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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 "oid-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 #include "fsck.h"
25 #include "shallow.h"
26 #include "commit-reach.h"
27 #include "commit-graph.h"
28 #include "sigchain.h"
29
30 static int transfer_unpack_limit = -1;
31 static int fetch_unpack_limit = -1;
32 static int unpack_limit = 100;
33 static int prefer_ofs_delta = 1;
34 static int no_done;
35 static int deepen_since_ok;
36 static int deepen_not_ok;
37 static int fetch_fsck_objects = -1;
38 static int transfer_fsck_objects = -1;
39 static int agent_supported;
40 static int server_supports_filtering;
41 static int advertise_sid;
42 static struct shallow_lock shallow_lock;
43 static const char *alternate_shallow_file;
44 static struct fsck_options fsck_options = FSCK_OPTIONS_MISSING_GITMODULES;
45 static struct strbuf fsck_msg_types = STRBUF_INIT;
46 static struct string_list uri_protocols = STRING_LIST_INIT_DUP;
47
48 /* Remember to update object flag allocation in object.h */
49 #define COMPLETE (1U << 0)
50 #define ALTERNATE (1U << 1)
51 #define COMMON (1U << 6)
52 #define REACH_SCRATCH (1U << 7)
53
54 /*
55 * After sending this many "have"s if we do not get any new ACK , we
56 * give up traversing our history.
57 */
58 #define MAX_IN_VAIN 256
59
60 static int multi_ack, use_sideband;
61 /* Allow specifying sha1 if it is a ref tip. */
62 #define ALLOW_TIP_SHA1 01
63 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
64 #define ALLOW_REACHABLE_SHA1 02
65 static unsigned int allow_unadvertised_object_request;
66
67 __attribute__((format (printf, 2, 3)))
68 static inline void print_verbose(const struct fetch_pack_args *args,
69 const char *fmt, ...)
70 {
71 va_list params;
72
73 if (!args->verbose)
74 return;
75
76 va_start(params, fmt);
77 vfprintf(stderr, fmt, params);
78 va_end(params);
79 fputc('\n', stderr);
80 }
81
82 struct alternate_object_cache {
83 struct object **items;
84 size_t nr, alloc;
85 };
86
87 static void cache_one_alternate(const struct object_id *oid,
88 void *vcache)
89 {
90 struct alternate_object_cache *cache = vcache;
91 struct object *obj = parse_object(the_repository, oid);
92
93 if (!obj || (obj->flags & ALTERNATE))
94 return;
95
96 obj->flags |= ALTERNATE;
97 ALLOC_GROW(cache->items, cache->nr + 1, cache->alloc);
98 cache->items[cache->nr++] = obj;
99 }
100
101 static void for_each_cached_alternate(struct fetch_negotiator *negotiator,
102 void (*cb)(struct fetch_negotiator *,
103 struct object *))
104 {
105 static int initialized;
106 static struct alternate_object_cache cache;
107 size_t i;
108
109 if (!initialized) {
110 for_each_alternate_ref(cache_one_alternate, &cache);
111 initialized = 1;
112 }
113
114 for (i = 0; i < cache.nr; i++)
115 cb(negotiator, cache.items[i]);
116 }
117
118 static struct commit *deref_without_lazy_fetch_extended(const struct object_id *oid,
119 int mark_tags_complete,
120 enum object_type *type,
121 unsigned int oi_flags)
122 {
123 struct object_info info = { .typep = type };
124 struct commit *commit;
125
126 commit = lookup_commit_in_graph(the_repository, oid);
127 if (commit)
128 return commit;
129
130 while (1) {
131 if (oid_object_info_extended(the_repository, oid, &info,
132 oi_flags))
133 return NULL;
134 if (*type == OBJ_TAG) {
135 struct tag *tag = (struct tag *)
136 parse_object(the_repository, oid);
137
138 if (!tag->tagged)
139 return NULL;
140 if (mark_tags_complete)
141 tag->object.flags |= COMPLETE;
142 oid = &tag->tagged->oid;
143 } else {
144 break;
145 }
146 }
147
148 if (*type == OBJ_COMMIT) {
149 struct commit *commit = lookup_commit(the_repository, oid);
150 if (!commit || repo_parse_commit(the_repository, commit))
151 return NULL;
152 return commit;
153 }
154
155 return NULL;
156 }
157
158
159 static struct commit *deref_without_lazy_fetch(const struct object_id *oid,
160 int mark_tags_complete)
161 {
162 enum object_type type;
163 unsigned flags = OBJECT_INFO_SKIP_FETCH_OBJECT | OBJECT_INFO_QUICK;
164 return deref_without_lazy_fetch_extended(oid, mark_tags_complete,
165 &type, flags);
166 }
167
168 static int rev_list_insert_ref(struct fetch_negotiator *negotiator,
169 const struct object_id *oid)
170 {
171 struct commit *c = deref_without_lazy_fetch(oid, 0);
172
173 if (c)
174 negotiator->add_tip(negotiator, c);
175 return 0;
176 }
177
178 static int rev_list_insert_ref_oid(const char *refname, const struct object_id *oid,
179 int flag, void *cb_data)
180 {
181 return rev_list_insert_ref(cb_data, oid);
182 }
183
184 enum ack_type {
185 NAK = 0,
186 ACK,
187 ACK_continue,
188 ACK_common,
189 ACK_ready
190 };
191
192 static void consume_shallow_list(struct fetch_pack_args *args,
193 struct packet_reader *reader)
194 {
195 if (args->stateless_rpc && args->deepen) {
196 /* If we sent a depth we will get back "duplicate"
197 * shallow and unshallow commands every time there
198 * is a block of have lines exchanged.
199 */
200 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
201 if (starts_with(reader->line, "shallow "))
202 continue;
203 if (starts_with(reader->line, "unshallow "))
204 continue;
205 die(_("git fetch-pack: expected shallow list"));
206 }
207 if (reader->status != PACKET_READ_FLUSH)
208 die(_("git fetch-pack: expected a flush packet after shallow list"));
209 }
210 }
211
212 static enum ack_type get_ack(struct packet_reader *reader,
213 struct object_id *result_oid)
214 {
215 int len;
216 const char *arg;
217
218 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
219 die(_("git fetch-pack: expected ACK/NAK, got a flush packet"));
220 len = reader->pktlen;
221
222 if (!strcmp(reader->line, "NAK"))
223 return NAK;
224 if (skip_prefix(reader->line, "ACK ", &arg)) {
225 const char *p;
226 if (!parse_oid_hex(arg, result_oid, &p)) {
227 len -= p - reader->line;
228 if (len < 1)
229 return ACK;
230 if (strstr(p, "continue"))
231 return ACK_continue;
232 if (strstr(p, "common"))
233 return ACK_common;
234 if (strstr(p, "ready"))
235 return ACK_ready;
236 return ACK;
237 }
238 }
239 die(_("git fetch-pack: expected ACK/NAK, got '%s'"), reader->line);
240 }
241
242 static void send_request(struct fetch_pack_args *args,
243 int fd, struct strbuf *buf)
244 {
245 if (args->stateless_rpc) {
246 send_sideband(fd, -1, buf->buf, buf->len, LARGE_PACKET_MAX);
247 packet_flush(fd);
248 } else {
249 if (write_in_full(fd, buf->buf, buf->len) < 0)
250 die_errno(_("unable to write to remote"));
251 }
252 }
253
254 static void insert_one_alternate_object(struct fetch_negotiator *negotiator,
255 struct object *obj)
256 {
257 rev_list_insert_ref(negotiator, &obj->oid);
258 }
259
260 #define INITIAL_FLUSH 16
261 #define PIPESAFE_FLUSH 32
262 #define LARGE_FLUSH 16384
263
264 static int next_flush(int stateless_rpc, int count)
265 {
266 if (stateless_rpc) {
267 if (count < LARGE_FLUSH)
268 count <<= 1;
269 else
270 count = count * 11 / 10;
271 } else {
272 if (count < PIPESAFE_FLUSH)
273 count <<= 1;
274 else
275 count += PIPESAFE_FLUSH;
276 }
277 return count;
278 }
279
280 static void mark_tips(struct fetch_negotiator *negotiator,
281 const struct oid_array *negotiation_tips)
282 {
283 int i;
284
285 if (!negotiation_tips) {
286 for_each_rawref(rev_list_insert_ref_oid, negotiator);
287 return;
288 }
289
290 for (i = 0; i < negotiation_tips->nr; i++)
291 rev_list_insert_ref(negotiator, &negotiation_tips->oid[i]);
292 return;
293 }
294
295 static int find_common(struct fetch_negotiator *negotiator,
296 struct fetch_pack_args *args,
297 int fd[2], struct object_id *result_oid,
298 struct ref *refs)
299 {
300 int fetching;
301 int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval;
302 const struct object_id *oid;
303 unsigned in_vain = 0;
304 int got_continue = 0;
305 int got_ready = 0;
306 struct strbuf req_buf = STRBUF_INIT;
307 size_t state_len = 0;
308 struct packet_reader reader;
309
310 if (args->stateless_rpc && multi_ack == 1)
311 die(_("the option '%s' requires '%s'"), "--stateless-rpc", "multi_ack_detailed");
312
313 packet_reader_init(&reader, fd[0], NULL, 0,
314 PACKET_READ_CHOMP_NEWLINE |
315 PACKET_READ_DIE_ON_ERR_PACKET);
316
317 mark_tips(negotiator, args->negotiation_tips);
318 for_each_cached_alternate(negotiator, insert_one_alternate_object);
319
320 fetching = 0;
321 for ( ; refs ; refs = refs->next) {
322 struct object_id *remote = &refs->old_oid;
323 const char *remote_hex;
324 struct object *o;
325
326 if (!args->refetch) {
327 /*
328 * If that object is complete (i.e. it is an ancestor of a
329 * local ref), we tell them we have it but do not have to
330 * tell them about its ancestors, which they already know
331 * about.
332 *
333 * We use lookup_object here because we are only
334 * interested in the case we *know* the object is
335 * reachable and we have already scanned it.
336 */
337 if (((o = lookup_object(the_repository, remote)) != NULL) &&
338 (o->flags & COMPLETE)) {
339 continue;
340 }
341 }
342
343 remote_hex = oid_to_hex(remote);
344 if (!fetching) {
345 struct strbuf c = STRBUF_INIT;
346 if (multi_ack == 2) strbuf_addstr(&c, " multi_ack_detailed");
347 if (multi_ack == 1) strbuf_addstr(&c, " multi_ack");
348 if (no_done) strbuf_addstr(&c, " no-done");
349 if (use_sideband == 2) strbuf_addstr(&c, " side-band-64k");
350 if (use_sideband == 1) strbuf_addstr(&c, " side-band");
351 if (args->deepen_relative) strbuf_addstr(&c, " deepen-relative");
352 if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack");
353 if (args->no_progress) strbuf_addstr(&c, " no-progress");
354 if (args->include_tag) strbuf_addstr(&c, " include-tag");
355 if (prefer_ofs_delta) strbuf_addstr(&c, " ofs-delta");
356 if (deepen_since_ok) strbuf_addstr(&c, " deepen-since");
357 if (deepen_not_ok) strbuf_addstr(&c, " deepen-not");
358 if (agent_supported) strbuf_addf(&c, " agent=%s",
359 git_user_agent_sanitized());
360 if (advertise_sid)
361 strbuf_addf(&c, " session-id=%s", trace2_session_id());
362 if (args->filter_options.choice)
363 strbuf_addstr(&c, " filter");
364 packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
365 strbuf_release(&c);
366 } else
367 packet_buf_write(&req_buf, "want %s\n", remote_hex);
368 fetching++;
369 }
370
371 if (!fetching) {
372 strbuf_release(&req_buf);
373 packet_flush(fd[1]);
374 return 1;
375 }
376
377 if (is_repository_shallow(the_repository))
378 write_shallow_commits(&req_buf, 1, NULL);
379 if (args->depth > 0)
380 packet_buf_write(&req_buf, "deepen %d", args->depth);
381 if (args->deepen_since) {
382 timestamp_t max_age = approxidate(args->deepen_since);
383 packet_buf_write(&req_buf, "deepen-since %"PRItime, max_age);
384 }
385 if (args->deepen_not) {
386 int i;
387 for (i = 0; i < args->deepen_not->nr; i++) {
388 struct string_list_item *s = args->deepen_not->items + i;
389 packet_buf_write(&req_buf, "deepen-not %s", s->string);
390 }
391 }
392 if (server_supports_filtering && args->filter_options.choice) {
393 const char *spec =
394 expand_list_objects_filter_spec(&args->filter_options);
395 packet_buf_write(&req_buf, "filter %s", spec);
396 }
397 packet_buf_flush(&req_buf);
398 state_len = req_buf.len;
399
400 if (args->deepen) {
401 const char *arg;
402 struct object_id oid;
403
404 send_request(args, fd[1], &req_buf);
405 while (packet_reader_read(&reader) == PACKET_READ_NORMAL) {
406 if (skip_prefix(reader.line, "shallow ", &arg)) {
407 if (get_oid_hex(arg, &oid))
408 die(_("invalid shallow line: %s"), reader.line);
409 register_shallow(the_repository, &oid);
410 continue;
411 }
412 if (skip_prefix(reader.line, "unshallow ", &arg)) {
413 if (get_oid_hex(arg, &oid))
414 die(_("invalid unshallow line: %s"), reader.line);
415 if (!lookup_object(the_repository, &oid))
416 die(_("object not found: %s"), reader.line);
417 /* make sure that it is parsed as shallow */
418 if (!parse_object(the_repository, &oid))
419 die(_("error in object: %s"), reader.line);
420 if (unregister_shallow(&oid))
421 die(_("no shallow found: %s"), reader.line);
422 continue;
423 }
424 die(_("expected shallow/unshallow, got %s"), reader.line);
425 }
426 } else if (!args->stateless_rpc)
427 send_request(args, fd[1], &req_buf);
428
429 if (!args->stateless_rpc) {
430 /* If we aren't using the stateless-rpc interface
431 * we don't need to retain the headers.
432 */
433 strbuf_setlen(&req_buf, 0);
434 state_len = 0;
435 }
436
437 trace2_region_enter("fetch-pack", "negotiation_v0_v1", the_repository);
438 flushes = 0;
439 retval = -1;
440 while ((oid = negotiator->next(negotiator))) {
441 packet_buf_write(&req_buf, "have %s\n", oid_to_hex(oid));
442 print_verbose(args, "have %s", oid_to_hex(oid));
443 in_vain++;
444 if (flush_at <= ++count) {
445 int ack;
446
447 packet_buf_flush(&req_buf);
448 send_request(args, fd[1], &req_buf);
449 strbuf_setlen(&req_buf, state_len);
450 flushes++;
451 flush_at = next_flush(args->stateless_rpc, count);
452
453 /*
454 * We keep one window "ahead" of the other side, and
455 * will wait for an ACK only on the next one
456 */
457 if (!args->stateless_rpc && count == INITIAL_FLUSH)
458 continue;
459
460 consume_shallow_list(args, &reader);
461 do {
462 ack = get_ack(&reader, result_oid);
463 if (ack)
464 print_verbose(args, _("got %s %d %s"), "ack",
465 ack, oid_to_hex(result_oid));
466 switch (ack) {
467 case ACK:
468 flushes = 0;
469 multi_ack = 0;
470 retval = 0;
471 goto done;
472 case ACK_common:
473 case ACK_ready:
474 case ACK_continue: {
475 struct commit *commit =
476 lookup_commit(the_repository,
477 result_oid);
478 int was_common;
479
480 if (!commit)
481 die(_("invalid commit %s"), oid_to_hex(result_oid));
482 was_common = negotiator->ack(negotiator, commit);
483 if (args->stateless_rpc
484 && ack == ACK_common
485 && !was_common) {
486 /* We need to replay the have for this object
487 * on the next RPC request so the peer knows
488 * it is in common with us.
489 */
490 const char *hex = oid_to_hex(result_oid);
491 packet_buf_write(&req_buf, "have %s\n", hex);
492 state_len = req_buf.len;
493 /*
494 * Reset in_vain because an ack
495 * for this commit has not been
496 * seen.
497 */
498 in_vain = 0;
499 } else if (!args->stateless_rpc
500 || ack != ACK_common)
501 in_vain = 0;
502 retval = 0;
503 got_continue = 1;
504 if (ack == ACK_ready)
505 got_ready = 1;
506 break;
507 }
508 }
509 } while (ack);
510 flushes--;
511 if (got_continue && MAX_IN_VAIN < in_vain) {
512 print_verbose(args, _("giving up"));
513 break; /* give up */
514 }
515 if (got_ready)
516 break;
517 }
518 }
519 done:
520 trace2_region_leave("fetch-pack", "negotiation_v0_v1", the_repository);
521 if (!got_ready || !no_done) {
522 packet_buf_write(&req_buf, "done\n");
523 send_request(args, fd[1], &req_buf);
524 }
525 print_verbose(args, _("done"));
526 if (retval != 0) {
527 multi_ack = 0;
528 flushes++;
529 }
530 strbuf_release(&req_buf);
531
532 if (!got_ready || !no_done)
533 consume_shallow_list(args, &reader);
534 while (flushes || multi_ack) {
535 int ack = get_ack(&reader, result_oid);
536 if (ack) {
537 print_verbose(args, _("got %s (%d) %s"), "ack",
538 ack, oid_to_hex(result_oid));
539 if (ack == ACK)
540 return 0;
541 multi_ack = 1;
542 continue;
543 }
544 flushes--;
545 }
546 /* it is no error to fetch into a completely empty repo */
547 return count ? retval : 0;
548 }
549
550 static struct commit_list *complete;
551
552 static int mark_complete(const struct object_id *oid)
553 {
554 struct commit *commit = deref_without_lazy_fetch(oid, 1);
555
556 if (commit && !(commit->object.flags & COMPLETE)) {
557 commit->object.flags |= COMPLETE;
558 commit_list_insert(commit, &complete);
559 }
560 return 0;
561 }
562
563 static int mark_complete_oid(const char *refname, const struct object_id *oid,
564 int flag, void *cb_data)
565 {
566 return mark_complete(oid);
567 }
568
569 static void mark_recent_complete_commits(struct fetch_pack_args *args,
570 timestamp_t cutoff)
571 {
572 while (complete && cutoff <= complete->item->date) {
573 print_verbose(args, _("Marking %s as complete"),
574 oid_to_hex(&complete->item->object.oid));
575 pop_most_recent_commit(&complete, COMPLETE);
576 }
577 }
578
579 static void add_refs_to_oidset(struct oidset *oids, struct ref *refs)
580 {
581 for (; refs; refs = refs->next)
582 oidset_insert(oids, &refs->old_oid);
583 }
584
585 static int is_unmatched_ref(const struct ref *ref)
586 {
587 struct object_id oid;
588 const char *p;
589 return ref->match_status == REF_NOT_MATCHED &&
590 !parse_oid_hex(ref->name, &oid, &p) &&
591 *p == '\0' &&
592 oideq(&oid, &ref->old_oid);
593 }
594
595 static void filter_refs(struct fetch_pack_args *args,
596 struct ref **refs,
597 struct ref **sought, int nr_sought)
598 {
599 struct ref *newlist = NULL;
600 struct ref **newtail = &newlist;
601 struct ref *unmatched = NULL;
602 struct ref *ref, *next;
603 struct oidset tip_oids = OIDSET_INIT;
604 int i;
605 int strict = !(allow_unadvertised_object_request &
606 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
607
608 i = 0;
609 for (ref = *refs; ref; ref = next) {
610 int keep = 0;
611 next = ref->next;
612
613 if (starts_with(ref->name, "refs/") &&
614 check_refname_format(ref->name, 0)) {
615 /*
616 * trash or a peeled value; do not even add it to
617 * unmatched list
618 */
619 free_one_ref(ref);
620 continue;
621 } else {
622 while (i < nr_sought) {
623 int cmp = strcmp(ref->name, sought[i]->name);
624 if (cmp < 0)
625 break; /* definitely do not have it */
626 else if (cmp == 0) {
627 keep = 1; /* definitely have it */
628 sought[i]->match_status = REF_MATCHED;
629 }
630 i++;
631 }
632
633 if (!keep && args->fetch_all &&
634 (!args->deepen || !starts_with(ref->name, "refs/tags/")))
635 keep = 1;
636 }
637
638 if (keep) {
639 *newtail = ref;
640 ref->next = NULL;
641 newtail = &ref->next;
642 } else {
643 ref->next = unmatched;
644 unmatched = ref;
645 }
646 }
647
648 if (strict) {
649 for (i = 0; i < nr_sought; i++) {
650 ref = sought[i];
651 if (!is_unmatched_ref(ref))
652 continue;
653
654 add_refs_to_oidset(&tip_oids, unmatched);
655 add_refs_to_oidset(&tip_oids, newlist);
656 break;
657 }
658 }
659
660 /* Append unmatched requests to the list */
661 for (i = 0; i < nr_sought; i++) {
662 ref = sought[i];
663 if (!is_unmatched_ref(ref))
664 continue;
665
666 if (!strict || oidset_contains(&tip_oids, &ref->old_oid)) {
667 ref->match_status = REF_MATCHED;
668 *newtail = copy_ref(ref);
669 newtail = &(*newtail)->next;
670 } else {
671 ref->match_status = REF_UNADVERTISED_NOT_ALLOWED;
672 }
673 }
674
675 oidset_clear(&tip_oids);
676 free_refs(unmatched);
677
678 *refs = newlist;
679 }
680
681 static void mark_alternate_complete(struct fetch_negotiator *unused,
682 struct object *obj)
683 {
684 mark_complete(&obj->oid);
685 }
686
687 struct loose_object_iter {
688 struct oidset *loose_object_set;
689 struct ref *refs;
690 };
691
692 /*
693 * Mark recent commits available locally and reachable from a local ref as
694 * COMPLETE.
695 *
696 * The cutoff time for recency is determined by this heuristic: it is the
697 * earliest commit time of the objects in refs that are commits and that we know
698 * the commit time of.
699 */
700 static void mark_complete_and_common_ref(struct fetch_negotiator *negotiator,
701 struct fetch_pack_args *args,
702 struct ref **refs)
703 {
704 struct ref *ref;
705 int old_save_commit_buffer = save_commit_buffer;
706 timestamp_t cutoff = 0;
707
708 if (args->refetch)
709 return;
710
711 save_commit_buffer = 0;
712
713 trace2_region_enter("fetch-pack", "parse_remote_refs_and_find_cutoff", NULL);
714 for (ref = *refs; ref; ref = ref->next) {
715 struct commit *commit;
716
717 commit = lookup_commit_in_graph(the_repository, &ref->old_oid);
718 if (!commit) {
719 struct object *o;
720
721 if (!has_object_file_with_flags(&ref->old_oid,
722 OBJECT_INFO_QUICK |
723 OBJECT_INFO_SKIP_FETCH_OBJECT))
724 continue;
725 o = parse_object(the_repository, &ref->old_oid);
726 if (!o || o->type != OBJ_COMMIT)
727 continue;
728
729 commit = (struct commit *)o;
730 }
731
732 /*
733 * We already have it -- which may mean that we were
734 * in sync with the other side at some time after
735 * that (it is OK if we guess wrong here).
736 */
737 if (!cutoff || cutoff < commit->date)
738 cutoff = commit->date;
739 }
740 trace2_region_leave("fetch-pack", "parse_remote_refs_and_find_cutoff", NULL);
741
742 /*
743 * This block marks all local refs as COMPLETE, and then recursively marks all
744 * parents of those refs as COMPLETE.
745 */
746 trace2_region_enter("fetch-pack", "mark_complete_local_refs", NULL);
747 if (!args->deepen) {
748 for_each_rawref(mark_complete_oid, NULL);
749 for_each_cached_alternate(NULL, mark_alternate_complete);
750 commit_list_sort_by_date(&complete);
751 if (cutoff)
752 mark_recent_complete_commits(args, cutoff);
753 }
754 trace2_region_leave("fetch-pack", "mark_complete_local_refs", NULL);
755
756 /*
757 * Mark all complete remote refs as common refs.
758 * Don't mark them common yet; the server has to be told so first.
759 */
760 trace2_region_enter("fetch-pack", "mark_common_remote_refs", NULL);
761 for (ref = *refs; ref; ref = ref->next) {
762 struct commit *c = deref_without_lazy_fetch(&ref->old_oid, 0);
763
764 if (!c || !(c->object.flags & COMPLETE))
765 continue;
766
767 negotiator->known_common(negotiator, c);
768 }
769 trace2_region_leave("fetch-pack", "mark_common_remote_refs", NULL);
770
771 save_commit_buffer = old_save_commit_buffer;
772 }
773
774 /*
775 * Returns 1 if every object pointed to by the given remote refs is available
776 * locally and reachable from a local ref, and 0 otherwise.
777 */
778 static int everything_local(struct fetch_pack_args *args,
779 struct ref **refs)
780 {
781 struct ref *ref;
782 int retval;
783
784 for (retval = 1, ref = *refs; ref ; ref = ref->next) {
785 const struct object_id *remote = &ref->old_oid;
786 struct object *o;
787
788 o = lookup_object(the_repository, remote);
789 if (!o || !(o->flags & COMPLETE)) {
790 retval = 0;
791 print_verbose(args, "want %s (%s)", oid_to_hex(remote),
792 ref->name);
793 continue;
794 }
795 print_verbose(args, _("already have %s (%s)"), oid_to_hex(remote),
796 ref->name);
797 }
798
799 return retval;
800 }
801
802 static int sideband_demux(int in, int out, void *data)
803 {
804 int *xd = data;
805 int ret;
806
807 ret = recv_sideband("fetch-pack", xd[0], out);
808 close(out);
809 return ret;
810 }
811
812 static void create_promisor_file(const char *keep_name,
813 struct ref **sought, int nr_sought)
814 {
815 struct strbuf promisor_name = STRBUF_INIT;
816 int suffix_stripped;
817
818 strbuf_addstr(&promisor_name, keep_name);
819 suffix_stripped = strbuf_strip_suffix(&promisor_name, ".keep");
820 if (!suffix_stripped)
821 BUG("name of pack lockfile should end with .keep (was '%s')",
822 keep_name);
823 strbuf_addstr(&promisor_name, ".promisor");
824
825 write_promisor_file(promisor_name.buf, sought, nr_sought);
826
827 strbuf_release(&promisor_name);
828 }
829
830 static void parse_gitmodules_oids(int fd, struct oidset *gitmodules_oids)
831 {
832 int len = the_hash_algo->hexsz + 1; /* hash + NL */
833
834 do {
835 char hex_hash[GIT_MAX_HEXSZ + 1];
836 int read_len = read_in_full(fd, hex_hash, len);
837 struct object_id oid;
838 const char *end;
839
840 if (!read_len)
841 return;
842 if (read_len != len)
843 die("invalid length read %d", read_len);
844 if (parse_oid_hex(hex_hash, &oid, &end) || *end != '\n')
845 die("invalid hash");
846 oidset_insert(gitmodules_oids, &oid);
847 } while (1);
848 }
849
850 static void add_index_pack_keep_option(struct strvec *args)
851 {
852 char hostname[HOST_NAME_MAX + 1];
853
854 if (xgethostname(hostname, sizeof(hostname)))
855 xsnprintf(hostname, sizeof(hostname), "localhost");
856 strvec_pushf(args, "--keep=fetch-pack %"PRIuMAX " on %s",
857 (uintmax_t)getpid(), hostname);
858 }
859
860 /*
861 * If packfile URIs were provided, pass a non-NULL pointer to index_pack_args.
862 * The strings to pass as the --index-pack-arg arguments to http-fetch will be
863 * stored there. (It must be freed by the caller.)
864 */
865 static int get_pack(struct fetch_pack_args *args,
866 int xd[2], struct string_list *pack_lockfiles,
867 struct strvec *index_pack_args,
868 struct ref **sought, int nr_sought,
869 struct oidset *gitmodules_oids)
870 {
871 struct async demux;
872 int do_keep = args->keep_pack;
873 const char *cmd_name;
874 struct pack_header header;
875 int pass_header = 0;
876 struct child_process cmd = CHILD_PROCESS_INIT;
877 int fsck_objects = 0;
878 int ret;
879
880 memset(&demux, 0, sizeof(demux));
881 if (use_sideband) {
882 /* xd[] is talking with upload-pack; subprocess reads from
883 * xd[0], spits out band#2 to stderr, and feeds us band#1
884 * through demux->out.
885 */
886 demux.proc = sideband_demux;
887 demux.data = xd;
888 demux.out = -1;
889 demux.isolate_sigpipe = 1;
890 if (start_async(&demux))
891 die(_("fetch-pack: unable to fork off sideband demultiplexer"));
892 }
893 else
894 demux.out = xd[0];
895
896 if (!args->keep_pack && unpack_limit && !index_pack_args) {
897
898 if (read_pack_header(demux.out, &header))
899 die(_("protocol error: bad pack header"));
900 pass_header = 1;
901 if (ntohl(header.hdr_entries) < unpack_limit)
902 do_keep = 0;
903 else
904 do_keep = 1;
905 }
906
907 if (alternate_shallow_file) {
908 strvec_push(&cmd.args, "--shallow-file");
909 strvec_push(&cmd.args, alternate_shallow_file);
910 }
911
912 if (fetch_fsck_objects >= 0
913 ? fetch_fsck_objects
914 : transfer_fsck_objects >= 0
915 ? transfer_fsck_objects
916 : 0)
917 fsck_objects = 1;
918
919 if (do_keep || args->from_promisor || index_pack_args || fsck_objects) {
920 if (pack_lockfiles || fsck_objects)
921 cmd.out = -1;
922 cmd_name = "index-pack";
923 strvec_push(&cmd.args, cmd_name);
924 strvec_push(&cmd.args, "--stdin");
925 if (!args->quiet && !args->no_progress)
926 strvec_push(&cmd.args, "-v");
927 if (args->use_thin_pack)
928 strvec_push(&cmd.args, "--fix-thin");
929 if ((do_keep || index_pack_args) && (args->lock_pack || unpack_limit))
930 add_index_pack_keep_option(&cmd.args);
931 if (!index_pack_args && args->check_self_contained_and_connected)
932 strvec_push(&cmd.args, "--check-self-contained-and-connected");
933 else
934 /*
935 * We cannot perform any connectivity checks because
936 * not all packs have been downloaded; let the caller
937 * have this responsibility.
938 */
939 args->check_self_contained_and_connected = 0;
940
941 if (args->from_promisor)
942 /*
943 * create_promisor_file() may be called afterwards but
944 * we still need index-pack to know that this is a
945 * promisor pack. For example, if transfer.fsckobjects
946 * is true, index-pack needs to know that .gitmodules
947 * is a promisor object (so that it won't complain if
948 * it is missing).
949 */
950 strvec_push(&cmd.args, "--promisor");
951 }
952 else {
953 cmd_name = "unpack-objects";
954 strvec_push(&cmd.args, cmd_name);
955 if (args->quiet || args->no_progress)
956 strvec_push(&cmd.args, "-q");
957 args->check_self_contained_and_connected = 0;
958 }
959
960 if (pass_header)
961 strvec_pushf(&cmd.args, "--pack_header=%"PRIu32",%"PRIu32,
962 ntohl(header.hdr_version),
963 ntohl(header.hdr_entries));
964 if (fsck_objects) {
965 if (args->from_promisor || index_pack_args)
966 /*
967 * We cannot use --strict in index-pack because it
968 * checks both broken objects and links, but we only
969 * want to check for broken objects.
970 */
971 strvec_push(&cmd.args, "--fsck-objects");
972 else
973 strvec_pushf(&cmd.args, "--strict%s",
974 fsck_msg_types.buf);
975 }
976
977 if (index_pack_args) {
978 int i;
979
980 for (i = 0; i < cmd.args.nr; i++)
981 strvec_push(index_pack_args, cmd.args.v[i]);
982 }
983
984 sigchain_push(SIGPIPE, SIG_IGN);
985
986 cmd.in = demux.out;
987 cmd.git_cmd = 1;
988 if (start_command(&cmd))
989 die(_("fetch-pack: unable to fork off %s"), cmd_name);
990 if (do_keep && (pack_lockfiles || fsck_objects)) {
991 int is_well_formed;
992 char *pack_lockfile = index_pack_lockfile(cmd.out, &is_well_formed);
993
994 if (!is_well_formed)
995 die(_("fetch-pack: invalid index-pack output"));
996 if (pack_lockfile)
997 string_list_append_nodup(pack_lockfiles, pack_lockfile);
998 parse_gitmodules_oids(cmd.out, gitmodules_oids);
999 close(cmd.out);
1000 }
1001
1002 if (!use_sideband)
1003 /* Closed by start_command() */
1004 xd[0] = -1;
1005
1006 ret = finish_command(&cmd);
1007 if (!ret || (args->check_self_contained_and_connected && ret == 1))
1008 args->self_contained_and_connected =
1009 args->check_self_contained_and_connected &&
1010 ret == 0;
1011 else
1012 die(_("%s failed"), cmd_name);
1013 if (use_sideband && finish_async(&demux))
1014 die(_("error in sideband demultiplexer"));
1015
1016 sigchain_pop(SIGPIPE);
1017
1018 /*
1019 * Now that index-pack has succeeded, write the promisor file using the
1020 * obtained .keep filename if necessary
1021 */
1022 if (do_keep && pack_lockfiles && pack_lockfiles->nr && args->from_promisor)
1023 create_promisor_file(pack_lockfiles->items[0].string, sought, nr_sought);
1024
1025 return 0;
1026 }
1027
1028 static int cmp_ref_by_name(const void *a_, const void *b_)
1029 {
1030 const struct ref *a = *((const struct ref **)a_);
1031 const struct ref *b = *((const struct ref **)b_);
1032 return strcmp(a->name, b->name);
1033 }
1034
1035 static struct ref *do_fetch_pack(struct fetch_pack_args *args,
1036 int fd[2],
1037 const struct ref *orig_ref,
1038 struct ref **sought, int nr_sought,
1039 struct shallow_info *si,
1040 struct string_list *pack_lockfiles)
1041 {
1042 struct repository *r = the_repository;
1043 struct ref *ref = copy_ref_list(orig_ref);
1044 struct object_id oid;
1045 const char *agent_feature;
1046 int agent_len;
1047 struct fetch_negotiator negotiator_alloc;
1048 struct fetch_negotiator *negotiator;
1049
1050 negotiator = &negotiator_alloc;
1051 if (args->refetch) {
1052 fetch_negotiator_init_noop(negotiator);
1053 } else {
1054 fetch_negotiator_init(r, negotiator);
1055 }
1056
1057 sort_ref_list(&ref, ref_compare_name);
1058 QSORT(sought, nr_sought, cmp_ref_by_name);
1059
1060 if ((agent_feature = server_feature_value("agent", &agent_len))) {
1061 agent_supported = 1;
1062 if (agent_len)
1063 print_verbose(args, _("Server version is %.*s"),
1064 agent_len, agent_feature);
1065 }
1066
1067 if (!server_supports("session-id"))
1068 advertise_sid = 0;
1069
1070 if (server_supports("shallow"))
1071 print_verbose(args, _("Server supports %s"), "shallow");
1072 else if (args->depth > 0 || is_repository_shallow(r))
1073 die(_("Server does not support shallow clients"));
1074 if (args->depth > 0 || args->deepen_since || args->deepen_not)
1075 args->deepen = 1;
1076 if (server_supports("multi_ack_detailed")) {
1077 print_verbose(args, _("Server supports %s"), "multi_ack_detailed");
1078 multi_ack = 2;
1079 if (server_supports("no-done")) {
1080 print_verbose(args, _("Server supports %s"), "no-done");
1081 if (args->stateless_rpc)
1082 no_done = 1;
1083 }
1084 }
1085 else if (server_supports("multi_ack")) {
1086 print_verbose(args, _("Server supports %s"), "multi_ack");
1087 multi_ack = 1;
1088 }
1089 if (server_supports("side-band-64k")) {
1090 print_verbose(args, _("Server supports %s"), "side-band-64k");
1091 use_sideband = 2;
1092 }
1093 else if (server_supports("side-band")) {
1094 print_verbose(args, _("Server supports %s"), "side-band");
1095 use_sideband = 1;
1096 }
1097 if (server_supports("allow-tip-sha1-in-want")) {
1098 print_verbose(args, _("Server supports %s"), "allow-tip-sha1-in-want");
1099 allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1100 }
1101 if (server_supports("allow-reachable-sha1-in-want")) {
1102 print_verbose(args, _("Server supports %s"), "allow-reachable-sha1-in-want");
1103 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1104 }
1105 if (server_supports("thin-pack"))
1106 print_verbose(args, _("Server supports %s"), "thin-pack");
1107 else
1108 args->use_thin_pack = 0;
1109 if (server_supports("no-progress"))
1110 print_verbose(args, _("Server supports %s"), "no-progress");
1111 else
1112 args->no_progress = 0;
1113 if (server_supports("include-tag"))
1114 print_verbose(args, _("Server supports %s"), "include-tag");
1115 else
1116 args->include_tag = 0;
1117 if (server_supports("ofs-delta"))
1118 print_verbose(args, _("Server supports %s"), "ofs-delta");
1119 else
1120 prefer_ofs_delta = 0;
1121
1122 if (server_supports("filter")) {
1123 server_supports_filtering = 1;
1124 print_verbose(args, _("Server supports %s"), "filter");
1125 } else if (args->filter_options.choice) {
1126 warning("filtering not recognized by server, ignoring");
1127 }
1128
1129 if (server_supports("deepen-since")) {
1130 print_verbose(args, _("Server supports %s"), "deepen-since");
1131 deepen_since_ok = 1;
1132 } else if (args->deepen_since)
1133 die(_("Server does not support --shallow-since"));
1134 if (server_supports("deepen-not")) {
1135 print_verbose(args, _("Server supports %s"), "deepen-not");
1136 deepen_not_ok = 1;
1137 } else if (args->deepen_not)
1138 die(_("Server does not support --shallow-exclude"));
1139 if (server_supports("deepen-relative"))
1140 print_verbose(args, _("Server supports %s"), "deepen-relative");
1141 else if (args->deepen_relative)
1142 die(_("Server does not support --deepen"));
1143 if (!server_supports_hash(the_hash_algo->name, NULL))
1144 die(_("Server does not support this repository's object format"));
1145
1146 mark_complete_and_common_ref(negotiator, args, &ref);
1147 filter_refs(args, &ref, sought, nr_sought);
1148 if (!args->refetch && everything_local(args, &ref)) {
1149 packet_flush(fd[1]);
1150 goto all_done;
1151 }
1152 if (find_common(negotiator, args, fd, &oid, ref) < 0)
1153 if (!args->keep_pack)
1154 /* When cloning, it is not unusual to have
1155 * no common commit.
1156 */
1157 warning(_("no common commits"));
1158
1159 if (args->stateless_rpc)
1160 packet_flush(fd[1]);
1161 if (args->deepen)
1162 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
1163 NULL);
1164 else if (si->nr_ours || si->nr_theirs) {
1165 if (args->reject_shallow_remote)
1166 die(_("source repository is shallow, reject to clone."));
1167 alternate_shallow_file = setup_temporary_shallow(si->shallow);
1168 } else
1169 alternate_shallow_file = NULL;
1170 if (get_pack(args, fd, pack_lockfiles, NULL, sought, nr_sought,
1171 &fsck_options.gitmodules_found))
1172 die(_("git fetch-pack: fetch failed."));
1173 if (fsck_finish(&fsck_options))
1174 die("fsck failed");
1175
1176 all_done:
1177 if (negotiator)
1178 negotiator->release(negotiator);
1179 return ref;
1180 }
1181
1182 static void add_shallow_requests(struct strbuf *req_buf,
1183 const struct fetch_pack_args *args)
1184 {
1185 if (is_repository_shallow(the_repository))
1186 write_shallow_commits(req_buf, 1, NULL);
1187 if (args->depth > 0)
1188 packet_buf_write(req_buf, "deepen %d", args->depth);
1189 if (args->deepen_since) {
1190 timestamp_t max_age = approxidate(args->deepen_since);
1191 packet_buf_write(req_buf, "deepen-since %"PRItime, max_age);
1192 }
1193 if (args->deepen_not) {
1194 int i;
1195 for (i = 0; i < args->deepen_not->nr; i++) {
1196 struct string_list_item *s = args->deepen_not->items + i;
1197 packet_buf_write(req_buf, "deepen-not %s", s->string);
1198 }
1199 }
1200 if (args->deepen_relative)
1201 packet_buf_write(req_buf, "deepen-relative\n");
1202 }
1203
1204 static void add_wants(const struct ref *wants, struct strbuf *req_buf)
1205 {
1206 int use_ref_in_want = server_supports_feature("fetch", "ref-in-want", 0);
1207
1208 for ( ; wants ; wants = wants->next) {
1209 const struct object_id *remote = &wants->old_oid;
1210 struct object *o;
1211
1212 /*
1213 * If that object is complete (i.e. it is an ancestor of a
1214 * local ref), we tell them we have it but do not have to
1215 * tell them about its ancestors, which they already know
1216 * about.
1217 *
1218 * We use lookup_object here because we are only
1219 * interested in the case we *know* the object is
1220 * reachable and we have already scanned it.
1221 */
1222 if (((o = lookup_object(the_repository, remote)) != NULL) &&
1223 (o->flags & COMPLETE)) {
1224 continue;
1225 }
1226
1227 if (!use_ref_in_want || wants->exact_oid)
1228 packet_buf_write(req_buf, "want %s\n", oid_to_hex(remote));
1229 else
1230 packet_buf_write(req_buf, "want-ref %s\n", wants->name);
1231 }
1232 }
1233
1234 static void add_common(struct strbuf *req_buf, struct oidset *common)
1235 {
1236 struct oidset_iter iter;
1237 const struct object_id *oid;
1238 oidset_iter_init(common, &iter);
1239
1240 while ((oid = oidset_iter_next(&iter))) {
1241 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1242 }
1243 }
1244
1245 static int add_haves(struct fetch_negotiator *negotiator,
1246 struct strbuf *req_buf,
1247 int *haves_to_send)
1248 {
1249 int haves_added = 0;
1250 const struct object_id *oid;
1251
1252 while ((oid = negotiator->next(negotiator))) {
1253 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1254 if (++haves_added >= *haves_to_send)
1255 break;
1256 }
1257
1258 /* Increase haves to send on next round */
1259 *haves_to_send = next_flush(1, *haves_to_send);
1260
1261 return haves_added;
1262 }
1263
1264 static void write_fetch_command_and_capabilities(struct strbuf *req_buf,
1265 const struct string_list *server_options)
1266 {
1267 const char *hash_name;
1268
1269 if (server_supports_v2("fetch", 1))
1270 packet_buf_write(req_buf, "command=fetch");
1271 if (server_supports_v2("agent", 0))
1272 packet_buf_write(req_buf, "agent=%s", git_user_agent_sanitized());
1273 if (advertise_sid && server_supports_v2("session-id", 0))
1274 packet_buf_write(req_buf, "session-id=%s", trace2_session_id());
1275 if (server_options && server_options->nr &&
1276 server_supports_v2("server-option", 1)) {
1277 int i;
1278 for (i = 0; i < server_options->nr; i++)
1279 packet_buf_write(req_buf, "server-option=%s",
1280 server_options->items[i].string);
1281 }
1282
1283 if (server_feature_v2("object-format", &hash_name)) {
1284 int hash_algo = hash_algo_by_name(hash_name);
1285 if (hash_algo_by_ptr(the_hash_algo) != hash_algo)
1286 die(_("mismatched algorithms: client %s; server %s"),
1287 the_hash_algo->name, hash_name);
1288 packet_buf_write(req_buf, "object-format=%s", the_hash_algo->name);
1289 } else if (hash_algo_by_ptr(the_hash_algo) != GIT_HASH_SHA1) {
1290 die(_("the server does not support algorithm '%s'"),
1291 the_hash_algo->name);
1292 }
1293 packet_buf_delim(req_buf);
1294 }
1295
1296 static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out,
1297 struct fetch_pack_args *args,
1298 const struct ref *wants, struct oidset *common,
1299 int *haves_to_send, int *in_vain,
1300 int sideband_all, int seen_ack)
1301 {
1302 int haves_added;
1303 int done_sent = 0;
1304 struct strbuf req_buf = STRBUF_INIT;
1305
1306 write_fetch_command_and_capabilities(&req_buf, args->server_options);
1307
1308 if (args->use_thin_pack)
1309 packet_buf_write(&req_buf, "thin-pack");
1310 if (args->no_progress)
1311 packet_buf_write(&req_buf, "no-progress");
1312 if (args->include_tag)
1313 packet_buf_write(&req_buf, "include-tag");
1314 if (prefer_ofs_delta)
1315 packet_buf_write(&req_buf, "ofs-delta");
1316 if (sideband_all)
1317 packet_buf_write(&req_buf, "sideband-all");
1318
1319 /* Add shallow-info and deepen request */
1320 if (server_supports_feature("fetch", "shallow", 0))
1321 add_shallow_requests(&req_buf, args);
1322 else if (is_repository_shallow(the_repository) || args->deepen)
1323 die(_("Server does not support shallow requests"));
1324
1325 /* Add filter */
1326 if (server_supports_feature("fetch", "filter", 0) &&
1327 args->filter_options.choice) {
1328 const char *spec =
1329 expand_list_objects_filter_spec(&args->filter_options);
1330 print_verbose(args, _("Server supports filter"));
1331 packet_buf_write(&req_buf, "filter %s", spec);
1332 } else if (args->filter_options.choice) {
1333 warning("filtering not recognized by server, ignoring");
1334 }
1335
1336 if (server_supports_feature("fetch", "packfile-uris", 0)) {
1337 int i;
1338 struct strbuf to_send = STRBUF_INIT;
1339
1340 for (i = 0; i < uri_protocols.nr; i++) {
1341 const char *s = uri_protocols.items[i].string;
1342
1343 if (!strcmp(s, "https") || !strcmp(s, "http")) {
1344 if (to_send.len)
1345 strbuf_addch(&to_send, ',');
1346 strbuf_addstr(&to_send, s);
1347 }
1348 }
1349 if (to_send.len) {
1350 packet_buf_write(&req_buf, "packfile-uris %s",
1351 to_send.buf);
1352 strbuf_release(&to_send);
1353 }
1354 }
1355
1356 /* add wants */
1357 add_wants(wants, &req_buf);
1358
1359 /* Add all of the common commits we've found in previous rounds */
1360 add_common(&req_buf, common);
1361
1362 haves_added = add_haves(negotiator, &req_buf, haves_to_send);
1363 *in_vain += haves_added;
1364 if (!haves_added || (seen_ack && *in_vain >= MAX_IN_VAIN)) {
1365 /* Send Done */
1366 packet_buf_write(&req_buf, "done\n");
1367 done_sent = 1;
1368 }
1369
1370 /* Send request */
1371 packet_buf_flush(&req_buf);
1372 if (write_in_full(fd_out, req_buf.buf, req_buf.len) < 0)
1373 die_errno(_("unable to write request to remote"));
1374
1375 strbuf_release(&req_buf);
1376 return done_sent;
1377 }
1378
1379 /*
1380 * Processes a section header in a server's response and checks if it matches
1381 * `section`. If the value of `peek` is 1, the header line will be peeked (and
1382 * not consumed); if 0, the line will be consumed and the function will die if
1383 * the section header doesn't match what was expected.
1384 */
1385 static int process_section_header(struct packet_reader *reader,
1386 const char *section, int peek)
1387 {
1388 int ret = 0;
1389
1390 if (packet_reader_peek(reader) == PACKET_READ_NORMAL &&
1391 !strcmp(reader->line, section))
1392 ret = 1;
1393
1394 if (!peek) {
1395 if (!ret) {
1396 if (reader->line)
1397 die(_("expected '%s', received '%s'"),
1398 section, reader->line);
1399 else
1400 die(_("expected '%s'"), section);
1401 }
1402 packet_reader_read(reader);
1403 }
1404
1405 return ret;
1406 }
1407
1408 static int process_ack(struct fetch_negotiator *negotiator,
1409 struct packet_reader *reader,
1410 struct object_id *common_oid,
1411 int *received_ready)
1412 {
1413 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1414 const char *arg;
1415
1416 if (!strcmp(reader->line, "NAK"))
1417 continue;
1418
1419 if (skip_prefix(reader->line, "ACK ", &arg)) {
1420 if (!get_oid_hex(arg, common_oid)) {
1421 struct commit *commit;
1422 commit = lookup_commit(the_repository, common_oid);
1423 if (negotiator)
1424 negotiator->ack(negotiator, commit);
1425 }
1426 return 1;
1427 }
1428
1429 if (!strcmp(reader->line, "ready")) {
1430 *received_ready = 1;
1431 continue;
1432 }
1433
1434 die(_("unexpected acknowledgment line: '%s'"), reader->line);
1435 }
1436
1437 if (reader->status != PACKET_READ_FLUSH &&
1438 reader->status != PACKET_READ_DELIM)
1439 die(_("error processing acks: %d"), reader->status);
1440
1441 /*
1442 * If an "acknowledgments" section is sent, a packfile is sent if and
1443 * only if "ready" was sent in this section. The other sections
1444 * ("shallow-info" and "wanted-refs") are sent only if a packfile is
1445 * sent. Therefore, a DELIM is expected if "ready" is sent, and a FLUSH
1446 * otherwise.
1447 */
1448 if (*received_ready && reader->status != PACKET_READ_DELIM)
1449 /*
1450 * TRANSLATORS: The parameter will be 'ready', a protocol
1451 * keyword.
1452 */
1453 die(_("expected packfile to be sent after '%s'"), "ready");
1454 if (!*received_ready && reader->status != PACKET_READ_FLUSH)
1455 /*
1456 * TRANSLATORS: The parameter will be 'ready', a protocol
1457 * keyword.
1458 */
1459 die(_("expected no other sections to be sent after no '%s'"), "ready");
1460
1461 return 0;
1462 }
1463
1464 static void receive_shallow_info(struct fetch_pack_args *args,
1465 struct packet_reader *reader,
1466 struct oid_array *shallows,
1467 struct shallow_info *si)
1468 {
1469 int unshallow_received = 0;
1470
1471 process_section_header(reader, "shallow-info", 0);
1472 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1473 const char *arg;
1474 struct object_id oid;
1475
1476 if (skip_prefix(reader->line, "shallow ", &arg)) {
1477 if (get_oid_hex(arg, &oid))
1478 die(_("invalid shallow line: %s"), reader->line);
1479 oid_array_append(shallows, &oid);
1480 continue;
1481 }
1482 if (skip_prefix(reader->line, "unshallow ", &arg)) {
1483 if (get_oid_hex(arg, &oid))
1484 die(_("invalid unshallow line: %s"), reader->line);
1485 if (!lookup_object(the_repository, &oid))
1486 die(_("object not found: %s"), reader->line);
1487 /* make sure that it is parsed as shallow */
1488 if (!parse_object(the_repository, &oid))
1489 die(_("error in object: %s"), reader->line);
1490 if (unregister_shallow(&oid))
1491 die(_("no shallow found: %s"), reader->line);
1492 unshallow_received = 1;
1493 continue;
1494 }
1495 die(_("expected shallow/unshallow, got %s"), reader->line);
1496 }
1497
1498 if (reader->status != PACKET_READ_FLUSH &&
1499 reader->status != PACKET_READ_DELIM)
1500 die(_("error processing shallow info: %d"), reader->status);
1501
1502 if (args->deepen || unshallow_received) {
1503 /*
1504 * Treat these as shallow lines caused by our depth settings.
1505 * In v0, these lines cannot cause refs to be rejected; do the
1506 * same.
1507 */
1508 int i;
1509
1510 for (i = 0; i < shallows->nr; i++)
1511 register_shallow(the_repository, &shallows->oid[i]);
1512 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
1513 NULL);
1514 args->deepen = 1;
1515 } else if (shallows->nr) {
1516 /*
1517 * Treat these as shallow lines caused by the remote being
1518 * shallow. In v0, remote refs that reach these objects are
1519 * rejected (unless --update-shallow is set); do the same.
1520 */
1521 prepare_shallow_info(si, shallows);
1522 if (si->nr_ours || si->nr_theirs) {
1523 if (args->reject_shallow_remote)
1524 die(_("source repository is shallow, reject to clone."));
1525 alternate_shallow_file =
1526 setup_temporary_shallow(si->shallow);
1527 } else
1528 alternate_shallow_file = NULL;
1529 } else {
1530 alternate_shallow_file = NULL;
1531 }
1532 }
1533
1534 static int cmp_name_ref(const void *name, const void *ref)
1535 {
1536 return strcmp(name, (*(struct ref **)ref)->name);
1537 }
1538
1539 static void receive_wanted_refs(struct packet_reader *reader,
1540 struct ref **sought, int nr_sought)
1541 {
1542 process_section_header(reader, "wanted-refs", 0);
1543 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1544 struct object_id oid;
1545 const char *end;
1546 struct ref **found;
1547
1548 if (parse_oid_hex(reader->line, &oid, &end) || *end++ != ' ')
1549 die(_("expected wanted-ref, got '%s'"), reader->line);
1550
1551 found = bsearch(end, sought, nr_sought, sizeof(*sought),
1552 cmp_name_ref);
1553 if (!found)
1554 die(_("unexpected wanted-ref: '%s'"), reader->line);
1555 oidcpy(&(*found)->old_oid, &oid);
1556 }
1557
1558 if (reader->status != PACKET_READ_DELIM)
1559 die(_("error processing wanted refs: %d"), reader->status);
1560 }
1561
1562 static void receive_packfile_uris(struct packet_reader *reader,
1563 struct string_list *uris)
1564 {
1565 process_section_header(reader, "packfile-uris", 0);
1566 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1567 if (reader->pktlen < the_hash_algo->hexsz ||
1568 reader->line[the_hash_algo->hexsz] != ' ')
1569 die("expected '<hash> <uri>', got: %s\n", reader->line);
1570
1571 string_list_append(uris, reader->line);
1572 }
1573 if (reader->status != PACKET_READ_DELIM)
1574 die("expected DELIM");
1575 }
1576
1577 enum fetch_state {
1578 FETCH_CHECK_LOCAL = 0,
1579 FETCH_SEND_REQUEST,
1580 FETCH_PROCESS_ACKS,
1581 FETCH_GET_PACK,
1582 FETCH_DONE,
1583 };
1584
1585 static void do_check_stateless_delimiter(int stateless_rpc,
1586 struct packet_reader *reader)
1587 {
1588 check_stateless_delimiter(stateless_rpc, reader,
1589 _("git fetch-pack: expected response end packet"));
1590 }
1591
1592 static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
1593 int fd[2],
1594 const struct ref *orig_ref,
1595 struct ref **sought, int nr_sought,
1596 struct oid_array *shallows,
1597 struct shallow_info *si,
1598 struct string_list *pack_lockfiles)
1599 {
1600 struct repository *r = the_repository;
1601 struct ref *ref = copy_ref_list(orig_ref);
1602 enum fetch_state state = FETCH_CHECK_LOCAL;
1603 struct oidset common = OIDSET_INIT;
1604 struct packet_reader reader;
1605 int in_vain = 0, negotiation_started = 0;
1606 int haves_to_send = INITIAL_FLUSH;
1607 struct fetch_negotiator negotiator_alloc;
1608 struct fetch_negotiator *negotiator;
1609 int seen_ack = 0;
1610 struct object_id common_oid;
1611 int received_ready = 0;
1612 struct string_list packfile_uris = STRING_LIST_INIT_DUP;
1613 int i;
1614 struct strvec index_pack_args = STRVEC_INIT;
1615
1616 negotiator = &negotiator_alloc;
1617 if (args->refetch)
1618 fetch_negotiator_init_noop(negotiator);
1619 else
1620 fetch_negotiator_init(r, negotiator);
1621
1622 packet_reader_init(&reader, fd[0], NULL, 0,
1623 PACKET_READ_CHOMP_NEWLINE |
1624 PACKET_READ_DIE_ON_ERR_PACKET);
1625 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 1) &&
1626 server_supports_feature("fetch", "sideband-all", 0)) {
1627 reader.use_sideband = 1;
1628 reader.me = "fetch-pack";
1629 }
1630
1631 while (state != FETCH_DONE) {
1632 switch (state) {
1633 case FETCH_CHECK_LOCAL:
1634 sort_ref_list(&ref, ref_compare_name);
1635 QSORT(sought, nr_sought, cmp_ref_by_name);
1636
1637 /* v2 supports these by default */
1638 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1639 use_sideband = 2;
1640 if (args->depth > 0 || args->deepen_since || args->deepen_not)
1641 args->deepen = 1;
1642
1643 /* Filter 'ref' by 'sought' and those that aren't local */
1644 mark_complete_and_common_ref(negotiator, args, &ref);
1645 filter_refs(args, &ref, sought, nr_sought);
1646 if (!args->refetch && everything_local(args, &ref))
1647 state = FETCH_DONE;
1648 else
1649 state = FETCH_SEND_REQUEST;
1650
1651 mark_tips(negotiator, args->negotiation_tips);
1652 for_each_cached_alternate(negotiator,
1653 insert_one_alternate_object);
1654 break;
1655 case FETCH_SEND_REQUEST:
1656 if (!negotiation_started) {
1657 negotiation_started = 1;
1658 trace2_region_enter("fetch-pack",
1659 "negotiation_v2",
1660 the_repository);
1661 }
1662 if (send_fetch_request(negotiator, fd[1], args, ref,
1663 &common,
1664 &haves_to_send, &in_vain,
1665 reader.use_sideband,
1666 seen_ack))
1667 state = FETCH_GET_PACK;
1668 else
1669 state = FETCH_PROCESS_ACKS;
1670 break;
1671 case FETCH_PROCESS_ACKS:
1672 /* Process ACKs/NAKs */
1673 process_section_header(&reader, "acknowledgments", 0);
1674 while (process_ack(negotiator, &reader, &common_oid,
1675 &received_ready)) {
1676 in_vain = 0;
1677 seen_ack = 1;
1678 oidset_insert(&common, &common_oid);
1679 }
1680 if (received_ready) {
1681 /*
1682 * Don't check for response delimiter; get_pack() will
1683 * read the rest of this response.
1684 */
1685 state = FETCH_GET_PACK;
1686 } else {
1687 do_check_stateless_delimiter(args->stateless_rpc, &reader);
1688 state = FETCH_SEND_REQUEST;
1689 }
1690 break;
1691 case FETCH_GET_PACK:
1692 trace2_region_leave("fetch-pack",
1693 "negotiation_v2",
1694 the_repository);
1695 /* Check for shallow-info section */
1696 if (process_section_header(&reader, "shallow-info", 1))
1697 receive_shallow_info(args, &reader, shallows, si);
1698
1699 if (process_section_header(&reader, "wanted-refs", 1))
1700 receive_wanted_refs(&reader, sought, nr_sought);
1701
1702 /* get the pack(s) */
1703 if (git_env_bool("GIT_TRACE_REDACT", 1))
1704 reader.options |= PACKET_READ_REDACT_URI_PATH;
1705 if (process_section_header(&reader, "packfile-uris", 1))
1706 receive_packfile_uris(&reader, &packfile_uris);
1707 /* We don't expect more URIs. Reset to avoid expensive URI check. */
1708 reader.options &= ~PACKET_READ_REDACT_URI_PATH;
1709
1710 process_section_header(&reader, "packfile", 0);
1711
1712 /*
1713 * this is the final request we'll make of the server;
1714 * do a half-duplex shutdown to indicate that they can
1715 * hang up as soon as the pack is sent.
1716 */
1717 close(fd[1]);
1718 fd[1] = -1;
1719
1720 if (get_pack(args, fd, pack_lockfiles,
1721 packfile_uris.nr ? &index_pack_args : NULL,
1722 sought, nr_sought, &fsck_options.gitmodules_found))
1723 die(_("git fetch-pack: fetch failed."));
1724 do_check_stateless_delimiter(args->stateless_rpc, &reader);
1725
1726 state = FETCH_DONE;
1727 break;
1728 case FETCH_DONE:
1729 continue;
1730 }
1731 }
1732
1733 for (i = 0; i < packfile_uris.nr; i++) {
1734 int j;
1735 struct child_process cmd = CHILD_PROCESS_INIT;
1736 char packname[GIT_MAX_HEXSZ + 1];
1737 const char *uri = packfile_uris.items[i].string +
1738 the_hash_algo->hexsz + 1;
1739
1740 strvec_push(&cmd.args, "http-fetch");
1741 strvec_pushf(&cmd.args, "--packfile=%.*s",
1742 (int) the_hash_algo->hexsz,
1743 packfile_uris.items[i].string);
1744 for (j = 0; j < index_pack_args.nr; j++)
1745 strvec_pushf(&cmd.args, "--index-pack-arg=%s",
1746 index_pack_args.v[j]);
1747 strvec_push(&cmd.args, uri);
1748 cmd.git_cmd = 1;
1749 cmd.no_stdin = 1;
1750 cmd.out = -1;
1751 if (start_command(&cmd))
1752 die("fetch-pack: unable to spawn http-fetch");
1753
1754 if (read_in_full(cmd.out, packname, 5) < 0 ||
1755 memcmp(packname, "keep\t", 5))
1756 die("fetch-pack: expected keep then TAB at start of http-fetch output");
1757
1758 if (read_in_full(cmd.out, packname,
1759 the_hash_algo->hexsz + 1) < 0 ||
1760 packname[the_hash_algo->hexsz] != '\n')
1761 die("fetch-pack: expected hash then LF at end of http-fetch output");
1762
1763 packname[the_hash_algo->hexsz] = '\0';
1764
1765 parse_gitmodules_oids(cmd.out, &fsck_options.gitmodules_found);
1766
1767 close(cmd.out);
1768
1769 if (finish_command(&cmd))
1770 die("fetch-pack: unable to finish http-fetch");
1771
1772 if (memcmp(packfile_uris.items[i].string, packname,
1773 the_hash_algo->hexsz))
1774 die("fetch-pack: pack downloaded from %s does not match expected hash %.*s",
1775 uri, (int) the_hash_algo->hexsz,
1776 packfile_uris.items[i].string);
1777
1778 string_list_append_nodup(pack_lockfiles,
1779 xstrfmt("%s/pack/pack-%s.keep",
1780 get_object_directory(),
1781 packname));
1782 }
1783 string_list_clear(&packfile_uris, 0);
1784 strvec_clear(&index_pack_args);
1785
1786 if (fsck_finish(&fsck_options))
1787 die("fsck failed");
1788
1789 if (negotiator)
1790 negotiator->release(negotiator);
1791
1792 oidset_clear(&common);
1793 return ref;
1794 }
1795
1796 static int fetch_pack_config_cb(const char *var, const char *value, void *cb)
1797 {
1798 if (strcmp(var, "fetch.fsck.skiplist") == 0) {
1799 const char *path;
1800
1801 if (git_config_pathname(&path, var, value))
1802 return 1;
1803 strbuf_addf(&fsck_msg_types, "%cskiplist=%s",
1804 fsck_msg_types.len ? ',' : '=', path);
1805 free((char *)path);
1806 return 0;
1807 }
1808
1809 if (skip_prefix(var, "fetch.fsck.", &var)) {
1810 if (is_valid_msg_type(var, value))
1811 strbuf_addf(&fsck_msg_types, "%c%s=%s",
1812 fsck_msg_types.len ? ',' : '=', var, value);
1813 else
1814 warning("Skipping unknown msg id '%s'", var);
1815 return 0;
1816 }
1817
1818 return git_default_config(var, value, cb);
1819 }
1820
1821 static void fetch_pack_config(void)
1822 {
1823 git_config_get_int("fetch.unpacklimit", &fetch_unpack_limit);
1824 git_config_get_int("transfer.unpacklimit", &transfer_unpack_limit);
1825 git_config_get_bool("repack.usedeltabaseoffset", &prefer_ofs_delta);
1826 git_config_get_bool("fetch.fsckobjects", &fetch_fsck_objects);
1827 git_config_get_bool("transfer.fsckobjects", &transfer_fsck_objects);
1828 git_config_get_bool("transfer.advertisesid", &advertise_sid);
1829 if (!uri_protocols.nr) {
1830 char *str;
1831
1832 if (!git_config_get_string("fetch.uriprotocols", &str) && str) {
1833 string_list_split(&uri_protocols, str, ',', -1);
1834 free(str);
1835 }
1836 }
1837
1838 git_config(fetch_pack_config_cb, NULL);
1839 }
1840
1841 static void fetch_pack_setup(void)
1842 {
1843 static int did_setup;
1844 if (did_setup)
1845 return;
1846 fetch_pack_config();
1847 if (0 <= transfer_unpack_limit)
1848 unpack_limit = transfer_unpack_limit;
1849 else if (0 <= fetch_unpack_limit)
1850 unpack_limit = fetch_unpack_limit;
1851 did_setup = 1;
1852 }
1853
1854 static int remove_duplicates_in_refs(struct ref **ref, int nr)
1855 {
1856 struct string_list names = STRING_LIST_INIT_NODUP;
1857 int src, dst;
1858
1859 for (src = dst = 0; src < nr; src++) {
1860 struct string_list_item *item;
1861 item = string_list_insert(&names, ref[src]->name);
1862 if (item->util)
1863 continue; /* already have it */
1864 item->util = ref[src];
1865 if (src != dst)
1866 ref[dst] = ref[src];
1867 dst++;
1868 }
1869 for (src = dst; src < nr; src++)
1870 ref[src] = NULL;
1871 string_list_clear(&names, 0);
1872 return dst;
1873 }
1874
1875 static void update_shallow(struct fetch_pack_args *args,
1876 struct ref **sought, int nr_sought,
1877 struct shallow_info *si)
1878 {
1879 struct oid_array ref = OID_ARRAY_INIT;
1880 int *status;
1881 int i;
1882
1883 if (args->deepen && alternate_shallow_file) {
1884 if (*alternate_shallow_file == '\0') { /* --unshallow */
1885 unlink_or_warn(git_path_shallow(the_repository));
1886 rollback_shallow_file(the_repository, &shallow_lock);
1887 } else
1888 commit_shallow_file(the_repository, &shallow_lock);
1889 alternate_shallow_file = NULL;
1890 return;
1891 }
1892
1893 if (!si->shallow || !si->shallow->nr)
1894 return;
1895
1896 if (args->cloning) {
1897 /*
1898 * remote is shallow, but this is a clone, there are
1899 * no objects in repo to worry about. Accept any
1900 * shallow points that exist in the pack (iow in repo
1901 * after get_pack() and reprepare_packed_git())
1902 */
1903 struct oid_array extra = OID_ARRAY_INIT;
1904 struct object_id *oid = si->shallow->oid;
1905 for (i = 0; i < si->shallow->nr; i++)
1906 if (has_object_file(&oid[i]))
1907 oid_array_append(&extra, &oid[i]);
1908 if (extra.nr) {
1909 setup_alternate_shallow(&shallow_lock,
1910 &alternate_shallow_file,
1911 &extra);
1912 commit_shallow_file(the_repository, &shallow_lock);
1913 alternate_shallow_file = NULL;
1914 }
1915 oid_array_clear(&extra);
1916 return;
1917 }
1918
1919 if (!si->nr_ours && !si->nr_theirs)
1920 return;
1921
1922 remove_nonexistent_theirs_shallow(si);
1923 if (!si->nr_ours && !si->nr_theirs)
1924 return;
1925 for (i = 0; i < nr_sought; i++)
1926 oid_array_append(&ref, &sought[i]->old_oid);
1927 si->ref = &ref;
1928
1929 if (args->update_shallow) {
1930 /*
1931 * remote is also shallow, .git/shallow may be updated
1932 * so all refs can be accepted. Make sure we only add
1933 * shallow roots that are actually reachable from new
1934 * refs.
1935 */
1936 struct oid_array extra = OID_ARRAY_INIT;
1937 struct object_id *oid = si->shallow->oid;
1938 assign_shallow_commits_to_refs(si, NULL, NULL);
1939 if (!si->nr_ours && !si->nr_theirs) {
1940 oid_array_clear(&ref);
1941 return;
1942 }
1943 for (i = 0; i < si->nr_ours; i++)
1944 oid_array_append(&extra, &oid[si->ours[i]]);
1945 for (i = 0; i < si->nr_theirs; i++)
1946 oid_array_append(&extra, &oid[si->theirs[i]]);
1947 setup_alternate_shallow(&shallow_lock,
1948 &alternate_shallow_file,
1949 &extra);
1950 commit_shallow_file(the_repository, &shallow_lock);
1951 oid_array_clear(&extra);
1952 oid_array_clear(&ref);
1953 alternate_shallow_file = NULL;
1954 return;
1955 }
1956
1957 /*
1958 * remote is also shallow, check what ref is safe to update
1959 * without updating .git/shallow
1960 */
1961 CALLOC_ARRAY(status, nr_sought);
1962 assign_shallow_commits_to_refs(si, NULL, status);
1963 if (si->nr_ours || si->nr_theirs) {
1964 for (i = 0; i < nr_sought; i++)
1965 if (status[i])
1966 sought[i]->status = REF_STATUS_REJECT_SHALLOW;
1967 }
1968 free(status);
1969 oid_array_clear(&ref);
1970 }
1971
1972 static const struct object_id *iterate_ref_map(void *cb_data)
1973 {
1974 struct ref **rm = cb_data;
1975 struct ref *ref = *rm;
1976
1977 if (!ref)
1978 return NULL;
1979 *rm = ref->next;
1980 return &ref->old_oid;
1981 }
1982
1983 struct ref *fetch_pack(struct fetch_pack_args *args,
1984 int fd[],
1985 const struct ref *ref,
1986 struct ref **sought, int nr_sought,
1987 struct oid_array *shallow,
1988 struct string_list *pack_lockfiles,
1989 enum protocol_version version)
1990 {
1991 struct ref *ref_cpy;
1992 struct shallow_info si;
1993 struct oid_array shallows_scratch = OID_ARRAY_INIT;
1994
1995 fetch_pack_setup();
1996 if (nr_sought)
1997 nr_sought = remove_duplicates_in_refs(sought, nr_sought);
1998
1999 if (version != protocol_v2 && !ref) {
2000 packet_flush(fd[1]);
2001 die(_("no matching remote head"));
2002 }
2003 if (version == protocol_v2) {
2004 if (shallow->nr)
2005 BUG("Protocol V2 does not provide shallows at this point in the fetch");
2006 memset(&si, 0, sizeof(si));
2007 ref_cpy = do_fetch_pack_v2(args, fd, ref, sought, nr_sought,
2008 &shallows_scratch, &si,
2009 pack_lockfiles);
2010 } else {
2011 prepare_shallow_info(&si, shallow);
2012 ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought,
2013 &si, pack_lockfiles);
2014 }
2015 reprepare_packed_git(the_repository);
2016
2017 if (!args->cloning && args->deepen) {
2018 struct check_connected_options opt = CHECK_CONNECTED_INIT;
2019 struct ref *iterator = ref_cpy;
2020 opt.shallow_file = alternate_shallow_file;
2021 if (args->deepen)
2022 opt.is_deepening_fetch = 1;
2023 if (check_connected(iterate_ref_map, &iterator, &opt)) {
2024 error(_("remote did not send all necessary objects"));
2025 free_refs(ref_cpy);
2026 ref_cpy = NULL;
2027 rollback_shallow_file(the_repository, &shallow_lock);
2028 goto cleanup;
2029 }
2030 args->connectivity_checked = 1;
2031 }
2032
2033 update_shallow(args, sought, nr_sought, &si);
2034 cleanup:
2035 clear_shallow_info(&si);
2036 oid_array_clear(&shallows_scratch);
2037 return ref_cpy;
2038 }
2039
2040 static int add_to_object_array(const struct object_id *oid, void *data)
2041 {
2042 struct object_array *a = data;
2043
2044 add_object_array(lookup_object(the_repository, oid), "", a);
2045 return 0;
2046 }
2047
2048 static void clear_common_flag(struct oidset *s)
2049 {
2050 struct oidset_iter iter;
2051 const struct object_id *oid;
2052 oidset_iter_init(s, &iter);
2053
2054 while ((oid = oidset_iter_next(&iter))) {
2055 struct object *obj = lookup_object(the_repository, oid);
2056 obj->flags &= ~COMMON;
2057 }
2058 }
2059
2060 void negotiate_using_fetch(const struct oid_array *negotiation_tips,
2061 const struct string_list *server_options,
2062 int stateless_rpc,
2063 int fd[],
2064 struct oidset *acked_commits)
2065 {
2066 struct fetch_negotiator negotiator;
2067 struct packet_reader reader;
2068 struct object_array nt_object_array = OBJECT_ARRAY_INIT;
2069 struct strbuf req_buf = STRBUF_INIT;
2070 int haves_to_send = INITIAL_FLUSH;
2071 int in_vain = 0;
2072 int seen_ack = 0;
2073 int last_iteration = 0;
2074 timestamp_t min_generation = GENERATION_NUMBER_INFINITY;
2075
2076 fetch_negotiator_init(the_repository, &negotiator);
2077 mark_tips(&negotiator, negotiation_tips);
2078
2079 packet_reader_init(&reader, fd[0], NULL, 0,
2080 PACKET_READ_CHOMP_NEWLINE |
2081 PACKET_READ_DIE_ON_ERR_PACKET);
2082
2083 oid_array_for_each((struct oid_array *) negotiation_tips,
2084 add_to_object_array,
2085 &nt_object_array);
2086
2087 while (!last_iteration) {
2088 int haves_added;
2089 struct object_id common_oid;
2090 int received_ready = 0;
2091
2092 strbuf_reset(&req_buf);
2093 write_fetch_command_and_capabilities(&req_buf, server_options);
2094
2095 packet_buf_write(&req_buf, "wait-for-done");
2096
2097 haves_added = add_haves(&negotiator, &req_buf, &haves_to_send);
2098 in_vain += haves_added;
2099 if (!haves_added || (seen_ack && in_vain >= MAX_IN_VAIN))
2100 last_iteration = 1;
2101
2102 /* Send request */
2103 packet_buf_flush(&req_buf);
2104 if (write_in_full(fd[1], req_buf.buf, req_buf.len) < 0)
2105 die_errno(_("unable to write request to remote"));
2106
2107 /* Process ACKs/NAKs */
2108 process_section_header(&reader, "acknowledgments", 0);
2109 while (process_ack(&negotiator, &reader, &common_oid,
2110 &received_ready)) {
2111 struct commit *commit = lookup_commit(the_repository,
2112 &common_oid);
2113 if (commit) {
2114 timestamp_t generation;
2115
2116 parse_commit_or_die(commit);
2117 commit->object.flags |= COMMON;
2118 generation = commit_graph_generation(commit);
2119 if (generation < min_generation)
2120 min_generation = generation;
2121 }
2122 in_vain = 0;
2123 seen_ack = 1;
2124 oidset_insert(acked_commits, &common_oid);
2125 }
2126 if (received_ready)
2127 die(_("unexpected 'ready' from remote"));
2128 else
2129 do_check_stateless_delimiter(stateless_rpc, &reader);
2130 if (can_all_from_reach_with_flag(&nt_object_array, COMMON,
2131 REACH_SCRATCH, 0,
2132 min_generation))
2133 last_iteration = 1;
2134 }
2135 clear_common_flag(acked_commits);
2136 strbuf_release(&req_buf);
2137 }
2138
2139 int report_unmatched_refs(struct ref **sought, int nr_sought)
2140 {
2141 int i, ret = 0;
2142
2143 for (i = 0; i < nr_sought; i++) {
2144 if (!sought[i])
2145 continue;
2146 switch (sought[i]->match_status) {
2147 case REF_MATCHED:
2148 continue;
2149 case REF_NOT_MATCHED:
2150 error(_("no such remote ref %s"), sought[i]->name);
2151 break;
2152 case REF_UNADVERTISED_NOT_ALLOWED:
2153 error(_("Server does not allow request for unadvertised object %s"),
2154 sought[i]->name);
2155 break;
2156 }
2157 ret = 1;
2158 }
2159 return ret;
2160 }