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The sixteenth batch
[git/gitster.git] / upload-pack.c
blob4f26f6afc77106ead4ba04bae6f529ed39af7e02
1 #define USE_THE_REPOSITORY_VARIABLE
2 #define DISABLE_SIGN_COMPARE_WARNINGS
3
4 #include "git-compat-util.h"
5 #include "config.h"
6 #include "environment.h"
7 #include "gettext.h"
8 #include "hex.h"
9 #include "refs.h"
10 #include "pkt-line.h"
11 #include "sideband.h"
12 #include "repository.h"
13 #include "odb.h"
14 #include "oid-array.h"
15 #include "object.h"
16 #include "commit.h"
17 #include "diff.h"
18 #include "revision.h"
19 #include "list-objects-filter-options.h"
20 #include "run-command.h"
21 #include "connect.h"
22 #include "sigchain.h"
23 #include "version.h"
24 #include "string-list.h"
25 #include "strvec.h"
26 #include "trace2.h"
27 #include "protocol.h"
28 #include "upload-pack.h"
29 #include "commit-graph.h"
30 #include "commit-reach.h"
31 #include "shallow.h"
32 #include "write-or-die.h"
33 #include "json-writer.h"
34 #include "strmap.h"
35 #include "promisor-remote.h"
36
37 /* Remember to update object flag allocation in object.h */
38 #define THEY_HAVE (1u << 11)
39 #define OUR_REF (1u << 12)
40 #define WANTED (1u << 13)
41 #define COMMON_KNOWN (1u << 14)
42
43 #define SHALLOW (1u << 16)
44 #define NOT_SHALLOW (1u << 17)
45 #define CLIENT_SHALLOW (1u << 18)
46 #define HIDDEN_REF (1u << 19)
47
48 #define ALL_FLAGS (THEY_HAVE | OUR_REF | WANTED | COMMON_KNOWN | SHALLOW | \
49 NOT_SHALLOW | CLIENT_SHALLOW | HIDDEN_REF)
50
51 /* Enum for allowed unadvertised object request (UOR) */
52 enum allow_uor {
53 /* Allow specifying sha1 if it is a ref tip. */
54 ALLOW_TIP_SHA1 = 0x01,
55 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
56 ALLOW_REACHABLE_SHA1 = 0x02,
57 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
58 ALLOW_ANY_SHA1 = 0x07
59 };
60
61 /*
62 * Please annotate, and if possible group together, fields used only
63 * for protocol v0 or only for protocol v2.
64 */
65 struct upload_pack_data {
66 struct string_list symref; /* v0 only */
67 struct object_array want_obj;
68 struct object_array have_obj;
69 struct strmap wanted_refs; /* v2 only */
70 struct strvec hidden_refs;
71
72 struct object_array shallows;
73 struct oidset deepen_not;
74 struct object_array extra_edge_obj;
75 int depth;
76 timestamp_t deepen_since;
77 int deepen_rev_list;
78 int deepen_relative;
79 int keepalive;
80 int shallow_nr;
81 timestamp_t oldest_have;
82
83 unsigned int timeout; /* v0 only */
84 enum {
85 NO_MULTI_ACK = 0,
86 MULTI_ACK = 1,
87 MULTI_ACK_DETAILED = 2
88 } multi_ack; /* v0 only */
89
90 /* 0 for no sideband, otherwise DEFAULT_PACKET_MAX or LARGE_PACKET_MAX */
91 int use_sideband;
92
93 struct string_list uri_protocols;
94 enum allow_uor allow_uor;
95
96 struct list_objects_filter_options filter_options;
97 struct string_list allowed_filters;
98
99 struct packet_writer writer;
100
101 char *pack_objects_hook;
102
103 unsigned stateless_rpc : 1; /* v0 only */
104 unsigned no_done : 1; /* v0 only */
105 unsigned daemon_mode : 1; /* v0 only */
106 unsigned filter_capability_requested : 1; /* v0 only */
107
108 unsigned use_thin_pack : 1;
109 unsigned use_ofs_delta : 1;
110 unsigned no_progress : 1;
111 unsigned use_include_tag : 1;
112 unsigned wait_for_done : 1;
113 unsigned allow_filter : 1;
114 unsigned allow_filter_fallback : 1;
115 unsigned long tree_filter_max_depth;
116
117 unsigned done : 1; /* v2 only */
118 unsigned allow_ref_in_want : 1; /* v2 only */
119 unsigned allow_sideband_all : 1; /* v2 only */
120 unsigned seen_haves : 1; /* v2 only */
121 unsigned allow_packfile_uris : 1; /* v2 only */
122 unsigned advertise_sid : 1;
123 unsigned sent_capabilities : 1;
124 };
125
126 static void upload_pack_data_init(struct upload_pack_data *data)
127 {
128 struct string_list symref = STRING_LIST_INIT_DUP;
129 struct strmap wanted_refs = STRMAP_INIT;
130 struct strvec hidden_refs = STRVEC_INIT;
131 struct object_array want_obj = OBJECT_ARRAY_INIT;
132 struct object_array have_obj = OBJECT_ARRAY_INIT;
133 struct object_array shallows = OBJECT_ARRAY_INIT;
134 struct oidset deepen_not = OID_ARRAY_INIT;
135 struct string_list uri_protocols = STRING_LIST_INIT_DUP;
136 struct object_array extra_edge_obj = OBJECT_ARRAY_INIT;
137 struct string_list allowed_filters = STRING_LIST_INIT_DUP;
138
139 memset(data, 0, sizeof(*data));
140 data->symref = symref;
141 data->wanted_refs = wanted_refs;
142 data->hidden_refs = hidden_refs;
143 data->want_obj = want_obj;
144 data->have_obj = have_obj;
145 data->shallows = shallows;
146 data->deepen_not = deepen_not;
147 data->uri_protocols = uri_protocols;
148 data->extra_edge_obj = extra_edge_obj;
149 data->allowed_filters = allowed_filters;
150 data->allow_filter_fallback = 1;
151 data->tree_filter_max_depth = ULONG_MAX;
152 packet_writer_init(&data->writer, 1);
153 list_objects_filter_init(&data->filter_options);
154
155 data->keepalive = 5;
156 data->advertise_sid = 0;
157 }
158
159 static void upload_pack_data_clear(struct upload_pack_data *data)
160 {
161 string_list_clear(&data->symref, 1);
162 strmap_clear(&data->wanted_refs, 1);
163 strvec_clear(&data->hidden_refs);
164 object_array_clear(&data->want_obj);
165 object_array_clear(&data->have_obj);
166 object_array_clear(&data->shallows);
167 oidset_clear(&data->deepen_not);
168 object_array_clear(&data->extra_edge_obj);
169 list_objects_filter_release(&data->filter_options);
170 string_list_clear(&data->allowed_filters, 0);
171 string_list_clear(&data->uri_protocols, 0);
172
173 free((char *)data->pack_objects_hook);
174 }
175
176 static void reset_timeout(unsigned int timeout)
177 {
178 alarm(timeout);
179 }
180
181 static void send_client_data(int fd, const char *data, ssize_t sz,
182 int use_sideband)
183 {
184 if (use_sideband) {
185 send_sideband(1, fd, data, sz, use_sideband);
186 return;
187 }
188 if (fd == 3)
189 /* emergency quit */
190 fd = 2;
191 if (fd == 2) {
192 /* XXX: are we happy to lose stuff here? */
193 xwrite(fd, data, sz);
194 return;
195 }
196 write_or_die(fd, data, sz);
197 }
198
199 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
200 {
201 FILE *fp = cb_data;
202 if (graft->nr_parent == -1)
203 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
204 return 0;
205 }
206
207 struct output_state {
208 /*
209 * We do writes no bigger than LARGE_PACKET_DATA_MAX - 1, because with
210 * sideband-64k the band designator takes up 1 byte of space. Because
211 * relay_pack_data keeps the last byte to itself, we make the buffer 1
212 * byte bigger than the intended maximum write size.
213 */
214 char buffer[(LARGE_PACKET_DATA_MAX - 1) + 1];
215 int used;
216 unsigned packfile_uris_started : 1;
217 unsigned packfile_started : 1;
218 };
219
220 static int relay_pack_data(int pack_objects_out, struct output_state *os,
221 int use_sideband, int write_packfile_line)
222 {
223 /*
224 * We keep the last byte to ourselves
225 * in case we detect broken rev-list, so that we
226 * can leave the stream corrupted. This is
227 * unfortunate -- unpack-objects would happily
228 * accept a valid packdata with trailing garbage,
229 * so appending garbage after we pass all the
230 * pack data is not good enough to signal
231 * breakage to downstream.
232 */
233 ssize_t readsz;
234
235 readsz = xread(pack_objects_out, os->buffer + os->used,
236 sizeof(os->buffer) - os->used);
237 if (readsz < 0) {
238 return readsz;
239 }
240 os->used += readsz;
241
242 while (!os->packfile_started) {
243 char *p;
244 if (os->used >= 4 && !memcmp(os->buffer, "PACK", 4)) {
245 os->packfile_started = 1;
246 if (write_packfile_line) {
247 if (os->packfile_uris_started)
248 packet_delim(1);
249 packet_write_fmt(1, "\1packfile\n");
250 }
251 break;
252 }
253 if ((p = memchr(os->buffer, '\n', os->used))) {
254 if (!os->packfile_uris_started) {
255 os->packfile_uris_started = 1;
256 if (!write_packfile_line)
257 BUG("packfile_uris requires sideband-all");
258 packet_write_fmt(1, "\1packfile-uris\n");
259 }
260 *p = '\0';
261 packet_write_fmt(1, "\1%s\n", os->buffer);
262
263 os->used -= p - os->buffer + 1;
264 memmove(os->buffer, p + 1, os->used);
265 } else {
266 /*
267 * Incomplete line.
268 */
269 return readsz;
270 }
271 }
272
273 if (os->used > 1) {
274 send_client_data(1, os->buffer, os->used - 1, use_sideband);
275 os->buffer[0] = os->buffer[os->used - 1];
276 os->used = 1;
277 } else {
278 send_client_data(1, os->buffer, os->used, use_sideband);
279 os->used = 0;
280 }
281
282 return readsz;
283 }
284
285 static void create_pack_file(struct upload_pack_data *pack_data,
286 const struct string_list *uri_protocols)
287 {
288 struct child_process pack_objects = CHILD_PROCESS_INIT;
289 struct output_state *output_state = xcalloc(1, sizeof(struct output_state));
290 char progress[128];
291 char abort_msg[] = "aborting due to possible repository "
292 "corruption on the remote side.";
293 ssize_t sz;
294 int i;
295 FILE *pipe_fd;
296
297 if (!pack_data->pack_objects_hook)
298 pack_objects.git_cmd = 1;
299 else {
300 strvec_push(&pack_objects.args, pack_data->pack_objects_hook);
301 strvec_push(&pack_objects.args, "git");
302 pack_objects.use_shell = 1;
303 }
304
305 if (pack_data->shallow_nr) {
306 strvec_push(&pack_objects.args, "--shallow-file");
307 strvec_push(&pack_objects.args, "");
308 }
309 strvec_push(&pack_objects.args, "pack-objects");
310 strvec_push(&pack_objects.args, "--revs");
311 if (pack_data->use_thin_pack)
312 strvec_push(&pack_objects.args, "--thin");
313
314 strvec_push(&pack_objects.args, "--stdout");
315 if (pack_data->shallow_nr)
316 strvec_push(&pack_objects.args, "--shallow");
317 if (!pack_data->no_progress)
318 strvec_push(&pack_objects.args, "--progress");
319 if (pack_data->use_ofs_delta)
320 strvec_push(&pack_objects.args, "--delta-base-offset");
321 if (pack_data->use_include_tag)
322 strvec_push(&pack_objects.args, "--include-tag");
323 if (repo_has_accepted_promisor_remote(the_repository))
324 strvec_push(&pack_objects.args, "--missing=allow-promisor");
325 if (pack_data->filter_options.choice) {
326 const char *spec =
327 expand_list_objects_filter_spec(&pack_data->filter_options);
328 strvec_pushf(&pack_objects.args, "--filter=%s", spec);
329 }
330 if (uri_protocols) {
331 for (i = 0; i < uri_protocols->nr; i++)
332 strvec_pushf(&pack_objects.args, "--uri-protocol=%s",
333 uri_protocols->items[i].string);
334 }
335
336 pack_objects.in = -1;
337 pack_objects.out = -1;
338 pack_objects.err = -1;
339 pack_objects.clean_on_exit = 1;
340
341 if (start_command(&pack_objects))
342 die("git upload-pack: unable to fork git-pack-objects");
343
344 pipe_fd = xfdopen(pack_objects.in, "w");
345
346 if (pack_data->shallow_nr)
347 for_each_commit_graft(write_one_shallow, pipe_fd);
348
349 for (i = 0; i < pack_data->want_obj.nr; i++)
350 fprintf(pipe_fd, "%s\n",
351 oid_to_hex(&pack_data->want_obj.objects[i].item->oid));
352 fprintf(pipe_fd, "--not\n");
353 for (i = 0; i < pack_data->have_obj.nr; i++)
354 fprintf(pipe_fd, "%s\n",
355 oid_to_hex(&pack_data->have_obj.objects[i].item->oid));
356 for (i = 0; i < pack_data->extra_edge_obj.nr; i++)
357 fprintf(pipe_fd, "%s\n",
358 oid_to_hex(&pack_data->extra_edge_obj.objects[i].item->oid));
359 fprintf(pipe_fd, "\n");
360 fflush(pipe_fd);
361 fclose(pipe_fd);
362
363 /* We read from pack_objects.err to capture stderr output for
364 * progress bar, and pack_objects.out to capture the pack data.
365 */
366
367 while (1) {
368 struct pollfd pfd[2];
369 int pe, pu, pollsize, polltimeout;
370 int ret;
371
372 reset_timeout(pack_data->timeout);
373
374 pollsize = 0;
375 pe = pu = -1;
376
377 if (0 <= pack_objects.out) {
378 pfd[pollsize].fd = pack_objects.out;
379 pfd[pollsize].events = POLLIN;
380 pu = pollsize;
381 pollsize++;
382 }
383 if (0 <= pack_objects.err) {
384 pfd[pollsize].fd = pack_objects.err;
385 pfd[pollsize].events = POLLIN;
386 pe = pollsize;
387 pollsize++;
388 }
389
390 if (!pollsize)
391 break;
392
393 polltimeout = pack_data->keepalive < 0
394 ? -1
395 : 1000 * pack_data->keepalive;
396
397 ret = poll(pfd, pollsize, polltimeout);
398
399 if (ret < 0) {
400 if (errno != EINTR) {
401 error_errno("poll failed, resuming");
402 sleep(1);
403 }
404 continue;
405 }
406 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
407 /* Status ready; we ship that in the side-band
408 * or dump to the standard error.
409 */
410 sz = xread(pack_objects.err, progress,
411 sizeof(progress));
412 if (0 < sz)
413 send_client_data(2, progress, sz,
414 pack_data->use_sideband);
415 else if (sz == 0) {
416 close(pack_objects.err);
417 pack_objects.err = -1;
418 }
419 else
420 goto fail;
421 /* give priority to status messages */
422 continue;
423 }
424 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
425 int result = relay_pack_data(pack_objects.out,
426 output_state,
427 pack_data->use_sideband,
428 !!uri_protocols);
429
430 if (result == 0) {
431 close(pack_objects.out);
432 pack_objects.out = -1;
433 } else if (result < 0) {
434 goto fail;
435 }
436 }
437
438 /*
439 * We hit the keepalive timeout without saying anything; send
440 * an empty message on the data sideband just to let the other
441 * side know we're still working on it, but don't have any data
442 * yet.
443 *
444 * If we don't have a sideband channel, there's no room in the
445 * protocol to say anything, so those clients are just out of
446 * luck.
447 */
448 if (!ret && pack_data->use_sideband) {
449 static const char buf[] = "0005\1";
450 write_or_die(1, buf, 5);
451 }
452 }
453
454 if (finish_command(&pack_objects)) {
455 error("git upload-pack: git-pack-objects died with error.");
456 goto fail;
457 }
458
459 /* flush the data */
460 if (output_state->used > 0) {
461 send_client_data(1, output_state->buffer, output_state->used,
462 pack_data->use_sideband);
463 fprintf(stderr, "flushed.\n");
464 }
465 free(output_state);
466 if (pack_data->use_sideband)
467 packet_flush(1);
468 return;
469
470 fail:
471 free(output_state);
472 send_client_data(3, abort_msg, strlen(abort_msg),
473 pack_data->use_sideband);
474 die("git upload-pack: %s", abort_msg);
475 }
476
477 static int do_got_oid(struct upload_pack_data *data, const struct object_id *oid)
478 {
479 int we_knew_they_have = 0;
480 struct object *o = parse_object_with_flags(the_repository, oid,
481 PARSE_OBJECT_SKIP_HASH_CHECK |
482 PARSE_OBJECT_DISCARD_TREE);
483
484 if (!o)
485 die("oops (%s)", oid_to_hex(oid));
486 if (o->type == OBJ_COMMIT) {
487 struct commit_list *parents;
488 struct commit *commit = (struct commit *)o;
489 if (o->flags & THEY_HAVE)
490 we_knew_they_have = 1;
491 else
492 o->flags |= THEY_HAVE;
493 if (!data->oldest_have || (commit->date < data->oldest_have))
494 data->oldest_have = commit->date;
495 for (parents = commit->parents;
496 parents;
497 parents = parents->next)
498 parents->item->object.flags |= THEY_HAVE;
499 }
500 if (!we_knew_they_have) {
501 add_object_array(o, NULL, &data->have_obj);
502 return 1;
503 }
504 return 0;
505 }
506
507 static int got_oid(struct upload_pack_data *data,
508 const char *hex, struct object_id *oid)
509 {
510 if (get_oid_hex(hex, oid))
511 die("git upload-pack: expected SHA1 object, got '%s'", hex);
512 if (!odb_has_object(the_repository->objects, oid, 0))
513 return -1;
514 return do_got_oid(data, oid);
515 }
516
517 static int ok_to_give_up(struct upload_pack_data *data)
518 {
519 timestamp_t min_generation = GENERATION_NUMBER_ZERO;
520
521 if (!data->have_obj.nr)
522 return 0;
523
524 return can_all_from_reach_with_flag(&data->want_obj, THEY_HAVE,
525 COMMON_KNOWN, data->oldest_have,
526 min_generation);
527 }
528
529 static int get_common_commits(struct upload_pack_data *data,
530 struct packet_reader *reader)
531 {
532 struct object_id oid;
533 char last_hex[GIT_MAX_HEXSZ + 1];
534 int got_common = 0;
535 int got_other = 0;
536 int sent_ready = 0;
537
538 for (;;) {
539 const char *arg;
540
541 reset_timeout(data->timeout);
542
543 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
544 if (data->multi_ack == MULTI_ACK_DETAILED
545 && got_common
546 && !got_other
547 && ok_to_give_up(data)) {
548 sent_ready = 1;
549 packet_write_fmt(1, "ACK %s ready\n", last_hex);
550 }
551 if (data->have_obj.nr == 0 || data->multi_ack)
552 packet_write_fmt(1, "NAK\n");
553
554 if (data->no_done && sent_ready) {
555 packet_write_fmt(1, "ACK %s\n", last_hex);
556 return 0;
557 }
558 if (data->stateless_rpc)
559 exit(0);
560 got_common = 0;
561 got_other = 0;
562 continue;
563 }
564 if (skip_prefix(reader->line, "have ", &arg)) {
565 switch (got_oid(data, arg, &oid)) {
566 case -1: /* they have what we do not */
567 got_other = 1;
568 if (data->multi_ack
569 && ok_to_give_up(data)) {
570 const char *hex = oid_to_hex(&oid);
571 if (data->multi_ack == MULTI_ACK_DETAILED) {
572 sent_ready = 1;
573 packet_write_fmt(1, "ACK %s ready\n", hex);
574 } else
575 packet_write_fmt(1, "ACK %s continue\n", hex);
576 }
577 break;
578 default:
579 got_common = 1;
580 oid_to_hex_r(last_hex, &oid);
581 if (data->multi_ack == MULTI_ACK_DETAILED)
582 packet_write_fmt(1, "ACK %s common\n", last_hex);
583 else if (data->multi_ack)
584 packet_write_fmt(1, "ACK %s continue\n", last_hex);
585 else if (data->have_obj.nr == 1)
586 packet_write_fmt(1, "ACK %s\n", last_hex);
587 break;
588 }
589 continue;
590 }
591 if (!strcmp(reader->line, "done")) {
592 if (data->have_obj.nr > 0) {
593 if (data->multi_ack)
594 packet_write_fmt(1, "ACK %s\n", last_hex);
595 return 0;
596 }
597 packet_write_fmt(1, "NAK\n");
598 return -1;
599 }
600 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
601 }
602 }
603
604 static int allow_hidden_refs(enum allow_uor allow_uor)
605 {
606 if ((allow_uor & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1)
607 return 1;
608 return !(allow_uor & (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
609 }
610
611 static void for_each_namespaced_ref_1(each_ref_fn fn,
612 struct upload_pack_data *data)
613 {
614 const char **excludes = NULL;
615 /*
616 * If `data->allow_uor` allows fetching hidden refs, we need to
617 * mark all references (including hidden ones), to check in
618 * `is_our_ref()` below.
619 *
620 * Otherwise, we only care about whether each reference's object
621 * has the OUR_REF bit set or not, so do not need to visit
622 * hidden references.
623 */
624 if (allow_hidden_refs(data->allow_uor))
625 excludes = hidden_refs_to_excludes(&data->hidden_refs);
626
627 refs_for_each_namespaced_ref(get_main_ref_store(the_repository),
628 excludes, fn, data);
629 }
630
631
632 static int is_our_ref(struct object *o, enum allow_uor allow_uor)
633 {
634 return o->flags & ((allow_hidden_refs(allow_uor) ? 0 : HIDDEN_REF) | OUR_REF);
635 }
636
637 /*
638 * on successful case, it's up to the caller to close cmd->out
639 */
640 static int do_reachable_revlist(struct child_process *cmd,
641 struct object_array *src,
642 struct object_array *reachable,
643 enum allow_uor allow_uor)
644 {
645 struct object *o;
646 FILE *cmd_in = NULL;
647 int i;
648
649 strvec_pushl(&cmd->args, "rev-list", "--stdin", NULL);
650 cmd->git_cmd = 1;
651 cmd->no_stderr = 1;
652 cmd->in = -1;
653 cmd->out = -1;
654
655 /*
656 * If the next rev-list --stdin encounters an unknown commit,
657 * it terminates, which will cause SIGPIPE in the write loop
658 * below.
659 */
660 sigchain_push(SIGPIPE, SIG_IGN);
661
662 if (start_command(cmd))
663 goto error;
664
665 cmd_in = xfdopen(cmd->in, "w");
666
667 for (i = get_max_object_index(the_repository); 0 < i; ) {
668 o = get_indexed_object(the_repository, --i);
669 if (!o)
670 continue;
671 if (reachable && o->type == OBJ_COMMIT)
672 o->flags &= ~TMP_MARK;
673 if (!is_our_ref(o, allow_uor))
674 continue;
675 if (fprintf(cmd_in, "^%s\n", oid_to_hex(&o->oid)) < 0)
676 goto error;
677 }
678 for (i = 0; i < src->nr; i++) {
679 o = src->objects[i].item;
680 if (is_our_ref(o, allow_uor)) {
681 if (reachable)
682 add_object_array(o, NULL, reachable);
683 continue;
684 }
685 if (reachable && o->type == OBJ_COMMIT)
686 o->flags |= TMP_MARK;
687 if (fprintf(cmd_in, "%s\n", oid_to_hex(&o->oid)) < 0)
688 goto error;
689 }
690 if (ferror(cmd_in) || fflush(cmd_in))
691 goto error;
692 fclose(cmd_in);
693 cmd->in = -1;
694 sigchain_pop(SIGPIPE);
695
696 return 0;
697
698 error:
699 sigchain_pop(SIGPIPE);
700
701 if (cmd_in)
702 fclose(cmd_in);
703 if (cmd->out >= 0)
704 close(cmd->out);
705 return -1;
706 }
707
708 static int get_reachable_list(struct upload_pack_data *data,
709 struct object_array *reachable)
710 {
711 struct child_process cmd = CHILD_PROCESS_INIT;
712 int i;
713 struct object *o;
714 char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
715 const unsigned hexsz = the_hash_algo->hexsz;
716 int ret;
717
718 if (do_reachable_revlist(&cmd, &data->shallows, reachable,
719 data->allow_uor) < 0) {
720 ret = -1;
721 goto out;
722 }
723
724 while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
725 struct object_id oid;
726 const char *p;
727
728 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
729 break;
730
731 o = lookup_object(the_repository, &oid);
732 if (o && o->type == OBJ_COMMIT) {
733 o->flags &= ~TMP_MARK;
734 }
735 }
736 for (i = get_max_object_index(the_repository); 0 < i; i--) {
737 o = get_indexed_object(the_repository, i - 1);
738 if (o && o->type == OBJ_COMMIT &&
739 (o->flags & TMP_MARK)) {
740 add_object_array(o, NULL, reachable);
741 o->flags &= ~TMP_MARK;
742 }
743 }
744 close(cmd.out);
745
746 if (finish_command(&cmd)) {
747 ret = -1;
748 goto out;
749 }
750
751 ret = 0;
752
753 out:
754 child_process_clear(&cmd);
755 return ret;
756 }
757
758 static int has_unreachable(struct object_array *src, enum allow_uor allow_uor)
759 {
760 struct child_process cmd = CHILD_PROCESS_INIT;
761 char buf[1];
762 int i;
763
764 if (do_reachable_revlist(&cmd, src, NULL, allow_uor) < 0)
765 goto error;
766
767 /*
768 * The commits out of the rev-list are not ancestors of
769 * our ref.
770 */
771 i = read_in_full(cmd.out, buf, 1);
772 if (i)
773 goto error;
774 close(cmd.out);
775 cmd.out = -1;
776
777 /*
778 * rev-list may have died by encountering a bad commit
779 * in the history, in which case we do want to bail out
780 * even when it showed no commit.
781 */
782 if (finish_command(&cmd))
783 goto error;
784
785 /* All the non-tip ones are ancestors of what we advertised */
786 return 0;
787
788 error:
789 if (cmd.out >= 0)
790 close(cmd.out);
791 child_process_clear(&cmd);
792 return 1;
793 }
794
795 static void check_non_tip(struct upload_pack_data *data)
796 {
797 int i;
798
799 /*
800 * In the normal in-process case without
801 * uploadpack.allowReachableSHA1InWant,
802 * non-tip requests can never happen.
803 */
804 if (!data->stateless_rpc && !(data->allow_uor & ALLOW_REACHABLE_SHA1))
805 goto error;
806 if (!has_unreachable(&data->want_obj, data->allow_uor))
807 /* All the non-tip ones are ancestors of what we advertised */
808 return;
809
810 error:
811 /* Pick one of them (we know there at least is one) */
812 for (i = 0; i < data->want_obj.nr; i++) {
813 struct object *o = data->want_obj.objects[i].item;
814 if (!is_our_ref(o, data->allow_uor)) {
815 error("git upload-pack: not our ref %s",
816 oid_to_hex(&o->oid));
817 packet_writer_error(&data->writer,
818 "upload-pack: not our ref %s",
819 oid_to_hex(&o->oid));
820 exit(128);
821 }
822 }
823 }
824
825 static void send_shallow(struct upload_pack_data *data,
826 struct commit_list *result)
827 {
828 while (result) {
829 struct object *object = &result->item->object;
830 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
831 packet_writer_write(&data->writer, "shallow %s",
832 oid_to_hex(&object->oid));
833 register_shallow(the_repository, &object->oid);
834 data->shallow_nr++;
835 }
836 result = result->next;
837 }
838 }
839
840 static void send_unshallow(struct upload_pack_data *data)
841 {
842 int i;
843
844 for (i = 0; i < data->shallows.nr; i++) {
845 struct object *object = data->shallows.objects[i].item;
846 if (object->flags & NOT_SHALLOW) {
847 struct commit_list *parents;
848 packet_writer_write(&data->writer, "unshallow %s",
849 oid_to_hex(&object->oid));
850 object->flags &= ~CLIENT_SHALLOW;
851 /*
852 * We want to _register_ "object" as shallow, but we
853 * also need to traverse object's parents to deepen a
854 * shallow clone. Unregister it for now so we can
855 * parse and add the parents to the want list, then
856 * re-register it.
857 */
858 unregister_shallow(&object->oid);
859 object->parsed = 0;
860 parse_commit_or_die((struct commit *)object);
861 parents = ((struct commit *)object)->parents;
862 while (parents) {
863 add_object_array(&parents->item->object,
864 NULL, &data->want_obj);
865 parents = parents->next;
866 }
867 add_object_array(object, NULL, &data->extra_edge_obj);
868 }
869 /* make sure commit traversal conforms to client */
870 register_shallow(the_repository, &object->oid);
871 }
872 }
873
874 static int check_ref(const char *refname_full, const char *referent UNUSED, const struct object_id *oid,
875 int flag, void *cb_data);
876 static void deepen(struct upload_pack_data *data, int depth)
877 {
878 if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
879 int i;
880
881 for (i = 0; i < data->shallows.nr; i++) {
882 struct object *object = data->shallows.objects[i].item;
883 object->flags |= NOT_SHALLOW;
884 }
885 } else if (data->deepen_relative) {
886 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
887 struct commit_list *result;
888
889 /*
890 * Checking for reachable shallows requires that our refs be
891 * marked with OUR_REF.
892 */
893 refs_head_ref_namespaced(get_main_ref_store(the_repository),
894 check_ref, data);
895 for_each_namespaced_ref_1(check_ref, data);
896
897 get_reachable_list(data, &reachable_shallows);
898 result = get_shallow_commits(&reachable_shallows,
899 depth + 1,
900 SHALLOW, NOT_SHALLOW);
901 send_shallow(data, result);
902 free_commit_list(result);
903 object_array_clear(&reachable_shallows);
904 } else {
905 struct commit_list *result;
906
907 result = get_shallow_commits(&data->want_obj, depth,
908 SHALLOW, NOT_SHALLOW);
909 send_shallow(data, result);
910 free_commit_list(result);
911 }
912
913 send_unshallow(data);
914 }
915
916 static void deepen_by_rev_list(struct upload_pack_data *data,
917 int ac,
918 const char **av)
919 {
920 struct commit_list *result;
921
922 disable_commit_graph(the_repository);
923 result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
924 send_shallow(data, result);
925 free_commit_list(result);
926 send_unshallow(data);
927 }
928
929 /* Returns 1 if a shallow list is sent or 0 otherwise */
930 static int send_shallow_list(struct upload_pack_data *data)
931 {
932 int ret = 0;
933
934 if (data->depth > 0 && data->deepen_rev_list)
935 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
936 if (data->depth > 0) {
937 deepen(data, data->depth);
938 ret = 1;
939 } else if (data->deepen_rev_list) {
940 struct strvec av = STRVEC_INIT;
941 int i;
942
943 strvec_push(&av, "rev-list");
944 if (data->deepen_since)
945 strvec_pushf(&av, "--max-age=%"PRItime, data->deepen_since);
946 if (oidset_size(&data->deepen_not)) {
947 const struct object_id *oid;
948 struct oidset_iter iter;
949 strvec_push(&av, "--not");
950 oidset_iter_init(&data->deepen_not, &iter);
951 while ((oid = oidset_iter_next(&iter)))
952 strvec_push(&av, oid_to_hex(oid));
953 strvec_push(&av, "--not");
954 }
955 for (i = 0; i < data->want_obj.nr; i++) {
956 struct object *o = data->want_obj.objects[i].item;
957 strvec_push(&av, oid_to_hex(&o->oid));
958 }
959 deepen_by_rev_list(data, av.nr, av.v);
960 strvec_clear(&av);
961 ret = 1;
962 } else {
963 if (data->shallows.nr > 0) {
964 int i;
965 for (i = 0; i < data->shallows.nr; i++)
966 register_shallow(the_repository,
967 &data->shallows.objects[i].item->oid);
968 }
969 }
970
971 data->shallow_nr += data->shallows.nr;
972 return ret;
973 }
974
975 static int process_shallow(const char *line, struct object_array *shallows)
976 {
977 const char *arg;
978 if (skip_prefix(line, "shallow ", &arg)) {
979 struct object_id oid;
980 struct object *object;
981 if (get_oid_hex(arg, &oid))
982 die("invalid shallow line: %s", line);
983 object = parse_object(the_repository, &oid);
984 if (!object)
985 return 1;
986 if (object->type != OBJ_COMMIT)
987 die("invalid shallow object %s", oid_to_hex(&oid));
988 if (!(object->flags & CLIENT_SHALLOW)) {
989 object->flags |= CLIENT_SHALLOW;
990 add_object_array(object, NULL, shallows);
991 }
992 return 1;
993 }
994
995 return 0;
996 }
997
998 static int process_deepen(const char *line, int *depth)
999 {
1000 const char *arg;
1001 if (skip_prefix(line, "deepen ", &arg)) {
1002 char *end = NULL;
1003 *depth = (int)strtol(arg, &end, 0);
1004 if (!end || *end || *depth <= 0)
1005 die("Invalid deepen: %s", line);
1006 return 1;
1007 }
1008
1009 return 0;
1010 }
1011
1012 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
1013 {
1014 const char *arg;
1015 if (skip_prefix(line, "deepen-since ", &arg)) {
1016 char *end = NULL;
1017 *deepen_since = parse_timestamp(arg, &end, 0);
1018 if (!end || *end || !deepen_since ||
1019 /* revisions.c's max_age -1 is special */
1020 *deepen_since == -1)
1021 die("Invalid deepen-since: %s", line);
1022 *deepen_rev_list = 1;
1023 return 1;
1024 }
1025 return 0;
1026 }
1027
1028 static int process_deepen_not(const char *line, struct oidset *deepen_not, int *deepen_rev_list)
1029 {
1030 const char *arg;
1031 if (skip_prefix(line, "deepen-not ", &arg)) {
1032 int cnt;
1033 char *ref = NULL;
1034 struct object_id oid;
1035 cnt = expand_ref(the_repository, arg, strlen(arg), &oid, &ref);
1036 if (cnt > 1)
1037 die("git upload-pack: ambiguous deepen-not: %s", line);
1038 if (cnt < 1)
1039 die("git upload-pack: deepen-not is not a ref: %s", line);
1040 oidset_insert(deepen_not, &oid);
1041 free(ref);
1042 *deepen_rev_list = 1;
1043 return 1;
1044 }
1045 return 0;
1046 }
1047
1048 NORETURN __attribute__((format(printf,2,3)))
1049 static void send_err_and_die(struct upload_pack_data *data,
1050 const char *fmt, ...)
1051 {
1052 struct strbuf buf = STRBUF_INIT;
1053 va_list ap;
1054
1055 va_start(ap, fmt);
1056 strbuf_vaddf(&buf, fmt, ap);
1057 va_end(ap);
1058
1059 packet_writer_error(&data->writer, "%s", buf.buf);
1060 die("%s", buf.buf);
1061 }
1062
1063 static void check_one_filter(struct upload_pack_data *data,
1064 struct list_objects_filter_options *opts)
1065 {
1066 const char *key = list_object_filter_config_name(opts->choice);
1067 struct string_list_item *item = string_list_lookup(&data->allowed_filters,
1068 key);
1069 int allowed;
1070
1071 if (item)
1072 allowed = (intptr_t)item->util;
1073 else
1074 allowed = data->allow_filter_fallback;
1075
1076 if (!allowed)
1077 send_err_and_die(data, "filter '%s' not supported", key);
1078
1079 if (opts->choice == LOFC_TREE_DEPTH &&
1080 opts->tree_exclude_depth > data->tree_filter_max_depth)
1081 send_err_and_die(data,
1082 "tree filter allows max depth %lu, but got %lu",
1083 data->tree_filter_max_depth,
1084 opts->tree_exclude_depth);
1085 }
1086
1087 static void check_filter_recurse(struct upload_pack_data *data,
1088 struct list_objects_filter_options *opts)
1089 {
1090 size_t i;
1091
1092 check_one_filter(data, opts);
1093 if (opts->choice != LOFC_COMBINE)
1094 return;
1095
1096 for (i = 0; i < opts->sub_nr; i++)
1097 check_filter_recurse(data, &opts->sub[i]);
1098 }
1099
1100 static void die_if_using_banned_filter(struct upload_pack_data *data)
1101 {
1102 check_filter_recurse(data, &data->filter_options);
1103 }
1104
1105 static void receive_needs(struct upload_pack_data *data,
1106 struct packet_reader *reader)
1107 {
1108 int has_non_tip = 0;
1109
1110 data->shallow_nr = 0;
1111 for (;;) {
1112 struct object *o;
1113 const char *features;
1114 struct object_id oid_buf;
1115 const char *arg;
1116 size_t feature_len;
1117
1118 reset_timeout(data->timeout);
1119 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
1120 break;
1121
1122 if (process_shallow(reader->line, &data->shallows))
1123 continue;
1124 if (process_deepen(reader->line, &data->depth))
1125 continue;
1126 if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
1127 continue;
1128 if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
1129 continue;
1130
1131 if (skip_prefix(reader->line, "filter ", &arg)) {
1132 if (!data->filter_capability_requested)
1133 die("git upload-pack: filtering capability not negotiated");
1134 list_objects_filter_die_if_populated(&data->filter_options);
1135 parse_list_objects_filter(&data->filter_options, arg);
1136 die_if_using_banned_filter(data);
1137 continue;
1138 }
1139
1140 if (!skip_prefix(reader->line, "want ", &arg) ||
1141 parse_oid_hex(arg, &oid_buf, &features))
1142 die("git upload-pack: protocol error, "
1143 "expected to get object ID, not '%s'", reader->line);
1144
1145 if (parse_feature_request(features, "deepen-relative"))
1146 data->deepen_relative = 1;
1147 if (parse_feature_request(features, "multi_ack_detailed"))
1148 data->multi_ack = MULTI_ACK_DETAILED;
1149 else if (parse_feature_request(features, "multi_ack"))
1150 data->multi_ack = MULTI_ACK;
1151 if (parse_feature_request(features, "no-done"))
1152 data->no_done = 1;
1153 if (parse_feature_request(features, "thin-pack"))
1154 data->use_thin_pack = 1;
1155 if (parse_feature_request(features, "ofs-delta"))
1156 data->use_ofs_delta = 1;
1157 if (parse_feature_request(features, "side-band-64k"))
1158 data->use_sideband = LARGE_PACKET_MAX;
1159 else if (parse_feature_request(features, "side-band"))
1160 data->use_sideband = DEFAULT_PACKET_MAX;
1161 if (parse_feature_request(features, "no-progress"))
1162 data->no_progress = 1;
1163 if (parse_feature_request(features, "include-tag"))
1164 data->use_include_tag = 1;
1165 if (data->allow_filter &&
1166 parse_feature_request(features, "filter"))
1167 data->filter_capability_requested = 1;
1168
1169 arg = parse_feature_value(features, "session-id", &feature_len, NULL);
1170 if (arg) {
1171 char *client_sid = xstrndup(arg, feature_len);
1172 trace2_data_string("transfer", NULL, "client-sid", client_sid);
1173 free(client_sid);
1174 }
1175
1176 o = parse_object_with_flags(the_repository, &oid_buf,
1177 PARSE_OBJECT_SKIP_HASH_CHECK |
1178 PARSE_OBJECT_DISCARD_TREE);
1179 if (!o) {
1180 packet_writer_error(&data->writer,
1181 "upload-pack: not our ref %s",
1182 oid_to_hex(&oid_buf));
1183 die("git upload-pack: not our ref %s",
1184 oid_to_hex(&oid_buf));
1185 }
1186 if (!(o->flags & WANTED)) {
1187 o->flags |= WANTED;
1188 if (!((data->allow_uor & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
1189 || is_our_ref(o, data->allow_uor)))
1190 has_non_tip = 1;
1191 add_object_array(o, NULL, &data->want_obj);
1192 }
1193 }
1194
1195 /*
1196 * We have sent all our refs already, and the other end
1197 * should have chosen out of them. When we are operating
1198 * in the stateless RPC mode, however, their choice may
1199 * have been based on the set of older refs advertised
1200 * by another process that handled the initial request.
1201 */
1202 if (has_non_tip)
1203 check_non_tip(data);
1204
1205 if (!data->use_sideband && data->daemon_mode)
1206 data->no_progress = 1;
1207
1208 if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1209 return;
1210
1211 if (send_shallow_list(data))
1212 packet_flush(1);
1213 }
1214
1215 /* return non-zero if the ref is hidden, otherwise 0 */
1216 static int mark_our_ref(const char *refname, const char *refname_full,
1217 const struct object_id *oid, const struct strvec *hidden_refs)
1218 {
1219 struct object *o = lookup_unknown_object(the_repository, oid);
1220
1221 if (ref_is_hidden(refname, refname_full, hidden_refs)) {
1222 o->flags |= HIDDEN_REF;
1223 return 1;
1224 }
1225 o->flags |= OUR_REF;
1226 return 0;
1227 }
1228
1229 static int check_ref(const char *refname_full, const char *referent UNUSED,const struct object_id *oid,
1230 int flag UNUSED, void *cb_data)
1231 {
1232 const char *refname = strip_namespace(refname_full);
1233 struct upload_pack_data *data = cb_data;
1234
1235 mark_our_ref(refname, refname_full, oid, &data->hidden_refs);
1236 return 0;
1237 }
1238
1239 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1240 {
1241 struct string_list_item *item;
1242
1243 if (!symref->nr)
1244 return;
1245 for_each_string_list_item(item, symref)
1246 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1247 }
1248
1249 static void format_session_id(struct strbuf *buf, struct upload_pack_data *d) {
1250 if (d->advertise_sid)
1251 strbuf_addf(buf, " session-id=%s", trace2_session_id());
1252 }
1253
1254 static void write_v0_ref(struct upload_pack_data *data,
1255 const char *refname, const char *refname_nons,
1256 const struct object_id *oid)
1257 {
1258 static const char *capabilities = "multi_ack thin-pack side-band"
1259 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1260 " deepen-relative no-progress include-tag multi_ack_detailed";
1261 struct object_id peeled;
1262
1263 if (mark_our_ref(refname_nons, refname, oid, &data->hidden_refs))
1264 return;
1265
1266 if (capabilities) {
1267 struct strbuf symref_info = STRBUF_INIT;
1268 struct strbuf session_id = STRBUF_INIT;
1269
1270 format_symref_info(&symref_info, &data->symref);
1271 format_session_id(&session_id, data);
1272 packet_fwrite_fmt(stdout, "%s %s%c%s%s%s%s%s%s%s object-format=%s agent=%s\n",
1273 oid_to_hex(oid), refname_nons,
1274 0, capabilities,
1275 (data->allow_uor & ALLOW_TIP_SHA1) ?
1276 " allow-tip-sha1-in-want" : "",
1277 (data->allow_uor & ALLOW_REACHABLE_SHA1) ?
1278 " allow-reachable-sha1-in-want" : "",
1279 data->no_done ? " no-done" : "",
1280 symref_info.buf,
1281 data->allow_filter ? " filter" : "",
1282 session_id.buf,
1283 the_hash_algo->name,
1284 git_user_agent_sanitized());
1285 strbuf_release(&symref_info);
1286 strbuf_release(&session_id);
1287 data->sent_capabilities = 1;
1288 } else {
1289 packet_fwrite_fmt(stdout, "%s %s\n", oid_to_hex(oid), refname_nons);
1290 }
1291 capabilities = NULL;
1292 if (!peel_iterated_oid(the_repository, oid, &peeled))
1293 packet_fwrite_fmt(stdout, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1294 return;
1295 }
1296
1297 static int send_ref(const char *refname, const char *referent UNUSED, const struct object_id *oid,
1298 int flag UNUSED, void *cb_data)
1299 {
1300 write_v0_ref(cb_data, refname, strip_namespace(refname), oid);
1301 return 0;
1302 }
1303
1304 static int find_symref(const char *refname, const char *referent UNUSED,
1305 const struct object_id *oid UNUSED,
1306 int flag, void *cb_data)
1307 {
1308 const char *symref_target;
1309 struct string_list_item *item;
1310
1311 if ((flag & REF_ISSYMREF) == 0)
1312 return 0;
1313 symref_target = refs_resolve_ref_unsafe(get_main_ref_store(the_repository),
1314 refname, 0, NULL, &flag);
1315 if (!symref_target || (flag & REF_ISSYMREF) == 0)
1316 die("'%s' is a symref but it is not?", refname);
1317 item = string_list_append(cb_data, strip_namespace(refname));
1318 item->util = xstrdup(strip_namespace(symref_target));
1319 return 0;
1320 }
1321
1322 static int parse_object_filter_config(const char *var, const char *value,
1323 const struct key_value_info *kvi,
1324 struct upload_pack_data *data)
1325 {
1326 struct strbuf buf = STRBUF_INIT;
1327 const char *sub, *key;
1328 size_t sub_len;
1329
1330 if (parse_config_key(var, "uploadpackfilter", &sub, &sub_len, &key))
1331 return 0;
1332
1333 if (!sub) {
1334 if (!strcmp(key, "allow"))
1335 data->allow_filter_fallback = git_config_bool(var, value);
1336 return 0;
1337 }
1338
1339 strbuf_add(&buf, sub, sub_len);
1340
1341 if (!strcmp(key, "allow"))
1342 string_list_insert(&data->allowed_filters, buf.buf)->util =
1343 (void *)(intptr_t)git_config_bool(var, value);
1344 else if (!strcmp(buf.buf, "tree") && !strcmp(key, "maxdepth")) {
1345 if (!value) {
1346 strbuf_release(&buf);
1347 return config_error_nonbool(var);
1348 }
1349 string_list_insert(&data->allowed_filters, buf.buf)->util =
1350 (void *)(intptr_t)1;
1351 data->tree_filter_max_depth = git_config_ulong(var, value,
1352 kvi);
1353 }
1354
1355 strbuf_release(&buf);
1356 return 0;
1357 }
1358
1359 static int upload_pack_config(const char *var, const char *value,
1360 const struct config_context *ctx,
1361 void *cb_data)
1362 {
1363 struct upload_pack_data *data = cb_data;
1364
1365 if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1366 if (git_config_bool(var, value))
1367 data->allow_uor |= ALLOW_TIP_SHA1;
1368 else
1369 data->allow_uor &= ~ALLOW_TIP_SHA1;
1370 } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1371 if (git_config_bool(var, value))
1372 data->allow_uor |= ALLOW_REACHABLE_SHA1;
1373 else
1374 data->allow_uor &= ~ALLOW_REACHABLE_SHA1;
1375 } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1376 if (git_config_bool(var, value))
1377 data->allow_uor |= ALLOW_ANY_SHA1;
1378 else
1379 data->allow_uor &= ~ALLOW_ANY_SHA1;
1380 } else if (!strcmp("uploadpack.keepalive", var)) {
1381 data->keepalive = git_config_int(var, value, ctx->kvi);
1382 if (!data->keepalive)
1383 data->keepalive = -1;
1384 } else if (!strcmp("uploadpack.allowfilter", var)) {
1385 data->allow_filter = git_config_bool(var, value);
1386 } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1387 data->allow_ref_in_want = git_config_bool(var, value);
1388 } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1389 data->allow_sideband_all = git_config_bool(var, value);
1390 } else if (!strcmp("uploadpack.blobpackfileuri", var)) {
1391 if (value)
1392 data->allow_packfile_uris = 1;
1393 } else if (!strcmp("core.precomposeunicode", var)) {
1394 precomposed_unicode = git_config_bool(var, value);
1395 } else if (!strcmp("transfer.advertisesid", var)) {
1396 data->advertise_sid = git_config_bool(var, value);
1397 }
1398
1399 if (parse_object_filter_config(var, value, ctx->kvi, data) < 0)
1400 return -1;
1401
1402 return parse_hide_refs_config(var, value, "uploadpack", &data->hidden_refs);
1403 }
1404
1405 static int upload_pack_protected_config(const char *var, const char *value,
1406 const struct config_context *ctx UNUSED,
1407 void *cb_data)
1408 {
1409 struct upload_pack_data *data = cb_data;
1410
1411 if (!strcmp("uploadpack.packobjectshook", var))
1412 return git_config_string(&data->pack_objects_hook, var, value);
1413 return 0;
1414 }
1415
1416 static void get_upload_pack_config(struct repository *r,
1417 struct upload_pack_data *data)
1418 {
1419 repo_config(r, upload_pack_config, data);
1420 git_protected_config(upload_pack_protected_config, data);
1421
1422 data->allow_sideband_all |= git_env_bool("GIT_TEST_SIDEBAND_ALL", 0);
1423 }
1424
1425 void upload_pack(const int advertise_refs, const int stateless_rpc,
1426 const int timeout)
1427 {
1428 struct packet_reader reader;
1429 struct upload_pack_data data;
1430
1431 upload_pack_data_init(&data);
1432 get_upload_pack_config(the_repository, &data);
1433
1434 data.stateless_rpc = stateless_rpc;
1435 data.timeout = timeout;
1436 if (data.timeout)
1437 data.daemon_mode = 1;
1438
1439 refs_head_ref_namespaced(get_main_ref_store(the_repository),
1440 find_symref, &data.symref);
1441
1442 if (advertise_refs || !data.stateless_rpc) {
1443 reset_timeout(data.timeout);
1444 if (advertise_refs)
1445 data.no_done = 1;
1446 refs_head_ref_namespaced(get_main_ref_store(the_repository),
1447 send_ref, &data);
1448 for_each_namespaced_ref_1(send_ref, &data);
1449 if (!data.sent_capabilities) {
1450 const char *refname = "capabilities^{}";
1451 write_v0_ref(&data, refname, refname, null_oid(the_hash_algo));
1452 }
1453 /*
1454 * fflush stdout before calling advertise_shallow_grafts because send_ref
1455 * uses stdio.
1456 */
1457 fflush_or_die(stdout);
1458 advertise_shallow_grafts(1);
1459 packet_flush(1);
1460 } else {
1461 refs_head_ref_namespaced(get_main_ref_store(the_repository),
1462 check_ref, &data);
1463 for_each_namespaced_ref_1(check_ref, &data);
1464 }
1465
1466 if (!advertise_refs) {
1467 packet_reader_init(&reader, 0, NULL, 0,
1468 PACKET_READ_CHOMP_NEWLINE |
1469 PACKET_READ_DIE_ON_ERR_PACKET);
1470
1471 receive_needs(&data, &reader);
1472
1473 /*
1474 * An EOF at this exact point in negotiation should be
1475 * acceptable from stateless clients as they will consume the
1476 * shallow list before doing subsequent rpc with haves/etc.
1477 */
1478 if (data.stateless_rpc)
1479 reader.options |= PACKET_READ_GENTLE_ON_EOF;
1480
1481 if (data.want_obj.nr &&
1482 packet_reader_peek(&reader) != PACKET_READ_EOF) {
1483 reader.options &= ~PACKET_READ_GENTLE_ON_EOF;
1484 get_common_commits(&data, &reader);
1485 create_pack_file(&data, NULL);
1486 }
1487 }
1488
1489 upload_pack_data_clear(&data);
1490 }
1491
1492 static int parse_want(struct packet_writer *writer, const char *line,
1493 struct object_array *want_obj)
1494 {
1495 const char *arg;
1496 if (skip_prefix(line, "want ", &arg)) {
1497 struct object_id oid;
1498 struct object *o;
1499
1500 if (get_oid_hex(arg, &oid))
1501 die("git upload-pack: protocol error, "
1502 "expected to get oid, not '%s'", line);
1503
1504 o = parse_object_with_flags(the_repository, &oid,
1505 PARSE_OBJECT_SKIP_HASH_CHECK |
1506 PARSE_OBJECT_DISCARD_TREE);
1507
1508 if (!o) {
1509 packet_writer_error(writer,
1510 "upload-pack: not our ref %s",
1511 oid_to_hex(&oid));
1512 die("git upload-pack: not our ref %s",
1513 oid_to_hex(&oid));
1514 }
1515
1516 if (!(o->flags & WANTED)) {
1517 o->flags |= WANTED;
1518 add_object_array(o, NULL, want_obj);
1519 }
1520
1521 return 1;
1522 }
1523
1524 return 0;
1525 }
1526
1527 static int parse_want_ref(struct packet_writer *writer, const char *line,
1528 struct strmap *wanted_refs,
1529 struct strvec *hidden_refs,
1530 struct object_array *want_obj)
1531 {
1532 const char *refname_nons;
1533 if (skip_prefix(line, "want-ref ", &refname_nons)) {
1534 struct object_id oid;
1535 struct object *o = NULL;
1536 struct strbuf refname = STRBUF_INIT;
1537
1538 strbuf_addf(&refname, "%s%s", get_git_namespace(), refname_nons);
1539 if (ref_is_hidden(refname_nons, refname.buf, hidden_refs) ||
1540 refs_read_ref(get_main_ref_store(the_repository), refname.buf, &oid)) {
1541 packet_writer_error(writer, "unknown ref %s", refname_nons);
1542 die("unknown ref %s", refname_nons);
1543 }
1544 strbuf_release(&refname);
1545
1546 if (strmap_put(wanted_refs, refname_nons, oiddup(&oid))) {
1547 packet_writer_error(writer, "duplicate want-ref %s",
1548 refname_nons);
1549 die("duplicate want-ref %s", refname_nons);
1550 }
1551
1552 if (!starts_with(refname_nons, "refs/tags/")) {
1553 struct commit *commit = lookup_commit_in_graph(the_repository, &oid);
1554 if (commit)
1555 o = &commit->object;
1556 }
1557
1558 if (!o)
1559 o = parse_object_or_die(the_repository, &oid, refname_nons);
1560
1561 if (!(o->flags & WANTED)) {
1562 o->flags |= WANTED;
1563 add_object_array(o, NULL, want_obj);
1564 }
1565
1566 return 1;
1567 }
1568
1569 return 0;
1570 }
1571
1572 static int parse_have(const char *line, struct upload_pack_data *data)
1573 {
1574 const char *arg;
1575 if (skip_prefix(line, "have ", &arg)) {
1576 struct object_id oid;
1577
1578 got_oid(data, arg, &oid);
1579 data->seen_haves = 1;
1580 return 1;
1581 }
1582
1583 return 0;
1584 }
1585
1586 static void trace2_fetch_info(struct upload_pack_data *data)
1587 {
1588 struct json_writer jw = JSON_WRITER_INIT;
1589
1590 jw_object_begin(&jw, 0);
1591 jw_object_intmax(&jw, "haves", data->have_obj.nr);
1592 jw_object_intmax(&jw, "wants", data->want_obj.nr);
1593 jw_object_intmax(&jw, "want-refs", strmap_get_size(&data->wanted_refs));
1594 jw_object_intmax(&jw, "depth", data->depth);
1595 jw_object_intmax(&jw, "shallows", data->shallows.nr);
1596 jw_object_bool(&jw, "deepen-since", data->deepen_since);
1597 jw_object_intmax(&jw, "deepen-not", oidset_size(&data->deepen_not));
1598 jw_object_bool(&jw, "deepen-relative", data->deepen_relative);
1599 if (data->filter_options.choice)
1600 jw_object_string(&jw, "filter", list_object_filter_config_name(data->filter_options.choice));
1601 else
1602 jw_object_null(&jw, "filter");
1603 jw_end(&jw);
1604
1605 trace2_data_json("upload-pack", the_repository, "fetch-info", &jw);
1606
1607 jw_release(&jw);
1608 }
1609
1610 static void process_args(struct packet_reader *request,
1611 struct upload_pack_data *data)
1612 {
1613 while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1614 const char *arg = request->line;
1615 const char *p;
1616
1617 /* process want */
1618 if (parse_want(&data->writer, arg, &data->want_obj))
1619 continue;
1620 if (data->allow_ref_in_want &&
1621 parse_want_ref(&data->writer, arg, &data->wanted_refs,
1622 &data->hidden_refs, &data->want_obj))
1623 continue;
1624 /* process have line */
1625 if (parse_have(arg, data))
1626 continue;
1627
1628 /* process args like thin-pack */
1629 if (!strcmp(arg, "thin-pack")) {
1630 data->use_thin_pack = 1;
1631 continue;
1632 }
1633 if (!strcmp(arg, "ofs-delta")) {
1634 data->use_ofs_delta = 1;
1635 continue;
1636 }
1637 if (!strcmp(arg, "no-progress")) {
1638 data->no_progress = 1;
1639 continue;
1640 }
1641 if (!strcmp(arg, "include-tag")) {
1642 data->use_include_tag = 1;
1643 continue;
1644 }
1645 if (!strcmp(arg, "done")) {
1646 data->done = 1;
1647 continue;
1648 }
1649 if (!strcmp(arg, "wait-for-done")) {
1650 data->wait_for_done = 1;
1651 continue;
1652 }
1653
1654 /* Shallow related arguments */
1655 if (process_shallow(arg, &data->shallows))
1656 continue;
1657 if (process_deepen(arg, &data->depth))
1658 continue;
1659 if (process_deepen_since(arg, &data->deepen_since,
1660 &data->deepen_rev_list))
1661 continue;
1662 if (process_deepen_not(arg, &data->deepen_not,
1663 &data->deepen_rev_list))
1664 continue;
1665 if (!strcmp(arg, "deepen-relative")) {
1666 data->deepen_relative = 1;
1667 continue;
1668 }
1669
1670 if (data->allow_filter && skip_prefix(arg, "filter ", &p)) {
1671 list_objects_filter_die_if_populated(&data->filter_options);
1672 parse_list_objects_filter(&data->filter_options, p);
1673 die_if_using_banned_filter(data);
1674 continue;
1675 }
1676
1677 if (data->allow_sideband_all &&
1678 !strcmp(arg, "sideband-all")) {
1679 data->writer.use_sideband = 1;
1680 continue;
1681 }
1682
1683 if (data->allow_packfile_uris &&
1684 skip_prefix(arg, "packfile-uris ", &p)) {
1685 if (data->uri_protocols.nr)
1686 send_err_and_die(data,
1687 "multiple packfile-uris lines forbidden");
1688 string_list_split(&data->uri_protocols, p, ',', -1);
1689 continue;
1690 }
1691
1692 /* ignore unknown lines maybe? */
1693 die("unexpected line: '%s'", arg);
1694 }
1695
1696 if (data->uri_protocols.nr && !data->writer.use_sideband)
1697 string_list_clear(&data->uri_protocols, 0);
1698
1699 if (request->status != PACKET_READ_FLUSH)
1700 die(_("expected flush after fetch arguments"));
1701
1702 if (trace2_is_enabled())
1703 trace2_fetch_info(data);
1704 }
1705
1706 static int send_acks(struct upload_pack_data *data, struct object_array *acks)
1707 {
1708 int i;
1709
1710 packet_writer_write(&data->writer, "acknowledgments\n");
1711
1712 /* Send Acks */
1713 if (!acks->nr)
1714 packet_writer_write(&data->writer, "NAK\n");
1715
1716 for (i = 0; i < acks->nr; i++) {
1717 packet_writer_write(&data->writer, "ACK %s\n",
1718 oid_to_hex(&acks->objects[i].item->oid));
1719 }
1720
1721 if (!data->wait_for_done && ok_to_give_up(data)) {
1722 /* Send Ready */
1723 packet_writer_write(&data->writer, "ready\n");
1724 return 1;
1725 }
1726
1727 return 0;
1728 }
1729
1730 static int process_haves_and_send_acks(struct upload_pack_data *data)
1731 {
1732 int ret = 0;
1733
1734 if (data->done) {
1735 ret = 1;
1736 } else if (send_acks(data, &data->have_obj)) {
1737 packet_writer_delim(&data->writer);
1738 ret = 1;
1739 } else {
1740 /* Add Flush */
1741 packet_writer_flush(&data->writer);
1742 ret = 0;
1743 }
1744
1745 return ret;
1746 }
1747
1748 static void send_wanted_ref_info(struct upload_pack_data *data)
1749 {
1750 struct hashmap_iter iter;
1751 const struct strmap_entry *e;
1752
1753 if (strmap_empty(&data->wanted_refs))
1754 return;
1755
1756 packet_writer_write(&data->writer, "wanted-refs\n");
1757
1758 strmap_for_each_entry(&data->wanted_refs, &iter, e) {
1759 packet_writer_write(&data->writer, "%s %s\n",
1760 oid_to_hex(e->value),
1761 e->key);
1762 }
1763
1764 packet_writer_delim(&data->writer);
1765 }
1766
1767 static void send_shallow_info(struct upload_pack_data *data)
1768 {
1769 /* No shallow info needs to be sent */
1770 if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1771 !is_repository_shallow(the_repository))
1772 return;
1773
1774 packet_writer_write(&data->writer, "shallow-info\n");
1775
1776 if (!send_shallow_list(data) &&
1777 is_repository_shallow(the_repository))
1778 deepen(data, INFINITE_DEPTH);
1779
1780 packet_delim(1);
1781 }
1782
1783 enum upload_state {
1784 UPLOAD_PROCESS_ARGS = 0,
1785 UPLOAD_SEND_ACKS,
1786 UPLOAD_SEND_PACK,
1787 UPLOAD_DONE,
1788 };
1789
1790 int upload_pack_v2(struct repository *r, struct packet_reader *request)
1791 {
1792 enum upload_state state = UPLOAD_PROCESS_ARGS;
1793 struct upload_pack_data data;
1794
1795 clear_object_flags(the_repository, ALL_FLAGS);
1796
1797 upload_pack_data_init(&data);
1798 data.use_sideband = LARGE_PACKET_MAX;
1799 get_upload_pack_config(r, &data);
1800
1801 while (state != UPLOAD_DONE) {
1802 switch (state) {
1803 case UPLOAD_PROCESS_ARGS:
1804 process_args(request, &data);
1805
1806 if (!data.want_obj.nr && !data.wait_for_done) {
1807 /*
1808 * Request didn't contain any 'want' lines (and
1809 * the request does not contain
1810 * "wait-for-done", in which it is reasonable
1811 * to just send 'have's without 'want's); guess
1812 * they didn't want anything.
1813 */
1814 state = UPLOAD_DONE;
1815 } else if (data.seen_haves) {
1816 /*
1817 * Request had 'have' lines, so lets ACK them.
1818 */
1819 state = UPLOAD_SEND_ACKS;
1820 } else {
1821 /*
1822 * Request had 'want's but no 'have's so we can
1823 * immediately go to construct and send a pack.
1824 */
1825 state = UPLOAD_SEND_PACK;
1826 }
1827 break;
1828 case UPLOAD_SEND_ACKS:
1829 if (process_haves_and_send_acks(&data))
1830 state = UPLOAD_SEND_PACK;
1831 else
1832 state = UPLOAD_DONE;
1833 break;
1834 case UPLOAD_SEND_PACK:
1835 send_wanted_ref_info(&data);
1836 send_shallow_info(&data);
1837
1838 if (data.uri_protocols.nr) {
1839 create_pack_file(&data, &data.uri_protocols);
1840 } else {
1841 packet_writer_write(&data.writer, "packfile\n");
1842 create_pack_file(&data, NULL);
1843 }
1844 state = UPLOAD_DONE;
1845 break;
1846 case UPLOAD_DONE:
1847 continue;
1848 }
1849 }
1850
1851 upload_pack_data_clear(&data);
1852 return 0;
1853 }
1854
1855 int upload_pack_advertise(struct repository *r,
1856 struct strbuf *value)
1857 {
1858 struct upload_pack_data data;
1859
1860 upload_pack_data_init(&data);
1861 get_upload_pack_config(r, &data);
1862
1863 if (value) {
1864 strbuf_addstr(value, "shallow wait-for-done");
1865
1866 if (data.allow_filter)
1867 strbuf_addstr(value, " filter");
1868
1869 if (data.allow_ref_in_want)
1870 strbuf_addstr(value, " ref-in-want");
1871
1872 if (data.allow_sideband_all)
1873 strbuf_addstr(value, " sideband-all");
1874
1875 if (data.allow_packfile_uris)
1876 strbuf_addstr(value, " packfile-uris");
1877 }
1878
1879 upload_pack_data_clear(&data);
1880
1881 return 1;
1882 }
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