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Merge branch 'jt/non-blob-lazy-fetch'
[git.git] / fetch-pack.c
blob49ab2666b9bdc889b6ddb17b43893b5c4fc6a308
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 char *refname,
80 const struct object_id *oid,
81 void *vcache)
82 {
83 struct alternate_object_cache *cache = vcache;
84 struct object *obj = parse_object(the_repository, oid);
85
86 if (!obj || (obj->flags & ALTERNATE))
87 return;
88
89 obj->flags |= ALTERNATE;
90 ALLOC_GROW(cache->items, cache->nr + 1, cache->alloc);
91 cache->items[cache->nr++] = obj;
92 }
93
94 static void for_each_cached_alternate(struct fetch_negotiator *negotiator,
95 void (*cb)(struct fetch_negotiator *,
96 struct object *))
97 {
98 static int initialized;
99 static struct alternate_object_cache cache;
100 size_t i;
101
102 if (!initialized) {
103 for_each_alternate_ref(cache_one_alternate, &cache);
104 initialized = 1;
105 }
106
107 for (i = 0; i < cache.nr; i++)
108 cb(negotiator, cache.items[i]);
109 }
110
111 static int rev_list_insert_ref(struct fetch_negotiator *negotiator,
112 const char *refname,
113 const struct object_id *oid)
114 {
115 struct object *o = deref_tag(the_repository,
116 parse_object(the_repository, oid),
117 refname, 0);
118
119 if (o && o->type == OBJ_COMMIT)
120 negotiator->add_tip(negotiator, (struct commit *)o);
121
122 return 0;
123 }
124
125 static int rev_list_insert_ref_oid(const char *refname, const struct object_id *oid,
126 int flag, void *cb_data)
127 {
128 return rev_list_insert_ref(cb_data, refname, oid);
129 }
130
131 enum ack_type {
132 NAK = 0,
133 ACK,
134 ACK_continue,
135 ACK_common,
136 ACK_ready
137 };
138
139 static void consume_shallow_list(struct fetch_pack_args *args, int fd)
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 char *line;
147 while ((line = packet_read_line(fd, NULL))) {
148 if (starts_with(line, "shallow "))
149 continue;
150 if (starts_with(line, "unshallow "))
151 continue;
152 die(_("git fetch-pack: expected shallow list"));
153 }
154 }
155 }
156
157 static enum ack_type get_ack(int fd, struct object_id *result_oid)
158 {
159 int len;
160 char *line = packet_read_line(fd, &len);
161 const char *arg;
162
163 if (!line)
164 die(_("git fetch-pack: expected ACK/NAK, got a flush packet"));
165 if (!strcmp(line, "NAK"))
166 return NAK;
167 if (skip_prefix(line, "ACK ", &arg)) {
168 if (!get_oid_hex(arg, result_oid)) {
169 arg += 40;
170 len -= arg - line;
171 if (len < 1)
172 return ACK;
173 if (strstr(arg, "continue"))
174 return ACK_continue;
175 if (strstr(arg, "common"))
176 return ACK_common;
177 if (strstr(arg, "ready"))
178 return ACK_ready;
179 return ACK;
180 }
181 }
182 if (skip_prefix(line, "ERR ", &arg))
183 die(_("remote error: %s"), arg);
184 die(_("git fetch-pack: expected ACK/NAK, got '%s'"), line);
185 }
186
187 static void send_request(struct fetch_pack_args *args,
188 int fd, struct strbuf *buf)
189 {
190 if (args->stateless_rpc) {
191 send_sideband(fd, -1, buf->buf, buf->len, LARGE_PACKET_MAX);
192 packet_flush(fd);
193 } else
194 write_or_die(fd, buf->buf, buf->len);
195 }
196
197 static void insert_one_alternate_object(struct fetch_negotiator *negotiator,
198 struct object *obj)
199 {
200 rev_list_insert_ref(negotiator, NULL, &obj->oid);
201 }
202
203 #define INITIAL_FLUSH 16
204 #define PIPESAFE_FLUSH 32
205 #define LARGE_FLUSH 16384
206
207 static int next_flush(int stateless_rpc, int count)
208 {
209 if (stateless_rpc) {
210 if (count < LARGE_FLUSH)
211 count <<= 1;
212 else
213 count = count * 11 / 10;
214 } else {
215 if (count < PIPESAFE_FLUSH)
216 count <<= 1;
217 else
218 count += PIPESAFE_FLUSH;
219 }
220 return count;
221 }
222
223 static void mark_tips(struct fetch_negotiator *negotiator,
224 const struct oid_array *negotiation_tips)
225 {
226 int i;
227
228 if (!negotiation_tips) {
229 for_each_ref(rev_list_insert_ref_oid, negotiator);
230 return;
231 }
232
233 for (i = 0; i < negotiation_tips->nr; i++)
234 rev_list_insert_ref(negotiator, NULL,
235 &negotiation_tips->oid[i]);
236 return;
237 }
238
239 static int find_common(struct fetch_negotiator *negotiator,
240 struct fetch_pack_args *args,
241 int fd[2], struct object_id *result_oid,
242 struct ref *refs)
243 {
244 int fetching;
245 int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval;
246 const struct object_id *oid;
247 unsigned in_vain = 0;
248 int got_continue = 0;
249 int got_ready = 0;
250 struct strbuf req_buf = STRBUF_INIT;
251 size_t state_len = 0;
252
253 if (args->stateless_rpc && multi_ack == 1)
254 die(_("--stateless-rpc requires multi_ack_detailed"));
255
256 if (!args->no_dependents) {
257 mark_tips(negotiator, args->negotiation_tips);
258 for_each_cached_alternate(negotiator, insert_one_alternate_object);
259 }
260
261 fetching = 0;
262 for ( ; refs ; refs = refs->next) {
263 struct object_id *remote = &refs->old_oid;
264 const char *remote_hex;
265 struct object *o;
266
267 /*
268 * If that object is complete (i.e. it is an ancestor of a
269 * local ref), we tell them we have it but do not have to
270 * tell them about its ancestors, which they already know
271 * about.
272 *
273 * We use lookup_object here because we are only
274 * interested in the case we *know* the object is
275 * reachable and we have already scanned it.
276 *
277 * Do this only if args->no_dependents is false (if it is true,
278 * we cannot trust the object flags).
279 */
280 if (!args->no_dependents &&
281 ((o = lookup_object(the_repository, remote->hash)) != NULL) &&
282 (o->flags & COMPLETE)) {
283 continue;
284 }
285
286 remote_hex = oid_to_hex(remote);
287 if (!fetching) {
288 struct strbuf c = STRBUF_INIT;
289 if (multi_ack == 2) strbuf_addstr(&c, " multi_ack_detailed");
290 if (multi_ack == 1) strbuf_addstr(&c, " multi_ack");
291 if (no_done) strbuf_addstr(&c, " no-done");
292 if (use_sideband == 2) strbuf_addstr(&c, " side-band-64k");
293 if (use_sideband == 1) strbuf_addstr(&c, " side-band");
294 if (args->deepen_relative) strbuf_addstr(&c, " deepen-relative");
295 if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack");
296 if (args->no_progress) strbuf_addstr(&c, " no-progress");
297 if (args->include_tag) strbuf_addstr(&c, " include-tag");
298 if (prefer_ofs_delta) strbuf_addstr(&c, " ofs-delta");
299 if (deepen_since_ok) strbuf_addstr(&c, " deepen-since");
300 if (deepen_not_ok) strbuf_addstr(&c, " deepen-not");
301 if (agent_supported) strbuf_addf(&c, " agent=%s",
302 git_user_agent_sanitized());
303 if (args->filter_options.choice)
304 strbuf_addstr(&c, " filter");
305 packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
306 strbuf_release(&c);
307 } else
308 packet_buf_write(&req_buf, "want %s\n", remote_hex);
309 fetching++;
310 }
311
312 if (!fetching) {
313 strbuf_release(&req_buf);
314 packet_flush(fd[1]);
315 return 1;
316 }
317
318 if (is_repository_shallow(the_repository))
319 write_shallow_commits(&req_buf, 1, NULL);
320 if (args->depth > 0)
321 packet_buf_write(&req_buf, "deepen %d", args->depth);
322 if (args->deepen_since) {
323 timestamp_t max_age = approxidate(args->deepen_since);
324 packet_buf_write(&req_buf, "deepen-since %"PRItime, max_age);
325 }
326 if (args->deepen_not) {
327 int i;
328 for (i = 0; i < args->deepen_not->nr; i++) {
329 struct string_list_item *s = args->deepen_not->items + i;
330 packet_buf_write(&req_buf, "deepen-not %s", s->string);
331 }
332 }
333 if (server_supports_filtering && args->filter_options.choice)
334 packet_buf_write(&req_buf, "filter %s",
335 args->filter_options.filter_spec);
336 packet_buf_flush(&req_buf);
337 state_len = req_buf.len;
338
339 if (args->deepen) {
340 char *line;
341 const char *arg;
342 struct object_id oid;
343
344 send_request(args, fd[1], &req_buf);
345 while ((line = packet_read_line(fd[0], NULL))) {
346 if (skip_prefix(line, "shallow ", &arg)) {
347 if (get_oid_hex(arg, &oid))
348 die(_("invalid shallow line: %s"), line);
349 register_shallow(the_repository, &oid);
350 continue;
351 }
352 if (skip_prefix(line, "unshallow ", &arg)) {
353 if (get_oid_hex(arg, &oid))
354 die(_("invalid unshallow line: %s"), line);
355 if (!lookup_object(the_repository, oid.hash))
356 die(_("object not found: %s"), line);
357 /* make sure that it is parsed as shallow */
358 if (!parse_object(the_repository, &oid))
359 die(_("error in object: %s"), line);
360 if (unregister_shallow(&oid))
361 die(_("no shallow found: %s"), line);
362 continue;
363 }
364 die(_("expected shallow/unshallow, got %s"), line);
365 }
366 } else if (!args->stateless_rpc)
367 send_request(args, fd[1], &req_buf);
368
369 if (!args->stateless_rpc) {
370 /* If we aren't using the stateless-rpc interface
371 * we don't need to retain the headers.
372 */
373 strbuf_setlen(&req_buf, 0);
374 state_len = 0;
375 }
376
377 flushes = 0;
378 retval = -1;
379 if (args->no_dependents)
380 goto done;
381 while ((oid = negotiator->next(negotiator))) {
382 packet_buf_write(&req_buf, "have %s\n", oid_to_hex(oid));
383 print_verbose(args, "have %s", oid_to_hex(oid));
384 in_vain++;
385 if (flush_at <= ++count) {
386 int ack;
387
388 packet_buf_flush(&req_buf);
389 send_request(args, fd[1], &req_buf);
390 strbuf_setlen(&req_buf, state_len);
391 flushes++;
392 flush_at = next_flush(args->stateless_rpc, count);
393
394 /*
395 * We keep one window "ahead" of the other side, and
396 * will wait for an ACK only on the next one
397 */
398 if (!args->stateless_rpc && count == INITIAL_FLUSH)
399 continue;
400
401 consume_shallow_list(args, fd[0]);
402 do {
403 ack = get_ack(fd[0], result_oid);
404 if (ack)
405 print_verbose(args, _("got %s %d %s"), "ack",
406 ack, oid_to_hex(result_oid));
407 switch (ack) {
408 case ACK:
409 flushes = 0;
410 multi_ack = 0;
411 retval = 0;
412 goto done;
413 case ACK_common:
414 case ACK_ready:
415 case ACK_continue: {
416 struct commit *commit =
417 lookup_commit(the_repository,
418 result_oid);
419 int was_common;
420
421 if (!commit)
422 die(_("invalid commit %s"), oid_to_hex(result_oid));
423 was_common = negotiator->ack(negotiator, commit);
424 if (args->stateless_rpc
425 && ack == ACK_common
426 && !was_common) {
427 /* We need to replay the have for this object
428 * on the next RPC request so the peer knows
429 * it is in common with us.
430 */
431 const char *hex = oid_to_hex(result_oid);
432 packet_buf_write(&req_buf, "have %s\n", hex);
433 state_len = req_buf.len;
434 /*
435 * Reset in_vain because an ack
436 * for this commit has not been
437 * seen.
438 */
439 in_vain = 0;
440 } else if (!args->stateless_rpc
441 || ack != ACK_common)
442 in_vain = 0;
443 retval = 0;
444 got_continue = 1;
445 if (ack == ACK_ready)
446 got_ready = 1;
447 break;
448 }
449 }
450 } while (ack);
451 flushes--;
452 if (got_continue && MAX_IN_VAIN < in_vain) {
453 print_verbose(args, _("giving up"));
454 break; /* give up */
455 }
456 if (got_ready)
457 break;
458 }
459 }
460 done:
461 if (!got_ready || !no_done) {
462 packet_buf_write(&req_buf, "done\n");
463 send_request(args, fd[1], &req_buf);
464 }
465 print_verbose(args, _("done"));
466 if (retval != 0) {
467 multi_ack = 0;
468 flushes++;
469 }
470 strbuf_release(&req_buf);
471
472 if (!got_ready || !no_done)
473 consume_shallow_list(args, fd[0]);
474 while (flushes || multi_ack) {
475 int ack = get_ack(fd[0], result_oid);
476 if (ack) {
477 print_verbose(args, _("got %s (%d) %s"), "ack",
478 ack, oid_to_hex(result_oid));
479 if (ack == ACK)
480 return 0;
481 multi_ack = 1;
482 continue;
483 }
484 flushes--;
485 }
486 /* it is no error to fetch into a completely empty repo */
487 return count ? retval : 0;
488 }
489
490 static struct commit_list *complete;
491
492 static int mark_complete(const struct object_id *oid)
493 {
494 struct object *o = parse_object(the_repository, oid);
495
496 while (o && o->type == OBJ_TAG) {
497 struct tag *t = (struct tag *) o;
498 if (!t->tagged)
499 break; /* broken repository */
500 o->flags |= COMPLETE;
501 o = parse_object(the_repository, &t->tagged->oid);
502 }
503 if (o && o->type == OBJ_COMMIT) {
504 struct commit *commit = (struct commit *)o;
505 if (!(commit->object.flags & COMPLETE)) {
506 commit->object.flags |= COMPLETE;
507 commit_list_insert(commit, &complete);
508 }
509 }
510 return 0;
511 }
512
513 static int mark_complete_oid(const char *refname, const struct object_id *oid,
514 int flag, void *cb_data)
515 {
516 return mark_complete(oid);
517 }
518
519 static void mark_recent_complete_commits(struct fetch_pack_args *args,
520 timestamp_t cutoff)
521 {
522 while (complete && cutoff <= complete->item->date) {
523 print_verbose(args, _("Marking %s as complete"),
524 oid_to_hex(&complete->item->object.oid));
525 pop_most_recent_commit(&complete, COMPLETE);
526 }
527 }
528
529 static void add_refs_to_oidset(struct oidset *oids, struct ref *refs)
530 {
531 for (; refs; refs = refs->next)
532 oidset_insert(oids, &refs->old_oid);
533 }
534
535 static int is_unmatched_ref(const struct ref *ref)
536 {
537 struct object_id oid;
538 const char *p;
539 return ref->match_status == REF_NOT_MATCHED &&
540 !parse_oid_hex(ref->name, &oid, &p) &&
541 *p == '\0' &&
542 oideq(&oid, &ref->old_oid);
543 }
544
545 static void filter_refs(struct fetch_pack_args *args,
546 struct ref **refs,
547 struct ref **sought, int nr_sought)
548 {
549 struct ref *newlist = NULL;
550 struct ref **newtail = &newlist;
551 struct ref *unmatched = NULL;
552 struct ref *ref, *next;
553 struct oidset tip_oids = OIDSET_INIT;
554 int i;
555 int strict = !(allow_unadvertised_object_request &
556 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
557
558 i = 0;
559 for (ref = *refs; ref; ref = next) {
560 int keep = 0;
561 next = ref->next;
562
563 if (starts_with(ref->name, "refs/") &&
564 check_refname_format(ref->name, 0))
565 ; /* trash */
566 else {
567 while (i < nr_sought) {
568 int cmp = strcmp(ref->name, sought[i]->name);
569 if (cmp < 0)
570 break; /* definitely do not have it */
571 else if (cmp == 0) {
572 keep = 1; /* definitely have it */
573 sought[i]->match_status = REF_MATCHED;
574 }
575 i++;
576 }
577
578 if (!keep && args->fetch_all &&
579 (!args->deepen || !starts_with(ref->name, "refs/tags/")))
580 keep = 1;
581 }
582
583 if (keep) {
584 *newtail = ref;
585 ref->next = NULL;
586 newtail = &ref->next;
587 } else {
588 ref->next = unmatched;
589 unmatched = ref;
590 }
591 }
592
593 if (strict) {
594 for (i = 0; i < nr_sought; i++) {
595 ref = sought[i];
596 if (!is_unmatched_ref(ref))
597 continue;
598
599 add_refs_to_oidset(&tip_oids, unmatched);
600 add_refs_to_oidset(&tip_oids, newlist);
601 break;
602 }
603 }
604
605 /* Append unmatched requests to the list */
606 for (i = 0; i < nr_sought; i++) {
607 ref = sought[i];
608 if (!is_unmatched_ref(ref))
609 continue;
610
611 if (!strict || oidset_contains(&tip_oids, &ref->old_oid)) {
612 ref->match_status = REF_MATCHED;
613 *newtail = copy_ref(ref);
614 newtail = &(*newtail)->next;
615 } else {
616 ref->match_status = REF_UNADVERTISED_NOT_ALLOWED;
617 }
618 }
619
620 oidset_clear(&tip_oids);
621 for (ref = unmatched; ref; ref = next) {
622 next = ref->next;
623 free(ref);
624 }
625
626 *refs = newlist;
627 }
628
629 static void mark_alternate_complete(struct fetch_negotiator *unused,
630 struct object *obj)
631 {
632 mark_complete(&obj->oid);
633 }
634
635 struct loose_object_iter {
636 struct oidset *loose_object_set;
637 struct ref *refs;
638 };
639
640 /*
641 * If the number of refs is not larger than the number of loose objects,
642 * this function stops inserting.
643 */
644 static int add_loose_objects_to_set(const struct object_id *oid,
645 const char *path,
646 void *data)
647 {
648 struct loose_object_iter *iter = data;
649 oidset_insert(iter->loose_object_set, oid);
650 if (iter->refs == NULL)
651 return 1;
652
653 iter->refs = iter->refs->next;
654 return 0;
655 }
656
657 /*
658 * Mark recent commits available locally and reachable from a local ref as
659 * COMPLETE. If args->no_dependents is false, also mark COMPLETE remote refs as
660 * COMMON_REF (otherwise, we are not planning to participate in negotiation, and
661 * thus do not need COMMON_REF marks).
662 *
663 * The cutoff time for recency is determined by this heuristic: it is the
664 * earliest commit time of the objects in refs that are commits and that we know
665 * the commit time of.
666 */
667 static void mark_complete_and_common_ref(struct fetch_negotiator *negotiator,
668 struct fetch_pack_args *args,
669 struct ref **refs)
670 {
671 struct ref *ref;
672 int old_save_commit_buffer = save_commit_buffer;
673 timestamp_t cutoff = 0;
674 struct oidset loose_oid_set = OIDSET_INIT;
675 int use_oidset = 0;
676 struct loose_object_iter iter = {&loose_oid_set, *refs};
677
678 /* Enumerate all loose objects or know refs are not so many. */
679 use_oidset = !for_each_loose_object(add_loose_objects_to_set,
680 &iter, 0);
681
682 save_commit_buffer = 0;
683
684 for (ref = *refs; ref; ref = ref->next) {
685 struct object *o;
686 unsigned int flags = OBJECT_INFO_QUICK;
687
688 if (use_oidset &&
689 !oidset_contains(&loose_oid_set, &ref->old_oid)) {
690 /*
691 * I know this does not exist in the loose form,
692 * so check if it exists in a non-loose form.
693 */
694 flags |= OBJECT_INFO_IGNORE_LOOSE;
695 }
696
697 if (!has_object_file_with_flags(&ref->old_oid, flags))
698 continue;
699 o = parse_object(the_repository, &ref->old_oid);
700 if (!o)
701 continue;
702
703 /* We already have it -- which may mean that we were
704 * in sync with the other side at some time after
705 * that (it is OK if we guess wrong here).
706 */
707 if (o->type == OBJ_COMMIT) {
708 struct commit *commit = (struct commit *)o;
709 if (!cutoff || cutoff < commit->date)
710 cutoff = commit->date;
711 }
712 }
713
714 oidset_clear(&loose_oid_set);
715
716 if (!args->deepen) {
717 for_each_ref(mark_complete_oid, NULL);
718 for_each_cached_alternate(NULL, mark_alternate_complete);
719 commit_list_sort_by_date(&complete);
720 if (cutoff)
721 mark_recent_complete_commits(args, cutoff);
722 }
723
724 /*
725 * Mark all complete remote refs as common refs.
726 * Don't mark them common yet; the server has to be told so first.
727 */
728 for (ref = *refs; ref; ref = ref->next) {
729 struct object *o = deref_tag(the_repository,
730 lookup_object(the_repository,
731 ref->old_oid.hash),
732 NULL, 0);
733
734 if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE))
735 continue;
736
737 negotiator->known_common(negotiator,
738 (struct commit *)o);
739 }
740
741 save_commit_buffer = old_save_commit_buffer;
742 }
743
744 /*
745 * Returns 1 if every object pointed to by the given remote refs is available
746 * locally and reachable from a local ref, and 0 otherwise.
747 */
748 static int everything_local(struct fetch_pack_args *args,
749 struct ref **refs)
750 {
751 struct ref *ref;
752 int retval;
753
754 for (retval = 1, ref = *refs; ref ; ref = ref->next) {
755 const struct object_id *remote = &ref->old_oid;
756 struct object *o;
757
758 o = lookup_object(the_repository, remote->hash);
759 if (!o || !(o->flags & COMPLETE)) {
760 retval = 0;
761 print_verbose(args, "want %s (%s)", oid_to_hex(remote),
762 ref->name);
763 continue;
764 }
765 print_verbose(args, _("already have %s (%s)"), oid_to_hex(remote),
766 ref->name);
767 }
768
769 return retval;
770 }
771
772 static int sideband_demux(int in, int out, void *data)
773 {
774 int *xd = data;
775 int ret;
776
777 ret = recv_sideband("fetch-pack", xd[0], out);
778 close(out);
779 return ret;
780 }
781
782 static int get_pack(struct fetch_pack_args *args,
783 int xd[2], char **pack_lockfile)
784 {
785 struct async demux;
786 int do_keep = args->keep_pack;
787 const char *cmd_name;
788 struct pack_header header;
789 int pass_header = 0;
790 struct child_process cmd = CHILD_PROCESS_INIT;
791 int ret;
792
793 memset(&demux, 0, sizeof(demux));
794 if (use_sideband) {
795 /* xd[] is talking with upload-pack; subprocess reads from
796 * xd[0], spits out band#2 to stderr, and feeds us band#1
797 * through demux->out.
798 */
799 demux.proc = sideband_demux;
800 demux.data = xd;
801 demux.out = -1;
802 demux.isolate_sigpipe = 1;
803 if (start_async(&demux))
804 die(_("fetch-pack: unable to fork off sideband demultiplexer"));
805 }
806 else
807 demux.out = xd[0];
808
809 if (!args->keep_pack && unpack_limit) {
810
811 if (read_pack_header(demux.out, &header))
812 die(_("protocol error: bad pack header"));
813 pass_header = 1;
814 if (ntohl(header.hdr_entries) < unpack_limit)
815 do_keep = 0;
816 else
817 do_keep = 1;
818 }
819
820 if (alternate_shallow_file) {
821 argv_array_push(&cmd.args, "--shallow-file");
822 argv_array_push(&cmd.args, alternate_shallow_file);
823 }
824
825 if (do_keep || args->from_promisor) {
826 if (pack_lockfile)
827 cmd.out = -1;
828 cmd_name = "index-pack";
829 argv_array_push(&cmd.args, cmd_name);
830 argv_array_push(&cmd.args, "--stdin");
831 if (!args->quiet && !args->no_progress)
832 argv_array_push(&cmd.args, "-v");
833 if (args->use_thin_pack)
834 argv_array_push(&cmd.args, "--fix-thin");
835 if (do_keep && (args->lock_pack || unpack_limit)) {
836 char hostname[HOST_NAME_MAX + 1];
837 if (xgethostname(hostname, sizeof(hostname)))
838 xsnprintf(hostname, sizeof(hostname), "localhost");
839 argv_array_pushf(&cmd.args,
840 "--keep=fetch-pack %"PRIuMAX " on %s",
841 (uintmax_t)getpid(), hostname);
842 }
843 if (args->check_self_contained_and_connected)
844 argv_array_push(&cmd.args, "--check-self-contained-and-connected");
845 if (args->from_promisor)
846 argv_array_push(&cmd.args, "--promisor");
847 }
848 else {
849 cmd_name = "unpack-objects";
850 argv_array_push(&cmd.args, cmd_name);
851 if (args->quiet || args->no_progress)
852 argv_array_push(&cmd.args, "-q");
853 args->check_self_contained_and_connected = 0;
854 }
855
856 if (pass_header)
857 argv_array_pushf(&cmd.args, "--pack_header=%"PRIu32",%"PRIu32,
858 ntohl(header.hdr_version),
859 ntohl(header.hdr_entries));
860 if (fetch_fsck_objects >= 0
861 ? fetch_fsck_objects
862 : transfer_fsck_objects >= 0
863 ? transfer_fsck_objects
864 : 0) {
865 if (args->from_promisor)
866 /*
867 * We cannot use --strict in index-pack because it
868 * checks both broken objects and links, but we only
869 * want to check for broken objects.
870 */
871 argv_array_push(&cmd.args, "--fsck-objects");
872 else
873 argv_array_pushf(&cmd.args, "--strict%s",
874 fsck_msg_types.buf);
875 }
876
877 cmd.in = demux.out;
878 cmd.git_cmd = 1;
879 if (start_command(&cmd))
880 die(_("fetch-pack: unable to fork off %s"), cmd_name);
881 if (do_keep && pack_lockfile) {
882 *pack_lockfile = index_pack_lockfile(cmd.out);
883 close(cmd.out);
884 }
885
886 if (!use_sideband)
887 /* Closed by start_command() */
888 xd[0] = -1;
889
890 ret = finish_command(&cmd);
891 if (!ret || (args->check_self_contained_and_connected && ret == 1))
892 args->self_contained_and_connected =
893 args->check_self_contained_and_connected &&
894 ret == 0;
895 else
896 die(_("%s failed"), cmd_name);
897 if (use_sideband && finish_async(&demux))
898 die(_("error in sideband demultiplexer"));
899 return 0;
900 }
901
902 static int cmp_ref_by_name(const void *a_, const void *b_)
903 {
904 const struct ref *a = *((const struct ref **)a_);
905 const struct ref *b = *((const struct ref **)b_);
906 return strcmp(a->name, b->name);
907 }
908
909 static struct ref *do_fetch_pack(struct fetch_pack_args *args,
910 int fd[2],
911 const struct ref *orig_ref,
912 struct ref **sought, int nr_sought,
913 struct shallow_info *si,
914 char **pack_lockfile)
915 {
916 struct ref *ref = copy_ref_list(orig_ref);
917 struct object_id oid;
918 const char *agent_feature;
919 int agent_len;
920 struct fetch_negotiator negotiator;
921 fetch_negotiator_init(&negotiator, negotiation_algorithm);
922
923 sort_ref_list(&ref, ref_compare_name);
924 QSORT(sought, nr_sought, cmp_ref_by_name);
925
926 if ((args->depth > 0 || is_repository_shallow(the_repository)) && !server_supports("shallow"))
927 die(_("Server does not support shallow clients"));
928 if (args->depth > 0 || args->deepen_since || args->deepen_not)
929 args->deepen = 1;
930 if (server_supports("multi_ack_detailed")) {
931 print_verbose(args, _("Server supports multi_ack_detailed"));
932 multi_ack = 2;
933 if (server_supports("no-done")) {
934 print_verbose(args, _("Server supports no-done"));
935 if (args->stateless_rpc)
936 no_done = 1;
937 }
938 }
939 else if (server_supports("multi_ack")) {
940 print_verbose(args, _("Server supports multi_ack"));
941 multi_ack = 1;
942 }
943 if (server_supports("side-band-64k")) {
944 print_verbose(args, _("Server supports side-band-64k"));
945 use_sideband = 2;
946 }
947 else if (server_supports("side-band")) {
948 print_verbose(args, _("Server supports side-band"));
949 use_sideband = 1;
950 }
951 if (server_supports("allow-tip-sha1-in-want")) {
952 print_verbose(args, _("Server supports allow-tip-sha1-in-want"));
953 allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
954 }
955 if (server_supports("allow-reachable-sha1-in-want")) {
956 print_verbose(args, _("Server supports allow-reachable-sha1-in-want"));
957 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
958 }
959 if (!server_supports("thin-pack"))
960 args->use_thin_pack = 0;
961 if (!server_supports("no-progress"))
962 args->no_progress = 0;
963 if (!server_supports("include-tag"))
964 args->include_tag = 0;
965 if (server_supports("ofs-delta"))
966 print_verbose(args, _("Server supports ofs-delta"));
967 else
968 prefer_ofs_delta = 0;
969
970 if (server_supports("filter")) {
971 server_supports_filtering = 1;
972 print_verbose(args, _("Server supports filter"));
973 } else if (args->filter_options.choice) {
974 warning("filtering not recognized by server, ignoring");
975 }
976
977 if ((agent_feature = server_feature_value("agent", &agent_len))) {
978 agent_supported = 1;
979 if (agent_len)
980 print_verbose(args, _("Server version is %.*s"),
981 agent_len, agent_feature);
982 }
983 if (server_supports("deepen-since"))
984 deepen_since_ok = 1;
985 else if (args->deepen_since)
986 die(_("Server does not support --shallow-since"));
987 if (server_supports("deepen-not"))
988 deepen_not_ok = 1;
989 else if (args->deepen_not)
990 die(_("Server does not support --shallow-exclude"));
991 if (!server_supports("deepen-relative") && args->deepen_relative)
992 die(_("Server does not support --deepen"));
993
994 if (!args->no_dependents) {
995 mark_complete_and_common_ref(&negotiator, args, &ref);
996 filter_refs(args, &ref, sought, nr_sought);
997 if (everything_local(args, &ref)) {
998 packet_flush(fd[1]);
999 goto all_done;
1000 }
1001 } else {
1002 filter_refs(args, &ref, sought, nr_sought);
1003 }
1004 if (find_common(&negotiator, args, fd, &oid, ref) < 0)
1005 if (!args->keep_pack)
1006 /* When cloning, it is not unusual to have
1007 * no common commit.
1008 */
1009 warning(_("no common commits"));
1010
1011 if (args->stateless_rpc)
1012 packet_flush(fd[1]);
1013 if (args->deepen)
1014 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
1015 NULL);
1016 else if (si->nr_ours || si->nr_theirs)
1017 alternate_shallow_file = setup_temporary_shallow(si->shallow);
1018 else
1019 alternate_shallow_file = NULL;
1020 if (get_pack(args, fd, pack_lockfile))
1021 die(_("git fetch-pack: fetch failed."));
1022
1023 all_done:
1024 negotiator.release(&negotiator);
1025 return ref;
1026 }
1027
1028 static void add_shallow_requests(struct strbuf *req_buf,
1029 const struct fetch_pack_args *args)
1030 {
1031 if (is_repository_shallow(the_repository))
1032 write_shallow_commits(req_buf, 1, NULL);
1033 if (args->depth > 0)
1034 packet_buf_write(req_buf, "deepen %d", args->depth);
1035 if (args->deepen_since) {
1036 timestamp_t max_age = approxidate(args->deepen_since);
1037 packet_buf_write(req_buf, "deepen-since %"PRItime, max_age);
1038 }
1039 if (args->deepen_not) {
1040 int i;
1041 for (i = 0; i < args->deepen_not->nr; i++) {
1042 struct string_list_item *s = args->deepen_not->items + i;
1043 packet_buf_write(req_buf, "deepen-not %s", s->string);
1044 }
1045 }
1046 }
1047
1048 static void add_wants(int no_dependents, const struct ref *wants, struct strbuf *req_buf)
1049 {
1050 int use_ref_in_want = server_supports_feature("fetch", "ref-in-want", 0);
1051
1052 for ( ; wants ; wants = wants->next) {
1053 const struct object_id *remote = &wants->old_oid;
1054 struct object *o;
1055
1056 /*
1057 * If that object is complete (i.e. it is an ancestor of a
1058 * local ref), we tell them we have it but do not have to
1059 * tell them about its ancestors, which they already know
1060 * about.
1061 *
1062 * We use lookup_object here because we are only
1063 * interested in the case we *know* the object is
1064 * reachable and we have already scanned it.
1065 *
1066 * Do this only if args->no_dependents is false (if it is true,
1067 * we cannot trust the object flags).
1068 */
1069 if (!no_dependents &&
1070 ((o = lookup_object(the_repository, remote->hash)) != NULL) &&
1071 (o->flags & COMPLETE)) {
1072 continue;
1073 }
1074
1075 if (!use_ref_in_want || wants->exact_oid)
1076 packet_buf_write(req_buf, "want %s\n", oid_to_hex(remote));
1077 else
1078 packet_buf_write(req_buf, "want-ref %s\n", wants->name);
1079 }
1080 }
1081
1082 static void add_common(struct strbuf *req_buf, struct oidset *common)
1083 {
1084 struct oidset_iter iter;
1085 const struct object_id *oid;
1086 oidset_iter_init(common, &iter);
1087
1088 while ((oid = oidset_iter_next(&iter))) {
1089 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1090 }
1091 }
1092
1093 static int add_haves(struct fetch_negotiator *negotiator,
1094 struct strbuf *req_buf,
1095 int *haves_to_send, int *in_vain)
1096 {
1097 int ret = 0;
1098 int haves_added = 0;
1099 const struct object_id *oid;
1100
1101 while ((oid = negotiator->next(negotiator))) {
1102 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1103 if (++haves_added >= *haves_to_send)
1104 break;
1105 }
1106
1107 *in_vain += haves_added;
1108 if (!haves_added || *in_vain >= MAX_IN_VAIN) {
1109 /* Send Done */
1110 packet_buf_write(req_buf, "done\n");
1111 ret = 1;
1112 }
1113
1114 /* Increase haves to send on next round */
1115 *haves_to_send = next_flush(1, *haves_to_send);
1116
1117 return ret;
1118 }
1119
1120 static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out,
1121 const struct fetch_pack_args *args,
1122 const struct ref *wants, struct oidset *common,
1123 int *haves_to_send, int *in_vain)
1124 {
1125 int ret = 0;
1126 struct strbuf req_buf = STRBUF_INIT;
1127
1128 if (server_supports_v2("fetch", 1))
1129 packet_buf_write(&req_buf, "command=fetch");
1130 if (server_supports_v2("agent", 0))
1131 packet_buf_write(&req_buf, "agent=%s", git_user_agent_sanitized());
1132 if (args->server_options && args->server_options->nr &&
1133 server_supports_v2("server-option", 1)) {
1134 int i;
1135 for (i = 0; i < args->server_options->nr; i++)
1136 packet_write_fmt(fd_out, "server-option=%s",
1137 args->server_options->items[i].string);
1138 }
1139
1140 packet_buf_delim(&req_buf);
1141 if (args->use_thin_pack)
1142 packet_buf_write(&req_buf, "thin-pack");
1143 if (args->no_progress)
1144 packet_buf_write(&req_buf, "no-progress");
1145 if (args->include_tag)
1146 packet_buf_write(&req_buf, "include-tag");
1147 if (prefer_ofs_delta)
1148 packet_buf_write(&req_buf, "ofs-delta");
1149
1150 /* Add shallow-info and deepen request */
1151 if (server_supports_feature("fetch", "shallow", 0))
1152 add_shallow_requests(&req_buf, args);
1153 else if (is_repository_shallow(the_repository) || args->deepen)
1154 die(_("Server does not support shallow requests"));
1155
1156 /* Add filter */
1157 if (server_supports_feature("fetch", "filter", 0) &&
1158 args->filter_options.choice) {
1159 print_verbose(args, _("Server supports filter"));
1160 packet_buf_write(&req_buf, "filter %s",
1161 args->filter_options.filter_spec);
1162 } else if (args->filter_options.choice) {
1163 warning("filtering not recognized by server, ignoring");
1164 }
1165
1166 /* add wants */
1167 add_wants(args->no_dependents, wants, &req_buf);
1168
1169 if (args->no_dependents) {
1170 packet_buf_write(&req_buf, "done");
1171 ret = 1;
1172 } else {
1173 /* Add all of the common commits we've found in previous rounds */
1174 add_common(&req_buf, common);
1175
1176 /* Add initial haves */
1177 ret = add_haves(negotiator, &req_buf, haves_to_send, in_vain);
1178 }
1179
1180 /* Send request */
1181 packet_buf_flush(&req_buf);
1182 write_or_die(fd_out, req_buf.buf, req_buf.len);
1183
1184 strbuf_release(&req_buf);
1185 return ret;
1186 }
1187
1188 /*
1189 * Processes a section header in a server's response and checks if it matches
1190 * `section`. If the value of `peek` is 1, the header line will be peeked (and
1191 * not consumed); if 0, the line will be consumed and the function will die if
1192 * the section header doesn't match what was expected.
1193 */
1194 static int process_section_header(struct packet_reader *reader,
1195 const char *section, int peek)
1196 {
1197 int ret;
1198
1199 if (packet_reader_peek(reader) != PACKET_READ_NORMAL)
1200 die(_("error reading section header '%s'"), section);
1201
1202 ret = !strcmp(reader->line, section);
1203
1204 if (!peek) {
1205 if (!ret)
1206 die(_("expected '%s', received '%s'"),
1207 section, reader->line);
1208 packet_reader_read(reader);
1209 }
1210
1211 return ret;
1212 }
1213
1214 static int process_acks(struct fetch_negotiator *negotiator,
1215 struct packet_reader *reader,
1216 struct oidset *common)
1217 {
1218 /* received */
1219 int received_ready = 0;
1220 int received_ack = 0;
1221
1222 process_section_header(reader, "acknowledgments", 0);
1223 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1224 const char *arg;
1225
1226 if (!strcmp(reader->line, "NAK"))
1227 continue;
1228
1229 if (skip_prefix(reader->line, "ACK ", &arg)) {
1230 struct object_id oid;
1231 if (!get_oid_hex(arg, &oid)) {
1232 struct commit *commit;
1233 oidset_insert(common, &oid);
1234 commit = lookup_commit(the_repository, &oid);
1235 negotiator->ack(negotiator, commit);
1236 }
1237 continue;
1238 }
1239
1240 if (!strcmp(reader->line, "ready")) {
1241 received_ready = 1;
1242 continue;
1243 }
1244
1245 die(_("unexpected acknowledgment line: '%s'"), reader->line);
1246 }
1247
1248 if (reader->status != PACKET_READ_FLUSH &&
1249 reader->status != PACKET_READ_DELIM)
1250 die(_("error processing acks: %d"), reader->status);
1251
1252 /* return 0 if no common, 1 if there are common, or 2 if ready */
1253 return received_ready ? 2 : (received_ack ? 1 : 0);
1254 }
1255
1256 static void receive_shallow_info(struct fetch_pack_args *args,
1257 struct packet_reader *reader)
1258 {
1259 process_section_header(reader, "shallow-info", 0);
1260 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1261 const char *arg;
1262 struct object_id oid;
1263
1264 if (skip_prefix(reader->line, "shallow ", &arg)) {
1265 if (get_oid_hex(arg, &oid))
1266 die(_("invalid shallow line: %s"), reader->line);
1267 register_shallow(the_repository, &oid);
1268 continue;
1269 }
1270 if (skip_prefix(reader->line, "unshallow ", &arg)) {
1271 if (get_oid_hex(arg, &oid))
1272 die(_("invalid unshallow line: %s"), reader->line);
1273 if (!lookup_object(the_repository, oid.hash))
1274 die(_("object not found: %s"), reader->line);
1275 /* make sure that it is parsed as shallow */
1276 if (!parse_object(the_repository, &oid))
1277 die(_("error in object: %s"), reader->line);
1278 if (unregister_shallow(&oid))
1279 die(_("no shallow found: %s"), reader->line);
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 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file, NULL);
1290 args->deepen = 1;
1291 }
1292
1293 static void receive_wanted_refs(struct packet_reader *reader,
1294 struct ref **sought, int nr_sought)
1295 {
1296 process_section_header(reader, "wanted-refs", 0);
1297 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1298 struct object_id oid;
1299 const char *end;
1300 int i;
1301
1302 if (parse_oid_hex(reader->line, &oid, &end) || *end++ != ' ')
1303 die(_("expected wanted-ref, got '%s'"), reader->line);
1304
1305 for (i = 0; i < nr_sought; i++) {
1306 if (!strcmp(end, sought[i]->name)) {
1307 oidcpy(&sought[i]->old_oid, &oid);
1308 break;
1309 }
1310 }
1311
1312 if (i == nr_sought)
1313 die(_("unexpected wanted-ref: '%s'"), reader->line);
1314 }
1315
1316 if (reader->status != PACKET_READ_DELIM)
1317 die(_("error processing wanted refs: %d"), reader->status);
1318 }
1319
1320 enum fetch_state {
1321 FETCH_CHECK_LOCAL = 0,
1322 FETCH_SEND_REQUEST,
1323 FETCH_PROCESS_ACKS,
1324 FETCH_GET_PACK,
1325 FETCH_DONE,
1326 };
1327
1328 static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
1329 int fd[2],
1330 const struct ref *orig_ref,
1331 struct ref **sought, int nr_sought,
1332 char **pack_lockfile)
1333 {
1334 struct ref *ref = copy_ref_list(orig_ref);
1335 enum fetch_state state = FETCH_CHECK_LOCAL;
1336 struct oidset common = OIDSET_INIT;
1337 struct packet_reader reader;
1338 int in_vain = 0;
1339 int haves_to_send = INITIAL_FLUSH;
1340 struct fetch_negotiator negotiator;
1341 fetch_negotiator_init(&negotiator, negotiation_algorithm);
1342 packet_reader_init(&reader, fd[0], NULL, 0,
1343 PACKET_READ_CHOMP_NEWLINE);
1344
1345 while (state != FETCH_DONE) {
1346 switch (state) {
1347 case FETCH_CHECK_LOCAL:
1348 sort_ref_list(&ref, ref_compare_name);
1349 QSORT(sought, nr_sought, cmp_ref_by_name);
1350
1351 /* v2 supports these by default */
1352 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1353 use_sideband = 2;
1354 if (args->depth > 0 || args->deepen_since || args->deepen_not)
1355 args->deepen = 1;
1356
1357 /* Filter 'ref' by 'sought' and those that aren't local */
1358 if (!args->no_dependents) {
1359 mark_complete_and_common_ref(&negotiator, args, &ref);
1360 filter_refs(args, &ref, sought, nr_sought);
1361 if (everything_local(args, &ref))
1362 state = FETCH_DONE;
1363 else
1364 state = FETCH_SEND_REQUEST;
1365
1366 mark_tips(&negotiator, args->negotiation_tips);
1367 for_each_cached_alternate(&negotiator,
1368 insert_one_alternate_object);
1369 } else {
1370 filter_refs(args, &ref, sought, nr_sought);
1371 state = FETCH_SEND_REQUEST;
1372 }
1373 break;
1374 case FETCH_SEND_REQUEST:
1375 if (send_fetch_request(&negotiator, fd[1], args, ref,
1376 &common,
1377 &haves_to_send, &in_vain))
1378 state = FETCH_GET_PACK;
1379 else
1380 state = FETCH_PROCESS_ACKS;
1381 break;
1382 case FETCH_PROCESS_ACKS:
1383 /* Process ACKs/NAKs */
1384 switch (process_acks(&negotiator, &reader, &common)) {
1385 case 2:
1386 state = FETCH_GET_PACK;
1387 break;
1388 case 1:
1389 in_vain = 0;
1390 /* fallthrough */
1391 default:
1392 state = FETCH_SEND_REQUEST;
1393 break;
1394 }
1395 break;
1396 case FETCH_GET_PACK:
1397 /* Check for shallow-info section */
1398 if (process_section_header(&reader, "shallow-info", 1))
1399 receive_shallow_info(args, &reader);
1400
1401 if (process_section_header(&reader, "wanted-refs", 1))
1402 receive_wanted_refs(&reader, sought, nr_sought);
1403
1404 /* get the pack */
1405 process_section_header(&reader, "packfile", 0);
1406 if (get_pack(args, fd, pack_lockfile))
1407 die(_("git fetch-pack: fetch failed."));
1408
1409 state = FETCH_DONE;
1410 break;
1411 case FETCH_DONE:
1412 continue;
1413 }
1414 }
1415
1416 negotiator.release(&negotiator);
1417 oidset_clear(&common);
1418 return ref;
1419 }
1420
1421 static int fetch_pack_config_cb(const char *var, const char *value, void *cb)
1422 {
1423 if (strcmp(var, "fetch.fsck.skiplist") == 0) {
1424 const char *path;
1425
1426 if (git_config_pathname(&path, var, value))
1427 return 1;
1428 strbuf_addf(&fsck_msg_types, "%cskiplist=%s",
1429 fsck_msg_types.len ? ',' : '=', path);
1430 free((char *)path);
1431 return 0;
1432 }
1433
1434 if (skip_prefix(var, "fetch.fsck.", &var)) {
1435 if (is_valid_msg_type(var, value))
1436 strbuf_addf(&fsck_msg_types, "%c%s=%s",
1437 fsck_msg_types.len ? ',' : '=', var, value);
1438 else
1439 warning("Skipping unknown msg id '%s'", var);
1440 return 0;
1441 }
1442
1443 return git_default_config(var, value, cb);
1444 }
1445
1446 static void fetch_pack_config(void)
1447 {
1448 git_config_get_int("fetch.unpacklimit", &fetch_unpack_limit);
1449 git_config_get_int("transfer.unpacklimit", &transfer_unpack_limit);
1450 git_config_get_bool("repack.usedeltabaseoffset", &prefer_ofs_delta);
1451 git_config_get_bool("fetch.fsckobjects", &fetch_fsck_objects);
1452 git_config_get_bool("transfer.fsckobjects", &transfer_fsck_objects);
1453 git_config_get_string("fetch.negotiationalgorithm",
1454 &negotiation_algorithm);
1455
1456 git_config(fetch_pack_config_cb, NULL);
1457 }
1458
1459 static void fetch_pack_setup(void)
1460 {
1461 static int did_setup;
1462 if (did_setup)
1463 return;
1464 fetch_pack_config();
1465 if (0 <= transfer_unpack_limit)
1466 unpack_limit = transfer_unpack_limit;
1467 else if (0 <= fetch_unpack_limit)
1468 unpack_limit = fetch_unpack_limit;
1469 did_setup = 1;
1470 }
1471
1472 static int remove_duplicates_in_refs(struct ref **ref, int nr)
1473 {
1474 struct string_list names = STRING_LIST_INIT_NODUP;
1475 int src, dst;
1476
1477 for (src = dst = 0; src < nr; src++) {
1478 struct string_list_item *item;
1479 item = string_list_insert(&names, ref[src]->name);
1480 if (item->util)
1481 continue; /* already have it */
1482 item->util = ref[src];
1483 if (src != dst)
1484 ref[dst] = ref[src];
1485 dst++;
1486 }
1487 for (src = dst; src < nr; src++)
1488 ref[src] = NULL;
1489 string_list_clear(&names, 0);
1490 return dst;
1491 }
1492
1493 static void update_shallow(struct fetch_pack_args *args,
1494 struct ref **sought, int nr_sought,
1495 struct shallow_info *si)
1496 {
1497 struct oid_array ref = OID_ARRAY_INIT;
1498 int *status;
1499 int i;
1500
1501 if (args->deepen && alternate_shallow_file) {
1502 if (*alternate_shallow_file == '\0') { /* --unshallow */
1503 unlink_or_warn(git_path_shallow(the_repository));
1504 rollback_lock_file(&shallow_lock);
1505 } else
1506 commit_lock_file(&shallow_lock);
1507 return;
1508 }
1509
1510 if (!si->shallow || !si->shallow->nr)
1511 return;
1512
1513 if (args->cloning) {
1514 /*
1515 * remote is shallow, but this is a clone, there are
1516 * no objects in repo to worry about. Accept any
1517 * shallow points that exist in the pack (iow in repo
1518 * after get_pack() and reprepare_packed_git())
1519 */
1520 struct oid_array extra = OID_ARRAY_INIT;
1521 struct object_id *oid = si->shallow->oid;
1522 for (i = 0; i < si->shallow->nr; i++)
1523 if (has_object_file(&oid[i]))
1524 oid_array_append(&extra, &oid[i]);
1525 if (extra.nr) {
1526 setup_alternate_shallow(&shallow_lock,
1527 &alternate_shallow_file,
1528 &extra);
1529 commit_lock_file(&shallow_lock);
1530 }
1531 oid_array_clear(&extra);
1532 return;
1533 }
1534
1535 if (!si->nr_ours && !si->nr_theirs)
1536 return;
1537
1538 remove_nonexistent_theirs_shallow(si);
1539 if (!si->nr_ours && !si->nr_theirs)
1540 return;
1541 for (i = 0; i < nr_sought; i++)
1542 oid_array_append(&ref, &sought[i]->old_oid);
1543 si->ref = &ref;
1544
1545 if (args->update_shallow) {
1546 /*
1547 * remote is also shallow, .git/shallow may be updated
1548 * so all refs can be accepted. Make sure we only add
1549 * shallow roots that are actually reachable from new
1550 * refs.
1551 */
1552 struct oid_array extra = OID_ARRAY_INIT;
1553 struct object_id *oid = si->shallow->oid;
1554 assign_shallow_commits_to_refs(si, NULL, NULL);
1555 if (!si->nr_ours && !si->nr_theirs) {
1556 oid_array_clear(&ref);
1557 return;
1558 }
1559 for (i = 0; i < si->nr_ours; i++)
1560 oid_array_append(&extra, &oid[si->ours[i]]);
1561 for (i = 0; i < si->nr_theirs; i++)
1562 oid_array_append(&extra, &oid[si->theirs[i]]);
1563 setup_alternate_shallow(&shallow_lock,
1564 &alternate_shallow_file,
1565 &extra);
1566 commit_lock_file(&shallow_lock);
1567 oid_array_clear(&extra);
1568 oid_array_clear(&ref);
1569 return;
1570 }
1571
1572 /*
1573 * remote is also shallow, check what ref is safe to update
1574 * without updating .git/shallow
1575 */
1576 status = xcalloc(nr_sought, sizeof(*status));
1577 assign_shallow_commits_to_refs(si, NULL, status);
1578 if (si->nr_ours || si->nr_theirs) {
1579 for (i = 0; i < nr_sought; i++)
1580 if (status[i])
1581 sought[i]->status = REF_STATUS_REJECT_SHALLOW;
1582 }
1583 free(status);
1584 oid_array_clear(&ref);
1585 }
1586
1587 static int iterate_ref_map(void *cb_data, struct object_id *oid)
1588 {
1589 struct ref **rm = cb_data;
1590 struct ref *ref = *rm;
1591
1592 if (!ref)
1593 return -1; /* end of the list */
1594 *rm = ref->next;
1595 oidcpy(oid, &ref->old_oid);
1596 return 0;
1597 }
1598
1599 struct ref *fetch_pack(struct fetch_pack_args *args,
1600 int fd[], struct child_process *conn,
1601 const struct ref *ref,
1602 const char *dest,
1603 struct ref **sought, int nr_sought,
1604 struct oid_array *shallow,
1605 char **pack_lockfile,
1606 enum protocol_version version)
1607 {
1608 struct ref *ref_cpy;
1609 struct shallow_info si;
1610
1611 fetch_pack_setup();
1612 if (nr_sought)
1613 nr_sought = remove_duplicates_in_refs(sought, nr_sought);
1614
1615 if (args->no_dependents && !args->filter_options.choice) {
1616 /*
1617 * The protocol does not support requesting that only the
1618 * wanted objects be sent, so approximate this by setting a
1619 * "blob:none" filter if no filter is already set. This works
1620 * for all object types: note that wanted blobs will still be
1621 * sent because they are directly specified as a "want".
1622 *
1623 * NEEDSWORK: Add an option in the protocol to request that
1624 * only the wanted objects be sent, and implement it.
1625 */
1626 parse_list_objects_filter(&args->filter_options, "blob:none");
1627 }
1628
1629 if (!ref) {
1630 packet_flush(fd[1]);
1631 die(_("no matching remote head"));
1632 }
1633 prepare_shallow_info(&si, shallow);
1634 if (version == protocol_v2)
1635 ref_cpy = do_fetch_pack_v2(args, fd, ref, sought, nr_sought,
1636 pack_lockfile);
1637 else
1638 ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought,
1639 &si, pack_lockfile);
1640 reprepare_packed_git(the_repository);
1641
1642 if (!args->cloning && args->deepen) {
1643 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1644 struct ref *iterator = ref_cpy;
1645 opt.shallow_file = alternate_shallow_file;
1646 if (args->deepen)
1647 opt.is_deepening_fetch = 1;
1648 if (check_connected(iterate_ref_map, &iterator, &opt)) {
1649 error(_("remote did not send all necessary objects"));
1650 free_refs(ref_cpy);
1651 ref_cpy = NULL;
1652 rollback_lock_file(&shallow_lock);
1653 goto cleanup;
1654 }
1655 args->connectivity_checked = 1;
1656 }
1657
1658 update_shallow(args, sought, nr_sought, &si);
1659 cleanup:
1660 clear_shallow_info(&si);
1661 return ref_cpy;
1662 }
1663
1664 int report_unmatched_refs(struct ref **sought, int nr_sought)
1665 {
1666 int i, ret = 0;
1667
1668 for (i = 0; i < nr_sought; i++) {
1669 if (!sought[i])
1670 continue;
1671 switch (sought[i]->match_status) {
1672 case REF_MATCHED:
1673 continue;
1674 case REF_NOT_MATCHED:
1675 error(_("no such remote ref %s"), sought[i]->name);
1676 break;
1677 case REF_UNADVERTISED_NOT_ALLOWED:
1678 error(_("Server does not allow request for unadvertised object %s"),
1679 sought[i]->name);
1680 break;
1681 }
1682 ret = 1;
1683 }
1684 return ret;
1685 }
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