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refs: implement reference transaction hook
[git/debian.git] / fetch-pack.c
blobd8bbf45ee27a732469287f99768321640f9d992a
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
42 /* Remember to update object flag allocation in object.h */
43 #define COMPLETE (1U << 0)
44 #define ALTERNATE (1U << 1)
45
46 /*
47 * After sending this many "have"s if we do not get any new ACK , we
48 * give up traversing our history.
49 */
50 #define MAX_IN_VAIN 256
51
52 static int multi_ack, use_sideband;
53 /* Allow specifying sha1 if it is a ref tip. */
54 #define ALLOW_TIP_SHA1 01
55 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
56 #define ALLOW_REACHABLE_SHA1 02
57 static unsigned int allow_unadvertised_object_request;
58
59 __attribute__((format (printf, 2, 3)))
60 static inline void print_verbose(const struct fetch_pack_args *args,
61 const char *fmt, ...)
62 {
63 va_list params;
64
65 if (!args->verbose)
66 return;
67
68 va_start(params, fmt);
69 vfprintf(stderr, fmt, params);
70 va_end(params);
71 fputc('\n', stderr);
72 }
73
74 struct alternate_object_cache {
75 struct object **items;
76 size_t nr, alloc;
77 };
78
79 static void cache_one_alternate(const struct object_id *oid,
80 void *vcache)
81 {
82 struct alternate_object_cache *cache = vcache;
83 struct object *obj = parse_object(the_repository, oid);
84
85 if (!obj || (obj->flags & ALTERNATE))
86 return;
87
88 obj->flags |= ALTERNATE;
89 ALLOC_GROW(cache->items, cache->nr + 1, cache->alloc);
90 cache->items[cache->nr++] = obj;
91 }
92
93 static void for_each_cached_alternate(struct fetch_negotiator *negotiator,
94 void (*cb)(struct fetch_negotiator *,
95 struct object *))
96 {
97 static int initialized;
98 static struct alternate_object_cache cache;
99 size_t i;
100
101 if (!initialized) {
102 for_each_alternate_ref(cache_one_alternate, &cache);
103 initialized = 1;
104 }
105
106 for (i = 0; i < cache.nr; i++)
107 cb(negotiator, cache.items[i]);
108 }
109
110 static int rev_list_insert_ref(struct fetch_negotiator *negotiator,
111 const char *refname,
112 const struct object_id *oid)
113 {
114 struct object *o = deref_tag(the_repository,
115 parse_object(the_repository, oid),
116 refname, 0);
117
118 if (o && o->type == OBJ_COMMIT)
119 negotiator->add_tip(negotiator, (struct commit *)o);
120
121 return 0;
122 }
123
124 static int rev_list_insert_ref_oid(const char *refname, const struct object_id *oid,
125 int flag, void *cb_data)
126 {
127 return rev_list_insert_ref(cb_data, refname, oid);
128 }
129
130 enum ack_type {
131 NAK = 0,
132 ACK,
133 ACK_continue,
134 ACK_common,
135 ACK_ready
136 };
137
138 static void consume_shallow_list(struct fetch_pack_args *args,
139 struct packet_reader *reader)
140 {
141 if (args->stateless_rpc && args->deepen) {
142 /* If we sent a depth we will get back "duplicate"
143 * shallow and unshallow commands every time there
144 * is a block of have lines exchanged.
145 */
146 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
147 if (starts_with(reader->line, "shallow "))
148 continue;
149 if (starts_with(reader->line, "unshallow "))
150 continue;
151 die(_("git fetch-pack: expected shallow list"));
152 }
153 if (reader->status != PACKET_READ_FLUSH)
154 die(_("git fetch-pack: expected a flush packet after shallow list"));
155 }
156 }
157
158 static enum ack_type get_ack(struct packet_reader *reader,
159 struct object_id *result_oid)
160 {
161 int len;
162 const char *arg;
163
164 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
165 die(_("git fetch-pack: expected ACK/NAK, got a flush packet"));
166 len = reader->pktlen;
167
168 if (!strcmp(reader->line, "NAK"))
169 return NAK;
170 if (skip_prefix(reader->line, "ACK ", &arg)) {
171 const char *p;
172 if (!parse_oid_hex(arg, result_oid, &p)) {
173 len -= p - reader->line;
174 if (len < 1)
175 return ACK;
176 if (strstr(p, "continue"))
177 return ACK_continue;
178 if (strstr(p, "common"))
179 return ACK_common;
180 if (strstr(p, "ready"))
181 return ACK_ready;
182 return ACK;
183 }
184 }
185 die(_("git fetch-pack: expected ACK/NAK, got '%s'"), reader->line);
186 }
187
188 static void send_request(struct fetch_pack_args *args,
189 int fd, struct strbuf *buf)
190 {
191 if (args->stateless_rpc) {
192 send_sideband(fd, -1, buf->buf, buf->len, LARGE_PACKET_MAX);
193 packet_flush(fd);
194 } else {
195 if (write_in_full(fd, buf->buf, buf->len) < 0)
196 die_errno(_("unable to write to remote"));
197 }
198 }
199
200 static void insert_one_alternate_object(struct fetch_negotiator *negotiator,
201 struct object *obj)
202 {
203 rev_list_insert_ref(negotiator, NULL, &obj->oid);
204 }
205
206 #define INITIAL_FLUSH 16
207 #define PIPESAFE_FLUSH 32
208 #define LARGE_FLUSH 16384
209
210 static int next_flush(int stateless_rpc, int count)
211 {
212 if (stateless_rpc) {
213 if (count < LARGE_FLUSH)
214 count <<= 1;
215 else
216 count = count * 11 / 10;
217 } else {
218 if (count < PIPESAFE_FLUSH)
219 count <<= 1;
220 else
221 count += PIPESAFE_FLUSH;
222 }
223 return count;
224 }
225
226 static void mark_tips(struct fetch_negotiator *negotiator,
227 const struct oid_array *negotiation_tips)
228 {
229 int i;
230
231 if (!negotiation_tips) {
232 for_each_ref(rev_list_insert_ref_oid, negotiator);
233 return;
234 }
235
236 for (i = 0; i < negotiation_tips->nr; i++)
237 rev_list_insert_ref(negotiator, NULL,
238 &negotiation_tips->oid[i]);
239 return;
240 }
241
242 static int find_common(struct fetch_negotiator *negotiator,
243 struct fetch_pack_args *args,
244 int fd[2], struct object_id *result_oid,
245 struct ref *refs)
246 {
247 int fetching;
248 int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval;
249 const struct object_id *oid;
250 unsigned in_vain = 0;
251 int got_continue = 0;
252 int got_ready = 0;
253 struct strbuf req_buf = STRBUF_INIT;
254 size_t state_len = 0;
255 struct packet_reader reader;
256
257 if (args->stateless_rpc && multi_ack == 1)
258 die(_("--stateless-rpc requires multi_ack_detailed"));
259
260 packet_reader_init(&reader, fd[0], NULL, 0,
261 PACKET_READ_CHOMP_NEWLINE |
262 PACKET_READ_DIE_ON_ERR_PACKET);
263
264 if (!args->no_dependents) {
265 mark_tips(negotiator, args->negotiation_tips);
266 for_each_cached_alternate(negotiator, insert_one_alternate_object);
267 }
268
269 fetching = 0;
270 for ( ; refs ; refs = refs->next) {
271 struct object_id *remote = &refs->old_oid;
272 const char *remote_hex;
273 struct object *o;
274
275 /*
276 * If that object is complete (i.e. it is an ancestor of a
277 * local ref), we tell them we have it but do not have to
278 * tell them about its ancestors, which they already know
279 * about.
280 *
281 * We use lookup_object here because we are only
282 * interested in the case we *know* the object is
283 * reachable and we have already scanned it.
284 *
285 * Do this only if args->no_dependents is false (if it is true,
286 * we cannot trust the object flags).
287 */
288 if (!args->no_dependents &&
289 ((o = lookup_object(the_repository, remote)) != NULL) &&
290 (o->flags & COMPLETE)) {
291 continue;
292 }
293
294 remote_hex = oid_to_hex(remote);
295 if (!fetching) {
296 struct strbuf c = STRBUF_INIT;
297 if (multi_ack == 2) strbuf_addstr(&c, " multi_ack_detailed");
298 if (multi_ack == 1) strbuf_addstr(&c, " multi_ack");
299 if (no_done) strbuf_addstr(&c, " no-done");
300 if (use_sideband == 2) strbuf_addstr(&c, " side-band-64k");
301 if (use_sideband == 1) strbuf_addstr(&c, " side-band");
302 if (args->deepen_relative) strbuf_addstr(&c, " deepen-relative");
303 if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack");
304 if (args->no_progress) strbuf_addstr(&c, " no-progress");
305 if (args->include_tag) strbuf_addstr(&c, " include-tag");
306 if (prefer_ofs_delta) strbuf_addstr(&c, " ofs-delta");
307 if (deepen_since_ok) strbuf_addstr(&c, " deepen-since");
308 if (deepen_not_ok) strbuf_addstr(&c, " deepen-not");
309 if (agent_supported) strbuf_addf(&c, " agent=%s",
310 git_user_agent_sanitized());
311 if (args->filter_options.choice)
312 strbuf_addstr(&c, " filter");
313 packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
314 strbuf_release(&c);
315 } else
316 packet_buf_write(&req_buf, "want %s\n", remote_hex);
317 fetching++;
318 }
319
320 if (!fetching) {
321 strbuf_release(&req_buf);
322 packet_flush(fd[1]);
323 return 1;
324 }
325
326 if (is_repository_shallow(the_repository))
327 write_shallow_commits(&req_buf, 1, NULL);
328 if (args->depth > 0)
329 packet_buf_write(&req_buf, "deepen %d", args->depth);
330 if (args->deepen_since) {
331 timestamp_t max_age = approxidate(args->deepen_since);
332 packet_buf_write(&req_buf, "deepen-since %"PRItime, max_age);
333 }
334 if (args->deepen_not) {
335 int i;
336 for (i = 0; i < args->deepen_not->nr; i++) {
337 struct string_list_item *s = args->deepen_not->items + i;
338 packet_buf_write(&req_buf, "deepen-not %s", s->string);
339 }
340 }
341 if (server_supports_filtering && args->filter_options.choice) {
342 const char *spec =
343 expand_list_objects_filter_spec(&args->filter_options);
344 packet_buf_write(&req_buf, "filter %s", spec);
345 }
346 packet_buf_flush(&req_buf);
347 state_len = req_buf.len;
348
349 if (args->deepen) {
350 const char *arg;
351 struct object_id oid;
352
353 send_request(args, fd[1], &req_buf);
354 while (packet_reader_read(&reader) == PACKET_READ_NORMAL) {
355 if (skip_prefix(reader.line, "shallow ", &arg)) {
356 if (get_oid_hex(arg, &oid))
357 die(_("invalid shallow line: %s"), reader.line);
358 register_shallow(the_repository, &oid);
359 continue;
360 }
361 if (skip_prefix(reader.line, "unshallow ", &arg)) {
362 if (get_oid_hex(arg, &oid))
363 die(_("invalid unshallow line: %s"), reader.line);
364 if (!lookup_object(the_repository, &oid))
365 die(_("object not found: %s"), reader.line);
366 /* make sure that it is parsed as shallow */
367 if (!parse_object(the_repository, &oid))
368 die(_("error in object: %s"), reader.line);
369 if (unregister_shallow(&oid))
370 die(_("no shallow found: %s"), reader.line);
371 continue;
372 }
373 die(_("expected shallow/unshallow, got %s"), reader.line);
374 }
375 } else if (!args->stateless_rpc)
376 send_request(args, fd[1], &req_buf);
377
378 if (!args->stateless_rpc) {
379 /* If we aren't using the stateless-rpc interface
380 * we don't need to retain the headers.
381 */
382 strbuf_setlen(&req_buf, 0);
383 state_len = 0;
384 }
385
386 trace2_region_enter("fetch-pack", "negotiation_v0_v1", the_repository);
387 flushes = 0;
388 retval = -1;
389 if (args->no_dependents)
390 goto done;
391 while ((oid = negotiator->next(negotiator))) {
392 packet_buf_write(&req_buf, "have %s\n", oid_to_hex(oid));
393 print_verbose(args, "have %s", oid_to_hex(oid));
394 in_vain++;
395 if (flush_at <= ++count) {
396 int ack;
397
398 packet_buf_flush(&req_buf);
399 send_request(args, fd[1], &req_buf);
400 strbuf_setlen(&req_buf, state_len);
401 flushes++;
402 flush_at = next_flush(args->stateless_rpc, count);
403
404 /*
405 * We keep one window "ahead" of the other side, and
406 * will wait for an ACK only on the next one
407 */
408 if (!args->stateless_rpc && count == INITIAL_FLUSH)
409 continue;
410
411 consume_shallow_list(args, &reader);
412 do {
413 ack = get_ack(&reader, result_oid);
414 if (ack)
415 print_verbose(args, _("got %s %d %s"), "ack",
416 ack, oid_to_hex(result_oid));
417 switch (ack) {
418 case ACK:
419 flushes = 0;
420 multi_ack = 0;
421 retval = 0;
422 goto done;
423 case ACK_common:
424 case ACK_ready:
425 case ACK_continue: {
426 struct commit *commit =
427 lookup_commit(the_repository,
428 result_oid);
429 int was_common;
430
431 if (!commit)
432 die(_("invalid commit %s"), oid_to_hex(result_oid));
433 was_common = negotiator->ack(negotiator, commit);
434 if (args->stateless_rpc
435 && ack == ACK_common
436 && !was_common) {
437 /* We need to replay the have for this object
438 * on the next RPC request so the peer knows
439 * it is in common with us.
440 */
441 const char *hex = oid_to_hex(result_oid);
442 packet_buf_write(&req_buf, "have %s\n", hex);
443 state_len = req_buf.len;
444 /*
445 * Reset in_vain because an ack
446 * for this commit has not been
447 * seen.
448 */
449 in_vain = 0;
450 } else if (!args->stateless_rpc
451 || ack != ACK_common)
452 in_vain = 0;
453 retval = 0;
454 got_continue = 1;
455 if (ack == ACK_ready)
456 got_ready = 1;
457 break;
458 }
459 }
460 } while (ack);
461 flushes--;
462 if (got_continue && MAX_IN_VAIN < in_vain) {
463 print_verbose(args, _("giving up"));
464 break; /* give up */
465 }
466 if (got_ready)
467 break;
468 }
469 }
470 done:
471 trace2_region_leave("fetch-pack", "negotiation_v0_v1", the_repository);
472 if (!got_ready || !no_done) {
473 packet_buf_write(&req_buf, "done\n");
474 send_request(args, fd[1], &req_buf);
475 }
476 print_verbose(args, _("done"));
477 if (retval != 0) {
478 multi_ack = 0;
479 flushes++;
480 }
481 strbuf_release(&req_buf);
482
483 if (!got_ready || !no_done)
484 consume_shallow_list(args, &reader);
485 while (flushes || multi_ack) {
486 int ack = get_ack(&reader, result_oid);
487 if (ack) {
488 print_verbose(args, _("got %s (%d) %s"), "ack",
489 ack, oid_to_hex(result_oid));
490 if (ack == ACK)
491 return 0;
492 multi_ack = 1;
493 continue;
494 }
495 flushes--;
496 }
497 /* it is no error to fetch into a completely empty repo */
498 return count ? retval : 0;
499 }
500
501 static struct commit_list *complete;
502
503 static int mark_complete(const struct object_id *oid)
504 {
505 struct object *o = parse_object(the_repository, oid);
506
507 while (o && o->type == OBJ_TAG) {
508 struct tag *t = (struct tag *) o;
509 if (!t->tagged)
510 break; /* broken repository */
511 o->flags |= COMPLETE;
512 o = parse_object(the_repository, &t->tagged->oid);
513 }
514 if (o && o->type == OBJ_COMMIT) {
515 struct commit *commit = (struct commit *)o;
516 if (!(commit->object.flags & COMPLETE)) {
517 commit->object.flags |= COMPLETE;
518 commit_list_insert(commit, &complete);
519 }
520 }
521 return 0;
522 }
523
524 static int mark_complete_oid(const char *refname, const struct object_id *oid,
525 int flag, void *cb_data)
526 {
527 return mark_complete(oid);
528 }
529
530 static void mark_recent_complete_commits(struct fetch_pack_args *args,
531 timestamp_t cutoff)
532 {
533 while (complete && cutoff <= complete->item->date) {
534 print_verbose(args, _("Marking %s as complete"),
535 oid_to_hex(&complete->item->object.oid));
536 pop_most_recent_commit(&complete, COMPLETE);
537 }
538 }
539
540 static void add_refs_to_oidset(struct oidset *oids, struct ref *refs)
541 {
542 for (; refs; refs = refs->next)
543 oidset_insert(oids, &refs->old_oid);
544 }
545
546 static int is_unmatched_ref(const struct ref *ref)
547 {
548 struct object_id oid;
549 const char *p;
550 return ref->match_status == REF_NOT_MATCHED &&
551 !parse_oid_hex(ref->name, &oid, &p) &&
552 *p == '\0' &&
553 oideq(&oid, &ref->old_oid);
554 }
555
556 static void filter_refs(struct fetch_pack_args *args,
557 struct ref **refs,
558 struct ref **sought, int nr_sought)
559 {
560 struct ref *newlist = NULL;
561 struct ref **newtail = &newlist;
562 struct ref *unmatched = NULL;
563 struct ref *ref, *next;
564 struct oidset tip_oids = OIDSET_INIT;
565 int i;
566 int strict = !(allow_unadvertised_object_request &
567 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
568
569 i = 0;
570 for (ref = *refs; ref; ref = next) {
571 int keep = 0;
572 next = ref->next;
573
574 if (starts_with(ref->name, "refs/") &&
575 check_refname_format(ref->name, 0)) {
576 /*
577 * trash or a peeled value; do not even add it to
578 * unmatched list
579 */
580 free_one_ref(ref);
581 continue;
582 } else {
583 while (i < nr_sought) {
584 int cmp = strcmp(ref->name, sought[i]->name);
585 if (cmp < 0)
586 break; /* definitely do not have it */
587 else if (cmp == 0) {
588 keep = 1; /* definitely have it */
589 sought[i]->match_status = REF_MATCHED;
590 }
591 i++;
592 }
593
594 if (!keep && args->fetch_all &&
595 (!args->deepen || !starts_with(ref->name, "refs/tags/")))
596 keep = 1;
597 }
598
599 if (keep) {
600 *newtail = ref;
601 ref->next = NULL;
602 newtail = &ref->next;
603 } else {
604 ref->next = unmatched;
605 unmatched = ref;
606 }
607 }
608
609 if (strict) {
610 for (i = 0; i < nr_sought; i++) {
611 ref = sought[i];
612 if (!is_unmatched_ref(ref))
613 continue;
614
615 add_refs_to_oidset(&tip_oids, unmatched);
616 add_refs_to_oidset(&tip_oids, newlist);
617 break;
618 }
619 }
620
621 /* Append unmatched requests to the list */
622 for (i = 0; i < nr_sought; i++) {
623 ref = sought[i];
624 if (!is_unmatched_ref(ref))
625 continue;
626
627 if (!strict || oidset_contains(&tip_oids, &ref->old_oid)) {
628 ref->match_status = REF_MATCHED;
629 *newtail = copy_ref(ref);
630 newtail = &(*newtail)->next;
631 } else {
632 ref->match_status = REF_UNADVERTISED_NOT_ALLOWED;
633 }
634 }
635
636 oidset_clear(&tip_oids);
637 free_refs(unmatched);
638
639 *refs = newlist;
640 }
641
642 static void mark_alternate_complete(struct fetch_negotiator *unused,
643 struct object *obj)
644 {
645 mark_complete(&obj->oid);
646 }
647
648 struct loose_object_iter {
649 struct oidset *loose_object_set;
650 struct ref *refs;
651 };
652
653 /*
654 * Mark recent commits available locally and reachable from a local ref as
655 * COMPLETE. If args->no_dependents is false, also mark COMPLETE remote refs as
656 * COMMON_REF (otherwise, we are not planning to participate in negotiation, and
657 * thus do not need COMMON_REF marks).
658 *
659 * The cutoff time for recency is determined by this heuristic: it is the
660 * earliest commit time of the objects in refs that are commits and that we know
661 * the commit time of.
662 */
663 static void mark_complete_and_common_ref(struct fetch_negotiator *negotiator,
664 struct fetch_pack_args *args,
665 struct ref **refs)
666 {
667 struct ref *ref;
668 int old_save_commit_buffer = save_commit_buffer;
669 timestamp_t cutoff = 0;
670
671 save_commit_buffer = 0;
672
673 trace2_region_enter("fetch-pack", "parse_remote_refs_and_find_cutoff", NULL);
674 for (ref = *refs; ref; ref = ref->next) {
675 struct object *o;
676
677 if (!has_object_file_with_flags(&ref->old_oid,
678 OBJECT_INFO_QUICK |
679 OBJECT_INFO_SKIP_FETCH_OBJECT))
680 continue;
681 o = parse_object(the_repository, &ref->old_oid);
682 if (!o)
683 continue;
684
685 /*
686 * We already have it -- which may mean that we were
687 * in sync with the other side at some time after
688 * that (it is OK if we guess wrong here).
689 */
690 if (o->type == OBJ_COMMIT) {
691 struct commit *commit = (struct commit *)o;
692 if (!cutoff || cutoff < commit->date)
693 cutoff = commit->date;
694 }
695 }
696 trace2_region_leave("fetch-pack", "parse_remote_refs_and_find_cutoff", NULL);
697
698 /*
699 * This block marks all local refs as COMPLETE, and then recursively marks all
700 * parents of those refs as COMPLETE.
701 */
702 trace2_region_enter("fetch-pack", "mark_complete_local_refs", NULL);
703 if (!args->deepen) {
704 for_each_ref(mark_complete_oid, NULL);
705 for_each_cached_alternate(NULL, mark_alternate_complete);
706 commit_list_sort_by_date(&complete);
707 if (cutoff)
708 mark_recent_complete_commits(args, cutoff);
709 }
710 trace2_region_leave("fetch-pack", "mark_complete_local_refs", NULL);
711
712 /*
713 * Mark all complete remote refs as common refs.
714 * Don't mark them common yet; the server has to be told so first.
715 */
716 trace2_region_enter("fetch-pack", "mark_common_remote_refs", NULL);
717 for (ref = *refs; ref; ref = ref->next) {
718 struct object *o = deref_tag(the_repository,
719 lookup_object(the_repository,
720 &ref->old_oid),
721 NULL, 0);
722
723 if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE))
724 continue;
725
726 negotiator->known_common(negotiator,
727 (struct commit *)o);
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 static int get_pack(struct fetch_pack_args *args,
797 int xd[2], char **pack_lockfile,
798 struct ref **sought, int nr_sought)
799 {
800 struct async demux;
801 int do_keep = args->keep_pack;
802 const char *cmd_name;
803 struct pack_header header;
804 int pass_header = 0;
805 struct child_process cmd = CHILD_PROCESS_INIT;
806 int ret;
807
808 memset(&demux, 0, sizeof(demux));
809 if (use_sideband) {
810 /* xd[] is talking with upload-pack; subprocess reads from
811 * xd[0], spits out band#2 to stderr, and feeds us band#1
812 * through demux->out.
813 */
814 demux.proc = sideband_demux;
815 demux.data = xd;
816 demux.out = -1;
817 demux.isolate_sigpipe = 1;
818 if (start_async(&demux))
819 die(_("fetch-pack: unable to fork off sideband demultiplexer"));
820 }
821 else
822 demux.out = xd[0];
823
824 if (!args->keep_pack && unpack_limit) {
825
826 if (read_pack_header(demux.out, &header))
827 die(_("protocol error: bad pack header"));
828 pass_header = 1;
829 if (ntohl(header.hdr_entries) < unpack_limit)
830 do_keep = 0;
831 else
832 do_keep = 1;
833 }
834
835 if (alternate_shallow_file) {
836 argv_array_push(&cmd.args, "--shallow-file");
837 argv_array_push(&cmd.args, alternate_shallow_file);
838 }
839
840 if (do_keep || args->from_promisor) {
841 if (pack_lockfile)
842 cmd.out = -1;
843 cmd_name = "index-pack";
844 argv_array_push(&cmd.args, cmd_name);
845 argv_array_push(&cmd.args, "--stdin");
846 if (!args->quiet && !args->no_progress)
847 argv_array_push(&cmd.args, "-v");
848 if (args->use_thin_pack)
849 argv_array_push(&cmd.args, "--fix-thin");
850 if (do_keep && (args->lock_pack || unpack_limit)) {
851 char hostname[HOST_NAME_MAX + 1];
852 if (xgethostname(hostname, sizeof(hostname)))
853 xsnprintf(hostname, sizeof(hostname), "localhost");
854 argv_array_pushf(&cmd.args,
855 "--keep=fetch-pack %"PRIuMAX " on %s",
856 (uintmax_t)getpid(), hostname);
857 }
858 if (args->check_self_contained_and_connected)
859 argv_array_push(&cmd.args, "--check-self-contained-and-connected");
860 /*
861 * If we're obtaining the filename of a lockfile, we'll use
862 * that filename to write a .promisor file with more
863 * information below. If not, we need index-pack to do it for
864 * us.
865 */
866 if (!(do_keep && pack_lockfile) && args->from_promisor)
867 argv_array_push(&cmd.args, "--promisor");
868 }
869 else {
870 cmd_name = "unpack-objects";
871 argv_array_push(&cmd.args, cmd_name);
872 if (args->quiet || args->no_progress)
873 argv_array_push(&cmd.args, "-q");
874 args->check_self_contained_and_connected = 0;
875 }
876
877 if (pass_header)
878 argv_array_pushf(&cmd.args, "--pack_header=%"PRIu32",%"PRIu32,
879 ntohl(header.hdr_version),
880 ntohl(header.hdr_entries));
881 if (fetch_fsck_objects >= 0
882 ? fetch_fsck_objects
883 : transfer_fsck_objects >= 0
884 ? transfer_fsck_objects
885 : 0) {
886 if (args->from_promisor)
887 /*
888 * We cannot use --strict in index-pack because it
889 * checks both broken objects and links, but we only
890 * want to check for broken objects.
891 */
892 argv_array_push(&cmd.args, "--fsck-objects");
893 else
894 argv_array_pushf(&cmd.args, "--strict%s",
895 fsck_msg_types.buf);
896 }
897
898 cmd.in = demux.out;
899 cmd.git_cmd = 1;
900 if (start_command(&cmd))
901 die(_("fetch-pack: unable to fork off %s"), cmd_name);
902 if (do_keep && pack_lockfile) {
903 *pack_lockfile = index_pack_lockfile(cmd.out);
904 close(cmd.out);
905 }
906
907 if (!use_sideband)
908 /* Closed by start_command() */
909 xd[0] = -1;
910
911 ret = finish_command(&cmd);
912 if (!ret || (args->check_self_contained_and_connected && ret == 1))
913 args->self_contained_and_connected =
914 args->check_self_contained_and_connected &&
915 ret == 0;
916 else
917 die(_("%s failed"), cmd_name);
918 if (use_sideband && finish_async(&demux))
919 die(_("error in sideband demultiplexer"));
920
921 /*
922 * Now that index-pack has succeeded, write the promisor file using the
923 * obtained .keep filename if necessary
924 */
925 if (do_keep && pack_lockfile && args->from_promisor)
926 write_promisor_file(*pack_lockfile, sought, nr_sought);
927
928 return 0;
929 }
930
931 static int cmp_ref_by_name(const void *a_, const void *b_)
932 {
933 const struct ref *a = *((const struct ref **)a_);
934 const struct ref *b = *((const struct ref **)b_);
935 return strcmp(a->name, b->name);
936 }
937
938 static struct ref *do_fetch_pack(struct fetch_pack_args *args,
939 int fd[2],
940 const struct ref *orig_ref,
941 struct ref **sought, int nr_sought,
942 struct shallow_info *si,
943 char **pack_lockfile)
944 {
945 struct repository *r = the_repository;
946 struct ref *ref = copy_ref_list(orig_ref);
947 struct object_id oid;
948 const char *agent_feature;
949 int agent_len;
950 struct fetch_negotiator negotiator_alloc;
951 struct fetch_negotiator *negotiator;
952
953 if (args->no_dependents) {
954 negotiator = NULL;
955 } else {
956 negotiator = &negotiator_alloc;
957 fetch_negotiator_init(r, negotiator);
958 }
959
960 sort_ref_list(&ref, ref_compare_name);
961 QSORT(sought, nr_sought, cmp_ref_by_name);
962
963 if ((agent_feature = server_feature_value("agent", &agent_len))) {
964 agent_supported = 1;
965 if (agent_len)
966 print_verbose(args, _("Server version is %.*s"),
967 agent_len, agent_feature);
968 }
969
970 if (server_supports("shallow"))
971 print_verbose(args, _("Server supports %s"), "shallow");
972 else if (args->depth > 0 || is_repository_shallow(r))
973 die(_("Server does not support shallow clients"));
974 if (args->depth > 0 || args->deepen_since || args->deepen_not)
975 args->deepen = 1;
976 if (server_supports("multi_ack_detailed")) {
977 print_verbose(args, _("Server supports %s"), "multi_ack_detailed");
978 multi_ack = 2;
979 if (server_supports("no-done")) {
980 print_verbose(args, _("Server supports %s"), "no-done");
981 if (args->stateless_rpc)
982 no_done = 1;
983 }
984 }
985 else if (server_supports("multi_ack")) {
986 print_verbose(args, _("Server supports %s"), "multi_ack");
987 multi_ack = 1;
988 }
989 if (server_supports("side-band-64k")) {
990 print_verbose(args, _("Server supports %s"), "side-band-64k");
991 use_sideband = 2;
992 }
993 else if (server_supports("side-band")) {
994 print_verbose(args, _("Server supports %s"), "side-band");
995 use_sideband = 1;
996 }
997 if (server_supports("allow-tip-sha1-in-want")) {
998 print_verbose(args, _("Server supports %s"), "allow-tip-sha1-in-want");
999 allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1000 }
1001 if (server_supports("allow-reachable-sha1-in-want")) {
1002 print_verbose(args, _("Server supports %s"), "allow-reachable-sha1-in-want");
1003 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1004 }
1005 if (server_supports("thin-pack"))
1006 print_verbose(args, _("Server supports %s"), "thin-pack");
1007 else
1008 args->use_thin_pack = 0;
1009 if (server_supports("no-progress"))
1010 print_verbose(args, _("Server supports %s"), "no-progress");
1011 else
1012 args->no_progress = 0;
1013 if (server_supports("include-tag"))
1014 print_verbose(args, _("Server supports %s"), "include-tag");
1015 else
1016 args->include_tag = 0;
1017 if (server_supports("ofs-delta"))
1018 print_verbose(args, _("Server supports %s"), "ofs-delta");
1019 else
1020 prefer_ofs_delta = 0;
1021
1022 if (server_supports("filter")) {
1023 server_supports_filtering = 1;
1024 print_verbose(args, _("Server supports %s"), "filter");
1025 } else if (args->filter_options.choice) {
1026 warning("filtering not recognized by server, ignoring");
1027 }
1028
1029 if (server_supports("deepen-since")) {
1030 print_verbose(args, _("Server supports %s"), "deepen-since");
1031 deepen_since_ok = 1;
1032 } else if (args->deepen_since)
1033 die(_("Server does not support --shallow-since"));
1034 if (server_supports("deepen-not")) {
1035 print_verbose(args, _("Server supports %s"), "deepen-not");
1036 deepen_not_ok = 1;
1037 } else if (args->deepen_not)
1038 die(_("Server does not support --shallow-exclude"));
1039 if (server_supports("deepen-relative"))
1040 print_verbose(args, _("Server supports %s"), "deepen-relative");
1041 else if (args->deepen_relative)
1042 die(_("Server does not support --deepen"));
1043
1044 if (!args->no_dependents) {
1045 mark_complete_and_common_ref(negotiator, args, &ref);
1046 filter_refs(args, &ref, sought, nr_sought);
1047 if (everything_local(args, &ref)) {
1048 packet_flush(fd[1]);
1049 goto all_done;
1050 }
1051 } else {
1052 filter_refs(args, &ref, sought, nr_sought);
1053 }
1054 if (find_common(negotiator, args, fd, &oid, ref) < 0)
1055 if (!args->keep_pack)
1056 /* When cloning, it is not unusual to have
1057 * no common commit.
1058 */
1059 warning(_("no common commits"));
1060
1061 if (args->stateless_rpc)
1062 packet_flush(fd[1]);
1063 if (args->deepen)
1064 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
1065 NULL);
1066 else if (si->nr_ours || si->nr_theirs)
1067 alternate_shallow_file = setup_temporary_shallow(si->shallow);
1068 else
1069 alternate_shallow_file = NULL;
1070 if (get_pack(args, fd, pack_lockfile, sought, nr_sought))
1071 die(_("git fetch-pack: fetch failed."));
1072
1073 all_done:
1074 if (negotiator)
1075 negotiator->release(negotiator);
1076 return ref;
1077 }
1078
1079 static void add_shallow_requests(struct strbuf *req_buf,
1080 const struct fetch_pack_args *args)
1081 {
1082 if (is_repository_shallow(the_repository))
1083 write_shallow_commits(req_buf, 1, NULL);
1084 if (args->depth > 0)
1085 packet_buf_write(req_buf, "deepen %d", args->depth);
1086 if (args->deepen_since) {
1087 timestamp_t max_age = approxidate(args->deepen_since);
1088 packet_buf_write(req_buf, "deepen-since %"PRItime, max_age);
1089 }
1090 if (args->deepen_not) {
1091 int i;
1092 for (i = 0; i < args->deepen_not->nr; i++) {
1093 struct string_list_item *s = args->deepen_not->items + i;
1094 packet_buf_write(req_buf, "deepen-not %s", s->string);
1095 }
1096 }
1097 if (args->deepen_relative)
1098 packet_buf_write(req_buf, "deepen-relative\n");
1099 }
1100
1101 static void add_wants(int no_dependents, const struct ref *wants, struct strbuf *req_buf)
1102 {
1103 int use_ref_in_want = server_supports_feature("fetch", "ref-in-want", 0);
1104
1105 for ( ; wants ; wants = wants->next) {
1106 const struct object_id *remote = &wants->old_oid;
1107 struct object *o;
1108
1109 /*
1110 * If that object is complete (i.e. it is an ancestor of a
1111 * local ref), we tell them we have it but do not have to
1112 * tell them about its ancestors, which they already know
1113 * about.
1114 *
1115 * We use lookup_object here because we are only
1116 * interested in the case we *know* the object is
1117 * reachable and we have already scanned it.
1118 *
1119 * Do this only if args->no_dependents is false (if it is true,
1120 * we cannot trust the object flags).
1121 */
1122 if (!no_dependents &&
1123 ((o = lookup_object(the_repository, remote)) != NULL) &&
1124 (o->flags & COMPLETE)) {
1125 continue;
1126 }
1127
1128 if (!use_ref_in_want || wants->exact_oid)
1129 packet_buf_write(req_buf, "want %s\n", oid_to_hex(remote));
1130 else
1131 packet_buf_write(req_buf, "want-ref %s\n", wants->name);
1132 }
1133 }
1134
1135 static void add_common(struct strbuf *req_buf, struct oidset *common)
1136 {
1137 struct oidset_iter iter;
1138 const struct object_id *oid;
1139 oidset_iter_init(common, &iter);
1140
1141 while ((oid = oidset_iter_next(&iter))) {
1142 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1143 }
1144 }
1145
1146 static int add_haves(struct fetch_negotiator *negotiator,
1147 int seen_ack,
1148 struct strbuf *req_buf,
1149 int *haves_to_send, int *in_vain)
1150 {
1151 int ret = 0;
1152 int haves_added = 0;
1153 const struct object_id *oid;
1154
1155 while ((oid = negotiator->next(negotiator))) {
1156 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1157 if (++haves_added >= *haves_to_send)
1158 break;
1159 }
1160
1161 *in_vain += haves_added;
1162 if (!haves_added || (seen_ack && *in_vain >= MAX_IN_VAIN)) {
1163 /* Send Done */
1164 packet_buf_write(req_buf, "done\n");
1165 ret = 1;
1166 }
1167
1168 /* Increase haves to send on next round */
1169 *haves_to_send = next_flush(1, *haves_to_send);
1170
1171 return ret;
1172 }
1173
1174 static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out,
1175 struct fetch_pack_args *args,
1176 const struct ref *wants, struct oidset *common,
1177 int *haves_to_send, int *in_vain,
1178 int sideband_all, int seen_ack)
1179 {
1180 int ret = 0;
1181 struct strbuf req_buf = STRBUF_INIT;
1182
1183 if (server_supports_v2("fetch", 1))
1184 packet_buf_write(&req_buf, "command=fetch");
1185 if (server_supports_v2("agent", 0))
1186 packet_buf_write(&req_buf, "agent=%s", git_user_agent_sanitized());
1187 if (args->server_options && args->server_options->nr &&
1188 server_supports_v2("server-option", 1)) {
1189 int i;
1190 for (i = 0; i < args->server_options->nr; i++)
1191 packet_buf_write(&req_buf, "server-option=%s",
1192 args->server_options->items[i].string);
1193 }
1194
1195 packet_buf_delim(&req_buf);
1196 if (args->use_thin_pack)
1197 packet_buf_write(&req_buf, "thin-pack");
1198 if (args->no_progress)
1199 packet_buf_write(&req_buf, "no-progress");
1200 if (args->include_tag)
1201 packet_buf_write(&req_buf, "include-tag");
1202 if (prefer_ofs_delta)
1203 packet_buf_write(&req_buf, "ofs-delta");
1204 if (sideband_all)
1205 packet_buf_write(&req_buf, "sideband-all");
1206
1207 /* Add shallow-info and deepen request */
1208 if (server_supports_feature("fetch", "shallow", 0))
1209 add_shallow_requests(&req_buf, args);
1210 else if (is_repository_shallow(the_repository) || args->deepen)
1211 die(_("Server does not support shallow requests"));
1212
1213 /* Add filter */
1214 if (server_supports_feature("fetch", "filter", 0) &&
1215 args->filter_options.choice) {
1216 const char *spec =
1217 expand_list_objects_filter_spec(&args->filter_options);
1218 print_verbose(args, _("Server supports filter"));
1219 packet_buf_write(&req_buf, "filter %s", spec);
1220 } else if (args->filter_options.choice) {
1221 warning("filtering not recognized by server, ignoring");
1222 }
1223
1224 /* add wants */
1225 add_wants(args->no_dependents, wants, &req_buf);
1226
1227 if (args->no_dependents) {
1228 packet_buf_write(&req_buf, "done");
1229 ret = 1;
1230 } else {
1231 /* Add all of the common commits we've found in previous rounds */
1232 add_common(&req_buf, common);
1233
1234 /* Add initial haves */
1235 ret = add_haves(negotiator, seen_ack, &req_buf,
1236 haves_to_send, in_vain);
1237 }
1238
1239 /* Send request */
1240 packet_buf_flush(&req_buf);
1241 if (write_in_full(fd_out, req_buf.buf, req_buf.len) < 0)
1242 die_errno(_("unable to write request to remote"));
1243
1244 strbuf_release(&req_buf);
1245 return ret;
1246 }
1247
1248 /*
1249 * Processes a section header in a server's response and checks if it matches
1250 * `section`. If the value of `peek` is 1, the header line will be peeked (and
1251 * not consumed); if 0, the line will be consumed and the function will die if
1252 * the section header doesn't match what was expected.
1253 */
1254 static int process_section_header(struct packet_reader *reader,
1255 const char *section, int peek)
1256 {
1257 int ret;
1258
1259 if (packet_reader_peek(reader) != PACKET_READ_NORMAL)
1260 die(_("error reading section header '%s'"), section);
1261
1262 ret = !strcmp(reader->line, section);
1263
1264 if (!peek) {
1265 if (!ret)
1266 die(_("expected '%s', received '%s'"),
1267 section, reader->line);
1268 packet_reader_read(reader);
1269 }
1270
1271 return ret;
1272 }
1273
1274 enum common_found {
1275 /*
1276 * No commit was found to be possessed by both the client and the
1277 * server, and "ready" was not received.
1278 */
1279 NO_COMMON_FOUND,
1280
1281 /*
1282 * At least one commit was found to be possessed by both the client and
1283 * the server, and "ready" was not received.
1284 */
1285 COMMON_FOUND,
1286
1287 /*
1288 * "ready" was received, indicating that the server is ready to send
1289 * the packfile without any further negotiation.
1290 */
1291 READY
1292 };
1293
1294 static enum common_found process_acks(struct fetch_negotiator *negotiator,
1295 struct packet_reader *reader,
1296 struct oidset *common)
1297 {
1298 /* received */
1299 int received_ready = 0;
1300 int received_ack = 0;
1301
1302 process_section_header(reader, "acknowledgments", 0);
1303 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1304 const char *arg;
1305
1306 if (!strcmp(reader->line, "NAK"))
1307 continue;
1308
1309 if (skip_prefix(reader->line, "ACK ", &arg)) {
1310 struct object_id oid;
1311 received_ack = 1;
1312 if (!get_oid_hex(arg, &oid)) {
1313 struct commit *commit;
1314 oidset_insert(common, &oid);
1315 commit = lookup_commit(the_repository, &oid);
1316 if (negotiator)
1317 negotiator->ack(negotiator, commit);
1318 }
1319 continue;
1320 }
1321
1322 if (!strcmp(reader->line, "ready")) {
1323 received_ready = 1;
1324 continue;
1325 }
1326
1327 die(_("unexpected acknowledgment line: '%s'"), reader->line);
1328 }
1329
1330 if (reader->status != PACKET_READ_FLUSH &&
1331 reader->status != PACKET_READ_DELIM)
1332 die(_("error processing acks: %d"), reader->status);
1333
1334 /*
1335 * If an "acknowledgments" section is sent, a packfile is sent if and
1336 * only if "ready" was sent in this section. The other sections
1337 * ("shallow-info" and "wanted-refs") are sent only if a packfile is
1338 * sent. Therefore, a DELIM is expected if "ready" is sent, and a FLUSH
1339 * otherwise.
1340 */
1341 if (received_ready && reader->status != PACKET_READ_DELIM)
1342 die(_("expected packfile to be sent after 'ready'"));
1343 if (!received_ready && reader->status != PACKET_READ_FLUSH)
1344 die(_("expected no other sections to be sent after no 'ready'"));
1345
1346 return received_ready ? READY :
1347 (received_ack ? COMMON_FOUND : NO_COMMON_FOUND);
1348 }
1349
1350 static void receive_shallow_info(struct fetch_pack_args *args,
1351 struct packet_reader *reader,
1352 struct oid_array *shallows,
1353 struct shallow_info *si)
1354 {
1355 int unshallow_received = 0;
1356
1357 process_section_header(reader, "shallow-info", 0);
1358 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1359 const char *arg;
1360 struct object_id oid;
1361
1362 if (skip_prefix(reader->line, "shallow ", &arg)) {
1363 if (get_oid_hex(arg, &oid))
1364 die(_("invalid shallow line: %s"), reader->line);
1365 oid_array_append(shallows, &oid);
1366 continue;
1367 }
1368 if (skip_prefix(reader->line, "unshallow ", &arg)) {
1369 if (get_oid_hex(arg, &oid))
1370 die(_("invalid unshallow line: %s"), reader->line);
1371 if (!lookup_object(the_repository, &oid))
1372 die(_("object not found: %s"), reader->line);
1373 /* make sure that it is parsed as shallow */
1374 if (!parse_object(the_repository, &oid))
1375 die(_("error in object: %s"), reader->line);
1376 if (unregister_shallow(&oid))
1377 die(_("no shallow found: %s"), reader->line);
1378 unshallow_received = 1;
1379 continue;
1380 }
1381 die(_("expected shallow/unshallow, got %s"), reader->line);
1382 }
1383
1384 if (reader->status != PACKET_READ_FLUSH &&
1385 reader->status != PACKET_READ_DELIM)
1386 die(_("error processing shallow info: %d"), reader->status);
1387
1388 if (args->deepen || unshallow_received) {
1389 /*
1390 * Treat these as shallow lines caused by our depth settings.
1391 * In v0, these lines cannot cause refs to be rejected; do the
1392 * same.
1393 */
1394 int i;
1395
1396 for (i = 0; i < shallows->nr; i++)
1397 register_shallow(the_repository, &shallows->oid[i]);
1398 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
1399 NULL);
1400 args->deepen = 1;
1401 } else if (shallows->nr) {
1402 /*
1403 * Treat these as shallow lines caused by the remote being
1404 * shallow. In v0, remote refs that reach these objects are
1405 * rejected (unless --update-shallow is set); do the same.
1406 */
1407 prepare_shallow_info(si, shallows);
1408 if (si->nr_ours || si->nr_theirs)
1409 alternate_shallow_file =
1410 setup_temporary_shallow(si->shallow);
1411 else
1412 alternate_shallow_file = NULL;
1413 } else {
1414 alternate_shallow_file = NULL;
1415 }
1416 }
1417
1418 static int cmp_name_ref(const void *name, const void *ref)
1419 {
1420 return strcmp(name, (*(struct ref **)ref)->name);
1421 }
1422
1423 static void receive_wanted_refs(struct packet_reader *reader,
1424 struct ref **sought, int nr_sought)
1425 {
1426 process_section_header(reader, "wanted-refs", 0);
1427 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1428 struct object_id oid;
1429 const char *end;
1430 struct ref **found;
1431
1432 if (parse_oid_hex(reader->line, &oid, &end) || *end++ != ' ')
1433 die(_("expected wanted-ref, got '%s'"), reader->line);
1434
1435 found = bsearch(end, sought, nr_sought, sizeof(*sought),
1436 cmp_name_ref);
1437 if (!found)
1438 die(_("unexpected wanted-ref: '%s'"), reader->line);
1439 oidcpy(&(*found)->old_oid, &oid);
1440 }
1441
1442 if (reader->status != PACKET_READ_DELIM)
1443 die(_("error processing wanted refs: %d"), reader->status);
1444 }
1445
1446 enum fetch_state {
1447 FETCH_CHECK_LOCAL = 0,
1448 FETCH_SEND_REQUEST,
1449 FETCH_PROCESS_ACKS,
1450 FETCH_GET_PACK,
1451 FETCH_DONE,
1452 };
1453
1454 static void do_check_stateless_delimiter(const struct fetch_pack_args *args,
1455 struct packet_reader *reader)
1456 {
1457 check_stateless_delimiter(args->stateless_rpc, reader,
1458 _("git fetch-pack: expected response end packet"));
1459 }
1460
1461 static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
1462 int fd[2],
1463 const struct ref *orig_ref,
1464 struct ref **sought, int nr_sought,
1465 struct oid_array *shallows,
1466 struct shallow_info *si,
1467 char **pack_lockfile)
1468 {
1469 struct repository *r = the_repository;
1470 struct ref *ref = copy_ref_list(orig_ref);
1471 enum fetch_state state = FETCH_CHECK_LOCAL;
1472 struct oidset common = OIDSET_INIT;
1473 struct packet_reader reader;
1474 int in_vain = 0, negotiation_started = 0;
1475 int haves_to_send = INITIAL_FLUSH;
1476 struct fetch_negotiator negotiator_alloc;
1477 struct fetch_negotiator *negotiator;
1478 int seen_ack = 0;
1479
1480 if (args->no_dependents) {
1481 negotiator = NULL;
1482 } else {
1483 negotiator = &negotiator_alloc;
1484 fetch_negotiator_init(r, negotiator);
1485 }
1486
1487 packet_reader_init(&reader, fd[0], NULL, 0,
1488 PACKET_READ_CHOMP_NEWLINE |
1489 PACKET_READ_DIE_ON_ERR_PACKET);
1490 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 1) &&
1491 server_supports_feature("fetch", "sideband-all", 0)) {
1492 reader.use_sideband = 1;
1493 reader.me = "fetch-pack";
1494 }
1495
1496 while (state != FETCH_DONE) {
1497 switch (state) {
1498 case FETCH_CHECK_LOCAL:
1499 sort_ref_list(&ref, ref_compare_name);
1500 QSORT(sought, nr_sought, cmp_ref_by_name);
1501
1502 /* v2 supports these by default */
1503 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1504 use_sideband = 2;
1505 if (args->depth > 0 || args->deepen_since || args->deepen_not)
1506 args->deepen = 1;
1507
1508 /* Filter 'ref' by 'sought' and those that aren't local */
1509 if (!args->no_dependents) {
1510 mark_complete_and_common_ref(negotiator, args, &ref);
1511 filter_refs(args, &ref, sought, nr_sought);
1512 if (everything_local(args, &ref))
1513 state = FETCH_DONE;
1514 else
1515 state = FETCH_SEND_REQUEST;
1516
1517 mark_tips(negotiator, args->negotiation_tips);
1518 for_each_cached_alternate(negotiator,
1519 insert_one_alternate_object);
1520 } else {
1521 filter_refs(args, &ref, sought, nr_sought);
1522 state = FETCH_SEND_REQUEST;
1523 }
1524 break;
1525 case FETCH_SEND_REQUEST:
1526 if (!negotiation_started) {
1527 negotiation_started = 1;
1528 trace2_region_enter("fetch-pack",
1529 "negotiation_v2",
1530 the_repository);
1531 }
1532 if (send_fetch_request(negotiator, fd[1], args, ref,
1533 &common,
1534 &haves_to_send, &in_vain,
1535 reader.use_sideband,
1536 seen_ack))
1537 state = FETCH_GET_PACK;
1538 else
1539 state = FETCH_PROCESS_ACKS;
1540 break;
1541 case FETCH_PROCESS_ACKS:
1542 /* Process ACKs/NAKs */
1543 switch (process_acks(negotiator, &reader, &common)) {
1544 case READY:
1545 /*
1546 * Don't check for response delimiter; get_pack() will
1547 * read the rest of this response.
1548 */
1549 state = FETCH_GET_PACK;
1550 break;
1551 case COMMON_FOUND:
1552 in_vain = 0;
1553 seen_ack = 1;
1554 /* fallthrough */
1555 case NO_COMMON_FOUND:
1556 do_check_stateless_delimiter(args, &reader);
1557 state = FETCH_SEND_REQUEST;
1558 break;
1559 }
1560 break;
1561 case FETCH_GET_PACK:
1562 trace2_region_leave("fetch-pack",
1563 "negotiation_v2",
1564 the_repository);
1565 /* Check for shallow-info section */
1566 if (process_section_header(&reader, "shallow-info", 1))
1567 receive_shallow_info(args, &reader, shallows, si);
1568
1569 if (process_section_header(&reader, "wanted-refs", 1))
1570 receive_wanted_refs(&reader, sought, nr_sought);
1571
1572 /* get the pack */
1573 process_section_header(&reader, "packfile", 0);
1574 if (get_pack(args, fd, pack_lockfile, sought, nr_sought))
1575 die(_("git fetch-pack: fetch failed."));
1576 do_check_stateless_delimiter(args, &reader);
1577
1578 state = FETCH_DONE;
1579 break;
1580 case FETCH_DONE:
1581 continue;
1582 }
1583 }
1584
1585 if (negotiator)
1586 negotiator->release(negotiator);
1587 oidset_clear(&common);
1588 return ref;
1589 }
1590
1591 static int fetch_pack_config_cb(const char *var, const char *value, void *cb)
1592 {
1593 if (strcmp(var, "fetch.fsck.skiplist") == 0) {
1594 const char *path;
1595
1596 if (git_config_pathname(&path, var, value))
1597 return 1;
1598 strbuf_addf(&fsck_msg_types, "%cskiplist=%s",
1599 fsck_msg_types.len ? ',' : '=', path);
1600 free((char *)path);
1601 return 0;
1602 }
1603
1604 if (skip_prefix(var, "fetch.fsck.", &var)) {
1605 if (is_valid_msg_type(var, value))
1606 strbuf_addf(&fsck_msg_types, "%c%s=%s",
1607 fsck_msg_types.len ? ',' : '=', var, value);
1608 else
1609 warning("Skipping unknown msg id '%s'", var);
1610 return 0;
1611 }
1612
1613 return git_default_config(var, value, cb);
1614 }
1615
1616 static void fetch_pack_config(void)
1617 {
1618 git_config_get_int("fetch.unpacklimit", &fetch_unpack_limit);
1619 git_config_get_int("transfer.unpacklimit", &transfer_unpack_limit);
1620 git_config_get_bool("repack.usedeltabaseoffset", &prefer_ofs_delta);
1621 git_config_get_bool("fetch.fsckobjects", &fetch_fsck_objects);
1622 git_config_get_bool("transfer.fsckobjects", &transfer_fsck_objects);
1623
1624 git_config(fetch_pack_config_cb, NULL);
1625 }
1626
1627 static void fetch_pack_setup(void)
1628 {
1629 static int did_setup;
1630 if (did_setup)
1631 return;
1632 fetch_pack_config();
1633 if (0 <= transfer_unpack_limit)
1634 unpack_limit = transfer_unpack_limit;
1635 else if (0 <= fetch_unpack_limit)
1636 unpack_limit = fetch_unpack_limit;
1637 did_setup = 1;
1638 }
1639
1640 static int remove_duplicates_in_refs(struct ref **ref, int nr)
1641 {
1642 struct string_list names = STRING_LIST_INIT_NODUP;
1643 int src, dst;
1644
1645 for (src = dst = 0; src < nr; src++) {
1646 struct string_list_item *item;
1647 item = string_list_insert(&names, ref[src]->name);
1648 if (item->util)
1649 continue; /* already have it */
1650 item->util = ref[src];
1651 if (src != dst)
1652 ref[dst] = ref[src];
1653 dst++;
1654 }
1655 for (src = dst; src < nr; src++)
1656 ref[src] = NULL;
1657 string_list_clear(&names, 0);
1658 return dst;
1659 }
1660
1661 static void update_shallow(struct fetch_pack_args *args,
1662 struct ref **sought, int nr_sought,
1663 struct shallow_info *si)
1664 {
1665 struct oid_array ref = OID_ARRAY_INIT;
1666 int *status;
1667 int i;
1668
1669 if (args->deepen && alternate_shallow_file) {
1670 if (*alternate_shallow_file == '\0') { /* --unshallow */
1671 unlink_or_warn(git_path_shallow(the_repository));
1672 rollback_shallow_file(the_repository, &shallow_lock);
1673 } else
1674 commit_shallow_file(the_repository, &shallow_lock);
1675 alternate_shallow_file = NULL;
1676 return;
1677 }
1678
1679 if (!si->shallow || !si->shallow->nr)
1680 return;
1681
1682 if (args->cloning) {
1683 /*
1684 * remote is shallow, but this is a clone, there are
1685 * no objects in repo to worry about. Accept any
1686 * shallow points that exist in the pack (iow in repo
1687 * after get_pack() and reprepare_packed_git())
1688 */
1689 struct oid_array extra = OID_ARRAY_INIT;
1690 struct object_id *oid = si->shallow->oid;
1691 for (i = 0; i < si->shallow->nr; i++)
1692 if (has_object_file(&oid[i]))
1693 oid_array_append(&extra, &oid[i]);
1694 if (extra.nr) {
1695 setup_alternate_shallow(&shallow_lock,
1696 &alternate_shallow_file,
1697 &extra);
1698 commit_shallow_file(the_repository, &shallow_lock);
1699 alternate_shallow_file = NULL;
1700 }
1701 oid_array_clear(&extra);
1702 return;
1703 }
1704
1705 if (!si->nr_ours && !si->nr_theirs)
1706 return;
1707
1708 remove_nonexistent_theirs_shallow(si);
1709 if (!si->nr_ours && !si->nr_theirs)
1710 return;
1711 for (i = 0; i < nr_sought; i++)
1712 oid_array_append(&ref, &sought[i]->old_oid);
1713 si->ref = &ref;
1714
1715 if (args->update_shallow) {
1716 /*
1717 * remote is also shallow, .git/shallow may be updated
1718 * so all refs can be accepted. Make sure we only add
1719 * shallow roots that are actually reachable from new
1720 * refs.
1721 */
1722 struct oid_array extra = OID_ARRAY_INIT;
1723 struct object_id *oid = si->shallow->oid;
1724 assign_shallow_commits_to_refs(si, NULL, NULL);
1725 if (!si->nr_ours && !si->nr_theirs) {
1726 oid_array_clear(&ref);
1727 return;
1728 }
1729 for (i = 0; i < si->nr_ours; i++)
1730 oid_array_append(&extra, &oid[si->ours[i]]);
1731 for (i = 0; i < si->nr_theirs; i++)
1732 oid_array_append(&extra, &oid[si->theirs[i]]);
1733 setup_alternate_shallow(&shallow_lock,
1734 &alternate_shallow_file,
1735 &extra);
1736 commit_shallow_file(the_repository, &shallow_lock);
1737 oid_array_clear(&extra);
1738 oid_array_clear(&ref);
1739 alternate_shallow_file = NULL;
1740 return;
1741 }
1742
1743 /*
1744 * remote is also shallow, check what ref is safe to update
1745 * without updating .git/shallow
1746 */
1747 status = xcalloc(nr_sought, sizeof(*status));
1748 assign_shallow_commits_to_refs(si, NULL, status);
1749 if (si->nr_ours || si->nr_theirs) {
1750 for (i = 0; i < nr_sought; i++)
1751 if (status[i])
1752 sought[i]->status = REF_STATUS_REJECT_SHALLOW;
1753 }
1754 free(status);
1755 oid_array_clear(&ref);
1756 }
1757
1758 static int iterate_ref_map(void *cb_data, struct object_id *oid)
1759 {
1760 struct ref **rm = cb_data;
1761 struct ref *ref = *rm;
1762
1763 if (!ref)
1764 return -1; /* end of the list */
1765 *rm = ref->next;
1766 oidcpy(oid, &ref->old_oid);
1767 return 0;
1768 }
1769
1770 struct ref *fetch_pack(struct fetch_pack_args *args,
1771 int fd[],
1772 const struct ref *ref,
1773 struct ref **sought, int nr_sought,
1774 struct oid_array *shallow,
1775 char **pack_lockfile,
1776 enum protocol_version version)
1777 {
1778 struct ref *ref_cpy;
1779 struct shallow_info si;
1780 struct oid_array shallows_scratch = OID_ARRAY_INIT;
1781
1782 fetch_pack_setup();
1783 if (nr_sought)
1784 nr_sought = remove_duplicates_in_refs(sought, nr_sought);
1785
1786 if (args->no_dependents && !args->filter_options.choice) {
1787 /*
1788 * The protocol does not support requesting that only the
1789 * wanted objects be sent, so approximate this by setting a
1790 * "blob:none" filter if no filter is already set. This works
1791 * for all object types: note that wanted blobs will still be
1792 * sent because they are directly specified as a "want".
1793 *
1794 * NEEDSWORK: Add an option in the protocol to request that
1795 * only the wanted objects be sent, and implement it.
1796 */
1797 parse_list_objects_filter(&args->filter_options, "blob:none");
1798 }
1799
1800 if (version != protocol_v2 && !ref) {
1801 packet_flush(fd[1]);
1802 die(_("no matching remote head"));
1803 }
1804 if (version == protocol_v2) {
1805 if (shallow->nr)
1806 BUG("Protocol V2 does not provide shallows at this point in the fetch");
1807 memset(&si, 0, sizeof(si));
1808 ref_cpy = do_fetch_pack_v2(args, fd, ref, sought, nr_sought,
1809 &shallows_scratch, &si,
1810 pack_lockfile);
1811 } else {
1812 prepare_shallow_info(&si, shallow);
1813 ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought,
1814 &si, pack_lockfile);
1815 }
1816 reprepare_packed_git(the_repository);
1817
1818 if (!args->cloning && args->deepen) {
1819 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1820 struct ref *iterator = ref_cpy;
1821 opt.shallow_file = alternate_shallow_file;
1822 if (args->deepen)
1823 opt.is_deepening_fetch = 1;
1824 if (check_connected(iterate_ref_map, &iterator, &opt)) {
1825 error(_("remote did not send all necessary objects"));
1826 free_refs(ref_cpy);
1827 ref_cpy = NULL;
1828 rollback_shallow_file(the_repository, &shallow_lock);
1829 goto cleanup;
1830 }
1831 args->connectivity_checked = 1;
1832 }
1833
1834 update_shallow(args, sought, nr_sought, &si);
1835 cleanup:
1836 clear_shallow_info(&si);
1837 oid_array_clear(&shallows_scratch);
1838 return ref_cpy;
1839 }
1840
1841 int report_unmatched_refs(struct ref **sought, int nr_sought)
1842 {
1843 int i, ret = 0;
1844
1845 for (i = 0; i < nr_sought; i++) {
1846 if (!sought[i])
1847 continue;
1848 switch (sought[i]->match_status) {
1849 case REF_MATCHED:
1850 continue;
1851 case REF_NOT_MATCHED:
1852 error(_("no such remote ref %s"), sought[i]->name);
1853 break;
1854 case REF_UNADVERTISED_NOT_ALLOWED:
1855 error(_("Server does not allow request for unadvertised object %s"),
1856 sought[i]->name);
1857 break;
1858 }
1859 ret = 1;
1860 }
1861 return ret;
1862 }
git for Debian