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Merge branch 'sb/object-store-lookup'
[git/gitweb.git] / fetch-pack.c
blob5056e22e6d01751eddb17391e5cb68051a5ff9ff
1 #include "cache.h"
2 #include "repository.h"
3 #include "config.h"
4 #include "lockfile.h"
5 #include "refs.h"
6 #include "pkt-line.h"
7 #include "commit.h"
8 #include "tag.h"
9 #include "exec-cmd.h"
10 #include "pack.h"
11 #include "sideband.h"
12 #include "fetch-pack.h"
13 #include "remote.h"
14 #include "run-command.h"
15 #include "connect.h"
16 #include "transport.h"
17 #include "version.h"
18 #include "sha1-array.h"
19 #include "oidset.h"
20 #include "packfile.h"
21 #include "object-store.h"
22 #include "connected.h"
23 #include "fetch-negotiator.h"
24
25 static int transfer_unpack_limit = -1;
26 static int fetch_unpack_limit = -1;
27 static int unpack_limit = 100;
28 static int prefer_ofs_delta = 1;
29 static int no_done;
30 static int deepen_since_ok;
31 static int deepen_not_ok;
32 static int fetch_fsck_objects = -1;
33 static int transfer_fsck_objects = -1;
34 static int agent_supported;
35 static int server_supports_filtering;
36 static struct lock_file shallow_lock;
37 static const char *alternate_shallow_file;
38
39 /* Remember to update object flag allocation in object.h */
40 #define COMPLETE (1U << 0)
41 #define ALTERNATE (1U << 1)
42
43 /*
44 * After sending this many "have"s if we do not get any new ACK , we
45 * give up traversing our history.
46 */
47 #define MAX_IN_VAIN 256
48
49 static int multi_ack, use_sideband;
50 /* Allow specifying sha1 if it is a ref tip. */
51 #define ALLOW_TIP_SHA1 01
52 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
53 #define ALLOW_REACHABLE_SHA1 02
54 static unsigned int allow_unadvertised_object_request;
55
56 __attribute__((format (printf, 2, 3)))
57 static inline void print_verbose(const struct fetch_pack_args *args,
58 const char *fmt, ...)
59 {
60 va_list params;
61
62 if (!args->verbose)
63 return;
64
65 va_start(params, fmt);
66 vfprintf(stderr, fmt, params);
67 va_end(params);
68 fputc('\n', stderr);
69 }
70
71 struct alternate_object_cache {
72 struct object **items;
73 size_t nr, alloc;
74 };
75
76 static void cache_one_alternate(const char *refname,
77 const struct object_id *oid,
78 void *vcache)
79 {
80 struct alternate_object_cache *cache = vcache;
81 struct object *obj = parse_object(the_repository, oid);
82
83 if (!obj || (obj->flags & ALTERNATE))
84 return;
85
86 obj->flags |= ALTERNATE;
87 ALLOC_GROW(cache->items, cache->nr + 1, cache->alloc);
88 cache->items[cache->nr++] = obj;
89 }
90
91 static void for_each_cached_alternate(struct fetch_negotiator *negotiator,
92 void (*cb)(struct fetch_negotiator *,
93 struct object *))
94 {
95 static int initialized;
96 static struct alternate_object_cache cache;
97 size_t i;
98
99 if (!initialized) {
100 for_each_alternate_ref(cache_one_alternate, &cache);
101 initialized = 1;
102 }
103
104 for (i = 0; i < cache.nr; i++)
105 cb(negotiator, cache.items[i]);
106 }
107
108 static int rev_list_insert_ref(struct fetch_negotiator *negotiator,
109 const char *refname,
110 const struct object_id *oid)
111 {
112 struct object *o = deref_tag(the_repository,
113 parse_object(the_repository, oid),
114 refname, 0);
115
116 if (o && o->type == OBJ_COMMIT)
117 negotiator->add_tip(negotiator, (struct commit *)o);
118
119 return 0;
120 }
121
122 static int rev_list_insert_ref_oid(const char *refname, const struct object_id *oid,
123 int flag, void *cb_data)
124 {
125 return rev_list_insert_ref(cb_data, refname, oid);
126 }
127
128 enum ack_type {
129 NAK = 0,
130 ACK,
131 ACK_continue,
132 ACK_common,
133 ACK_ready
134 };
135
136 static void consume_shallow_list(struct fetch_pack_args *args, int fd)
137 {
138 if (args->stateless_rpc && args->deepen) {
139 /* If we sent a depth we will get back "duplicate"
140 * shallow and unshallow commands every time there
141 * is a block of have lines exchanged.
142 */
143 char *line;
144 while ((line = packet_read_line(fd, NULL))) {
145 if (starts_with(line, "shallow "))
146 continue;
147 if (starts_with(line, "unshallow "))
148 continue;
149 die(_("git fetch-pack: expected shallow list"));
150 }
151 }
152 }
153
154 static enum ack_type get_ack(int fd, struct object_id *result_oid)
155 {
156 int len;
157 char *line = packet_read_line(fd, &len);
158 const char *arg;
159
160 if (!line)
161 die(_("git fetch-pack: expected ACK/NAK, got a flush packet"));
162 if (!strcmp(line, "NAK"))
163 return NAK;
164 if (skip_prefix(line, "ACK ", &arg)) {
165 if (!get_oid_hex(arg, result_oid)) {
166 arg += 40;
167 len -= arg - line;
168 if (len < 1)
169 return ACK;
170 if (strstr(arg, "continue"))
171 return ACK_continue;
172 if (strstr(arg, "common"))
173 return ACK_common;
174 if (strstr(arg, "ready"))
175 return ACK_ready;
176 return ACK;
177 }
178 }
179 if (skip_prefix(line, "ERR ", &arg))
180 die(_("remote error: %s"), arg);
181 die(_("git fetch-pack: expected ACK/NAK, got '%s'"), line);
182 }
183
184 static void send_request(struct fetch_pack_args *args,
185 int fd, struct strbuf *buf)
186 {
187 if (args->stateless_rpc) {
188 send_sideband(fd, -1, buf->buf, buf->len, LARGE_PACKET_MAX);
189 packet_flush(fd);
190 } else
191 write_or_die(fd, buf->buf, buf->len);
192 }
193
194 static void insert_one_alternate_object(struct fetch_negotiator *negotiator,
195 struct object *obj)
196 {
197 rev_list_insert_ref(negotiator, NULL, &obj->oid);
198 }
199
200 #define INITIAL_FLUSH 16
201 #define PIPESAFE_FLUSH 32
202 #define LARGE_FLUSH 16384
203
204 static int next_flush(int stateless_rpc, int count)
205 {
206 if (stateless_rpc) {
207 if (count < LARGE_FLUSH)
208 count <<= 1;
209 else
210 count = count * 11 / 10;
211 } else {
212 if (count < PIPESAFE_FLUSH)
213 count <<= 1;
214 else
215 count += PIPESAFE_FLUSH;
216 }
217 return count;
218 }
219
220 static int find_common(struct fetch_negotiator *negotiator,
221 struct fetch_pack_args *args,
222 int fd[2], struct object_id *result_oid,
223 struct ref *refs)
224 {
225 int fetching;
226 int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval;
227 const struct object_id *oid;
228 unsigned in_vain = 0;
229 int got_continue = 0;
230 int got_ready = 0;
231 struct strbuf req_buf = STRBUF_INIT;
232 size_t state_len = 0;
233
234 if (args->stateless_rpc && multi_ack == 1)
235 die(_("--stateless-rpc requires multi_ack_detailed"));
236
237 for_each_ref(rev_list_insert_ref_oid, negotiator);
238 for_each_cached_alternate(negotiator, insert_one_alternate_object);
239
240 fetching = 0;
241 for ( ; refs ; refs = refs->next) {
242 struct object_id *remote = &refs->old_oid;
243 const char *remote_hex;
244 struct object *o;
245
246 /*
247 * If that object is complete (i.e. it is an ancestor of a
248 * local ref), we tell them we have it but do not have to
249 * tell them about its ancestors, which they already know
250 * about.
251 *
252 * We use lookup_object here because we are only
253 * interested in the case we *know* the object is
254 * reachable and we have already scanned it.
255 */
256 if (((o = lookup_object(the_repository, remote->hash)) != NULL) &&
257 (o->flags & COMPLETE)) {
258 continue;
259 }
260
261 remote_hex = oid_to_hex(remote);
262 if (!fetching) {
263 struct strbuf c = STRBUF_INIT;
264 if (multi_ack == 2) strbuf_addstr(&c, " multi_ack_detailed");
265 if (multi_ack == 1) strbuf_addstr(&c, " multi_ack");
266 if (no_done) strbuf_addstr(&c, " no-done");
267 if (use_sideband == 2) strbuf_addstr(&c, " side-band-64k");
268 if (use_sideband == 1) strbuf_addstr(&c, " side-band");
269 if (args->deepen_relative) strbuf_addstr(&c, " deepen-relative");
270 if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack");
271 if (args->no_progress) strbuf_addstr(&c, " no-progress");
272 if (args->include_tag) strbuf_addstr(&c, " include-tag");
273 if (prefer_ofs_delta) strbuf_addstr(&c, " ofs-delta");
274 if (deepen_since_ok) strbuf_addstr(&c, " deepen-since");
275 if (deepen_not_ok) strbuf_addstr(&c, " deepen-not");
276 if (agent_supported) strbuf_addf(&c, " agent=%s",
277 git_user_agent_sanitized());
278 if (args->filter_options.choice)
279 strbuf_addstr(&c, " filter");
280 packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
281 strbuf_release(&c);
282 } else
283 packet_buf_write(&req_buf, "want %s\n", remote_hex);
284 fetching++;
285 }
286
287 if (!fetching) {
288 strbuf_release(&req_buf);
289 packet_flush(fd[1]);
290 return 1;
291 }
292
293 if (is_repository_shallow(the_repository))
294 write_shallow_commits(&req_buf, 1, NULL);
295 if (args->depth > 0)
296 packet_buf_write(&req_buf, "deepen %d", args->depth);
297 if (args->deepen_since) {
298 timestamp_t max_age = approxidate(args->deepen_since);
299 packet_buf_write(&req_buf, "deepen-since %"PRItime, max_age);
300 }
301 if (args->deepen_not) {
302 int i;
303 for (i = 0; i < args->deepen_not->nr; i++) {
304 struct string_list_item *s = args->deepen_not->items + i;
305 packet_buf_write(&req_buf, "deepen-not %s", s->string);
306 }
307 }
308 if (server_supports_filtering && args->filter_options.choice)
309 packet_buf_write(&req_buf, "filter %s",
310 args->filter_options.filter_spec);
311 packet_buf_flush(&req_buf);
312 state_len = req_buf.len;
313
314 if (args->deepen) {
315 char *line;
316 const char *arg;
317 struct object_id oid;
318
319 send_request(args, fd[1], &req_buf);
320 while ((line = packet_read_line(fd[0], NULL))) {
321 if (skip_prefix(line, "shallow ", &arg)) {
322 if (get_oid_hex(arg, &oid))
323 die(_("invalid shallow line: %s"), line);
324 register_shallow(the_repository, &oid);
325 continue;
326 }
327 if (skip_prefix(line, "unshallow ", &arg)) {
328 if (get_oid_hex(arg, &oid))
329 die(_("invalid unshallow line: %s"), line);
330 if (!lookup_object(the_repository, oid.hash))
331 die(_("object not found: %s"), line);
332 /* make sure that it is parsed as shallow */
333 if (!parse_object(the_repository, &oid))
334 die(_("error in object: %s"), line);
335 if (unregister_shallow(&oid))
336 die(_("no shallow found: %s"), line);
337 continue;
338 }
339 die(_("expected shallow/unshallow, got %s"), line);
340 }
341 } else if (!args->stateless_rpc)
342 send_request(args, fd[1], &req_buf);
343
344 if (!args->stateless_rpc) {
345 /* If we aren't using the stateless-rpc interface
346 * we don't need to retain the headers.
347 */
348 strbuf_setlen(&req_buf, 0);
349 state_len = 0;
350 }
351
352 flushes = 0;
353 retval = -1;
354 if (args->no_dependents)
355 goto done;
356 while ((oid = negotiator->next(negotiator))) {
357 packet_buf_write(&req_buf, "have %s\n", oid_to_hex(oid));
358 print_verbose(args, "have %s", oid_to_hex(oid));
359 in_vain++;
360 if (flush_at <= ++count) {
361 int ack;
362
363 packet_buf_flush(&req_buf);
364 send_request(args, fd[1], &req_buf);
365 strbuf_setlen(&req_buf, state_len);
366 flushes++;
367 flush_at = next_flush(args->stateless_rpc, count);
368
369 /*
370 * We keep one window "ahead" of the other side, and
371 * will wait for an ACK only on the next one
372 */
373 if (!args->stateless_rpc && count == INITIAL_FLUSH)
374 continue;
375
376 consume_shallow_list(args, fd[0]);
377 do {
378 ack = get_ack(fd[0], result_oid);
379 if (ack)
380 print_verbose(args, _("got %s %d %s"), "ack",
381 ack, oid_to_hex(result_oid));
382 switch (ack) {
383 case ACK:
384 flushes = 0;
385 multi_ack = 0;
386 retval = 0;
387 goto done;
388 case ACK_common:
389 case ACK_ready:
390 case ACK_continue: {
391 struct commit *commit =
392 lookup_commit(the_repository,
393 result_oid);
394 int was_common;
395
396 if (!commit)
397 die(_("invalid commit %s"), oid_to_hex(result_oid));
398 was_common = negotiator->ack(negotiator, commit);
399 if (args->stateless_rpc
400 && ack == ACK_common
401 && !was_common) {
402 /* We need to replay the have for this object
403 * on the next RPC request so the peer knows
404 * it is in common with us.
405 */
406 const char *hex = oid_to_hex(result_oid);
407 packet_buf_write(&req_buf, "have %s\n", hex);
408 state_len = req_buf.len;
409 /*
410 * Reset in_vain because an ack
411 * for this commit has not been
412 * seen.
413 */
414 in_vain = 0;
415 } else if (!args->stateless_rpc
416 || ack != ACK_common)
417 in_vain = 0;
418 retval = 0;
419 got_continue = 1;
420 if (ack == ACK_ready)
421 got_ready = 1;
422 break;
423 }
424 }
425 } while (ack);
426 flushes--;
427 if (got_continue && MAX_IN_VAIN < in_vain) {
428 print_verbose(args, _("giving up"));
429 break; /* give up */
430 }
431 if (got_ready)
432 break;
433 }
434 }
435 done:
436 if (!got_ready || !no_done) {
437 packet_buf_write(&req_buf, "done\n");
438 send_request(args, fd[1], &req_buf);
439 }
440 print_verbose(args, _("done"));
441 if (retval != 0) {
442 multi_ack = 0;
443 flushes++;
444 }
445 strbuf_release(&req_buf);
446
447 if (!got_ready || !no_done)
448 consume_shallow_list(args, fd[0]);
449 while (flushes || multi_ack) {
450 int ack = get_ack(fd[0], result_oid);
451 if (ack) {
452 print_verbose(args, _("got %s (%d) %s"), "ack",
453 ack, oid_to_hex(result_oid));
454 if (ack == ACK)
455 return 0;
456 multi_ack = 1;
457 continue;
458 }
459 flushes--;
460 }
461 /* it is no error to fetch into a completely empty repo */
462 return count ? retval : 0;
463 }
464
465 static struct commit_list *complete;
466
467 static int mark_complete(const struct object_id *oid)
468 {
469 struct object *o = parse_object(the_repository, oid);
470
471 while (o && o->type == OBJ_TAG) {
472 struct tag *t = (struct tag *) o;
473 if (!t->tagged)
474 break; /* broken repository */
475 o->flags |= COMPLETE;
476 o = parse_object(the_repository, &t->tagged->oid);
477 }
478 if (o && o->type == OBJ_COMMIT) {
479 struct commit *commit = (struct commit *)o;
480 if (!(commit->object.flags & COMPLETE)) {
481 commit->object.flags |= COMPLETE;
482 commit_list_insert(commit, &complete);
483 }
484 }
485 return 0;
486 }
487
488 static int mark_complete_oid(const char *refname, const struct object_id *oid,
489 int flag, void *cb_data)
490 {
491 return mark_complete(oid);
492 }
493
494 static void mark_recent_complete_commits(struct fetch_pack_args *args,
495 timestamp_t cutoff)
496 {
497 while (complete && cutoff <= complete->item->date) {
498 print_verbose(args, _("Marking %s as complete"),
499 oid_to_hex(&complete->item->object.oid));
500 pop_most_recent_commit(&complete, COMPLETE);
501 }
502 }
503
504 static void add_refs_to_oidset(struct oidset *oids, struct ref *refs)
505 {
506 for (; refs; refs = refs->next)
507 oidset_insert(oids, &refs->old_oid);
508 }
509
510 static int tip_oids_contain(struct oidset *tip_oids,
511 struct ref *unmatched, struct ref *newlist,
512 const struct object_id *id)
513 {
514 /*
515 * Note that this only looks at the ref lists the first time it's
516 * called. This works out in filter_refs() because even though it may
517 * add to "newlist" between calls, the additions will always be for
518 * oids that are already in the set.
519 */
520 if (!tip_oids->map.map.tablesize) {
521 add_refs_to_oidset(tip_oids, unmatched);
522 add_refs_to_oidset(tip_oids, newlist);
523 }
524 return oidset_contains(tip_oids, id);
525 }
526
527 static void filter_refs(struct fetch_pack_args *args,
528 struct ref **refs,
529 struct ref **sought, int nr_sought)
530 {
531 struct ref *newlist = NULL;
532 struct ref **newtail = &newlist;
533 struct ref *unmatched = NULL;
534 struct ref *ref, *next;
535 struct oidset tip_oids = OIDSET_INIT;
536 int i;
537
538 i = 0;
539 for (ref = *refs; ref; ref = next) {
540 int keep = 0;
541 next = ref->next;
542
543 if (starts_with(ref->name, "refs/") &&
544 check_refname_format(ref->name, 0))
545 ; /* trash */
546 else {
547 while (i < nr_sought) {
548 int cmp = strcmp(ref->name, sought[i]->name);
549 if (cmp < 0)
550 break; /* definitely do not have it */
551 else if (cmp == 0) {
552 keep = 1; /* definitely have it */
553 sought[i]->match_status = REF_MATCHED;
554 }
555 i++;
556 }
557
558 if (!keep && args->fetch_all &&
559 (!args->deepen || !starts_with(ref->name, "refs/tags/")))
560 keep = 1;
561 }
562
563 if (keep) {
564 *newtail = ref;
565 ref->next = NULL;
566 newtail = &ref->next;
567 } else {
568 ref->next = unmatched;
569 unmatched = ref;
570 }
571 }
572
573 /* Append unmatched requests to the list */
574 for (i = 0; i < nr_sought; i++) {
575 struct object_id oid;
576 const char *p;
577
578 ref = sought[i];
579 if (ref->match_status != REF_NOT_MATCHED)
580 continue;
581 if (parse_oid_hex(ref->name, &oid, &p) ||
582 *p != '\0' ||
583 oidcmp(&oid, &ref->old_oid))
584 continue;
585
586 if ((allow_unadvertised_object_request &
587 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1)) ||
588 tip_oids_contain(&tip_oids, unmatched, newlist,
589 &ref->old_oid)) {
590 ref->match_status = REF_MATCHED;
591 *newtail = copy_ref(ref);
592 newtail = &(*newtail)->next;
593 } else {
594 ref->match_status = REF_UNADVERTISED_NOT_ALLOWED;
595 }
596 }
597
598 oidset_clear(&tip_oids);
599 for (ref = unmatched; ref; ref = next) {
600 next = ref->next;
601 free(ref);
602 }
603
604 *refs = newlist;
605 }
606
607 static void mark_alternate_complete(struct fetch_negotiator *unused,
608 struct object *obj)
609 {
610 mark_complete(&obj->oid);
611 }
612
613 struct loose_object_iter {
614 struct oidset *loose_object_set;
615 struct ref *refs;
616 };
617
618 /*
619 * If the number of refs is not larger than the number of loose objects,
620 * this function stops inserting.
621 */
622 static int add_loose_objects_to_set(const struct object_id *oid,
623 const char *path,
624 void *data)
625 {
626 struct loose_object_iter *iter = data;
627 oidset_insert(iter->loose_object_set, oid);
628 if (iter->refs == NULL)
629 return 1;
630
631 iter->refs = iter->refs->next;
632 return 0;
633 }
634
635 /*
636 * Mark recent commits available locally and reachable from a local ref as
637 * COMPLETE. If args->no_dependents is false, also mark COMPLETE remote refs as
638 * COMMON_REF (otherwise, we are not planning to participate in negotiation, and
639 * thus do not need COMMON_REF marks).
640 *
641 * The cutoff time for recency is determined by this heuristic: it is the
642 * earliest commit time of the objects in refs that are commits and that we know
643 * the commit time of.
644 */
645 static void mark_complete_and_common_ref(struct fetch_negotiator *negotiator,
646 struct fetch_pack_args *args,
647 struct ref **refs)
648 {
649 struct ref *ref;
650 int old_save_commit_buffer = save_commit_buffer;
651 timestamp_t cutoff = 0;
652 struct oidset loose_oid_set = OIDSET_INIT;
653 int use_oidset = 0;
654 struct loose_object_iter iter = {&loose_oid_set, *refs};
655
656 /* Enumerate all loose objects or know refs are not so many. */
657 use_oidset = !for_each_loose_object(add_loose_objects_to_set,
658 &iter, 0);
659
660 save_commit_buffer = 0;
661
662 for (ref = *refs; ref; ref = ref->next) {
663 struct object *o;
664 unsigned int flags = OBJECT_INFO_QUICK;
665
666 if (use_oidset &&
667 !oidset_contains(&loose_oid_set, &ref->old_oid)) {
668 /*
669 * I know this does not exist in the loose form,
670 * so check if it exists in a non-loose form.
671 */
672 flags |= OBJECT_INFO_IGNORE_LOOSE;
673 }
674
675 if (!has_object_file_with_flags(&ref->old_oid, flags))
676 continue;
677 o = parse_object(the_repository, &ref->old_oid);
678 if (!o)
679 continue;
680
681 /* We already have it -- which may mean that we were
682 * in sync with the other side at some time after
683 * that (it is OK if we guess wrong here).
684 */
685 if (o->type == OBJ_COMMIT) {
686 struct commit *commit = (struct commit *)o;
687 if (!cutoff || cutoff < commit->date)
688 cutoff = commit->date;
689 }
690 }
691
692 oidset_clear(&loose_oid_set);
693
694 if (!args->no_dependents) {
695 if (!args->deepen) {
696 for_each_ref(mark_complete_oid, NULL);
697 for_each_cached_alternate(NULL, mark_alternate_complete);
698 commit_list_sort_by_date(&complete);
699 if (cutoff)
700 mark_recent_complete_commits(args, cutoff);
701 }
702
703 /*
704 * Mark all complete remote refs as common refs.
705 * Don't mark them common yet; the server has to be told so first.
706 */
707 for (ref = *refs; ref; ref = ref->next) {
708 struct object *o = deref_tag(the_repository,
709 lookup_object(the_repository,
710 ref->old_oid.hash),
711 NULL, 0);
712
713 if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE))
714 continue;
715
716 negotiator->known_common(negotiator,
717 (struct commit *)o);
718 }
719 }
720
721 save_commit_buffer = old_save_commit_buffer;
722 }
723
724 /*
725 * Returns 1 if every object pointed to by the given remote refs is available
726 * locally and reachable from a local ref, and 0 otherwise.
727 */
728 static int everything_local(struct fetch_pack_args *args,
729 struct ref **refs)
730 {
731 struct ref *ref;
732 int retval;
733
734 for (retval = 1, ref = *refs; ref ; ref = ref->next) {
735 const struct object_id *remote = &ref->old_oid;
736 struct object *o;
737
738 o = lookup_object(the_repository, remote->hash);
739 if (!o || !(o->flags & COMPLETE)) {
740 retval = 0;
741 print_verbose(args, "want %s (%s)", oid_to_hex(remote),
742 ref->name);
743 continue;
744 }
745 print_verbose(args, _("already have %s (%s)"), oid_to_hex(remote),
746 ref->name);
747 }
748
749 return retval;
750 }
751
752 static int sideband_demux(int in, int out, void *data)
753 {
754 int *xd = data;
755 int ret;
756
757 ret = recv_sideband("fetch-pack", xd[0], out);
758 close(out);
759 return ret;
760 }
761
762 static int get_pack(struct fetch_pack_args *args,
763 int xd[2], char **pack_lockfile)
764 {
765 struct async demux;
766 int do_keep = args->keep_pack;
767 const char *cmd_name;
768 struct pack_header header;
769 int pass_header = 0;
770 struct child_process cmd = CHILD_PROCESS_INIT;
771 int ret;
772
773 memset(&demux, 0, sizeof(demux));
774 if (use_sideband) {
775 /* xd[] is talking with upload-pack; subprocess reads from
776 * xd[0], spits out band#2 to stderr, and feeds us band#1
777 * through demux->out.
778 */
779 demux.proc = sideband_demux;
780 demux.data = xd;
781 demux.out = -1;
782 demux.isolate_sigpipe = 1;
783 if (start_async(&demux))
784 die(_("fetch-pack: unable to fork off sideband demultiplexer"));
785 }
786 else
787 demux.out = xd[0];
788
789 if (!args->keep_pack && unpack_limit) {
790
791 if (read_pack_header(demux.out, &header))
792 die(_("protocol error: bad pack header"));
793 pass_header = 1;
794 if (ntohl(header.hdr_entries) < unpack_limit)
795 do_keep = 0;
796 else
797 do_keep = 1;
798 }
799
800 if (alternate_shallow_file) {
801 argv_array_push(&cmd.args, "--shallow-file");
802 argv_array_push(&cmd.args, alternate_shallow_file);
803 }
804
805 if (do_keep || args->from_promisor) {
806 if (pack_lockfile)
807 cmd.out = -1;
808 cmd_name = "index-pack";
809 argv_array_push(&cmd.args, cmd_name);
810 argv_array_push(&cmd.args, "--stdin");
811 if (!args->quiet && !args->no_progress)
812 argv_array_push(&cmd.args, "-v");
813 if (args->use_thin_pack)
814 argv_array_push(&cmd.args, "--fix-thin");
815 if (do_keep && (args->lock_pack || unpack_limit)) {
816 char hostname[HOST_NAME_MAX + 1];
817 if (xgethostname(hostname, sizeof(hostname)))
818 xsnprintf(hostname, sizeof(hostname), "localhost");
819 argv_array_pushf(&cmd.args,
820 "--keep=fetch-pack %"PRIuMAX " on %s",
821 (uintmax_t)getpid(), hostname);
822 }
823 if (args->check_self_contained_and_connected)
824 argv_array_push(&cmd.args, "--check-self-contained-and-connected");
825 if (args->from_promisor)
826 argv_array_push(&cmd.args, "--promisor");
827 }
828 else {
829 cmd_name = "unpack-objects";
830 argv_array_push(&cmd.args, cmd_name);
831 if (args->quiet || args->no_progress)
832 argv_array_push(&cmd.args, "-q");
833 args->check_self_contained_and_connected = 0;
834 }
835
836 if (pass_header)
837 argv_array_pushf(&cmd.args, "--pack_header=%"PRIu32",%"PRIu32,
838 ntohl(header.hdr_version),
839 ntohl(header.hdr_entries));
840 if (fetch_fsck_objects >= 0
841 ? fetch_fsck_objects
842 : transfer_fsck_objects >= 0
843 ? transfer_fsck_objects
844 : 0) {
845 if (args->from_promisor)
846 /*
847 * We cannot use --strict in index-pack because it
848 * checks both broken objects and links, but we only
849 * want to check for broken objects.
850 */
851 argv_array_push(&cmd.args, "--fsck-objects");
852 else
853 argv_array_push(&cmd.args, "--strict");
854 }
855
856 cmd.in = demux.out;
857 cmd.git_cmd = 1;
858 if (start_command(&cmd))
859 die(_("fetch-pack: unable to fork off %s"), cmd_name);
860 if (do_keep && pack_lockfile) {
861 *pack_lockfile = index_pack_lockfile(cmd.out);
862 close(cmd.out);
863 }
864
865 if (!use_sideband)
866 /* Closed by start_command() */
867 xd[0] = -1;
868
869 ret = finish_command(&cmd);
870 if (!ret || (args->check_self_contained_and_connected && ret == 1))
871 args->self_contained_and_connected =
872 args->check_self_contained_and_connected &&
873 ret == 0;
874 else
875 die(_("%s failed"), cmd_name);
876 if (use_sideband && finish_async(&demux))
877 die(_("error in sideband demultiplexer"));
878 return 0;
879 }
880
881 static int cmp_ref_by_name(const void *a_, const void *b_)
882 {
883 const struct ref *a = *((const struct ref **)a_);
884 const struct ref *b = *((const struct ref **)b_);
885 return strcmp(a->name, b->name);
886 }
887
888 static struct ref *do_fetch_pack(struct fetch_pack_args *args,
889 int fd[2],
890 const struct ref *orig_ref,
891 struct ref **sought, int nr_sought,
892 struct shallow_info *si,
893 char **pack_lockfile)
894 {
895 struct ref *ref = copy_ref_list(orig_ref);
896 struct object_id oid;
897 const char *agent_feature;
898 int agent_len;
899 struct fetch_negotiator negotiator;
900 fetch_negotiator_init(&negotiator);
901
902 sort_ref_list(&ref, ref_compare_name);
903 QSORT(sought, nr_sought, cmp_ref_by_name);
904
905 if ((args->depth > 0 || is_repository_shallow(the_repository)) && !server_supports("shallow"))
906 die(_("Server does not support shallow clients"));
907 if (args->depth > 0 || args->deepen_since || args->deepen_not)
908 args->deepen = 1;
909 if (server_supports("multi_ack_detailed")) {
910 print_verbose(args, _("Server supports multi_ack_detailed"));
911 multi_ack = 2;
912 if (server_supports("no-done")) {
913 print_verbose(args, _("Server supports no-done"));
914 if (args->stateless_rpc)
915 no_done = 1;
916 }
917 }
918 else if (server_supports("multi_ack")) {
919 print_verbose(args, _("Server supports multi_ack"));
920 multi_ack = 1;
921 }
922 if (server_supports("side-band-64k")) {
923 print_verbose(args, _("Server supports side-band-64k"));
924 use_sideband = 2;
925 }
926 else if (server_supports("side-band")) {
927 print_verbose(args, _("Server supports side-band"));
928 use_sideband = 1;
929 }
930 if (server_supports("allow-tip-sha1-in-want")) {
931 print_verbose(args, _("Server supports allow-tip-sha1-in-want"));
932 allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
933 }
934 if (server_supports("allow-reachable-sha1-in-want")) {
935 print_verbose(args, _("Server supports allow-reachable-sha1-in-want"));
936 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
937 }
938 if (!server_supports("thin-pack"))
939 args->use_thin_pack = 0;
940 if (!server_supports("no-progress"))
941 args->no_progress = 0;
942 if (!server_supports("include-tag"))
943 args->include_tag = 0;
944 if (server_supports("ofs-delta"))
945 print_verbose(args, _("Server supports ofs-delta"));
946 else
947 prefer_ofs_delta = 0;
948
949 if (server_supports("filter")) {
950 server_supports_filtering = 1;
951 print_verbose(args, _("Server supports filter"));
952 } else if (args->filter_options.choice) {
953 warning("filtering not recognized by server, ignoring");
954 }
955
956 if ((agent_feature = server_feature_value("agent", &agent_len))) {
957 agent_supported = 1;
958 if (agent_len)
959 print_verbose(args, _("Server version is %.*s"),
960 agent_len, agent_feature);
961 }
962 if (server_supports("deepen-since"))
963 deepen_since_ok = 1;
964 else if (args->deepen_since)
965 die(_("Server does not support --shallow-since"));
966 if (server_supports("deepen-not"))
967 deepen_not_ok = 1;
968 else if (args->deepen_not)
969 die(_("Server does not support --shallow-exclude"));
970 if (!server_supports("deepen-relative") && args->deepen_relative)
971 die(_("Server does not support --deepen"));
972
973 mark_complete_and_common_ref(&negotiator, args, &ref);
974 filter_refs(args, &ref, sought, nr_sought);
975 if (everything_local(args, &ref)) {
976 packet_flush(fd[1]);
977 goto all_done;
978 }
979 if (find_common(&negotiator, args, fd, &oid, ref) < 0)
980 if (!args->keep_pack)
981 /* When cloning, it is not unusual to have
982 * no common commit.
983 */
984 warning(_("no common commits"));
985
986 if (args->stateless_rpc)
987 packet_flush(fd[1]);
988 if (args->deepen)
989 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
990 NULL);
991 else if (si->nr_ours || si->nr_theirs)
992 alternate_shallow_file = setup_temporary_shallow(si->shallow);
993 else
994 alternate_shallow_file = NULL;
995 if (get_pack(args, fd, pack_lockfile))
996 die(_("git fetch-pack: fetch failed."));
997
998 all_done:
999 negotiator.release(&negotiator);
1000 return ref;
1001 }
1002
1003 static void add_shallow_requests(struct strbuf *req_buf,
1004 const struct fetch_pack_args *args)
1005 {
1006 if (is_repository_shallow(the_repository))
1007 write_shallow_commits(req_buf, 1, NULL);
1008 if (args->depth > 0)
1009 packet_buf_write(req_buf, "deepen %d", args->depth);
1010 if (args->deepen_since) {
1011 timestamp_t max_age = approxidate(args->deepen_since);
1012 packet_buf_write(req_buf, "deepen-since %"PRItime, max_age);
1013 }
1014 if (args->deepen_not) {
1015 int i;
1016 for (i = 0; i < args->deepen_not->nr; i++) {
1017 struct string_list_item *s = args->deepen_not->items + i;
1018 packet_buf_write(req_buf, "deepen-not %s", s->string);
1019 }
1020 }
1021 }
1022
1023 static void add_wants(const struct ref *wants, struct strbuf *req_buf)
1024 {
1025 int use_ref_in_want = server_supports_feature("fetch", "ref-in-want", 0);
1026
1027 for ( ; wants ; wants = wants->next) {
1028 const struct object_id *remote = &wants->old_oid;
1029 struct object *o;
1030
1031 /*
1032 * If that object is complete (i.e. it is an ancestor of a
1033 * local ref), we tell them we have it but do not have to
1034 * tell them about its ancestors, which they already know
1035 * about.
1036 *
1037 * We use lookup_object here because we are only
1038 * interested in the case we *know* the object is
1039 * reachable and we have already scanned it.
1040 */
1041 if (((o = lookup_object(the_repository, remote->hash)) != NULL) &&
1042 (o->flags & COMPLETE)) {
1043 continue;
1044 }
1045
1046 if (!use_ref_in_want || wants->exact_oid)
1047 packet_buf_write(req_buf, "want %s\n", oid_to_hex(remote));
1048 else
1049 packet_buf_write(req_buf, "want-ref %s\n", wants->name);
1050 }
1051 }
1052
1053 static void add_common(struct strbuf *req_buf, struct oidset *common)
1054 {
1055 struct oidset_iter iter;
1056 const struct object_id *oid;
1057 oidset_iter_init(common, &iter);
1058
1059 while ((oid = oidset_iter_next(&iter))) {
1060 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1061 }
1062 }
1063
1064 static int add_haves(struct fetch_negotiator *negotiator,
1065 struct strbuf *req_buf,
1066 int *haves_to_send, int *in_vain)
1067 {
1068 int ret = 0;
1069 int haves_added = 0;
1070 const struct object_id *oid;
1071
1072 while ((oid = negotiator->next(negotiator))) {
1073 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1074 if (++haves_added >= *haves_to_send)
1075 break;
1076 }
1077
1078 *in_vain += haves_added;
1079 if (!haves_added || *in_vain >= MAX_IN_VAIN) {
1080 /* Send Done */
1081 packet_buf_write(req_buf, "done\n");
1082 ret = 1;
1083 }
1084
1085 /* Increase haves to send on next round */
1086 *haves_to_send = next_flush(1, *haves_to_send);
1087
1088 return ret;
1089 }
1090
1091 static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out,
1092 const struct fetch_pack_args *args,
1093 const struct ref *wants, struct oidset *common,
1094 int *haves_to_send, int *in_vain)
1095 {
1096 int ret = 0;
1097 struct strbuf req_buf = STRBUF_INIT;
1098
1099 if (server_supports_v2("fetch", 1))
1100 packet_buf_write(&req_buf, "command=fetch");
1101 if (server_supports_v2("agent", 0))
1102 packet_buf_write(&req_buf, "agent=%s", git_user_agent_sanitized());
1103 if (args->server_options && args->server_options->nr &&
1104 server_supports_v2("server-option", 1)) {
1105 int i;
1106 for (i = 0; i < args->server_options->nr; i++)
1107 packet_write_fmt(fd_out, "server-option=%s",
1108 args->server_options->items[i].string);
1109 }
1110
1111 packet_buf_delim(&req_buf);
1112 if (args->use_thin_pack)
1113 packet_buf_write(&req_buf, "thin-pack");
1114 if (args->no_progress)
1115 packet_buf_write(&req_buf, "no-progress");
1116 if (args->include_tag)
1117 packet_buf_write(&req_buf, "include-tag");
1118 if (prefer_ofs_delta)
1119 packet_buf_write(&req_buf, "ofs-delta");
1120
1121 /* Add shallow-info and deepen request */
1122 if (server_supports_feature("fetch", "shallow", 0))
1123 add_shallow_requests(&req_buf, args);
1124 else if (is_repository_shallow(the_repository) || args->deepen)
1125 die(_("Server does not support shallow requests"));
1126
1127 /* Add filter */
1128 if (server_supports_feature("fetch", "filter", 0) &&
1129 args->filter_options.choice) {
1130 print_verbose(args, _("Server supports filter"));
1131 packet_buf_write(&req_buf, "filter %s",
1132 args->filter_options.filter_spec);
1133 } else if (args->filter_options.choice) {
1134 warning("filtering not recognized by server, ignoring");
1135 }
1136
1137 /* add wants */
1138 add_wants(wants, &req_buf);
1139
1140 if (args->no_dependents) {
1141 packet_buf_write(&req_buf, "done");
1142 ret = 1;
1143 } else {
1144 /* Add all of the common commits we've found in previous rounds */
1145 add_common(&req_buf, common);
1146
1147 /* Add initial haves */
1148 ret = add_haves(negotiator, &req_buf, haves_to_send, in_vain);
1149 }
1150
1151 /* Send request */
1152 packet_buf_flush(&req_buf);
1153 write_or_die(fd_out, req_buf.buf, req_buf.len);
1154
1155 strbuf_release(&req_buf);
1156 return ret;
1157 }
1158
1159 /*
1160 * Processes a section header in a server's response and checks if it matches
1161 * `section`. If the value of `peek` is 1, the header line will be peeked (and
1162 * not consumed); if 0, the line will be consumed and the function will die if
1163 * the section header doesn't match what was expected.
1164 */
1165 static int process_section_header(struct packet_reader *reader,
1166 const char *section, int peek)
1167 {
1168 int ret;
1169
1170 if (packet_reader_peek(reader) != PACKET_READ_NORMAL)
1171 die("error reading section header '%s'", section);
1172
1173 ret = !strcmp(reader->line, section);
1174
1175 if (!peek) {
1176 if (!ret)
1177 die("expected '%s', received '%s'",
1178 section, reader->line);
1179 packet_reader_read(reader);
1180 }
1181
1182 return ret;
1183 }
1184
1185 static int process_acks(struct fetch_negotiator *negotiator,
1186 struct packet_reader *reader,
1187 struct oidset *common)
1188 {
1189 /* received */
1190 int received_ready = 0;
1191 int received_ack = 0;
1192
1193 process_section_header(reader, "acknowledgments", 0);
1194 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1195 const char *arg;
1196
1197 if (!strcmp(reader->line, "NAK"))
1198 continue;
1199
1200 if (skip_prefix(reader->line, "ACK ", &arg)) {
1201 struct object_id oid;
1202 if (!get_oid_hex(arg, &oid)) {
1203 struct commit *commit;
1204 oidset_insert(common, &oid);
1205 commit = lookup_commit(the_repository, &oid);
1206 negotiator->ack(negotiator, commit);
1207 }
1208 continue;
1209 }
1210
1211 if (!strcmp(reader->line, "ready")) {
1212 received_ready = 1;
1213 continue;
1214 }
1215
1216 die("unexpected acknowledgment line: '%s'", reader->line);
1217 }
1218
1219 if (reader->status != PACKET_READ_FLUSH &&
1220 reader->status != PACKET_READ_DELIM)
1221 die("error processing acks: %d", reader->status);
1222
1223 /* return 0 if no common, 1 if there are common, or 2 if ready */
1224 return received_ready ? 2 : (received_ack ? 1 : 0);
1225 }
1226
1227 static void receive_shallow_info(struct fetch_pack_args *args,
1228 struct packet_reader *reader)
1229 {
1230 process_section_header(reader, "shallow-info", 0);
1231 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1232 const char *arg;
1233 struct object_id oid;
1234
1235 if (skip_prefix(reader->line, "shallow ", &arg)) {
1236 if (get_oid_hex(arg, &oid))
1237 die(_("invalid shallow line: %s"), reader->line);
1238 register_shallow(the_repository, &oid);
1239 continue;
1240 }
1241 if (skip_prefix(reader->line, "unshallow ", &arg)) {
1242 if (get_oid_hex(arg, &oid))
1243 die(_("invalid unshallow line: %s"), reader->line);
1244 if (!lookup_object(the_repository, oid.hash))
1245 die(_("object not found: %s"), reader->line);
1246 /* make sure that it is parsed as shallow */
1247 if (!parse_object(the_repository, &oid))
1248 die(_("error in object: %s"), reader->line);
1249 if (unregister_shallow(&oid))
1250 die(_("no shallow found: %s"), reader->line);
1251 continue;
1252 }
1253 die(_("expected shallow/unshallow, got %s"), reader->line);
1254 }
1255
1256 if (reader->status != PACKET_READ_FLUSH &&
1257 reader->status != PACKET_READ_DELIM)
1258 die("error processing shallow info: %d", reader->status);
1259
1260 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file, NULL);
1261 args->deepen = 1;
1262 }
1263
1264 static void receive_wanted_refs(struct packet_reader *reader, struct ref *refs)
1265 {
1266 process_section_header(reader, "wanted-refs", 0);
1267 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1268 struct object_id oid;
1269 const char *end;
1270 struct ref *r = NULL;
1271
1272 if (parse_oid_hex(reader->line, &oid, &end) || *end++ != ' ')
1273 die("expected wanted-ref, got '%s'", reader->line);
1274
1275 for (r = refs; r; r = r->next) {
1276 if (!strcmp(end, r->name)) {
1277 oidcpy(&r->old_oid, &oid);
1278 break;
1279 }
1280 }
1281
1282 if (!r)
1283 die("unexpected wanted-ref: '%s'", reader->line);
1284 }
1285
1286 if (reader->status != PACKET_READ_DELIM)
1287 die("error processing wanted refs: %d", reader->status);
1288 }
1289
1290 enum fetch_state {
1291 FETCH_CHECK_LOCAL = 0,
1292 FETCH_SEND_REQUEST,
1293 FETCH_PROCESS_ACKS,
1294 FETCH_GET_PACK,
1295 FETCH_DONE,
1296 };
1297
1298 static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
1299 int fd[2],
1300 const struct ref *orig_ref,
1301 struct ref **sought, int nr_sought,
1302 char **pack_lockfile)
1303 {
1304 struct ref *ref = copy_ref_list(orig_ref);
1305 enum fetch_state state = FETCH_CHECK_LOCAL;
1306 struct oidset common = OIDSET_INIT;
1307 struct packet_reader reader;
1308 int in_vain = 0;
1309 int haves_to_send = INITIAL_FLUSH;
1310 struct fetch_negotiator negotiator;
1311 fetch_negotiator_init(&negotiator);
1312 packet_reader_init(&reader, fd[0], NULL, 0,
1313 PACKET_READ_CHOMP_NEWLINE);
1314
1315 while (state != FETCH_DONE) {
1316 switch (state) {
1317 case FETCH_CHECK_LOCAL:
1318 sort_ref_list(&ref, ref_compare_name);
1319 QSORT(sought, nr_sought, cmp_ref_by_name);
1320
1321 /* v2 supports these by default */
1322 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1323 use_sideband = 2;
1324 if (args->depth > 0 || args->deepen_since || args->deepen_not)
1325 args->deepen = 1;
1326
1327 /* Filter 'ref' by 'sought' and those that aren't local */
1328 mark_complete_and_common_ref(&negotiator, args, &ref);
1329 filter_refs(args, &ref, sought, nr_sought);
1330 if (everything_local(args, &ref))
1331 state = FETCH_DONE;
1332 else
1333 state = FETCH_SEND_REQUEST;
1334
1335 for_each_ref(rev_list_insert_ref_oid, &negotiator);
1336 for_each_cached_alternate(&negotiator,
1337 insert_one_alternate_object);
1338 break;
1339 case FETCH_SEND_REQUEST:
1340 if (send_fetch_request(&negotiator, fd[1], args, ref,
1341 &common,
1342 &haves_to_send, &in_vain))
1343 state = FETCH_GET_PACK;
1344 else
1345 state = FETCH_PROCESS_ACKS;
1346 break;
1347 case FETCH_PROCESS_ACKS:
1348 /* Process ACKs/NAKs */
1349 switch (process_acks(&negotiator, &reader, &common)) {
1350 case 2:
1351 state = FETCH_GET_PACK;
1352 break;
1353 case 1:
1354 in_vain = 0;
1355 /* fallthrough */
1356 default:
1357 state = FETCH_SEND_REQUEST;
1358 break;
1359 }
1360 break;
1361 case FETCH_GET_PACK:
1362 /* Check for shallow-info section */
1363 if (process_section_header(&reader, "shallow-info", 1))
1364 receive_shallow_info(args, &reader);
1365
1366 if (process_section_header(&reader, "wanted-refs", 1))
1367 receive_wanted_refs(&reader, ref);
1368
1369 /* get the pack */
1370 process_section_header(&reader, "packfile", 0);
1371 if (get_pack(args, fd, pack_lockfile))
1372 die(_("git fetch-pack: fetch failed."));
1373
1374 state = FETCH_DONE;
1375 break;
1376 case FETCH_DONE:
1377 continue;
1378 }
1379 }
1380
1381 negotiator.release(&negotiator);
1382 oidset_clear(&common);
1383 return ref;
1384 }
1385
1386 static void fetch_pack_config(void)
1387 {
1388 git_config_get_int("fetch.unpacklimit", &fetch_unpack_limit);
1389 git_config_get_int("transfer.unpacklimit", &transfer_unpack_limit);
1390 git_config_get_bool("repack.usedeltabaseoffset", &prefer_ofs_delta);
1391 git_config_get_bool("fetch.fsckobjects", &fetch_fsck_objects);
1392 git_config_get_bool("transfer.fsckobjects", &transfer_fsck_objects);
1393
1394 git_config(git_default_config, NULL);
1395 }
1396
1397 static void fetch_pack_setup(void)
1398 {
1399 static int did_setup;
1400 if (did_setup)
1401 return;
1402 fetch_pack_config();
1403 if (0 <= transfer_unpack_limit)
1404 unpack_limit = transfer_unpack_limit;
1405 else if (0 <= fetch_unpack_limit)
1406 unpack_limit = fetch_unpack_limit;
1407 did_setup = 1;
1408 }
1409
1410 static int remove_duplicates_in_refs(struct ref **ref, int nr)
1411 {
1412 struct string_list names = STRING_LIST_INIT_NODUP;
1413 int src, dst;
1414
1415 for (src = dst = 0; src < nr; src++) {
1416 struct string_list_item *item;
1417 item = string_list_insert(&names, ref[src]->name);
1418 if (item->util)
1419 continue; /* already have it */
1420 item->util = ref[src];
1421 if (src != dst)
1422 ref[dst] = ref[src];
1423 dst++;
1424 }
1425 for (src = dst; src < nr; src++)
1426 ref[src] = NULL;
1427 string_list_clear(&names, 0);
1428 return dst;
1429 }
1430
1431 static void update_shallow(struct fetch_pack_args *args,
1432 struct ref *refs,
1433 struct shallow_info *si)
1434 {
1435 struct oid_array ref = OID_ARRAY_INIT;
1436 int *status;
1437 int i;
1438 struct ref *r;
1439
1440 if (args->deepen && alternate_shallow_file) {
1441 if (*alternate_shallow_file == '\0') { /* --unshallow */
1442 unlink_or_warn(git_path_shallow(the_repository));
1443 rollback_lock_file(&shallow_lock);
1444 } else
1445 commit_lock_file(&shallow_lock);
1446 return;
1447 }
1448
1449 if (!si->shallow || !si->shallow->nr)
1450 return;
1451
1452 if (args->cloning) {
1453 /*
1454 * remote is shallow, but this is a clone, there are
1455 * no objects in repo to worry about. Accept any
1456 * shallow points that exist in the pack (iow in repo
1457 * after get_pack() and reprepare_packed_git())
1458 */
1459 struct oid_array extra = OID_ARRAY_INIT;
1460 struct object_id *oid = si->shallow->oid;
1461 for (i = 0; i < si->shallow->nr; i++)
1462 if (has_object_file(&oid[i]))
1463 oid_array_append(&extra, &oid[i]);
1464 if (extra.nr) {
1465 setup_alternate_shallow(&shallow_lock,
1466 &alternate_shallow_file,
1467 &extra);
1468 commit_lock_file(&shallow_lock);
1469 }
1470 oid_array_clear(&extra);
1471 return;
1472 }
1473
1474 if (!si->nr_ours && !si->nr_theirs)
1475 return;
1476
1477 remove_nonexistent_theirs_shallow(si);
1478 if (!si->nr_ours && !si->nr_theirs)
1479 return;
1480 for (r = refs; r; r = r->next)
1481 oid_array_append(&ref, &r->old_oid);
1482 si->ref = &ref;
1483
1484 if (args->update_shallow) {
1485 /*
1486 * remote is also shallow, .git/shallow may be updated
1487 * so all refs can be accepted. Make sure we only add
1488 * shallow roots that are actually reachable from new
1489 * refs.
1490 */
1491 struct oid_array extra = OID_ARRAY_INIT;
1492 struct object_id *oid = si->shallow->oid;
1493 assign_shallow_commits_to_refs(si, NULL, NULL);
1494 if (!si->nr_ours && !si->nr_theirs) {
1495 oid_array_clear(&ref);
1496 return;
1497 }
1498 for (i = 0; i < si->nr_ours; i++)
1499 oid_array_append(&extra, &oid[si->ours[i]]);
1500 for (i = 0; i < si->nr_theirs; i++)
1501 oid_array_append(&extra, &oid[si->theirs[i]]);
1502 setup_alternate_shallow(&shallow_lock,
1503 &alternate_shallow_file,
1504 &extra);
1505 commit_lock_file(&shallow_lock);
1506 oid_array_clear(&extra);
1507 oid_array_clear(&ref);
1508 return;
1509 }
1510
1511 /*
1512 * remote is also shallow, check what ref is safe to update
1513 * without updating .git/shallow
1514 */
1515 status = xcalloc(ref.nr, sizeof(*status));
1516 assign_shallow_commits_to_refs(si, NULL, status);
1517 if (si->nr_ours || si->nr_theirs) {
1518 for (r = refs, i = 0; r; r = r->next, i++)
1519 if (status[i])
1520 r->status = REF_STATUS_REJECT_SHALLOW;
1521 }
1522 free(status);
1523 oid_array_clear(&ref);
1524 }
1525
1526 static int iterate_ref_map(void *cb_data, struct object_id *oid)
1527 {
1528 struct ref **rm = cb_data;
1529 struct ref *ref = *rm;
1530
1531 if (!ref)
1532 return -1; /* end of the list */
1533 *rm = ref->next;
1534 oidcpy(oid, &ref->old_oid);
1535 return 0;
1536 }
1537
1538 struct ref *fetch_pack(struct fetch_pack_args *args,
1539 int fd[], struct child_process *conn,
1540 const struct ref *ref,
1541 const char *dest,
1542 struct ref **sought, int nr_sought,
1543 struct oid_array *shallow,
1544 char **pack_lockfile,
1545 enum protocol_version version)
1546 {
1547 struct ref *ref_cpy;
1548 struct shallow_info si;
1549
1550 fetch_pack_setup();
1551 if (nr_sought)
1552 nr_sought = remove_duplicates_in_refs(sought, nr_sought);
1553
1554 if (!ref) {
1555 packet_flush(fd[1]);
1556 die(_("no matching remote head"));
1557 }
1558 prepare_shallow_info(&si, shallow);
1559 if (version == protocol_v2)
1560 ref_cpy = do_fetch_pack_v2(args, fd, ref, sought, nr_sought,
1561 pack_lockfile);
1562 else
1563 ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought,
1564 &si, pack_lockfile);
1565 reprepare_packed_git(the_repository);
1566
1567 if (!args->cloning && args->deepen) {
1568 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1569 struct ref *iterator = ref_cpy;
1570 opt.shallow_file = alternate_shallow_file;
1571 if (args->deepen)
1572 opt.is_deepening_fetch = 1;
1573 if (check_connected(iterate_ref_map, &iterator, &opt)) {
1574 error(_("remote did not send all necessary objects"));
1575 free_refs(ref_cpy);
1576 ref_cpy = NULL;
1577 rollback_lock_file(&shallow_lock);
1578 goto cleanup;
1579 }
1580 args->connectivity_checked = 1;
1581 }
1582
1583 update_shallow(args, ref_cpy, &si);
1584 cleanup:
1585 clear_shallow_info(&si);
1586 return ref_cpy;
1587 }
1588
1589 int report_unmatched_refs(struct ref **sought, int nr_sought)
1590 {
1591 int i, ret = 0;
1592
1593 for (i = 0; i < nr_sought; i++) {
1594 if (!sought[i])
1595 continue;
1596 switch (sought[i]->match_status) {
1597 case REF_MATCHED:
1598 continue;
1599 case REF_NOT_MATCHED:
1600 error(_("no such remote ref %s"), sought[i]->name);
1601 break;
1602 case REF_UNADVERTISED_NOT_ALLOWED:
1603 error(_("Server does not allow request for unadvertised object %s"),
1604 sought[i]->name);
1605 break;
1606 }
1607 ret = 1;
1608 }
1609 return ret;
1610 }
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