap[0][j]) {
706 update_refstatus(ref_status, info->ref->nr, *bitmap);
707 dst++;
708 break;
709 }
710 }
711 info->nr_theirs = dst;
712
713 memset(&ca, 0, sizeof(ca));
580b04ef
MH
714 head_ref(add_ref, &ca);
715 for_each_ref(add_ref, &ca);
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716
717 /* Remove unreachable shallow commits from "ours" */
718 for (i = dst = 0; i < info->nr_ours; i++) {
719 if (i != dst)
720 info->ours[dst] = info->ours[i];
bc83266a 721 c = lookup_commit(&oid[info->ours[i]]);
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722 bitmap = ref_bitmap_at(ref_bitmap, c);
723 if (!*bitmap)
724 continue;
725 for (j = 0; j < bitmap_nr; j++)
726 if (bitmap[0][j] &&
727 /* Step 7, reachability test at commit level */
728 !in_merge_bases_many(c, ca.nr, ca.commits)) {
729 update_refstatus(ref_status, info->ref->nr, *bitmap);
730 dst++;
731 break;
732 }
733 }
734 info->nr_ours = dst;
735
736 free(ca.commits);
737}
0a1bc12b
NTND
738
739/* (Delayed) step 7, reachability test at commit level */
740int delayed_reachability_test(struct shallow_info *si, int c)
741{
742 if (si->need_reachability_test[c]) {
bc83266a 743 struct commit *commit = lookup_commit(&si->shallow->oid[c]);
0a1bc12b
NTND
744
745 if (!si->commits) {
746 struct commit_array ca;
2b2a5be3 747
0a1bc12b 748 memset(&ca, 0, sizeof(ca));
580b04ef
MH
749 head_ref(add_ref, &ca);
750 for_each_ref(add_ref, &ca);
0a1bc12b
NTND
751 si->commits = ca.commits;
752 si->nr_commits = ca.nr;
753 }
754
755 si->reachable[c] = in_merge_bases_many(commit,
756 si->nr_commits,
757 si->commits);
758 si->need_reachability_test[c] = 0;
759 }
760 return si->reachable[c];
761}