Sync with Git 2.20.1
[git/git.git] / fetch-pack.c
CommitLineData
745f7a8c 1#include "cache.h"
a49d2834 2#include "repository.h"
b2141fc1 3#include "config.h"
697cc8ef 4#include "lockfile.h"
745f7a8c
NTND
5#include "refs.h"
6#include "pkt-line.h"
7#include "commit.h"
8#include "tag.h"
d807c4a0 9#include "exec-cmd.h"
745f7a8c
NTND
10#include "pack.h"
11#include "sideband.h"
12#include "fetch-pack.h"
13#include "remote.h"
14#include "run-command.h"
47a59185 15#include "connect.h"
745f7a8c
NTND
16#include "transport.h"
17#include "version.h"
beea4152 18#include "sha1-array.h"
fdb69d33 19#include "oidset.h"
0abe14f6 20#include "packfile.h"
cbd53a21 21#include "object-store.h"
cf1e7c07 22#include "connected.h"
ec062838 23#include "fetch-negotiator.h"
1362df0d 24#include "fsck.h"
745f7a8c
NTND
25
26static int transfer_unpack_limit = -1;
27static int fetch_unpack_limit = -1;
28static int unpack_limit = 100;
29static int prefer_ofs_delta = 1;
30static int no_done;
508ea882 31static int deepen_since_ok;
a45a2600 32static int deepen_not_ok;
745f7a8c
NTND
33static int fetch_fsck_objects = -1;
34static int transfer_fsck_objects = -1;
35static int agent_supported;
640d8b72 36static int server_supports_filtering;
6035d6aa
NTND
37static struct lock_file shallow_lock;
38static const char *alternate_shallow_file;
42cc7485 39static char *negotiation_algorithm;
1362df0d 40static struct strbuf fsck_msg_types = STRBUF_INIT;
745f7a8c 41
208acbfb 42/* Remember to update object flag allocation in object.h */
745f7a8c 43#define COMPLETE (1U << 0)
ec062838 44#define ALTERNATE (1U << 1)
745f7a8c
NTND
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
d30fe89c 52static int multi_ack, use_sideband;
7199c093
FM
53/* Allow specifying sha1 if it is a ref tip. */
54#define ALLOW_TIP_SHA1 01
68ee6289
FM
55/* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
56#define ALLOW_REACHABLE_SHA1 02
7199c093 57static unsigned int allow_unadvertised_object_request;
745f7a8c 58
0d789a5b
NTND
59__attribute__((format (printf, 2, 3)))
60static 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
41a078c6
JK
74struct alternate_object_cache {
75 struct object **items;
76 size_t nr, alloc;
77};
78
bdf4276c 79static void cache_one_alternate(const struct object_id *oid,
41a078c6
JK
80 void *vcache)
81{
82 struct alternate_object_cache *cache = vcache;
109cd76d 83 struct object *obj = parse_object(the_repository, oid);
41a078c6
JK
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
ec062838
JT
93static void for_each_cached_alternate(struct fetch_negotiator *negotiator,
94 void (*cb)(struct fetch_negotiator *,
d30fe89c 95 struct object *))
41a078c6
JK
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++)
ec062838 107 cb(negotiator, cache.items[i]);
745f7a8c
NTND
108}
109
ec062838 110static int rev_list_insert_ref(struct fetch_negotiator *negotiator,
d30fe89c
JT
111 const char *refname,
112 const struct object_id *oid)
745f7a8c 113{
a74093da
SB
114 struct object *o = deref_tag(the_repository,
115 parse_object(the_repository, oid),
109cd76d 116 refname, 0);
745f7a8c
NTND
117
118 if (o && o->type == OBJ_COMMIT)
ec062838 119 negotiator->add_tip(negotiator, (struct commit *)o);
745f7a8c
NTND
120
121 return 0;
122}
123
b1b49c6e
MH
124static int rev_list_insert_ref_oid(const char *refname, const struct object_id *oid,
125 int flag, void *cb_data)
745f7a8c 126{
d30fe89c 127 return rev_list_insert_ref(cb_data, refname, oid);
745f7a8c
NTND
128}
129
130enum ack_type {
131 NAK = 0,
132 ACK,
133 ACK_continue,
134 ACK_common,
135 ACK_ready
136};
137
138static void consume_shallow_list(struct fetch_pack_args *args, int fd)
139{
79891cb9 140 if (args->stateless_rpc && args->deepen) {
745f7a8c
NTND
141 /* If we sent a depth we will get back "duplicate"
142 * shallow and unshallow commands every time there
143 * is a block of have lines exchanged.
144 */
74543a04
JK
145 char *line;
146 while ((line = packet_read_line(fd, NULL))) {
59556548 147 if (starts_with(line, "shallow "))
745f7a8c 148 continue;
59556548 149 if (starts_with(line, "unshallow "))
745f7a8c 150 continue;
1dd73e20 151 die(_("git fetch-pack: expected shallow list"));
745f7a8c
NTND
152 }
153 }
154}
155
1b283377 156static enum ack_type get_ack(int fd, struct object_id *result_oid)
745f7a8c 157{
74543a04
JK
158 int len;
159 char *line = packet_read_line(fd, &len);
82e56767 160 const char *arg;
745f7a8c 161
bc9d4dc5
JK
162 if (!line)
163 die(_("git fetch-pack: expected ACK/NAK, got a flush packet"));
745f7a8c
NTND
164 if (!strcmp(line, "NAK"))
165 return NAK;
82e56767 166 if (skip_prefix(line, "ACK ", &arg)) {
1b283377 167 if (!get_oid_hex(arg, result_oid)) {
82e56767
JK
168 arg += 40;
169 len -= arg - line;
170 if (len < 1)
030e9dd6 171 return ACK;
82e56767 172 if (strstr(arg, "continue"))
745f7a8c 173 return ACK_continue;
82e56767 174 if (strstr(arg, "common"))
745f7a8c 175 return ACK_common;
82e56767 176 if (strstr(arg, "ready"))
745f7a8c
NTND
177 return ACK_ready;
178 return ACK;
179 }
180 }
8e2c7bef
JT
181 if (skip_prefix(line, "ERR ", &arg))
182 die(_("remote error: %s"), arg);
dfbfb9f3 183 die(_("git fetch-pack: expected ACK/NAK, got '%s'"), line);
745f7a8c
NTND
184}
185
186static void send_request(struct fetch_pack_args *args,
187 int fd, struct strbuf *buf)
188{
189 if (args->stateless_rpc) {
190 send_sideband(fd, -1, buf->buf, buf->len, LARGE_PACKET_MAX);
191 packet_flush(fd);
192 } else
cdf4fb8e 193 write_or_die(fd, buf->buf, buf->len);
745f7a8c
NTND
194}
195
ec062838 196static void insert_one_alternate_object(struct fetch_negotiator *negotiator,
d30fe89c 197 struct object *obj)
745f7a8c 198{
ec062838 199 rev_list_insert_ref(negotiator, NULL, &obj->oid);
745f7a8c
NTND
200}
201
202#define INITIAL_FLUSH 16
203#define PIPESAFE_FLUSH 32
da470981 204#define LARGE_FLUSH 16384
745f7a8c 205
685fbd32 206static int next_flush(int stateless_rpc, int count)
745f7a8c 207{
685fbd32 208 if (stateless_rpc) {
da470981
JT
209 if (count < LARGE_FLUSH)
210 count <<= 1;
211 else
212 count = count * 11 / 10;
213 } else {
214 if (count < PIPESAFE_FLUSH)
215 count <<= 1;
216 else
217 count += PIPESAFE_FLUSH;
218 }
745f7a8c
NTND
219 return count;
220}
221
3390e42a
JT
222static void mark_tips(struct fetch_negotiator *negotiator,
223 const struct oid_array *negotiation_tips)
224{
225 int i;
226
227 if (!negotiation_tips) {
228 for_each_ref(rev_list_insert_ref_oid, negotiator);
229 return;
230 }
231
232 for (i = 0; i < negotiation_tips->nr; i++)
233 rev_list_insert_ref(negotiator, NULL,
234 &negotiation_tips->oid[i]);
235 return;
236}
237
ec062838 238static int find_common(struct fetch_negotiator *negotiator,
d30fe89c 239 struct fetch_pack_args *args,
1b283377 240 int fd[2], struct object_id *result_oid,
745f7a8c
NTND
241 struct ref *refs)
242{
243 int fetching;
244 int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval;
1b283377 245 const struct object_id *oid;
745f7a8c
NTND
246 unsigned in_vain = 0;
247 int got_continue = 0;
248 int got_ready = 0;
249 struct strbuf req_buf = STRBUF_INIT;
250 size_t state_len = 0;
251
252 if (args->stateless_rpc && multi_ack == 1)
1dd73e20 253 die(_("--stateless-rpc requires multi_ack_detailed"));
745f7a8c 254
12f19a98
JT
255 if (!args->no_dependents) {
256 mark_tips(negotiator, args->negotiation_tips);
257 for_each_cached_alternate(negotiator, insert_one_alternate_object);
258 }
745f7a8c
NTND
259
260 fetching = 0;
261 for ( ; refs ; refs = refs->next) {
1b283377 262 struct object_id *remote = &refs->old_oid;
745f7a8c
NTND
263 const char *remote_hex;
264 struct object *o;
265
266 /*
267 * If that object is complete (i.e. it is an ancestor of a
268 * local ref), we tell them we have it but do not have to
269 * tell them about its ancestors, which they already know
270 * about.
271 *
272 * We use lookup_object here because we are only
273 * interested in the case we *know* the object is
274 * reachable and we have already scanned it.
12f19a98
JT
275 *
276 * Do this only if args->no_dependents is false (if it is true,
277 * we cannot trust the object flags).
745f7a8c 278 */
12f19a98
JT
279 if (!args->no_dependents &&
280 ((o = lookup_object(the_repository, remote->hash)) != NULL) &&
745f7a8c
NTND
281 (o->flags & COMPLETE)) {
282 continue;
283 }
284
1b283377 285 remote_hex = oid_to_hex(remote);
745f7a8c
NTND
286 if (!fetching) {
287 struct strbuf c = STRBUF_INIT;
288 if (multi_ack == 2) strbuf_addstr(&c, " multi_ack_detailed");
289 if (multi_ack == 1) strbuf_addstr(&c, " multi_ack");
290 if (no_done) strbuf_addstr(&c, " no-done");
291 if (use_sideband == 2) strbuf_addstr(&c, " side-band-64k");
292 if (use_sideband == 1) strbuf_addstr(&c, " side-band");
cccf74e2 293 if (args->deepen_relative) strbuf_addstr(&c, " deepen-relative");
745f7a8c
NTND
294 if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack");
295 if (args->no_progress) strbuf_addstr(&c, " no-progress");
296 if (args->include_tag) strbuf_addstr(&c, " include-tag");
297 if (prefer_ofs_delta) strbuf_addstr(&c, " ofs-delta");
508ea882 298 if (deepen_since_ok) strbuf_addstr(&c, " deepen-since");
a45a2600 299 if (deepen_not_ok) strbuf_addstr(&c, " deepen-not");
745f7a8c
NTND
300 if (agent_supported) strbuf_addf(&c, " agent=%s",
301 git_user_agent_sanitized());
640d8b72
JH
302 if (args->filter_options.choice)
303 strbuf_addstr(&c, " filter");
745f7a8c
NTND
304 packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
305 strbuf_release(&c);
306 } else
307 packet_buf_write(&req_buf, "want %s\n", remote_hex);
308 fetching++;
309 }
310
311 if (!fetching) {
312 strbuf_release(&req_buf);
313 packet_flush(fd[1]);
314 return 1;
315 }
316
c8813487 317 if (is_repository_shallow(the_repository))
1a30f5a2 318 write_shallow_commits(&req_buf, 1, NULL);
745f7a8c
NTND
319 if (args->depth > 0)
320 packet_buf_write(&req_buf, "deepen %d", args->depth);
508ea882 321 if (args->deepen_since) {
dddbad72 322 timestamp_t max_age = approxidate(args->deepen_since);
cb71f8bd 323 packet_buf_write(&req_buf, "deepen-since %"PRItime, max_age);
508ea882 324 }
a45a2600
NTND
325 if (args->deepen_not) {
326 int i;
327 for (i = 0; i < args->deepen_not->nr; i++) {
328 struct string_list_item *s = args->deepen_not->items + i;
329 packet_buf_write(&req_buf, "deepen-not %s", s->string);
330 }
331 }
640d8b72
JH
332 if (server_supports_filtering && args->filter_options.choice)
333 packet_buf_write(&req_buf, "filter %s",
334 args->filter_options.filter_spec);
745f7a8c
NTND
335 packet_buf_flush(&req_buf);
336 state_len = req_buf.len;
337
79891cb9 338 if (args->deepen) {
74543a04 339 char *line;
ae021d87 340 const char *arg;
1b283377 341 struct object_id oid;
745f7a8c
NTND
342
343 send_request(args, fd[1], &req_buf);
74543a04 344 while ((line = packet_read_line(fd[0], NULL))) {
ae021d87 345 if (skip_prefix(line, "shallow ", &arg)) {
1b283377 346 if (get_oid_hex(arg, &oid))
1dd73e20 347 die(_("invalid shallow line: %s"), line);
19143f13 348 register_shallow(the_repository, &oid);
745f7a8c
NTND
349 continue;
350 }
ae021d87 351 if (skip_prefix(line, "unshallow ", &arg)) {
1b283377 352 if (get_oid_hex(arg, &oid))
1dd73e20 353 die(_("invalid unshallow line: %s"), line);
5abddd1e 354 if (!lookup_object(the_repository, oid.hash))
1dd73e20 355 die(_("object not found: %s"), line);
745f7a8c 356 /* make sure that it is parsed as shallow */
109cd76d 357 if (!parse_object(the_repository, &oid))
1dd73e20 358 die(_("error in object: %s"), line);
e92b848c 359 if (unregister_shallow(&oid))
1dd73e20 360 die(_("no shallow found: %s"), line);
745f7a8c
NTND
361 continue;
362 }
1dd73e20 363 die(_("expected shallow/unshallow, got %s"), line);
745f7a8c
NTND
364 }
365 } else if (!args->stateless_rpc)
366 send_request(args, fd[1], &req_buf);
367
368 if (!args->stateless_rpc) {
369 /* If we aren't using the stateless-rpc interface
370 * we don't need to retain the headers.
371 */
372 strbuf_setlen(&req_buf, 0);
373 state_len = 0;
374 }
375
376 flushes = 0;
377 retval = -1;
88e2f9ed
JT
378 if (args->no_dependents)
379 goto done;
ec062838 380 while ((oid = negotiator->next(negotiator))) {
1b283377 381 packet_buf_write(&req_buf, "have %s\n", oid_to_hex(oid));
382 print_verbose(args, "have %s", oid_to_hex(oid));
745f7a8c
NTND
383 in_vain++;
384 if (flush_at <= ++count) {
385 int ack;
386
387 packet_buf_flush(&req_buf);
388 send_request(args, fd[1], &req_buf);
389 strbuf_setlen(&req_buf, state_len);
390 flushes++;
685fbd32 391 flush_at = next_flush(args->stateless_rpc, count);
745f7a8c
NTND
392
393 /*
394 * We keep one window "ahead" of the other side, and
395 * will wait for an ACK only on the next one
396 */
397 if (!args->stateless_rpc && count == INITIAL_FLUSH)
398 continue;
399
400 consume_shallow_list(args, fd[0]);
401 do {
1b283377 402 ack = get_ack(fd[0], result_oid);
0d789a5b 403 if (ack)
1dd73e20 404 print_verbose(args, _("got %s %d %s"), "ack",
1b283377 405 ack, oid_to_hex(result_oid));
745f7a8c
NTND
406 switch (ack) {
407 case ACK:
408 flushes = 0;
409 multi_ack = 0;
410 retval = 0;
411 goto done;
412 case ACK_common:
413 case ACK_ready:
414 case ACK_continue: {
415 struct commit *commit =
c1f5eb49
SB
416 lookup_commit(the_repository,
417 result_oid);
d093bc75 418 int was_common;
3a2a1dc1 419
745f7a8c 420 if (!commit)
1b283377 421 die(_("invalid commit %s"), oid_to_hex(result_oid));
ec062838 422 was_common = negotiator->ack(negotiator, commit);
745f7a8c
NTND
423 if (args->stateless_rpc
424 && ack == ACK_common
d093bc75 425 && !was_common) {
745f7a8c
NTND
426 /* We need to replay the have for this object
427 * on the next RPC request so the peer knows
428 * it is in common with us.
429 */
1b283377 430 const char *hex = oid_to_hex(result_oid);
745f7a8c
NTND
431 packet_buf_write(&req_buf, "have %s\n", hex);
432 state_len = req_buf.len;
06b3d386
JT
433 /*
434 * Reset in_vain because an ack
435 * for this commit has not been
436 * seen.
437 */
438 in_vain = 0;
439 } else if (!args->stateless_rpc
440 || ack != ACK_common)
441 in_vain = 0;
745f7a8c 442 retval = 0;
745f7a8c 443 got_continue = 1;
21bcf6e4 444 if (ack == ACK_ready)
745f7a8c 445 got_ready = 1;
745f7a8c
NTND
446 break;
447 }
448 }
449 } while (ack);
450 flushes--;
451 if (got_continue && MAX_IN_VAIN < in_vain) {
1dd73e20 452 print_verbose(args, _("giving up"));
745f7a8c
NTND
453 break; /* give up */
454 }
21bcf6e4
JT
455 if (got_ready)
456 break;
745f7a8c
NTND
457 }
458 }
459done:
460 if (!got_ready || !no_done) {
461 packet_buf_write(&req_buf, "done\n");
462 send_request(args, fd[1], &req_buf);
463 }
1dd73e20 464 print_verbose(args, _("done"));
745f7a8c
NTND
465 if (retval != 0) {
466 multi_ack = 0;
467 flushes++;
468 }
469 strbuf_release(&req_buf);
470
ff62eca7
NTND
471 if (!got_ready || !no_done)
472 consume_shallow_list(args, fd[0]);
745f7a8c 473 while (flushes || multi_ack) {
1b283377 474 int ack = get_ack(fd[0], result_oid);
745f7a8c 475 if (ack) {
1dd73e20 476 print_verbose(args, _("got %s (%d) %s"), "ack",
1b283377 477 ack, oid_to_hex(result_oid));
745f7a8c
NTND
478 if (ack == ACK)
479 return 0;
480 multi_ack = 1;
481 continue;
482 }
483 flushes--;
484 }
485 /* it is no error to fetch into a completely empty repo */
486 return count ? retval : 0;
487}
488
489static struct commit_list *complete;
490
1b283377 491static int mark_complete(const struct object_id *oid)
745f7a8c 492{
109cd76d 493 struct object *o = parse_object(the_repository, oid);
745f7a8c
NTND
494
495 while (o && o->type == OBJ_TAG) {
496 struct tag *t = (struct tag *) o;
497 if (!t->tagged)
498 break; /* broken repository */
499 o->flags |= COMPLETE;
109cd76d 500 o = parse_object(the_repository, &t->tagged->oid);
745f7a8c
NTND
501 }
502 if (o && o->type == OBJ_COMMIT) {
503 struct commit *commit = (struct commit *)o;
504 if (!(commit->object.flags & COMPLETE)) {
505 commit->object.flags |= COMPLETE;
16445242 506 commit_list_insert(commit, &complete);
745f7a8c
NTND
507 }
508 }
509 return 0;
510}
511
f8ee4d85
MH
512static int mark_complete_oid(const char *refname, const struct object_id *oid,
513 int flag, void *cb_data)
514{
1b283377 515 return mark_complete(oid);
f8ee4d85
MH
516}
517
745f7a8c 518static void mark_recent_complete_commits(struct fetch_pack_args *args,
dddbad72 519 timestamp_t cutoff)
745f7a8c
NTND
520{
521 while (complete && cutoff <= complete->item->date) {
1dd73e20 522 print_verbose(args, _("Marking %s as complete"),
0d789a5b 523 oid_to_hex(&complete->item->object.oid));
745f7a8c
NTND
524 pop_most_recent_commit(&complete, COMPLETE);
525 }
526}
527
fdb69d33
JT
528static void add_refs_to_oidset(struct oidset *oids, struct ref *refs)
529{
530 for (; refs; refs = refs->next)
531 oidset_insert(oids, &refs->old_oid);
532}
533
bf73282c
RS
534static int is_unmatched_ref(const struct ref *ref)
535{
536 struct object_id oid;
537 const char *p;
538 return ref->match_status == REF_NOT_MATCHED &&
539 !parse_oid_hex(ref->name, &oid, &p) &&
540 *p == '\0' &&
541 oideq(&oid, &ref->old_oid);
542}
543
745f7a8c 544static void filter_refs(struct fetch_pack_args *args,
f2db854d
JH
545 struct ref **refs,
546 struct ref **sought, int nr_sought)
745f7a8c
NTND
547{
548 struct ref *newlist = NULL;
549 struct ref **newtail = &newlist;
fdb69d33 550 struct ref *unmatched = NULL;
745f7a8c 551 struct ref *ref, *next;
fdb69d33 552 struct oidset tip_oids = OIDSET_INIT;
f2db854d 553 int i;
22a16465
RS
554 int strict = !(allow_unadvertised_object_request &
555 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
745f7a8c 556
f2db854d 557 i = 0;
745f7a8c
NTND
558 for (ref = *refs; ref; ref = next) {
559 int keep = 0;
560 next = ref->next;
f2db854d 561
50e19a83 562 if (starts_with(ref->name, "refs/") &&
4c224081 563 check_refname_format(ref->name, 0))
745f7a8c
NTND
564 ; /* trash */
565 else {
f2db854d
JH
566 while (i < nr_sought) {
567 int cmp = strcmp(ref->name, sought[i]->name);
745f7a8c
NTND
568 if (cmp < 0)
569 break; /* definitely do not have it */
570 else if (cmp == 0) {
571 keep = 1; /* definitely have it */
d56583de 572 sought[i]->match_status = REF_MATCHED;
745f7a8c 573 }
f2db854d 574 i++;
745f7a8c 575 }
745f7a8c 576
e9502c0a
JK
577 if (!keep && args->fetch_all &&
578 (!args->deepen || !starts_with(ref->name, "refs/tags/")))
579 keep = 1;
580 }
745f7a8c
NTND
581
582 if (keep) {
583 *newtail = ref;
584 ref->next = NULL;
585 newtail = &ref->next;
586 } else {
fdb69d33
JT
587 ref->next = unmatched;
588 unmatched = ref;
745f7a8c
NTND
589 }
590 }
591
22a16465
RS
592 if (strict) {
593 for (i = 0; i < nr_sought; i++) {
594 ref = sought[i];
595 if (!is_unmatched_ref(ref))
596 continue;
597
598 add_refs_to_oidset(&tip_oids, unmatched);
599 add_refs_to_oidset(&tip_oids, newlist);
600 break;
601 }
602 }
603
6e7b66ee 604 /* Append unmatched requests to the list */
d56583de 605 for (i = 0; i < nr_sought; i++) {
d56583de 606 ref = sought[i];
bf73282c 607 if (!is_unmatched_ref(ref))
d56583de 608 continue;
6e7b66ee 609
22a16465 610 if (!strict || oidset_contains(&tip_oids, &ref->old_oid)) {
d56583de 611 ref->match_status = REF_MATCHED;
c3c17bf1
JK
612 *newtail = copy_ref(ref);
613 newtail = &(*newtail)->next;
d56583de
MM
614 } else {
615 ref->match_status = REF_UNADVERTISED_NOT_ALLOWED;
6e7b66ee
JH
616 }
617 }
fdb69d33
JT
618
619 oidset_clear(&tip_oids);
620 for (ref = unmatched; ref; ref = next) {
621 next = ref->next;
622 free(ref);
623 }
624
745f7a8c
NTND
625 *refs = newlist;
626}
627
ec062838 628static void mark_alternate_complete(struct fetch_negotiator *unused,
d30fe89c 629 struct object *obj)
745f7a8c 630{
1b283377 631 mark_complete(&obj->oid);
745f7a8c
NTND
632}
633
024aa469
TI
634struct loose_object_iter {
635 struct oidset *loose_object_set;
636 struct ref *refs;
637};
638
639/*
640 * If the number of refs is not larger than the number of loose objects,
641 * this function stops inserting.
642 */
643static int add_loose_objects_to_set(const struct object_id *oid,
644 const char *path,
645 void *data)
646{
647 struct loose_object_iter *iter = data;
648 oidset_insert(iter->loose_object_set, oid);
649 if (iter->refs == NULL)
650 return 1;
651
652 iter->refs = iter->refs->next;
653 return 0;
654}
655
34c29034
JT
656/*
657 * Mark recent commits available locally and reachable from a local ref as
658 * COMPLETE. If args->no_dependents is false, also mark COMPLETE remote refs as
659 * COMMON_REF (otherwise, we are not planning to participate in negotiation, and
660 * thus do not need COMMON_REF marks).
661 *
662 * The cutoff time for recency is determined by this heuristic: it is the
663 * earliest commit time of the objects in refs that are commits and that we know
664 * the commit time of.
665 */
ec062838 666static void mark_complete_and_common_ref(struct fetch_negotiator *negotiator,
d30fe89c 667 struct fetch_pack_args *args,
34c29034 668 struct ref **refs)
745f7a8c
NTND
669{
670 struct ref *ref;
a1c6d7c1 671 int old_save_commit_buffer = save_commit_buffer;
dddbad72 672 timestamp_t cutoff = 0;
024aa469
TI
673 struct oidset loose_oid_set = OIDSET_INIT;
674 int use_oidset = 0;
675 struct loose_object_iter iter = {&loose_oid_set, *refs};
676
677 /* Enumerate all loose objects or know refs are not so many. */
678 use_oidset = !for_each_loose_object(add_loose_objects_to_set,
679 &iter, 0);
745f7a8c
NTND
680
681 save_commit_buffer = 0;
682
683 for (ref = *refs; ref; ref = ref->next) {
684 struct object *o;
024aa469 685 unsigned int flags = OBJECT_INFO_QUICK;
745f7a8c 686
024aa469
TI
687 if (use_oidset &&
688 !oidset_contains(&loose_oid_set, &ref->old_oid)) {
689 /*
690 * I know this does not exist in the loose form,
691 * so check if it exists in a non-loose form.
692 */
693 flags |= OBJECT_INFO_IGNORE_LOOSE;
694 }
012a1bb5 695
024aa469
TI
696 if (!has_object_file_with_flags(&ref->old_oid, flags))
697 continue;
109cd76d 698 o = parse_object(the_repository, &ref->old_oid);
745f7a8c
NTND
699 if (!o)
700 continue;
701
702 /* We already have it -- which may mean that we were
703 * in sync with the other side at some time after
704 * that (it is OK if we guess wrong here).
705 */
706 if (o->type == OBJ_COMMIT) {
707 struct commit *commit = (struct commit *)o;
708 if (!cutoff || cutoff < commit->date)
709 cutoff = commit->date;
710 }
711 }
712
024aa469
TI
713 oidset_clear(&loose_oid_set);
714
12f19a98
JT
715 if (!args->deepen) {
716 for_each_ref(mark_complete_oid, NULL);
717 for_each_cached_alternate(NULL, mark_alternate_complete);
718 commit_list_sort_by_date(&complete);
719 if (cutoff)
720 mark_recent_complete_commits(args, cutoff);
721 }
745f7a8c 722
12f19a98
JT
723 /*
724 * Mark all complete remote refs as common refs.
725 * Don't mark them common yet; the server has to be told so first.
726 */
727 for (ref = *refs; ref; ref = ref->next) {
728 struct object *o = deref_tag(the_repository,
729 lookup_object(the_repository,
730 ref->old_oid.hash),
731 NULL, 0);
745f7a8c 732
12f19a98
JT
733 if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE))
734 continue;
745f7a8c 735
12f19a98
JT
736 negotiator->known_common(negotiator,
737 (struct commit *)o);
745f7a8c
NTND
738 }
739
34c29034
JT
740 save_commit_buffer = old_save_commit_buffer;
741}
742
743/*
744 * Returns 1 if every object pointed to by the given remote refs is available
745 * locally and reachable from a local ref, and 0 otherwise.
746 */
747static int everything_local(struct fetch_pack_args *args,
748 struct ref **refs)
749{
750 struct ref *ref;
751 int retval;
745f7a8c
NTND
752
753 for (retval = 1, ref = *refs; ref ; ref = ref->next) {
1b283377 754 const struct object_id *remote = &ref->old_oid;
745f7a8c
NTND
755 struct object *o;
756
5abddd1e 757 o = lookup_object(the_repository, remote->hash);
745f7a8c
NTND
758 if (!o || !(o->flags & COMPLETE)) {
759 retval = 0;
1b283377 760 print_verbose(args, "want %s (%s)", oid_to_hex(remote),
0d789a5b 761 ref->name);
745f7a8c
NTND
762 continue;
763 }
1b283377 764 print_verbose(args, _("already have %s (%s)"), oid_to_hex(remote),
0d789a5b 765 ref->name);
745f7a8c 766 }
a1c6d7c1 767
745f7a8c
NTND
768 return retval;
769}
770
771static int sideband_demux(int in, int out, void *data)
772{
773 int *xd = data;
9ff18faf 774 int ret;
745f7a8c 775
9ff18faf 776 ret = recv_sideband("fetch-pack", xd[0], out);
745f7a8c
NTND
777 close(out);
778 return ret;
779}
780
781static int get_pack(struct fetch_pack_args *args,
782 int xd[2], char **pack_lockfile)
783{
784 struct async demux;
745f7a8c 785 int do_keep = args->keep_pack;
984a43b9
JK
786 const char *cmd_name;
787 struct pack_header header;
788 int pass_header = 0;
d3180279 789 struct child_process cmd = CHILD_PROCESS_INIT;
c6807a40 790 int ret;
745f7a8c
NTND
791
792 memset(&demux, 0, sizeof(demux));
793 if (use_sideband) {
794 /* xd[] is talking with upload-pack; subprocess reads from
795 * xd[0], spits out band#2 to stderr, and feeds us band#1
796 * through demux->out.
797 */
798 demux.proc = sideband_demux;
799 demux.data = xd;
800 demux.out = -1;
df857572 801 demux.isolate_sigpipe = 1;
745f7a8c 802 if (start_async(&demux))
1dd73e20 803 die(_("fetch-pack: unable to fork off sideband demultiplexer"));
745f7a8c
NTND
804 }
805 else
806 demux.out = xd[0];
807
745f7a8c 808 if (!args->keep_pack && unpack_limit) {
745f7a8c
NTND
809
810 if (read_pack_header(demux.out, &header))
1dd73e20 811 die(_("protocol error: bad pack header"));
984a43b9 812 pass_header = 1;
745f7a8c
NTND
813 if (ntohl(header.hdr_entries) < unpack_limit)
814 do_keep = 0;
815 else
816 do_keep = 1;
817 }
818
6035d6aa 819 if (alternate_shallow_file) {
984a43b9
JK
820 argv_array_push(&cmd.args, "--shallow-file");
821 argv_array_push(&cmd.args, alternate_shallow_file);
6035d6aa
NTND
822 }
823
88e2f9ed 824 if (do_keep || args->from_promisor) {
745f7a8c
NTND
825 if (pack_lockfile)
826 cmd.out = -1;
984a43b9
JK
827 cmd_name = "index-pack";
828 argv_array_push(&cmd.args, cmd_name);
829 argv_array_push(&cmd.args, "--stdin");
745f7a8c 830 if (!args->quiet && !args->no_progress)
984a43b9 831 argv_array_push(&cmd.args, "-v");
745f7a8c 832 if (args->use_thin_pack)
984a43b9 833 argv_array_push(&cmd.args, "--fix-thin");
88e2f9ed 834 if (do_keep && (args->lock_pack || unpack_limit)) {
da25bdb7 835 char hostname[HOST_NAME_MAX + 1];
5781a9a2 836 if (xgethostname(hostname, sizeof(hostname)))
984a43b9
JK
837 xsnprintf(hostname, sizeof(hostname), "localhost");
838 argv_array_pushf(&cmd.args,
839 "--keep=fetch-pack %"PRIuMAX " on %s",
840 (uintmax_t)getpid(), hostname);
745f7a8c 841 }
c6807a40 842 if (args->check_self_contained_and_connected)
984a43b9 843 argv_array_push(&cmd.args, "--check-self-contained-and-connected");
88e2f9ed
JT
844 if (args->from_promisor)
845 argv_array_push(&cmd.args, "--promisor");
745f7a8c
NTND
846 }
847 else {
984a43b9
JK
848 cmd_name = "unpack-objects";
849 argv_array_push(&cmd.args, cmd_name);
745f7a8c 850 if (args->quiet || args->no_progress)
984a43b9 851 argv_array_push(&cmd.args, "-q");
c6807a40 852 args->check_self_contained_and_connected = 0;
745f7a8c 853 }
984a43b9
JK
854
855 if (pass_header)
856 argv_array_pushf(&cmd.args, "--pack_header=%"PRIu32",%"PRIu32,
857 ntohl(header.hdr_version),
858 ntohl(header.hdr_entries));
745f7a8c
NTND
859 if (fetch_fsck_objects >= 0
860 ? fetch_fsck_objects
861 : transfer_fsck_objects >= 0
862 ? transfer_fsck_objects
98a2ea46
JT
863 : 0) {
864 if (args->from_promisor)
865 /*
866 * We cannot use --strict in index-pack because it
867 * checks both broken objects and links, but we only
868 * want to check for broken objects.
869 */
870 argv_array_push(&cmd.args, "--fsck-objects");
871 else
1362df0d
ÆAB
872 argv_array_pushf(&cmd.args, "--strict%s",
873 fsck_msg_types.buf);
98a2ea46 874 }
745f7a8c
NTND
875
876 cmd.in = demux.out;
877 cmd.git_cmd = 1;
878 if (start_command(&cmd))
1dd73e20 879 die(_("fetch-pack: unable to fork off %s"), cmd_name);
745f7a8c
NTND
880 if (do_keep && pack_lockfile) {
881 *pack_lockfile = index_pack_lockfile(cmd.out);
882 close(cmd.out);
883 }
884
37cb1dd6
JL
885 if (!use_sideband)
886 /* Closed by start_command() */
887 xd[0] = -1;
888
c6807a40
NTND
889 ret = finish_command(&cmd);
890 if (!ret || (args->check_self_contained_and_connected && ret == 1))
891 args->self_contained_and_connected =
892 args->check_self_contained_and_connected &&
893 ret == 0;
894 else
1dd73e20 895 die(_("%s failed"), cmd_name);
745f7a8c 896 if (use_sideband && finish_async(&demux))
1dd73e20 897 die(_("error in sideband demultiplexer"));
745f7a8c
NTND
898 return 0;
899}
900
f2db854d
JH
901static int cmp_ref_by_name(const void *a_, const void *b_)
902{
903 const struct ref *a = *((const struct ref **)a_);
904 const struct ref *b = *((const struct ref **)b_);
905 return strcmp(a->name, b->name);
906}
907
745f7a8c
NTND
908static struct ref *do_fetch_pack(struct fetch_pack_args *args,
909 int fd[2],
910 const struct ref *orig_ref,
f2db854d 911 struct ref **sought, int nr_sought,
beea4152 912 struct shallow_info *si,
745f7a8c
NTND
913 char **pack_lockfile)
914{
915 struct ref *ref = copy_ref_list(orig_ref);
1b283377 916 struct object_id oid;
745f7a8c
NTND
917 const char *agent_feature;
918 int agent_len;
ec062838 919 struct fetch_negotiator negotiator;
42cc7485 920 fetch_negotiator_init(&negotiator, negotiation_algorithm);
745f7a8c
NTND
921
922 sort_ref_list(&ref, ref_compare_name);
9ed0d8d6 923 QSORT(sought, nr_sought, cmp_ref_by_name);
745f7a8c 924
c8813487 925 if ((args->depth > 0 || is_repository_shallow(the_repository)) && !server_supports("shallow"))
1dd73e20 926 die(_("Server does not support shallow clients"));
a45a2600 927 if (args->depth > 0 || args->deepen_since || args->deepen_not)
79891cb9 928 args->deepen = 1;
745f7a8c 929 if (server_supports("multi_ack_detailed")) {
1dd73e20 930 print_verbose(args, _("Server supports multi_ack_detailed"));
745f7a8c
NTND
931 multi_ack = 2;
932 if (server_supports("no-done")) {
1dd73e20 933 print_verbose(args, _("Server supports no-done"));
745f7a8c
NTND
934 if (args->stateless_rpc)
935 no_done = 1;
936 }
937 }
938 else if (server_supports("multi_ack")) {
1dd73e20 939 print_verbose(args, _("Server supports multi_ack"));
745f7a8c
NTND
940 multi_ack = 1;
941 }
942 if (server_supports("side-band-64k")) {
1dd73e20 943 print_verbose(args, _("Server supports side-band-64k"));
745f7a8c
NTND
944 use_sideband = 2;
945 }
946 else if (server_supports("side-band")) {
1dd73e20 947 print_verbose(args, _("Server supports side-band"));
745f7a8c
NTND
948 use_sideband = 1;
949 }
6e7b66ee 950 if (server_supports("allow-tip-sha1-in-want")) {
1dd73e20 951 print_verbose(args, _("Server supports allow-tip-sha1-in-want"));
7199c093 952 allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
6e7b66ee 953 }
68ee6289 954 if (server_supports("allow-reachable-sha1-in-want")) {
1dd73e20 955 print_verbose(args, _("Server supports allow-reachable-sha1-in-want"));
68ee6289
FM
956 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
957 }
745f7a8c
NTND
958 if (!server_supports("thin-pack"))
959 args->use_thin_pack = 0;
960 if (!server_supports("no-progress"))
961 args->no_progress = 0;
962 if (!server_supports("include-tag"))
963 args->include_tag = 0;
0d789a5b 964 if (server_supports("ofs-delta"))
1dd73e20 965 print_verbose(args, _("Server supports ofs-delta"));
0d789a5b 966 else
745f7a8c
NTND
967 prefer_ofs_delta = 0;
968
640d8b72
JH
969 if (server_supports("filter")) {
970 server_supports_filtering = 1;
971 print_verbose(args, _("Server supports filter"));
972 } else if (args->filter_options.choice) {
973 warning("filtering not recognized by server, ignoring");
974 }
975
745f7a8c
NTND
976 if ((agent_feature = server_feature_value("agent", &agent_len))) {
977 agent_supported = 1;
0d789a5b 978 if (agent_len)
1dd73e20 979 print_verbose(args, _("Server version is %.*s"),
0d789a5b 980 agent_len, agent_feature);
745f7a8c 981 }
508ea882
NTND
982 if (server_supports("deepen-since"))
983 deepen_since_ok = 1;
984 else if (args->deepen_since)
985 die(_("Server does not support --shallow-since"));
a45a2600
NTND
986 if (server_supports("deepen-not"))
987 deepen_not_ok = 1;
988 else if (args->deepen_not)
989 die(_("Server does not support --shallow-exclude"));
cccf74e2
NTND
990 if (!server_supports("deepen-relative") && args->deepen_relative)
991 die(_("Server does not support --deepen"));
745f7a8c 992
12f19a98
JT
993 if (!args->no_dependents) {
994 mark_complete_and_common_ref(&negotiator, args, &ref);
995 filter_refs(args, &ref, sought, nr_sought);
996 if (everything_local(args, &ref)) {
997 packet_flush(fd[1]);
998 goto all_done;
999 }
1000 } else {
1001 filter_refs(args, &ref, sought, nr_sought);
745f7a8c 1002 }
ec062838 1003 if (find_common(&negotiator, args, fd, &oid, ref) < 0)
745f7a8c
NTND
1004 if (!args->keep_pack)
1005 /* When cloning, it is not unusual to have
1006 * no common commit.
1007 */
1dd73e20 1008 warning(_("no common commits"));
745f7a8c
NTND
1009
1010 if (args->stateless_rpc)
1011 packet_flush(fd[1]);
79891cb9 1012 if (args->deepen)
1a30f5a2
NTND
1013 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
1014 NULL);
4820a33b 1015 else if (si->nr_ours || si->nr_theirs)
beea4152 1016 alternate_shallow_file = setup_temporary_shallow(si->shallow);
6da8bdcb
NTND
1017 else
1018 alternate_shallow_file = NULL;
745f7a8c 1019 if (get_pack(args, fd, pack_lockfile))
1dd73e20 1020 die(_("git fetch-pack: fetch failed."));
745f7a8c
NTND
1021
1022 all_done:
ec062838 1023 negotiator.release(&negotiator);
745f7a8c
NTND
1024 return ref;
1025}
1026
f7e20501
BW
1027static void add_shallow_requests(struct strbuf *req_buf,
1028 const struct fetch_pack_args *args)
1029{
00624d60 1030 if (is_repository_shallow(the_repository))
f7e20501
BW
1031 write_shallow_commits(req_buf, 1, NULL);
1032 if (args->depth > 0)
1033 packet_buf_write(req_buf, "deepen %d", args->depth);
1034 if (args->deepen_since) {
1035 timestamp_t max_age = approxidate(args->deepen_since);
1036 packet_buf_write(req_buf, "deepen-since %"PRItime, max_age);
1037 }
1038 if (args->deepen_not) {
1039 int i;
1040 for (i = 0; i < args->deepen_not->nr; i++) {
1041 struct string_list_item *s = args->deepen_not->items + i;
1042 packet_buf_write(req_buf, "deepen-not %s", s->string);
1043 }
1044 }
1045}
1046
12f19a98 1047static void add_wants(int no_dependents, const struct ref *wants, struct strbuf *req_buf)
685fbd32 1048{
73302051
BW
1049 int use_ref_in_want = server_supports_feature("fetch", "ref-in-want", 0);
1050
685fbd32
BW
1051 for ( ; wants ; wants = wants->next) {
1052 const struct object_id *remote = &wants->old_oid;
685fbd32
BW
1053 struct object *o;
1054
1055 /*
1056 * If that object is complete (i.e. it is an ancestor of a
1057 * local ref), we tell them we have it but do not have to
1058 * tell them about its ancestors, which they already know
1059 * about.
1060 *
1061 * We use lookup_object here because we are only
1062 * interested in the case we *know* the object is
1063 * reachable and we have already scanned it.
12f19a98
JT
1064 *
1065 * Do this only if args->no_dependents is false (if it is true,
1066 * we cannot trust the object flags).
685fbd32 1067 */
12f19a98
JT
1068 if (!no_dependents &&
1069 ((o = lookup_object(the_repository, remote->hash)) != NULL) &&
685fbd32
BW
1070 (o->flags & COMPLETE)) {
1071 continue;
1072 }
1073
73302051
BW
1074 if (!use_ref_in_want || wants->exact_oid)
1075 packet_buf_write(req_buf, "want %s\n", oid_to_hex(remote));
1076 else
1077 packet_buf_write(req_buf, "want-ref %s\n", wants->name);
685fbd32
BW
1078 }
1079}
1080
1081static void add_common(struct strbuf *req_buf, struct oidset *common)
1082{
1083 struct oidset_iter iter;
1084 const struct object_id *oid;
1085 oidset_iter_init(common, &iter);
1086
1087 while ((oid = oidset_iter_next(&iter))) {
1088 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1089 }
1090}
1091
ec062838
JT
1092static int add_haves(struct fetch_negotiator *negotiator,
1093 struct strbuf *req_buf,
d30fe89c 1094 int *haves_to_send, int *in_vain)
685fbd32
BW
1095{
1096 int ret = 0;
1097 int haves_added = 0;
1098 const struct object_id *oid;
1099
ec062838 1100 while ((oid = negotiator->next(negotiator))) {
685fbd32
BW
1101 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1102 if (++haves_added >= *haves_to_send)
1103 break;
1104 }
1105
1106 *in_vain += haves_added;
1107 if (!haves_added || *in_vain >= MAX_IN_VAIN) {
1108 /* Send Done */
1109 packet_buf_write(req_buf, "done\n");
1110 ret = 1;
1111 }
1112
1113 /* Increase haves to send on next round */
1114 *haves_to_send = next_flush(1, *haves_to_send);
1115
1116 return ret;
1117}
1118
ec062838 1119static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out,
d30fe89c 1120 const struct fetch_pack_args *args,
685fbd32
BW
1121 const struct ref *wants, struct oidset *common,
1122 int *haves_to_send, int *in_vain)
1123{
1124 int ret = 0;
1125 struct strbuf req_buf = STRBUF_INIT;
1126
1127 if (server_supports_v2("fetch", 1))
1128 packet_buf_write(&req_buf, "command=fetch");
1129 if (server_supports_v2("agent", 0))
1130 packet_buf_write(&req_buf, "agent=%s", git_user_agent_sanitized());
5e3548ef
BW
1131 if (args->server_options && args->server_options->nr &&
1132 server_supports_v2("server-option", 1)) {
1133 int i;
1134 for (i = 0; i < args->server_options->nr; i++)
1135 packet_write_fmt(fd_out, "server-option=%s",
1136 args->server_options->items[i].string);
1137 }
685fbd32
BW
1138
1139 packet_buf_delim(&req_buf);
1140 if (args->use_thin_pack)
1141 packet_buf_write(&req_buf, "thin-pack");
1142 if (args->no_progress)
1143 packet_buf_write(&req_buf, "no-progress");
1144 if (args->include_tag)
1145 packet_buf_write(&req_buf, "include-tag");
1146 if (prefer_ofs_delta)
1147 packet_buf_write(&req_buf, "ofs-delta");
1148
f7e20501
BW
1149 /* Add shallow-info and deepen request */
1150 if (server_supports_feature("fetch", "shallow", 0))
1151 add_shallow_requests(&req_buf, args);
00624d60 1152 else if (is_repository_shallow(the_repository) || args->deepen)
f7e20501
BW
1153 die(_("Server does not support shallow requests"));
1154
ba95710a
JT
1155 /* Add filter */
1156 if (server_supports_feature("fetch", "filter", 0) &&
1157 args->filter_options.choice) {
1158 print_verbose(args, _("Server supports filter"));
1159 packet_buf_write(&req_buf, "filter %s",
1160 args->filter_options.filter_spec);
1161 } else if (args->filter_options.choice) {
1162 warning("filtering not recognized by server, ignoring");
1163 }
1164
685fbd32 1165 /* add wants */
12f19a98 1166 add_wants(args->no_dependents, wants, &req_buf);
685fbd32 1167
ba95710a
JT
1168 if (args->no_dependents) {
1169 packet_buf_write(&req_buf, "done");
1170 ret = 1;
1171 } else {
1172 /* Add all of the common commits we've found in previous rounds */
1173 add_common(&req_buf, common);
685fbd32 1174
ba95710a 1175 /* Add initial haves */
ec062838 1176 ret = add_haves(negotiator, &req_buf, haves_to_send, in_vain);
ba95710a 1177 }
685fbd32
BW
1178
1179 /* Send request */
1180 packet_buf_flush(&req_buf);
1181 write_or_die(fd_out, req_buf.buf, req_buf.len);
1182
1183 strbuf_release(&req_buf);
1184 return ret;
1185}
1186
1187/*
1188 * Processes a section header in a server's response and checks if it matches
1189 * `section`. If the value of `peek` is 1, the header line will be peeked (and
1190 * not consumed); if 0, the line will be consumed and the function will die if
1191 * the section header doesn't match what was expected.
1192 */
1193static int process_section_header(struct packet_reader *reader,
1194 const char *section, int peek)
1195{
1196 int ret;
1197
1198 if (packet_reader_peek(reader) != PACKET_READ_NORMAL)
bbb19a8b 1199 die(_("error reading section header '%s'"), section);
685fbd32
BW
1200
1201 ret = !strcmp(reader->line, section);
1202
1203 if (!peek) {
1204 if (!ret)
bbb19a8b 1205 die(_("expected '%s', received '%s'"),
685fbd32
BW
1206 section, reader->line);
1207 packet_reader_read(reader);
1208 }
1209
1210 return ret;
1211}
1212
ec062838 1213static int process_acks(struct fetch_negotiator *negotiator,
d30fe89c
JT
1214 struct packet_reader *reader,
1215 struct oidset *common)
685fbd32
BW
1216{
1217 /* received */
1218 int received_ready = 0;
1219 int received_ack = 0;
1220
1221 process_section_header(reader, "acknowledgments", 0);
1222 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1223 const char *arg;
1224
1225 if (!strcmp(reader->line, "NAK"))
1226 continue;
1227
1228 if (skip_prefix(reader->line, "ACK ", &arg)) {
1229 struct object_id oid;
1230 if (!get_oid_hex(arg, &oid)) {
1231 struct commit *commit;
1232 oidset_insert(common, &oid);
c1f5eb49 1233 commit = lookup_commit(the_repository, &oid);
ec062838 1234 negotiator->ack(negotiator, commit);
685fbd32
BW
1235 }
1236 continue;
1237 }
1238
1239 if (!strcmp(reader->line, "ready")) {
685fbd32
BW
1240 received_ready = 1;
1241 continue;
1242 }
1243
bbb19a8b 1244 die(_("unexpected acknowledgment line: '%s'"), reader->line);
685fbd32
BW
1245 }
1246
1247 if (reader->status != PACKET_READ_FLUSH &&
1248 reader->status != PACKET_READ_DELIM)
bbb19a8b 1249 die(_("error processing acks: %d"), reader->status);
685fbd32 1250
5400b2a2
JT
1251 /*
1252 * If an "acknowledgments" section is sent, a packfile is sent if and
1253 * only if "ready" was sent in this section. The other sections
1254 * ("shallow-info" and "wanted-refs") are sent only if a packfile is
1255 * sent. Therefore, a DELIM is expected if "ready" is sent, and a FLUSH
1256 * otherwise.
1257 */
1258 if (received_ready && reader->status != PACKET_READ_DELIM)
1259 die(_("expected packfile to be sent after 'ready'"));
1260 if (!received_ready && reader->status != PACKET_READ_FLUSH)
1261 die(_("expected no other sections to be sent after no 'ready'"));
1262
685fbd32
BW
1263 /* return 0 if no common, 1 if there are common, or 2 if ready */
1264 return received_ready ? 2 : (received_ack ? 1 : 0);
1265}
1266
f7e20501
BW
1267static void receive_shallow_info(struct fetch_pack_args *args,
1268 struct packet_reader *reader)
1269{
1270 process_section_header(reader, "shallow-info", 0);
1271 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1272 const char *arg;
1273 struct object_id oid;
1274
1275 if (skip_prefix(reader->line, "shallow ", &arg)) {
1276 if (get_oid_hex(arg, &oid))
1277 die(_("invalid shallow line: %s"), reader->line);
00624d60 1278 register_shallow(the_repository, &oid);
f7e20501
BW
1279 continue;
1280 }
1281 if (skip_prefix(reader->line, "unshallow ", &arg)) {
1282 if (get_oid_hex(arg, &oid))
1283 die(_("invalid unshallow line: %s"), reader->line);
5abddd1e 1284 if (!lookup_object(the_repository, oid.hash))
f7e20501
BW
1285 die(_("object not found: %s"), reader->line);
1286 /* make sure that it is parsed as shallow */
109cd76d 1287 if (!parse_object(the_repository, &oid))
f7e20501
BW
1288 die(_("error in object: %s"), reader->line);
1289 if (unregister_shallow(&oid))
1290 die(_("no shallow found: %s"), reader->line);
1291 continue;
1292 }
1293 die(_("expected shallow/unshallow, got %s"), reader->line);
1294 }
1295
1296 if (reader->status != PACKET_READ_FLUSH &&
1297 reader->status != PACKET_READ_DELIM)
bbb19a8b 1298 die(_("error processing shallow info: %d"), reader->status);
f7e20501
BW
1299
1300 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file, NULL);
1301 args->deepen = 1;
1302}
1303
e2842b39
JT
1304static void receive_wanted_refs(struct packet_reader *reader,
1305 struct ref **sought, int nr_sought)
73302051
BW
1306{
1307 process_section_header(reader, "wanted-refs", 0);
1308 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1309 struct object_id oid;
1310 const char *end;
e2842b39 1311 int i;
73302051
BW
1312
1313 if (parse_oid_hex(reader->line, &oid, &end) || *end++ != ' ')
bbb19a8b 1314 die(_("expected wanted-ref, got '%s'"), reader->line);
73302051 1315
e2842b39
JT
1316 for (i = 0; i < nr_sought; i++) {
1317 if (!strcmp(end, sought[i]->name)) {
1318 oidcpy(&sought[i]->old_oid, &oid);
73302051
BW
1319 break;
1320 }
1321 }
1322
e2842b39 1323 if (i == nr_sought)
bbb19a8b 1324 die(_("unexpected wanted-ref: '%s'"), reader->line);
73302051
BW
1325 }
1326
1327 if (reader->status != PACKET_READ_DELIM)
bbb19a8b 1328 die(_("error processing wanted refs: %d"), reader->status);
73302051
BW
1329}
1330
685fbd32
BW
1331enum fetch_state {
1332 FETCH_CHECK_LOCAL = 0,
1333 FETCH_SEND_REQUEST,
1334 FETCH_PROCESS_ACKS,
1335 FETCH_GET_PACK,
1336 FETCH_DONE,
1337};
1338
1339static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
1340 int fd[2],
1341 const struct ref *orig_ref,
1342 struct ref **sought, int nr_sought,
1343 char **pack_lockfile)
1344{
1345 struct ref *ref = copy_ref_list(orig_ref);
1346 enum fetch_state state = FETCH_CHECK_LOCAL;
1347 struct oidset common = OIDSET_INIT;
1348 struct packet_reader reader;
1349 int in_vain = 0;
1350 int haves_to_send = INITIAL_FLUSH;
ec062838 1351 struct fetch_negotiator negotiator;
42cc7485 1352 fetch_negotiator_init(&negotiator, negotiation_algorithm);
685fbd32
BW
1353 packet_reader_init(&reader, fd[0], NULL, 0,
1354 PACKET_READ_CHOMP_NEWLINE);
1355
1356 while (state != FETCH_DONE) {
1357 switch (state) {
1358 case FETCH_CHECK_LOCAL:
1359 sort_ref_list(&ref, ref_compare_name);
1360 QSORT(sought, nr_sought, cmp_ref_by_name);
1361
1362 /* v2 supports these by default */
1363 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1364 use_sideband = 2;
f7e20501
BW
1365 if (args->depth > 0 || args->deepen_since || args->deepen_not)
1366 args->deepen = 1;
685fbd32 1367
685fbd32 1368 /* Filter 'ref' by 'sought' and those that aren't local */
12f19a98
JT
1369 if (!args->no_dependents) {
1370 mark_complete_and_common_ref(&negotiator, args, &ref);
1371 filter_refs(args, &ref, sought, nr_sought);
1372 if (everything_local(args, &ref))
1373 state = FETCH_DONE;
1374 else
1375 state = FETCH_SEND_REQUEST;
1376
1377 mark_tips(&negotiator, args->negotiation_tips);
1378 for_each_cached_alternate(&negotiator,
1379 insert_one_alternate_object);
1380 } else {
1381 filter_refs(args, &ref, sought, nr_sought);
685fbd32 1382 state = FETCH_SEND_REQUEST;
12f19a98 1383 }
685fbd32
BW
1384 break;
1385 case FETCH_SEND_REQUEST:
ec062838
JT
1386 if (send_fetch_request(&negotiator, fd[1], args, ref,
1387 &common,
685fbd32
BW
1388 &haves_to_send, &in_vain))
1389 state = FETCH_GET_PACK;
1390 else
1391 state = FETCH_PROCESS_ACKS;
1392 break;
1393 case FETCH_PROCESS_ACKS:
1394 /* Process ACKs/NAKs */
ec062838 1395 switch (process_acks(&negotiator, &reader, &common)) {
685fbd32
BW
1396 case 2:
1397 state = FETCH_GET_PACK;
1398 break;
1399 case 1:
1400 in_vain = 0;
1401 /* fallthrough */
1402 default:
1403 state = FETCH_SEND_REQUEST;
1404 break;
1405 }
1406 break;
1407 case FETCH_GET_PACK:
f7e20501
BW
1408 /* Check for shallow-info section */
1409 if (process_section_header(&reader, "shallow-info", 1))
1410 receive_shallow_info(args, &reader);
1411
73302051 1412 if (process_section_header(&reader, "wanted-refs", 1))
e2842b39 1413 receive_wanted_refs(&reader, sought, nr_sought);
73302051 1414
685fbd32
BW
1415 /* get the pack */
1416 process_section_header(&reader, "packfile", 0);
1417 if (get_pack(args, fd, pack_lockfile))
1418 die(_("git fetch-pack: fetch failed."));
1419
1420 state = FETCH_DONE;
1421 break;
1422 case FETCH_DONE:
1423 continue;
1424 }
1425 }
1426
ec062838 1427 negotiator.release(&negotiator);
685fbd32
BW
1428 oidset_clear(&common);
1429 return ref;
1430}
1431
1362df0d
ÆAB
1432static int fetch_pack_config_cb(const char *var, const char *value, void *cb)
1433{
1434 if (strcmp(var, "fetch.fsck.skiplist") == 0) {
1435 const char *path;
1436
1437 if (git_config_pathname(&path, var, value))
1438 return 1;
1439 strbuf_addf(&fsck_msg_types, "%cskiplist=%s",
1440 fsck_msg_types.len ? ',' : '=', path);
1441 free((char *)path);
1442 return 0;
1443 }
1444
1445 if (skip_prefix(var, "fetch.fsck.", &var)) {
1446 if (is_valid_msg_type(var, value))
1447 strbuf_addf(&fsck_msg_types, "%c%s=%s",
1448 fsck_msg_types.len ? ',' : '=', var, value);
1449 else
1450 warning("Skipping unknown msg id '%s'", var);
1451 return 0;
1452 }
1453
1454 return git_default_config(var, value, cb);
1455}
1456
f44af51d 1457static void fetch_pack_config(void)
745f7a8c 1458{
f44af51d
TA
1459 git_config_get_int("fetch.unpacklimit", &fetch_unpack_limit);
1460 git_config_get_int("transfer.unpacklimit", &transfer_unpack_limit);
1461 git_config_get_bool("repack.usedeltabaseoffset", &prefer_ofs_delta);
1462 git_config_get_bool("fetch.fsckobjects", &fetch_fsck_objects);
1463 git_config_get_bool("transfer.fsckobjects", &transfer_fsck_objects);
42cc7485
JT
1464 git_config_get_string("fetch.negotiationalgorithm",
1465 &negotiation_algorithm);
745f7a8c 1466
1362df0d 1467 git_config(fetch_pack_config_cb, NULL);
745f7a8c
NTND
1468}
1469
745f7a8c
NTND
1470static void fetch_pack_setup(void)
1471{
1472 static int did_setup;
1473 if (did_setup)
1474 return;
f44af51d 1475 fetch_pack_config();
745f7a8c
NTND
1476 if (0 <= transfer_unpack_limit)
1477 unpack_limit = transfer_unpack_limit;
1478 else if (0 <= fetch_unpack_limit)
1479 unpack_limit = fetch_unpack_limit;
1480 did_setup = 1;
1481}
1482
f2db854d
JH
1483static int remove_duplicates_in_refs(struct ref **ref, int nr)
1484{
1485 struct string_list names = STRING_LIST_INIT_NODUP;
1486 int src, dst;
1487
1488 for (src = dst = 0; src < nr; src++) {
1489 struct string_list_item *item;
1490 item = string_list_insert(&names, ref[src]->name);
1491 if (item->util)
1492 continue; /* already have it */
1493 item->util = ref[src];
1494 if (src != dst)
1495 ref[dst] = ref[src];
1496 dst++;
1497 }
1498 for (src = dst; src < nr; src++)
1499 ref[src] = NULL;
1500 string_list_clear(&names, 0);
1501 return dst;
1502}
1503
beea4152 1504static void update_shallow(struct fetch_pack_args *args,
e2842b39 1505 struct ref **sought, int nr_sought,
beea4152 1506 struct shallow_info *si)
a796ccee 1507{
910650d2 1508 struct oid_array ref = OID_ARRAY_INIT;
4820a33b 1509 int *status;
beea4152
NTND
1510 int i;
1511
79891cb9 1512 if (args->deepen && alternate_shallow_file) {
a796ccee 1513 if (*alternate_shallow_file == '\0') { /* --unshallow */
102de880 1514 unlink_or_warn(git_path_shallow(the_repository));
a796ccee
NTND
1515 rollback_lock_file(&shallow_lock);
1516 } else
1517 commit_lock_file(&shallow_lock);
1518 return;
1519 }
beea4152
NTND
1520
1521 if (!si->shallow || !si->shallow->nr)
1522 return;
1523
beea4152
NTND
1524 if (args->cloning) {
1525 /*
1526 * remote is shallow, but this is a clone, there are
1527 * no objects in repo to worry about. Accept any
1528 * shallow points that exist in the pack (iow in repo
1529 * after get_pack() and reprepare_packed_git())
1530 */
910650d2 1531 struct oid_array extra = OID_ARRAY_INIT;
ee3051bd 1532 struct object_id *oid = si->shallow->oid;
beea4152 1533 for (i = 0; i < si->shallow->nr; i++)
ee3051bd 1534 if (has_object_file(&oid[i]))
910650d2 1535 oid_array_append(&extra, &oid[i]);
beea4152
NTND
1536 if (extra.nr) {
1537 setup_alternate_shallow(&shallow_lock,
1538 &alternate_shallow_file,
1539 &extra);
1540 commit_lock_file(&shallow_lock);
1541 }
910650d2 1542 oid_array_clear(&extra);
beea4152
NTND
1543 return;
1544 }
4820a33b
NTND
1545
1546 if (!si->nr_ours && !si->nr_theirs)
1547 return;
1548
1549 remove_nonexistent_theirs_shallow(si);
4820a33b
NTND
1550 if (!si->nr_ours && !si->nr_theirs)
1551 return;
e2842b39
JT
1552 for (i = 0; i < nr_sought; i++)
1553 oid_array_append(&ref, &sought[i]->old_oid);
4820a33b
NTND
1554 si->ref = &ref;
1555
48d25cae
NTND
1556 if (args->update_shallow) {
1557 /*
1558 * remote is also shallow, .git/shallow may be updated
1559 * so all refs can be accepted. Make sure we only add
1560 * shallow roots that are actually reachable from new
1561 * refs.
1562 */
910650d2 1563 struct oid_array extra = OID_ARRAY_INIT;
ee3051bd 1564 struct object_id *oid = si->shallow->oid;
48d25cae
NTND
1565 assign_shallow_commits_to_refs(si, NULL, NULL);
1566 if (!si->nr_ours && !si->nr_theirs) {
910650d2 1567 oid_array_clear(&ref);
48d25cae
NTND
1568 return;
1569 }
1570 for (i = 0; i < si->nr_ours; i++)
910650d2 1571 oid_array_append(&extra, &oid[si->ours[i]]);
48d25cae 1572 for (i = 0; i < si->nr_theirs; i++)
910650d2 1573 oid_array_append(&extra, &oid[si->theirs[i]]);
48d25cae
NTND
1574 setup_alternate_shallow(&shallow_lock,
1575 &alternate_shallow_file,
1576 &extra);
1577 commit_lock_file(&shallow_lock);
910650d2 1578 oid_array_clear(&extra);
1579 oid_array_clear(&ref);
48d25cae
NTND
1580 return;
1581 }
1582
4820a33b
NTND
1583 /*
1584 * remote is also shallow, check what ref is safe to update
1585 * without updating .git/shallow
1586 */
e2842b39 1587 status = xcalloc(nr_sought, sizeof(*status));
4820a33b
NTND
1588 assign_shallow_commits_to_refs(si, NULL, status);
1589 if (si->nr_ours || si->nr_theirs) {
e2842b39 1590 for (i = 0; i < nr_sought; i++)
4820a33b 1591 if (status[i])
e2842b39 1592 sought[i]->status = REF_STATUS_REJECT_SHALLOW;
4820a33b
NTND
1593 }
1594 free(status);
910650d2 1595 oid_array_clear(&ref);
a796ccee
NTND
1596}
1597
cf1e7c07
JT
1598static int iterate_ref_map(void *cb_data, struct object_id *oid)
1599{
1600 struct ref **rm = cb_data;
1601 struct ref *ref = *rm;
1602
1603 if (!ref)
1604 return -1; /* end of the list */
1605 *rm = ref->next;
1606 oidcpy(oid, &ref->old_oid);
1607 return 0;
1608}
1609
745f7a8c
NTND
1610struct ref *fetch_pack(struct fetch_pack_args *args,
1611 int fd[], struct child_process *conn,
1612 const struct ref *ref,
1613 const char *dest,
f2db854d 1614 struct ref **sought, int nr_sought,
910650d2 1615 struct oid_array *shallow,
685fbd32
BW
1616 char **pack_lockfile,
1617 enum protocol_version version)
745f7a8c 1618{
745f7a8c 1619 struct ref *ref_cpy;
beea4152 1620 struct shallow_info si;
745f7a8c
NTND
1621
1622 fetch_pack_setup();
f2db854d
JH
1623 if (nr_sought)
1624 nr_sought = remove_duplicates_in_refs(sought, nr_sought);
745f7a8c 1625
4c7f9567
JT
1626 if (args->no_dependents && !args->filter_options.choice) {
1627 /*
1628 * The protocol does not support requesting that only the
1629 * wanted objects be sent, so approximate this by setting a
1630 * "blob:none" filter if no filter is already set. This works
1631 * for all object types: note that wanted blobs will still be
1632 * sent because they are directly specified as a "want".
1633 *
1634 * NEEDSWORK: Add an option in the protocol to request that
1635 * only the wanted objects be sent, and implement it.
1636 */
1637 parse_list_objects_filter(&args->filter_options, "blob:none");
1638 }
1639
01775651 1640 if (version != protocol_v2 && !ref) {
745f7a8c 1641 packet_flush(fd[1]);
1dd73e20 1642 die(_("no matching remote head"));
745f7a8c 1643 }
beea4152 1644 prepare_shallow_info(&si, shallow);
685fbd32
BW
1645 if (version == protocol_v2)
1646 ref_cpy = do_fetch_pack_v2(args, fd, ref, sought, nr_sought,
1647 pack_lockfile);
1648 else
1649 ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought,
1650 &si, pack_lockfile);
a49d2834 1651 reprepare_packed_git(the_repository);
cf1e7c07
JT
1652
1653 if (!args->cloning && args->deepen) {
1654 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1655 struct ref *iterator = ref_cpy;
1656 opt.shallow_file = alternate_shallow_file;
1657 if (args->deepen)
1658 opt.is_deepening_fetch = 1;
1659 if (check_connected(iterate_ref_map, &iterator, &opt)) {
1660 error(_("remote did not send all necessary objects"));
1661 free_refs(ref_cpy);
1662 ref_cpy = NULL;
1663 rollback_lock_file(&shallow_lock);
1664 goto cleanup;
1665 }
1666 args->connectivity_checked = 1;
1667 }
1668
e2842b39 1669 update_shallow(args, sought, nr_sought, &si);
cf1e7c07 1670cleanup:
beea4152 1671 clear_shallow_info(&si);
745f7a8c
NTND
1672 return ref_cpy;
1673}
e860d96b
MM
1674
1675int report_unmatched_refs(struct ref **sought, int nr_sought)
1676{
1677 int i, ret = 0;
1678
1679 for (i = 0; i < nr_sought; i++) {
d56583de 1680 if (!sought[i])
e860d96b 1681 continue;
d56583de
MM
1682 switch (sought[i]->match_status) {
1683 case REF_MATCHED:
1684 continue;
1685 case REF_NOT_MATCHED:
1686 error(_("no such remote ref %s"), sought[i]->name);
1687 break;
1688 case REF_UNADVERTISED_NOT_ALLOWED:
1689 error(_("Server does not allow request for unadvertised object %s"),
1690 sought[i]->name);
1691 break;
1692 }
e860d96b
MM
1693 ret = 1;
1694 }
1695 return ret;
1696}