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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"
fe299ec5 11#include "oid-array.h"
58babfff
NTND
12#include "diff.h"
13#include "revision.h"
14#include "commit-slab.h"
3d9ff4d7 15#include "list-objects.h"
64043556 16#include "commit-reach.h"
120ad2b0 17#include "shallow.h"
ed09aef0 18
eee4502b 19void set_alternate_shallow_file(struct repository *r, const char *path, int override)
6035d6aa 20{
eee4502b 21 if (r->parsed_objects->is_shallow != -1)
033abf97 22 BUG("is_repository_shallow must not be called before set_alternate_shallow_file");
eee4502b 23 if (r->parsed_objects->alternate_shallow_file && !override)
069c0532 24 return;
eee4502b
SB
25 free(r->parsed_objects->alternate_shallow_file);
26 r->parsed_objects->alternate_shallow_file = xstrdup_or_null(path);
6035d6aa 27}
ed09aef0 28
eee4502b 29int register_shallow(struct repository *r, const struct object_id *oid)
ed09aef0
JS
30{
31 struct commit_graft *graft =
32 xmalloc(sizeof(struct commit_graft));
c1f5eb49 33 struct commit *commit = lookup_commit(the_repository, oid);
ed09aef0 34
e92b848c 35 oidcpy(&graft->oid, oid);
ed09aef0
JS
36 graft->nr_parent = -1;
37 if (commit && commit->object.parsed)
38 commit->parents = NULL;
eee4502b 39 return register_commit_graft(r, graft, 0);
ed09aef0
JS
40}
41
120ad2b0
TB
42int unregister_shallow(const struct object_id *oid)
43{
98c431b6 44 int pos = commit_graft_pos(the_repository, oid);
120ad2b0
TB
45 if (pos < 0)
46 return -1;
47 if (pos + 1 < the_repository->parsed_objects->grafts_nr)
48 MOVE_ARRAY(the_repository->parsed_objects->grafts + pos,
49 the_repository->parsed_objects->grafts + pos + 1,
50 the_repository->parsed_objects->grafts_nr - pos - 1);
51 the_repository->parsed_objects->grafts_nr--;
52 return 0;
53}
54
eee4502b 55int is_repository_shallow(struct repository *r)
ed09aef0
JS
56{
57 FILE *fp;
58 char buf[1024];
eee4502b 59 const char *path = r->parsed_objects->alternate_shallow_file;
ed09aef0 60
eee4502b
SB
61 if (r->parsed_objects->is_shallow >= 0)
62 return r->parsed_objects->is_shallow;
ed09aef0 63
6035d6aa 64 if (!path)
eee4502b 65 path = git_path_shallow(r);
6035d6aa
NTND
66 /*
67 * fetch-pack sets '--shallow-file ""' as an indicator that no
68 * shallow file should be used. We could just open it and it
69 * will likely fail. But let's do an explicit check instead.
70 */
0cc77c38 71 if (!*path || (fp = fopen(path, "r")) == NULL) {
eee4502b
SB
72 stat_validity_clear(r->parsed_objects->shallow_stat);
73 r->parsed_objects->is_shallow = 0;
74 return r->parsed_objects->is_shallow;
ed09aef0 75 }
eee4502b
SB
76 stat_validity_update(r->parsed_objects->shallow_stat, fileno(fp));
77 r->parsed_objects->is_shallow = 1;
ed09aef0
JS
78
79 while (fgets(buf, sizeof(buf), fp)) {
e92b848c 80 struct object_id oid;
81 if (get_oid_hex(buf, &oid))
ed09aef0 82 die("bad shallow line: %s", buf);
eee4502b 83 register_shallow(r, &oid);
ed09aef0
JS
84 }
85 fclose(fp);
eee4502b 86 return r->parsed_objects->is_shallow;
ed09aef0
JS
87}
88
37b9dcab
TB
89static void reset_repository_shallow(struct repository *r)
90{
91 r->parsed_objects->is_shallow = -1;
92 stat_validity_clear(r->parsed_objects->shallow_stat);
93}
94
cac4b8e2 95int commit_shallow_file(struct repository *r, struct shallow_lock *lk)
37b9dcab 96{
cac4b8e2 97 int res = commit_lock_file(&lk->lock);
37b9dcab
TB
98 reset_repository_shallow(r);
99 return res;
100}
101
cac4b8e2 102void rollback_shallow_file(struct repository *r, struct shallow_lock *lk)
37b9dcab 103{
cac4b8e2 104 rollback_lock_file(&lk->lock);
37b9dcab
TB
105 reset_repository_shallow(r);
106}
107
58dbe58f
NTND
108/*
109 * TODO: use "int" elemtype instead of "int *" when/if commit-slab
110 * supports a "valid" flag.
111 */
112define_commit_slab(commit_depth, int *);
1df15f8d
SG
113static void free_depth_in_slab(int **ptr)
114{
115 FREE_AND_NULL(*ptr);
116}
f53514bc
JS
117struct commit_list *get_shallow_commits(struct object_array *heads, int depth,
118 int shallow_flag, int not_shallow_flag)
ed09aef0
JS
119{
120 int i = 0, cur_depth = 0;
121 struct commit_list *result = NULL;
3cd47459 122 struct object_array stack = OBJECT_ARRAY_INIT;
ed09aef0 123 struct commit *commit = NULL;
79d3a236 124 struct commit_graft *graft;
58dbe58f 125 struct commit_depth depths;
ed09aef0 126
58dbe58f 127 init_commit_depth(&depths);
ed09aef0
JS
128 while (commit || i < heads->nr || stack.nr) {
129 struct commit_list *p;
130 if (!commit) {
131 if (i < heads->nr) {
58dbe58f 132 int **depth_slot;
ed09aef0 133 commit = (struct commit *)
a74093da
SB
134 deref_tag(the_repository,
135 heads->objects[i++].item,
136 NULL, 0);
affeef12 137 if (!commit || commit->object.type != OBJ_COMMIT) {
ed09aef0
JS
138 commit = NULL;
139 continue;
140 }
58dbe58f
NTND
141 depth_slot = commit_depth_at(&depths, commit);
142 if (!*depth_slot)
143 *depth_slot = xmalloc(sizeof(int));
144 **depth_slot = 0;
ed09aef0
JS
145 cur_depth = 0;
146 } else {
147 commit = (struct commit *)
71992039 148 object_array_pop(&stack);
58dbe58f 149 cur_depth = **commit_depth_at(&depths, commit);
ed09aef0
JS
150 }
151 }
367068e0 152 parse_commit_or_die(commit);
ed09aef0 153 cur_depth++;
79d3a236 154 if ((depth != INFINITE_DEPTH && cur_depth >= depth) ||
c8813487 155 (is_repository_shallow(the_repository) && !commit->parents &&
1f93ecd1 156 (graft = lookup_commit_graft(the_repository, &commit->object.oid)) != NULL &&
79d3a236 157 graft->nr_parent < 0)) {
682c7d2f
NTND
158 commit_list_insert(commit, &result);
159 commit->object.flags |= shallow_flag;
160 commit = NULL;
161 continue;
162 }
163 commit->object.flags |= not_shallow_flag;
ed09aef0 164 for (p = commit->parents, commit = NULL; p; p = p->next) {
58dbe58f
NTND
165 int **depth_slot = commit_depth_at(&depths, p->item);
166 if (!*depth_slot) {
167 *depth_slot = xmalloc(sizeof(int));
168 **depth_slot = cur_depth;
ed09aef0 169 } else {
58dbe58f 170 if (cur_depth >= **depth_slot)
ed09aef0 171 continue;
58dbe58f 172 **depth_slot = cur_depth;
ed09aef0 173 }
4b796951
MK
174 if (p->next)
175 add_object_array(&p->item->object,
176 NULL, &stack);
177 else {
178 commit = p->item;
58dbe58f 179 cur_depth = **commit_depth_at(&depths, commit);
f53514bc 180 }
ed09aef0
JS
181 }
182 }
1df15f8d 183 deep_clear_commit_depth(&depths, free_depth_in_slab);
ed09aef0
JS
184
185 return result;
186}
6035d6aa 187
3d9ff4d7
NTND
188static void show_commit(struct commit *commit, void *data)
189{
190 commit_list_insert(commit, data);
191}
192
193/*
194 * Given rev-list arguments, run rev-list. All reachable commits
195 * except border ones are marked with not_shallow_flag. Border commits
196 * are marked with shallow_flag. The list of border/shallow commits
197 * are also returned.
198 */
199struct commit_list *get_shallow_commits_by_rev_list(int ac, const char **av,
200 int shallow_flag,
201 int not_shallow_flag)
202{
203 struct commit_list *result = NULL, *p;
204 struct commit_list *not_shallow_list = NULL;
205 struct rev_info revs;
206 int both_flags = shallow_flag | not_shallow_flag;
207
208 /*
209 * SHALLOW (excluded) and NOT_SHALLOW (included) should not be
210 * set at this point. But better be safe than sorry.
211 */
212 clear_object_flags(both_flags);
213
c8813487 214 is_repository_shallow(the_repository); /* make sure shallows are read */
3d9ff4d7 215
2abf3503 216 repo_init_revisions(the_repository, &revs, NULL);
3d9ff4d7
NTND
217 save_commit_buffer = 0;
218 setup_revisions(ac, av, &revs, NULL);
219
220 if (prepare_revision_walk(&revs))
221 die("revision walk setup failed");
222 traverse_commit_list(&revs, show_commit, NULL, &not_shallow_list);
223
e34de73c
NTND
224 if (!not_shallow_list)
225 die("no commits selected for shallow requests");
226
3d9ff4d7
NTND
227 /* Mark all reachable commits as NOT_SHALLOW */
228 for (p = not_shallow_list; p; p = p->next)
229 p->item->object.flags |= not_shallow_flag;
230
231 /*
232 * mark border commits SHALLOW + NOT_SHALLOW.
233 * We cannot clear NOT_SHALLOW right now. Imagine border
234 * commit A is processed first, then commit B, whose parent is
235 * A, later. If NOT_SHALLOW on A is cleared at step 1, B
236 * itself is considered border at step 2, which is incorrect.
237 */
238 for (p = not_shallow_list; p; p = p->next) {
239 struct commit *c = p->item;
240 struct commit_list *parent;
241
242 if (parse_commit(c))
243 die("unable to parse commit %s",
244 oid_to_hex(&c->object.oid));
245
246 for (parent = c->parents; parent; parent = parent->next)
247 if (!(parent->item->object.flags & not_shallow_flag)) {
248 c->object.flags |= shallow_flag;
249 commit_list_insert(c, &result);
250 break;
251 }
252 }
253 free_commit_list(not_shallow_list);
254
255 /*
256 * Now we can clean up NOT_SHALLOW on border commits. Having
257 * both flags set can confuse the caller.
258 */
259 for (p = result; p; p = p->next) {
260 struct object *o = &p->item->object;
261 if ((o->flags & both_flags) == both_flags)
262 o->flags &= ~not_shallow_flag;
263 }
264 return result;
265}
266
eee4502b 267static void check_shallow_file_for_update(struct repository *r)
6035d6aa 268{
eee4502b 269 if (r->parsed_objects->is_shallow == -1)
033abf97 270 BUG("shallow must be initialized by now");
6035d6aa 271
34e7771b
NTND
272 if (!stat_validity_check(r->parsed_objects->shallow_stat,
273 git_path_shallow(r)))
0cc77c38 274 die("shallow file has changed since we read it");
6035d6aa 275}
3125fe52 276
eab3296c
NTND
277#define SEEN_ONLY 1
278#define VERBOSE 2
2588f6ed 279#define QUICK 4
eab3296c 280
3125fe52
NTND
281struct write_shallow_data {
282 struct strbuf *out;
283 int use_pack_protocol;
284 int count;
eab3296c 285 unsigned flags;
3125fe52
NTND
286};
287
288static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
289{
290 struct write_shallow_data *data = cb_data;
7683e2e6 291 const char *hex = oid_to_hex(&graft->oid);
6a3bbb4d
NTND
292 if (graft->nr_parent != -1)
293 return 0;
2588f6ed
JS
294 if (data->flags & QUICK) {
295 if (!has_object_file(&graft->oid))
296 return 0;
297 } else if (data->flags & SEEN_ONLY) {
c1f5eb49 298 struct commit *c = lookup_commit(the_repository, &graft->oid);
eab3296c
NTND
299 if (!c || !(c->object.flags & SEEN)) {
300 if (data->flags & VERBOSE)
301 printf("Removing %s from .git/shallow\n",
f2fd0760 302 oid_to_hex(&c->object.oid));
eab3296c
NTND
303 return 0;
304 }
305 }
3125fe52
NTND
306 data->count++;
307 if (data->use_pack_protocol)
308 packet_buf_write(data->out, "shallow %s", hex);
309 else {
310 strbuf_addstr(data->out, hex);
311 strbuf_addch(data->out, '\n');
312 }
313 return 0;
314}
315
eab3296c 316static int write_shallow_commits_1(struct strbuf *out, int use_pack_protocol,
910650d2 317 const struct oid_array *extra,
eab3296c 318 unsigned flags)
3125fe52
NTND
319{
320 struct write_shallow_data data;
1a30f5a2 321 int i;
3125fe52
NTND
322 data.out = out;
323 data.use_pack_protocol = use_pack_protocol;
324 data.count = 0;
eab3296c 325 data.flags = flags;
3125fe52 326 for_each_commit_graft(write_one_shallow, &data);
1a30f5a2
NTND
327 if (!extra)
328 return data.count;
329 for (i = 0; i < extra->nr; i++) {
ee3051bd 330 strbuf_addstr(out, oid_to_hex(extra->oid + i));
1a30f5a2
NTND
331 strbuf_addch(out, '\n');
332 data.count++;
333 }
3125fe52
NTND
334 return data.count;
335}
336
eab3296c 337int write_shallow_commits(struct strbuf *out, int use_pack_protocol,
910650d2 338 const struct oid_array *extra)
eab3296c
NTND
339{
340 return write_shallow_commits_1(out, use_pack_protocol, extra, 0);
341}
342
910650d2 343const char *setup_temporary_shallow(const struct oid_array *extra)
08ea65ad 344{
076aa2cb 345 struct tempfile *temp;
08ea65ad 346 struct strbuf sb = STRBUF_INIT;
08ea65ad 347
1a30f5a2 348 if (write_shallow_commits(&sb, 0, extra)) {
076aa2cb 349 temp = xmks_tempfile(git_path("shallow_XXXXXX"));
0179c945 350
c50424a6 351 if (write_in_full(temp->fd, sb.buf, sb.len) < 0 ||
076aa2cb 352 close_tempfile_gently(temp) < 0)
08ea65ad 353 die_errno("failed to write to %s",
076aa2cb 354 get_tempfile_path(temp));
08ea65ad 355 strbuf_release(&sb);
076aa2cb 356 return get_tempfile_path(temp);
08ea65ad
NTND
357 }
358 /*
359 * is_repository_shallow() sees empty string as "no shallow
360 * file".
361 */
08990139 362 return "";
08ea65ad
NTND
363}
364
cac4b8e2 365void setup_alternate_shallow(struct shallow_lock *shallow_lock,
1a30f5a2 366 const char **alternate_shallow_file,
910650d2 367 const struct oid_array *extra)
3125fe52
NTND
368{
369 struct strbuf sb = STRBUF_INIT;
370 int fd;
371
cac4b8e2 372 fd = hold_lock_file_for_update(&shallow_lock->lock,
102de880 373 git_path_shallow(the_repository),
3125fe52 374 LOCK_DIE_ON_ERROR);
22bdc7c4 375 check_shallow_file_for_update(the_repository);
1a30f5a2 376 if (write_shallow_commits(&sb, 0, extra)) {
06f46f23 377 if (write_in_full(fd, sb.buf, sb.len) < 0)
3125fe52 378 die_errno("failed to write to %s",
cac4b8e2
TB
379 get_lock_file_path(&shallow_lock->lock));
380 *alternate_shallow_file = get_lock_file_path(&shallow_lock->lock);
3125fe52
NTND
381 } else
382 /*
383 * is_repository_shallow() sees empty string as "no
384 * shallow file".
385 */
386 *alternate_shallow_file = "";
387 strbuf_release(&sb);
388}
ad491366
NTND
389
390static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
391{
392 int fd = *(int *)cb;
393 if (graft->nr_parent == -1)
81c634e9 394 packet_write_fmt(fd, "shallow %s\n", oid_to_hex(&graft->oid));
ad491366
NTND
395 return 0;
396}
397
398void advertise_shallow_grafts(int fd)
399{
c8813487 400 if (!is_repository_shallow(the_repository))
ad491366
NTND
401 return;
402 for_each_commit_graft(advertise_shallow_grafts_cb, &fd);
403}
58babfff 404
eab3296c
NTND
405/*
406 * mark_reachable_objects() should have been run prior to this and all
2588f6ed
JS
407 * reachable commits marked as "SEEN", except when quick_prune is non-zero,
408 * in which case lines are excised from the shallow file if they refer to
409 * commits that do not exist (any longer).
eab3296c 410 */
2588f6ed 411void prune_shallow(unsigned options)
eab3296c 412{
cac4b8e2 413 struct shallow_lock shallow_lock = SHALLOW_LOCK_INIT;
eab3296c 414 struct strbuf sb = STRBUF_INIT;
2588f6ed 415 unsigned flags = SEEN_ONLY;
eab3296c
NTND
416 int fd;
417
2588f6ed
JS
418 if (options & PRUNE_QUICK)
419 flags |= QUICK;
420
421 if (options & PRUNE_SHOW_ONLY) {
422 flags |= VERBOSE;
423 write_shallow_commits_1(&sb, 0, NULL, flags);
eab3296c
NTND
424 strbuf_release(&sb);
425 return;
426 }
cac4b8e2 427 fd = hold_lock_file_for_update(&shallow_lock.lock,
102de880 428 git_path_shallow(the_repository),
eab3296c 429 LOCK_DIE_ON_ERROR);
22bdc7c4 430 check_shallow_file_for_update(the_repository);
2588f6ed 431 if (write_shallow_commits_1(&sb, 0, NULL, flags)) {
06f46f23 432 if (write_in_full(fd, sb.buf, sb.len) < 0)
eab3296c 433 die_errno("failed to write to %s",
cac4b8e2 434 get_lock_file_path(&shallow_lock.lock));
37b9dcab 435 commit_shallow_file(the_repository, &shallow_lock);
eab3296c 436 } else {
102de880 437 unlink(git_path_shallow(the_repository));
37b9dcab 438 rollback_shallow_file(the_repository, &shallow_lock);
eab3296c
NTND
439 }
440 strbuf_release(&sb);
441}
442
6aa30857 443struct trace_key trace_shallow = TRACE_KEY_INIT(SHALLOW);
58babfff
NTND
444
445/*
446 * Step 1, split sender shallow commits into "ours" and "theirs"
447 * Step 2, clean "ours" based on .git/shallow
448 */
910650d2 449void prepare_shallow_info(struct shallow_info *info, struct oid_array *sa)
58babfff
NTND
450{
451 int i;
6aa30857 452 trace_printf_key(&trace_shallow, "shallow: prepare_shallow_info\n");
58babfff
NTND
453 memset(info, 0, sizeof(*info));
454 info->shallow = sa;
455 if (!sa)
456 return;
b32fa95f
JK
457 ALLOC_ARRAY(info->ours, sa->nr);
458 ALLOC_ARRAY(info->theirs, sa->nr);
58babfff 459 for (i = 0; i < sa->nr; i++) {
ee3051bd 460 if (has_object_file(sa->oid + i)) {
58babfff 461 struct commit_graft *graft;
1f93ecd1
JN
462 graft = lookup_commit_graft(the_repository,
463 &sa->oid[i]);
58babfff
NTND
464 if (graft && graft->nr_parent < 0)
465 continue;
466 info->ours[info->nr_ours++] = i;
467 } else
468 info->theirs[info->nr_theirs++] = i;
469 }
470}
471
472void clear_shallow_info(struct shallow_info *info)
473{
474 free(info->ours);
475 free(info->theirs);
476}
477
478/* Step 4, remove non-existent ones in "theirs" after getting the pack */
479
480void remove_nonexistent_theirs_shallow(struct shallow_info *info)
481{
ee3051bd 482 struct object_id *oid = info->shallow->oid;
58babfff 483 int i, dst;
6aa30857 484 trace_printf_key(&trace_shallow, "shallow: remove_nonexistent_theirs_shallow\n");
58babfff
NTND
485 for (i = dst = 0; i < info->nr_theirs; i++) {
486 if (i != dst)
487 info->theirs[dst] = info->theirs[i];
ee3051bd 488 if (has_object_file(oid + info->theirs[i]))
58babfff
NTND
489 dst++;
490 }
491 info->nr_theirs = dst;
492}
493
8e277383
NTND
494define_commit_slab(ref_bitmap, uint32_t *);
495
6bc3d8c5
NTND
496#define POOL_SIZE (512 * 1024)
497
8e277383
NTND
498struct paint_info {
499 struct ref_bitmap ref_bitmap;
500 unsigned nr_bits;
0afd307a 501 char **pools;
8e277383 502 char *free, *end;
0afd307a 503 unsigned pool_count;
8e277383
NTND
504};
505
506static uint32_t *paint_alloc(struct paint_info *info)
507{
42c78a21 508 unsigned nr = DIV_ROUND_UP(info->nr_bits, 32);
8e277383
NTND
509 unsigned size = nr * sizeof(uint32_t);
510 void *p;
381aa8e7 511 if (!info->pool_count || size > info->end - info->free) {
f2386c6b 512 if (size > POOL_SIZE)
033abf97 513 BUG("pool size too small for %d in paint_alloc()",
f2386c6b 514 size);
0afd307a
NTND
515 info->pool_count++;
516 REALLOC_ARRAY(info->pools, info->pool_count);
6bc3d8c5 517 info->free = xmalloc(POOL_SIZE);
0afd307a 518 info->pools[info->pool_count - 1] = info->free;
6bc3d8c5 519 info->end = info->free + POOL_SIZE;
8e277383
NTND
520 }
521 p = info->free;
522 info->free += size;
523 return p;
524}
525
526/*
527 * Given a commit SHA-1, walk down to parents until either SEEN,
528 * UNINTERESTING or BOTTOM is hit. Set the id-th bit in ref_bitmap for
529 * all walked commits.
530 */
1e43ed98 531static void paint_down(struct paint_info *info, const struct object_id *oid,
1127b3ce 532 unsigned int id)
8e277383
NTND
533{
534 unsigned int i, nr;
535 struct commit_list *head = NULL;
42c78a21 536 int bitmap_nr = DIV_ROUND_UP(info->nr_bits, 32);
50492f7b 537 size_t bitmap_size = st_mult(sizeof(uint32_t), bitmap_nr);
21e1ee8f
SB
538 struct commit *c = lookup_commit_reference_gently(the_repository, oid,
539 1);
7c565a6b
JS
540 uint32_t *tmp; /* to be freed before return */
541 uint32_t *bitmap;
542
8e277383
NTND
543 if (!c)
544 return;
7c565a6b
JS
545
546 tmp = xmalloc(bitmap_size);
547 bitmap = paint_alloc(info);
8e277383 548 memset(bitmap, 0, bitmap_size);
1127b3ce 549 bitmap[id / 32] |= (1U << (id % 32));
8e277383
NTND
550 commit_list_insert(c, &head);
551 while (head) {
552 struct commit_list *p;
e510ab89 553 struct commit *c = pop_commit(&head);
8e277383
NTND
554 uint32_t **refs = ref_bitmap_at(&info->ref_bitmap, c);
555
8e277383
NTND
556 /* XXX check "UNINTERESTING" from pack bitmaps if available */
557 if (c->object.flags & (SEEN | UNINTERESTING))
558 continue;
559 else
560 c->object.flags |= SEEN;
561
562 if (*refs == NULL)
563 *refs = bitmap;
564 else {
565 memcpy(tmp, *refs, bitmap_size);
566 for (i = 0; i < bitmap_nr; i++)
567 tmp[i] |= bitmap[i];
568 if (memcmp(tmp, *refs, bitmap_size)) {
569 *refs = paint_alloc(info);
570 memcpy(*refs, tmp, bitmap_size);
571 }
572 }
573
574 if (c->object.flags & BOTTOM)
575 continue;
576
577 if (parse_commit(c))
578 die("unable to parse commit %s",
f2fd0760 579 oid_to_hex(&c->object.oid));
8e277383
NTND
580
581 for (p = c->parents; p; p = p->next) {
8e277383
NTND
582 if (p->item->object.flags & SEEN)
583 continue;
8e277383
NTND
584 commit_list_insert(p->item, &head);
585 }
586 }
587
588 nr = get_max_object_index();
589 for (i = 0; i < nr; i++) {
590 struct object *o = get_indexed_object(i);
591 if (o && o->type == OBJ_COMMIT)
592 o->flags &= ~SEEN;
593 }
594
595 free(tmp);
596}
597
580b04ef 598static int mark_uninteresting(const char *refname, const struct object_id *oid,
8e277383
NTND
599 int flags, void *cb_data)
600{
21e1ee8f
SB
601 struct commit *commit = lookup_commit_reference_gently(the_repository,
602 oid, 1);
8e277383
NTND
603 if (!commit)
604 return 0;
605 commit->object.flags |= UNINTERESTING;
606 mark_parents_uninteresting(commit);
607 return 0;
608}
609
610static void post_assign_shallow(struct shallow_info *info,
611 struct ref_bitmap *ref_bitmap,
612 int *ref_status);
613/*
614 * Step 6(+7), associate shallow commits with new refs
615 *
616 * info->ref must be initialized before calling this function.
617 *
618 * If used is not NULL, it's an array of info->shallow->nr
619 * bitmaps. The n-th bit set in the m-th bitmap if ref[n] needs the
620 * m-th shallow commit from info->shallow.
621 *
622 * If used is NULL, "ours" and "theirs" are updated. And if ref_status
623 * is not NULL it's an array of ref->nr ints. ref_status[i] is true if
624 * the ref needs some shallow commits from either info->ours or
625 * info->theirs.
626 */
627void assign_shallow_commits_to_refs(struct shallow_info *info,
628 uint32_t **used, int *ref_status)
629{
ee3051bd 630 struct object_id *oid = info->shallow->oid;
910650d2 631 struct oid_array *ref = info->ref;
8e277383
NTND
632 unsigned int i, nr;
633 int *shallow, nr_shallow = 0;
634 struct paint_info pi;
635
6aa30857 636 trace_printf_key(&trace_shallow, "shallow: assign_shallow_commits_to_refs\n");
b32fa95f 637 ALLOC_ARRAY(shallow, info->nr_ours + info->nr_theirs);
8e277383
NTND
638 for (i = 0; i < info->nr_ours; i++)
639 shallow[nr_shallow++] = info->ours[i];
640 for (i = 0; i < info->nr_theirs; i++)
641 shallow[nr_shallow++] = info->theirs[i];
642
643 /*
644 * Prepare the commit graph to track what refs can reach what
645 * (new) shallow commits.
646 */
647 nr = get_max_object_index();
648 for (i = 0; i < nr; i++) {
649 struct object *o = get_indexed_object(i);
650 if (!o || o->type != OBJ_COMMIT)
651 continue;
652
653 o->flags &= ~(UNINTERESTING | BOTTOM | SEEN);
654 }
655
656 memset(&pi, 0, sizeof(pi));
657 init_ref_bitmap(&pi.ref_bitmap);
658 pi.nr_bits = ref->nr;
659
660 /*
661 * "--not --all" to cut short the traversal if new refs
662 * connect to old refs. If not (e.g. force ref updates) it'll
663 * have to go down to the current shallow commits.
664 */
580b04ef
MH
665 head_ref(mark_uninteresting, NULL);
666 for_each_ref(mark_uninteresting, NULL);
8e277383
NTND
667
668 /* Mark potential bottoms so we won't go out of bound */
669 for (i = 0; i < nr_shallow; i++) {
c1f5eb49
SB
670 struct commit *c = lookup_commit(the_repository,
671 &oid[shallow[i]]);
8e277383
NTND
672 c->object.flags |= BOTTOM;
673 }
674
675 for (i = 0; i < ref->nr; i++)
1e43ed98 676 paint_down(&pi, ref->oid + i, i);
8e277383
NTND
677
678 if (used) {
42c78a21 679 int bitmap_size = DIV_ROUND_UP(pi.nr_bits, 32) * sizeof(uint32_t);
8e277383
NTND
680 memset(used, 0, sizeof(*used) * info->shallow->nr);
681 for (i = 0; i < nr_shallow; i++) {
c1f5eb49
SB
682 const struct commit *c = lookup_commit(the_repository,
683 &oid[shallow[i]]);
8e277383
NTND
684 uint32_t **map = ref_bitmap_at(&pi.ref_bitmap, c);
685 if (*map)
686 used[shallow[i]] = xmemdupz(*map, bitmap_size);
687 }
688 /*
689 * unreachable shallow commits are not removed from
690 * "ours" and "theirs". The user is supposed to run
691 * step 7 on every ref separately and not trust "ours"
692 * and "theirs" any more.
693 */
694 } else
695 post_assign_shallow(info, &pi.ref_bitmap, ref_status);
696
697 clear_ref_bitmap(&pi.ref_bitmap);
0afd307a
NTND
698 for (i = 0; i < pi.pool_count; i++)
699 free(pi.pools[i]);
700 free(pi.pools);
8e277383
NTND
701 free(shallow);
702}
703
704struct commit_array {
705 struct commit **commits;
706 int nr, alloc;
707};
708
580b04ef
MH
709static int add_ref(const char *refname, const struct object_id *oid,
710 int flags, void *cb_data)
8e277383
NTND
711{
712 struct commit_array *ca = cb_data;
713 ALLOC_GROW(ca->commits, ca->nr + 1, ca->alloc);
21e1ee8f
SB
714 ca->commits[ca->nr] = lookup_commit_reference_gently(the_repository,
715 oid, 1);
8e277383
NTND
716 if (ca->commits[ca->nr])
717 ca->nr++;
718 return 0;
719}
720
721static void update_refstatus(int *ref_status, int nr, uint32_t *bitmap)
722{
1127b3ce 723 unsigned int i;
8e277383
NTND
724 if (!ref_status)
725 return;
726 for (i = 0; i < nr; i++)
1127b3ce 727 if (bitmap[i / 32] & (1U << (i % 32)))
8e277383
NTND
728 ref_status[i]++;
729}
730
731/*
732 * Step 7, reachability test on "ours" at commit level
733 */
734static void post_assign_shallow(struct shallow_info *info,
735 struct ref_bitmap *ref_bitmap,
736 int *ref_status)
737{
ee3051bd 738 struct object_id *oid = info->shallow->oid;
8e277383
NTND
739 struct commit *c;
740 uint32_t **bitmap;
741 int dst, i, j;
42c78a21 742 int bitmap_nr = DIV_ROUND_UP(info->ref->nr, 32);
8e277383
NTND
743 struct commit_array ca;
744
6aa30857 745 trace_printf_key(&trace_shallow, "shallow: post_assign_shallow\n");
8e277383
NTND
746 if (ref_status)
747 memset(ref_status, 0, sizeof(*ref_status) * info->ref->nr);
748
749 /* Remove unreachable shallow commits from "theirs" */
750 for (i = dst = 0; i < info->nr_theirs; i++) {
751 if (i != dst)
752 info->theirs[dst] = info->theirs[i];
c1f5eb49 753 c = lookup_commit(the_repository, &oid[info->theirs[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 update_refstatus(ref_status, info->ref->nr, *bitmap);
760 dst++;
761 break;
762 }
763 }
764 info->nr_theirs = dst;
765
766 memset(&ca, 0, sizeof(ca));
580b04ef
MH
767 head_ref(add_ref, &ca);
768 for_each_ref(add_ref, &ca);
8e277383
NTND
769
770 /* Remove unreachable shallow commits from "ours" */
771 for (i = dst = 0; i < info->nr_ours; i++) {
772 if (i != dst)
773 info->ours[dst] = info->ours[i];
c1f5eb49 774 c = lookup_commit(the_repository, &oid[info->ours[i]]);
8e277383
NTND
775 bitmap = ref_bitmap_at(ref_bitmap, c);
776 if (!*bitmap)
777 continue;
778 for (j = 0; j < bitmap_nr; j++)
779 if (bitmap[0][j] &&
780 /* Step 7, reachability test at commit level */
781 !in_merge_bases_many(c, ca.nr, ca.commits)) {
782 update_refstatus(ref_status, info->ref->nr, *bitmap);
783 dst++;
784 break;
785 }
786 }
787 info->nr_ours = dst;
788
789 free(ca.commits);
790}
0a1bc12b
NTND
791
792/* (Delayed) step 7, reachability test at commit level */
793int delayed_reachability_test(struct shallow_info *si, int c)
794{
795 if (si->need_reachability_test[c]) {
c1f5eb49
SB
796 struct commit *commit = lookup_commit(the_repository,
797 &si->shallow->oid[c]);
0a1bc12b
NTND
798
799 if (!si->commits) {
800 struct commit_array ca;
2b2a5be3 801
0a1bc12b 802 memset(&ca, 0, sizeof(ca));
580b04ef
MH
803 head_ref(add_ref, &ca);
804 for_each_ref(add_ref, &ca);
0a1bc12b
NTND
805 si->commits = ca.commits;
806 si->nr_commits = ca.nr;
807 }
808
809 si->reachable[c] = in_merge_bases_many(commit,
810 si->nr_commits,
811 si->commits);
812 si->need_reachability_test[c] = 0;
813 }
814 return si->reachable[c];
815}