?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge branch 'pb/doc-git-linkit-fix'
[git/debian.git] / fetch-pack.c
blob876f90c759a09334bb4a47575c236d27f2887b98
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 int advertise_sid;
39 static struct shallow_lock shallow_lock;
40 static const char *alternate_shallow_file;
41 static struct strbuf fsck_msg_types = STRBUF_INIT;
42 static struct string_list uri_protocols = STRING_LIST_INIT_DUP;
43
44 /* Remember to update object flag allocation in object.h */
45 #define COMPLETE (1U << 0)
46 #define ALTERNATE (1U << 1)
47
48 /*
49 * After sending this many "have"s if we do not get any new ACK , we
50 * give up traversing our history.
51 */
52 #define MAX_IN_VAIN 256
53
54 static int multi_ack, use_sideband;
55 /* Allow specifying sha1 if it is a ref tip. */
56 #define ALLOW_TIP_SHA1 01
57 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
58 #define ALLOW_REACHABLE_SHA1 02
59 static unsigned int allow_unadvertised_object_request;
60
61 __attribute__((format (printf, 2, 3)))
62 static inline void print_verbose(const struct fetch_pack_args *args,
63 const char *fmt, ...)
64 {
65 va_list params;
66
67 if (!args->verbose)
68 return;
69
70 va_start(params, fmt);
71 vfprintf(stderr, fmt, params);
72 va_end(params);
73 fputc('\n', stderr);
74 }
75
76 struct alternate_object_cache {
77 struct object **items;
78 size_t nr, alloc;
79 };
80
81 static void cache_one_alternate(const struct object_id *oid,
82 void *vcache)
83 {
84 struct alternate_object_cache *cache = vcache;
85 struct object *obj = parse_object(the_repository, oid);
86
87 if (!obj || (obj->flags & ALTERNATE))
88 return;
89
90 obj->flags |= ALTERNATE;
91 ALLOC_GROW(cache->items, cache->nr + 1, cache->alloc);
92 cache->items[cache->nr++] = obj;
93 }
94
95 static void for_each_cached_alternate(struct fetch_negotiator *negotiator,
96 void (*cb)(struct fetch_negotiator *,
97 struct object *))
98 {
99 static int initialized;
100 static struct alternate_object_cache cache;
101 size_t i;
102
103 if (!initialized) {
104 for_each_alternate_ref(cache_one_alternate, &cache);
105 initialized = 1;
106 }
107
108 for (i = 0; i < cache.nr; i++)
109 cb(negotiator, cache.items[i]);
110 }
111
112 static struct commit *deref_without_lazy_fetch(const struct object_id *oid,
113 int mark_tags_complete)
114 {
115 enum object_type type;
116 struct object_info info = { .typep = &type };
117
118 while (1) {
119 if (oid_object_info_extended(the_repository, oid, &info,
120 OBJECT_INFO_SKIP_FETCH_OBJECT | OBJECT_INFO_QUICK))
121 return NULL;
122 if (type == OBJ_TAG) {
123 struct tag *tag = (struct tag *)
124 parse_object(the_repository, oid);
125
126 if (!tag->tagged)
127 return NULL;
128 if (mark_tags_complete)
129 tag->object.flags |= COMPLETE;
130 oid = &tag->tagged->oid;
131 } else {
132 break;
133 }
134 }
135 if (type == OBJ_COMMIT)
136 return (struct commit *) parse_object(the_repository, oid);
137 return NULL;
138 }
139
140 static int rev_list_insert_ref(struct fetch_negotiator *negotiator,
141 const struct object_id *oid)
142 {
143 struct commit *c = deref_without_lazy_fetch(oid, 0);
144
145 if (c)
146 negotiator->add_tip(negotiator, c);
147 return 0;
148 }
149
150 static int rev_list_insert_ref_oid(const char *refname, const struct object_id *oid,
151 int flag, void *cb_data)
152 {
153 return rev_list_insert_ref(cb_data, oid);
154 }
155
156 enum ack_type {
157 NAK = 0,
158 ACK,
159 ACK_continue,
160 ACK_common,
161 ACK_ready
162 };
163
164 static void consume_shallow_list(struct fetch_pack_args *args,
165 struct packet_reader *reader)
166 {
167 if (args->stateless_rpc && args->deepen) {
168 /* If we sent a depth we will get back "duplicate"
169 * shallow and unshallow commands every time there
170 * is a block of have lines exchanged.
171 */
172 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
173 if (starts_with(reader->line, "shallow "))
174 continue;
175 if (starts_with(reader->line, "unshallow "))
176 continue;
177 die(_("git fetch-pack: expected shallow list"));
178 }
179 if (reader->status != PACKET_READ_FLUSH)
180 die(_("git fetch-pack: expected a flush packet after shallow list"));
181 }
182 }
183
184 static enum ack_type get_ack(struct packet_reader *reader,
185 struct object_id *result_oid)
186 {
187 int len;
188 const char *arg;
189
190 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
191 die(_("git fetch-pack: expected ACK/NAK, got a flush packet"));
192 len = reader->pktlen;
193
194 if (!strcmp(reader->line, "NAK"))
195 return NAK;
196 if (skip_prefix(reader->line, "ACK ", &arg)) {
197 const char *p;
198 if (!parse_oid_hex(arg, result_oid, &p)) {
199 len -= p - reader->line;
200 if (len < 1)
201 return ACK;
202 if (strstr(p, "continue"))
203 return ACK_continue;
204 if (strstr(p, "common"))
205 return ACK_common;
206 if (strstr(p, "ready"))
207 return ACK_ready;
208 return ACK;
209 }
210 }
211 die(_("git fetch-pack: expected ACK/NAK, got '%s'"), reader->line);
212 }
213
214 static void send_request(struct fetch_pack_args *args,
215 int fd, struct strbuf *buf)
216 {
217 if (args->stateless_rpc) {
218 send_sideband(fd, -1, buf->buf, buf->len, LARGE_PACKET_MAX);
219 packet_flush(fd);
220 } else {
221 if (write_in_full(fd, buf->buf, buf->len) < 0)
222 die_errno(_("unable to write to remote"));
223 }
224 }
225
226 static void insert_one_alternate_object(struct fetch_negotiator *negotiator,
227 struct object *obj)
228 {
229 rev_list_insert_ref(negotiator, &obj->oid);
230 }
231
232 #define INITIAL_FLUSH 16
233 #define PIPESAFE_FLUSH 32
234 #define LARGE_FLUSH 16384
235
236 static int next_flush(int stateless_rpc, int count)
237 {
238 if (stateless_rpc) {
239 if (count < LARGE_FLUSH)
240 count <<= 1;
241 else
242 count = count * 11 / 10;
243 } else {
244 if (count < PIPESAFE_FLUSH)
245 count <<= 1;
246 else
247 count += PIPESAFE_FLUSH;
248 }
249 return count;
250 }
251
252 static void mark_tips(struct fetch_negotiator *negotiator,
253 const struct oid_array *negotiation_tips)
254 {
255 int i;
256
257 if (!negotiation_tips) {
258 for_each_rawref(rev_list_insert_ref_oid, negotiator);
259 return;
260 }
261
262 for (i = 0; i < negotiation_tips->nr; i++)
263 rev_list_insert_ref(negotiator, &negotiation_tips->oid[i]);
264 return;
265 }
266
267 static int find_common(struct fetch_negotiator *negotiator,
268 struct fetch_pack_args *args,
269 int fd[2], struct object_id *result_oid,
270 struct ref *refs)
271 {
272 int fetching;
273 int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval;
274 const struct object_id *oid;
275 unsigned in_vain = 0;
276 int got_continue = 0;
277 int got_ready = 0;
278 struct strbuf req_buf = STRBUF_INIT;
279 size_t state_len = 0;
280 struct packet_reader reader;
281
282 if (args->stateless_rpc && multi_ack == 1)
283 die(_("--stateless-rpc requires multi_ack_detailed"));
284
285 packet_reader_init(&reader, fd[0], NULL, 0,
286 PACKET_READ_CHOMP_NEWLINE |
287 PACKET_READ_DIE_ON_ERR_PACKET);
288
289 mark_tips(negotiator, args->negotiation_tips);
290 for_each_cached_alternate(negotiator, insert_one_alternate_object);
291
292 fetching = 0;
293 for ( ; refs ; refs = refs->next) {
294 struct object_id *remote = &refs->old_oid;
295 const char *remote_hex;
296 struct object *o;
297
298 /*
299 * If that object is complete (i.e. it is an ancestor of a
300 * local ref), we tell them we have it but do not have to
301 * tell them about its ancestors, which they already know
302 * about.
303 *
304 * We use lookup_object here because we are only
305 * interested in the case we *know* the object is
306 * reachable and we have already scanned it.
307 */
308 if (((o = lookup_object(the_repository, remote)) != NULL) &&
309 (o->flags & COMPLETE)) {
310 continue;
311 }
312
313 remote_hex = oid_to_hex(remote);
314 if (!fetching) {
315 struct strbuf c = STRBUF_INIT;
316 if (multi_ack == 2) strbuf_addstr(&c, " multi_ack_detailed");
317 if (multi_ack == 1) strbuf_addstr(&c, " multi_ack");
318 if (no_done) strbuf_addstr(&c, " no-done");
319 if (use_sideband == 2) strbuf_addstr(&c, " side-band-64k");
320 if (use_sideband == 1) strbuf_addstr(&c, " side-band");
321 if (args->deepen_relative) strbuf_addstr(&c, " deepen-relative");
322 if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack");
323 if (args->no_progress) strbuf_addstr(&c, " no-progress");
324 if (args->include_tag) strbuf_addstr(&c, " include-tag");
325 if (prefer_ofs_delta) strbuf_addstr(&c, " ofs-delta");
326 if (deepen_since_ok) strbuf_addstr(&c, " deepen-since");
327 if (deepen_not_ok) strbuf_addstr(&c, " deepen-not");
328 if (agent_supported) strbuf_addf(&c, " agent=%s",
329 git_user_agent_sanitized());
330 if (advertise_sid)
331 strbuf_addf(&c, " session-id=%s", trace2_session_id());
332 if (args->filter_options.choice)
333 strbuf_addstr(&c, " filter");
334 packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
335 strbuf_release(&c);
336 } else
337 packet_buf_write(&req_buf, "want %s\n", remote_hex);
338 fetching++;
339 }
340
341 if (!fetching) {
342 strbuf_release(&req_buf);
343 packet_flush(fd[1]);
344 return 1;
345 }
346
347 if (is_repository_shallow(the_repository))
348 write_shallow_commits(&req_buf, 1, NULL);
349 if (args->depth > 0)
350 packet_buf_write(&req_buf, "deepen %d", args->depth);
351 if (args->deepen_since) {
352 timestamp_t max_age = approxidate(args->deepen_since);
353 packet_buf_write(&req_buf, "deepen-since %"PRItime, max_age);
354 }
355 if (args->deepen_not) {
356 int i;
357 for (i = 0; i < args->deepen_not->nr; i++) {
358 struct string_list_item *s = args->deepen_not->items + i;
359 packet_buf_write(&req_buf, "deepen-not %s", s->string);
360 }
361 }
362 if (server_supports_filtering && args->filter_options.choice) {
363 const char *spec =
364 expand_list_objects_filter_spec(&args->filter_options);
365 packet_buf_write(&req_buf, "filter %s", spec);
366 }
367 packet_buf_flush(&req_buf);
368 state_len = req_buf.len;
369
370 if (args->deepen) {
371 const char *arg;
372 struct object_id oid;
373
374 send_request(args, fd[1], &req_buf);
375 while (packet_reader_read(&reader) == PACKET_READ_NORMAL) {
376 if (skip_prefix(reader.line, "shallow ", &arg)) {
377 if (get_oid_hex(arg, &oid))
378 die(_("invalid shallow line: %s"), reader.line);
379 register_shallow(the_repository, &oid);
380 continue;
381 }
382 if (skip_prefix(reader.line, "unshallow ", &arg)) {
383 if (get_oid_hex(arg, &oid))
384 die(_("invalid unshallow line: %s"), reader.line);
385 if (!lookup_object(the_repository, &oid))
386 die(_("object not found: %s"), reader.line);
387 /* make sure that it is parsed as shallow */
388 if (!parse_object(the_repository, &oid))
389 die(_("error in object: %s"), reader.line);
390 if (unregister_shallow(&oid))
391 die(_("no shallow found: %s"), reader.line);
392 continue;
393 }
394 die(_("expected shallow/unshallow, got %s"), reader.line);
395 }
396 } else if (!args->stateless_rpc)
397 send_request(args, fd[1], &req_buf);
398
399 if (!args->stateless_rpc) {
400 /* If we aren't using the stateless-rpc interface
401 * we don't need to retain the headers.
402 */
403 strbuf_setlen(&req_buf, 0);
404 state_len = 0;
405 }
406
407 trace2_region_enter("fetch-pack", "negotiation_v0_v1", the_repository);
408 flushes = 0;
409 retval = -1;
410 while ((oid = negotiator->next(negotiator))) {
411 packet_buf_write(&req_buf, "have %s\n", oid_to_hex(oid));
412 print_verbose(args, "have %s", oid_to_hex(oid));
413 in_vain++;
414 if (flush_at <= ++count) {
415 int ack;
416
417 packet_buf_flush(&req_buf);
418 send_request(args, fd[1], &req_buf);
419 strbuf_setlen(&req_buf, state_len);
420 flushes++;
421 flush_at = next_flush(args->stateless_rpc, count);
422
423 /*
424 * We keep one window "ahead" of the other side, and
425 * will wait for an ACK only on the next one
426 */
427 if (!args->stateless_rpc && count == INITIAL_FLUSH)
428 continue;
429
430 consume_shallow_list(args, &reader);
431 do {
432 ack = get_ack(&reader, result_oid);
433 if (ack)
434 print_verbose(args, _("got %s %d %s"), "ack",
435 ack, oid_to_hex(result_oid));
436 switch (ack) {
437 case ACK:
438 flushes = 0;
439 multi_ack = 0;
440 retval = 0;
441 goto done;
442 case ACK_common:
443 case ACK_ready:
444 case ACK_continue: {
445 struct commit *commit =
446 lookup_commit(the_repository,
447 result_oid);
448 int was_common;
449
450 if (!commit)
451 die(_("invalid commit %s"), oid_to_hex(result_oid));
452 was_common = negotiator->ack(negotiator, commit);
453 if (args->stateless_rpc
454 && ack == ACK_common
455 && !was_common) {
456 /* We need to replay the have for this object
457 * on the next RPC request so the peer knows
458 * it is in common with us.
459 */
460 const char *hex = oid_to_hex(result_oid);
461 packet_buf_write(&req_buf, "have %s\n", hex);
462 state_len = req_buf.len;
463 /*
464 * Reset in_vain because an ack
465 * for this commit has not been
466 * seen.
467 */
468 in_vain = 0;
469 } else if (!args->stateless_rpc
470 || ack != ACK_common)
471 in_vain = 0;
472 retval = 0;
473 got_continue = 1;
474 if (ack == ACK_ready)
475 got_ready = 1;
476 break;
477 }
478 }
479 } while (ack);
480 flushes--;
481 if (got_continue && MAX_IN_VAIN < in_vain) {
482 print_verbose(args, _("giving up"));
483 break; /* give up */
484 }
485 if (got_ready)
486 break;
487 }
488 }
489 done:
490 trace2_region_leave("fetch-pack", "negotiation_v0_v1", the_repository);
491 if (!got_ready || !no_done) {
492 packet_buf_write(&req_buf, "done\n");
493 send_request(args, fd[1], &req_buf);
494 }
495 print_verbose(args, _("done"));
496 if (retval != 0) {
497 multi_ack = 0;
498 flushes++;
499 }
500 strbuf_release(&req_buf);
501
502 if (!got_ready || !no_done)
503 consume_shallow_list(args, &reader);
504 while (flushes || multi_ack) {
505 int ack = get_ack(&reader, result_oid);
506 if (ack) {
507 print_verbose(args, _("got %s (%d) %s"), "ack",
508 ack, oid_to_hex(result_oid));
509 if (ack == ACK)
510 return 0;
511 multi_ack = 1;
512 continue;
513 }
514 flushes--;
515 }
516 /* it is no error to fetch into a completely empty repo */
517 return count ? retval : 0;
518 }
519
520 static struct commit_list *complete;
521
522 static int mark_complete(const struct object_id *oid)
523 {
524 struct commit *commit = deref_without_lazy_fetch(oid, 1);
525
526 if (commit && !(commit->object.flags & COMPLETE)) {
527 commit->object.flags |= COMPLETE;
528 commit_list_insert(commit, &complete);
529 }
530 return 0;
531 }
532
533 static int mark_complete_oid(const char *refname, const struct object_id *oid,
534 int flag, void *cb_data)
535 {
536 return mark_complete(oid);
537 }
538
539 static void mark_recent_complete_commits(struct fetch_pack_args *args,
540 timestamp_t cutoff)
541 {
542 while (complete && cutoff <= complete->item->date) {
543 print_verbose(args, _("Marking %s as complete"),
544 oid_to_hex(&complete->item->object.oid));
545 pop_most_recent_commit(&complete, COMPLETE);
546 }
547 }
548
549 static void add_refs_to_oidset(struct oidset *oids, struct ref *refs)
550 {
551 for (; refs; refs = refs->next)
552 oidset_insert(oids, &refs->old_oid);
553 }
554
555 static int is_unmatched_ref(const struct ref *ref)
556 {
557 struct object_id oid;
558 const char *p;
559 return ref->match_status == REF_NOT_MATCHED &&
560 !parse_oid_hex(ref->name, &oid, &p) &&
561 *p == '\0' &&
562 oideq(&oid, &ref->old_oid);
563 }
564
565 static void filter_refs(struct fetch_pack_args *args,
566 struct ref **refs,
567 struct ref **sought, int nr_sought)
568 {
569 struct ref *newlist = NULL;
570 struct ref **newtail = &newlist;
571 struct ref *unmatched = NULL;
572 struct ref *ref, *next;
573 struct oidset tip_oids = OIDSET_INIT;
574 int i;
575 int strict = !(allow_unadvertised_object_request &
576 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
577
578 i = 0;
579 for (ref = *refs; ref; ref = next) {
580 int keep = 0;
581 next = ref->next;
582
583 if (starts_with(ref->name, "refs/") &&
584 check_refname_format(ref->name, 0)) {
585 /*
586 * trash or a peeled value; do not even add it to
587 * unmatched list
588 */
589 free_one_ref(ref);
590 continue;
591 } else {
592 while (i < nr_sought) {
593 int cmp = strcmp(ref->name, sought[i]->name);
594 if (cmp < 0)
595 break; /* definitely do not have it */
596 else if (cmp == 0) {
597 keep = 1; /* definitely have it */
598 sought[i]->match_status = REF_MATCHED;
599 }
600 i++;
601 }
602
603 if (!keep && args->fetch_all &&
604 (!args->deepen || !starts_with(ref->name, "refs/tags/")))
605 keep = 1;
606 }
607
608 if (keep) {
609 *newtail = ref;
610 ref->next = NULL;
611 newtail = &ref->next;
612 } else {
613 ref->next = unmatched;
614 unmatched = ref;
615 }
616 }
617
618 if (strict) {
619 for (i = 0; i < nr_sought; i++) {
620 ref = sought[i];
621 if (!is_unmatched_ref(ref))
622 continue;
623
624 add_refs_to_oidset(&tip_oids, unmatched);
625 add_refs_to_oidset(&tip_oids, newlist);
626 break;
627 }
628 }
629
630 /* Append unmatched requests to the list */
631 for (i = 0; i < nr_sought; i++) {
632 ref = sought[i];
633 if (!is_unmatched_ref(ref))
634 continue;
635
636 if (!strict || oidset_contains(&tip_oids, &ref->old_oid)) {
637 ref->match_status = REF_MATCHED;
638 *newtail = copy_ref(ref);
639 newtail = &(*newtail)->next;
640 } else {
641 ref->match_status = REF_UNADVERTISED_NOT_ALLOWED;
642 }
643 }
644
645 oidset_clear(&tip_oids);
646 free_refs(unmatched);
647
648 *refs = newlist;
649 }
650
651 static void mark_alternate_complete(struct fetch_negotiator *unused,
652 struct object *obj)
653 {
654 mark_complete(&obj->oid);
655 }
656
657 struct loose_object_iter {
658 struct oidset *loose_object_set;
659 struct ref *refs;
660 };
661
662 /*
663 * Mark recent commits available locally and reachable from a local ref as
664 * COMPLETE.
665 *
666 * The cutoff time for recency is determined by this heuristic: it is the
667 * earliest commit time of the objects in refs that are commits and that we know
668 * the commit time of.
669 */
670 static void mark_complete_and_common_ref(struct fetch_negotiator *negotiator,
671 struct fetch_pack_args *args,
672 struct ref **refs)
673 {
674 struct ref *ref;
675 int old_save_commit_buffer = save_commit_buffer;
676 timestamp_t cutoff = 0;
677
678 save_commit_buffer = 0;
679
680 trace2_region_enter("fetch-pack", "parse_remote_refs_and_find_cutoff", NULL);
681 for (ref = *refs; ref; ref = ref->next) {
682 struct object *o;
683
684 if (!has_object_file_with_flags(&ref->old_oid,
685 OBJECT_INFO_QUICK |
686 OBJECT_INFO_SKIP_FETCH_OBJECT))
687 continue;
688 o = parse_object(the_repository, &ref->old_oid);
689 if (!o)
690 continue;
691
692 /*
693 * We already have it -- which may mean that we were
694 * in sync with the other side at some time after
695 * that (it is OK if we guess wrong here).
696 */
697 if (o->type == OBJ_COMMIT) {
698 struct commit *commit = (struct commit *)o;
699 if (!cutoff || cutoff < commit->date)
700 cutoff = commit->date;
701 }
702 }
703 trace2_region_leave("fetch-pack", "parse_remote_refs_and_find_cutoff", NULL);
704
705 /*
706 * This block marks all local refs as COMPLETE, and then recursively marks all
707 * parents of those refs as COMPLETE.
708 */
709 trace2_region_enter("fetch-pack", "mark_complete_local_refs", NULL);
710 if (!args->deepen) {
711 for_each_rawref(mark_complete_oid, NULL);
712 for_each_cached_alternate(NULL, mark_alternate_complete);
713 commit_list_sort_by_date(&complete);
714 if (cutoff)
715 mark_recent_complete_commits(args, cutoff);
716 }
717 trace2_region_leave("fetch-pack", "mark_complete_local_refs", NULL);
718
719 /*
720 * Mark all complete remote refs as common refs.
721 * Don't mark them common yet; the server has to be told so first.
722 */
723 trace2_region_enter("fetch-pack", "mark_common_remote_refs", NULL);
724 for (ref = *refs; ref; ref = ref->next) {
725 struct commit *c = deref_without_lazy_fetch(&ref->old_oid, 0);
726
727 if (!c || !(c->object.flags & COMPLETE))
728 continue;
729
730 negotiator->known_common(negotiator, c);
731 }
732 trace2_region_leave("fetch-pack", "mark_common_remote_refs", NULL);
733
734 save_commit_buffer = old_save_commit_buffer;
735 }
736
737 /*
738 * Returns 1 if every object pointed to by the given remote refs is available
739 * locally and reachable from a local ref, and 0 otherwise.
740 */
741 static int everything_local(struct fetch_pack_args *args,
742 struct ref **refs)
743 {
744 struct ref *ref;
745 int retval;
746
747 for (retval = 1, ref = *refs; ref ; ref = ref->next) {
748 const struct object_id *remote = &ref->old_oid;
749 struct object *o;
750
751 o = lookup_object(the_repository, remote);
752 if (!o || !(o->flags & COMPLETE)) {
753 retval = 0;
754 print_verbose(args, "want %s (%s)", oid_to_hex(remote),
755 ref->name);
756 continue;
757 }
758 print_verbose(args, _("already have %s (%s)"), oid_to_hex(remote),
759 ref->name);
760 }
761
762 return retval;
763 }
764
765 static int sideband_demux(int in, int out, void *data)
766 {
767 int *xd = data;
768 int ret;
769
770 ret = recv_sideband("fetch-pack", xd[0], out);
771 close(out);
772 return ret;
773 }
774
775 static void write_promisor_file(const char *keep_name,
776 struct ref **sought, int nr_sought)
777 {
778 struct strbuf promisor_name = STRBUF_INIT;
779 int suffix_stripped;
780 FILE *output;
781 int i;
782
783 strbuf_addstr(&promisor_name, keep_name);
784 suffix_stripped = strbuf_strip_suffix(&promisor_name, ".keep");
785 if (!suffix_stripped)
786 BUG("name of pack lockfile should end with .keep (was '%s')",
787 keep_name);
788 strbuf_addstr(&promisor_name, ".promisor");
789
790 output = xfopen(promisor_name.buf, "w");
791 for (i = 0; i < nr_sought; i++)
792 fprintf(output, "%s %s\n", oid_to_hex(&sought[i]->old_oid),
793 sought[i]->name);
794 fclose(output);
795
796 strbuf_release(&promisor_name);
797 }
798
799 /*
800 * Pass 1 as "only_packfile" if the pack received is the only pack in this
801 * fetch request (that is, if there were no packfile URIs provided).
802 */
803 static int get_pack(struct fetch_pack_args *args,
804 int xd[2], struct string_list *pack_lockfiles,
805 int only_packfile,
806 struct ref **sought, int nr_sought)
807 {
808 struct async demux;
809 int do_keep = args->keep_pack;
810 const char *cmd_name;
811 struct pack_header header;
812 int pass_header = 0;
813 struct child_process cmd = CHILD_PROCESS_INIT;
814 int ret;
815
816 memset(&demux, 0, sizeof(demux));
817 if (use_sideband) {
818 /* xd[] is talking with upload-pack; subprocess reads from
819 * xd[0], spits out band#2 to stderr, and feeds us band#1
820 * through demux->out.
821 */
822 demux.proc = sideband_demux;
823 demux.data = xd;
824 demux.out = -1;
825 demux.isolate_sigpipe = 1;
826 if (start_async(&demux))
827 die(_("fetch-pack: unable to fork off sideband demultiplexer"));
828 }
829 else
830 demux.out = xd[0];
831
832 if (!args->keep_pack && unpack_limit) {
833
834 if (read_pack_header(demux.out, &header))
835 die(_("protocol error: bad pack header"));
836 pass_header = 1;
837 if (ntohl(header.hdr_entries) < unpack_limit)
838 do_keep = 0;
839 else
840 do_keep = 1;
841 }
842
843 if (alternate_shallow_file) {
844 strvec_push(&cmd.args, "--shallow-file");
845 strvec_push(&cmd.args, alternate_shallow_file);
846 }
847
848 if (do_keep || args->from_promisor) {
849 if (pack_lockfiles)
850 cmd.out = -1;
851 cmd_name = "index-pack";
852 strvec_push(&cmd.args, cmd_name);
853 strvec_push(&cmd.args, "--stdin");
854 if (!args->quiet && !args->no_progress)
855 strvec_push(&cmd.args, "-v");
856 if (args->use_thin_pack)
857 strvec_push(&cmd.args, "--fix-thin");
858 if (do_keep && (args->lock_pack || unpack_limit)) {
859 char hostname[HOST_NAME_MAX + 1];
860 if (xgethostname(hostname, sizeof(hostname)))
861 xsnprintf(hostname, sizeof(hostname), "localhost");
862 strvec_pushf(&cmd.args,
863 "--keep=fetch-pack %"PRIuMAX " on %s",
864 (uintmax_t)getpid(), hostname);
865 }
866 if (only_packfile && args->check_self_contained_and_connected)
867 strvec_push(&cmd.args, "--check-self-contained-and-connected");
868 else
869 /*
870 * We cannot perform any connectivity checks because
871 * not all packs have been downloaded; let the caller
872 * have this responsibility.
873 */
874 args->check_self_contained_and_connected = 0;
875
876 if (args->from_promisor)
877 /*
878 * write_promisor_file() may be called afterwards but
879 * we still need index-pack to know that this is a
880 * promisor pack. For example, if transfer.fsckobjects
881 * is true, index-pack needs to know that .gitmodules
882 * is a promisor object (so that it won't complain if
883 * it is missing).
884 */
885 strvec_push(&cmd.args, "--promisor");
886 }
887 else {
888 cmd_name = "unpack-objects";
889 strvec_push(&cmd.args, cmd_name);
890 if (args->quiet || args->no_progress)
891 strvec_push(&cmd.args, "-q");
892 args->check_self_contained_and_connected = 0;
893 }
894
895 if (pass_header)
896 strvec_pushf(&cmd.args, "--pack_header=%"PRIu32",%"PRIu32,
897 ntohl(header.hdr_version),
898 ntohl(header.hdr_entries));
899 if (fetch_fsck_objects >= 0
900 ? fetch_fsck_objects
901 : transfer_fsck_objects >= 0
902 ? transfer_fsck_objects
903 : 0) {
904 if (args->from_promisor || !only_packfile)
905 /*
906 * We cannot use --strict in index-pack because it
907 * checks both broken objects and links, but we only
908 * want to check for broken objects.
909 */
910 strvec_push(&cmd.args, "--fsck-objects");
911 else
912 strvec_pushf(&cmd.args, "--strict%s",
913 fsck_msg_types.buf);
914 }
915
916 cmd.in = demux.out;
917 cmd.git_cmd = 1;
918 if (start_command(&cmd))
919 die(_("fetch-pack: unable to fork off %s"), cmd_name);
920 if (do_keep && pack_lockfiles) {
921 char *pack_lockfile = index_pack_lockfile(cmd.out);
922 if (pack_lockfile)
923 string_list_append_nodup(pack_lockfiles, pack_lockfile);
924 close(cmd.out);
925 }
926
927 if (!use_sideband)
928 /* Closed by start_command() */
929 xd[0] = -1;
930
931 ret = finish_command(&cmd);
932 if (!ret || (args->check_self_contained_and_connected && ret == 1))
933 args->self_contained_and_connected =
934 args->check_self_contained_and_connected &&
935 ret == 0;
936 else
937 die(_("%s failed"), cmd_name);
938 if (use_sideband && finish_async(&demux))
939 die(_("error in sideband demultiplexer"));
940
941 /*
942 * Now that index-pack has succeeded, write the promisor file using the
943 * obtained .keep filename if necessary
944 */
945 if (do_keep && pack_lockfiles && pack_lockfiles->nr && args->from_promisor)
946 write_promisor_file(pack_lockfiles->items[0].string, sought, nr_sought);
947
948 return 0;
949 }
950
951 static int cmp_ref_by_name(const void *a_, const void *b_)
952 {
953 const struct ref *a = *((const struct ref **)a_);
954 const struct ref *b = *((const struct ref **)b_);
955 return strcmp(a->name, b->name);
956 }
957
958 static struct ref *do_fetch_pack(struct fetch_pack_args *args,
959 int fd[2],
960 const struct ref *orig_ref,
961 struct ref **sought, int nr_sought,
962 struct shallow_info *si,
963 struct string_list *pack_lockfiles)
964 {
965 struct repository *r = the_repository;
966 struct ref *ref = copy_ref_list(orig_ref);
967 struct object_id oid;
968 const char *agent_feature;
969 int agent_len;
970 struct fetch_negotiator negotiator_alloc;
971 struct fetch_negotiator *negotiator;
972
973 negotiator = &negotiator_alloc;
974 fetch_negotiator_init(r, negotiator);
975
976 sort_ref_list(&ref, ref_compare_name);
977 QSORT(sought, nr_sought, cmp_ref_by_name);
978
979 if ((agent_feature = server_feature_value("agent", &agent_len))) {
980 agent_supported = 1;
981 if (agent_len)
982 print_verbose(args, _("Server version is %.*s"),
983 agent_len, agent_feature);
984 }
985
986 if (!server_supports("session-id"))
987 advertise_sid = 0;
988
989 if (server_supports("shallow"))
990 print_verbose(args, _("Server supports %s"), "shallow");
991 else if (args->depth > 0 || is_repository_shallow(r))
992 die(_("Server does not support shallow clients"));
993 if (args->depth > 0 || args->deepen_since || args->deepen_not)
994 args->deepen = 1;
995 if (server_supports("multi_ack_detailed")) {
996 print_verbose(args, _("Server supports %s"), "multi_ack_detailed");
997 multi_ack = 2;
998 if (server_supports("no-done")) {
999 print_verbose(args, _("Server supports %s"), "no-done");
1000 if (args->stateless_rpc)
1001 no_done = 1;
1002 }
1003 }
1004 else if (server_supports("multi_ack")) {
1005 print_verbose(args, _("Server supports %s"), "multi_ack");
1006 multi_ack = 1;
1007 }
1008 if (server_supports("side-band-64k")) {
1009 print_verbose(args, _("Server supports %s"), "side-band-64k");
1010 use_sideband = 2;
1011 }
1012 else if (server_supports("side-band")) {
1013 print_verbose(args, _("Server supports %s"), "side-band");
1014 use_sideband = 1;
1015 }
1016 if (server_supports("allow-tip-sha1-in-want")) {
1017 print_verbose(args, _("Server supports %s"), "allow-tip-sha1-in-want");
1018 allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1019 }
1020 if (server_supports("allow-reachable-sha1-in-want")) {
1021 print_verbose(args, _("Server supports %s"), "allow-reachable-sha1-in-want");
1022 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1023 }
1024 if (server_supports("thin-pack"))
1025 print_verbose(args, _("Server supports %s"), "thin-pack");
1026 else
1027 args->use_thin_pack = 0;
1028 if (server_supports("no-progress"))
1029 print_verbose(args, _("Server supports %s"), "no-progress");
1030 else
1031 args->no_progress = 0;
1032 if (server_supports("include-tag"))
1033 print_verbose(args, _("Server supports %s"), "include-tag");
1034 else
1035 args->include_tag = 0;
1036 if (server_supports("ofs-delta"))
1037 print_verbose(args, _("Server supports %s"), "ofs-delta");
1038 else
1039 prefer_ofs_delta = 0;
1040
1041 if (server_supports("filter")) {
1042 server_supports_filtering = 1;
1043 print_verbose(args, _("Server supports %s"), "filter");
1044 } else if (args->filter_options.choice) {
1045 warning("filtering not recognized by server, ignoring");
1046 }
1047
1048 if (server_supports("deepen-since")) {
1049 print_verbose(args, _("Server supports %s"), "deepen-since");
1050 deepen_since_ok = 1;
1051 } else if (args->deepen_since)
1052 die(_("Server does not support --shallow-since"));
1053 if (server_supports("deepen-not")) {
1054 print_verbose(args, _("Server supports %s"), "deepen-not");
1055 deepen_not_ok = 1;
1056 } else if (args->deepen_not)
1057 die(_("Server does not support --shallow-exclude"));
1058 if (server_supports("deepen-relative"))
1059 print_verbose(args, _("Server supports %s"), "deepen-relative");
1060 else if (args->deepen_relative)
1061 die(_("Server does not support --deepen"));
1062 if (!server_supports_hash(the_hash_algo->name, NULL))
1063 die(_("Server does not support this repository's object format"));
1064
1065 mark_complete_and_common_ref(negotiator, args, &ref);
1066 filter_refs(args, &ref, sought, nr_sought);
1067 if (everything_local(args, &ref)) {
1068 packet_flush(fd[1]);
1069 goto all_done;
1070 }
1071 if (find_common(negotiator, args, fd, &oid, ref) < 0)
1072 if (!args->keep_pack)
1073 /* When cloning, it is not unusual to have
1074 * no common commit.
1075 */
1076 warning(_("no common commits"));
1077
1078 if (args->stateless_rpc)
1079 packet_flush(fd[1]);
1080 if (args->deepen)
1081 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
1082 NULL);
1083 else if (si->nr_ours || si->nr_theirs)
1084 alternate_shallow_file = setup_temporary_shallow(si->shallow);
1085 else
1086 alternate_shallow_file = NULL;
1087 if (get_pack(args, fd, pack_lockfiles, 1, sought, nr_sought))
1088 die(_("git fetch-pack: fetch failed."));
1089
1090 all_done:
1091 if (negotiator)
1092 negotiator->release(negotiator);
1093 return ref;
1094 }
1095
1096 static void add_shallow_requests(struct strbuf *req_buf,
1097 const struct fetch_pack_args *args)
1098 {
1099 if (is_repository_shallow(the_repository))
1100 write_shallow_commits(req_buf, 1, NULL);
1101 if (args->depth > 0)
1102 packet_buf_write(req_buf, "deepen %d", args->depth);
1103 if (args->deepen_since) {
1104 timestamp_t max_age = approxidate(args->deepen_since);
1105 packet_buf_write(req_buf, "deepen-since %"PRItime, max_age);
1106 }
1107 if (args->deepen_not) {
1108 int i;
1109 for (i = 0; i < args->deepen_not->nr; i++) {
1110 struct string_list_item *s = args->deepen_not->items + i;
1111 packet_buf_write(req_buf, "deepen-not %s", s->string);
1112 }
1113 }
1114 if (args->deepen_relative)
1115 packet_buf_write(req_buf, "deepen-relative\n");
1116 }
1117
1118 static void add_wants(const struct ref *wants, struct strbuf *req_buf)
1119 {
1120 int use_ref_in_want = server_supports_feature("fetch", "ref-in-want", 0);
1121
1122 for ( ; wants ; wants = wants->next) {
1123 const struct object_id *remote = &wants->old_oid;
1124 struct object *o;
1125
1126 /*
1127 * If that object is complete (i.e. it is an ancestor of a
1128 * local ref), we tell them we have it but do not have to
1129 * tell them about its ancestors, which they already know
1130 * about.
1131 *
1132 * We use lookup_object here because we are only
1133 * interested in the case we *know* the object is
1134 * reachable and we have already scanned it.
1135 */
1136 if (((o = lookup_object(the_repository, remote)) != NULL) &&
1137 (o->flags & COMPLETE)) {
1138 continue;
1139 }
1140
1141 if (!use_ref_in_want || wants->exact_oid)
1142 packet_buf_write(req_buf, "want %s\n", oid_to_hex(remote));
1143 else
1144 packet_buf_write(req_buf, "want-ref %s\n", wants->name);
1145 }
1146 }
1147
1148 static void add_common(struct strbuf *req_buf, struct oidset *common)
1149 {
1150 struct oidset_iter iter;
1151 const struct object_id *oid;
1152 oidset_iter_init(common, &iter);
1153
1154 while ((oid = oidset_iter_next(&iter))) {
1155 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1156 }
1157 }
1158
1159 static int add_haves(struct fetch_negotiator *negotiator,
1160 int seen_ack,
1161 struct strbuf *req_buf,
1162 int *haves_to_send, int *in_vain)
1163 {
1164 int ret = 0;
1165 int haves_added = 0;
1166 const struct object_id *oid;
1167
1168 while ((oid = negotiator->next(negotiator))) {
1169 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1170 if (++haves_added >= *haves_to_send)
1171 break;
1172 }
1173
1174 *in_vain += haves_added;
1175 if (!haves_added || (seen_ack && *in_vain >= MAX_IN_VAIN)) {
1176 /* Send Done */
1177 packet_buf_write(req_buf, "done\n");
1178 ret = 1;
1179 }
1180
1181 /* Increase haves to send on next round */
1182 *haves_to_send = next_flush(1, *haves_to_send);
1183
1184 return ret;
1185 }
1186
1187 static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out,
1188 struct fetch_pack_args *args,
1189 const struct ref *wants, struct oidset *common,
1190 int *haves_to_send, int *in_vain,
1191 int sideband_all, int seen_ack)
1192 {
1193 int ret = 0;
1194 const char *hash_name;
1195 struct strbuf req_buf = STRBUF_INIT;
1196
1197 if (server_supports_v2("fetch", 1))
1198 packet_buf_write(&req_buf, "command=fetch");
1199 if (server_supports_v2("agent", 0))
1200 packet_buf_write(&req_buf, "agent=%s", git_user_agent_sanitized());
1201 if (advertise_sid && server_supports_v2("session-id", 0))
1202 packet_buf_write(&req_buf, "session-id=%s", trace2_session_id());
1203 if (args->server_options && args->server_options->nr &&
1204 server_supports_v2("server-option", 1)) {
1205 int i;
1206 for (i = 0; i < args->server_options->nr; i++)
1207 packet_buf_write(&req_buf, "server-option=%s",
1208 args->server_options->items[i].string);
1209 }
1210
1211 if (server_feature_v2("object-format", &hash_name)) {
1212 int hash_algo = hash_algo_by_name(hash_name);
1213 if (hash_algo_by_ptr(the_hash_algo) != hash_algo)
1214 die(_("mismatched algorithms: client %s; server %s"),
1215 the_hash_algo->name, hash_name);
1216 packet_write_fmt(fd_out, "object-format=%s", the_hash_algo->name);
1217 } else if (hash_algo_by_ptr(the_hash_algo) != GIT_HASH_SHA1) {
1218 die(_("the server does not support algorithm '%s'"),
1219 the_hash_algo->name);
1220 }
1221
1222 packet_buf_delim(&req_buf);
1223 if (args->use_thin_pack)
1224 packet_buf_write(&req_buf, "thin-pack");
1225 if (args->no_progress)
1226 packet_buf_write(&req_buf, "no-progress");
1227 if (args->include_tag)
1228 packet_buf_write(&req_buf, "include-tag");
1229 if (prefer_ofs_delta)
1230 packet_buf_write(&req_buf, "ofs-delta");
1231 if (sideband_all)
1232 packet_buf_write(&req_buf, "sideband-all");
1233
1234 /* Add shallow-info and deepen request */
1235 if (server_supports_feature("fetch", "shallow", 0))
1236 add_shallow_requests(&req_buf, args);
1237 else if (is_repository_shallow(the_repository) || args->deepen)
1238 die(_("Server does not support shallow requests"));
1239
1240 /* Add filter */
1241 if (server_supports_feature("fetch", "filter", 0) &&
1242 args->filter_options.choice) {
1243 const char *spec =
1244 expand_list_objects_filter_spec(&args->filter_options);
1245 print_verbose(args, _("Server supports filter"));
1246 packet_buf_write(&req_buf, "filter %s", spec);
1247 } else if (args->filter_options.choice) {
1248 warning("filtering not recognized by server, ignoring");
1249 }
1250
1251 if (server_supports_feature("fetch", "packfile-uris", 0)) {
1252 int i;
1253 struct strbuf to_send = STRBUF_INIT;
1254
1255 for (i = 0; i < uri_protocols.nr; i++) {
1256 const char *s = uri_protocols.items[i].string;
1257
1258 if (!strcmp(s, "https") || !strcmp(s, "http")) {
1259 if (to_send.len)
1260 strbuf_addch(&to_send, ',');
1261 strbuf_addstr(&to_send, s);
1262 }
1263 }
1264 if (to_send.len) {
1265 packet_buf_write(&req_buf, "packfile-uris %s",
1266 to_send.buf);
1267 strbuf_release(&to_send);
1268 }
1269 }
1270
1271 /* add wants */
1272 add_wants(wants, &req_buf);
1273
1274 /* Add all of the common commits we've found in previous rounds */
1275 add_common(&req_buf, common);
1276
1277 /* Add initial haves */
1278 ret = add_haves(negotiator, seen_ack, &req_buf,
1279 haves_to_send, in_vain);
1280
1281 /* Send request */
1282 packet_buf_flush(&req_buf);
1283 if (write_in_full(fd_out, req_buf.buf, req_buf.len) < 0)
1284 die_errno(_("unable to write request to remote"));
1285
1286 strbuf_release(&req_buf);
1287 return ret;
1288 }
1289
1290 /*
1291 * Processes a section header in a server's response and checks if it matches
1292 * `section`. If the value of `peek` is 1, the header line will be peeked (and
1293 * not consumed); if 0, the line will be consumed and the function will die if
1294 * the section header doesn't match what was expected.
1295 */
1296 static int process_section_header(struct packet_reader *reader,
1297 const char *section, int peek)
1298 {
1299 int ret;
1300
1301 if (packet_reader_peek(reader) != PACKET_READ_NORMAL)
1302 die(_("error reading section header '%s'"), section);
1303
1304 ret = !strcmp(reader->line, section);
1305
1306 if (!peek) {
1307 if (!ret)
1308 die(_("expected '%s', received '%s'"),
1309 section, reader->line);
1310 packet_reader_read(reader);
1311 }
1312
1313 return ret;
1314 }
1315
1316 enum common_found {
1317 /*
1318 * No commit was found to be possessed by both the client and the
1319 * server, and "ready" was not received.
1320 */
1321 NO_COMMON_FOUND,
1322
1323 /*
1324 * At least one commit was found to be possessed by both the client and
1325 * the server, and "ready" was not received.
1326 */
1327 COMMON_FOUND,
1328
1329 /*
1330 * "ready" was received, indicating that the server is ready to send
1331 * the packfile without any further negotiation.
1332 */
1333 READY
1334 };
1335
1336 static enum common_found process_acks(struct fetch_negotiator *negotiator,
1337 struct packet_reader *reader,
1338 struct oidset *common)
1339 {
1340 /* received */
1341 int received_ready = 0;
1342 int received_ack = 0;
1343
1344 process_section_header(reader, "acknowledgments", 0);
1345 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1346 const char *arg;
1347
1348 if (!strcmp(reader->line, "NAK"))
1349 continue;
1350
1351 if (skip_prefix(reader->line, "ACK ", &arg)) {
1352 struct object_id oid;
1353 received_ack = 1;
1354 if (!get_oid_hex(arg, &oid)) {
1355 struct commit *commit;
1356 oidset_insert(common, &oid);
1357 commit = lookup_commit(the_repository, &oid);
1358 if (negotiator)
1359 negotiator->ack(negotiator, commit);
1360 }
1361 continue;
1362 }
1363
1364 if (!strcmp(reader->line, "ready")) {
1365 received_ready = 1;
1366 continue;
1367 }
1368
1369 die(_("unexpected acknowledgment line: '%s'"), reader->line);
1370 }
1371
1372 if (reader->status != PACKET_READ_FLUSH &&
1373 reader->status != PACKET_READ_DELIM)
1374 die(_("error processing acks: %d"), reader->status);
1375
1376 /*
1377 * If an "acknowledgments" section is sent, a packfile is sent if and
1378 * only if "ready" was sent in this section. The other sections
1379 * ("shallow-info" and "wanted-refs") are sent only if a packfile is
1380 * sent. Therefore, a DELIM is expected if "ready" is sent, and a FLUSH
1381 * otherwise.
1382 */
1383 if (received_ready && reader->status != PACKET_READ_DELIM)
1384 die(_("expected packfile to be sent after 'ready'"));
1385 if (!received_ready && reader->status != PACKET_READ_FLUSH)
1386 die(_("expected no other sections to be sent after no 'ready'"));
1387
1388 return received_ready ? READY :
1389 (received_ack ? COMMON_FOUND : NO_COMMON_FOUND);
1390 }
1391
1392 static void receive_shallow_info(struct fetch_pack_args *args,
1393 struct packet_reader *reader,
1394 struct oid_array *shallows,
1395 struct shallow_info *si)
1396 {
1397 int unshallow_received = 0;
1398
1399 process_section_header(reader, "shallow-info", 0);
1400 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1401 const char *arg;
1402 struct object_id oid;
1403
1404 if (skip_prefix(reader->line, "shallow ", &arg)) {
1405 if (get_oid_hex(arg, &oid))
1406 die(_("invalid shallow line: %s"), reader->line);
1407 oid_array_append(shallows, &oid);
1408 continue;
1409 }
1410 if (skip_prefix(reader->line, "unshallow ", &arg)) {
1411 if (get_oid_hex(arg, &oid))
1412 die(_("invalid unshallow line: %s"), reader->line);
1413 if (!lookup_object(the_repository, &oid))
1414 die(_("object not found: %s"), reader->line);
1415 /* make sure that it is parsed as shallow */
1416 if (!parse_object(the_repository, &oid))
1417 die(_("error in object: %s"), reader->line);
1418 if (unregister_shallow(&oid))
1419 die(_("no shallow found: %s"), reader->line);
1420 unshallow_received = 1;
1421 continue;
1422 }
1423 die(_("expected shallow/unshallow, got %s"), reader->line);
1424 }
1425
1426 if (reader->status != PACKET_READ_FLUSH &&
1427 reader->status != PACKET_READ_DELIM)
1428 die(_("error processing shallow info: %d"), reader->status);
1429
1430 if (args->deepen || unshallow_received) {
1431 /*
1432 * Treat these as shallow lines caused by our depth settings.
1433 * In v0, these lines cannot cause refs to be rejected; do the
1434 * same.
1435 */
1436 int i;
1437
1438 for (i = 0; i < shallows->nr; i++)
1439 register_shallow(the_repository, &shallows->oid[i]);
1440 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
1441 NULL);
1442 args->deepen = 1;
1443 } else if (shallows->nr) {
1444 /*
1445 * Treat these as shallow lines caused by the remote being
1446 * shallow. In v0, remote refs that reach these objects are
1447 * rejected (unless --update-shallow is set); do the same.
1448 */
1449 prepare_shallow_info(si, shallows);
1450 if (si->nr_ours || si->nr_theirs)
1451 alternate_shallow_file =
1452 setup_temporary_shallow(si->shallow);
1453 else
1454 alternate_shallow_file = NULL;
1455 } else {
1456 alternate_shallow_file = NULL;
1457 }
1458 }
1459
1460 static int cmp_name_ref(const void *name, const void *ref)
1461 {
1462 return strcmp(name, (*(struct ref **)ref)->name);
1463 }
1464
1465 static void receive_wanted_refs(struct packet_reader *reader,
1466 struct ref **sought, int nr_sought)
1467 {
1468 process_section_header(reader, "wanted-refs", 0);
1469 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1470 struct object_id oid;
1471 const char *end;
1472 struct ref **found;
1473
1474 if (parse_oid_hex(reader->line, &oid, &end) || *end++ != ' ')
1475 die(_("expected wanted-ref, got '%s'"), reader->line);
1476
1477 found = bsearch(end, sought, nr_sought, sizeof(*sought),
1478 cmp_name_ref);
1479 if (!found)
1480 die(_("unexpected wanted-ref: '%s'"), reader->line);
1481 oidcpy(&(*found)->old_oid, &oid);
1482 }
1483
1484 if (reader->status != PACKET_READ_DELIM)
1485 die(_("error processing wanted refs: %d"), reader->status);
1486 }
1487
1488 static void receive_packfile_uris(struct packet_reader *reader,
1489 struct string_list *uris)
1490 {
1491 process_section_header(reader, "packfile-uris", 0);
1492 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1493 if (reader->pktlen < the_hash_algo->hexsz ||
1494 reader->line[the_hash_algo->hexsz] != ' ')
1495 die("expected '<hash> <uri>', got: %s\n", reader->line);
1496
1497 string_list_append(uris, reader->line);
1498 }
1499 if (reader->status != PACKET_READ_DELIM)
1500 die("expected DELIM");
1501 }
1502
1503 enum fetch_state {
1504 FETCH_CHECK_LOCAL = 0,
1505 FETCH_SEND_REQUEST,
1506 FETCH_PROCESS_ACKS,
1507 FETCH_GET_PACK,
1508 FETCH_DONE,
1509 };
1510
1511 static void do_check_stateless_delimiter(const struct fetch_pack_args *args,
1512 struct packet_reader *reader)
1513 {
1514 check_stateless_delimiter(args->stateless_rpc, reader,
1515 _("git fetch-pack: expected response end packet"));
1516 }
1517
1518 static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
1519 int fd[2],
1520 const struct ref *orig_ref,
1521 struct ref **sought, int nr_sought,
1522 struct oid_array *shallows,
1523 struct shallow_info *si,
1524 struct string_list *pack_lockfiles)
1525 {
1526 struct repository *r = the_repository;
1527 struct ref *ref = copy_ref_list(orig_ref);
1528 enum fetch_state state = FETCH_CHECK_LOCAL;
1529 struct oidset common = OIDSET_INIT;
1530 struct packet_reader reader;
1531 int in_vain = 0, negotiation_started = 0;
1532 int haves_to_send = INITIAL_FLUSH;
1533 struct fetch_negotiator negotiator_alloc;
1534 struct fetch_negotiator *negotiator;
1535 int seen_ack = 0;
1536 struct string_list packfile_uris = STRING_LIST_INIT_DUP;
1537 int i;
1538
1539 negotiator = &negotiator_alloc;
1540 fetch_negotiator_init(r, negotiator);
1541
1542 packet_reader_init(&reader, fd[0], NULL, 0,
1543 PACKET_READ_CHOMP_NEWLINE |
1544 PACKET_READ_DIE_ON_ERR_PACKET);
1545 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 1) &&
1546 server_supports_feature("fetch", "sideband-all", 0)) {
1547 reader.use_sideband = 1;
1548 reader.me = "fetch-pack";
1549 }
1550
1551 while (state != FETCH_DONE) {
1552 switch (state) {
1553 case FETCH_CHECK_LOCAL:
1554 sort_ref_list(&ref, ref_compare_name);
1555 QSORT(sought, nr_sought, cmp_ref_by_name);
1556
1557 /* v2 supports these by default */
1558 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1559 use_sideband = 2;
1560 if (args->depth > 0 || args->deepen_since || args->deepen_not)
1561 args->deepen = 1;
1562
1563 /* Filter 'ref' by 'sought' and those that aren't local */
1564 mark_complete_and_common_ref(negotiator, args, &ref);
1565 filter_refs(args, &ref, sought, nr_sought);
1566 if (everything_local(args, &ref))
1567 state = FETCH_DONE;
1568 else
1569 state = FETCH_SEND_REQUEST;
1570
1571 mark_tips(negotiator, args->negotiation_tips);
1572 for_each_cached_alternate(negotiator,
1573 insert_one_alternate_object);
1574 break;
1575 case FETCH_SEND_REQUEST:
1576 if (!negotiation_started) {
1577 negotiation_started = 1;
1578 trace2_region_enter("fetch-pack",
1579 "negotiation_v2",
1580 the_repository);
1581 }
1582 if (send_fetch_request(negotiator, fd[1], args, ref,
1583 &common,
1584 &haves_to_send, &in_vain,
1585 reader.use_sideband,
1586 seen_ack))
1587 state = FETCH_GET_PACK;
1588 else
1589 state = FETCH_PROCESS_ACKS;
1590 break;
1591 case FETCH_PROCESS_ACKS:
1592 /* Process ACKs/NAKs */
1593 switch (process_acks(negotiator, &reader, &common)) {
1594 case READY:
1595 /*
1596 * Don't check for response delimiter; get_pack() will
1597 * read the rest of this response.
1598 */
1599 state = FETCH_GET_PACK;
1600 break;
1601 case COMMON_FOUND:
1602 in_vain = 0;
1603 seen_ack = 1;
1604 /* fallthrough */
1605 case NO_COMMON_FOUND:
1606 do_check_stateless_delimiter(args, &reader);
1607 state = FETCH_SEND_REQUEST;
1608 break;
1609 }
1610 break;
1611 case FETCH_GET_PACK:
1612 trace2_region_leave("fetch-pack",
1613 "negotiation_v2",
1614 the_repository);
1615 /* Check for shallow-info section */
1616 if (process_section_header(&reader, "shallow-info", 1))
1617 receive_shallow_info(args, &reader, shallows, si);
1618
1619 if (process_section_header(&reader, "wanted-refs", 1))
1620 receive_wanted_refs(&reader, sought, nr_sought);
1621
1622 /* get the pack(s) */
1623 if (process_section_header(&reader, "packfile-uris", 1))
1624 receive_packfile_uris(&reader, &packfile_uris);
1625 process_section_header(&reader, "packfile", 0);
1626 if (get_pack(args, fd, pack_lockfiles,
1627 !packfile_uris.nr, sought, nr_sought))
1628 die(_("git fetch-pack: fetch failed."));
1629 do_check_stateless_delimiter(args, &reader);
1630
1631 state = FETCH_DONE;
1632 break;
1633 case FETCH_DONE:
1634 continue;
1635 }
1636 }
1637
1638 for (i = 0; i < packfile_uris.nr; i++) {
1639 struct child_process cmd = CHILD_PROCESS_INIT;
1640 char packname[GIT_MAX_HEXSZ + 1];
1641 const char *uri = packfile_uris.items[i].string +
1642 the_hash_algo->hexsz + 1;
1643
1644 strvec_push(&cmd.args, "http-fetch");
1645 strvec_pushf(&cmd.args, "--packfile=%.*s",
1646 (int) the_hash_algo->hexsz,
1647 packfile_uris.items[i].string);
1648 strvec_push(&cmd.args, uri);
1649 cmd.git_cmd = 1;
1650 cmd.no_stdin = 1;
1651 cmd.out = -1;
1652 if (start_command(&cmd))
1653 die("fetch-pack: unable to spawn http-fetch");
1654
1655 if (read_in_full(cmd.out, packname, 5) < 0 ||
1656 memcmp(packname, "keep\t", 5))
1657 die("fetch-pack: expected keep then TAB at start of http-fetch output");
1658
1659 if (read_in_full(cmd.out, packname,
1660 the_hash_algo->hexsz + 1) < 0 ||
1661 packname[the_hash_algo->hexsz] != '\n')
1662 die("fetch-pack: expected hash then LF at end of http-fetch output");
1663
1664 packname[the_hash_algo->hexsz] = '\0';
1665
1666 close(cmd.out);
1667
1668 if (finish_command(&cmd))
1669 die("fetch-pack: unable to finish http-fetch");
1670
1671 if (memcmp(packfile_uris.items[i].string, packname,
1672 the_hash_algo->hexsz))
1673 die("fetch-pack: pack downloaded from %s does not match expected hash %.*s",
1674 uri, (int) the_hash_algo->hexsz,
1675 packfile_uris.items[i].string);
1676
1677 string_list_append_nodup(pack_lockfiles,
1678 xstrfmt("%s/pack/pack-%s.keep",
1679 get_object_directory(),
1680 packname));
1681 }
1682 string_list_clear(&packfile_uris, 0);
1683
1684 if (negotiator)
1685 negotiator->release(negotiator);
1686
1687 oidset_clear(&common);
1688 return ref;
1689 }
1690
1691 static int fetch_pack_config_cb(const char *var, const char *value, void *cb)
1692 {
1693 if (strcmp(var, "fetch.fsck.skiplist") == 0) {
1694 const char *path;
1695
1696 if (git_config_pathname(&path, var, value))
1697 return 1;
1698 strbuf_addf(&fsck_msg_types, "%cskiplist=%s",
1699 fsck_msg_types.len ? ',' : '=', path);
1700 free((char *)path);
1701 return 0;
1702 }
1703
1704 if (skip_prefix(var, "fetch.fsck.", &var)) {
1705 if (is_valid_msg_type(var, value))
1706 strbuf_addf(&fsck_msg_types, "%c%s=%s",
1707 fsck_msg_types.len ? ',' : '=', var, value);
1708 else
1709 warning("Skipping unknown msg id '%s'", var);
1710 return 0;
1711 }
1712
1713 return git_default_config(var, value, cb);
1714 }
1715
1716 static void fetch_pack_config(void)
1717 {
1718 git_config_get_int("fetch.unpacklimit", &fetch_unpack_limit);
1719 git_config_get_int("transfer.unpacklimit", &transfer_unpack_limit);
1720 git_config_get_bool("repack.usedeltabaseoffset", &prefer_ofs_delta);
1721 git_config_get_bool("fetch.fsckobjects", &fetch_fsck_objects);
1722 git_config_get_bool("transfer.fsckobjects", &transfer_fsck_objects);
1723 git_config_get_bool("transfer.advertisesid", &advertise_sid);
1724 if (!uri_protocols.nr) {
1725 char *str;
1726
1727 if (!git_config_get_string("fetch.uriprotocols", &str) && str) {
1728 string_list_split(&uri_protocols, str, ',', -1);
1729 free(str);
1730 }
1731 }
1732
1733 git_config(fetch_pack_config_cb, NULL);
1734 }
1735
1736 static void fetch_pack_setup(void)
1737 {
1738 static int did_setup;
1739 if (did_setup)
1740 return;
1741 fetch_pack_config();
1742 if (0 <= transfer_unpack_limit)
1743 unpack_limit = transfer_unpack_limit;
1744 else if (0 <= fetch_unpack_limit)
1745 unpack_limit = fetch_unpack_limit;
1746 did_setup = 1;
1747 }
1748
1749 static int remove_duplicates_in_refs(struct ref **ref, int nr)
1750 {
1751 struct string_list names = STRING_LIST_INIT_NODUP;
1752 int src, dst;
1753
1754 for (src = dst = 0; src < nr; src++) {
1755 struct string_list_item *item;
1756 item = string_list_insert(&names, ref[src]->name);
1757 if (item->util)
1758 continue; /* already have it */
1759 item->util = ref[src];
1760 if (src != dst)
1761 ref[dst] = ref[src];
1762 dst++;
1763 }
1764 for (src = dst; src < nr; src++)
1765 ref[src] = NULL;
1766 string_list_clear(&names, 0);
1767 return dst;
1768 }
1769
1770 static void update_shallow(struct fetch_pack_args *args,
1771 struct ref **sought, int nr_sought,
1772 struct shallow_info *si)
1773 {
1774 struct oid_array ref = OID_ARRAY_INIT;
1775 int *status;
1776 int i;
1777
1778 if (args->deepen && alternate_shallow_file) {
1779 if (*alternate_shallow_file == '\0') { /* --unshallow */
1780 unlink_or_warn(git_path_shallow(the_repository));
1781 rollback_shallow_file(the_repository, &shallow_lock);
1782 } else
1783 commit_shallow_file(the_repository, &shallow_lock);
1784 alternate_shallow_file = NULL;
1785 return;
1786 }
1787
1788 if (!si->shallow || !si->shallow->nr)
1789 return;
1790
1791 if (args->cloning) {
1792 /*
1793 * remote is shallow, but this is a clone, there are
1794 * no objects in repo to worry about. Accept any
1795 * shallow points that exist in the pack (iow in repo
1796 * after get_pack() and reprepare_packed_git())
1797 */
1798 struct oid_array extra = OID_ARRAY_INIT;
1799 struct object_id *oid = si->shallow->oid;
1800 for (i = 0; i < si->shallow->nr; i++)
1801 if (has_object_file(&oid[i]))
1802 oid_array_append(&extra, &oid[i]);
1803 if (extra.nr) {
1804 setup_alternate_shallow(&shallow_lock,
1805 &alternate_shallow_file,
1806 &extra);
1807 commit_shallow_file(the_repository, &shallow_lock);
1808 alternate_shallow_file = NULL;
1809 }
1810 oid_array_clear(&extra);
1811 return;
1812 }
1813
1814 if (!si->nr_ours && !si->nr_theirs)
1815 return;
1816
1817 remove_nonexistent_theirs_shallow(si);
1818 if (!si->nr_ours && !si->nr_theirs)
1819 return;
1820 for (i = 0; i < nr_sought; i++)
1821 oid_array_append(&ref, &sought[i]->old_oid);
1822 si->ref = &ref;
1823
1824 if (args->update_shallow) {
1825 /*
1826 * remote is also shallow, .git/shallow may be updated
1827 * so all refs can be accepted. Make sure we only add
1828 * shallow roots that are actually reachable from new
1829 * refs.
1830 */
1831 struct oid_array extra = OID_ARRAY_INIT;
1832 struct object_id *oid = si->shallow->oid;
1833 assign_shallow_commits_to_refs(si, NULL, NULL);
1834 if (!si->nr_ours && !si->nr_theirs) {
1835 oid_array_clear(&ref);
1836 return;
1837 }
1838 for (i = 0; i < si->nr_ours; i++)
1839 oid_array_append(&extra, &oid[si->ours[i]]);
1840 for (i = 0; i < si->nr_theirs; i++)
1841 oid_array_append(&extra, &oid[si->theirs[i]]);
1842 setup_alternate_shallow(&shallow_lock,
1843 &alternate_shallow_file,
1844 &extra);
1845 commit_shallow_file(the_repository, &shallow_lock);
1846 oid_array_clear(&extra);
1847 oid_array_clear(&ref);
1848 alternate_shallow_file = NULL;
1849 return;
1850 }
1851
1852 /*
1853 * remote is also shallow, check what ref is safe to update
1854 * without updating .git/shallow
1855 */
1856 status = xcalloc(nr_sought, sizeof(*status));
1857 assign_shallow_commits_to_refs(si, NULL, status);
1858 if (si->nr_ours || si->nr_theirs) {
1859 for (i = 0; i < nr_sought; i++)
1860 if (status[i])
1861 sought[i]->status = REF_STATUS_REJECT_SHALLOW;
1862 }
1863 free(status);
1864 oid_array_clear(&ref);
1865 }
1866
1867 static int iterate_ref_map(void *cb_data, struct object_id *oid)
1868 {
1869 struct ref **rm = cb_data;
1870 struct ref *ref = *rm;
1871
1872 if (!ref)
1873 return -1; /* end of the list */
1874 *rm = ref->next;
1875 oidcpy(oid, &ref->old_oid);
1876 return 0;
1877 }
1878
1879 struct ref *fetch_pack(struct fetch_pack_args *args,
1880 int fd[],
1881 const struct ref *ref,
1882 struct ref **sought, int nr_sought,
1883 struct oid_array *shallow,
1884 struct string_list *pack_lockfiles,
1885 enum protocol_version version)
1886 {
1887 struct ref *ref_cpy;
1888 struct shallow_info si;
1889 struct oid_array shallows_scratch = OID_ARRAY_INIT;
1890
1891 fetch_pack_setup();
1892 if (nr_sought)
1893 nr_sought = remove_duplicates_in_refs(sought, nr_sought);
1894
1895 if (version != protocol_v2 && !ref) {
1896 packet_flush(fd[1]);
1897 die(_("no matching remote head"));
1898 }
1899 if (version == protocol_v2) {
1900 if (shallow->nr)
1901 BUG("Protocol V2 does not provide shallows at this point in the fetch");
1902 memset(&si, 0, sizeof(si));
1903 ref_cpy = do_fetch_pack_v2(args, fd, ref, sought, nr_sought,
1904 &shallows_scratch, &si,
1905 pack_lockfiles);
1906 } else {
1907 prepare_shallow_info(&si, shallow);
1908 ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought,
1909 &si, pack_lockfiles);
1910 }
1911 reprepare_packed_git(the_repository);
1912
1913 if (!args->cloning && args->deepen) {
1914 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1915 struct ref *iterator = ref_cpy;
1916 opt.shallow_file = alternate_shallow_file;
1917 if (args->deepen)
1918 opt.is_deepening_fetch = 1;
1919 if (check_connected(iterate_ref_map, &iterator, &opt)) {
1920 error(_("remote did not send all necessary objects"));
1921 free_refs(ref_cpy);
1922 ref_cpy = NULL;
1923 rollback_shallow_file(the_repository, &shallow_lock);
1924 goto cleanup;
1925 }
1926 args->connectivity_checked = 1;
1927 }
1928
1929 update_shallow(args, sought, nr_sought, &si);
1930 cleanup:
1931 clear_shallow_info(&si);
1932 oid_array_clear(&shallows_scratch);
1933 return ref_cpy;
1934 }
1935
1936 int report_unmatched_refs(struct ref **sought, int nr_sought)
1937 {
1938 int i, ret = 0;
1939
1940 for (i = 0; i < nr_sought; i++) {
1941 if (!sought[i])
1942 continue;
1943 switch (sought[i]->match_status) {
1944 case REF_MATCHED:
1945 continue;
1946 case REF_NOT_MATCHED:
1947 error(_("no such remote ref %s"), sought[i]->name);
1948 break;
1949 case REF_UNADVERTISED_NOT_ALLOWED:
1950 error(_("Server does not allow request for unadvertised object %s"),
1951 sought[i]->name);
1952 break;
1953 }
1954 ret = 1;
1955 }
1956 return ret;
1957 }
git for Debian