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treewide: rename 'EXCL_FLAG_' to 'PATTERN_FLAG_'
[git.git] / fetch-pack.c
blob72e13b0a1da516ec86fc80e0ed6e17215064e1ce
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 const char *spec =
343 expand_list_objects_filter_spec(&args->filter_options);
344 packet_buf_write(&req_buf, "filter %s", spec);
345 }
346 packet_buf_flush(&req_buf);
347 state_len = req_buf.len;
348
349 if (args->deepen) {
350 const char *arg;
351 struct object_id oid;
352
353 send_request(args, fd[1], &req_buf);
354 while (packet_reader_read(&reader) == PACKET_READ_NORMAL) {
355 if (skip_prefix(reader.line, "shallow ", &arg)) {
356 if (get_oid_hex(arg, &oid))
357 die(_("invalid shallow line: %s"), reader.line);
358 register_shallow(the_repository, &oid);
359 continue;
360 }
361 if (skip_prefix(reader.line, "unshallow ", &arg)) {
362 if (get_oid_hex(arg, &oid))
363 die(_("invalid unshallow line: %s"), reader.line);
364 if (!lookup_object(the_repository, oid.hash))
365 die(_("object not found: %s"), reader.line);
366 /* make sure that it is parsed as shallow */
367 if (!parse_object(the_repository, &oid))
368 die(_("error in object: %s"), reader.line);
369 if (unregister_shallow(&oid))
370 die(_("no shallow found: %s"), reader.line);
371 continue;
372 }
373 die(_("expected shallow/unshallow, got %s"), reader.line);
374 }
375 } else if (!args->stateless_rpc)
376 send_request(args, fd[1], &req_buf);
377
378 if (!args->stateless_rpc) {
379 /* If we aren't using the stateless-rpc interface
380 * we don't need to retain the headers.
381 */
382 strbuf_setlen(&req_buf, 0);
383 state_len = 0;
384 }
385
386 flushes = 0;
387 retval = -1;
388 if (args->no_dependents)
389 goto done;
390 while ((oid = negotiator->next(negotiator))) {
391 packet_buf_write(&req_buf, "have %s\n", oid_to_hex(oid));
392 print_verbose(args, "have %s", oid_to_hex(oid));
393 in_vain++;
394 if (flush_at <= ++count) {
395 int ack;
396
397 packet_buf_flush(&req_buf);
398 send_request(args, fd[1], &req_buf);
399 strbuf_setlen(&req_buf, state_len);
400 flushes++;
401 flush_at = next_flush(args->stateless_rpc, count);
402
403 /*
404 * We keep one window "ahead" of the other side, and
405 * will wait for an ACK only on the next one
406 */
407 if (!args->stateless_rpc && count == INITIAL_FLUSH)
408 continue;
409
410 consume_shallow_list(args, &reader);
411 do {
412 ack = get_ack(&reader, result_oid);
413 if (ack)
414 print_verbose(args, _("got %s %d %s"), "ack",
415 ack, oid_to_hex(result_oid));
416 switch (ack) {
417 case ACK:
418 flushes = 0;
419 multi_ack = 0;
420 retval = 0;
421 goto done;
422 case ACK_common:
423 case ACK_ready:
424 case ACK_continue: {
425 struct commit *commit =
426 lookup_commit(the_repository,
427 result_oid);
428 int was_common;
429
430 if (!commit)
431 die(_("invalid commit %s"), oid_to_hex(result_oid));
432 was_common = negotiator->ack(negotiator, commit);
433 if (args->stateless_rpc
434 && ack == ACK_common
435 && !was_common) {
436 /* We need to replay the have for this object
437 * on the next RPC request so the peer knows
438 * it is in common with us.
439 */
440 const char *hex = oid_to_hex(result_oid);
441 packet_buf_write(&req_buf, "have %s\n", hex);
442 state_len = req_buf.len;
443 /*
444 * Reset in_vain because an ack
445 * for this commit has not been
446 * seen.
447 */
448 in_vain = 0;
449 } else if (!args->stateless_rpc
450 || ack != ACK_common)
451 in_vain = 0;
452 retval = 0;
453 got_continue = 1;
454 if (ack == ACK_ready)
455 got_ready = 1;
456 break;
457 }
458 }
459 } while (ack);
460 flushes--;
461 if (got_continue && MAX_IN_VAIN < in_vain) {
462 print_verbose(args, _("giving up"));
463 break; /* give up */
464 }
465 if (got_ready)
466 break;
467 }
468 }
469 done:
470 if (!got_ready || !no_done) {
471 packet_buf_write(&req_buf, "done\n");
472 send_request(args, fd[1], &req_buf);
473 }
474 print_verbose(args, _("done"));
475 if (retval != 0) {
476 multi_ack = 0;
477 flushes++;
478 }
479 strbuf_release(&req_buf);
480
481 if (!got_ready || !no_done)
482 consume_shallow_list(args, &reader);
483 while (flushes || multi_ack) {
484 int ack = get_ack(&reader, result_oid);
485 if (ack) {
486 print_verbose(args, _("got %s (%d) %s"), "ack",
487 ack, oid_to_hex(result_oid));
488 if (ack == ACK)
489 return 0;
490 multi_ack = 1;
491 continue;
492 }
493 flushes--;
494 }
495 /* it is no error to fetch into a completely empty repo */
496 return count ? retval : 0;
497 }
498
499 static struct commit_list *complete;
500
501 static int mark_complete(const struct object_id *oid)
502 {
503 struct object *o = parse_object(the_repository, oid);
504
505 while (o && o->type == OBJ_TAG) {
506 struct tag *t = (struct tag *) o;
507 if (!t->tagged)
508 break; /* broken repository */
509 o->flags |= COMPLETE;
510 o = parse_object(the_repository, &t->tagged->oid);
511 }
512 if (o && o->type == OBJ_COMMIT) {
513 struct commit *commit = (struct commit *)o;
514 if (!(commit->object.flags & COMPLETE)) {
515 commit->object.flags |= COMPLETE;
516 commit_list_insert(commit, &complete);
517 }
518 }
519 return 0;
520 }
521
522 static int mark_complete_oid(const char *refname, const struct object_id *oid,
523 int flag, void *cb_data)
524 {
525 return mark_complete(oid);
526 }
527
528 static void mark_recent_complete_commits(struct fetch_pack_args *args,
529 timestamp_t cutoff)
530 {
531 while (complete && cutoff <= complete->item->date) {
532 print_verbose(args, _("Marking %s as complete"),
533 oid_to_hex(&complete->item->object.oid));
534 pop_most_recent_commit(&complete, COMPLETE);
535 }
536 }
537
538 static void add_refs_to_oidset(struct oidset *oids, struct ref *refs)
539 {
540 for (; refs; refs = refs->next)
541 oidset_insert(oids, &refs->old_oid);
542 }
543
544 static int is_unmatched_ref(const struct ref *ref)
545 {
546 struct object_id oid;
547 const char *p;
548 return ref->match_status == REF_NOT_MATCHED &&
549 !parse_oid_hex(ref->name, &oid, &p) &&
550 *p == '\0' &&
551 oideq(&oid, &ref->old_oid);
552 }
553
554 static void filter_refs(struct fetch_pack_args *args,
555 struct ref **refs,
556 struct ref **sought, int nr_sought)
557 {
558 struct ref *newlist = NULL;
559 struct ref **newtail = &newlist;
560 struct ref *unmatched = NULL;
561 struct ref *ref, *next;
562 struct oidset tip_oids = OIDSET_INIT;
563 int i;
564 int strict = !(allow_unadvertised_object_request &
565 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
566
567 i = 0;
568 for (ref = *refs; ref; ref = next) {
569 int keep = 0;
570 next = ref->next;
571
572 if (starts_with(ref->name, "refs/") &&
573 check_refname_format(ref->name, 0)) {
574 /*
575 * trash or a peeled value; do not even add it to
576 * unmatched list
577 */
578 free_one_ref(ref);
579 continue;
580 } else {
581 while (i < nr_sought) {
582 int cmp = strcmp(ref->name, sought[i]->name);
583 if (cmp < 0)
584 break; /* definitely do not have it */
585 else if (cmp == 0) {
586 keep = 1; /* definitely have it */
587 sought[i]->match_status = REF_MATCHED;
588 }
589 i++;
590 }
591
592 if (!keep && args->fetch_all &&
593 (!args->deepen || !starts_with(ref->name, "refs/tags/")))
594 keep = 1;
595 }
596
597 if (keep) {
598 *newtail = ref;
599 ref->next = NULL;
600 newtail = &ref->next;
601 } else {
602 ref->next = unmatched;
603 unmatched = ref;
604 }
605 }
606
607 if (strict) {
608 for (i = 0; i < nr_sought; i++) {
609 ref = sought[i];
610 if (!is_unmatched_ref(ref))
611 continue;
612
613 add_refs_to_oidset(&tip_oids, unmatched);
614 add_refs_to_oidset(&tip_oids, newlist);
615 break;
616 }
617 }
618
619 /* Append unmatched requests to the list */
620 for (i = 0; i < nr_sought; i++) {
621 ref = sought[i];
622 if (!is_unmatched_ref(ref))
623 continue;
624
625 if (!strict || oidset_contains(&tip_oids, &ref->old_oid)) {
626 ref->match_status = REF_MATCHED;
627 *newtail = copy_ref(ref);
628 newtail = &(*newtail)->next;
629 } else {
630 ref->match_status = REF_UNADVERTISED_NOT_ALLOWED;
631 }
632 }
633
634 oidset_clear(&tip_oids);
635 free_refs(unmatched);
636
637 *refs = newlist;
638 }
639
640 static void mark_alternate_complete(struct fetch_negotiator *unused,
641 struct object *obj)
642 {
643 mark_complete(&obj->oid);
644 }
645
646 struct loose_object_iter {
647 struct oidset *loose_object_set;
648 struct ref *refs;
649 };
650
651 /*
652 * Mark recent commits available locally and reachable from a local ref as
653 * COMPLETE. If args->no_dependents is false, also mark COMPLETE remote refs as
654 * COMMON_REF (otherwise, we are not planning to participate in negotiation, and
655 * thus do not need COMMON_REF marks).
656 *
657 * The cutoff time for recency is determined by this heuristic: it is the
658 * earliest commit time of the objects in refs that are commits and that we know
659 * the commit time of.
660 */
661 static void mark_complete_and_common_ref(struct fetch_negotiator *negotiator,
662 struct fetch_pack_args *args,
663 struct ref **refs)
664 {
665 struct ref *ref;
666 int old_save_commit_buffer = save_commit_buffer;
667 timestamp_t cutoff = 0;
668
669 save_commit_buffer = 0;
670
671 for (ref = *refs; ref; ref = ref->next) {
672 struct object *o;
673
674 if (!has_object_file_with_flags(&ref->old_oid,
675 OBJECT_INFO_QUICK))
676 continue;
677 o = parse_object(the_repository, &ref->old_oid);
678 if (!o)
679 continue;
680
681 /* We already have it -- which may mean that we were
682 * in sync with the other side at some time after
683 * that (it is OK if we guess wrong here).
684 */
685 if (o->type == OBJ_COMMIT) {
686 struct commit *commit = (struct commit *)o;
687 if (!cutoff || cutoff < commit->date)
688 cutoff = commit->date;
689 }
690 }
691
692 if (!args->deepen) {
693 for_each_ref(mark_complete_oid, NULL);
694 for_each_cached_alternate(NULL, mark_alternate_complete);
695 commit_list_sort_by_date(&complete);
696 if (cutoff)
697 mark_recent_complete_commits(args, cutoff);
698 }
699
700 /*
701 * Mark all complete remote refs as common refs.
702 * Don't mark them common yet; the server has to be told so first.
703 */
704 for (ref = *refs; ref; ref = ref->next) {
705 struct object *o = deref_tag(the_repository,
706 lookup_object(the_repository,
707 ref->old_oid.hash),
708 NULL, 0);
709
710 if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE))
711 continue;
712
713 negotiator->known_common(negotiator,
714 (struct commit *)o);
715 }
716
717 save_commit_buffer = old_save_commit_buffer;
718 }
719
720 /*
721 * Returns 1 if every object pointed to by the given remote refs is available
722 * locally and reachable from a local ref, and 0 otherwise.
723 */
724 static int everything_local(struct fetch_pack_args *args,
725 struct ref **refs)
726 {
727 struct ref *ref;
728 int retval;
729
730 for (retval = 1, ref = *refs; ref ; ref = ref->next) {
731 const struct object_id *remote = &ref->old_oid;
732 struct object *o;
733
734 o = lookup_object(the_repository, remote->hash);
735 if (!o || !(o->flags & COMPLETE)) {
736 retval = 0;
737 print_verbose(args, "want %s (%s)", oid_to_hex(remote),
738 ref->name);
739 continue;
740 }
741 print_verbose(args, _("already have %s (%s)"), oid_to_hex(remote),
742 ref->name);
743 }
744
745 return retval;
746 }
747
748 static int sideband_demux(int in, int out, void *data)
749 {
750 int *xd = data;
751 int ret;
752
753 ret = recv_sideband("fetch-pack", xd[0], out);
754 close(out);
755 return ret;
756 }
757
758 static int get_pack(struct fetch_pack_args *args,
759 int xd[2], char **pack_lockfile)
760 {
761 struct async demux;
762 int do_keep = args->keep_pack;
763 const char *cmd_name;
764 struct pack_header header;
765 int pass_header = 0;
766 struct child_process cmd = CHILD_PROCESS_INIT;
767 int ret;
768
769 memset(&demux, 0, sizeof(demux));
770 if (use_sideband) {
771 /* xd[] is talking with upload-pack; subprocess reads from
772 * xd[0], spits out band#2 to stderr, and feeds us band#1
773 * through demux->out.
774 */
775 demux.proc = sideband_demux;
776 demux.data = xd;
777 demux.out = -1;
778 demux.isolate_sigpipe = 1;
779 if (start_async(&demux))
780 die(_("fetch-pack: unable to fork off sideband demultiplexer"));
781 }
782 else
783 demux.out = xd[0];
784
785 if (!args->keep_pack && unpack_limit) {
786
787 if (read_pack_header(demux.out, &header))
788 die(_("protocol error: bad pack header"));
789 pass_header = 1;
790 if (ntohl(header.hdr_entries) < unpack_limit)
791 do_keep = 0;
792 else
793 do_keep = 1;
794 }
795
796 if (alternate_shallow_file) {
797 argv_array_push(&cmd.args, "--shallow-file");
798 argv_array_push(&cmd.args, alternate_shallow_file);
799 }
800
801 if (do_keep || args->from_promisor) {
802 if (pack_lockfile)
803 cmd.out = -1;
804 cmd_name = "index-pack";
805 argv_array_push(&cmd.args, cmd_name);
806 argv_array_push(&cmd.args, "--stdin");
807 if (!args->quiet && !args->no_progress)
808 argv_array_push(&cmd.args, "-v");
809 if (args->use_thin_pack)
810 argv_array_push(&cmd.args, "--fix-thin");
811 if (do_keep && (args->lock_pack || unpack_limit)) {
812 char hostname[HOST_NAME_MAX + 1];
813 if (xgethostname(hostname, sizeof(hostname)))
814 xsnprintf(hostname, sizeof(hostname), "localhost");
815 argv_array_pushf(&cmd.args,
816 "--keep=fetch-pack %"PRIuMAX " on %s",
817 (uintmax_t)getpid(), hostname);
818 }
819 if (args->check_self_contained_and_connected)
820 argv_array_push(&cmd.args, "--check-self-contained-and-connected");
821 if (args->from_promisor)
822 argv_array_push(&cmd.args, "--promisor");
823 }
824 else {
825 cmd_name = "unpack-objects";
826 argv_array_push(&cmd.args, cmd_name);
827 if (args->quiet || args->no_progress)
828 argv_array_push(&cmd.args, "-q");
829 args->check_self_contained_and_connected = 0;
830 }
831
832 if (pass_header)
833 argv_array_pushf(&cmd.args, "--pack_header=%"PRIu32",%"PRIu32,
834 ntohl(header.hdr_version),
835 ntohl(header.hdr_entries));
836 if (fetch_fsck_objects >= 0
837 ? fetch_fsck_objects
838 : transfer_fsck_objects >= 0
839 ? transfer_fsck_objects
840 : 0) {
841 if (args->from_promisor)
842 /*
843 * We cannot use --strict in index-pack because it
844 * checks both broken objects and links, but we only
845 * want to check for broken objects.
846 */
847 argv_array_push(&cmd.args, "--fsck-objects");
848 else
849 argv_array_pushf(&cmd.args, "--strict%s",
850 fsck_msg_types.buf);
851 }
852
853 cmd.in = demux.out;
854 cmd.git_cmd = 1;
855 if (start_command(&cmd))
856 die(_("fetch-pack: unable to fork off %s"), cmd_name);
857 if (do_keep && pack_lockfile) {
858 *pack_lockfile = index_pack_lockfile(cmd.out);
859 close(cmd.out);
860 }
861
862 if (!use_sideband)
863 /* Closed by start_command() */
864 xd[0] = -1;
865
866 ret = finish_command(&cmd);
867 if (!ret || (args->check_self_contained_and_connected && ret == 1))
868 args->self_contained_and_connected =
869 args->check_self_contained_and_connected &&
870 ret == 0;
871 else
872 die(_("%s failed"), cmd_name);
873 if (use_sideband && finish_async(&demux))
874 die(_("error in sideband demultiplexer"));
875 return 0;
876 }
877
878 static int cmp_ref_by_name(const void *a_, const void *b_)
879 {
880 const struct ref *a = *((const struct ref **)a_);
881 const struct ref *b = *((const struct ref **)b_);
882 return strcmp(a->name, b->name);
883 }
884
885 static struct ref *do_fetch_pack(struct fetch_pack_args *args,
886 int fd[2],
887 const struct ref *orig_ref,
888 struct ref **sought, int nr_sought,
889 struct shallow_info *si,
890 char **pack_lockfile)
891 {
892 struct ref *ref = copy_ref_list(orig_ref);
893 struct object_id oid;
894 const char *agent_feature;
895 int agent_len;
896 struct fetch_negotiator negotiator;
897 fetch_negotiator_init(&negotiator, negotiation_algorithm);
898
899 sort_ref_list(&ref, ref_compare_name);
900 QSORT(sought, nr_sought, cmp_ref_by_name);
901
902 if ((args->depth > 0 || is_repository_shallow(the_repository)) && !server_supports("shallow"))
903 die(_("Server does not support shallow clients"));
904 if (args->depth > 0 || args->deepen_since || args->deepen_not)
905 args->deepen = 1;
906 if (server_supports("multi_ack_detailed")) {
907 print_verbose(args, _("Server supports multi_ack_detailed"));
908 multi_ack = 2;
909 if (server_supports("no-done")) {
910 print_verbose(args, _("Server supports no-done"));
911 if (args->stateless_rpc)
912 no_done = 1;
913 }
914 }
915 else if (server_supports("multi_ack")) {
916 print_verbose(args, _("Server supports multi_ack"));
917 multi_ack = 1;
918 }
919 if (server_supports("side-band-64k")) {
920 print_verbose(args, _("Server supports side-band-64k"));
921 use_sideband = 2;
922 }
923 else if (server_supports("side-band")) {
924 print_verbose(args, _("Server supports side-band"));
925 use_sideband = 1;
926 }
927 if (server_supports("allow-tip-sha1-in-want")) {
928 print_verbose(args, _("Server supports allow-tip-sha1-in-want"));
929 allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
930 }
931 if (server_supports("allow-reachable-sha1-in-want")) {
932 print_verbose(args, _("Server supports allow-reachable-sha1-in-want"));
933 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
934 }
935 if (!server_supports("thin-pack"))
936 args->use_thin_pack = 0;
937 if (!server_supports("no-progress"))
938 args->no_progress = 0;
939 if (!server_supports("include-tag"))
940 args->include_tag = 0;
941 if (server_supports("ofs-delta"))
942 print_verbose(args, _("Server supports ofs-delta"));
943 else
944 prefer_ofs_delta = 0;
945
946 if (server_supports("filter")) {
947 server_supports_filtering = 1;
948 print_verbose(args, _("Server supports filter"));
949 } else if (args->filter_options.choice) {
950 warning("filtering not recognized by server, ignoring");
951 }
952
953 if ((agent_feature = server_feature_value("agent", &agent_len))) {
954 agent_supported = 1;
955 if (agent_len)
956 print_verbose(args, _("Server version is %.*s"),
957 agent_len, agent_feature);
958 }
959 if (server_supports("deepen-since"))
960 deepen_since_ok = 1;
961 else if (args->deepen_since)
962 die(_("Server does not support --shallow-since"));
963 if (server_supports("deepen-not"))
964 deepen_not_ok = 1;
965 else if (args->deepen_not)
966 die(_("Server does not support --shallow-exclude"));
967 if (!server_supports("deepen-relative") && args->deepen_relative)
968 die(_("Server does not support --deepen"));
969
970 if (!args->no_dependents) {
971 mark_complete_and_common_ref(&negotiator, args, &ref);
972 filter_refs(args, &ref, sought, nr_sought);
973 if (everything_local(args, &ref)) {
974 packet_flush(fd[1]);
975 goto all_done;
976 }
977 } else {
978 filter_refs(args, &ref, sought, nr_sought);
979 }
980 if (find_common(&negotiator, args, fd, &oid, ref) < 0)
981 if (!args->keep_pack)
982 /* When cloning, it is not unusual to have
983 * no common commit.
984 */
985 warning(_("no common commits"));
986
987 if (args->stateless_rpc)
988 packet_flush(fd[1]);
989 if (args->deepen)
990 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
991 NULL);
992 else if (si->nr_ours || si->nr_theirs)
993 alternate_shallow_file = setup_temporary_shallow(si->shallow);
994 else
995 alternate_shallow_file = NULL;
996 if (get_pack(args, fd, pack_lockfile))
997 die(_("git fetch-pack: fetch failed."));
998
999 all_done:
1000 negotiator.release(&negotiator);
1001 return ref;
1002 }
1003
1004 static void add_shallow_requests(struct strbuf *req_buf,
1005 const struct fetch_pack_args *args)
1006 {
1007 if (is_repository_shallow(the_repository))
1008 write_shallow_commits(req_buf, 1, NULL);
1009 if (args->depth > 0)
1010 packet_buf_write(req_buf, "deepen %d", args->depth);
1011 if (args->deepen_since) {
1012 timestamp_t max_age = approxidate(args->deepen_since);
1013 packet_buf_write(req_buf, "deepen-since %"PRItime, max_age);
1014 }
1015 if (args->deepen_not) {
1016 int i;
1017 for (i = 0; i < args->deepen_not->nr; i++) {
1018 struct string_list_item *s = args->deepen_not->items + i;
1019 packet_buf_write(req_buf, "deepen-not %s", s->string);
1020 }
1021 }
1022 if (args->deepen_relative)
1023 packet_buf_write(req_buf, "deepen-relative\n");
1024 }
1025
1026 static void add_wants(int no_dependents, const struct ref *wants, struct strbuf *req_buf)
1027 {
1028 int use_ref_in_want = server_supports_feature("fetch", "ref-in-want", 0);
1029
1030 for ( ; wants ; wants = wants->next) {
1031 const struct object_id *remote = &wants->old_oid;
1032 struct object *o;
1033
1034 /*
1035 * If that object is complete (i.e. it is an ancestor of a
1036 * local ref), we tell them we have it but do not have to
1037 * tell them about its ancestors, which they already know
1038 * about.
1039 *
1040 * We use lookup_object here because we are only
1041 * interested in the case we *know* the object is
1042 * reachable and we have already scanned it.
1043 *
1044 * Do this only if args->no_dependents is false (if it is true,
1045 * we cannot trust the object flags).
1046 */
1047 if (!no_dependents &&
1048 ((o = lookup_object(the_repository, remote->hash)) != NULL) &&
1049 (o->flags & COMPLETE)) {
1050 continue;
1051 }
1052
1053 if (!use_ref_in_want || wants->exact_oid)
1054 packet_buf_write(req_buf, "want %s\n", oid_to_hex(remote));
1055 else
1056 packet_buf_write(req_buf, "want-ref %s\n", wants->name);
1057 }
1058 }
1059
1060 static void add_common(struct strbuf *req_buf, struct oidset *common)
1061 {
1062 struct oidset_iter iter;
1063 const struct object_id *oid;
1064 oidset_iter_init(common, &iter);
1065
1066 while ((oid = oidset_iter_next(&iter))) {
1067 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1068 }
1069 }
1070
1071 static int add_haves(struct fetch_negotiator *negotiator,
1072 struct strbuf *req_buf,
1073 int *haves_to_send, int *in_vain)
1074 {
1075 int ret = 0;
1076 int haves_added = 0;
1077 const struct object_id *oid;
1078
1079 while ((oid = negotiator->next(negotiator))) {
1080 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1081 if (++haves_added >= *haves_to_send)
1082 break;
1083 }
1084
1085 *in_vain += haves_added;
1086 if (!haves_added || *in_vain >= MAX_IN_VAIN) {
1087 /* Send Done */
1088 packet_buf_write(req_buf, "done\n");
1089 ret = 1;
1090 }
1091
1092 /* Increase haves to send on next round */
1093 *haves_to_send = next_flush(1, *haves_to_send);
1094
1095 return ret;
1096 }
1097
1098 static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out,
1099 struct fetch_pack_args *args,
1100 const struct ref *wants, struct oidset *common,
1101 int *haves_to_send, int *in_vain,
1102 int sideband_all)
1103 {
1104 int ret = 0;
1105 struct strbuf req_buf = STRBUF_INIT;
1106
1107 if (server_supports_v2("fetch", 1))
1108 packet_buf_write(&req_buf, "command=fetch");
1109 if (server_supports_v2("agent", 0))
1110 packet_buf_write(&req_buf, "agent=%s", git_user_agent_sanitized());
1111 if (args->server_options && args->server_options->nr &&
1112 server_supports_v2("server-option", 1)) {
1113 int i;
1114 for (i = 0; i < args->server_options->nr; i++)
1115 packet_buf_write(&req_buf, "server-option=%s",
1116 args->server_options->items[i].string);
1117 }
1118
1119 packet_buf_delim(&req_buf);
1120 if (args->use_thin_pack)
1121 packet_buf_write(&req_buf, "thin-pack");
1122 if (args->no_progress)
1123 packet_buf_write(&req_buf, "no-progress");
1124 if (args->include_tag)
1125 packet_buf_write(&req_buf, "include-tag");
1126 if (prefer_ofs_delta)
1127 packet_buf_write(&req_buf, "ofs-delta");
1128 if (sideband_all)
1129 packet_buf_write(&req_buf, "sideband-all");
1130
1131 /* Add shallow-info and deepen request */
1132 if (server_supports_feature("fetch", "shallow", 0))
1133 add_shallow_requests(&req_buf, args);
1134 else if (is_repository_shallow(the_repository) || args->deepen)
1135 die(_("Server does not support shallow requests"));
1136
1137 /* Add filter */
1138 if (server_supports_feature("fetch", "filter", 0) &&
1139 args->filter_options.choice) {
1140 const char *spec =
1141 expand_list_objects_filter_spec(&args->filter_options);
1142 print_verbose(args, _("Server supports filter"));
1143 packet_buf_write(&req_buf, "filter %s", spec);
1144 } else if (args->filter_options.choice) {
1145 warning("filtering not recognized by server, ignoring");
1146 }
1147
1148 /* add wants */
1149 add_wants(args->no_dependents, wants, &req_buf);
1150
1151 if (args->no_dependents) {
1152 packet_buf_write(&req_buf, "done");
1153 ret = 1;
1154 } else {
1155 /* Add all of the common commits we've found in previous rounds */
1156 add_common(&req_buf, common);
1157
1158 /* Add initial haves */
1159 ret = add_haves(negotiator, &req_buf, haves_to_send, in_vain);
1160 }
1161
1162 /* Send request */
1163 packet_buf_flush(&req_buf);
1164 if (write_in_full(fd_out, req_buf.buf, req_buf.len) < 0)
1165 die_errno(_("unable to write request to remote"));
1166
1167 strbuf_release(&req_buf);
1168 return ret;
1169 }
1170
1171 /*
1172 * Processes a section header in a server's response and checks if it matches
1173 * `section`. If the value of `peek` is 1, the header line will be peeked (and
1174 * not consumed); if 0, the line will be consumed and the function will die if
1175 * the section header doesn't match what was expected.
1176 */
1177 static int process_section_header(struct packet_reader *reader,
1178 const char *section, int peek)
1179 {
1180 int ret;
1181
1182 if (packet_reader_peek(reader) != PACKET_READ_NORMAL)
1183 die(_("error reading section header '%s'"), section);
1184
1185 ret = !strcmp(reader->line, section);
1186
1187 if (!peek) {
1188 if (!ret)
1189 die(_("expected '%s', received '%s'"),
1190 section, reader->line);
1191 packet_reader_read(reader);
1192 }
1193
1194 return ret;
1195 }
1196
1197 static int process_acks(struct fetch_negotiator *negotiator,
1198 struct packet_reader *reader,
1199 struct oidset *common)
1200 {
1201 /* received */
1202 int received_ready = 0;
1203 int received_ack = 0;
1204
1205 process_section_header(reader, "acknowledgments", 0);
1206 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1207 const char *arg;
1208
1209 if (!strcmp(reader->line, "NAK"))
1210 continue;
1211
1212 if (skip_prefix(reader->line, "ACK ", &arg)) {
1213 struct object_id oid;
1214 if (!get_oid_hex(arg, &oid)) {
1215 struct commit *commit;
1216 oidset_insert(common, &oid);
1217 commit = lookup_commit(the_repository, &oid);
1218 negotiator->ack(negotiator, commit);
1219 }
1220 continue;
1221 }
1222
1223 if (!strcmp(reader->line, "ready")) {
1224 received_ready = 1;
1225 continue;
1226 }
1227
1228 die(_("unexpected acknowledgment line: '%s'"), reader->line);
1229 }
1230
1231 if (reader->status != PACKET_READ_FLUSH &&
1232 reader->status != PACKET_READ_DELIM)
1233 die(_("error processing acks: %d"), reader->status);
1234
1235 /*
1236 * If an "acknowledgments" section is sent, a packfile is sent if and
1237 * only if "ready" was sent in this section. The other sections
1238 * ("shallow-info" and "wanted-refs") are sent only if a packfile is
1239 * sent. Therefore, a DELIM is expected if "ready" is sent, and a FLUSH
1240 * otherwise.
1241 */
1242 if (received_ready && reader->status != PACKET_READ_DELIM)
1243 die(_("expected packfile to be sent after 'ready'"));
1244 if (!received_ready && reader->status != PACKET_READ_FLUSH)
1245 die(_("expected no other sections to be sent after no 'ready'"));
1246
1247 /* return 0 if no common, 1 if there are common, or 2 if ready */
1248 return received_ready ? 2 : (received_ack ? 1 : 0);
1249 }
1250
1251 static void receive_shallow_info(struct fetch_pack_args *args,
1252 struct packet_reader *reader,
1253 struct oid_array *shallows,
1254 struct shallow_info *si)
1255 {
1256 int unshallow_received = 0;
1257
1258 process_section_header(reader, "shallow-info", 0);
1259 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1260 const char *arg;
1261 struct object_id oid;
1262
1263 if (skip_prefix(reader->line, "shallow ", &arg)) {
1264 if (get_oid_hex(arg, &oid))
1265 die(_("invalid shallow line: %s"), reader->line);
1266 oid_array_append(shallows, &oid);
1267 continue;
1268 }
1269 if (skip_prefix(reader->line, "unshallow ", &arg)) {
1270 if (get_oid_hex(arg, &oid))
1271 die(_("invalid unshallow line: %s"), reader->line);
1272 if (!lookup_object(the_repository, oid.hash))
1273 die(_("object not found: %s"), reader->line);
1274 /* make sure that it is parsed as shallow */
1275 if (!parse_object(the_repository, &oid))
1276 die(_("error in object: %s"), reader->line);
1277 if (unregister_shallow(&oid))
1278 die(_("no shallow found: %s"), reader->line);
1279 unshallow_received = 1;
1280 continue;
1281 }
1282 die(_("expected shallow/unshallow, got %s"), reader->line);
1283 }
1284
1285 if (reader->status != PACKET_READ_FLUSH &&
1286 reader->status != PACKET_READ_DELIM)
1287 die(_("error processing shallow info: %d"), reader->status);
1288
1289 if (args->deepen || unshallow_received) {
1290 /*
1291 * Treat these as shallow lines caused by our depth settings.
1292 * In v0, these lines cannot cause refs to be rejected; do the
1293 * same.
1294 */
1295 int i;
1296
1297 for (i = 0; i < shallows->nr; i++)
1298 register_shallow(the_repository, &shallows->oid[i]);
1299 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
1300 NULL);
1301 args->deepen = 1;
1302 } else if (shallows->nr) {
1303 /*
1304 * Treat these as shallow lines caused by the remote being
1305 * shallow. In v0, remote refs that reach these objects are
1306 * rejected (unless --update-shallow is set); do the same.
1307 */
1308 prepare_shallow_info(si, shallows);
1309 if (si->nr_ours || si->nr_theirs)
1310 alternate_shallow_file =
1311 setup_temporary_shallow(si->shallow);
1312 else
1313 alternate_shallow_file = NULL;
1314 } else {
1315 alternate_shallow_file = NULL;
1316 }
1317 }
1318
1319 static int cmp_name_ref(const void *name, const void *ref)
1320 {
1321 return strcmp(name, (*(struct ref **)ref)->name);
1322 }
1323
1324 static void receive_wanted_refs(struct packet_reader *reader,
1325 struct ref **sought, int nr_sought)
1326 {
1327 process_section_header(reader, "wanted-refs", 0);
1328 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1329 struct object_id oid;
1330 const char *end;
1331 struct ref **found;
1332
1333 if (parse_oid_hex(reader->line, &oid, &end) || *end++ != ' ')
1334 die(_("expected wanted-ref, got '%s'"), reader->line);
1335
1336 found = bsearch(end, sought, nr_sought, sizeof(*sought),
1337 cmp_name_ref);
1338 if (!found)
1339 die(_("unexpected wanted-ref: '%s'"), reader->line);
1340 oidcpy(&(*found)->old_oid, &oid);
1341 }
1342
1343 if (reader->status != PACKET_READ_DELIM)
1344 die(_("error processing wanted refs: %d"), reader->status);
1345 }
1346
1347 enum fetch_state {
1348 FETCH_CHECK_LOCAL = 0,
1349 FETCH_SEND_REQUEST,
1350 FETCH_PROCESS_ACKS,
1351 FETCH_GET_PACK,
1352 FETCH_DONE,
1353 };
1354
1355 static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
1356 int fd[2],
1357 const struct ref *orig_ref,
1358 struct ref **sought, int nr_sought,
1359 struct oid_array *shallows,
1360 struct shallow_info *si,
1361 char **pack_lockfile)
1362 {
1363 struct ref *ref = copy_ref_list(orig_ref);
1364 enum fetch_state state = FETCH_CHECK_LOCAL;
1365 struct oidset common = OIDSET_INIT;
1366 struct packet_reader reader;
1367 int in_vain = 0;
1368 int haves_to_send = INITIAL_FLUSH;
1369 struct fetch_negotiator negotiator;
1370 fetch_negotiator_init(&negotiator, negotiation_algorithm);
1371 packet_reader_init(&reader, fd[0], NULL, 0,
1372 PACKET_READ_CHOMP_NEWLINE |
1373 PACKET_READ_DIE_ON_ERR_PACKET);
1374 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 1) &&
1375 server_supports_feature("fetch", "sideband-all", 0)) {
1376 reader.use_sideband = 1;
1377 reader.me = "fetch-pack";
1378 }
1379
1380 while (state != FETCH_DONE) {
1381 switch (state) {
1382 case FETCH_CHECK_LOCAL:
1383 sort_ref_list(&ref, ref_compare_name);
1384 QSORT(sought, nr_sought, cmp_ref_by_name);
1385
1386 /* v2 supports these by default */
1387 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1388 use_sideband = 2;
1389 if (args->depth > 0 || args->deepen_since || args->deepen_not)
1390 args->deepen = 1;
1391
1392 /* Filter 'ref' by 'sought' and those that aren't local */
1393 if (!args->no_dependents) {
1394 mark_complete_and_common_ref(&negotiator, args, &ref);
1395 filter_refs(args, &ref, sought, nr_sought);
1396 if (everything_local(args, &ref))
1397 state = FETCH_DONE;
1398 else
1399 state = FETCH_SEND_REQUEST;
1400
1401 mark_tips(&negotiator, args->negotiation_tips);
1402 for_each_cached_alternate(&negotiator,
1403 insert_one_alternate_object);
1404 } else {
1405 filter_refs(args, &ref, sought, nr_sought);
1406 state = FETCH_SEND_REQUEST;
1407 }
1408 break;
1409 case FETCH_SEND_REQUEST:
1410 if (send_fetch_request(&negotiator, fd[1], args, ref,
1411 &common,
1412 &haves_to_send, &in_vain,
1413 reader.use_sideband))
1414 state = FETCH_GET_PACK;
1415 else
1416 state = FETCH_PROCESS_ACKS;
1417 break;
1418 case FETCH_PROCESS_ACKS:
1419 /* Process ACKs/NAKs */
1420 switch (process_acks(&negotiator, &reader, &common)) {
1421 case 2:
1422 state = FETCH_GET_PACK;
1423 break;
1424 case 1:
1425 in_vain = 0;
1426 /* fallthrough */
1427 default:
1428 state = FETCH_SEND_REQUEST;
1429 break;
1430 }
1431 break;
1432 case FETCH_GET_PACK:
1433 /* Check for shallow-info section */
1434 if (process_section_header(&reader, "shallow-info", 1))
1435 receive_shallow_info(args, &reader, shallows, si);
1436
1437 if (process_section_header(&reader, "wanted-refs", 1))
1438 receive_wanted_refs(&reader, sought, nr_sought);
1439
1440 /* get the pack */
1441 process_section_header(&reader, "packfile", 0);
1442 if (get_pack(args, fd, pack_lockfile))
1443 die(_("git fetch-pack: fetch failed."));
1444
1445 state = FETCH_DONE;
1446 break;
1447 case FETCH_DONE:
1448 continue;
1449 }
1450 }
1451
1452 negotiator.release(&negotiator);
1453 oidset_clear(&common);
1454 return ref;
1455 }
1456
1457 static int fetch_pack_config_cb(const char *var, const char *value, void *cb)
1458 {
1459 if (strcmp(var, "fetch.fsck.skiplist") == 0) {
1460 const char *path;
1461
1462 if (git_config_pathname(&path, var, value))
1463 return 1;
1464 strbuf_addf(&fsck_msg_types, "%cskiplist=%s",
1465 fsck_msg_types.len ? ',' : '=', path);
1466 free((char *)path);
1467 return 0;
1468 }
1469
1470 if (skip_prefix(var, "fetch.fsck.", &var)) {
1471 if (is_valid_msg_type(var, value))
1472 strbuf_addf(&fsck_msg_types, "%c%s=%s",
1473 fsck_msg_types.len ? ',' : '=', var, value);
1474 else
1475 warning("Skipping unknown msg id '%s'", var);
1476 return 0;
1477 }
1478
1479 return git_default_config(var, value, cb);
1480 }
1481
1482 static void fetch_pack_config(void)
1483 {
1484 git_config_get_int("fetch.unpacklimit", &fetch_unpack_limit);
1485 git_config_get_int("transfer.unpacklimit", &transfer_unpack_limit);
1486 git_config_get_bool("repack.usedeltabaseoffset", &prefer_ofs_delta);
1487 git_config_get_bool("fetch.fsckobjects", &fetch_fsck_objects);
1488 git_config_get_bool("transfer.fsckobjects", &transfer_fsck_objects);
1489 git_config_get_string("fetch.negotiationalgorithm",
1490 &negotiation_algorithm);
1491
1492 git_config(fetch_pack_config_cb, NULL);
1493 }
1494
1495 static void fetch_pack_setup(void)
1496 {
1497 static int did_setup;
1498 if (did_setup)
1499 return;
1500 fetch_pack_config();
1501 if (0 <= transfer_unpack_limit)
1502 unpack_limit = transfer_unpack_limit;
1503 else if (0 <= fetch_unpack_limit)
1504 unpack_limit = fetch_unpack_limit;
1505 did_setup = 1;
1506 }
1507
1508 static int remove_duplicates_in_refs(struct ref **ref, int nr)
1509 {
1510 struct string_list names = STRING_LIST_INIT_NODUP;
1511 int src, dst;
1512
1513 for (src = dst = 0; src < nr; src++) {
1514 struct string_list_item *item;
1515 item = string_list_insert(&names, ref[src]->name);
1516 if (item->util)
1517 continue; /* already have it */
1518 item->util = ref[src];
1519 if (src != dst)
1520 ref[dst] = ref[src];
1521 dst++;
1522 }
1523 for (src = dst; src < nr; src++)
1524 ref[src] = NULL;
1525 string_list_clear(&names, 0);
1526 return dst;
1527 }
1528
1529 static void update_shallow(struct fetch_pack_args *args,
1530 struct ref **sought, int nr_sought,
1531 struct shallow_info *si)
1532 {
1533 struct oid_array ref = OID_ARRAY_INIT;
1534 int *status;
1535 int i;
1536
1537 if (args->deepen && alternate_shallow_file) {
1538 if (*alternate_shallow_file == '\0') { /* --unshallow */
1539 unlink_or_warn(git_path_shallow(the_repository));
1540 rollback_lock_file(&shallow_lock);
1541 } else
1542 commit_lock_file(&shallow_lock);
1543 alternate_shallow_file = NULL;
1544 return;
1545 }
1546
1547 if (!si->shallow || !si->shallow->nr)
1548 return;
1549
1550 if (args->cloning) {
1551 /*
1552 * remote is shallow, but this is a clone, there are
1553 * no objects in repo to worry about. Accept any
1554 * shallow points that exist in the pack (iow in repo
1555 * after get_pack() and reprepare_packed_git())
1556 */
1557 struct oid_array extra = OID_ARRAY_INIT;
1558 struct object_id *oid = si->shallow->oid;
1559 for (i = 0; i < si->shallow->nr; i++)
1560 if (has_object_file(&oid[i]))
1561 oid_array_append(&extra, &oid[i]);
1562 if (extra.nr) {
1563 setup_alternate_shallow(&shallow_lock,
1564 &alternate_shallow_file,
1565 &extra);
1566 commit_lock_file(&shallow_lock);
1567 alternate_shallow_file = NULL;
1568 }
1569 oid_array_clear(&extra);
1570 return;
1571 }
1572
1573 if (!si->nr_ours && !si->nr_theirs)
1574 return;
1575
1576 remove_nonexistent_theirs_shallow(si);
1577 if (!si->nr_ours && !si->nr_theirs)
1578 return;
1579 for (i = 0; i < nr_sought; i++)
1580 oid_array_append(&ref, &sought[i]->old_oid);
1581 si->ref = &ref;
1582
1583 if (args->update_shallow) {
1584 /*
1585 * remote is also shallow, .git/shallow may be updated
1586 * so all refs can be accepted. Make sure we only add
1587 * shallow roots that are actually reachable from new
1588 * refs.
1589 */
1590 struct oid_array extra = OID_ARRAY_INIT;
1591 struct object_id *oid = si->shallow->oid;
1592 assign_shallow_commits_to_refs(si, NULL, NULL);
1593 if (!si->nr_ours && !si->nr_theirs) {
1594 oid_array_clear(&ref);
1595 return;
1596 }
1597 for (i = 0; i < si->nr_ours; i++)
1598 oid_array_append(&extra, &oid[si->ours[i]]);
1599 for (i = 0; i < si->nr_theirs; i++)
1600 oid_array_append(&extra, &oid[si->theirs[i]]);
1601 setup_alternate_shallow(&shallow_lock,
1602 &alternate_shallow_file,
1603 &extra);
1604 commit_lock_file(&shallow_lock);
1605 oid_array_clear(&extra);
1606 oid_array_clear(&ref);
1607 alternate_shallow_file = NULL;
1608 return;
1609 }
1610
1611 /*
1612 * remote is also shallow, check what ref is safe to update
1613 * without updating .git/shallow
1614 */
1615 status = xcalloc(nr_sought, sizeof(*status));
1616 assign_shallow_commits_to_refs(si, NULL, status);
1617 if (si->nr_ours || si->nr_theirs) {
1618 for (i = 0; i < nr_sought; i++)
1619 if (status[i])
1620 sought[i]->status = REF_STATUS_REJECT_SHALLOW;
1621 }
1622 free(status);
1623 oid_array_clear(&ref);
1624 }
1625
1626 static int iterate_ref_map(void *cb_data, struct object_id *oid)
1627 {
1628 struct ref **rm = cb_data;
1629 struct ref *ref = *rm;
1630
1631 if (!ref)
1632 return -1; /* end of the list */
1633 *rm = ref->next;
1634 oidcpy(oid, &ref->old_oid);
1635 return 0;
1636 }
1637
1638 struct ref *fetch_pack(struct fetch_pack_args *args,
1639 int fd[],
1640 const struct ref *ref,
1641 struct ref **sought, int nr_sought,
1642 struct oid_array *shallow,
1643 char **pack_lockfile,
1644 enum protocol_version version)
1645 {
1646 struct ref *ref_cpy;
1647 struct shallow_info si;
1648 struct oid_array shallows_scratch = OID_ARRAY_INIT;
1649
1650 fetch_pack_setup();
1651 if (nr_sought)
1652 nr_sought = remove_duplicates_in_refs(sought, nr_sought);
1653
1654 if (args->no_dependents && !args->filter_options.choice) {
1655 /*
1656 * The protocol does not support requesting that only the
1657 * wanted objects be sent, so approximate this by setting a
1658 * "blob:none" filter if no filter is already set. This works
1659 * for all object types: note that wanted blobs will still be
1660 * sent because they are directly specified as a "want".
1661 *
1662 * NEEDSWORK: Add an option in the protocol to request that
1663 * only the wanted objects be sent, and implement it.
1664 */
1665 parse_list_objects_filter(&args->filter_options, "blob:none");
1666 }
1667
1668 if (version != protocol_v2 && !ref) {
1669 packet_flush(fd[1]);
1670 die(_("no matching remote head"));
1671 }
1672 if (version == protocol_v2) {
1673 if (shallow->nr)
1674 BUG("Protocol V2 does not provide shallows at this point in the fetch");
1675 memset(&si, 0, sizeof(si));
1676 ref_cpy = do_fetch_pack_v2(args, fd, ref, sought, nr_sought,
1677 &shallows_scratch, &si,
1678 pack_lockfile);
1679 } else {
1680 prepare_shallow_info(&si, shallow);
1681 ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought,
1682 &si, pack_lockfile);
1683 }
1684 reprepare_packed_git(the_repository);
1685
1686 if (!args->cloning && args->deepen) {
1687 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1688 struct ref *iterator = ref_cpy;
1689 opt.shallow_file = alternate_shallow_file;
1690 if (args->deepen)
1691 opt.is_deepening_fetch = 1;
1692 if (check_connected(iterate_ref_map, &iterator, &opt)) {
1693 error(_("remote did not send all necessary objects"));
1694 free_refs(ref_cpy);
1695 ref_cpy = NULL;
1696 rollback_lock_file(&shallow_lock);
1697 goto cleanup;
1698 }
1699 args->connectivity_checked = 1;
1700 }
1701
1702 update_shallow(args, sought, nr_sought, &si);
1703 cleanup:
1704 clear_shallow_info(&si);
1705 oid_array_clear(&shallows_scratch);
1706 return ref_cpy;
1707 }
1708
1709 int report_unmatched_refs(struct ref **sought, int nr_sought)
1710 {
1711 int i, ret = 0;
1712
1713 for (i = 0; i < nr_sought; i++) {
1714 if (!sought[i])
1715 continue;
1716 switch (sought[i]->match_status) {
1717 case REF_MATCHED:
1718 continue;
1719 case REF_NOT_MATCHED:
1720 error(_("no such remote ref %s"), sought[i]->name);
1721 break;
1722 case REF_UNADVERTISED_NOT_ALLOWED:
1723 error(_("Server does not allow request for unadvertised object %s"),
1724 sought[i]->name);
1725 break;
1726 }
1727 ret = 1;
1728 }
1729 return ret;
1730 }
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