promisor-remote: skip move_to_tail when no-op
[git/git.git] / fetch-pack.c
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 #include "fsck.h"
25
26 static int transfer_unpack_limit = -1;
27 static int fetch_unpack_limit = -1;
28 static int unpack_limit = 100;
29 static int prefer_ofs_delta = 1;
30 static int no_done;
31 static int deepen_since_ok;
32 static int deepen_not_ok;
33 static int fetch_fsck_objects = -1;
34 static int transfer_fsck_objects = -1;
35 static int agent_supported;
36 static int server_supports_filtering;
37 static struct lock_file shallow_lock;
38 static const char *alternate_shallow_file;
39 static char *negotiation_algorithm;
40 static struct strbuf fsck_msg_types = STRBUF_INIT;
41
42 /* Remember to update object flag allocation in object.h */
43 #define COMPLETE (1U << 0)
44 #define ALTERNATE (1U << 1)
45
46 /*
47 * After sending this many "have"s if we do not get any new ACK , we
48 * give up traversing our history.
49 */
50 #define MAX_IN_VAIN 256
51
52 static int multi_ack, use_sideband;
53 /* Allow specifying sha1 if it is a ref tip. */
54 #define ALLOW_TIP_SHA1 01
55 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
56 #define ALLOW_REACHABLE_SHA1 02
57 static unsigned int allow_unadvertised_object_request;
58
59 __attribute__((format (printf, 2, 3)))
60 static inline void print_verbose(const struct fetch_pack_args *args,
61 const char *fmt, ...)
62 {
63 va_list params;
64
65 if (!args->verbose)
66 return;
67
68 va_start(params, fmt);
69 vfprintf(stderr, fmt, params);
70 va_end(params);
71 fputc('\n', stderr);
72 }
73
74 struct alternate_object_cache {
75 struct object **items;
76 size_t nr, alloc;
77 };
78
79 static void cache_one_alternate(const struct object_id *oid,
80 void *vcache)
81 {
82 struct alternate_object_cache *cache = vcache;
83 struct object *obj = parse_object(the_repository, oid);
84
85 if (!obj || (obj->flags & ALTERNATE))
86 return;
87
88 obj->flags |= ALTERNATE;
89 ALLOC_GROW(cache->items, cache->nr + 1, cache->alloc);
90 cache->items[cache->nr++] = obj;
91 }
92
93 static void for_each_cached_alternate(struct fetch_negotiator *negotiator,
94 void (*cb)(struct fetch_negotiator *,
95 struct object *))
96 {
97 static int initialized;
98 static struct alternate_object_cache cache;
99 size_t i;
100
101 if (!initialized) {
102 for_each_alternate_ref(cache_one_alternate, &cache);
103 initialized = 1;
104 }
105
106 for (i = 0; i < cache.nr; i++)
107 cb(negotiator, cache.items[i]);
108 }
109
110 static int rev_list_insert_ref(struct fetch_negotiator *negotiator,
111 const char *refname,
112 const struct object_id *oid)
113 {
114 struct object *o = deref_tag(the_repository,
115 parse_object(the_repository, oid),
116 refname, 0);
117
118 if (o && o->type == OBJ_COMMIT)
119 negotiator->add_tip(negotiator, (struct commit *)o);
120
121 return 0;
122 }
123
124 static int rev_list_insert_ref_oid(const char *refname, const struct object_id *oid,
125 int flag, void *cb_data)
126 {
127 return rev_list_insert_ref(cb_data, refname, oid);
128 }
129
130 enum ack_type {
131 NAK = 0,
132 ACK,
133 ACK_continue,
134 ACK_common,
135 ACK_ready
136 };
137
138 static void consume_shallow_list(struct fetch_pack_args *args,
139 struct packet_reader *reader)
140 {
141 if (args->stateless_rpc && args->deepen) {
142 /* If we sent a depth we will get back "duplicate"
143 * shallow and unshallow commands every time there
144 * is a block of have lines exchanged.
145 */
146 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
147 if (starts_with(reader->line, "shallow "))
148 continue;
149 if (starts_with(reader->line, "unshallow "))
150 continue;
151 die(_("git fetch-pack: expected shallow list"));
152 }
153 if (reader->status != PACKET_READ_FLUSH)
154 die(_("git fetch-pack: expected a flush packet after shallow list"));
155 }
156 }
157
158 static enum ack_type get_ack(struct packet_reader *reader,
159 struct object_id *result_oid)
160 {
161 int len;
162 const char *arg;
163
164 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
165 die(_("git fetch-pack: expected ACK/NAK, got a flush packet"));
166 len = reader->pktlen;
167
168 if (!strcmp(reader->line, "NAK"))
169 return NAK;
170 if (skip_prefix(reader->line, "ACK ", &arg)) {
171 if (!get_oid_hex(arg, result_oid)) {
172 arg += 40;
173 len -= arg - reader->line;
174 if (len < 1)
175 return ACK;
176 if (strstr(arg, "continue"))
177 return ACK_continue;
178 if (strstr(arg, "common"))
179 return ACK_common;
180 if (strstr(arg, "ready"))
181 return ACK_ready;
182 return ACK;
183 }
184 }
185 die(_("git fetch-pack: expected ACK/NAK, got '%s'"), reader->line);
186 }
187
188 static void send_request(struct fetch_pack_args *args,
189 int fd, struct strbuf *buf)
190 {
191 if (args->stateless_rpc) {
192 send_sideband(fd, -1, buf->buf, buf->len, LARGE_PACKET_MAX);
193 packet_flush(fd);
194 } else {
195 if (write_in_full(fd, buf->buf, buf->len) < 0)
196 die_errno(_("unable to write to remote"));
197 }
198 }
199
200 static void insert_one_alternate_object(struct fetch_negotiator *negotiator,
201 struct object *obj)
202 {
203 rev_list_insert_ref(negotiator, NULL, &obj->oid);
204 }
205
206 #define INITIAL_FLUSH 16
207 #define PIPESAFE_FLUSH 32
208 #define LARGE_FLUSH 16384
209
210 static int next_flush(int stateless_rpc, int count)
211 {
212 if (stateless_rpc) {
213 if (count < LARGE_FLUSH)
214 count <<= 1;
215 else
216 count = count * 11 / 10;
217 } else {
218 if (count < PIPESAFE_FLUSH)
219 count <<= 1;
220 else
221 count += PIPESAFE_FLUSH;
222 }
223 return count;
224 }
225
226 static void mark_tips(struct fetch_negotiator *negotiator,
227 const struct oid_array *negotiation_tips)
228 {
229 int i;
230
231 if (!negotiation_tips) {
232 for_each_ref(rev_list_insert_ref_oid, negotiator);
233 return;
234 }
235
236 for (i = 0; i < negotiation_tips->nr; i++)
237 rev_list_insert_ref(negotiator, NULL,
238 &negotiation_tips->oid[i]);
239 return;
240 }
241
242 static int find_common(struct fetch_negotiator *negotiator,
243 struct fetch_pack_args *args,
244 int fd[2], struct object_id *result_oid,
245 struct ref *refs)
246 {
247 int fetching;
248 int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval;
249 const struct object_id *oid;
250 unsigned in_vain = 0;
251 int got_continue = 0;
252 int got_ready = 0;
253 struct strbuf req_buf = STRBUF_INIT;
254 size_t state_len = 0;
255 struct packet_reader reader;
256
257 if (args->stateless_rpc && multi_ack == 1)
258 die(_("--stateless-rpc requires multi_ack_detailed"));
259
260 packet_reader_init(&reader, fd[0], NULL, 0,
261 PACKET_READ_CHOMP_NEWLINE |
262 PACKET_READ_DIE_ON_ERR_PACKET);
263
264 if (!args->no_dependents) {
265 mark_tips(negotiator, args->negotiation_tips);
266 for_each_cached_alternate(negotiator, insert_one_alternate_object);
267 }
268
269 fetching = 0;
270 for ( ; refs ; refs = refs->next) {
271 struct object_id *remote = &refs->old_oid;
272 const char *remote_hex;
273 struct object *o;
274
275 /*
276 * If that object is complete (i.e. it is an ancestor of a
277 * local ref), we tell them we have it but do not have to
278 * tell them about its ancestors, which they already know
279 * about.
280 *
281 * We use lookup_object here because we are only
282 * interested in the case we *know* the object is
283 * reachable and we have already scanned it.
284 *
285 * Do this only if args->no_dependents is false (if it is true,
286 * we cannot trust the object flags).
287 */
288 if (!args->no_dependents &&
289 ((o = lookup_object(the_repository, remote->hash)) != NULL) &&
290 (o->flags & COMPLETE)) {
291 continue;
292 }
293
294 remote_hex = oid_to_hex(remote);
295 if (!fetching) {
296 struct strbuf c = STRBUF_INIT;
297 if (multi_ack == 2) strbuf_addstr(&c, " multi_ack_detailed");
298 if (multi_ack == 1) strbuf_addstr(&c, " multi_ack");
299 if (no_done) strbuf_addstr(&c, " no-done");
300 if (use_sideband == 2) strbuf_addstr(&c, " side-band-64k");
301 if (use_sideband == 1) strbuf_addstr(&c, " side-band");
302 if (args->deepen_relative) strbuf_addstr(&c, " deepen-relative");
303 if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack");
304 if (args->no_progress) strbuf_addstr(&c, " no-progress");
305 if (args->include_tag) strbuf_addstr(&c, " include-tag");
306 if (prefer_ofs_delta) strbuf_addstr(&c, " ofs-delta");
307 if (deepen_since_ok) strbuf_addstr(&c, " deepen-since");
308 if (deepen_not_ok) strbuf_addstr(&c, " deepen-not");
309 if (agent_supported) strbuf_addf(&c, " agent=%s",
310 git_user_agent_sanitized());
311 if (args->filter_options.choice)
312 strbuf_addstr(&c, " filter");
313 packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
314 strbuf_release(&c);
315 } else
316 packet_buf_write(&req_buf, "want %s\n", remote_hex);
317 fetching++;
318 }
319
320 if (!fetching) {
321 strbuf_release(&req_buf);
322 packet_flush(fd[1]);
323 return 1;
324 }
325
326 if (is_repository_shallow(the_repository))
327 write_shallow_commits(&req_buf, 1, NULL);
328 if (args->depth > 0)
329 packet_buf_write(&req_buf, "deepen %d", args->depth);
330 if (args->deepen_since) {
331 timestamp_t max_age = approxidate(args->deepen_since);
332 packet_buf_write(&req_buf, "deepen-since %"PRItime, max_age);
333 }
334 if (args->deepen_not) {
335 int i;
336 for (i = 0; i < args->deepen_not->nr; i++) {
337 struct string_list_item *s = args->deepen_not->items + i;
338 packet_buf_write(&req_buf, "deepen-not %s", s->string);
339 }
340 }
341 if (server_supports_filtering && args->filter_options.choice) {
342 struct strbuf expanded_filter_spec = STRBUF_INIT;
343 expand_list_objects_filter_spec(&args->filter_options,
344 &expanded_filter_spec);
345 packet_buf_write(&req_buf, "filter %s",
346 expanded_filter_spec.buf);
347 strbuf_release(&expanded_filter_spec);
348 }
349 packet_buf_flush(&req_buf);
350 state_len = req_buf.len;
351
352 if (args->deepen) {
353 const char *arg;
354 struct object_id oid;
355
356 send_request(args, fd[1], &req_buf);
357 while (packet_reader_read(&reader) == PACKET_READ_NORMAL) {
358 if (skip_prefix(reader.line, "shallow ", &arg)) {
359 if (get_oid_hex(arg, &oid))
360 die(_("invalid shallow line: %s"), reader.line);
361 register_shallow(the_repository, &oid);
362 continue;
363 }
364 if (skip_prefix(reader.line, "unshallow ", &arg)) {
365 if (get_oid_hex(arg, &oid))
366 die(_("invalid unshallow line: %s"), reader.line);
367 if (!lookup_object(the_repository, oid.hash))
368 die(_("object not found: %s"), reader.line);
369 /* make sure that it is parsed as shallow */
370 if (!parse_object(the_repository, &oid))
371 die(_("error in object: %s"), reader.line);
372 if (unregister_shallow(&oid))
373 die(_("no shallow found: %s"), reader.line);
374 continue;
375 }
376 die(_("expected shallow/unshallow, got %s"), reader.line);
377 }
378 } else if (!args->stateless_rpc)
379 send_request(args, fd[1], &req_buf);
380
381 if (!args->stateless_rpc) {
382 /* If we aren't using the stateless-rpc interface
383 * we don't need to retain the headers.
384 */
385 strbuf_setlen(&req_buf, 0);
386 state_len = 0;
387 }
388
389 flushes = 0;
390 retval = -1;
391 if (args->no_dependents)
392 goto done;
393 while ((oid = negotiator->next(negotiator))) {
394 packet_buf_write(&req_buf, "have %s\n", oid_to_hex(oid));
395 print_verbose(args, "have %s", oid_to_hex(oid));
396 in_vain++;
397 if (flush_at <= ++count) {
398 int ack;
399
400 packet_buf_flush(&req_buf);
401 send_request(args, fd[1], &req_buf);
402 strbuf_setlen(&req_buf, state_len);
403 flushes++;
404 flush_at = next_flush(args->stateless_rpc, count);
405
406 /*
407 * We keep one window "ahead" of the other side, and
408 * will wait for an ACK only on the next one
409 */
410 if (!args->stateless_rpc && count == INITIAL_FLUSH)
411 continue;
412
413 consume_shallow_list(args, &reader);
414 do {
415 ack = get_ack(&reader, result_oid);
416 if (ack)
417 print_verbose(args, _("got %s %d %s"), "ack",
418 ack, oid_to_hex(result_oid));
419 switch (ack) {
420 case ACK:
421 flushes = 0;
422 multi_ack = 0;
423 retval = 0;
424 goto done;
425 case ACK_common:
426 case ACK_ready:
427 case ACK_continue: {
428 struct commit *commit =
429 lookup_commit(the_repository,
430 result_oid);
431 int was_common;
432
433 if (!commit)
434 die(_("invalid commit %s"), oid_to_hex(result_oid));
435 was_common = negotiator->ack(negotiator, commit);
436 if (args->stateless_rpc
437 && ack == ACK_common
438 && !was_common) {
439 /* We need to replay the have for this object
440 * on the next RPC request so the peer knows
441 * it is in common with us.
442 */
443 const char *hex = oid_to_hex(result_oid);
444 packet_buf_write(&req_buf, "have %s\n", hex);
445 state_len = req_buf.len;
446 /*
447 * Reset in_vain because an ack
448 * for this commit has not been
449 * seen.
450 */
451 in_vain = 0;
452 } else if (!args->stateless_rpc
453 || ack != ACK_common)
454 in_vain = 0;
455 retval = 0;
456 got_continue = 1;
457 if (ack == ACK_ready)
458 got_ready = 1;
459 break;
460 }
461 }
462 } while (ack);
463 flushes--;
464 if (got_continue && MAX_IN_VAIN < in_vain) {
465 print_verbose(args, _("giving up"));
466 break; /* give up */
467 }
468 if (got_ready)
469 break;
470 }
471 }
472 done:
473 if (!got_ready || !no_done) {
474 packet_buf_write(&req_buf, "done\n");
475 send_request(args, fd[1], &req_buf);
476 }
477 print_verbose(args, _("done"));
478 if (retval != 0) {
479 multi_ack = 0;
480 flushes++;
481 }
482 strbuf_release(&req_buf);
483
484 if (!got_ready || !no_done)
485 consume_shallow_list(args, &reader);
486 while (flushes || multi_ack) {
487 int ack = get_ack(&reader, result_oid);
488 if (ack) {
489 print_verbose(args, _("got %s (%d) %s"), "ack",
490 ack, oid_to_hex(result_oid));
491 if (ack == ACK)
492 return 0;
493 multi_ack = 1;
494 continue;
495 }
496 flushes--;
497 }
498 /* it is no error to fetch into a completely empty repo */
499 return count ? retval : 0;
500 }
501
502 static struct commit_list *complete;
503
504 static int mark_complete(const struct object_id *oid)
505 {
506 struct object *o = parse_object(the_repository, oid);
507
508 while (o && o->type == OBJ_TAG) {
509 struct tag *t = (struct tag *) o;
510 if (!t->tagged)
511 break; /* broken repository */
512 o->flags |= COMPLETE;
513 o = parse_object(the_repository, &t->tagged->oid);
514 }
515 if (o && o->type == OBJ_COMMIT) {
516 struct commit *commit = (struct commit *)o;
517 if (!(commit->object.flags & COMPLETE)) {
518 commit->object.flags |= COMPLETE;
519 commit_list_insert(commit, &complete);
520 }
521 }
522 return 0;
523 }
524
525 static int mark_complete_oid(const char *refname, const struct object_id *oid,
526 int flag, void *cb_data)
527 {
528 return mark_complete(oid);
529 }
530
531 static void mark_recent_complete_commits(struct fetch_pack_args *args,
532 timestamp_t cutoff)
533 {
534 while (complete && cutoff <= complete->item->date) {
535 print_verbose(args, _("Marking %s as complete"),
536 oid_to_hex(&complete->item->object.oid));
537 pop_most_recent_commit(&complete, COMPLETE);
538 }
539 }
540
541 static void add_refs_to_oidset(struct oidset *oids, struct ref *refs)
542 {
543 for (; refs; refs = refs->next)
544 oidset_insert(oids, &refs->old_oid);
545 }
546
547 static int is_unmatched_ref(const struct ref *ref)
548 {
549 struct object_id oid;
550 const char *p;
551 return ref->match_status == REF_NOT_MATCHED &&
552 !parse_oid_hex(ref->name, &oid, &p) &&
553 *p == '\0' &&
554 oideq(&oid, &ref->old_oid);
555 }
556
557 static void filter_refs(struct fetch_pack_args *args,
558 struct ref **refs,
559 struct ref **sought, int nr_sought)
560 {
561 struct ref *newlist = NULL;
562 struct ref **newtail = &newlist;
563 struct ref *unmatched = NULL;
564 struct ref *ref, *next;
565 struct oidset tip_oids = OIDSET_INIT;
566 int i;
567 int strict = !(allow_unadvertised_object_request &
568 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
569
570 i = 0;
571 for (ref = *refs; ref; ref = next) {
572 int keep = 0;
573 next = ref->next;
574
575 if (starts_with(ref->name, "refs/") &&
576 check_refname_format(ref->name, 0)) {
577 /*
578 * trash or a peeled value; do not even add it to
579 * unmatched list
580 */
581 free_one_ref(ref);
582 continue;
583 } else {
584 while (i < nr_sought) {
585 int cmp = strcmp(ref->name, sought[i]->name);
586 if (cmp < 0)
587 break; /* definitely do not have it */
588 else if (cmp == 0) {
589 keep = 1; /* definitely have it */
590 sought[i]->match_status = REF_MATCHED;
591 }
592 i++;
593 }
594
595 if (!keep && args->fetch_all &&
596 (!args->deepen || !starts_with(ref->name, "refs/tags/")))
597 keep = 1;
598 }
599
600 if (keep) {
601 *newtail = ref;
602 ref->next = NULL;
603 newtail = &ref->next;
604 } else {
605 ref->next = unmatched;
606 unmatched = ref;
607 }
608 }
609
610 if (strict) {
611 for (i = 0; i < nr_sought; i++) {
612 ref = sought[i];
613 if (!is_unmatched_ref(ref))
614 continue;
615
616 add_refs_to_oidset(&tip_oids, unmatched);
617 add_refs_to_oidset(&tip_oids, newlist);
618 break;
619 }
620 }
621
622 /* Append unmatched requests to the list */
623 for (i = 0; i < nr_sought; i++) {
624 ref = sought[i];
625 if (!is_unmatched_ref(ref))
626 continue;
627
628 if (!strict || oidset_contains(&tip_oids, &ref->old_oid)) {
629 ref->match_status = REF_MATCHED;
630 *newtail = copy_ref(ref);
631 newtail = &(*newtail)->next;
632 } else {
633 ref->match_status = REF_UNADVERTISED_NOT_ALLOWED;
634 }
635 }
636
637 oidset_clear(&tip_oids);
638 free_refs(unmatched);
639
640 *refs = newlist;
641 }
642
643 static void mark_alternate_complete(struct fetch_negotiator *unused,
644 struct object *obj)
645 {
646 mark_complete(&obj->oid);
647 }
648
649 struct loose_object_iter {
650 struct oidset *loose_object_set;
651 struct ref *refs;
652 };
653
654 /*
655 * Mark recent commits available locally and reachable from a local ref as
656 * COMPLETE. If args->no_dependents is false, also mark COMPLETE remote refs as
657 * COMMON_REF (otherwise, we are not planning to participate in negotiation, and
658 * thus do not need COMMON_REF marks).
659 *
660 * The cutoff time for recency is determined by this heuristic: it is the
661 * earliest commit time of the objects in refs that are commits and that we know
662 * the commit time of.
663 */
664 static void mark_complete_and_common_ref(struct fetch_negotiator *negotiator,
665 struct fetch_pack_args *args,
666 struct ref **refs)
667 {
668 struct ref *ref;
669 int old_save_commit_buffer = save_commit_buffer;
670 timestamp_t cutoff = 0;
671
672 save_commit_buffer = 0;
673
674 for (ref = *refs; ref; ref = ref->next) {
675 struct object *o;
676
677 if (!has_object_file_with_flags(&ref->old_oid,
678 OBJECT_INFO_QUICK))
679 continue;
680 o = parse_object(the_repository, &ref->old_oid);
681 if (!o)
682 continue;
683
684 /* We already have it -- which may mean that we were
685 * in sync with the other side at some time after
686 * that (it is OK if we guess wrong here).
687 */
688 if (o->type == OBJ_COMMIT) {
689 struct commit *commit = (struct commit *)o;
690 if (!cutoff || cutoff < commit->date)
691 cutoff = commit->date;
692 }
693 }
694
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 save_commit_buffer = old_save_commit_buffer;
721 }
722
723 /*
724 * Returns 1 if every object pointed to by the given remote refs is available
725 * locally and reachable from a local ref, and 0 otherwise.
726 */
727 static int everything_local(struct fetch_pack_args *args,
728 struct ref **refs)
729 {
730 struct ref *ref;
731 int retval;
732
733 for (retval = 1, ref = *refs; ref ; ref = ref->next) {
734 const struct object_id *remote = &ref->old_oid;
735 struct object *o;
736
737 o = lookup_object(the_repository, remote->hash);
738 if (!o || !(o->flags & COMPLETE)) {
739 retval = 0;
740 print_verbose(args, "want %s (%s)", oid_to_hex(remote),
741 ref->name);
742 continue;
743 }
744 print_verbose(args, _("already have %s (%s)"), oid_to_hex(remote),
745 ref->name);
746 }
747
748 return retval;
749 }
750
751 static int sideband_demux(int in, int out, void *data)
752 {
753 int *xd = data;
754 int ret;
755
756 ret = recv_sideband("fetch-pack", xd[0], out);
757 close(out);
758 return ret;
759 }
760
761 static int get_pack(struct fetch_pack_args *args,
762 int xd[2], char **pack_lockfile)
763 {
764 struct async demux;
765 int do_keep = args->keep_pack;
766 const char *cmd_name;
767 struct pack_header header;
768 int pass_header = 0;
769 struct child_process cmd = CHILD_PROCESS_INIT;
770 int ret;
771
772 memset(&demux, 0, sizeof(demux));
773 if (use_sideband) {
774 /* xd[] is talking with upload-pack; subprocess reads from
775 * xd[0], spits out band#2 to stderr, and feeds us band#1
776 * through demux->out.
777 */
778 demux.proc = sideband_demux;
779 demux.data = xd;
780 demux.out = -1;
781 demux.isolate_sigpipe = 1;
782 if (start_async(&demux))
783 die(_("fetch-pack: unable to fork off sideband demultiplexer"));
784 }
785 else
786 demux.out = xd[0];
787
788 if (!args->keep_pack && unpack_limit) {
789
790 if (read_pack_header(demux.out, &header))
791 die(_("protocol error: bad pack header"));
792 pass_header = 1;
793 if (ntohl(header.hdr_entries) < unpack_limit)
794 do_keep = 0;
795 else
796 do_keep = 1;
797 }
798
799 if (alternate_shallow_file) {
800 argv_array_push(&cmd.args, "--shallow-file");
801 argv_array_push(&cmd.args, alternate_shallow_file);
802 }
803
804 if (do_keep || args->from_promisor) {
805 if (pack_lockfile)
806 cmd.out = -1;
807 cmd_name = "index-pack";
808 argv_array_push(&cmd.args, cmd_name);
809 argv_array_push(&cmd.args, "--stdin");
810 if (!args->quiet && !args->no_progress)
811 argv_array_push(&cmd.args, "-v");
812 if (args->use_thin_pack)
813 argv_array_push(&cmd.args, "--fix-thin");
814 if (do_keep && (args->lock_pack || unpack_limit)) {
815 char hostname[HOST_NAME_MAX + 1];
816 if (xgethostname(hostname, sizeof(hostname)))
817 xsnprintf(hostname, sizeof(hostname), "localhost");
818 argv_array_pushf(&cmd.args,
819 "--keep=fetch-pack %"PRIuMAX " on %s",
820 (uintmax_t)getpid(), hostname);
821 }
822 if (args->check_self_contained_and_connected)
823 argv_array_push(&cmd.args, "--check-self-contained-and-connected");
824 if (args->from_promisor)
825 argv_array_push(&cmd.args, "--promisor");
826 }
827 else {
828 cmd_name = "unpack-objects";
829 argv_array_push(&cmd.args, cmd_name);
830 if (args->quiet || args->no_progress)
831 argv_array_push(&cmd.args, "-q");
832 args->check_self_contained_and_connected = 0;
833 }
834
835 if (pass_header)
836 argv_array_pushf(&cmd.args, "--pack_header=%"PRIu32",%"PRIu32,
837 ntohl(header.hdr_version),
838 ntohl(header.hdr_entries));
839 if (fetch_fsck_objects >= 0
840 ? fetch_fsck_objects
841 : transfer_fsck_objects >= 0
842 ? transfer_fsck_objects
843 : 0) {
844 if (args->from_promisor)
845 /*
846 * We cannot use --strict in index-pack because it
847 * checks both broken objects and links, but we only
848 * want to check for broken objects.
849 */
850 argv_array_push(&cmd.args, "--fsck-objects");
851 else
852 argv_array_pushf(&cmd.args, "--strict%s",
853 fsck_msg_types.buf);
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, negotiation_algorithm);
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 if (!args->no_dependents) {
974 mark_complete_and_common_ref(&negotiator, args, &ref);
975 filter_refs(args, &ref, sought, nr_sought);
976 if (everything_local(args, &ref)) {
977 packet_flush(fd[1]);
978 goto all_done;
979 }
980 } else {
981 filter_refs(args, &ref, sought, nr_sought);
982 }
983 if (find_common(&negotiator, args, fd, &oid, ref) < 0)
984 if (!args->keep_pack)
985 /* When cloning, it is not unusual to have
986 * no common commit.
987 */
988 warning(_("no common commits"));
989
990 if (args->stateless_rpc)
991 packet_flush(fd[1]);
992 if (args->deepen)
993 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
994 NULL);
995 else if (si->nr_ours || si->nr_theirs)
996 alternate_shallow_file = setup_temporary_shallow(si->shallow);
997 else
998 alternate_shallow_file = NULL;
999 if (get_pack(args, fd, pack_lockfile))
1000 die(_("git fetch-pack: fetch failed."));
1001
1002 all_done:
1003 negotiator.release(&negotiator);
1004 return ref;
1005 }
1006
1007 static void add_shallow_requests(struct strbuf *req_buf,
1008 const struct fetch_pack_args *args)
1009 {
1010 if (is_repository_shallow(the_repository))
1011 write_shallow_commits(req_buf, 1, NULL);
1012 if (args->depth > 0)
1013 packet_buf_write(req_buf, "deepen %d", args->depth);
1014 if (args->deepen_since) {
1015 timestamp_t max_age = approxidate(args->deepen_since);
1016 packet_buf_write(req_buf, "deepen-since %"PRItime, max_age);
1017 }
1018 if (args->deepen_not) {
1019 int i;
1020 for (i = 0; i < args->deepen_not->nr; i++) {
1021 struct string_list_item *s = args->deepen_not->items + i;
1022 packet_buf_write(req_buf, "deepen-not %s", s->string);
1023 }
1024 }
1025 if (args->deepen_relative)
1026 packet_buf_write(req_buf, "deepen-relative\n");
1027 }
1028
1029 static void add_wants(int no_dependents, const struct ref *wants, struct strbuf *req_buf)
1030 {
1031 int use_ref_in_want = server_supports_feature("fetch", "ref-in-want", 0);
1032
1033 for ( ; wants ; wants = wants->next) {
1034 const struct object_id *remote = &wants->old_oid;
1035 struct object *o;
1036
1037 /*
1038 * If that object is complete (i.e. it is an ancestor of a
1039 * local ref), we tell them we have it but do not have to
1040 * tell them about its ancestors, which they already know
1041 * about.
1042 *
1043 * We use lookup_object here because we are only
1044 * interested in the case we *know* the object is
1045 * reachable and we have already scanned it.
1046 *
1047 * Do this only if args->no_dependents is false (if it is true,
1048 * we cannot trust the object flags).
1049 */
1050 if (!no_dependents &&
1051 ((o = lookup_object(the_repository, remote->hash)) != NULL) &&
1052 (o->flags & COMPLETE)) {
1053 continue;
1054 }
1055
1056 if (!use_ref_in_want || wants->exact_oid)
1057 packet_buf_write(req_buf, "want %s\n", oid_to_hex(remote));
1058 else
1059 packet_buf_write(req_buf, "want-ref %s\n", wants->name);
1060 }
1061 }
1062
1063 static void add_common(struct strbuf *req_buf, struct oidset *common)
1064 {
1065 struct oidset_iter iter;
1066 const struct object_id *oid;
1067 oidset_iter_init(common, &iter);
1068
1069 while ((oid = oidset_iter_next(&iter))) {
1070 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1071 }
1072 }
1073
1074 static int add_haves(struct fetch_negotiator *negotiator,
1075 struct strbuf *req_buf,
1076 int *haves_to_send, int *in_vain)
1077 {
1078 int ret = 0;
1079 int haves_added = 0;
1080 const struct object_id *oid;
1081
1082 while ((oid = negotiator->next(negotiator))) {
1083 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1084 if (++haves_added >= *haves_to_send)
1085 break;
1086 }
1087
1088 *in_vain += haves_added;
1089 if (!haves_added || *in_vain >= MAX_IN_VAIN) {
1090 /* Send Done */
1091 packet_buf_write(req_buf, "done\n");
1092 ret = 1;
1093 }
1094
1095 /* Increase haves to send on next round */
1096 *haves_to_send = next_flush(1, *haves_to_send);
1097
1098 return ret;
1099 }
1100
1101 static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out,
1102 const struct fetch_pack_args *args,
1103 const struct ref *wants, struct oidset *common,
1104 int *haves_to_send, int *in_vain,
1105 int sideband_all)
1106 {
1107 int ret = 0;
1108 struct strbuf req_buf = STRBUF_INIT;
1109
1110 if (server_supports_v2("fetch", 1))
1111 packet_buf_write(&req_buf, "command=fetch");
1112 if (server_supports_v2("agent", 0))
1113 packet_buf_write(&req_buf, "agent=%s", git_user_agent_sanitized());
1114 if (args->server_options && args->server_options->nr &&
1115 server_supports_v2("server-option", 1)) {
1116 int i;
1117 for (i = 0; i < args->server_options->nr; i++)
1118 packet_buf_write(&req_buf, "server-option=%s",
1119 args->server_options->items[i].string);
1120 }
1121
1122 packet_buf_delim(&req_buf);
1123 if (args->use_thin_pack)
1124 packet_buf_write(&req_buf, "thin-pack");
1125 if (args->no_progress)
1126 packet_buf_write(&req_buf, "no-progress");
1127 if (args->include_tag)
1128 packet_buf_write(&req_buf, "include-tag");
1129 if (prefer_ofs_delta)
1130 packet_buf_write(&req_buf, "ofs-delta");
1131 if (sideband_all)
1132 packet_buf_write(&req_buf, "sideband-all");
1133
1134 /* Add shallow-info and deepen request */
1135 if (server_supports_feature("fetch", "shallow", 0))
1136 add_shallow_requests(&req_buf, args);
1137 else if (is_repository_shallow(the_repository) || args->deepen)
1138 die(_("Server does not support shallow requests"));
1139
1140 /* Add filter */
1141 if (server_supports_feature("fetch", "filter", 0) &&
1142 args->filter_options.choice) {
1143 struct strbuf expanded_filter_spec = STRBUF_INIT;
1144 print_verbose(args, _("Server supports filter"));
1145 expand_list_objects_filter_spec(&args->filter_options,
1146 &expanded_filter_spec);
1147 packet_buf_write(&req_buf, "filter %s",
1148 expanded_filter_spec.buf);
1149 strbuf_release(&expanded_filter_spec);
1150 } else if (args->filter_options.choice) {
1151 warning("filtering not recognized by server, ignoring");
1152 }
1153
1154 /* add wants */
1155 add_wants(args->no_dependents, wants, &req_buf);
1156
1157 if (args->no_dependents) {
1158 packet_buf_write(&req_buf, "done");
1159 ret = 1;
1160 } else {
1161 /* Add all of the common commits we've found in previous rounds */
1162 add_common(&req_buf, common);
1163
1164 /* Add initial haves */
1165 ret = add_haves(negotiator, &req_buf, haves_to_send, in_vain);
1166 }
1167
1168 /* Send request */
1169 packet_buf_flush(&req_buf);
1170 if (write_in_full(fd_out, req_buf.buf, req_buf.len) < 0)
1171 die_errno(_("unable to write request to remote"));
1172
1173 strbuf_release(&req_buf);
1174 return ret;
1175 }
1176
1177 /*
1178 * Processes a section header in a server's response and checks if it matches
1179 * `section`. If the value of `peek` is 1, the header line will be peeked (and
1180 * not consumed); if 0, the line will be consumed and the function will die if
1181 * the section header doesn't match what was expected.
1182 */
1183 static int process_section_header(struct packet_reader *reader,
1184 const char *section, int peek)
1185 {
1186 int ret;
1187
1188 if (packet_reader_peek(reader) != PACKET_READ_NORMAL)
1189 die(_("error reading section header '%s'"), section);
1190
1191 ret = !strcmp(reader->line, section);
1192
1193 if (!peek) {
1194 if (!ret)
1195 die(_("expected '%s', received '%s'"),
1196 section, reader->line);
1197 packet_reader_read(reader);
1198 }
1199
1200 return ret;
1201 }
1202
1203 static int process_acks(struct fetch_negotiator *negotiator,
1204 struct packet_reader *reader,
1205 struct oidset *common)
1206 {
1207 /* received */
1208 int received_ready = 0;
1209 int received_ack = 0;
1210
1211 process_section_header(reader, "acknowledgments", 0);
1212 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1213 const char *arg;
1214
1215 if (!strcmp(reader->line, "NAK"))
1216 continue;
1217
1218 if (skip_prefix(reader->line, "ACK ", &arg)) {
1219 struct object_id oid;
1220 if (!get_oid_hex(arg, &oid)) {
1221 struct commit *commit;
1222 oidset_insert(common, &oid);
1223 commit = lookup_commit(the_repository, &oid);
1224 negotiator->ack(negotiator, commit);
1225 }
1226 continue;
1227 }
1228
1229 if (!strcmp(reader->line, "ready")) {
1230 received_ready = 1;
1231 continue;
1232 }
1233
1234 die(_("unexpected acknowledgment line: '%s'"), reader->line);
1235 }
1236
1237 if (reader->status != PACKET_READ_FLUSH &&
1238 reader->status != PACKET_READ_DELIM)
1239 die(_("error processing acks: %d"), reader->status);
1240
1241 /*
1242 * If an "acknowledgments" section is sent, a packfile is sent if and
1243 * only if "ready" was sent in this section. The other sections
1244 * ("shallow-info" and "wanted-refs") are sent only if a packfile is
1245 * sent. Therefore, a DELIM is expected if "ready" is sent, and a FLUSH
1246 * otherwise.
1247 */
1248 if (received_ready && reader->status != PACKET_READ_DELIM)
1249 die(_("expected packfile to be sent after 'ready'"));
1250 if (!received_ready && reader->status != PACKET_READ_FLUSH)
1251 die(_("expected no other sections to be sent after no 'ready'"));
1252
1253 /* return 0 if no common, 1 if there are common, or 2 if ready */
1254 return received_ready ? 2 : (received_ack ? 1 : 0);
1255 }
1256
1257 static void receive_shallow_info(struct fetch_pack_args *args,
1258 struct packet_reader *reader,
1259 struct oid_array *shallows,
1260 struct shallow_info *si)
1261 {
1262 int unshallow_received = 0;
1263
1264 process_section_header(reader, "shallow-info", 0);
1265 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1266 const char *arg;
1267 struct object_id oid;
1268
1269 if (skip_prefix(reader->line, "shallow ", &arg)) {
1270 if (get_oid_hex(arg, &oid))
1271 die(_("invalid shallow line: %s"), reader->line);
1272 oid_array_append(shallows, &oid);
1273 continue;
1274 }
1275 if (skip_prefix(reader->line, "unshallow ", &arg)) {
1276 if (get_oid_hex(arg, &oid))
1277 die(_("invalid unshallow line: %s"), reader->line);
1278 if (!lookup_object(the_repository, oid.hash))
1279 die(_("object not found: %s"), reader->line);
1280 /* make sure that it is parsed as shallow */
1281 if (!parse_object(the_repository, &oid))
1282 die(_("error in object: %s"), reader->line);
1283 if (unregister_shallow(&oid))
1284 die(_("no shallow found: %s"), reader->line);
1285 unshallow_received = 1;
1286 continue;
1287 }
1288 die(_("expected shallow/unshallow, got %s"), reader->line);
1289 }
1290
1291 if (reader->status != PACKET_READ_FLUSH &&
1292 reader->status != PACKET_READ_DELIM)
1293 die(_("error processing shallow info: %d"), reader->status);
1294
1295 if (args->deepen || unshallow_received) {
1296 /*
1297 * Treat these as shallow lines caused by our depth settings.
1298 * In v0, these lines cannot cause refs to be rejected; do the
1299 * same.
1300 */
1301 int i;
1302
1303 for (i = 0; i < shallows->nr; i++)
1304 register_shallow(the_repository, &shallows->oid[i]);
1305 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
1306 NULL);
1307 args->deepen = 1;
1308 } else if (shallows->nr) {
1309 /*
1310 * Treat these as shallow lines caused by the remote being
1311 * shallow. In v0, remote refs that reach these objects are
1312 * rejected (unless --update-shallow is set); do the same.
1313 */
1314 prepare_shallow_info(si, shallows);
1315 if (si->nr_ours || si->nr_theirs)
1316 alternate_shallow_file =
1317 setup_temporary_shallow(si->shallow);
1318 else
1319 alternate_shallow_file = NULL;
1320 } else {
1321 alternate_shallow_file = NULL;
1322 }
1323 }
1324
1325 static int cmp_name_ref(const void *name, const void *ref)
1326 {
1327 return strcmp(name, (*(struct ref **)ref)->name);
1328 }
1329
1330 static void receive_wanted_refs(struct packet_reader *reader,
1331 struct ref **sought, int nr_sought)
1332 {
1333 process_section_header(reader, "wanted-refs", 0);
1334 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1335 struct object_id oid;
1336 const char *end;
1337 struct ref **found;
1338
1339 if (parse_oid_hex(reader->line, &oid, &end) || *end++ != ' ')
1340 die(_("expected wanted-ref, got '%s'"), reader->line);
1341
1342 found = bsearch(end, sought, nr_sought, sizeof(*sought),
1343 cmp_name_ref);
1344 if (!found)
1345 die(_("unexpected wanted-ref: '%s'"), reader->line);
1346 oidcpy(&(*found)->old_oid, &oid);
1347 }
1348
1349 if (reader->status != PACKET_READ_DELIM)
1350 die(_("error processing wanted refs: %d"), reader->status);
1351 }
1352
1353 enum fetch_state {
1354 FETCH_CHECK_LOCAL = 0,
1355 FETCH_SEND_REQUEST,
1356 FETCH_PROCESS_ACKS,
1357 FETCH_GET_PACK,
1358 FETCH_DONE,
1359 };
1360
1361 static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
1362 int fd[2],
1363 const struct ref *orig_ref,
1364 struct ref **sought, int nr_sought,
1365 struct oid_array *shallows,
1366 struct shallow_info *si,
1367 char **pack_lockfile)
1368 {
1369 struct ref *ref = copy_ref_list(orig_ref);
1370 enum fetch_state state = FETCH_CHECK_LOCAL;
1371 struct oidset common = OIDSET_INIT;
1372 struct packet_reader reader;
1373 int in_vain = 0;
1374 int haves_to_send = INITIAL_FLUSH;
1375 struct fetch_negotiator negotiator;
1376 fetch_negotiator_init(&negotiator, negotiation_algorithm);
1377 packet_reader_init(&reader, fd[0], NULL, 0,
1378 PACKET_READ_CHOMP_NEWLINE |
1379 PACKET_READ_DIE_ON_ERR_PACKET);
1380 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 1) &&
1381 server_supports_feature("fetch", "sideband-all", 0)) {
1382 reader.use_sideband = 1;
1383 reader.me = "fetch-pack";
1384 }
1385
1386 while (state != FETCH_DONE) {
1387 switch (state) {
1388 case FETCH_CHECK_LOCAL:
1389 sort_ref_list(&ref, ref_compare_name);
1390 QSORT(sought, nr_sought, cmp_ref_by_name);
1391
1392 /* v2 supports these by default */
1393 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1394 use_sideband = 2;
1395 if (args->depth > 0 || args->deepen_since || args->deepen_not)
1396 args->deepen = 1;
1397
1398 /* Filter 'ref' by 'sought' and those that aren't local */
1399 if (!args->no_dependents) {
1400 mark_complete_and_common_ref(&negotiator, args, &ref);
1401 filter_refs(args, &ref, sought, nr_sought);
1402 if (everything_local(args, &ref))
1403 state = FETCH_DONE;
1404 else
1405 state = FETCH_SEND_REQUEST;
1406
1407 mark_tips(&negotiator, args->negotiation_tips);
1408 for_each_cached_alternate(&negotiator,
1409 insert_one_alternate_object);
1410 } else {
1411 filter_refs(args, &ref, sought, nr_sought);
1412 state = FETCH_SEND_REQUEST;
1413 }
1414 break;
1415 case FETCH_SEND_REQUEST:
1416 if (send_fetch_request(&negotiator, fd[1], args, ref,
1417 &common,
1418 &haves_to_send, &in_vain,
1419 reader.use_sideband))
1420 state = FETCH_GET_PACK;
1421 else
1422 state = FETCH_PROCESS_ACKS;
1423 break;
1424 case FETCH_PROCESS_ACKS:
1425 /* Process ACKs/NAKs */
1426 switch (process_acks(&negotiator, &reader, &common)) {
1427 case 2:
1428 state = FETCH_GET_PACK;
1429 break;
1430 case 1:
1431 in_vain = 0;
1432 /* fallthrough */
1433 default:
1434 state = FETCH_SEND_REQUEST;
1435 break;
1436 }
1437 break;
1438 case FETCH_GET_PACK:
1439 /* Check for shallow-info section */
1440 if (process_section_header(&reader, "shallow-info", 1))
1441 receive_shallow_info(args, &reader, shallows, si);
1442
1443 if (process_section_header(&reader, "wanted-refs", 1))
1444 receive_wanted_refs(&reader, sought, nr_sought);
1445
1446 /* get the pack */
1447 process_section_header(&reader, "packfile", 0);
1448 if (get_pack(args, fd, pack_lockfile))
1449 die(_("git fetch-pack: fetch failed."));
1450
1451 state = FETCH_DONE;
1452 break;
1453 case FETCH_DONE:
1454 continue;
1455 }
1456 }
1457
1458 negotiator.release(&negotiator);
1459 oidset_clear(&common);
1460 return ref;
1461 }
1462
1463 static int fetch_pack_config_cb(const char *var, const char *value, void *cb)
1464 {
1465 if (strcmp(var, "fetch.fsck.skiplist") == 0) {
1466 const char *path;
1467
1468 if (git_config_pathname(&path, var, value))
1469 return 1;
1470 strbuf_addf(&fsck_msg_types, "%cskiplist=%s",
1471 fsck_msg_types.len ? ',' : '=', path);
1472 free((char *)path);
1473 return 0;
1474 }
1475
1476 if (skip_prefix(var, "fetch.fsck.", &var)) {
1477 if (is_valid_msg_type(var, value))
1478 strbuf_addf(&fsck_msg_types, "%c%s=%s",
1479 fsck_msg_types.len ? ',' : '=', var, value);
1480 else
1481 warning("Skipping unknown msg id '%s'", var);
1482 return 0;
1483 }
1484
1485 return git_default_config(var, value, cb);
1486 }
1487
1488 static void fetch_pack_config(void)
1489 {
1490 git_config_get_int("fetch.unpacklimit", &fetch_unpack_limit);
1491 git_config_get_int("transfer.unpacklimit", &transfer_unpack_limit);
1492 git_config_get_bool("repack.usedeltabaseoffset", &prefer_ofs_delta);
1493 git_config_get_bool("fetch.fsckobjects", &fetch_fsck_objects);
1494 git_config_get_bool("transfer.fsckobjects", &transfer_fsck_objects);
1495 git_config_get_string("fetch.negotiationalgorithm",
1496 &negotiation_algorithm);
1497
1498 git_config(fetch_pack_config_cb, NULL);
1499 }
1500
1501 static void fetch_pack_setup(void)
1502 {
1503 static int did_setup;
1504 if (did_setup)
1505 return;
1506 fetch_pack_config();
1507 if (0 <= transfer_unpack_limit)
1508 unpack_limit = transfer_unpack_limit;
1509 else if (0 <= fetch_unpack_limit)
1510 unpack_limit = fetch_unpack_limit;
1511 did_setup = 1;
1512 }
1513
1514 static int remove_duplicates_in_refs(struct ref **ref, int nr)
1515 {
1516 struct string_list names = STRING_LIST_INIT_NODUP;
1517 int src, dst;
1518
1519 for (src = dst = 0; src < nr; src++) {
1520 struct string_list_item *item;
1521 item = string_list_insert(&names, ref[src]->name);
1522 if (item->util)
1523 continue; /* already have it */
1524 item->util = ref[src];
1525 if (src != dst)
1526 ref[dst] = ref[src];
1527 dst++;
1528 }
1529 for (src = dst; src < nr; src++)
1530 ref[src] = NULL;
1531 string_list_clear(&names, 0);
1532 return dst;
1533 }
1534
1535 static void update_shallow(struct fetch_pack_args *args,
1536 struct ref **sought, int nr_sought,
1537 struct shallow_info *si)
1538 {
1539 struct oid_array ref = OID_ARRAY_INIT;
1540 int *status;
1541 int i;
1542
1543 if (args->deepen && alternate_shallow_file) {
1544 if (*alternate_shallow_file == '\0') { /* --unshallow */
1545 unlink_or_warn(git_path_shallow(the_repository));
1546 rollback_lock_file(&shallow_lock);
1547 } else
1548 commit_lock_file(&shallow_lock);
1549 alternate_shallow_file = NULL;
1550 return;
1551 }
1552
1553 if (!si->shallow || !si->shallow->nr)
1554 return;
1555
1556 if (args->cloning) {
1557 /*
1558 * remote is shallow, but this is a clone, there are
1559 * no objects in repo to worry about. Accept any
1560 * shallow points that exist in the pack (iow in repo
1561 * after get_pack() and reprepare_packed_git())
1562 */
1563 struct oid_array extra = OID_ARRAY_INIT;
1564 struct object_id *oid = si->shallow->oid;
1565 for (i = 0; i < si->shallow->nr; i++)
1566 if (has_object_file(&oid[i]))
1567 oid_array_append(&extra, &oid[i]);
1568 if (extra.nr) {
1569 setup_alternate_shallow(&shallow_lock,
1570 &alternate_shallow_file,
1571 &extra);
1572 commit_lock_file(&shallow_lock);
1573 alternate_shallow_file = NULL;
1574 }
1575 oid_array_clear(&extra);
1576 return;
1577 }
1578
1579 if (!si->nr_ours && !si->nr_theirs)
1580 return;
1581
1582 remove_nonexistent_theirs_shallow(si);
1583 if (!si->nr_ours && !si->nr_theirs)
1584 return;
1585 for (i = 0; i < nr_sought; i++)
1586 oid_array_append(&ref, &sought[i]->old_oid);
1587 si->ref = &ref;
1588
1589 if (args->update_shallow) {
1590 /*
1591 * remote is also shallow, .git/shallow may be updated
1592 * so all refs can be accepted. Make sure we only add
1593 * shallow roots that are actually reachable from new
1594 * refs.
1595 */
1596 struct oid_array extra = OID_ARRAY_INIT;
1597 struct object_id *oid = si->shallow->oid;
1598 assign_shallow_commits_to_refs(si, NULL, NULL);
1599 if (!si->nr_ours && !si->nr_theirs) {
1600 oid_array_clear(&ref);
1601 return;
1602 }
1603 for (i = 0; i < si->nr_ours; i++)
1604 oid_array_append(&extra, &oid[si->ours[i]]);
1605 for (i = 0; i < si->nr_theirs; i++)
1606 oid_array_append(&extra, &oid[si->theirs[i]]);
1607 setup_alternate_shallow(&shallow_lock,
1608 &alternate_shallow_file,
1609 &extra);
1610 commit_lock_file(&shallow_lock);
1611 oid_array_clear(&extra);
1612 oid_array_clear(&ref);
1613 alternate_shallow_file = NULL;
1614 return;
1615 }
1616
1617 /*
1618 * remote is also shallow, check what ref is safe to update
1619 * without updating .git/shallow
1620 */
1621 status = xcalloc(nr_sought, sizeof(*status));
1622 assign_shallow_commits_to_refs(si, NULL, status);
1623 if (si->nr_ours || si->nr_theirs) {
1624 for (i = 0; i < nr_sought; i++)
1625 if (status[i])
1626 sought[i]->status = REF_STATUS_REJECT_SHALLOW;
1627 }
1628 free(status);
1629 oid_array_clear(&ref);
1630 }
1631
1632 static int iterate_ref_map(void *cb_data, struct object_id *oid)
1633 {
1634 struct ref **rm = cb_data;
1635 struct ref *ref = *rm;
1636
1637 if (!ref)
1638 return -1; /* end of the list */
1639 *rm = ref->next;
1640 oidcpy(oid, &ref->old_oid);
1641 return 0;
1642 }
1643
1644 struct ref *fetch_pack(struct fetch_pack_args *args,
1645 int fd[],
1646 const struct ref *ref,
1647 struct ref **sought, int nr_sought,
1648 struct oid_array *shallow,
1649 char **pack_lockfile,
1650 enum protocol_version version)
1651 {
1652 struct ref *ref_cpy;
1653 struct shallow_info si;
1654 struct oid_array shallows_scratch = OID_ARRAY_INIT;
1655
1656 fetch_pack_setup();
1657 if (nr_sought)
1658 nr_sought = remove_duplicates_in_refs(sought, nr_sought);
1659
1660 if (args->no_dependents && !args->filter_options.choice) {
1661 /*
1662 * The protocol does not support requesting that only the
1663 * wanted objects be sent, so approximate this by setting a
1664 * "blob:none" filter if no filter is already set. This works
1665 * for all object types: note that wanted blobs will still be
1666 * sent because they are directly specified as a "want".
1667 *
1668 * NEEDSWORK: Add an option in the protocol to request that
1669 * only the wanted objects be sent, and implement it.
1670 */
1671 parse_list_objects_filter(&args->filter_options, "blob:none");
1672 }
1673
1674 if (version != protocol_v2 && !ref) {
1675 packet_flush(fd[1]);
1676 die(_("no matching remote head"));
1677 }
1678 if (version == protocol_v2) {
1679 if (shallow->nr)
1680 BUG("Protocol V2 does not provide shallows at this point in the fetch");
1681 memset(&si, 0, sizeof(si));
1682 ref_cpy = do_fetch_pack_v2(args, fd, ref, sought, nr_sought,
1683 &shallows_scratch, &si,
1684 pack_lockfile);
1685 } else {
1686 prepare_shallow_info(&si, shallow);
1687 ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought,
1688 &si, pack_lockfile);
1689 }
1690 reprepare_packed_git(the_repository);
1691
1692 if (!args->cloning && args->deepen) {
1693 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1694 struct ref *iterator = ref_cpy;
1695 opt.shallow_file = alternate_shallow_file;
1696 if (args->deepen)
1697 opt.is_deepening_fetch = 1;
1698 if (check_connected(iterate_ref_map, &iterator, &opt)) {
1699 error(_("remote did not send all necessary objects"));
1700 free_refs(ref_cpy);
1701 ref_cpy = NULL;
1702 rollback_lock_file(&shallow_lock);
1703 goto cleanup;
1704 }
1705 args->connectivity_checked = 1;
1706 }
1707
1708 update_shallow(args, sought, nr_sought, &si);
1709 cleanup:
1710 clear_shallow_info(&si);
1711 oid_array_clear(&shallows_scratch);
1712 return ref_cpy;
1713 }
1714
1715 int report_unmatched_refs(struct ref **sought, int nr_sought)
1716 {
1717 int i, ret = 0;
1718
1719 for (i = 0; i < nr_sought; i++) {
1720 if (!sought[i])
1721 continue;
1722 switch (sought[i]->match_status) {
1723 case REF_MATCHED:
1724 continue;
1725 case REF_NOT_MATCHED:
1726 error(_("no such remote ref %s"), sought[i]->name);
1727 break;
1728 case REF_UNADVERTISED_NOT_ALLOWED:
1729 error(_("Server does not allow request for unadvertised object %s"),
1730 sought[i]->name);
1731 break;
1732 }
1733 ret = 1;
1734 }
1735 return ret;
1736 }