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gpg-interface: avoid buffer overrun in parse_ssh_output()
[git/debian.git] / upload-pack.c
blobc78d55bc674ed2b22b7f4417173242ad4e53bfd0
1 #include "cache.h"
2 #include "config.h"
3 #include "refs.h"
4 #include "pkt-line.h"
5 #include "sideband.h"
6 #include "repository.h"
7 #include "object-store.h"
8 #include "tag.h"
9 #include "object.h"
10 #include "commit.h"
11 #include "diff.h"
12 #include "revision.h"
13 #include "list-objects.h"
14 #include "list-objects-filter.h"
15 #include "list-objects-filter-options.h"
16 #include "run-command.h"
17 #include "connect.h"
18 #include "sigchain.h"
19 #include "version.h"
20 #include "string-list.h"
21 #include "strvec.h"
22 #include "prio-queue.h"
23 #include "protocol.h"
24 #include "quote.h"
25 #include "upload-pack.h"
26 #include "serve.h"
27 #include "commit-graph.h"
28 #include "commit-reach.h"
29 #include "shallow.h"
30
31 /* Remember to update object flag allocation in object.h */
32 #define THEY_HAVE (1u << 11)
33 #define OUR_REF (1u << 12)
34 #define WANTED (1u << 13)
35 #define COMMON_KNOWN (1u << 14)
36
37 #define SHALLOW (1u << 16)
38 #define NOT_SHALLOW (1u << 17)
39 #define CLIENT_SHALLOW (1u << 18)
40 #define HIDDEN_REF (1u << 19)
41
42 #define ALL_FLAGS (THEY_HAVE | OUR_REF | WANTED | COMMON_KNOWN | SHALLOW | \
43 NOT_SHALLOW | CLIENT_SHALLOW | HIDDEN_REF)
44
45 /* Enum for allowed unadvertised object request (UOR) */
46 enum allow_uor {
47 /* Allow specifying sha1 if it is a ref tip. */
48 ALLOW_TIP_SHA1 = 0x01,
49 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
50 ALLOW_REACHABLE_SHA1 = 0x02,
51 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
52 ALLOW_ANY_SHA1 = 0x07
53 };
54
55 /*
56 * Please annotate, and if possible group together, fields used only
57 * for protocol v0 or only for protocol v2.
58 */
59 struct upload_pack_data {
60 struct string_list symref; /* v0 only */
61 struct object_array want_obj;
62 struct object_array have_obj;
63 struct oid_array haves; /* v2 only */
64 struct string_list wanted_refs; /* v2 only */
65
66 struct object_array shallows;
67 struct string_list deepen_not;
68 struct object_array extra_edge_obj;
69 int depth;
70 timestamp_t deepen_since;
71 int deepen_rev_list;
72 int deepen_relative;
73 int keepalive;
74 int shallow_nr;
75 timestamp_t oldest_have;
76
77 unsigned int timeout; /* v0 only */
78 enum {
79 NO_MULTI_ACK = 0,
80 MULTI_ACK = 1,
81 MULTI_ACK_DETAILED = 2
82 } multi_ack; /* v0 only */
83
84 /* 0 for no sideband, otherwise DEFAULT_PACKET_MAX or LARGE_PACKET_MAX */
85 int use_sideband;
86
87 struct string_list uri_protocols;
88 enum allow_uor allow_uor;
89
90 struct list_objects_filter_options filter_options;
91 struct string_list allowed_filters;
92
93 struct packet_writer writer;
94
95 const char *pack_objects_hook;
96
97 unsigned stateless_rpc : 1; /* v0 only */
98 unsigned no_done : 1; /* v0 only */
99 unsigned daemon_mode : 1; /* v0 only */
100 unsigned filter_capability_requested : 1; /* v0 only */
101
102 unsigned use_thin_pack : 1;
103 unsigned use_ofs_delta : 1;
104 unsigned no_progress : 1;
105 unsigned use_include_tag : 1;
106 unsigned wait_for_done : 1;
107 unsigned allow_filter : 1;
108 unsigned allow_filter_fallback : 1;
109 unsigned long tree_filter_max_depth;
110
111 unsigned done : 1; /* v2 only */
112 unsigned allow_ref_in_want : 1; /* v2 only */
113 unsigned allow_sideband_all : 1; /* v2 only */
114 unsigned advertise_sid : 1;
115 };
116
117 static void upload_pack_data_init(struct upload_pack_data *data)
118 {
119 struct string_list symref = STRING_LIST_INIT_DUP;
120 struct string_list wanted_refs = STRING_LIST_INIT_DUP;
121 struct object_array want_obj = OBJECT_ARRAY_INIT;
122 struct object_array have_obj = OBJECT_ARRAY_INIT;
123 struct oid_array haves = OID_ARRAY_INIT;
124 struct object_array shallows = OBJECT_ARRAY_INIT;
125 struct string_list deepen_not = STRING_LIST_INIT_DUP;
126 struct string_list uri_protocols = STRING_LIST_INIT_DUP;
127 struct object_array extra_edge_obj = OBJECT_ARRAY_INIT;
128 struct string_list allowed_filters = STRING_LIST_INIT_DUP;
129
130 memset(data, 0, sizeof(*data));
131 data->symref = symref;
132 data->wanted_refs = wanted_refs;
133 data->want_obj = want_obj;
134 data->have_obj = have_obj;
135 data->haves = haves;
136 data->shallows = shallows;
137 data->deepen_not = deepen_not;
138 data->uri_protocols = uri_protocols;
139 data->extra_edge_obj = extra_edge_obj;
140 data->allowed_filters = allowed_filters;
141 data->allow_filter_fallback = 1;
142 data->tree_filter_max_depth = ULONG_MAX;
143 packet_writer_init(&data->writer, 1);
144
145 data->keepalive = 5;
146 data->advertise_sid = 0;
147 }
148
149 static void upload_pack_data_clear(struct upload_pack_data *data)
150 {
151 string_list_clear(&data->symref, 1);
152 string_list_clear(&data->wanted_refs, 1);
153 object_array_clear(&data->want_obj);
154 object_array_clear(&data->have_obj);
155 oid_array_clear(&data->haves);
156 object_array_clear(&data->shallows);
157 string_list_clear(&data->deepen_not, 0);
158 object_array_clear(&data->extra_edge_obj);
159 list_objects_filter_release(&data->filter_options);
160 string_list_clear(&data->allowed_filters, 0);
161
162 free((char *)data->pack_objects_hook);
163 }
164
165 static void reset_timeout(unsigned int timeout)
166 {
167 alarm(timeout);
168 }
169
170 static void send_client_data(int fd, const char *data, ssize_t sz,
171 int use_sideband)
172 {
173 if (use_sideband) {
174 send_sideband(1, fd, data, sz, use_sideband);
175 return;
176 }
177 if (fd == 3)
178 /* emergency quit */
179 fd = 2;
180 if (fd == 2) {
181 /* XXX: are we happy to lose stuff here? */
182 xwrite(fd, data, sz);
183 return;
184 }
185 write_or_die(fd, data, sz);
186 }
187
188 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
189 {
190 FILE *fp = cb_data;
191 if (graft->nr_parent == -1)
192 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
193 return 0;
194 }
195
196 struct output_state {
197 char buffer[8193];
198 int used;
199 unsigned packfile_uris_started : 1;
200 unsigned packfile_started : 1;
201 };
202
203 static int relay_pack_data(int pack_objects_out, struct output_state *os,
204 int use_sideband, int write_packfile_line)
205 {
206 /*
207 * We keep the last byte to ourselves
208 * in case we detect broken rev-list, so that we
209 * can leave the stream corrupted. This is
210 * unfortunate -- unpack-objects would happily
211 * accept a valid packdata with trailing garbage,
212 * so appending garbage after we pass all the
213 * pack data is not good enough to signal
214 * breakage to downstream.
215 */
216 ssize_t readsz;
217
218 readsz = xread(pack_objects_out, os->buffer + os->used,
219 sizeof(os->buffer) - os->used);
220 if (readsz < 0) {
221 return readsz;
222 }
223 os->used += readsz;
224
225 while (!os->packfile_started) {
226 char *p;
227 if (os->used >= 4 && !memcmp(os->buffer, "PACK", 4)) {
228 os->packfile_started = 1;
229 if (write_packfile_line) {
230 if (os->packfile_uris_started)
231 packet_delim(1);
232 packet_write_fmt(1, "\1packfile\n");
233 }
234 break;
235 }
236 if ((p = memchr(os->buffer, '\n', os->used))) {
237 if (!os->packfile_uris_started) {
238 os->packfile_uris_started = 1;
239 if (!write_packfile_line)
240 BUG("packfile_uris requires sideband-all");
241 packet_write_fmt(1, "\1packfile-uris\n");
242 }
243 *p = '\0';
244 packet_write_fmt(1, "\1%s\n", os->buffer);
245
246 os->used -= p - os->buffer + 1;
247 memmove(os->buffer, p + 1, os->used);
248 } else {
249 /*
250 * Incomplete line.
251 */
252 return readsz;
253 }
254 }
255
256 if (os->used > 1) {
257 send_client_data(1, os->buffer, os->used - 1, use_sideband);
258 os->buffer[0] = os->buffer[os->used - 1];
259 os->used = 1;
260 } else {
261 send_client_data(1, os->buffer, os->used, use_sideband);
262 os->used = 0;
263 }
264
265 return readsz;
266 }
267
268 static void create_pack_file(struct upload_pack_data *pack_data,
269 const struct string_list *uri_protocols)
270 {
271 struct child_process pack_objects = CHILD_PROCESS_INIT;
272 struct output_state output_state = { { 0 } };
273 char progress[128];
274 char abort_msg[] = "aborting due to possible repository "
275 "corruption on the remote side.";
276 ssize_t sz;
277 int i;
278 FILE *pipe_fd;
279
280 if (!pack_data->pack_objects_hook)
281 pack_objects.git_cmd = 1;
282 else {
283 strvec_push(&pack_objects.args, pack_data->pack_objects_hook);
284 strvec_push(&pack_objects.args, "git");
285 pack_objects.use_shell = 1;
286 }
287
288 if (pack_data->shallow_nr) {
289 strvec_push(&pack_objects.args, "--shallow-file");
290 strvec_push(&pack_objects.args, "");
291 }
292 strvec_push(&pack_objects.args, "pack-objects");
293 strvec_push(&pack_objects.args, "--revs");
294 if (pack_data->use_thin_pack)
295 strvec_push(&pack_objects.args, "--thin");
296
297 strvec_push(&pack_objects.args, "--stdout");
298 if (pack_data->shallow_nr)
299 strvec_push(&pack_objects.args, "--shallow");
300 if (!pack_data->no_progress)
301 strvec_push(&pack_objects.args, "--progress");
302 if (pack_data->use_ofs_delta)
303 strvec_push(&pack_objects.args, "--delta-base-offset");
304 if (pack_data->use_include_tag)
305 strvec_push(&pack_objects.args, "--include-tag");
306 if (pack_data->filter_options.choice) {
307 const char *spec =
308 expand_list_objects_filter_spec(&pack_data->filter_options);
309 strvec_pushf(&pack_objects.args, "--filter=%s", spec);
310 }
311 if (uri_protocols) {
312 for (i = 0; i < uri_protocols->nr; i++)
313 strvec_pushf(&pack_objects.args, "--uri-protocol=%s",
314 uri_protocols->items[i].string);
315 }
316
317 pack_objects.in = -1;
318 pack_objects.out = -1;
319 pack_objects.err = -1;
320 pack_objects.clean_on_exit = 1;
321
322 if (start_command(&pack_objects))
323 die("git upload-pack: unable to fork git-pack-objects");
324
325 pipe_fd = xfdopen(pack_objects.in, "w");
326
327 if (pack_data->shallow_nr)
328 for_each_commit_graft(write_one_shallow, pipe_fd);
329
330 for (i = 0; i < pack_data->want_obj.nr; i++)
331 fprintf(pipe_fd, "%s\n",
332 oid_to_hex(&pack_data->want_obj.objects[i].item->oid));
333 fprintf(pipe_fd, "--not\n");
334 for (i = 0; i < pack_data->have_obj.nr; i++)
335 fprintf(pipe_fd, "%s\n",
336 oid_to_hex(&pack_data->have_obj.objects[i].item->oid));
337 for (i = 0; i < pack_data->extra_edge_obj.nr; i++)
338 fprintf(pipe_fd, "%s\n",
339 oid_to_hex(&pack_data->extra_edge_obj.objects[i].item->oid));
340 fprintf(pipe_fd, "\n");
341 fflush(pipe_fd);
342 fclose(pipe_fd);
343
344 /* We read from pack_objects.err to capture stderr output for
345 * progress bar, and pack_objects.out to capture the pack data.
346 */
347
348 while (1) {
349 struct pollfd pfd[2];
350 int pe, pu, pollsize, polltimeout;
351 int ret;
352
353 reset_timeout(pack_data->timeout);
354
355 pollsize = 0;
356 pe = pu = -1;
357
358 if (0 <= pack_objects.out) {
359 pfd[pollsize].fd = pack_objects.out;
360 pfd[pollsize].events = POLLIN;
361 pu = pollsize;
362 pollsize++;
363 }
364 if (0 <= pack_objects.err) {
365 pfd[pollsize].fd = pack_objects.err;
366 pfd[pollsize].events = POLLIN;
367 pe = pollsize;
368 pollsize++;
369 }
370
371 if (!pollsize)
372 break;
373
374 polltimeout = pack_data->keepalive < 0
375 ? -1
376 : 1000 * pack_data->keepalive;
377
378 ret = poll(pfd, pollsize, polltimeout);
379
380 if (ret < 0) {
381 if (errno != EINTR) {
382 error_errno("poll failed, resuming");
383 sleep(1);
384 }
385 continue;
386 }
387 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
388 /* Status ready; we ship that in the side-band
389 * or dump to the standard error.
390 */
391 sz = xread(pack_objects.err, progress,
392 sizeof(progress));
393 if (0 < sz)
394 send_client_data(2, progress, sz,
395 pack_data->use_sideband);
396 else if (sz == 0) {
397 close(pack_objects.err);
398 pack_objects.err = -1;
399 }
400 else
401 goto fail;
402 /* give priority to status messages */
403 continue;
404 }
405 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
406 int result = relay_pack_data(pack_objects.out,
407 &output_state,
408 pack_data->use_sideband,
409 !!uri_protocols);
410
411 if (result == 0) {
412 close(pack_objects.out);
413 pack_objects.out = -1;
414 } else if (result < 0) {
415 goto fail;
416 }
417 }
418
419 /*
420 * We hit the keepalive timeout without saying anything; send
421 * an empty message on the data sideband just to let the other
422 * side know we're still working on it, but don't have any data
423 * yet.
424 *
425 * If we don't have a sideband channel, there's no room in the
426 * protocol to say anything, so those clients are just out of
427 * luck.
428 */
429 if (!ret && pack_data->use_sideband) {
430 static const char buf[] = "0005\1";
431 write_or_die(1, buf, 5);
432 }
433 }
434
435 if (finish_command(&pack_objects)) {
436 error("git upload-pack: git-pack-objects died with error.");
437 goto fail;
438 }
439
440 /* flush the data */
441 if (output_state.used > 0) {
442 send_client_data(1, output_state.buffer, output_state.used,
443 pack_data->use_sideband);
444 fprintf(stderr, "flushed.\n");
445 }
446 if (pack_data->use_sideband)
447 packet_flush(1);
448 return;
449
450 fail:
451 send_client_data(3, abort_msg, sizeof(abort_msg),
452 pack_data->use_sideband);
453 die("git upload-pack: %s", abort_msg);
454 }
455
456 static int do_got_oid(struct upload_pack_data *data, const struct object_id *oid)
457 {
458 int we_knew_they_have = 0;
459 struct object *o = parse_object(the_repository, oid);
460
461 if (!o)
462 die("oops (%s)", oid_to_hex(oid));
463 if (o->type == OBJ_COMMIT) {
464 struct commit_list *parents;
465 struct commit *commit = (struct commit *)o;
466 if (o->flags & THEY_HAVE)
467 we_knew_they_have = 1;
468 else
469 o->flags |= THEY_HAVE;
470 if (!data->oldest_have || (commit->date < data->oldest_have))
471 data->oldest_have = commit->date;
472 for (parents = commit->parents;
473 parents;
474 parents = parents->next)
475 parents->item->object.flags |= THEY_HAVE;
476 }
477 if (!we_knew_they_have) {
478 add_object_array(o, NULL, &data->have_obj);
479 return 1;
480 }
481 return 0;
482 }
483
484 static int got_oid(struct upload_pack_data *data,
485 const char *hex, struct object_id *oid)
486 {
487 if (get_oid_hex(hex, oid))
488 die("git upload-pack: expected SHA1 object, got '%s'", hex);
489 if (!has_object_file_with_flags(oid,
490 OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
491 return -1;
492 return do_got_oid(data, oid);
493 }
494
495 static int ok_to_give_up(struct upload_pack_data *data)
496 {
497 timestamp_t min_generation = GENERATION_NUMBER_ZERO;
498
499 if (!data->have_obj.nr)
500 return 0;
501
502 return can_all_from_reach_with_flag(&data->want_obj, THEY_HAVE,
503 COMMON_KNOWN, data->oldest_have,
504 min_generation);
505 }
506
507 static int get_common_commits(struct upload_pack_data *data,
508 struct packet_reader *reader)
509 {
510 struct object_id oid;
511 char last_hex[GIT_MAX_HEXSZ + 1];
512 int got_common = 0;
513 int got_other = 0;
514 int sent_ready = 0;
515
516 save_commit_buffer = 0;
517
518 for (;;) {
519 const char *arg;
520
521 reset_timeout(data->timeout);
522
523 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
524 if (data->multi_ack == MULTI_ACK_DETAILED
525 && got_common
526 && !got_other
527 && ok_to_give_up(data)) {
528 sent_ready = 1;
529 packet_write_fmt(1, "ACK %s ready\n", last_hex);
530 }
531 if (data->have_obj.nr == 0 || data->multi_ack)
532 packet_write_fmt(1, "NAK\n");
533
534 if (data->no_done && sent_ready) {
535 packet_write_fmt(1, "ACK %s\n", last_hex);
536 return 0;
537 }
538 if (data->stateless_rpc)
539 exit(0);
540 got_common = 0;
541 got_other = 0;
542 continue;
543 }
544 if (skip_prefix(reader->line, "have ", &arg)) {
545 switch (got_oid(data, arg, &oid)) {
546 case -1: /* they have what we do not */
547 got_other = 1;
548 if (data->multi_ack
549 && ok_to_give_up(data)) {
550 const char *hex = oid_to_hex(&oid);
551 if (data->multi_ack == MULTI_ACK_DETAILED) {
552 sent_ready = 1;
553 packet_write_fmt(1, "ACK %s ready\n", hex);
554 } else
555 packet_write_fmt(1, "ACK %s continue\n", hex);
556 }
557 break;
558 default:
559 got_common = 1;
560 oid_to_hex_r(last_hex, &oid);
561 if (data->multi_ack == MULTI_ACK_DETAILED)
562 packet_write_fmt(1, "ACK %s common\n", last_hex);
563 else if (data->multi_ack)
564 packet_write_fmt(1, "ACK %s continue\n", last_hex);
565 else if (data->have_obj.nr == 1)
566 packet_write_fmt(1, "ACK %s\n", last_hex);
567 break;
568 }
569 continue;
570 }
571 if (!strcmp(reader->line, "done")) {
572 if (data->have_obj.nr > 0) {
573 if (data->multi_ack)
574 packet_write_fmt(1, "ACK %s\n", last_hex);
575 return 0;
576 }
577 packet_write_fmt(1, "NAK\n");
578 return -1;
579 }
580 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
581 }
582 }
583
584 static int is_our_ref(struct object *o, enum allow_uor allow_uor)
585 {
586 int allow_hidden_ref = (allow_uor &
587 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
588 return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
589 }
590
591 /*
592 * on successful case, it's up to the caller to close cmd->out
593 */
594 static int do_reachable_revlist(struct child_process *cmd,
595 struct object_array *src,
596 struct object_array *reachable,
597 enum allow_uor allow_uor)
598 {
599 static const char *argv[] = {
600 "rev-list", "--stdin", NULL,
601 };
602 struct object *o;
603 FILE *cmd_in = NULL;
604 int i;
605
606 cmd->argv = argv;
607 cmd->git_cmd = 1;
608 cmd->no_stderr = 1;
609 cmd->in = -1;
610 cmd->out = -1;
611
612 /*
613 * If the next rev-list --stdin encounters an unknown commit,
614 * it terminates, which will cause SIGPIPE in the write loop
615 * below.
616 */
617 sigchain_push(SIGPIPE, SIG_IGN);
618
619 if (start_command(cmd))
620 goto error;
621
622 cmd_in = xfdopen(cmd->in, "w");
623
624 for (i = get_max_object_index(); 0 < i; ) {
625 o = get_indexed_object(--i);
626 if (!o)
627 continue;
628 if (reachable && o->type == OBJ_COMMIT)
629 o->flags &= ~TMP_MARK;
630 if (!is_our_ref(o, allow_uor))
631 continue;
632 if (fprintf(cmd_in, "^%s\n", oid_to_hex(&o->oid)) < 0)
633 goto error;
634 }
635 for (i = 0; i < src->nr; i++) {
636 o = src->objects[i].item;
637 if (is_our_ref(o, allow_uor)) {
638 if (reachable)
639 add_object_array(o, NULL, reachable);
640 continue;
641 }
642 if (reachable && o->type == OBJ_COMMIT)
643 o->flags |= TMP_MARK;
644 if (fprintf(cmd_in, "%s\n", oid_to_hex(&o->oid)) < 0)
645 goto error;
646 }
647 if (ferror(cmd_in) || fflush(cmd_in))
648 goto error;
649 fclose(cmd_in);
650 cmd->in = -1;
651 sigchain_pop(SIGPIPE);
652
653 return 0;
654
655 error:
656 sigchain_pop(SIGPIPE);
657
658 if (cmd_in)
659 fclose(cmd_in);
660 if (cmd->out >= 0)
661 close(cmd->out);
662 return -1;
663 }
664
665 static int get_reachable_list(struct upload_pack_data *data,
666 struct object_array *reachable)
667 {
668 struct child_process cmd = CHILD_PROCESS_INIT;
669 int i;
670 struct object *o;
671 char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
672 const unsigned hexsz = the_hash_algo->hexsz;
673
674 if (do_reachable_revlist(&cmd, &data->shallows, reachable,
675 data->allow_uor) < 0)
676 return -1;
677
678 while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
679 struct object_id oid;
680 const char *p;
681
682 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
683 break;
684
685 o = lookup_object(the_repository, &oid);
686 if (o && o->type == OBJ_COMMIT) {
687 o->flags &= ~TMP_MARK;
688 }
689 }
690 for (i = get_max_object_index(); 0 < i; i--) {
691 o = get_indexed_object(i - 1);
692 if (o && o->type == OBJ_COMMIT &&
693 (o->flags & TMP_MARK)) {
694 add_object_array(o, NULL, reachable);
695 o->flags &= ~TMP_MARK;
696 }
697 }
698 close(cmd.out);
699
700 if (finish_command(&cmd))
701 return -1;
702
703 return 0;
704 }
705
706 static int has_unreachable(struct object_array *src, enum allow_uor allow_uor)
707 {
708 struct child_process cmd = CHILD_PROCESS_INIT;
709 char buf[1];
710 int i;
711
712 if (do_reachable_revlist(&cmd, src, NULL, allow_uor) < 0)
713 return 1;
714
715 /*
716 * The commits out of the rev-list are not ancestors of
717 * our ref.
718 */
719 i = read_in_full(cmd.out, buf, 1);
720 if (i)
721 goto error;
722 close(cmd.out);
723 cmd.out = -1;
724
725 /*
726 * rev-list may have died by encountering a bad commit
727 * in the history, in which case we do want to bail out
728 * even when it showed no commit.
729 */
730 if (finish_command(&cmd))
731 goto error;
732
733 /* All the non-tip ones are ancestors of what we advertised */
734 return 0;
735
736 error:
737 if (cmd.out >= 0)
738 close(cmd.out);
739 return 1;
740 }
741
742 static void check_non_tip(struct upload_pack_data *data)
743 {
744 int i;
745
746 /*
747 * In the normal in-process case without
748 * uploadpack.allowReachableSHA1InWant,
749 * non-tip requests can never happen.
750 */
751 if (!data->stateless_rpc && !(data->allow_uor & ALLOW_REACHABLE_SHA1))
752 goto error;
753 if (!has_unreachable(&data->want_obj, data->allow_uor))
754 /* All the non-tip ones are ancestors of what we advertised */
755 return;
756
757 error:
758 /* Pick one of them (we know there at least is one) */
759 for (i = 0; i < data->want_obj.nr; i++) {
760 struct object *o = data->want_obj.objects[i].item;
761 if (!is_our_ref(o, data->allow_uor)) {
762 packet_writer_error(&data->writer,
763 "upload-pack: not our ref %s",
764 oid_to_hex(&o->oid));
765 die("git upload-pack: not our ref %s",
766 oid_to_hex(&o->oid));
767 }
768 }
769 }
770
771 static void send_shallow(struct upload_pack_data *data,
772 struct commit_list *result)
773 {
774 while (result) {
775 struct object *object = &result->item->object;
776 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
777 packet_writer_write(&data->writer, "shallow %s",
778 oid_to_hex(&object->oid));
779 register_shallow(the_repository, &object->oid);
780 data->shallow_nr++;
781 }
782 result = result->next;
783 }
784 }
785
786 static void send_unshallow(struct upload_pack_data *data)
787 {
788 int i;
789
790 for (i = 0; i < data->shallows.nr; i++) {
791 struct object *object = data->shallows.objects[i].item;
792 if (object->flags & NOT_SHALLOW) {
793 struct commit_list *parents;
794 packet_writer_write(&data->writer, "unshallow %s",
795 oid_to_hex(&object->oid));
796 object->flags &= ~CLIENT_SHALLOW;
797 /*
798 * We want to _register_ "object" as shallow, but we
799 * also need to traverse object's parents to deepen a
800 * shallow clone. Unregister it for now so we can
801 * parse and add the parents to the want list, then
802 * re-register it.
803 */
804 unregister_shallow(&object->oid);
805 object->parsed = 0;
806 parse_commit_or_die((struct commit *)object);
807 parents = ((struct commit *)object)->parents;
808 while (parents) {
809 add_object_array(&parents->item->object,
810 NULL, &data->want_obj);
811 parents = parents->next;
812 }
813 add_object_array(object, NULL, &data->extra_edge_obj);
814 }
815 /* make sure commit traversal conforms to client */
816 register_shallow(the_repository, &object->oid);
817 }
818 }
819
820 static int check_ref(const char *refname_full, const struct object_id *oid,
821 int flag, void *cb_data);
822 static void deepen(struct upload_pack_data *data, int depth)
823 {
824 if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
825 int i;
826
827 for (i = 0; i < data->shallows.nr; i++) {
828 struct object *object = data->shallows.objects[i].item;
829 object->flags |= NOT_SHALLOW;
830 }
831 } else if (data->deepen_relative) {
832 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
833 struct commit_list *result;
834
835 /*
836 * Checking for reachable shallows requires that our refs be
837 * marked with OUR_REF.
838 */
839 head_ref_namespaced(check_ref, NULL);
840 for_each_namespaced_ref(check_ref, NULL);
841
842 get_reachable_list(data, &reachable_shallows);
843 result = get_shallow_commits(&reachable_shallows,
844 depth + 1,
845 SHALLOW, NOT_SHALLOW);
846 send_shallow(data, result);
847 free_commit_list(result);
848 object_array_clear(&reachable_shallows);
849 } else {
850 struct commit_list *result;
851
852 result = get_shallow_commits(&data->want_obj, depth,
853 SHALLOW, NOT_SHALLOW);
854 send_shallow(data, result);
855 free_commit_list(result);
856 }
857
858 send_unshallow(data);
859 }
860
861 static void deepen_by_rev_list(struct upload_pack_data *data,
862 int ac,
863 const char **av)
864 {
865 struct commit_list *result;
866
867 disable_commit_graph(the_repository);
868 result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
869 send_shallow(data, result);
870 free_commit_list(result);
871 send_unshallow(data);
872 }
873
874 /* Returns 1 if a shallow list is sent or 0 otherwise */
875 static int send_shallow_list(struct upload_pack_data *data)
876 {
877 int ret = 0;
878
879 if (data->depth > 0 && data->deepen_rev_list)
880 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
881 if (data->depth > 0) {
882 deepen(data, data->depth);
883 ret = 1;
884 } else if (data->deepen_rev_list) {
885 struct strvec av = STRVEC_INIT;
886 int i;
887
888 strvec_push(&av, "rev-list");
889 if (data->deepen_since)
890 strvec_pushf(&av, "--max-age=%"PRItime, data->deepen_since);
891 if (data->deepen_not.nr) {
892 strvec_push(&av, "--not");
893 for (i = 0; i < data->deepen_not.nr; i++) {
894 struct string_list_item *s = data->deepen_not.items + i;
895 strvec_push(&av, s->string);
896 }
897 strvec_push(&av, "--not");
898 }
899 for (i = 0; i < data->want_obj.nr; i++) {
900 struct object *o = data->want_obj.objects[i].item;
901 strvec_push(&av, oid_to_hex(&o->oid));
902 }
903 deepen_by_rev_list(data, av.nr, av.v);
904 strvec_clear(&av);
905 ret = 1;
906 } else {
907 if (data->shallows.nr > 0) {
908 int i;
909 for (i = 0; i < data->shallows.nr; i++)
910 register_shallow(the_repository,
911 &data->shallows.objects[i].item->oid);
912 }
913 }
914
915 data->shallow_nr += data->shallows.nr;
916 return ret;
917 }
918
919 static int process_shallow(const char *line, struct object_array *shallows)
920 {
921 const char *arg;
922 if (skip_prefix(line, "shallow ", &arg)) {
923 struct object_id oid;
924 struct object *object;
925 if (get_oid_hex(arg, &oid))
926 die("invalid shallow line: %s", line);
927 object = parse_object(the_repository, &oid);
928 if (!object)
929 return 1;
930 if (object->type != OBJ_COMMIT)
931 die("invalid shallow object %s", oid_to_hex(&oid));
932 if (!(object->flags & CLIENT_SHALLOW)) {
933 object->flags |= CLIENT_SHALLOW;
934 add_object_array(object, NULL, shallows);
935 }
936 return 1;
937 }
938
939 return 0;
940 }
941
942 static int process_deepen(const char *line, int *depth)
943 {
944 const char *arg;
945 if (skip_prefix(line, "deepen ", &arg)) {
946 char *end = NULL;
947 *depth = (int)strtol(arg, &end, 0);
948 if (!end || *end || *depth <= 0)
949 die("Invalid deepen: %s", line);
950 return 1;
951 }
952
953 return 0;
954 }
955
956 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
957 {
958 const char *arg;
959 if (skip_prefix(line, "deepen-since ", &arg)) {
960 char *end = NULL;
961 *deepen_since = parse_timestamp(arg, &end, 0);
962 if (!end || *end || !deepen_since ||
963 /* revisions.c's max_age -1 is special */
964 *deepen_since == -1)
965 die("Invalid deepen-since: %s", line);
966 *deepen_rev_list = 1;
967 return 1;
968 }
969 return 0;
970 }
971
972 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
973 {
974 const char *arg;
975 if (skip_prefix(line, "deepen-not ", &arg)) {
976 char *ref = NULL;
977 struct object_id oid;
978 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
979 die("git upload-pack: ambiguous deepen-not: %s", line);
980 string_list_append(deepen_not, ref);
981 free(ref);
982 *deepen_rev_list = 1;
983 return 1;
984 }
985 return 0;
986 }
987
988 NORETURN __attribute__((format(printf,2,3)))
989 static void send_err_and_die(struct upload_pack_data *data,
990 const char *fmt, ...)
991 {
992 struct strbuf buf = STRBUF_INIT;
993 va_list ap;
994
995 va_start(ap, fmt);
996 strbuf_vaddf(&buf, fmt, ap);
997 va_end(ap);
998
999 packet_writer_error(&data->writer, "%s", buf.buf);
1000 die("%s", buf.buf);
1001 }
1002
1003 static void check_one_filter(struct upload_pack_data *data,
1004 struct list_objects_filter_options *opts)
1005 {
1006 const char *key = list_object_filter_config_name(opts->choice);
1007 struct string_list_item *item = string_list_lookup(&data->allowed_filters,
1008 key);
1009 int allowed;
1010
1011 if (item)
1012 allowed = (intptr_t)item->util;
1013 else
1014 allowed = data->allow_filter_fallback;
1015
1016 if (!allowed)
1017 send_err_and_die(data, "filter '%s' not supported", key);
1018
1019 if (opts->choice == LOFC_TREE_DEPTH &&
1020 opts->tree_exclude_depth > data->tree_filter_max_depth)
1021 send_err_and_die(data,
1022 "tree filter allows max depth %lu, but got %lu",
1023 data->tree_filter_max_depth,
1024 opts->tree_exclude_depth);
1025 }
1026
1027 static void check_filter_recurse(struct upload_pack_data *data,
1028 struct list_objects_filter_options *opts)
1029 {
1030 size_t i;
1031
1032 check_one_filter(data, opts);
1033 if (opts->choice != LOFC_COMBINE)
1034 return;
1035
1036 for (i = 0; i < opts->sub_nr; i++)
1037 check_filter_recurse(data, &opts->sub[i]);
1038 }
1039
1040 static void die_if_using_banned_filter(struct upload_pack_data *data)
1041 {
1042 check_filter_recurse(data, &data->filter_options);
1043 }
1044
1045 static void receive_needs(struct upload_pack_data *data,
1046 struct packet_reader *reader)
1047 {
1048 int has_non_tip = 0;
1049
1050 data->shallow_nr = 0;
1051 for (;;) {
1052 struct object *o;
1053 const char *features;
1054 struct object_id oid_buf;
1055 const char *arg;
1056 int feature_len;
1057
1058 reset_timeout(data->timeout);
1059 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
1060 break;
1061
1062 if (process_shallow(reader->line, &data->shallows))
1063 continue;
1064 if (process_deepen(reader->line, &data->depth))
1065 continue;
1066 if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
1067 continue;
1068 if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
1069 continue;
1070
1071 if (skip_prefix(reader->line, "filter ", &arg)) {
1072 if (!data->filter_capability_requested)
1073 die("git upload-pack: filtering capability not negotiated");
1074 list_objects_filter_die_if_populated(&data->filter_options);
1075 parse_list_objects_filter(&data->filter_options, arg);
1076 die_if_using_banned_filter(data);
1077 continue;
1078 }
1079
1080 if (!skip_prefix(reader->line, "want ", &arg) ||
1081 parse_oid_hex(arg, &oid_buf, &features))
1082 die("git upload-pack: protocol error, "
1083 "expected to get object ID, not '%s'", reader->line);
1084
1085 if (parse_feature_request(features, "deepen-relative"))
1086 data->deepen_relative = 1;
1087 if (parse_feature_request(features, "multi_ack_detailed"))
1088 data->multi_ack = MULTI_ACK_DETAILED;
1089 else if (parse_feature_request(features, "multi_ack"))
1090 data->multi_ack = MULTI_ACK;
1091 if (parse_feature_request(features, "no-done"))
1092 data->no_done = 1;
1093 if (parse_feature_request(features, "thin-pack"))
1094 data->use_thin_pack = 1;
1095 if (parse_feature_request(features, "ofs-delta"))
1096 data->use_ofs_delta = 1;
1097 if (parse_feature_request(features, "side-band-64k"))
1098 data->use_sideband = LARGE_PACKET_MAX;
1099 else if (parse_feature_request(features, "side-band"))
1100 data->use_sideband = DEFAULT_PACKET_MAX;
1101 if (parse_feature_request(features, "no-progress"))
1102 data->no_progress = 1;
1103 if (parse_feature_request(features, "include-tag"))
1104 data->use_include_tag = 1;
1105 if (data->allow_filter &&
1106 parse_feature_request(features, "filter"))
1107 data->filter_capability_requested = 1;
1108
1109 arg = parse_feature_value(features, "session-id", &feature_len, NULL);
1110 if (arg) {
1111 char *client_sid = xstrndup(arg, feature_len);
1112 trace2_data_string("transfer", NULL, "client-sid", client_sid);
1113 free(client_sid);
1114 }
1115
1116 o = parse_object(the_repository, &oid_buf);
1117 if (!o) {
1118 packet_writer_error(&data->writer,
1119 "upload-pack: not our ref %s",
1120 oid_to_hex(&oid_buf));
1121 die("git upload-pack: not our ref %s",
1122 oid_to_hex(&oid_buf));
1123 }
1124 if (!(o->flags & WANTED)) {
1125 o->flags |= WANTED;
1126 if (!((data->allow_uor & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
1127 || is_our_ref(o, data->allow_uor)))
1128 has_non_tip = 1;
1129 add_object_array(o, NULL, &data->want_obj);
1130 }
1131 }
1132
1133 /*
1134 * We have sent all our refs already, and the other end
1135 * should have chosen out of them. When we are operating
1136 * in the stateless RPC mode, however, their choice may
1137 * have been based on the set of older refs advertised
1138 * by another process that handled the initial request.
1139 */
1140 if (has_non_tip)
1141 check_non_tip(data);
1142
1143 if (!data->use_sideband && data->daemon_mode)
1144 data->no_progress = 1;
1145
1146 if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1147 return;
1148
1149 if (send_shallow_list(data))
1150 packet_flush(1);
1151 }
1152
1153 /* return non-zero if the ref is hidden, otherwise 0 */
1154 static int mark_our_ref(const char *refname, const char *refname_full,
1155 const struct object_id *oid)
1156 {
1157 struct object *o = lookup_unknown_object(the_repository, oid);
1158
1159 if (ref_is_hidden(refname, refname_full)) {
1160 o->flags |= HIDDEN_REF;
1161 return 1;
1162 }
1163 o->flags |= OUR_REF;
1164 return 0;
1165 }
1166
1167 static int check_ref(const char *refname_full, const struct object_id *oid,
1168 int flag, void *cb_data)
1169 {
1170 const char *refname = strip_namespace(refname_full);
1171
1172 mark_our_ref(refname, refname_full, oid);
1173 return 0;
1174 }
1175
1176 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1177 {
1178 struct string_list_item *item;
1179
1180 if (!symref->nr)
1181 return;
1182 for_each_string_list_item(item, symref)
1183 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1184 }
1185
1186 static void format_session_id(struct strbuf *buf, struct upload_pack_data *d) {
1187 if (d->advertise_sid)
1188 strbuf_addf(buf, " session-id=%s", trace2_session_id());
1189 }
1190
1191 static int send_ref(const char *refname, const struct object_id *oid,
1192 int flag, void *cb_data)
1193 {
1194 static const char *capabilities = "multi_ack thin-pack side-band"
1195 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1196 " deepen-relative no-progress include-tag multi_ack_detailed";
1197 const char *refname_nons = strip_namespace(refname);
1198 struct object_id peeled;
1199 struct upload_pack_data *data = cb_data;
1200
1201 if (mark_our_ref(refname_nons, refname, oid))
1202 return 0;
1203
1204 if (capabilities) {
1205 struct strbuf symref_info = STRBUF_INIT;
1206 struct strbuf session_id = STRBUF_INIT;
1207
1208 format_symref_info(&symref_info, &data->symref);
1209 format_session_id(&session_id, data);
1210 packet_fwrite_fmt(stdout, "%s %s%c%s%s%s%s%s%s%s object-format=%s agent=%s\n",
1211 oid_to_hex(oid), refname_nons,
1212 0, capabilities,
1213 (data->allow_uor & ALLOW_TIP_SHA1) ?
1214 " allow-tip-sha1-in-want" : "",
1215 (data->allow_uor & ALLOW_REACHABLE_SHA1) ?
1216 " allow-reachable-sha1-in-want" : "",
1217 data->no_done ? " no-done" : "",
1218 symref_info.buf,
1219 data->allow_filter ? " filter" : "",
1220 session_id.buf,
1221 the_hash_algo->name,
1222 git_user_agent_sanitized());
1223 strbuf_release(&symref_info);
1224 strbuf_release(&session_id);
1225 } else {
1226 packet_fwrite_fmt(stdout, "%s %s\n", oid_to_hex(oid), refname_nons);
1227 }
1228 capabilities = NULL;
1229 if (!peel_iterated_oid(oid, &peeled))
1230 packet_fwrite_fmt(stdout, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1231 return 0;
1232 }
1233
1234 static int find_symref(const char *refname, const struct object_id *oid,
1235 int flag, void *cb_data)
1236 {
1237 const char *symref_target;
1238 struct string_list_item *item;
1239
1240 if ((flag & REF_ISSYMREF) == 0)
1241 return 0;
1242 symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1243 if (!symref_target || (flag & REF_ISSYMREF) == 0)
1244 die("'%s' is a symref but it is not?", refname);
1245 item = string_list_append(cb_data, strip_namespace(refname));
1246 item->util = xstrdup(strip_namespace(symref_target));
1247 return 0;
1248 }
1249
1250 static int parse_object_filter_config(const char *var, const char *value,
1251 struct upload_pack_data *data)
1252 {
1253 struct strbuf buf = STRBUF_INIT;
1254 const char *sub, *key;
1255 size_t sub_len;
1256
1257 if (parse_config_key(var, "uploadpackfilter", &sub, &sub_len, &key))
1258 return 0;
1259
1260 if (!sub) {
1261 if (!strcmp(key, "allow"))
1262 data->allow_filter_fallback = git_config_bool(var, value);
1263 return 0;
1264 }
1265
1266 strbuf_add(&buf, sub, sub_len);
1267
1268 if (!strcmp(key, "allow"))
1269 string_list_insert(&data->allowed_filters, buf.buf)->util =
1270 (void *)(intptr_t)git_config_bool(var, value);
1271 else if (!strcmp(buf.buf, "tree") && !strcmp(key, "maxdepth")) {
1272 if (!value) {
1273 strbuf_release(&buf);
1274 return config_error_nonbool(var);
1275 }
1276 string_list_insert(&data->allowed_filters, buf.buf)->util =
1277 (void *)(intptr_t)1;
1278 data->tree_filter_max_depth = git_config_ulong(var, value);
1279 }
1280
1281 strbuf_release(&buf);
1282 return 0;
1283 }
1284
1285 static int upload_pack_config(const char *var, const char *value, void *cb_data)
1286 {
1287 struct upload_pack_data *data = cb_data;
1288
1289 if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1290 if (git_config_bool(var, value))
1291 data->allow_uor |= ALLOW_TIP_SHA1;
1292 else
1293 data->allow_uor &= ~ALLOW_TIP_SHA1;
1294 } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1295 if (git_config_bool(var, value))
1296 data->allow_uor |= ALLOW_REACHABLE_SHA1;
1297 else
1298 data->allow_uor &= ~ALLOW_REACHABLE_SHA1;
1299 } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1300 if (git_config_bool(var, value))
1301 data->allow_uor |= ALLOW_ANY_SHA1;
1302 else
1303 data->allow_uor &= ~ALLOW_ANY_SHA1;
1304 } else if (!strcmp("uploadpack.keepalive", var)) {
1305 data->keepalive = git_config_int(var, value);
1306 if (!data->keepalive)
1307 data->keepalive = -1;
1308 } else if (!strcmp("uploadpack.allowfilter", var)) {
1309 data->allow_filter = git_config_bool(var, value);
1310 } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1311 data->allow_ref_in_want = git_config_bool(var, value);
1312 } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1313 data->allow_sideband_all = git_config_bool(var, value);
1314 } else if (!strcmp("core.precomposeunicode", var)) {
1315 precomposed_unicode = git_config_bool(var, value);
1316 } else if (!strcmp("transfer.advertisesid", var)) {
1317 data->advertise_sid = git_config_bool(var, value);
1318 }
1319
1320 if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
1321 current_config_scope() != CONFIG_SCOPE_WORKTREE) {
1322 if (!strcmp("uploadpack.packobjectshook", var))
1323 return git_config_string(&data->pack_objects_hook, var, value);
1324 }
1325
1326 if (parse_object_filter_config(var, value, data) < 0)
1327 return -1;
1328
1329 return parse_hide_refs_config(var, value, "uploadpack");
1330 }
1331
1332 void upload_pack(const int advertise_refs, const int stateless_rpc,
1333 const int timeout)
1334 {
1335 struct packet_reader reader;
1336 struct upload_pack_data data;
1337
1338 upload_pack_data_init(&data);
1339
1340 git_config(upload_pack_config, &data);
1341
1342 data.stateless_rpc = stateless_rpc;
1343 data.timeout = timeout;
1344 if (data.timeout)
1345 data.daemon_mode = 1;
1346
1347 head_ref_namespaced(find_symref, &data.symref);
1348
1349 if (advertise_refs || !data.stateless_rpc) {
1350 reset_timeout(data.timeout);
1351 if (advertise_refs)
1352 data.no_done = 1;
1353 head_ref_namespaced(send_ref, &data);
1354 for_each_namespaced_ref(send_ref, &data);
1355 /*
1356 * fflush stdout before calling advertise_shallow_grafts because send_ref
1357 * uses stdio.
1358 */
1359 fflush_or_die(stdout);
1360 advertise_shallow_grafts(1);
1361 packet_flush(1);
1362 } else {
1363 head_ref_namespaced(check_ref, NULL);
1364 for_each_namespaced_ref(check_ref, NULL);
1365 }
1366
1367 if (!advertise_refs) {
1368 packet_reader_init(&reader, 0, NULL, 0,
1369 PACKET_READ_CHOMP_NEWLINE |
1370 PACKET_READ_DIE_ON_ERR_PACKET);
1371
1372 receive_needs(&data, &reader);
1373
1374 /*
1375 * An EOF at this exact point in negotiation should be
1376 * acceptable from stateless clients as they will consume the
1377 * shallow list before doing subsequent rpc with haves/etc.
1378 */
1379 if (data.stateless_rpc)
1380 reader.options |= PACKET_READ_GENTLE_ON_EOF;
1381
1382 if (data.want_obj.nr &&
1383 packet_reader_peek(&reader) != PACKET_READ_EOF) {
1384 reader.options &= ~PACKET_READ_GENTLE_ON_EOF;
1385 get_common_commits(&data, &reader);
1386 create_pack_file(&data, NULL);
1387 }
1388 }
1389
1390 upload_pack_data_clear(&data);
1391 }
1392
1393 static int parse_want(struct packet_writer *writer, const char *line,
1394 struct object_array *want_obj)
1395 {
1396 const char *arg;
1397 if (skip_prefix(line, "want ", &arg)) {
1398 struct object_id oid;
1399 struct object *o;
1400
1401 if (get_oid_hex(arg, &oid))
1402 die("git upload-pack: protocol error, "
1403 "expected to get oid, not '%s'", line);
1404
1405 o = parse_object(the_repository, &oid);
1406 if (!o) {
1407 packet_writer_error(writer,
1408 "upload-pack: not our ref %s",
1409 oid_to_hex(&oid));
1410 die("git upload-pack: not our ref %s",
1411 oid_to_hex(&oid));
1412 }
1413
1414 if (!(o->flags & WANTED)) {
1415 o->flags |= WANTED;
1416 add_object_array(o, NULL, want_obj);
1417 }
1418
1419 return 1;
1420 }
1421
1422 return 0;
1423 }
1424
1425 static int parse_want_ref(struct packet_writer *writer, const char *line,
1426 struct string_list *wanted_refs,
1427 struct object_array *want_obj)
1428 {
1429 const char *refname_nons;
1430 if (skip_prefix(line, "want-ref ", &refname_nons)) {
1431 struct object_id oid;
1432 struct string_list_item *item;
1433 struct object *o;
1434 struct strbuf refname = STRBUF_INIT;
1435
1436 strbuf_addf(&refname, "%s%s", get_git_namespace(), refname_nons);
1437 if (ref_is_hidden(refname_nons, refname.buf) ||
1438 read_ref(refname.buf, &oid)) {
1439 packet_writer_error(writer, "unknown ref %s", refname_nons);
1440 die("unknown ref %s", refname_nons);
1441 }
1442 strbuf_release(&refname);
1443
1444 item = string_list_append(wanted_refs, refname_nons);
1445 item->util = oiddup(&oid);
1446
1447 o = parse_object_or_die(&oid, refname_nons);
1448 if (!(o->flags & WANTED)) {
1449 o->flags |= WANTED;
1450 add_object_array(o, NULL, want_obj);
1451 }
1452
1453 return 1;
1454 }
1455
1456 return 0;
1457 }
1458
1459 static int parse_have(const char *line, struct oid_array *haves)
1460 {
1461 const char *arg;
1462 if (skip_prefix(line, "have ", &arg)) {
1463 struct object_id oid;
1464
1465 if (get_oid_hex(arg, &oid))
1466 die("git upload-pack: expected SHA1 object, got '%s'", arg);
1467 oid_array_append(haves, &oid);
1468 return 1;
1469 }
1470
1471 return 0;
1472 }
1473
1474 static void process_args(struct packet_reader *request,
1475 struct upload_pack_data *data)
1476 {
1477 while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1478 const char *arg = request->line;
1479 const char *p;
1480
1481 /* process want */
1482 if (parse_want(&data->writer, arg, &data->want_obj))
1483 continue;
1484 if (data->allow_ref_in_want &&
1485 parse_want_ref(&data->writer, arg, &data->wanted_refs,
1486 &data->want_obj))
1487 continue;
1488 /* process have line */
1489 if (parse_have(arg, &data->haves))
1490 continue;
1491
1492 /* process args like thin-pack */
1493 if (!strcmp(arg, "thin-pack")) {
1494 data->use_thin_pack = 1;
1495 continue;
1496 }
1497 if (!strcmp(arg, "ofs-delta")) {
1498 data->use_ofs_delta = 1;
1499 continue;
1500 }
1501 if (!strcmp(arg, "no-progress")) {
1502 data->no_progress = 1;
1503 continue;
1504 }
1505 if (!strcmp(arg, "include-tag")) {
1506 data->use_include_tag = 1;
1507 continue;
1508 }
1509 if (!strcmp(arg, "done")) {
1510 data->done = 1;
1511 continue;
1512 }
1513 if (!strcmp(arg, "wait-for-done")) {
1514 data->wait_for_done = 1;
1515 continue;
1516 }
1517
1518 /* Shallow related arguments */
1519 if (process_shallow(arg, &data->shallows))
1520 continue;
1521 if (process_deepen(arg, &data->depth))
1522 continue;
1523 if (process_deepen_since(arg, &data->deepen_since,
1524 &data->deepen_rev_list))
1525 continue;
1526 if (process_deepen_not(arg, &data->deepen_not,
1527 &data->deepen_rev_list))
1528 continue;
1529 if (!strcmp(arg, "deepen-relative")) {
1530 data->deepen_relative = 1;
1531 continue;
1532 }
1533
1534 if (data->allow_filter && skip_prefix(arg, "filter ", &p)) {
1535 list_objects_filter_die_if_populated(&data->filter_options);
1536 parse_list_objects_filter(&data->filter_options, p);
1537 die_if_using_banned_filter(data);
1538 continue;
1539 }
1540
1541 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1542 data->allow_sideband_all) &&
1543 !strcmp(arg, "sideband-all")) {
1544 data->writer.use_sideband = 1;
1545 continue;
1546 }
1547
1548 if (skip_prefix(arg, "packfile-uris ", &p)) {
1549 string_list_split(&data->uri_protocols, p, ',', -1);
1550 continue;
1551 }
1552
1553 /* ignore unknown lines maybe? */
1554 die("unexpected line: '%s'", arg);
1555 }
1556
1557 if (data->uri_protocols.nr && !data->writer.use_sideband)
1558 string_list_clear(&data->uri_protocols, 0);
1559
1560 if (request->status != PACKET_READ_FLUSH)
1561 die(_("expected flush after fetch arguments"));
1562 }
1563
1564 static int process_haves(struct upload_pack_data *data, struct oid_array *common)
1565 {
1566 int i;
1567
1568 /* Process haves */
1569 for (i = 0; i < data->haves.nr; i++) {
1570 const struct object_id *oid = &data->haves.oid[i];
1571
1572 if (!has_object_file_with_flags(oid,
1573 OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
1574 continue;
1575
1576 oid_array_append(common, oid);
1577
1578 do_got_oid(data, oid);
1579 }
1580
1581 return 0;
1582 }
1583
1584 static int send_acks(struct upload_pack_data *data, struct oid_array *acks)
1585 {
1586 int i;
1587
1588 packet_writer_write(&data->writer, "acknowledgments\n");
1589
1590 /* Send Acks */
1591 if (!acks->nr)
1592 packet_writer_write(&data->writer, "NAK\n");
1593
1594 for (i = 0; i < acks->nr; i++) {
1595 packet_writer_write(&data->writer, "ACK %s\n",
1596 oid_to_hex(&acks->oid[i]));
1597 }
1598
1599 if (!data->wait_for_done && ok_to_give_up(data)) {
1600 /* Send Ready */
1601 packet_writer_write(&data->writer, "ready\n");
1602 return 1;
1603 }
1604
1605 return 0;
1606 }
1607
1608 static int process_haves_and_send_acks(struct upload_pack_data *data)
1609 {
1610 struct oid_array common = OID_ARRAY_INIT;
1611 int ret = 0;
1612
1613 process_haves(data, &common);
1614 if (data->done) {
1615 ret = 1;
1616 } else if (send_acks(data, &common)) {
1617 packet_writer_delim(&data->writer);
1618 ret = 1;
1619 } else {
1620 /* Add Flush */
1621 packet_writer_flush(&data->writer);
1622 ret = 0;
1623 }
1624
1625 oid_array_clear(&data->haves);
1626 oid_array_clear(&common);
1627 return ret;
1628 }
1629
1630 static void send_wanted_ref_info(struct upload_pack_data *data)
1631 {
1632 const struct string_list_item *item;
1633
1634 if (!data->wanted_refs.nr)
1635 return;
1636
1637 packet_writer_write(&data->writer, "wanted-refs\n");
1638
1639 for_each_string_list_item(item, &data->wanted_refs) {
1640 packet_writer_write(&data->writer, "%s %s\n",
1641 oid_to_hex(item->util),
1642 item->string);
1643 }
1644
1645 packet_writer_delim(&data->writer);
1646 }
1647
1648 static void send_shallow_info(struct upload_pack_data *data)
1649 {
1650 /* No shallow info needs to be sent */
1651 if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1652 !is_repository_shallow(the_repository))
1653 return;
1654
1655 packet_writer_write(&data->writer, "shallow-info\n");
1656
1657 if (!send_shallow_list(data) &&
1658 is_repository_shallow(the_repository))
1659 deepen(data, INFINITE_DEPTH);
1660
1661 packet_delim(1);
1662 }
1663
1664 enum fetch_state {
1665 FETCH_PROCESS_ARGS = 0,
1666 FETCH_SEND_ACKS,
1667 FETCH_SEND_PACK,
1668 FETCH_DONE,
1669 };
1670
1671 int upload_pack_v2(struct repository *r, struct packet_reader *request)
1672 {
1673 enum fetch_state state = FETCH_PROCESS_ARGS;
1674 struct upload_pack_data data;
1675
1676 clear_object_flags(ALL_FLAGS);
1677
1678 upload_pack_data_init(&data);
1679 data.use_sideband = LARGE_PACKET_MAX;
1680
1681 git_config(upload_pack_config, &data);
1682
1683 while (state != FETCH_DONE) {
1684 switch (state) {
1685 case FETCH_PROCESS_ARGS:
1686 process_args(request, &data);
1687
1688 if (!data.want_obj.nr && !data.wait_for_done) {
1689 /*
1690 * Request didn't contain any 'want' lines (and
1691 * the request does not contain
1692 * "wait-for-done", in which it is reasonable
1693 * to just send 'have's without 'want's); guess
1694 * they didn't want anything.
1695 */
1696 state = FETCH_DONE;
1697 } else if (data.haves.nr) {
1698 /*
1699 * Request had 'have' lines, so lets ACK them.
1700 */
1701 state = FETCH_SEND_ACKS;
1702 } else {
1703 /*
1704 * Request had 'want's but no 'have's so we can
1705 * immedietly go to construct and send a pack.
1706 */
1707 state = FETCH_SEND_PACK;
1708 }
1709 break;
1710 case FETCH_SEND_ACKS:
1711 if (process_haves_and_send_acks(&data))
1712 state = FETCH_SEND_PACK;
1713 else
1714 state = FETCH_DONE;
1715 break;
1716 case FETCH_SEND_PACK:
1717 send_wanted_ref_info(&data);
1718 send_shallow_info(&data);
1719
1720 if (data.uri_protocols.nr) {
1721 create_pack_file(&data, &data.uri_protocols);
1722 } else {
1723 packet_writer_write(&data.writer, "packfile\n");
1724 create_pack_file(&data, NULL);
1725 }
1726 state = FETCH_DONE;
1727 break;
1728 case FETCH_DONE:
1729 continue;
1730 }
1731 }
1732
1733 upload_pack_data_clear(&data);
1734 return 0;
1735 }
1736
1737 int upload_pack_advertise(struct repository *r,
1738 struct strbuf *value)
1739 {
1740 if (value) {
1741 int allow_filter_value;
1742 int allow_ref_in_want;
1743 int allow_sideband_all_value;
1744 char *str = NULL;
1745
1746 strbuf_addstr(value, "shallow wait-for-done");
1747
1748 if (!repo_config_get_bool(the_repository,
1749 "uploadpack.allowfilter",
1750 &allow_filter_value) &&
1751 allow_filter_value)
1752 strbuf_addstr(value, " filter");
1753
1754 if (!repo_config_get_bool(the_repository,
1755 "uploadpack.allowrefinwant",
1756 &allow_ref_in_want) &&
1757 allow_ref_in_want)
1758 strbuf_addstr(value, " ref-in-want");
1759
1760 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1761 (!repo_config_get_bool(the_repository,
1762 "uploadpack.allowsidebandall",
1763 &allow_sideband_all_value) &&
1764 allow_sideband_all_value))
1765 strbuf_addstr(value, " sideband-all");
1766
1767 if (!repo_config_get_string(the_repository,
1768 "uploadpack.blobpackfileuri",
1769 &str) &&
1770 str) {
1771 strbuf_addstr(value, " packfile-uris");
1772 free(str);
1773 }
1774 }
1775
1776 return 1;
1777 }
git for Debian