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pack-protocol.txt: accept error packets in any context
[thirdparty/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 write_or_die(fd, buf->buf, buf->len);
196 }
197
198 static void insert_one_alternate_object(struct fetch_negotiator *negotiator,
199 struct object *obj)
200 {
201 rev_list_insert_ref(negotiator, NULL, &obj->oid);
202 }
203
204 #define INITIAL_FLUSH 16
205 #define PIPESAFE_FLUSH 32
206 #define LARGE_FLUSH 16384
207
208 static int next_flush(int stateless_rpc, int count)
209 {
210 if (stateless_rpc) {
211 if (count < LARGE_FLUSH)
212 count <<= 1;
213 else
214 count = count * 11 / 10;
215 } else {
216 if (count < PIPESAFE_FLUSH)
217 count <<= 1;
218 else
219 count += PIPESAFE_FLUSH;
220 }
221 return count;
222 }
223
224 static void mark_tips(struct fetch_negotiator *negotiator,
225 const struct oid_array *negotiation_tips)
226 {
227 int i;
228
229 if (!negotiation_tips) {
230 for_each_ref(rev_list_insert_ref_oid, negotiator);
231 return;
232 }
233
234 for (i = 0; i < negotiation_tips->nr; i++)
235 rev_list_insert_ref(negotiator, NULL,
236 &negotiation_tips->oid[i]);
237 return;
238 }
239
240 static int find_common(struct fetch_negotiator *negotiator,
241 struct fetch_pack_args *args,
242 int fd[2], struct object_id *result_oid,
243 struct ref *refs)
244 {
245 int fetching;
246 int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval;
247 const struct object_id *oid;
248 unsigned in_vain = 0;
249 int got_continue = 0;
250 int got_ready = 0;
251 struct strbuf req_buf = STRBUF_INIT;
252 size_t state_len = 0;
253 struct packet_reader reader;
254
255 if (args->stateless_rpc && multi_ack == 1)
256 die(_("--stateless-rpc requires multi_ack_detailed"));
257
258 packet_reader_init(&reader, fd[0], NULL, 0,
259 PACKET_READ_CHOMP_NEWLINE |
260 PACKET_READ_DIE_ON_ERR_PACKET);
261
262 if (!args->no_dependents) {
263 mark_tips(negotiator, args->negotiation_tips);
264 for_each_cached_alternate(negotiator, insert_one_alternate_object);
265 }
266
267 fetching = 0;
268 for ( ; refs ; refs = refs->next) {
269 struct object_id *remote = &refs->old_oid;
270 const char *remote_hex;
271 struct object *o;
272
273 /*
274 * If that object is complete (i.e. it is an ancestor of a
275 * local ref), we tell them we have it but do not have to
276 * tell them about its ancestors, which they already know
277 * about.
278 *
279 * We use lookup_object here because we are only
280 * interested in the case we *know* the object is
281 * reachable and we have already scanned it.
282 *
283 * Do this only if args->no_dependents is false (if it is true,
284 * we cannot trust the object flags).
285 */
286 if (!args->no_dependents &&
287 ((o = lookup_object(the_repository, remote->hash)) != NULL) &&
288 (o->flags & COMPLETE)) {
289 continue;
290 }
291
292 remote_hex = oid_to_hex(remote);
293 if (!fetching) {
294 struct strbuf c = STRBUF_INIT;
295 if (multi_ack == 2) strbuf_addstr(&c, " multi_ack_detailed");
296 if (multi_ack == 1) strbuf_addstr(&c, " multi_ack");
297 if (no_done) strbuf_addstr(&c, " no-done");
298 if (use_sideband == 2) strbuf_addstr(&c, " side-band-64k");
299 if (use_sideband == 1) strbuf_addstr(&c, " side-band");
300 if (args->deepen_relative) strbuf_addstr(&c, " deepen-relative");
301 if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack");
302 if (args->no_progress) strbuf_addstr(&c, " no-progress");
303 if (args->include_tag) strbuf_addstr(&c, " include-tag");
304 if (prefer_ofs_delta) strbuf_addstr(&c, " ofs-delta");
305 if (deepen_since_ok) strbuf_addstr(&c, " deepen-since");
306 if (deepen_not_ok) strbuf_addstr(&c, " deepen-not");
307 if (agent_supported) strbuf_addf(&c, " agent=%s",
308 git_user_agent_sanitized());
309 if (args->filter_options.choice)
310 strbuf_addstr(&c, " filter");
311 packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
312 strbuf_release(&c);
313 } else
314 packet_buf_write(&req_buf, "want %s\n", remote_hex);
315 fetching++;
316 }
317
318 if (!fetching) {
319 strbuf_release(&req_buf);
320 packet_flush(fd[1]);
321 return 1;
322 }
323
324 if (is_repository_shallow(the_repository))
325 write_shallow_commits(&req_buf, 1, NULL);
326 if (args->depth > 0)
327 packet_buf_write(&req_buf, "deepen %d", args->depth);
328 if (args->deepen_since) {
329 timestamp_t max_age = approxidate(args->deepen_since);
330 packet_buf_write(&req_buf, "deepen-since %"PRItime, max_age);
331 }
332 if (args->deepen_not) {
333 int i;
334 for (i = 0; i < args->deepen_not->nr; i++) {
335 struct string_list_item *s = args->deepen_not->items + i;
336 packet_buf_write(&req_buf, "deepen-not %s", s->string);
337 }
338 }
339 if (server_supports_filtering && args->filter_options.choice)
340 packet_buf_write(&req_buf, "filter %s",
341 args->filter_options.filter_spec);
342 packet_buf_flush(&req_buf);
343 state_len = req_buf.len;
344
345 if (args->deepen) {
346 const char *arg;
347 struct object_id oid;
348
349 send_request(args, fd[1], &req_buf);
350 while (packet_reader_read(&reader) == PACKET_READ_NORMAL) {
351 if (skip_prefix(reader.line, "shallow ", &arg)) {
352 if (get_oid_hex(arg, &oid))
353 die(_("invalid shallow line: %s"), reader.line);
354 register_shallow(the_repository, &oid);
355 continue;
356 }
357 if (skip_prefix(reader.line, "unshallow ", &arg)) {
358 if (get_oid_hex(arg, &oid))
359 die(_("invalid unshallow line: %s"), reader.line);
360 if (!lookup_object(the_repository, oid.hash))
361 die(_("object not found: %s"), reader.line);
362 /* make sure that it is parsed as shallow */
363 if (!parse_object(the_repository, &oid))
364 die(_("error in object: %s"), reader.line);
365 if (unregister_shallow(&oid))
366 die(_("no shallow found: %s"), reader.line);
367 continue;
368 }
369 die(_("expected shallow/unshallow, got %s"), reader.line);
370 }
371 } else if (!args->stateless_rpc)
372 send_request(args, fd[1], &req_buf);
373
374 if (!args->stateless_rpc) {
375 /* If we aren't using the stateless-rpc interface
376 * we don't need to retain the headers.
377 */
378 strbuf_setlen(&req_buf, 0);
379 state_len = 0;
380 }
381
382 flushes = 0;
383 retval = -1;
384 if (args->no_dependents)
385 goto done;
386 while ((oid = negotiator->next(negotiator))) {
387 packet_buf_write(&req_buf, "have %s\n", oid_to_hex(oid));
388 print_verbose(args, "have %s", oid_to_hex(oid));
389 in_vain++;
390 if (flush_at <= ++count) {
391 int ack;
392
393 packet_buf_flush(&req_buf);
394 send_request(args, fd[1], &req_buf);
395 strbuf_setlen(&req_buf, state_len);
396 flushes++;
397 flush_at = next_flush(args->stateless_rpc, count);
398
399 /*
400 * We keep one window "ahead" of the other side, and
401 * will wait for an ACK only on the next one
402 */
403 if (!args->stateless_rpc && count == INITIAL_FLUSH)
404 continue;
405
406 consume_shallow_list(args, &reader);
407 do {
408 ack = get_ack(&reader, result_oid);
409 if (ack)
410 print_verbose(args, _("got %s %d %s"), "ack",
411 ack, oid_to_hex(result_oid));
412 switch (ack) {
413 case ACK:
414 flushes = 0;
415 multi_ack = 0;
416 retval = 0;
417 goto done;
418 case ACK_common:
419 case ACK_ready:
420 case ACK_continue: {
421 struct commit *commit =
422 lookup_commit(the_repository,
423 result_oid);
424 int was_common;
425
426 if (!commit)
427 die(_("invalid commit %s"), oid_to_hex(result_oid));
428 was_common = negotiator->ack(negotiator, commit);
429 if (args->stateless_rpc
430 && ack == ACK_common
431 && !was_common) {
432 /* We need to replay the have for this object
433 * on the next RPC request so the peer knows
434 * it is in common with us.
435 */
436 const char *hex = oid_to_hex(result_oid);
437 packet_buf_write(&req_buf, "have %s\n", hex);
438 state_len = req_buf.len;
439 /*
440 * Reset in_vain because an ack
441 * for this commit has not been
442 * seen.
443 */
444 in_vain = 0;
445 } else if (!args->stateless_rpc
446 || ack != ACK_common)
447 in_vain = 0;
448 retval = 0;
449 got_continue = 1;
450 if (ack == ACK_ready)
451 got_ready = 1;
452 break;
453 }
454 }
455 } while (ack);
456 flushes--;
457 if (got_continue && MAX_IN_VAIN < in_vain) {
458 print_verbose(args, _("giving up"));
459 break; /* give up */
460 }
461 if (got_ready)
462 break;
463 }
464 }
465 done:
466 if (!got_ready || !no_done) {
467 packet_buf_write(&req_buf, "done\n");
468 send_request(args, fd[1], &req_buf);
469 }
470 print_verbose(args, _("done"));
471 if (retval != 0) {
472 multi_ack = 0;
473 flushes++;
474 }
475 strbuf_release(&req_buf);
476
477 if (!got_ready || !no_done)
478 consume_shallow_list(args, &reader);
479 while (flushes || multi_ack) {
480 int ack = get_ack(&reader, result_oid);
481 if (ack) {
482 print_verbose(args, _("got %s (%d) %s"), "ack",
483 ack, oid_to_hex(result_oid));
484 if (ack == ACK)
485 return 0;
486 multi_ack = 1;
487 continue;
488 }
489 flushes--;
490 }
491 /* it is no error to fetch into a completely empty repo */
492 return count ? retval : 0;
493 }
494
495 static struct commit_list *complete;
496
497 static int mark_complete(const struct object_id *oid)
498 {
499 struct object *o = parse_object(the_repository, oid);
500
501 while (o && o->type == OBJ_TAG) {
502 struct tag *t = (struct tag *) o;
503 if (!t->tagged)
504 break; /* broken repository */
505 o->flags |= COMPLETE;
506 o = parse_object(the_repository, &t->tagged->oid);
507 }
508 if (o && o->type == OBJ_COMMIT) {
509 struct commit *commit = (struct commit *)o;
510 if (!(commit->object.flags & COMPLETE)) {
511 commit->object.flags |= COMPLETE;
512 commit_list_insert(commit, &complete);
513 }
514 }
515 return 0;
516 }
517
518 static int mark_complete_oid(const char *refname, const struct object_id *oid,
519 int flag, void *cb_data)
520 {
521 return mark_complete(oid);
522 }
523
524 static void mark_recent_complete_commits(struct fetch_pack_args *args,
525 timestamp_t cutoff)
526 {
527 while (complete && cutoff <= complete->item->date) {
528 print_verbose(args, _("Marking %s as complete"),
529 oid_to_hex(&complete->item->object.oid));
530 pop_most_recent_commit(&complete, COMPLETE);
531 }
532 }
533
534 static void add_refs_to_oidset(struct oidset *oids, struct ref *refs)
535 {
536 for (; refs; refs = refs->next)
537 oidset_insert(oids, &refs->old_oid);
538 }
539
540 static int is_unmatched_ref(const struct ref *ref)
541 {
542 struct object_id oid;
543 const char *p;
544 return ref->match_status == REF_NOT_MATCHED &&
545 !parse_oid_hex(ref->name, &oid, &p) &&
546 *p == '\0' &&
547 oideq(&oid, &ref->old_oid);
548 }
549
550 static void filter_refs(struct fetch_pack_args *args,
551 struct ref **refs,
552 struct ref **sought, int nr_sought)
553 {
554 struct ref *newlist = NULL;
555 struct ref **newtail = &newlist;
556 struct ref *unmatched = NULL;
557 struct ref *ref, *next;
558 struct oidset tip_oids = OIDSET_INIT;
559 int i;
560 int strict = !(allow_unadvertised_object_request &
561 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
562
563 i = 0;
564 for (ref = *refs; ref; ref = next) {
565 int keep = 0;
566 next = ref->next;
567
568 if (starts_with(ref->name, "refs/") &&
569 check_refname_format(ref->name, 0))
570 ; /* trash */
571 else {
572 while (i < nr_sought) {
573 int cmp = strcmp(ref->name, sought[i]->name);
574 if (cmp < 0)
575 break; /* definitely do not have it */
576 else if (cmp == 0) {
577 keep = 1; /* definitely have it */
578 sought[i]->match_status = REF_MATCHED;
579 }
580 i++;
581 }
582
583 if (!keep && args->fetch_all &&
584 (!args->deepen || !starts_with(ref->name, "refs/tags/")))
585 keep = 1;
586 }
587
588 if (keep) {
589 *newtail = ref;
590 ref->next = NULL;
591 newtail = &ref->next;
592 } else {
593 ref->next = unmatched;
594 unmatched = ref;
595 }
596 }
597
598 if (strict) {
599 for (i = 0; i < nr_sought; i++) {
600 ref = sought[i];
601 if (!is_unmatched_ref(ref))
602 continue;
603
604 add_refs_to_oidset(&tip_oids, unmatched);
605 add_refs_to_oidset(&tip_oids, newlist);
606 break;
607 }
608 }
609
610 /* Append unmatched requests to the list */
611 for (i = 0; i < nr_sought; i++) {
612 ref = sought[i];
613 if (!is_unmatched_ref(ref))
614 continue;
615
616 if (!strict || oidset_contains(&tip_oids, &ref->old_oid)) {
617 ref->match_status = REF_MATCHED;
618 *newtail = copy_ref(ref);
619 newtail = &(*newtail)->next;
620 } else {
621 ref->match_status = REF_UNADVERTISED_NOT_ALLOWED;
622 }
623 }
624
625 oidset_clear(&tip_oids);
626 for (ref = unmatched; ref; ref = next) {
627 next = ref->next;
628 free(ref);
629 }
630
631 *refs = newlist;
632 }
633
634 static void mark_alternate_complete(struct fetch_negotiator *unused,
635 struct object *obj)
636 {
637 mark_complete(&obj->oid);
638 }
639
640 struct loose_object_iter {
641 struct oidset *loose_object_set;
642 struct ref *refs;
643 };
644
645 /*
646 * If the number of refs is not larger than the number of loose objects,
647 * this function stops inserting.
648 */
649 static int add_loose_objects_to_set(const struct object_id *oid,
650 const char *path,
651 void *data)
652 {
653 struct loose_object_iter *iter = data;
654 oidset_insert(iter->loose_object_set, oid);
655 if (iter->refs == NULL)
656 return 1;
657
658 iter->refs = iter->refs->next;
659 return 0;
660 }
661
662 /*
663 * Mark recent commits available locally and reachable from a local ref as
664 * COMPLETE. If args->no_dependents is false, also mark COMPLETE remote refs as
665 * COMMON_REF (otherwise, we are not planning to participate in negotiation, and
666 * thus do not need COMMON_REF marks).
667 *
668 * The cutoff time for recency is determined by this heuristic: it is the
669 * earliest commit time of the objects in refs that are commits and that we know
670 * the commit time of.
671 */
672 static void mark_complete_and_common_ref(struct fetch_negotiator *negotiator,
673 struct fetch_pack_args *args,
674 struct ref **refs)
675 {
676 struct ref *ref;
677 int old_save_commit_buffer = save_commit_buffer;
678 timestamp_t cutoff = 0;
679 struct oidset loose_oid_set = OIDSET_INIT;
680 int use_oidset = 0;
681 struct loose_object_iter iter = {&loose_oid_set, *refs};
682
683 /* Enumerate all loose objects or know refs are not so many. */
684 use_oidset = !for_each_loose_object(add_loose_objects_to_set,
685 &iter, 0);
686
687 save_commit_buffer = 0;
688
689 for (ref = *refs; ref; ref = ref->next) {
690 struct object *o;
691 unsigned int flags = OBJECT_INFO_QUICK;
692
693 if (use_oidset &&
694 !oidset_contains(&loose_oid_set, &ref->old_oid)) {
695 /*
696 * I know this does not exist in the loose form,
697 * so check if it exists in a non-loose form.
698 */
699 flags |= OBJECT_INFO_IGNORE_LOOSE;
700 }
701
702 if (!has_object_file_with_flags(&ref->old_oid, flags))
703 continue;
704 o = parse_object(the_repository, &ref->old_oid);
705 if (!o)
706 continue;
707
708 /* We already have it -- which may mean that we were
709 * in sync with the other side at some time after
710 * that (it is OK if we guess wrong here).
711 */
712 if (o->type == OBJ_COMMIT) {
713 struct commit *commit = (struct commit *)o;
714 if (!cutoff || cutoff < commit->date)
715 cutoff = commit->date;
716 }
717 }
718
719 oidset_clear(&loose_oid_set);
720
721 if (!args->deepen) {
722 for_each_ref(mark_complete_oid, NULL);
723 for_each_cached_alternate(NULL, mark_alternate_complete);
724 commit_list_sort_by_date(&complete);
725 if (cutoff)
726 mark_recent_complete_commits(args, cutoff);
727 }
728
729 /*
730 * Mark all complete remote refs as common refs.
731 * Don't mark them common yet; the server has to be told so first.
732 */
733 for (ref = *refs; ref; ref = ref->next) {
734 struct object *o = deref_tag(the_repository,
735 lookup_object(the_repository,
736 ref->old_oid.hash),
737 NULL, 0);
738
739 if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE))
740 continue;
741
742 negotiator->known_common(negotiator,
743 (struct commit *)o);
744 }
745
746 save_commit_buffer = old_save_commit_buffer;
747 }
748
749 /*
750 * Returns 1 if every object pointed to by the given remote refs is available
751 * locally and reachable from a local ref, and 0 otherwise.
752 */
753 static int everything_local(struct fetch_pack_args *args,
754 struct ref **refs)
755 {
756 struct ref *ref;
757 int retval;
758
759 for (retval = 1, ref = *refs; ref ; ref = ref->next) {
760 const struct object_id *remote = &ref->old_oid;
761 struct object *o;
762
763 o = lookup_object(the_repository, remote->hash);
764 if (!o || !(o->flags & COMPLETE)) {
765 retval = 0;
766 print_verbose(args, "want %s (%s)", oid_to_hex(remote),
767 ref->name);
768 continue;
769 }
770 print_verbose(args, _("already have %s (%s)"), oid_to_hex(remote),
771 ref->name);
772 }
773
774 return retval;
775 }
776
777 static int sideband_demux(int in, int out, void *data)
778 {
779 int *xd = data;
780 int ret;
781
782 ret = recv_sideband("fetch-pack", xd[0], out);
783 close(out);
784 return ret;
785 }
786
787 static int get_pack(struct fetch_pack_args *args,
788 int xd[2], char **pack_lockfile)
789 {
790 struct async demux;
791 int do_keep = args->keep_pack;
792 const char *cmd_name;
793 struct pack_header header;
794 int pass_header = 0;
795 struct child_process cmd = CHILD_PROCESS_INIT;
796 int ret;
797
798 memset(&demux, 0, sizeof(demux));
799 if (use_sideband) {
800 /* xd[] is talking with upload-pack; subprocess reads from
801 * xd[0], spits out band#2 to stderr, and feeds us band#1
802 * through demux->out.
803 */
804 demux.proc = sideband_demux;
805 demux.data = xd;
806 demux.out = -1;
807 demux.isolate_sigpipe = 1;
808 if (start_async(&demux))
809 die(_("fetch-pack: unable to fork off sideband demultiplexer"));
810 }
811 else
812 demux.out = xd[0];
813
814 if (!args->keep_pack && unpack_limit) {
815
816 if (read_pack_header(demux.out, &header))
817 die(_("protocol error: bad pack header"));
818 pass_header = 1;
819 if (ntohl(header.hdr_entries) < unpack_limit)
820 do_keep = 0;
821 else
822 do_keep = 1;
823 }
824
825 if (alternate_shallow_file) {
826 argv_array_push(&cmd.args, "--shallow-file");
827 argv_array_push(&cmd.args, alternate_shallow_file);
828 }
829
830 if (do_keep || args->from_promisor) {
831 if (pack_lockfile)
832 cmd.out = -1;
833 cmd_name = "index-pack";
834 argv_array_push(&cmd.args, cmd_name);
835 argv_array_push(&cmd.args, "--stdin");
836 if (!args->quiet && !args->no_progress)
837 argv_array_push(&cmd.args, "-v");
838 if (args->use_thin_pack)
839 argv_array_push(&cmd.args, "--fix-thin");
840 if (do_keep && (args->lock_pack || unpack_limit)) {
841 char hostname[HOST_NAME_MAX + 1];
842 if (xgethostname(hostname, sizeof(hostname)))
843 xsnprintf(hostname, sizeof(hostname), "localhost");
844 argv_array_pushf(&cmd.args,
845 "--keep=fetch-pack %"PRIuMAX " on %s",
846 (uintmax_t)getpid(), hostname);
847 }
848 if (args->check_self_contained_and_connected)
849 argv_array_push(&cmd.args, "--check-self-contained-and-connected");
850 if (args->from_promisor)
851 argv_array_push(&cmd.args, "--promisor");
852 }
853 else {
854 cmd_name = "unpack-objects";
855 argv_array_push(&cmd.args, cmd_name);
856 if (args->quiet || args->no_progress)
857 argv_array_push(&cmd.args, "-q");
858 args->check_self_contained_and_connected = 0;
859 }
860
861 if (pass_header)
862 argv_array_pushf(&cmd.args, "--pack_header=%"PRIu32",%"PRIu32,
863 ntohl(header.hdr_version),
864 ntohl(header.hdr_entries));
865 if (fetch_fsck_objects >= 0
866 ? fetch_fsck_objects
867 : transfer_fsck_objects >= 0
868 ? transfer_fsck_objects
869 : 0) {
870 if (args->from_promisor)
871 /*
872 * We cannot use --strict in index-pack because it
873 * checks both broken objects and links, but we only
874 * want to check for broken objects.
875 */
876 argv_array_push(&cmd.args, "--fsck-objects");
877 else
878 argv_array_pushf(&cmd.args, "--strict%s",
879 fsck_msg_types.buf);
880 }
881
882 cmd.in = demux.out;
883 cmd.git_cmd = 1;
884 if (start_command(&cmd))
885 die(_("fetch-pack: unable to fork off %s"), cmd_name);
886 if (do_keep && pack_lockfile) {
887 *pack_lockfile = index_pack_lockfile(cmd.out);
888 close(cmd.out);
889 }
890
891 if (!use_sideband)
892 /* Closed by start_command() */
893 xd[0] = -1;
894
895 ret = finish_command(&cmd);
896 if (!ret || (args->check_self_contained_and_connected && ret == 1))
897 args->self_contained_and_connected =
898 args->check_self_contained_and_connected &&
899 ret == 0;
900 else
901 die(_("%s failed"), cmd_name);
902 if (use_sideband && finish_async(&demux))
903 die(_("error in sideband demultiplexer"));
904 return 0;
905 }
906
907 static int cmp_ref_by_name(const void *a_, const void *b_)
908 {
909 const struct ref *a = *((const struct ref **)a_);
910 const struct ref *b = *((const struct ref **)b_);
911 return strcmp(a->name, b->name);
912 }
913
914 static struct ref *do_fetch_pack(struct fetch_pack_args *args,
915 int fd[2],
916 const struct ref *orig_ref,
917 struct ref **sought, int nr_sought,
918 struct shallow_info *si,
919 char **pack_lockfile)
920 {
921 struct ref *ref = copy_ref_list(orig_ref);
922 struct object_id oid;
923 const char *agent_feature;
924 int agent_len;
925 struct fetch_negotiator negotiator;
926 fetch_negotiator_init(&negotiator, negotiation_algorithm);
927
928 sort_ref_list(&ref, ref_compare_name);
929 QSORT(sought, nr_sought, cmp_ref_by_name);
930
931 if ((args->depth > 0 || is_repository_shallow(the_repository)) && !server_supports("shallow"))
932 die(_("Server does not support shallow clients"));
933 if (args->depth > 0 || args->deepen_since || args->deepen_not)
934 args->deepen = 1;
935 if (server_supports("multi_ack_detailed")) {
936 print_verbose(args, _("Server supports multi_ack_detailed"));
937 multi_ack = 2;
938 if (server_supports("no-done")) {
939 print_verbose(args, _("Server supports no-done"));
940 if (args->stateless_rpc)
941 no_done = 1;
942 }
943 }
944 else if (server_supports("multi_ack")) {
945 print_verbose(args, _("Server supports multi_ack"));
946 multi_ack = 1;
947 }
948 if (server_supports("side-band-64k")) {
949 print_verbose(args, _("Server supports side-band-64k"));
950 use_sideband = 2;
951 }
952 else if (server_supports("side-band")) {
953 print_verbose(args, _("Server supports side-band"));
954 use_sideband = 1;
955 }
956 if (server_supports("allow-tip-sha1-in-want")) {
957 print_verbose(args, _("Server supports allow-tip-sha1-in-want"));
958 allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
959 }
960 if (server_supports("allow-reachable-sha1-in-want")) {
961 print_verbose(args, _("Server supports allow-reachable-sha1-in-want"));
962 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
963 }
964 if (!server_supports("thin-pack"))
965 args->use_thin_pack = 0;
966 if (!server_supports("no-progress"))
967 args->no_progress = 0;
968 if (!server_supports("include-tag"))
969 args->include_tag = 0;
970 if (server_supports("ofs-delta"))
971 print_verbose(args, _("Server supports ofs-delta"));
972 else
973 prefer_ofs_delta = 0;
974
975 if (server_supports("filter")) {
976 server_supports_filtering = 1;
977 print_verbose(args, _("Server supports filter"));
978 } else if (args->filter_options.choice) {
979 warning("filtering not recognized by server, ignoring");
980 }
981
982 if ((agent_feature = server_feature_value("agent", &agent_len))) {
983 agent_supported = 1;
984 if (agent_len)
985 print_verbose(args, _("Server version is %.*s"),
986 agent_len, agent_feature);
987 }
988 if (server_supports("deepen-since"))
989 deepen_since_ok = 1;
990 else if (args->deepen_since)
991 die(_("Server does not support --shallow-since"));
992 if (server_supports("deepen-not"))
993 deepen_not_ok = 1;
994 else if (args->deepen_not)
995 die(_("Server does not support --shallow-exclude"));
996 if (!server_supports("deepen-relative") && args->deepen_relative)
997 die(_("Server does not support --deepen"));
998
999 if (!args->no_dependents) {
1000 mark_complete_and_common_ref(&negotiator, args, &ref);
1001 filter_refs(args, &ref, sought, nr_sought);
1002 if (everything_local(args, &ref)) {
1003 packet_flush(fd[1]);
1004 goto all_done;
1005 }
1006 } else {
1007 filter_refs(args, &ref, sought, nr_sought);
1008 }
1009 if (find_common(&negotiator, args, fd, &oid, ref) < 0)
1010 if (!args->keep_pack)
1011 /* When cloning, it is not unusual to have
1012 * no common commit.
1013 */
1014 warning(_("no common commits"));
1015
1016 if (args->stateless_rpc)
1017 packet_flush(fd[1]);
1018 if (args->deepen)
1019 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
1020 NULL);
1021 else if (si->nr_ours || si->nr_theirs)
1022 alternate_shallow_file = setup_temporary_shallow(si->shallow);
1023 else
1024 alternate_shallow_file = NULL;
1025 if (get_pack(args, fd, pack_lockfile))
1026 die(_("git fetch-pack: fetch failed."));
1027
1028 all_done:
1029 negotiator.release(&negotiator);
1030 return ref;
1031 }
1032
1033 static void add_shallow_requests(struct strbuf *req_buf,
1034 const struct fetch_pack_args *args)
1035 {
1036 if (is_repository_shallow(the_repository))
1037 write_shallow_commits(req_buf, 1, NULL);
1038 if (args->depth > 0)
1039 packet_buf_write(req_buf, "deepen %d", args->depth);
1040 if (args->deepen_since) {
1041 timestamp_t max_age = approxidate(args->deepen_since);
1042 packet_buf_write(req_buf, "deepen-since %"PRItime, max_age);
1043 }
1044 if (args->deepen_not) {
1045 int i;
1046 for (i = 0; i < args->deepen_not->nr; i++) {
1047 struct string_list_item *s = args->deepen_not->items + i;
1048 packet_buf_write(req_buf, "deepen-not %s", s->string);
1049 }
1050 }
1051 }
1052
1053 static void add_wants(int no_dependents, const struct ref *wants, struct strbuf *req_buf)
1054 {
1055 int use_ref_in_want = server_supports_feature("fetch", "ref-in-want", 0);
1056
1057 for ( ; wants ; wants = wants->next) {
1058 const struct object_id *remote = &wants->old_oid;
1059 struct object *o;
1060
1061 /*
1062 * If that object is complete (i.e. it is an ancestor of a
1063 * local ref), we tell them we have it but do not have to
1064 * tell them about its ancestors, which they already know
1065 * about.
1066 *
1067 * We use lookup_object here because we are only
1068 * interested in the case we *know* the object is
1069 * reachable and we have already scanned it.
1070 *
1071 * Do this only if args->no_dependents is false (if it is true,
1072 * we cannot trust the object flags).
1073 */
1074 if (!no_dependents &&
1075 ((o = lookup_object(the_repository, remote->hash)) != NULL) &&
1076 (o->flags & COMPLETE)) {
1077 continue;
1078 }
1079
1080 if (!use_ref_in_want || wants->exact_oid)
1081 packet_buf_write(req_buf, "want %s\n", oid_to_hex(remote));
1082 else
1083 packet_buf_write(req_buf, "want-ref %s\n", wants->name);
1084 }
1085 }
1086
1087 static void add_common(struct strbuf *req_buf, struct oidset *common)
1088 {
1089 struct oidset_iter iter;
1090 const struct object_id *oid;
1091 oidset_iter_init(common, &iter);
1092
1093 while ((oid = oidset_iter_next(&iter))) {
1094 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1095 }
1096 }
1097
1098 static int add_haves(struct fetch_negotiator *negotiator,
1099 struct strbuf *req_buf,
1100 int *haves_to_send, int *in_vain)
1101 {
1102 int ret = 0;
1103 int haves_added = 0;
1104 const struct object_id *oid;
1105
1106 while ((oid = negotiator->next(negotiator))) {
1107 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1108 if (++haves_added >= *haves_to_send)
1109 break;
1110 }
1111
1112 *in_vain += haves_added;
1113 if (!haves_added || *in_vain >= MAX_IN_VAIN) {
1114 /* Send Done */
1115 packet_buf_write(req_buf, "done\n");
1116 ret = 1;
1117 }
1118
1119 /* Increase haves to send on next round */
1120 *haves_to_send = next_flush(1, *haves_to_send);
1121
1122 return ret;
1123 }
1124
1125 static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out,
1126 const struct fetch_pack_args *args,
1127 const struct ref *wants, struct oidset *common,
1128 int *haves_to_send, int *in_vain)
1129 {
1130 int ret = 0;
1131 struct strbuf req_buf = STRBUF_INIT;
1132
1133 if (server_supports_v2("fetch", 1))
1134 packet_buf_write(&req_buf, "command=fetch");
1135 if (server_supports_v2("agent", 0))
1136 packet_buf_write(&req_buf, "agent=%s", git_user_agent_sanitized());
1137 if (args->server_options && args->server_options->nr &&
1138 server_supports_v2("server-option", 1)) {
1139 int i;
1140 for (i = 0; i < args->server_options->nr; i++)
1141 packet_write_fmt(fd_out, "server-option=%s",
1142 args->server_options->items[i].string);
1143 }
1144
1145 packet_buf_delim(&req_buf);
1146 if (args->use_thin_pack)
1147 packet_buf_write(&req_buf, "thin-pack");
1148 if (args->no_progress)
1149 packet_buf_write(&req_buf, "no-progress");
1150 if (args->include_tag)
1151 packet_buf_write(&req_buf, "include-tag");
1152 if (prefer_ofs_delta)
1153 packet_buf_write(&req_buf, "ofs-delta");
1154
1155 /* Add shallow-info and deepen request */
1156 if (server_supports_feature("fetch", "shallow", 0))
1157 add_shallow_requests(&req_buf, args);
1158 else if (is_repository_shallow(the_repository) || args->deepen)
1159 die(_("Server does not support shallow requests"));
1160
1161 /* Add filter */
1162 if (server_supports_feature("fetch", "filter", 0) &&
1163 args->filter_options.choice) {
1164 print_verbose(args, _("Server supports filter"));
1165 packet_buf_write(&req_buf, "filter %s",
1166 args->filter_options.filter_spec);
1167 } else if (args->filter_options.choice) {
1168 warning("filtering not recognized by server, ignoring");
1169 }
1170
1171 /* add wants */
1172 add_wants(args->no_dependents, wants, &req_buf);
1173
1174 if (args->no_dependents) {
1175 packet_buf_write(&req_buf, "done");
1176 ret = 1;
1177 } else {
1178 /* Add all of the common commits we've found in previous rounds */
1179 add_common(&req_buf, common);
1180
1181 /* Add initial haves */
1182 ret = add_haves(negotiator, &req_buf, haves_to_send, in_vain);
1183 }
1184
1185 /* Send request */
1186 packet_buf_flush(&req_buf);
1187 write_or_die(fd_out, req_buf.buf, req_buf.len);
1188
1189 strbuf_release(&req_buf);
1190 return ret;
1191 }
1192
1193 /*
1194 * Processes a section header in a server's response and checks if it matches
1195 * `section`. If the value of `peek` is 1, the header line will be peeked (and
1196 * not consumed); if 0, the line will be consumed and the function will die if
1197 * the section header doesn't match what was expected.
1198 */
1199 static int process_section_header(struct packet_reader *reader,
1200 const char *section, int peek)
1201 {
1202 int ret;
1203
1204 if (packet_reader_peek(reader) != PACKET_READ_NORMAL)
1205 die(_("error reading section header '%s'"), section);
1206
1207 ret = !strcmp(reader->line, section);
1208
1209 if (!peek) {
1210 if (!ret)
1211 die(_("expected '%s', received '%s'"),
1212 section, reader->line);
1213 packet_reader_read(reader);
1214 }
1215
1216 return ret;
1217 }
1218
1219 static int process_acks(struct fetch_negotiator *negotiator,
1220 struct packet_reader *reader,
1221 struct oidset *common)
1222 {
1223 /* received */
1224 int received_ready = 0;
1225 int received_ack = 0;
1226
1227 process_section_header(reader, "acknowledgments", 0);
1228 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1229 const char *arg;
1230
1231 if (!strcmp(reader->line, "NAK"))
1232 continue;
1233
1234 if (skip_prefix(reader->line, "ACK ", &arg)) {
1235 struct object_id oid;
1236 if (!get_oid_hex(arg, &oid)) {
1237 struct commit *commit;
1238 oidset_insert(common, &oid);
1239 commit = lookup_commit(the_repository, &oid);
1240 negotiator->ack(negotiator, commit);
1241 }
1242 continue;
1243 }
1244
1245 if (!strcmp(reader->line, "ready")) {
1246 received_ready = 1;
1247 continue;
1248 }
1249
1250 die(_("unexpected acknowledgment line: '%s'"), reader->line);
1251 }
1252
1253 if (reader->status != PACKET_READ_FLUSH &&
1254 reader->status != PACKET_READ_DELIM)
1255 die(_("error processing acks: %d"), reader->status);
1256
1257 /*
1258 * If an "acknowledgments" section is sent, a packfile is sent if and
1259 * only if "ready" was sent in this section. The other sections
1260 * ("shallow-info" and "wanted-refs") are sent only if a packfile is
1261 * sent. Therefore, a DELIM is expected if "ready" is sent, and a FLUSH
1262 * otherwise.
1263 */
1264 if (received_ready && reader->status != PACKET_READ_DELIM)
1265 die(_("expected packfile to be sent after 'ready'"));
1266 if (!received_ready && reader->status != PACKET_READ_FLUSH)
1267 die(_("expected no other sections to be sent after no 'ready'"));
1268
1269 /* return 0 if no common, 1 if there are common, or 2 if ready */
1270 return received_ready ? 2 : (received_ack ? 1 : 0);
1271 }
1272
1273 static void receive_shallow_info(struct fetch_pack_args *args,
1274 struct packet_reader *reader)
1275 {
1276 process_section_header(reader, "shallow-info", 0);
1277 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1278 const char *arg;
1279 struct object_id oid;
1280
1281 if (skip_prefix(reader->line, "shallow ", &arg)) {
1282 if (get_oid_hex(arg, &oid))
1283 die(_("invalid shallow line: %s"), reader->line);
1284 register_shallow(the_repository, &oid);
1285 continue;
1286 }
1287 if (skip_prefix(reader->line, "unshallow ", &arg)) {
1288 if (get_oid_hex(arg, &oid))
1289 die(_("invalid unshallow line: %s"), reader->line);
1290 if (!lookup_object(the_repository, oid.hash))
1291 die(_("object not found: %s"), reader->line);
1292 /* make sure that it is parsed as shallow */
1293 if (!parse_object(the_repository, &oid))
1294 die(_("error in object: %s"), reader->line);
1295 if (unregister_shallow(&oid))
1296 die(_("no shallow found: %s"), reader->line);
1297 continue;
1298 }
1299 die(_("expected shallow/unshallow, got %s"), reader->line);
1300 }
1301
1302 if (reader->status != PACKET_READ_FLUSH &&
1303 reader->status != PACKET_READ_DELIM)
1304 die(_("error processing shallow info: %d"), reader->status);
1305
1306 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file, NULL);
1307 args->deepen = 1;
1308 }
1309
1310 static void receive_wanted_refs(struct packet_reader *reader,
1311 struct ref **sought, int nr_sought)
1312 {
1313 process_section_header(reader, "wanted-refs", 0);
1314 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1315 struct object_id oid;
1316 const char *end;
1317 int i;
1318
1319 if (parse_oid_hex(reader->line, &oid, &end) || *end++ != ' ')
1320 die(_("expected wanted-ref, got '%s'"), reader->line);
1321
1322 for (i = 0; i < nr_sought; i++) {
1323 if (!strcmp(end, sought[i]->name)) {
1324 oidcpy(&sought[i]->old_oid, &oid);
1325 break;
1326 }
1327 }
1328
1329 if (i == nr_sought)
1330 die(_("unexpected wanted-ref: '%s'"), reader->line);
1331 }
1332
1333 if (reader->status != PACKET_READ_DELIM)
1334 die(_("error processing wanted refs: %d"), reader->status);
1335 }
1336
1337 enum fetch_state {
1338 FETCH_CHECK_LOCAL = 0,
1339 FETCH_SEND_REQUEST,
1340 FETCH_PROCESS_ACKS,
1341 FETCH_GET_PACK,
1342 FETCH_DONE,
1343 };
1344
1345 static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
1346 int fd[2],
1347 const struct ref *orig_ref,
1348 struct ref **sought, int nr_sought,
1349 char **pack_lockfile)
1350 {
1351 struct ref *ref = copy_ref_list(orig_ref);
1352 enum fetch_state state = FETCH_CHECK_LOCAL;
1353 struct oidset common = OIDSET_INIT;
1354 struct packet_reader reader;
1355 int in_vain = 0;
1356 int haves_to_send = INITIAL_FLUSH;
1357 struct fetch_negotiator negotiator;
1358 fetch_negotiator_init(&negotiator, negotiation_algorithm);
1359 packet_reader_init(&reader, fd[0], NULL, 0,
1360 PACKET_READ_CHOMP_NEWLINE |
1361 PACKET_READ_DIE_ON_ERR_PACKET);
1362
1363 while (state != FETCH_DONE) {
1364 switch (state) {
1365 case FETCH_CHECK_LOCAL:
1366 sort_ref_list(&ref, ref_compare_name);
1367 QSORT(sought, nr_sought, cmp_ref_by_name);
1368
1369 /* v2 supports these by default */
1370 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1371 use_sideband = 2;
1372 if (args->depth > 0 || args->deepen_since || args->deepen_not)
1373 args->deepen = 1;
1374
1375 /* Filter 'ref' by 'sought' and those that aren't local */
1376 if (!args->no_dependents) {
1377 mark_complete_and_common_ref(&negotiator, args, &ref);
1378 filter_refs(args, &ref, sought, nr_sought);
1379 if (everything_local(args, &ref))
1380 state = FETCH_DONE;
1381 else
1382 state = FETCH_SEND_REQUEST;
1383
1384 mark_tips(&negotiator, args->negotiation_tips);
1385 for_each_cached_alternate(&negotiator,
1386 insert_one_alternate_object);
1387 } else {
1388 filter_refs(args, &ref, sought, nr_sought);
1389 state = FETCH_SEND_REQUEST;
1390 }
1391 break;
1392 case FETCH_SEND_REQUEST:
1393 if (send_fetch_request(&negotiator, fd[1], args, ref,
1394 &common,
1395 &haves_to_send, &in_vain))
1396 state = FETCH_GET_PACK;
1397 else
1398 state = FETCH_PROCESS_ACKS;
1399 break;
1400 case FETCH_PROCESS_ACKS:
1401 /* Process ACKs/NAKs */
1402 switch (process_acks(&negotiator, &reader, &common)) {
1403 case 2:
1404 state = FETCH_GET_PACK;
1405 break;
1406 case 1:
1407 in_vain = 0;
1408 /* fallthrough */
1409 default:
1410 state = FETCH_SEND_REQUEST;
1411 break;
1412 }
1413 break;
1414 case FETCH_GET_PACK:
1415 /* Check for shallow-info section */
1416 if (process_section_header(&reader, "shallow-info", 1))
1417 receive_shallow_info(args, &reader);
1418
1419 if (process_section_header(&reader, "wanted-refs", 1))
1420 receive_wanted_refs(&reader, sought, nr_sought);
1421
1422 /* get the pack */
1423 process_section_header(&reader, "packfile", 0);
1424 if (get_pack(args, fd, pack_lockfile))
1425 die(_("git fetch-pack: fetch failed."));
1426
1427 state = FETCH_DONE;
1428 break;
1429 case FETCH_DONE:
1430 continue;
1431 }
1432 }
1433
1434 negotiator.release(&negotiator);
1435 oidset_clear(&common);
1436 return ref;
1437 }
1438
1439 static int fetch_pack_config_cb(const char *var, const char *value, void *cb)
1440 {
1441 if (strcmp(var, "fetch.fsck.skiplist") == 0) {
1442 const char *path;
1443
1444 if (git_config_pathname(&path, var, value))
1445 return 1;
1446 strbuf_addf(&fsck_msg_types, "%cskiplist=%s",
1447 fsck_msg_types.len ? ',' : '=', path);
1448 free((char *)path);
1449 return 0;
1450 }
1451
1452 if (skip_prefix(var, "fetch.fsck.", &var)) {
1453 if (is_valid_msg_type(var, value))
1454 strbuf_addf(&fsck_msg_types, "%c%s=%s",
1455 fsck_msg_types.len ? ',' : '=', var, value);
1456 else
1457 warning("Skipping unknown msg id '%s'", var);
1458 return 0;
1459 }
1460
1461 return git_default_config(var, value, cb);
1462 }
1463
1464 static void fetch_pack_config(void)
1465 {
1466 git_config_get_int("fetch.unpacklimit", &fetch_unpack_limit);
1467 git_config_get_int("transfer.unpacklimit", &transfer_unpack_limit);
1468 git_config_get_bool("repack.usedeltabaseoffset", &prefer_ofs_delta);
1469 git_config_get_bool("fetch.fsckobjects", &fetch_fsck_objects);
1470 git_config_get_bool("transfer.fsckobjects", &transfer_fsck_objects);
1471 git_config_get_string("fetch.negotiationalgorithm",
1472 &negotiation_algorithm);
1473
1474 git_config(fetch_pack_config_cb, NULL);
1475 }
1476
1477 static void fetch_pack_setup(void)
1478 {
1479 static int did_setup;
1480 if (did_setup)
1481 return;
1482 fetch_pack_config();
1483 if (0 <= transfer_unpack_limit)
1484 unpack_limit = transfer_unpack_limit;
1485 else if (0 <= fetch_unpack_limit)
1486 unpack_limit = fetch_unpack_limit;
1487 did_setup = 1;
1488 }
1489
1490 static int remove_duplicates_in_refs(struct ref **ref, int nr)
1491 {
1492 struct string_list names = STRING_LIST_INIT_NODUP;
1493 int src, dst;
1494
1495 for (src = dst = 0; src < nr; src++) {
1496 struct string_list_item *item;
1497 item = string_list_insert(&names, ref[src]->name);
1498 if (item->util)
1499 continue; /* already have it */
1500 item->util = ref[src];
1501 if (src != dst)
1502 ref[dst] = ref[src];
1503 dst++;
1504 }
1505 for (src = dst; src < nr; src++)
1506 ref[src] = NULL;
1507 string_list_clear(&names, 0);
1508 return dst;
1509 }
1510
1511 static void update_shallow(struct fetch_pack_args *args,
1512 struct ref **sought, int nr_sought,
1513 struct shallow_info *si)
1514 {
1515 struct oid_array ref = OID_ARRAY_INIT;
1516 int *status;
1517 int i;
1518
1519 if (args->deepen && alternate_shallow_file) {
1520 if (*alternate_shallow_file == '\0') { /* --unshallow */
1521 unlink_or_warn(git_path_shallow(the_repository));
1522 rollback_lock_file(&shallow_lock);
1523 } else
1524 commit_lock_file(&shallow_lock);
1525 return;
1526 }
1527
1528 if (!si->shallow || !si->shallow->nr)
1529 return;
1530
1531 if (args->cloning) {
1532 /*
1533 * remote is shallow, but this is a clone, there are
1534 * no objects in repo to worry about. Accept any
1535 * shallow points that exist in the pack (iow in repo
1536 * after get_pack() and reprepare_packed_git())
1537 */
1538 struct oid_array extra = OID_ARRAY_INIT;
1539 struct object_id *oid = si->shallow->oid;
1540 for (i = 0; i < si->shallow->nr; i++)
1541 if (has_object_file(&oid[i]))
1542 oid_array_append(&extra, &oid[i]);
1543 if (extra.nr) {
1544 setup_alternate_shallow(&shallow_lock,
1545 &alternate_shallow_file,
1546 &extra);
1547 commit_lock_file(&shallow_lock);
1548 }
1549 oid_array_clear(&extra);
1550 return;
1551 }
1552
1553 if (!si->nr_ours && !si->nr_theirs)
1554 return;
1555
1556 remove_nonexistent_theirs_shallow(si);
1557 if (!si->nr_ours && !si->nr_theirs)
1558 return;
1559 for (i = 0; i < nr_sought; i++)
1560 oid_array_append(&ref, &sought[i]->old_oid);
1561 si->ref = &ref;
1562
1563 if (args->update_shallow) {
1564 /*
1565 * remote is also shallow, .git/shallow may be updated
1566 * so all refs can be accepted. Make sure we only add
1567 * shallow roots that are actually reachable from new
1568 * refs.
1569 */
1570 struct oid_array extra = OID_ARRAY_INIT;
1571 struct object_id *oid = si->shallow->oid;
1572 assign_shallow_commits_to_refs(si, NULL, NULL);
1573 if (!si->nr_ours && !si->nr_theirs) {
1574 oid_array_clear(&ref);
1575 return;
1576 }
1577 for (i = 0; i < si->nr_ours; i++)
1578 oid_array_append(&extra, &oid[si->ours[i]]);
1579 for (i = 0; i < si->nr_theirs; i++)
1580 oid_array_append(&extra, &oid[si->theirs[i]]);
1581 setup_alternate_shallow(&shallow_lock,
1582 &alternate_shallow_file,
1583 &extra);
1584 commit_lock_file(&shallow_lock);
1585 oid_array_clear(&extra);
1586 oid_array_clear(&ref);
1587 return;
1588 }
1589
1590 /*
1591 * remote is also shallow, check what ref is safe to update
1592 * without updating .git/shallow
1593 */
1594 status = xcalloc(nr_sought, sizeof(*status));
1595 assign_shallow_commits_to_refs(si, NULL, status);
1596 if (si->nr_ours || si->nr_theirs) {
1597 for (i = 0; i < nr_sought; i++)
1598 if (status[i])
1599 sought[i]->status = REF_STATUS_REJECT_SHALLOW;
1600 }
1601 free(status);
1602 oid_array_clear(&ref);
1603 }
1604
1605 static int iterate_ref_map(void *cb_data, struct object_id *oid)
1606 {
1607 struct ref **rm = cb_data;
1608 struct ref *ref = *rm;
1609
1610 if (!ref)
1611 return -1; /* end of the list */
1612 *rm = ref->next;
1613 oidcpy(oid, &ref->old_oid);
1614 return 0;
1615 }
1616
1617 struct ref *fetch_pack(struct fetch_pack_args *args,
1618 int fd[], struct child_process *conn,
1619 const struct ref *ref,
1620 const char *dest,
1621 struct ref **sought, int nr_sought,
1622 struct oid_array *shallow,
1623 char **pack_lockfile,
1624 enum protocol_version version)
1625 {
1626 struct ref *ref_cpy;
1627 struct shallow_info si;
1628
1629 fetch_pack_setup();
1630 if (nr_sought)
1631 nr_sought = remove_duplicates_in_refs(sought, nr_sought);
1632
1633 if (args->no_dependents && !args->filter_options.choice) {
1634 /*
1635 * The protocol does not support requesting that only the
1636 * wanted objects be sent, so approximate this by setting a
1637 * "blob:none" filter if no filter is already set. This works
1638 * for all object types: note that wanted blobs will still be
1639 * sent because they are directly specified as a "want".
1640 *
1641 * NEEDSWORK: Add an option in the protocol to request that
1642 * only the wanted objects be sent, and implement it.
1643 */
1644 parse_list_objects_filter(&args->filter_options, "blob:none");
1645 }
1646
1647 if (version != protocol_v2 && !ref) {
1648 packet_flush(fd[1]);
1649 die(_("no matching remote head"));
1650 }
1651 prepare_shallow_info(&si, shallow);
1652 if (version == protocol_v2)
1653 ref_cpy = do_fetch_pack_v2(args, fd, ref, sought, nr_sought,
1654 pack_lockfile);
1655 else
1656 ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought,
1657 &si, pack_lockfile);
1658 reprepare_packed_git(the_repository);
1659
1660 if (!args->cloning && args->deepen) {
1661 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1662 struct ref *iterator = ref_cpy;
1663 opt.shallow_file = alternate_shallow_file;
1664 if (args->deepen)
1665 opt.is_deepening_fetch = 1;
1666 if (check_connected(iterate_ref_map, &iterator, &opt)) {
1667 error(_("remote did not send all necessary objects"));
1668 free_refs(ref_cpy);
1669 ref_cpy = NULL;
1670 rollback_lock_file(&shallow_lock);
1671 goto cleanup;
1672 }
1673 args->connectivity_checked = 1;
1674 }
1675
1676 update_shallow(args, sought, nr_sought, &si);
1677 cleanup:
1678 clear_shallow_info(&si);
1679 return ref_cpy;
1680 }
1681
1682 int report_unmatched_refs(struct ref **sought, int nr_sought)
1683 {
1684 int i, ret = 0;
1685
1686 for (i = 0; i < nr_sought; i++) {
1687 if (!sought[i])
1688 continue;
1689 switch (sought[i]->match_status) {
1690 case REF_MATCHED:
1691 continue;
1692 case REF_NOT_MATCHED:
1693 error(_("no such remote ref %s"), sought[i]->name);
1694 break;
1695 case REF_UNADVERTISED_NOT_ALLOWED:
1696 error(_("Server does not allow request for unadvertised object %s"),
1697 sought[i]->name);
1698 break;
1699 }
1700 ret = 1;
1701 }
1702 return ret;
1703 }
Unnamed repository; edit this file 'description' to name the repository.