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fetch-pack: disregard invalid pack lockfiles
[git/debian.git] / fetch-pack.c
blob4625926cf07ea10f038876d1950bc1aa1df28b2a
1 #include "cache.h"
2 #include "repository.h"
3 #include "config.h"
4 #include "lockfile.h"
5 #include "refs.h"
6 #include "pkt-line.h"
7 #include "commit.h"
8 #include "tag.h"
9 #include "exec-cmd.h"
10 #include "pack.h"
11 #include "sideband.h"
12 #include "fetch-pack.h"
13 #include "remote.h"
14 #include "run-command.h"
15 #include "connect.h"
16 #include "transport.h"
17 #include "version.h"
18 #include "oid-array.h"
19 #include "oidset.h"
20 #include "packfile.h"
21 #include "object-store.h"
22 #include "connected.h"
23 #include "fetch-negotiator.h"
24 #include "fsck.h"
25 #include "shallow.h"
26
27 static int transfer_unpack_limit = -1;
28 static int fetch_unpack_limit = -1;
29 static int unpack_limit = 100;
30 static int prefer_ofs_delta = 1;
31 static int no_done;
32 static int deepen_since_ok;
33 static int deepen_not_ok;
34 static int fetch_fsck_objects = -1;
35 static int transfer_fsck_objects = -1;
36 static int agent_supported;
37 static int server_supports_filtering;
38 static struct shallow_lock shallow_lock;
39 static const char *alternate_shallow_file;
40 static struct strbuf fsck_msg_types = STRBUF_INIT;
41 static struct string_list uri_protocols = STRING_LIST_INIT_DUP;
42
43 /* Remember to update object flag allocation in object.h */
44 #define COMPLETE (1U << 0)
45 #define ALTERNATE (1U << 1)
46
47 /*
48 * After sending this many "have"s if we do not get any new ACK , we
49 * give up traversing our history.
50 */
51 #define MAX_IN_VAIN 256
52
53 static int multi_ack, use_sideband;
54 /* Allow specifying sha1 if it is a ref tip. */
55 #define ALLOW_TIP_SHA1 01
56 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
57 #define ALLOW_REACHABLE_SHA1 02
58 static unsigned int allow_unadvertised_object_request;
59
60 __attribute__((format (printf, 2, 3)))
61 static inline void print_verbose(const struct fetch_pack_args *args,
62 const char *fmt, ...)
63 {
64 va_list params;
65
66 if (!args->verbose)
67 return;
68
69 va_start(params, fmt);
70 vfprintf(stderr, fmt, params);
71 va_end(params);
72 fputc('\n', stderr);
73 }
74
75 struct alternate_object_cache {
76 struct object **items;
77 size_t nr, alloc;
78 };
79
80 static void cache_one_alternate(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 struct commit *deref_without_lazy_fetch(const struct object_id *oid,
112 int mark_tags_complete)
113 {
114 enum object_type type;
115 struct object_info info = { .typep = &type };
116
117 while (1) {
118 if (oid_object_info_extended(the_repository, oid, &info,
119 OBJECT_INFO_SKIP_FETCH_OBJECT | OBJECT_INFO_QUICK))
120 return NULL;
121 if (type == OBJ_TAG) {
122 struct tag *tag = (struct tag *)
123 parse_object(the_repository, oid);
124
125 if (!tag->tagged)
126 return NULL;
127 if (mark_tags_complete)
128 tag->object.flags |= COMPLETE;
129 oid = &tag->tagged->oid;
130 } else {
131 break;
132 }
133 }
134 if (type == OBJ_COMMIT)
135 return (struct commit *) parse_object(the_repository, oid);
136 return NULL;
137 }
138
139 static int rev_list_insert_ref(struct fetch_negotiator *negotiator,
140 const struct object_id *oid)
141 {
142 struct commit *c = deref_without_lazy_fetch(oid, 0);
143
144 if (c)
145 negotiator->add_tip(negotiator, c);
146 return 0;
147 }
148
149 static int rev_list_insert_ref_oid(const char *refname, const struct object_id *oid,
150 int flag, void *cb_data)
151 {
152 return rev_list_insert_ref(cb_data, oid);
153 }
154
155 enum ack_type {
156 NAK = 0,
157 ACK,
158 ACK_continue,
159 ACK_common,
160 ACK_ready
161 };
162
163 static void consume_shallow_list(struct fetch_pack_args *args,
164 struct packet_reader *reader)
165 {
166 if (args->stateless_rpc && args->deepen) {
167 /* If we sent a depth we will get back "duplicate"
168 * shallow and unshallow commands every time there
169 * is a block of have lines exchanged.
170 */
171 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
172 if (starts_with(reader->line, "shallow "))
173 continue;
174 if (starts_with(reader->line, "unshallow "))
175 continue;
176 die(_("git fetch-pack: expected shallow list"));
177 }
178 if (reader->status != PACKET_READ_FLUSH)
179 die(_("git fetch-pack: expected a flush packet after shallow list"));
180 }
181 }
182
183 static enum ack_type get_ack(struct packet_reader *reader,
184 struct object_id *result_oid)
185 {
186 int len;
187 const char *arg;
188
189 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
190 die(_("git fetch-pack: expected ACK/NAK, got a flush packet"));
191 len = reader->pktlen;
192
193 if (!strcmp(reader->line, "NAK"))
194 return NAK;
195 if (skip_prefix(reader->line, "ACK ", &arg)) {
196 const char *p;
197 if (!parse_oid_hex(arg, result_oid, &p)) {
198 len -= p - reader->line;
199 if (len < 1)
200 return ACK;
201 if (strstr(p, "continue"))
202 return ACK_continue;
203 if (strstr(p, "common"))
204 return ACK_common;
205 if (strstr(p, "ready"))
206 return ACK_ready;
207 return ACK;
208 }
209 }
210 die(_("git fetch-pack: expected ACK/NAK, got '%s'"), reader->line);
211 }
212
213 static void send_request(struct fetch_pack_args *args,
214 int fd, struct strbuf *buf)
215 {
216 if (args->stateless_rpc) {
217 send_sideband(fd, -1, buf->buf, buf->len, LARGE_PACKET_MAX);
218 packet_flush(fd);
219 } else {
220 if (write_in_full(fd, buf->buf, buf->len) < 0)
221 die_errno(_("unable to write to remote"));
222 }
223 }
224
225 static void insert_one_alternate_object(struct fetch_negotiator *negotiator,
226 struct object *obj)
227 {
228 rev_list_insert_ref(negotiator, &obj->oid);
229 }
230
231 #define INITIAL_FLUSH 16
232 #define PIPESAFE_FLUSH 32
233 #define LARGE_FLUSH 16384
234
235 static int next_flush(int stateless_rpc, int count)
236 {
237 if (stateless_rpc) {
238 if (count < LARGE_FLUSH)
239 count <<= 1;
240 else
241 count = count * 11 / 10;
242 } else {
243 if (count < PIPESAFE_FLUSH)
244 count <<= 1;
245 else
246 count += PIPESAFE_FLUSH;
247 }
248 return count;
249 }
250
251 static void mark_tips(struct fetch_negotiator *negotiator,
252 const struct oid_array *negotiation_tips)
253 {
254 int i;
255
256 if (!negotiation_tips) {
257 for_each_rawref(rev_list_insert_ref_oid, negotiator);
258 return;
259 }
260
261 for (i = 0; i < negotiation_tips->nr; i++)
262 rev_list_insert_ref(negotiator, &negotiation_tips->oid[i]);
263 return;
264 }
265
266 static int find_common(struct fetch_negotiator *negotiator,
267 struct fetch_pack_args *args,
268 int fd[2], struct object_id *result_oid,
269 struct ref *refs)
270 {
271 int fetching;
272 int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval;
273 const struct object_id *oid;
274 unsigned in_vain = 0;
275 int got_continue = 0;
276 int got_ready = 0;
277 struct strbuf req_buf = STRBUF_INIT;
278 size_t state_len = 0;
279 struct packet_reader reader;
280
281 if (args->stateless_rpc && multi_ack == 1)
282 die(_("--stateless-rpc requires multi_ack_detailed"));
283
284 packet_reader_init(&reader, fd[0], NULL, 0,
285 PACKET_READ_CHOMP_NEWLINE |
286 PACKET_READ_DIE_ON_ERR_PACKET);
287
288 mark_tips(negotiator, args->negotiation_tips);
289 for_each_cached_alternate(negotiator, insert_one_alternate_object);
290
291 fetching = 0;
292 for ( ; refs ; refs = refs->next) {
293 struct object_id *remote = &refs->old_oid;
294 const char *remote_hex;
295 struct object *o;
296
297 /*
298 * If that object is complete (i.e. it is an ancestor of a
299 * local ref), we tell them we have it but do not have to
300 * tell them about its ancestors, which they already know
301 * about.
302 *
303 * We use lookup_object here because we are only
304 * interested in the case we *know* the object is
305 * reachable and we have already scanned it.
306 */
307 if (((o = lookup_object(the_repository, remote)) != NULL) &&
308 (o->flags & COMPLETE)) {
309 continue;
310 }
311
312 remote_hex = oid_to_hex(remote);
313 if (!fetching) {
314 struct strbuf c = STRBUF_INIT;
315 if (multi_ack == 2) strbuf_addstr(&c, " multi_ack_detailed");
316 if (multi_ack == 1) strbuf_addstr(&c, " multi_ack");
317 if (no_done) strbuf_addstr(&c, " no-done");
318 if (use_sideband == 2) strbuf_addstr(&c, " side-band-64k");
319 if (use_sideband == 1) strbuf_addstr(&c, " side-band");
320 if (args->deepen_relative) strbuf_addstr(&c, " deepen-relative");
321 if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack");
322 if (args->no_progress) strbuf_addstr(&c, " no-progress");
323 if (args->include_tag) strbuf_addstr(&c, " include-tag");
324 if (prefer_ofs_delta) strbuf_addstr(&c, " ofs-delta");
325 if (deepen_since_ok) strbuf_addstr(&c, " deepen-since");
326 if (deepen_not_ok) strbuf_addstr(&c, " deepen-not");
327 if (agent_supported) strbuf_addf(&c, " agent=%s",
328 git_user_agent_sanitized());
329 if (args->filter_options.choice)
330 strbuf_addstr(&c, " filter");
331 packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
332 strbuf_release(&c);
333 } else
334 packet_buf_write(&req_buf, "want %s\n", remote_hex);
335 fetching++;
336 }
337
338 if (!fetching) {
339 strbuf_release(&req_buf);
340 packet_flush(fd[1]);
341 return 1;
342 }
343
344 if (is_repository_shallow(the_repository))
345 write_shallow_commits(&req_buf, 1, NULL);
346 if (args->depth > 0)
347 packet_buf_write(&req_buf, "deepen %d", args->depth);
348 if (args->deepen_since) {
349 timestamp_t max_age = approxidate(args->deepen_since);
350 packet_buf_write(&req_buf, "deepen-since %"PRItime, max_age);
351 }
352 if (args->deepen_not) {
353 int i;
354 for (i = 0; i < args->deepen_not->nr; i++) {
355 struct string_list_item *s = args->deepen_not->items + i;
356 packet_buf_write(&req_buf, "deepen-not %s", s->string);
357 }
358 }
359 if (server_supports_filtering && args->filter_options.choice) {
360 const char *spec =
361 expand_list_objects_filter_spec(&args->filter_options);
362 packet_buf_write(&req_buf, "filter %s", spec);
363 }
364 packet_buf_flush(&req_buf);
365 state_len = req_buf.len;
366
367 if (args->deepen) {
368 const char *arg;
369 struct object_id oid;
370
371 send_request(args, fd[1], &req_buf);
372 while (packet_reader_read(&reader) == PACKET_READ_NORMAL) {
373 if (skip_prefix(reader.line, "shallow ", &arg)) {
374 if (get_oid_hex(arg, &oid))
375 die(_("invalid shallow line: %s"), reader.line);
376 register_shallow(the_repository, &oid);
377 continue;
378 }
379 if (skip_prefix(reader.line, "unshallow ", &arg)) {
380 if (get_oid_hex(arg, &oid))
381 die(_("invalid unshallow line: %s"), reader.line);
382 if (!lookup_object(the_repository, &oid))
383 die(_("object not found: %s"), reader.line);
384 /* make sure that it is parsed as shallow */
385 if (!parse_object(the_repository, &oid))
386 die(_("error in object: %s"), reader.line);
387 if (unregister_shallow(&oid))
388 die(_("no shallow found: %s"), reader.line);
389 continue;
390 }
391 die(_("expected shallow/unshallow, got %s"), reader.line);
392 }
393 } else if (!args->stateless_rpc)
394 send_request(args, fd[1], &req_buf);
395
396 if (!args->stateless_rpc) {
397 /* If we aren't using the stateless-rpc interface
398 * we don't need to retain the headers.
399 */
400 strbuf_setlen(&req_buf, 0);
401 state_len = 0;
402 }
403
404 trace2_region_enter("fetch-pack", "negotiation_v0_v1", the_repository);
405 flushes = 0;
406 retval = -1;
407 while ((oid = negotiator->next(negotiator))) {
408 packet_buf_write(&req_buf, "have %s\n", oid_to_hex(oid));
409 print_verbose(args, "have %s", oid_to_hex(oid));
410 in_vain++;
411 if (flush_at <= ++count) {
412 int ack;
413
414 packet_buf_flush(&req_buf);
415 send_request(args, fd[1], &req_buf);
416 strbuf_setlen(&req_buf, state_len);
417 flushes++;
418 flush_at = next_flush(args->stateless_rpc, count);
419
420 /*
421 * We keep one window "ahead" of the other side, and
422 * will wait for an ACK only on the next one
423 */
424 if (!args->stateless_rpc && count == INITIAL_FLUSH)
425 continue;
426
427 consume_shallow_list(args, &reader);
428 do {
429 ack = get_ack(&reader, result_oid);
430 if (ack)
431 print_verbose(args, _("got %s %d %s"), "ack",
432 ack, oid_to_hex(result_oid));
433 switch (ack) {
434 case ACK:
435 flushes = 0;
436 multi_ack = 0;
437 retval = 0;
438 goto done;
439 case ACK_common:
440 case ACK_ready:
441 case ACK_continue: {
442 struct commit *commit =
443 lookup_commit(the_repository,
444 result_oid);
445 int was_common;
446
447 if (!commit)
448 die(_("invalid commit %s"), oid_to_hex(result_oid));
449 was_common = negotiator->ack(negotiator, commit);
450 if (args->stateless_rpc
451 && ack == ACK_common
452 && !was_common) {
453 /* We need to replay the have for this object
454 * on the next RPC request so the peer knows
455 * it is in common with us.
456 */
457 const char *hex = oid_to_hex(result_oid);
458 packet_buf_write(&req_buf, "have %s\n", hex);
459 state_len = req_buf.len;
460 /*
461 * Reset in_vain because an ack
462 * for this commit has not been
463 * seen.
464 */
465 in_vain = 0;
466 } else if (!args->stateless_rpc
467 || ack != ACK_common)
468 in_vain = 0;
469 retval = 0;
470 got_continue = 1;
471 if (ack == ACK_ready)
472 got_ready = 1;
473 break;
474 }
475 }
476 } while (ack);
477 flushes--;
478 if (got_continue && MAX_IN_VAIN < in_vain) {
479 print_verbose(args, _("giving up"));
480 break; /* give up */
481 }
482 if (got_ready)
483 break;
484 }
485 }
486 done:
487 trace2_region_leave("fetch-pack", "negotiation_v0_v1", the_repository);
488 if (!got_ready || !no_done) {
489 packet_buf_write(&req_buf, "done\n");
490 send_request(args, fd[1], &req_buf);
491 }
492 print_verbose(args, _("done"));
493 if (retval != 0) {
494 multi_ack = 0;
495 flushes++;
496 }
497 strbuf_release(&req_buf);
498
499 if (!got_ready || !no_done)
500 consume_shallow_list(args, &reader);
501 while (flushes || multi_ack) {
502 int ack = get_ack(&reader, result_oid);
503 if (ack) {
504 print_verbose(args, _("got %s (%d) %s"), "ack",
505 ack, oid_to_hex(result_oid));
506 if (ack == ACK)
507 return 0;
508 multi_ack = 1;
509 continue;
510 }
511 flushes--;
512 }
513 /* it is no error to fetch into a completely empty repo */
514 return count ? retval : 0;
515 }
516
517 static struct commit_list *complete;
518
519 static int mark_complete(const struct object_id *oid)
520 {
521 struct commit *commit = deref_without_lazy_fetch(oid, 1);
522
523 if (commit && !(commit->object.flags & COMPLETE)) {
524 commit->object.flags |= COMPLETE;
525 commit_list_insert(commit, &complete);
526 }
527 return 0;
528 }
529
530 static int mark_complete_oid(const char *refname, const struct object_id *oid,
531 int flag, void *cb_data)
532 {
533 return mark_complete(oid);
534 }
535
536 static void mark_recent_complete_commits(struct fetch_pack_args *args,
537 timestamp_t cutoff)
538 {
539 while (complete && cutoff <= complete->item->date) {
540 print_verbose(args, _("Marking %s as complete"),
541 oid_to_hex(&complete->item->object.oid));
542 pop_most_recent_commit(&complete, COMPLETE);
543 }
544 }
545
546 static void add_refs_to_oidset(struct oidset *oids, struct ref *refs)
547 {
548 for (; refs; refs = refs->next)
549 oidset_insert(oids, &refs->old_oid);
550 }
551
552 static int is_unmatched_ref(const struct ref *ref)
553 {
554 struct object_id oid;
555 const char *p;
556 return ref->match_status == REF_NOT_MATCHED &&
557 !parse_oid_hex(ref->name, &oid, &p) &&
558 *p == '\0' &&
559 oideq(&oid, &ref->old_oid);
560 }
561
562 static void filter_refs(struct fetch_pack_args *args,
563 struct ref **refs,
564 struct ref **sought, int nr_sought)
565 {
566 struct ref *newlist = NULL;
567 struct ref **newtail = &newlist;
568 struct ref *unmatched = NULL;
569 struct ref *ref, *next;
570 struct oidset tip_oids = OIDSET_INIT;
571 int i;
572 int strict = !(allow_unadvertised_object_request &
573 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
574
575 i = 0;
576 for (ref = *refs; ref; ref = next) {
577 int keep = 0;
578 next = ref->next;
579
580 if (starts_with(ref->name, "refs/") &&
581 check_refname_format(ref->name, 0)) {
582 /*
583 * trash or a peeled value; do not even add it to
584 * unmatched list
585 */
586 free_one_ref(ref);
587 continue;
588 } else {
589 while (i < nr_sought) {
590 int cmp = strcmp(ref->name, sought[i]->name);
591 if (cmp < 0)
592 break; /* definitely do not have it */
593 else if (cmp == 0) {
594 keep = 1; /* definitely have it */
595 sought[i]->match_status = REF_MATCHED;
596 }
597 i++;
598 }
599
600 if (!keep && args->fetch_all &&
601 (!args->deepen || !starts_with(ref->name, "refs/tags/")))
602 keep = 1;
603 }
604
605 if (keep) {
606 *newtail = ref;
607 ref->next = NULL;
608 newtail = &ref->next;
609 } else {
610 ref->next = unmatched;
611 unmatched = ref;
612 }
613 }
614
615 if (strict) {
616 for (i = 0; i < nr_sought; i++) {
617 ref = sought[i];
618 if (!is_unmatched_ref(ref))
619 continue;
620
621 add_refs_to_oidset(&tip_oids, unmatched);
622 add_refs_to_oidset(&tip_oids, newlist);
623 break;
624 }
625 }
626
627 /* Append unmatched requests to the list */
628 for (i = 0; i < nr_sought; i++) {
629 ref = sought[i];
630 if (!is_unmatched_ref(ref))
631 continue;
632
633 if (!strict || oidset_contains(&tip_oids, &ref->old_oid)) {
634 ref->match_status = REF_MATCHED;
635 *newtail = copy_ref(ref);
636 newtail = &(*newtail)->next;
637 } else {
638 ref->match_status = REF_UNADVERTISED_NOT_ALLOWED;
639 }
640 }
641
642 oidset_clear(&tip_oids);
643 free_refs(unmatched);
644
645 *refs = newlist;
646 }
647
648 static void mark_alternate_complete(struct fetch_negotiator *unused,
649 struct object *obj)
650 {
651 mark_complete(&obj->oid);
652 }
653
654 struct loose_object_iter {
655 struct oidset *loose_object_set;
656 struct ref *refs;
657 };
658
659 /*
660 * Mark recent commits available locally and reachable from a local ref as
661 * COMPLETE.
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
675 save_commit_buffer = 0;
676
677 trace2_region_enter("fetch-pack", "parse_remote_refs_and_find_cutoff", NULL);
678 for (ref = *refs; ref; ref = ref->next) {
679 struct object *o;
680
681 if (!has_object_file_with_flags(&ref->old_oid,
682 OBJECT_INFO_QUICK |
683 OBJECT_INFO_SKIP_FETCH_OBJECT))
684 continue;
685 o = parse_object(the_repository, &ref->old_oid);
686 if (!o)
687 continue;
688
689 /*
690 * We already have it -- which may mean that we were
691 * in sync with the other side at some time after
692 * that (it is OK if we guess wrong here).
693 */
694 if (o->type == OBJ_COMMIT) {
695 struct commit *commit = (struct commit *)o;
696 if (!cutoff || cutoff < commit->date)
697 cutoff = commit->date;
698 }
699 }
700 trace2_region_leave("fetch-pack", "parse_remote_refs_and_find_cutoff", NULL);
701
702 /*
703 * This block marks all local refs as COMPLETE, and then recursively marks all
704 * parents of those refs as COMPLETE.
705 */
706 trace2_region_enter("fetch-pack", "mark_complete_local_refs", NULL);
707 if (!args->deepen) {
708 for_each_rawref(mark_complete_oid, NULL);
709 for_each_cached_alternate(NULL, mark_alternate_complete);
710 commit_list_sort_by_date(&complete);
711 if (cutoff)
712 mark_recent_complete_commits(args, cutoff);
713 }
714 trace2_region_leave("fetch-pack", "mark_complete_local_refs", NULL);
715
716 /*
717 * Mark all complete remote refs as common refs.
718 * Don't mark them common yet; the server has to be told so first.
719 */
720 trace2_region_enter("fetch-pack", "mark_common_remote_refs", NULL);
721 for (ref = *refs; ref; ref = ref->next) {
722 struct commit *c = deref_without_lazy_fetch(&ref->old_oid, 0);
723
724 if (!c || !(c->object.flags & COMPLETE))
725 continue;
726
727 negotiator->known_common(negotiator, c);
728 }
729 trace2_region_leave("fetch-pack", "mark_common_remote_refs", NULL);
730
731 save_commit_buffer = old_save_commit_buffer;
732 }
733
734 /*
735 * Returns 1 if every object pointed to by the given remote refs is available
736 * locally and reachable from a local ref, and 0 otherwise.
737 */
738 static int everything_local(struct fetch_pack_args *args,
739 struct ref **refs)
740 {
741 struct ref *ref;
742 int retval;
743
744 for (retval = 1, ref = *refs; ref ; ref = ref->next) {
745 const struct object_id *remote = &ref->old_oid;
746 struct object *o;
747
748 o = lookup_object(the_repository, remote);
749 if (!o || !(o->flags & COMPLETE)) {
750 retval = 0;
751 print_verbose(args, "want %s (%s)", oid_to_hex(remote),
752 ref->name);
753 continue;
754 }
755 print_verbose(args, _("already have %s (%s)"), oid_to_hex(remote),
756 ref->name);
757 }
758
759 return retval;
760 }
761
762 static int sideband_demux(int in, int out, void *data)
763 {
764 int *xd = data;
765 int ret;
766
767 ret = recv_sideband("fetch-pack", xd[0], out);
768 close(out);
769 return ret;
770 }
771
772 static void write_promisor_file(const char *keep_name,
773 struct ref **sought, int nr_sought)
774 {
775 struct strbuf promisor_name = STRBUF_INIT;
776 int suffix_stripped;
777 FILE *output;
778 int i;
779
780 strbuf_addstr(&promisor_name, keep_name);
781 suffix_stripped = strbuf_strip_suffix(&promisor_name, ".keep");
782 if (!suffix_stripped)
783 BUG("name of pack lockfile should end with .keep (was '%s')",
784 keep_name);
785 strbuf_addstr(&promisor_name, ".promisor");
786
787 output = xfopen(promisor_name.buf, "w");
788 for (i = 0; i < nr_sought; i++)
789 fprintf(output, "%s %s\n", oid_to_hex(&sought[i]->old_oid),
790 sought[i]->name);
791 fclose(output);
792
793 strbuf_release(&promisor_name);
794 }
795
796 /*
797 * Pass 1 as "only_packfile" if the pack received is the only pack in this
798 * fetch request (that is, if there were no packfile URIs provided).
799 */
800 static int get_pack(struct fetch_pack_args *args,
801 int xd[2], struct string_list *pack_lockfiles,
802 int only_packfile,
803 struct ref **sought, int nr_sought)
804 {
805 struct async demux;
806 int do_keep = args->keep_pack;
807 const char *cmd_name;
808 struct pack_header header;
809 int pass_header = 0;
810 struct child_process cmd = CHILD_PROCESS_INIT;
811 int ret;
812
813 memset(&demux, 0, sizeof(demux));
814 if (use_sideband) {
815 /* xd[] is talking with upload-pack; subprocess reads from
816 * xd[0], spits out band#2 to stderr, and feeds us band#1
817 * through demux->out.
818 */
819 demux.proc = sideband_demux;
820 demux.data = xd;
821 demux.out = -1;
822 demux.isolate_sigpipe = 1;
823 if (start_async(&demux))
824 die(_("fetch-pack: unable to fork off sideband demultiplexer"));
825 }
826 else
827 demux.out = xd[0];
828
829 if (!args->keep_pack && unpack_limit) {
830
831 if (read_pack_header(demux.out, &header))
832 die(_("protocol error: bad pack header"));
833 pass_header = 1;
834 if (ntohl(header.hdr_entries) < unpack_limit)
835 do_keep = 0;
836 else
837 do_keep = 1;
838 }
839
840 if (alternate_shallow_file) {
841 strvec_push(&cmd.args, "--shallow-file");
842 strvec_push(&cmd.args, alternate_shallow_file);
843 }
844
845 if (do_keep || args->from_promisor) {
846 if (pack_lockfiles)
847 cmd.out = -1;
848 cmd_name = "index-pack";
849 strvec_push(&cmd.args, cmd_name);
850 strvec_push(&cmd.args, "--stdin");
851 if (!args->quiet && !args->no_progress)
852 strvec_push(&cmd.args, "-v");
853 if (args->use_thin_pack)
854 strvec_push(&cmd.args, "--fix-thin");
855 if (do_keep && (args->lock_pack || unpack_limit)) {
856 char hostname[HOST_NAME_MAX + 1];
857 if (xgethostname(hostname, sizeof(hostname)))
858 xsnprintf(hostname, sizeof(hostname), "localhost");
859 strvec_pushf(&cmd.args,
860 "--keep=fetch-pack %"PRIuMAX " on %s",
861 (uintmax_t)getpid(), hostname);
862 }
863 if (only_packfile && args->check_self_contained_and_connected)
864 strvec_push(&cmd.args, "--check-self-contained-and-connected");
865 else
866 /*
867 * We cannot perform any connectivity checks because
868 * not all packs have been downloaded; let the caller
869 * have this responsibility.
870 */
871 args->check_self_contained_and_connected = 0;
872
873 if (args->from_promisor)
874 /*
875 * write_promisor_file() may be called afterwards but
876 * we still need index-pack to know that this is a
877 * promisor pack. For example, if transfer.fsckobjects
878 * is true, index-pack needs to know that .gitmodules
879 * is a promisor object (so that it won't complain if
880 * it is missing).
881 */
882 strvec_push(&cmd.args, "--promisor");
883 }
884 else {
885 cmd_name = "unpack-objects";
886 strvec_push(&cmd.args, cmd_name);
887 if (args->quiet || args->no_progress)
888 strvec_push(&cmd.args, "-q");
889 args->check_self_contained_and_connected = 0;
890 }
891
892 if (pass_header)
893 strvec_pushf(&cmd.args, "--pack_header=%"PRIu32",%"PRIu32,
894 ntohl(header.hdr_version),
895 ntohl(header.hdr_entries));
896 if (fetch_fsck_objects >= 0
897 ? fetch_fsck_objects
898 : transfer_fsck_objects >= 0
899 ? transfer_fsck_objects
900 : 0) {
901 if (args->from_promisor || !only_packfile)
902 /*
903 * We cannot use --strict in index-pack because it
904 * checks both broken objects and links, but we only
905 * want to check for broken objects.
906 */
907 strvec_push(&cmd.args, "--fsck-objects");
908 else
909 strvec_pushf(&cmd.args, "--strict%s",
910 fsck_msg_types.buf);
911 }
912
913 cmd.in = demux.out;
914 cmd.git_cmd = 1;
915 if (start_command(&cmd))
916 die(_("fetch-pack: unable to fork off %s"), cmd_name);
917 if (do_keep && pack_lockfiles) {
918 char *pack_lockfile = index_pack_lockfile(cmd.out);
919 if (pack_lockfile)
920 string_list_append_nodup(pack_lockfiles, pack_lockfile);
921 close(cmd.out);
922 }
923
924 if (!use_sideband)
925 /* Closed by start_command() */
926 xd[0] = -1;
927
928 ret = finish_command(&cmd);
929 if (!ret || (args->check_self_contained_and_connected && ret == 1))
930 args->self_contained_and_connected =
931 args->check_self_contained_and_connected &&
932 ret == 0;
933 else
934 die(_("%s failed"), cmd_name);
935 if (use_sideband && finish_async(&demux))
936 die(_("error in sideband demultiplexer"));
937
938 /*
939 * Now that index-pack has succeeded, write the promisor file using the
940 * obtained .keep filename if necessary
941 */
942 if (do_keep && pack_lockfiles && pack_lockfiles->nr && args->from_promisor)
943 write_promisor_file(pack_lockfiles->items[0].string, sought, nr_sought);
944
945 return 0;
946 }
947
948 static int cmp_ref_by_name(const void *a_, const void *b_)
949 {
950 const struct ref *a = *((const struct ref **)a_);
951 const struct ref *b = *((const struct ref **)b_);
952 return strcmp(a->name, b->name);
953 }
954
955 static struct ref *do_fetch_pack(struct fetch_pack_args *args,
956 int fd[2],
957 const struct ref *orig_ref,
958 struct ref **sought, int nr_sought,
959 struct shallow_info *si,
960 struct string_list *pack_lockfiles)
961 {
962 struct repository *r = the_repository;
963 struct ref *ref = copy_ref_list(orig_ref);
964 struct object_id oid;
965 const char *agent_feature;
966 int agent_len;
967 struct fetch_negotiator negotiator_alloc;
968 struct fetch_negotiator *negotiator;
969
970 negotiator = &negotiator_alloc;
971 fetch_negotiator_init(r, negotiator);
972
973 sort_ref_list(&ref, ref_compare_name);
974 QSORT(sought, nr_sought, cmp_ref_by_name);
975
976 if ((agent_feature = server_feature_value("agent", &agent_len))) {
977 agent_supported = 1;
978 if (agent_len)
979 print_verbose(args, _("Server version is %.*s"),
980 agent_len, agent_feature);
981 }
982
983 if (server_supports("shallow"))
984 print_verbose(args, _("Server supports %s"), "shallow");
985 else if (args->depth > 0 || is_repository_shallow(r))
986 die(_("Server does not support shallow clients"));
987 if (args->depth > 0 || args->deepen_since || args->deepen_not)
988 args->deepen = 1;
989 if (server_supports("multi_ack_detailed")) {
990 print_verbose(args, _("Server supports %s"), "multi_ack_detailed");
991 multi_ack = 2;
992 if (server_supports("no-done")) {
993 print_verbose(args, _("Server supports %s"), "no-done");
994 if (args->stateless_rpc)
995 no_done = 1;
996 }
997 }
998 else if (server_supports("multi_ack")) {
999 print_verbose(args, _("Server supports %s"), "multi_ack");
1000 multi_ack = 1;
1001 }
1002 if (server_supports("side-band-64k")) {
1003 print_verbose(args, _("Server supports %s"), "side-band-64k");
1004 use_sideband = 2;
1005 }
1006 else if (server_supports("side-band")) {
1007 print_verbose(args, _("Server supports %s"), "side-band");
1008 use_sideband = 1;
1009 }
1010 if (server_supports("allow-tip-sha1-in-want")) {
1011 print_verbose(args, _("Server supports %s"), "allow-tip-sha1-in-want");
1012 allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1013 }
1014 if (server_supports("allow-reachable-sha1-in-want")) {
1015 print_verbose(args, _("Server supports %s"), "allow-reachable-sha1-in-want");
1016 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1017 }
1018 if (server_supports("thin-pack"))
1019 print_verbose(args, _("Server supports %s"), "thin-pack");
1020 else
1021 args->use_thin_pack = 0;
1022 if (server_supports("no-progress"))
1023 print_verbose(args, _("Server supports %s"), "no-progress");
1024 else
1025 args->no_progress = 0;
1026 if (server_supports("include-tag"))
1027 print_verbose(args, _("Server supports %s"), "include-tag");
1028 else
1029 args->include_tag = 0;
1030 if (server_supports("ofs-delta"))
1031 print_verbose(args, _("Server supports %s"), "ofs-delta");
1032 else
1033 prefer_ofs_delta = 0;
1034
1035 if (server_supports("filter")) {
1036 server_supports_filtering = 1;
1037 print_verbose(args, _("Server supports %s"), "filter");
1038 } else if (args->filter_options.choice) {
1039 warning("filtering not recognized by server, ignoring");
1040 }
1041
1042 if (server_supports("deepen-since")) {
1043 print_verbose(args, _("Server supports %s"), "deepen-since");
1044 deepen_since_ok = 1;
1045 } else if (args->deepen_since)
1046 die(_("Server does not support --shallow-since"));
1047 if (server_supports("deepen-not")) {
1048 print_verbose(args, _("Server supports %s"), "deepen-not");
1049 deepen_not_ok = 1;
1050 } else if (args->deepen_not)
1051 die(_("Server does not support --shallow-exclude"));
1052 if (server_supports("deepen-relative"))
1053 print_verbose(args, _("Server supports %s"), "deepen-relative");
1054 else if (args->deepen_relative)
1055 die(_("Server does not support --deepen"));
1056 if (!server_supports_hash(the_hash_algo->name, NULL))
1057 die(_("Server does not support this repository's object format"));
1058
1059 mark_complete_and_common_ref(negotiator, args, &ref);
1060 filter_refs(args, &ref, sought, nr_sought);
1061 if (everything_local(args, &ref)) {
1062 packet_flush(fd[1]);
1063 goto all_done;
1064 }
1065 if (find_common(negotiator, args, fd, &oid, ref) < 0)
1066 if (!args->keep_pack)
1067 /* When cloning, it is not unusual to have
1068 * no common commit.
1069 */
1070 warning(_("no common commits"));
1071
1072 if (args->stateless_rpc)
1073 packet_flush(fd[1]);
1074 if (args->deepen)
1075 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
1076 NULL);
1077 else if (si->nr_ours || si->nr_theirs)
1078 alternate_shallow_file = setup_temporary_shallow(si->shallow);
1079 else
1080 alternate_shallow_file = NULL;
1081 if (get_pack(args, fd, pack_lockfiles, 1, sought, nr_sought))
1082 die(_("git fetch-pack: fetch failed."));
1083
1084 all_done:
1085 if (negotiator)
1086 negotiator->release(negotiator);
1087 return ref;
1088 }
1089
1090 static void add_shallow_requests(struct strbuf *req_buf,
1091 const struct fetch_pack_args *args)
1092 {
1093 if (is_repository_shallow(the_repository))
1094 write_shallow_commits(req_buf, 1, NULL);
1095 if (args->depth > 0)
1096 packet_buf_write(req_buf, "deepen %d", args->depth);
1097 if (args->deepen_since) {
1098 timestamp_t max_age = approxidate(args->deepen_since);
1099 packet_buf_write(req_buf, "deepen-since %"PRItime, max_age);
1100 }
1101 if (args->deepen_not) {
1102 int i;
1103 for (i = 0; i < args->deepen_not->nr; i++) {
1104 struct string_list_item *s = args->deepen_not->items + i;
1105 packet_buf_write(req_buf, "deepen-not %s", s->string);
1106 }
1107 }
1108 if (args->deepen_relative)
1109 packet_buf_write(req_buf, "deepen-relative\n");
1110 }
1111
1112 static void add_wants(const struct ref *wants, struct strbuf *req_buf)
1113 {
1114 int use_ref_in_want = server_supports_feature("fetch", "ref-in-want", 0);
1115
1116 for ( ; wants ; wants = wants->next) {
1117 const struct object_id *remote = &wants->old_oid;
1118 struct object *o;
1119
1120 /*
1121 * If that object is complete (i.e. it is an ancestor of a
1122 * local ref), we tell them we have it but do not have to
1123 * tell them about its ancestors, which they already know
1124 * about.
1125 *
1126 * We use lookup_object here because we are only
1127 * interested in the case we *know* the object is
1128 * reachable and we have already scanned it.
1129 */
1130 if (((o = lookup_object(the_repository, remote)) != NULL) &&
1131 (o->flags & COMPLETE)) {
1132 continue;
1133 }
1134
1135 if (!use_ref_in_want || wants->exact_oid)
1136 packet_buf_write(req_buf, "want %s\n", oid_to_hex(remote));
1137 else
1138 packet_buf_write(req_buf, "want-ref %s\n", wants->name);
1139 }
1140 }
1141
1142 static void add_common(struct strbuf *req_buf, struct oidset *common)
1143 {
1144 struct oidset_iter iter;
1145 const struct object_id *oid;
1146 oidset_iter_init(common, &iter);
1147
1148 while ((oid = oidset_iter_next(&iter))) {
1149 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1150 }
1151 }
1152
1153 static int add_haves(struct fetch_negotiator *negotiator,
1154 int seen_ack,
1155 struct strbuf *req_buf,
1156 int *haves_to_send, int *in_vain)
1157 {
1158 int ret = 0;
1159 int haves_added = 0;
1160 const struct object_id *oid;
1161
1162 while ((oid = negotiator->next(negotiator))) {
1163 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1164 if (++haves_added >= *haves_to_send)
1165 break;
1166 }
1167
1168 *in_vain += haves_added;
1169 if (!haves_added || (seen_ack && *in_vain >= MAX_IN_VAIN)) {
1170 /* Send Done */
1171 packet_buf_write(req_buf, "done\n");
1172 ret = 1;
1173 }
1174
1175 /* Increase haves to send on next round */
1176 *haves_to_send = next_flush(1, *haves_to_send);
1177
1178 return ret;
1179 }
1180
1181 static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out,
1182 struct fetch_pack_args *args,
1183 const struct ref *wants, struct oidset *common,
1184 int *haves_to_send, int *in_vain,
1185 int sideband_all, int seen_ack)
1186 {
1187 int ret = 0;
1188 const char *hash_name;
1189 struct strbuf req_buf = STRBUF_INIT;
1190
1191 if (server_supports_v2("fetch", 1))
1192 packet_buf_write(&req_buf, "command=fetch");
1193 if (server_supports_v2("agent", 0))
1194 packet_buf_write(&req_buf, "agent=%s", git_user_agent_sanitized());
1195 if (args->server_options && args->server_options->nr &&
1196 server_supports_v2("server-option", 1)) {
1197 int i;
1198 for (i = 0; i < args->server_options->nr; i++)
1199 packet_buf_write(&req_buf, "server-option=%s",
1200 args->server_options->items[i].string);
1201 }
1202
1203 if (server_feature_v2("object-format", &hash_name)) {
1204 int hash_algo = hash_algo_by_name(hash_name);
1205 if (hash_algo_by_ptr(the_hash_algo) != hash_algo)
1206 die(_("mismatched algorithms: client %s; server %s"),
1207 the_hash_algo->name, hash_name);
1208 packet_write_fmt(fd_out, "object-format=%s", the_hash_algo->name);
1209 } else if (hash_algo_by_ptr(the_hash_algo) != GIT_HASH_SHA1) {
1210 die(_("the server does not support algorithm '%s'"),
1211 the_hash_algo->name);
1212 }
1213
1214 packet_buf_delim(&req_buf);
1215 if (args->use_thin_pack)
1216 packet_buf_write(&req_buf, "thin-pack");
1217 if (args->no_progress)
1218 packet_buf_write(&req_buf, "no-progress");
1219 if (args->include_tag)
1220 packet_buf_write(&req_buf, "include-tag");
1221 if (prefer_ofs_delta)
1222 packet_buf_write(&req_buf, "ofs-delta");
1223 if (sideband_all)
1224 packet_buf_write(&req_buf, "sideband-all");
1225
1226 /* Add shallow-info and deepen request */
1227 if (server_supports_feature("fetch", "shallow", 0))
1228 add_shallow_requests(&req_buf, args);
1229 else if (is_repository_shallow(the_repository) || args->deepen)
1230 die(_("Server does not support shallow requests"));
1231
1232 /* Add filter */
1233 if (server_supports_feature("fetch", "filter", 0) &&
1234 args->filter_options.choice) {
1235 const char *spec =
1236 expand_list_objects_filter_spec(&args->filter_options);
1237 print_verbose(args, _("Server supports filter"));
1238 packet_buf_write(&req_buf, "filter %s", spec);
1239 } else if (args->filter_options.choice) {
1240 warning("filtering not recognized by server, ignoring");
1241 }
1242
1243 if (server_supports_feature("fetch", "packfile-uris", 0)) {
1244 int i;
1245 struct strbuf to_send = STRBUF_INIT;
1246
1247 for (i = 0; i < uri_protocols.nr; i++) {
1248 const char *s = uri_protocols.items[i].string;
1249
1250 if (!strcmp(s, "https") || !strcmp(s, "http")) {
1251 if (to_send.len)
1252 strbuf_addch(&to_send, ',');
1253 strbuf_addstr(&to_send, s);
1254 }
1255 }
1256 if (to_send.len) {
1257 packet_buf_write(&req_buf, "packfile-uris %s",
1258 to_send.buf);
1259 strbuf_release(&to_send);
1260 }
1261 }
1262
1263 /* add wants */
1264 add_wants(wants, &req_buf);
1265
1266 /* Add all of the common commits we've found in previous rounds */
1267 add_common(&req_buf, common);
1268
1269 /* Add initial haves */
1270 ret = add_haves(negotiator, seen_ack, &req_buf,
1271 haves_to_send, in_vain);
1272
1273 /* Send request */
1274 packet_buf_flush(&req_buf);
1275 if (write_in_full(fd_out, req_buf.buf, req_buf.len) < 0)
1276 die_errno(_("unable to write request to remote"));
1277
1278 strbuf_release(&req_buf);
1279 return ret;
1280 }
1281
1282 /*
1283 * Processes a section header in a server's response and checks if it matches
1284 * `section`. If the value of `peek` is 1, the header line will be peeked (and
1285 * not consumed); if 0, the line will be consumed and the function will die if
1286 * the section header doesn't match what was expected.
1287 */
1288 static int process_section_header(struct packet_reader *reader,
1289 const char *section, int peek)
1290 {
1291 int ret;
1292
1293 if (packet_reader_peek(reader) != PACKET_READ_NORMAL)
1294 die(_("error reading section header '%s'"), section);
1295
1296 ret = !strcmp(reader->line, section);
1297
1298 if (!peek) {
1299 if (!ret)
1300 die(_("expected '%s', received '%s'"),
1301 section, reader->line);
1302 packet_reader_read(reader);
1303 }
1304
1305 return ret;
1306 }
1307
1308 enum common_found {
1309 /*
1310 * No commit was found to be possessed by both the client and the
1311 * server, and "ready" was not received.
1312 */
1313 NO_COMMON_FOUND,
1314
1315 /*
1316 * At least one commit was found to be possessed by both the client and
1317 * the server, and "ready" was not received.
1318 */
1319 COMMON_FOUND,
1320
1321 /*
1322 * "ready" was received, indicating that the server is ready to send
1323 * the packfile without any further negotiation.
1324 */
1325 READY
1326 };
1327
1328 static enum common_found process_acks(struct fetch_negotiator *negotiator,
1329 struct packet_reader *reader,
1330 struct oidset *common)
1331 {
1332 /* received */
1333 int received_ready = 0;
1334 int received_ack = 0;
1335
1336 process_section_header(reader, "acknowledgments", 0);
1337 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1338 const char *arg;
1339
1340 if (!strcmp(reader->line, "NAK"))
1341 continue;
1342
1343 if (skip_prefix(reader->line, "ACK ", &arg)) {
1344 struct object_id oid;
1345 received_ack = 1;
1346 if (!get_oid_hex(arg, &oid)) {
1347 struct commit *commit;
1348 oidset_insert(common, &oid);
1349 commit = lookup_commit(the_repository, &oid);
1350 if (negotiator)
1351 negotiator->ack(negotiator, commit);
1352 }
1353 continue;
1354 }
1355
1356 if (!strcmp(reader->line, "ready")) {
1357 received_ready = 1;
1358 continue;
1359 }
1360
1361 die(_("unexpected acknowledgment line: '%s'"), reader->line);
1362 }
1363
1364 if (reader->status != PACKET_READ_FLUSH &&
1365 reader->status != PACKET_READ_DELIM)
1366 die(_("error processing acks: %d"), reader->status);
1367
1368 /*
1369 * If an "acknowledgments" section is sent, a packfile is sent if and
1370 * only if "ready" was sent in this section. The other sections
1371 * ("shallow-info" and "wanted-refs") are sent only if a packfile is
1372 * sent. Therefore, a DELIM is expected if "ready" is sent, and a FLUSH
1373 * otherwise.
1374 */
1375 if (received_ready && reader->status != PACKET_READ_DELIM)
1376 die(_("expected packfile to be sent after 'ready'"));
1377 if (!received_ready && reader->status != PACKET_READ_FLUSH)
1378 die(_("expected no other sections to be sent after no 'ready'"));
1379
1380 return received_ready ? READY :
1381 (received_ack ? COMMON_FOUND : NO_COMMON_FOUND);
1382 }
1383
1384 static void receive_shallow_info(struct fetch_pack_args *args,
1385 struct packet_reader *reader,
1386 struct oid_array *shallows,
1387 struct shallow_info *si)
1388 {
1389 int unshallow_received = 0;
1390
1391 process_section_header(reader, "shallow-info", 0);
1392 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1393 const char *arg;
1394 struct object_id oid;
1395
1396 if (skip_prefix(reader->line, "shallow ", &arg)) {
1397 if (get_oid_hex(arg, &oid))
1398 die(_("invalid shallow line: %s"), reader->line);
1399 oid_array_append(shallows, &oid);
1400 continue;
1401 }
1402 if (skip_prefix(reader->line, "unshallow ", &arg)) {
1403 if (get_oid_hex(arg, &oid))
1404 die(_("invalid unshallow line: %s"), reader->line);
1405 if (!lookup_object(the_repository, &oid))
1406 die(_("object not found: %s"), reader->line);
1407 /* make sure that it is parsed as shallow */
1408 if (!parse_object(the_repository, &oid))
1409 die(_("error in object: %s"), reader->line);
1410 if (unregister_shallow(&oid))
1411 die(_("no shallow found: %s"), reader->line);
1412 unshallow_received = 1;
1413 continue;
1414 }
1415 die(_("expected shallow/unshallow, got %s"), reader->line);
1416 }
1417
1418 if (reader->status != PACKET_READ_FLUSH &&
1419 reader->status != PACKET_READ_DELIM)
1420 die(_("error processing shallow info: %d"), reader->status);
1421
1422 if (args->deepen || unshallow_received) {
1423 /*
1424 * Treat these as shallow lines caused by our depth settings.
1425 * In v0, these lines cannot cause refs to be rejected; do the
1426 * same.
1427 */
1428 int i;
1429
1430 for (i = 0; i < shallows->nr; i++)
1431 register_shallow(the_repository, &shallows->oid[i]);
1432 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
1433 NULL);
1434 args->deepen = 1;
1435 } else if (shallows->nr) {
1436 /*
1437 * Treat these as shallow lines caused by the remote being
1438 * shallow. In v0, remote refs that reach these objects are
1439 * rejected (unless --update-shallow is set); do the same.
1440 */
1441 prepare_shallow_info(si, shallows);
1442 if (si->nr_ours || si->nr_theirs)
1443 alternate_shallow_file =
1444 setup_temporary_shallow(si->shallow);
1445 else
1446 alternate_shallow_file = NULL;
1447 } else {
1448 alternate_shallow_file = NULL;
1449 }
1450 }
1451
1452 static int cmp_name_ref(const void *name, const void *ref)
1453 {
1454 return strcmp(name, (*(struct ref **)ref)->name);
1455 }
1456
1457 static void receive_wanted_refs(struct packet_reader *reader,
1458 struct ref **sought, int nr_sought)
1459 {
1460 process_section_header(reader, "wanted-refs", 0);
1461 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1462 struct object_id oid;
1463 const char *end;
1464 struct ref **found;
1465
1466 if (parse_oid_hex(reader->line, &oid, &end) || *end++ != ' ')
1467 die(_("expected wanted-ref, got '%s'"), reader->line);
1468
1469 found = bsearch(end, sought, nr_sought, sizeof(*sought),
1470 cmp_name_ref);
1471 if (!found)
1472 die(_("unexpected wanted-ref: '%s'"), reader->line);
1473 oidcpy(&(*found)->old_oid, &oid);
1474 }
1475
1476 if (reader->status != PACKET_READ_DELIM)
1477 die(_("error processing wanted refs: %d"), reader->status);
1478 }
1479
1480 static void receive_packfile_uris(struct packet_reader *reader,
1481 struct string_list *uris)
1482 {
1483 process_section_header(reader, "packfile-uris", 0);
1484 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1485 if (reader->pktlen < the_hash_algo->hexsz ||
1486 reader->line[the_hash_algo->hexsz] != ' ')
1487 die("expected '<hash> <uri>', got: %s\n", reader->line);
1488
1489 string_list_append(uris, reader->line);
1490 }
1491 if (reader->status != PACKET_READ_DELIM)
1492 die("expected DELIM");
1493 }
1494
1495 enum fetch_state {
1496 FETCH_CHECK_LOCAL = 0,
1497 FETCH_SEND_REQUEST,
1498 FETCH_PROCESS_ACKS,
1499 FETCH_GET_PACK,
1500 FETCH_DONE,
1501 };
1502
1503 static void do_check_stateless_delimiter(const struct fetch_pack_args *args,
1504 struct packet_reader *reader)
1505 {
1506 check_stateless_delimiter(args->stateless_rpc, reader,
1507 _("git fetch-pack: expected response end packet"));
1508 }
1509
1510 static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
1511 int fd[2],
1512 const struct ref *orig_ref,
1513 struct ref **sought, int nr_sought,
1514 struct oid_array *shallows,
1515 struct shallow_info *si,
1516 struct string_list *pack_lockfiles)
1517 {
1518 struct repository *r = the_repository;
1519 struct ref *ref = copy_ref_list(orig_ref);
1520 enum fetch_state state = FETCH_CHECK_LOCAL;
1521 struct oidset common = OIDSET_INIT;
1522 struct packet_reader reader;
1523 int in_vain = 0, negotiation_started = 0;
1524 int haves_to_send = INITIAL_FLUSH;
1525 struct fetch_negotiator negotiator_alloc;
1526 struct fetch_negotiator *negotiator;
1527 int seen_ack = 0;
1528 struct string_list packfile_uris = STRING_LIST_INIT_DUP;
1529 int i;
1530
1531 negotiator = &negotiator_alloc;
1532 fetch_negotiator_init(r, negotiator);
1533
1534 packet_reader_init(&reader, fd[0], NULL, 0,
1535 PACKET_READ_CHOMP_NEWLINE |
1536 PACKET_READ_DIE_ON_ERR_PACKET);
1537 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 1) &&
1538 server_supports_feature("fetch", "sideband-all", 0)) {
1539 reader.use_sideband = 1;
1540 reader.me = "fetch-pack";
1541 }
1542
1543 while (state != FETCH_DONE) {
1544 switch (state) {
1545 case FETCH_CHECK_LOCAL:
1546 sort_ref_list(&ref, ref_compare_name);
1547 QSORT(sought, nr_sought, cmp_ref_by_name);
1548
1549 /* v2 supports these by default */
1550 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1551 use_sideband = 2;
1552 if (args->depth > 0 || args->deepen_since || args->deepen_not)
1553 args->deepen = 1;
1554
1555 /* Filter 'ref' by 'sought' and those that aren't local */
1556 mark_complete_and_common_ref(negotiator, args, &ref);
1557 filter_refs(args, &ref, sought, nr_sought);
1558 if (everything_local(args, &ref))
1559 state = FETCH_DONE;
1560 else
1561 state = FETCH_SEND_REQUEST;
1562
1563 mark_tips(negotiator, args->negotiation_tips);
1564 for_each_cached_alternate(negotiator,
1565 insert_one_alternate_object);
1566 break;
1567 case FETCH_SEND_REQUEST:
1568 if (!negotiation_started) {
1569 negotiation_started = 1;
1570 trace2_region_enter("fetch-pack",
1571 "negotiation_v2",
1572 the_repository);
1573 }
1574 if (send_fetch_request(negotiator, fd[1], args, ref,
1575 &common,
1576 &haves_to_send, &in_vain,
1577 reader.use_sideband,
1578 seen_ack))
1579 state = FETCH_GET_PACK;
1580 else
1581 state = FETCH_PROCESS_ACKS;
1582 break;
1583 case FETCH_PROCESS_ACKS:
1584 /* Process ACKs/NAKs */
1585 switch (process_acks(negotiator, &reader, &common)) {
1586 case READY:
1587 /*
1588 * Don't check for response delimiter; get_pack() will
1589 * read the rest of this response.
1590 */
1591 state = FETCH_GET_PACK;
1592 break;
1593 case COMMON_FOUND:
1594 in_vain = 0;
1595 seen_ack = 1;
1596 /* fallthrough */
1597 case NO_COMMON_FOUND:
1598 do_check_stateless_delimiter(args, &reader);
1599 state = FETCH_SEND_REQUEST;
1600 break;
1601 }
1602 break;
1603 case FETCH_GET_PACK:
1604 trace2_region_leave("fetch-pack",
1605 "negotiation_v2",
1606 the_repository);
1607 /* Check for shallow-info section */
1608 if (process_section_header(&reader, "shallow-info", 1))
1609 receive_shallow_info(args, &reader, shallows, si);
1610
1611 if (process_section_header(&reader, "wanted-refs", 1))
1612 receive_wanted_refs(&reader, sought, nr_sought);
1613
1614 /* get the pack(s) */
1615 if (process_section_header(&reader, "packfile-uris", 1))
1616 receive_packfile_uris(&reader, &packfile_uris);
1617 process_section_header(&reader, "packfile", 0);
1618 if (get_pack(args, fd, pack_lockfiles,
1619 !packfile_uris.nr, sought, nr_sought))
1620 die(_("git fetch-pack: fetch failed."));
1621 do_check_stateless_delimiter(args, &reader);
1622
1623 state = FETCH_DONE;
1624 break;
1625 case FETCH_DONE:
1626 continue;
1627 }
1628 }
1629
1630 for (i = 0; i < packfile_uris.nr; i++) {
1631 struct child_process cmd = CHILD_PROCESS_INIT;
1632 char packname[GIT_MAX_HEXSZ + 1];
1633 const char *uri = packfile_uris.items[i].string +
1634 the_hash_algo->hexsz + 1;
1635
1636 strvec_push(&cmd.args, "http-fetch");
1637 strvec_pushf(&cmd.args, "--packfile=%.*s",
1638 (int) the_hash_algo->hexsz,
1639 packfile_uris.items[i].string);
1640 strvec_push(&cmd.args, uri);
1641 cmd.git_cmd = 1;
1642 cmd.no_stdin = 1;
1643 cmd.out = -1;
1644 if (start_command(&cmd))
1645 die("fetch-pack: unable to spawn http-fetch");
1646
1647 if (read_in_full(cmd.out, packname, 5) < 0 ||
1648 memcmp(packname, "keep\t", 5))
1649 die("fetch-pack: expected keep then TAB at start of http-fetch output");
1650
1651 if (read_in_full(cmd.out, packname,
1652 the_hash_algo->hexsz + 1) < 0 ||
1653 packname[the_hash_algo->hexsz] != '\n')
1654 die("fetch-pack: expected hash then LF at end of http-fetch output");
1655
1656 packname[the_hash_algo->hexsz] = '\0';
1657
1658 close(cmd.out);
1659
1660 if (finish_command(&cmd))
1661 die("fetch-pack: unable to finish http-fetch");
1662
1663 if (memcmp(packfile_uris.items[i].string, packname,
1664 the_hash_algo->hexsz))
1665 die("fetch-pack: pack downloaded from %s does not match expected hash %.*s",
1666 uri, (int) the_hash_algo->hexsz,
1667 packfile_uris.items[i].string);
1668
1669 string_list_append_nodup(pack_lockfiles,
1670 xstrfmt("%s/pack/pack-%s.keep",
1671 get_object_directory(),
1672 packname));
1673 }
1674 string_list_clear(&packfile_uris, 0);
1675
1676 if (negotiator)
1677 negotiator->release(negotiator);
1678
1679 oidset_clear(&common);
1680 return ref;
1681 }
1682
1683 static int fetch_pack_config_cb(const char *var, const char *value, void *cb)
1684 {
1685 if (strcmp(var, "fetch.fsck.skiplist") == 0) {
1686 const char *path;
1687
1688 if (git_config_pathname(&path, var, value))
1689 return 1;
1690 strbuf_addf(&fsck_msg_types, "%cskiplist=%s",
1691 fsck_msg_types.len ? ',' : '=', path);
1692 free((char *)path);
1693 return 0;
1694 }
1695
1696 if (skip_prefix(var, "fetch.fsck.", &var)) {
1697 if (is_valid_msg_type(var, value))
1698 strbuf_addf(&fsck_msg_types, "%c%s=%s",
1699 fsck_msg_types.len ? ',' : '=', var, value);
1700 else
1701 warning("Skipping unknown msg id '%s'", var);
1702 return 0;
1703 }
1704
1705 return git_default_config(var, value, cb);
1706 }
1707
1708 static void fetch_pack_config(void)
1709 {
1710 git_config_get_int("fetch.unpacklimit", &fetch_unpack_limit);
1711 git_config_get_int("transfer.unpacklimit", &transfer_unpack_limit);
1712 git_config_get_bool("repack.usedeltabaseoffset", &prefer_ofs_delta);
1713 git_config_get_bool("fetch.fsckobjects", &fetch_fsck_objects);
1714 git_config_get_bool("transfer.fsckobjects", &transfer_fsck_objects);
1715 if (!uri_protocols.nr) {
1716 char *str;
1717
1718 if (!git_config_get_string("fetch.uriprotocols", &str) && str) {
1719 string_list_split(&uri_protocols, str, ',', -1);
1720 free(str);
1721 }
1722 }
1723
1724 git_config(fetch_pack_config_cb, NULL);
1725 }
1726
1727 static void fetch_pack_setup(void)
1728 {
1729 static int did_setup;
1730 if (did_setup)
1731 return;
1732 fetch_pack_config();
1733 if (0 <= transfer_unpack_limit)
1734 unpack_limit = transfer_unpack_limit;
1735 else if (0 <= fetch_unpack_limit)
1736 unpack_limit = fetch_unpack_limit;
1737 did_setup = 1;
1738 }
1739
1740 static int remove_duplicates_in_refs(struct ref **ref, int nr)
1741 {
1742 struct string_list names = STRING_LIST_INIT_NODUP;
1743 int src, dst;
1744
1745 for (src = dst = 0; src < nr; src++) {
1746 struct string_list_item *item;
1747 item = string_list_insert(&names, ref[src]->name);
1748 if (item->util)
1749 continue; /* already have it */
1750 item->util = ref[src];
1751 if (src != dst)
1752 ref[dst] = ref[src];
1753 dst++;
1754 }
1755 for (src = dst; src < nr; src++)
1756 ref[src] = NULL;
1757 string_list_clear(&names, 0);
1758 return dst;
1759 }
1760
1761 static void update_shallow(struct fetch_pack_args *args,
1762 struct ref **sought, int nr_sought,
1763 struct shallow_info *si)
1764 {
1765 struct oid_array ref = OID_ARRAY_INIT;
1766 int *status;
1767 int i;
1768
1769 if (args->deepen && alternate_shallow_file) {
1770 if (*alternate_shallow_file == '\0') { /* --unshallow */
1771 unlink_or_warn(git_path_shallow(the_repository));
1772 rollback_shallow_file(the_repository, &shallow_lock);
1773 } else
1774 commit_shallow_file(the_repository, &shallow_lock);
1775 alternate_shallow_file = NULL;
1776 return;
1777 }
1778
1779 if (!si->shallow || !si->shallow->nr)
1780 return;
1781
1782 if (args->cloning) {
1783 /*
1784 * remote is shallow, but this is a clone, there are
1785 * no objects in repo to worry about. Accept any
1786 * shallow points that exist in the pack (iow in repo
1787 * after get_pack() and reprepare_packed_git())
1788 */
1789 struct oid_array extra = OID_ARRAY_INIT;
1790 struct object_id *oid = si->shallow->oid;
1791 for (i = 0; i < si->shallow->nr; i++)
1792 if (has_object_file(&oid[i]))
1793 oid_array_append(&extra, &oid[i]);
1794 if (extra.nr) {
1795 setup_alternate_shallow(&shallow_lock,
1796 &alternate_shallow_file,
1797 &extra);
1798 commit_shallow_file(the_repository, &shallow_lock);
1799 alternate_shallow_file = NULL;
1800 }
1801 oid_array_clear(&extra);
1802 return;
1803 }
1804
1805 if (!si->nr_ours && !si->nr_theirs)
1806 return;
1807
1808 remove_nonexistent_theirs_shallow(si);
1809 if (!si->nr_ours && !si->nr_theirs)
1810 return;
1811 for (i = 0; i < nr_sought; i++)
1812 oid_array_append(&ref, &sought[i]->old_oid);
1813 si->ref = &ref;
1814
1815 if (args->update_shallow) {
1816 /*
1817 * remote is also shallow, .git/shallow may be updated
1818 * so all refs can be accepted. Make sure we only add
1819 * shallow roots that are actually reachable from new
1820 * refs.
1821 */
1822 struct oid_array extra = OID_ARRAY_INIT;
1823 struct object_id *oid = si->shallow->oid;
1824 assign_shallow_commits_to_refs(si, NULL, NULL);
1825 if (!si->nr_ours && !si->nr_theirs) {
1826 oid_array_clear(&ref);
1827 return;
1828 }
1829 for (i = 0; i < si->nr_ours; i++)
1830 oid_array_append(&extra, &oid[si->ours[i]]);
1831 for (i = 0; i < si->nr_theirs; i++)
1832 oid_array_append(&extra, &oid[si->theirs[i]]);
1833 setup_alternate_shallow(&shallow_lock,
1834 &alternate_shallow_file,
1835 &extra);
1836 commit_shallow_file(the_repository, &shallow_lock);
1837 oid_array_clear(&extra);
1838 oid_array_clear(&ref);
1839 alternate_shallow_file = NULL;
1840 return;
1841 }
1842
1843 /*
1844 * remote is also shallow, check what ref is safe to update
1845 * without updating .git/shallow
1846 */
1847 status = xcalloc(nr_sought, sizeof(*status));
1848 assign_shallow_commits_to_refs(si, NULL, status);
1849 if (si->nr_ours || si->nr_theirs) {
1850 for (i = 0; i < nr_sought; i++)
1851 if (status[i])
1852 sought[i]->status = REF_STATUS_REJECT_SHALLOW;
1853 }
1854 free(status);
1855 oid_array_clear(&ref);
1856 }
1857
1858 static int iterate_ref_map(void *cb_data, struct object_id *oid)
1859 {
1860 struct ref **rm = cb_data;
1861 struct ref *ref = *rm;
1862
1863 if (!ref)
1864 return -1; /* end of the list */
1865 *rm = ref->next;
1866 oidcpy(oid, &ref->old_oid);
1867 return 0;
1868 }
1869
1870 struct ref *fetch_pack(struct fetch_pack_args *args,
1871 int fd[],
1872 const struct ref *ref,
1873 struct ref **sought, int nr_sought,
1874 struct oid_array *shallow,
1875 struct string_list *pack_lockfiles,
1876 enum protocol_version version)
1877 {
1878 struct ref *ref_cpy;
1879 struct shallow_info si;
1880 struct oid_array shallows_scratch = OID_ARRAY_INIT;
1881
1882 fetch_pack_setup();
1883 if (nr_sought)
1884 nr_sought = remove_duplicates_in_refs(sought, nr_sought);
1885
1886 if (version != protocol_v2 && !ref) {
1887 packet_flush(fd[1]);
1888 die(_("no matching remote head"));
1889 }
1890 if (version == protocol_v2) {
1891 if (shallow->nr)
1892 BUG("Protocol V2 does not provide shallows at this point in the fetch");
1893 memset(&si, 0, sizeof(si));
1894 ref_cpy = do_fetch_pack_v2(args, fd, ref, sought, nr_sought,
1895 &shallows_scratch, &si,
1896 pack_lockfiles);
1897 } else {
1898 prepare_shallow_info(&si, shallow);
1899 ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought,
1900 &si, pack_lockfiles);
1901 }
1902 reprepare_packed_git(the_repository);
1903
1904 if (!args->cloning && args->deepen) {
1905 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1906 struct ref *iterator = ref_cpy;
1907 opt.shallow_file = alternate_shallow_file;
1908 if (args->deepen)
1909 opt.is_deepening_fetch = 1;
1910 if (check_connected(iterate_ref_map, &iterator, &opt)) {
1911 error(_("remote did not send all necessary objects"));
1912 free_refs(ref_cpy);
1913 ref_cpy = NULL;
1914 rollback_shallow_file(the_repository, &shallow_lock);
1915 goto cleanup;
1916 }
1917 args->connectivity_checked = 1;
1918 }
1919
1920 update_shallow(args, sought, nr_sought, &si);
1921 cleanup:
1922 clear_shallow_info(&si);
1923 oid_array_clear(&shallows_scratch);
1924 return ref_cpy;
1925 }
1926
1927 int report_unmatched_refs(struct ref **sought, int nr_sought)
1928 {
1929 int i, ret = 0;
1930
1931 for (i = 0; i < nr_sought; i++) {
1932 if (!sought[i])
1933 continue;
1934 switch (sought[i]->match_status) {
1935 case REF_MATCHED:
1936 continue;
1937 case REF_NOT_MATCHED:
1938 error(_("no such remote ref %s"), sought[i]->name);
1939 break;
1940 case REF_UNADVERTISED_NOT_ALLOWED:
1941 error(_("Server does not allow request for unadvertised object %s"),
1942 sought[i]->name);
1943 break;
1944 }
1945 ret = 1;
1946 }
1947 return ret;
1948 }
git for Debian