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[thirdparty/git.git] / upload-pack.c
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 struct object *o;
600 FILE *cmd_in = NULL;
601 int i;
602
603 strvec_pushl(&cmd->args, "rev-list", "--stdin", NULL);
604 cmd->git_cmd = 1;
605 cmd->no_stderr = 1;
606 cmd->in = -1;
607 cmd->out = -1;
608
609 /*
610 * If the next rev-list --stdin encounters an unknown commit,
611 * it terminates, which will cause SIGPIPE in the write loop
612 * below.
613 */
614 sigchain_push(SIGPIPE, SIG_IGN);
615
616 if (start_command(cmd))
617 goto error;
618
619 cmd_in = xfdopen(cmd->in, "w");
620
621 for (i = get_max_object_index(); 0 < i; ) {
622 o = get_indexed_object(--i);
623 if (!o)
624 continue;
625 if (reachable && o->type == OBJ_COMMIT)
626 o->flags &= ~TMP_MARK;
627 if (!is_our_ref(o, allow_uor))
628 continue;
629 if (fprintf(cmd_in, "^%s\n", oid_to_hex(&o->oid)) < 0)
630 goto error;
631 }
632 for (i = 0; i < src->nr; i++) {
633 o = src->objects[i].item;
634 if (is_our_ref(o, allow_uor)) {
635 if (reachable)
636 add_object_array(o, NULL, reachable);
637 continue;
638 }
639 if (reachable && o->type == OBJ_COMMIT)
640 o->flags |= TMP_MARK;
641 if (fprintf(cmd_in, "%s\n", oid_to_hex(&o->oid)) < 0)
642 goto error;
643 }
644 if (ferror(cmd_in) || fflush(cmd_in))
645 goto error;
646 fclose(cmd_in);
647 cmd->in = -1;
648 sigchain_pop(SIGPIPE);
649
650 return 0;
651
652 error:
653 sigchain_pop(SIGPIPE);
654
655 if (cmd_in)
656 fclose(cmd_in);
657 if (cmd->out >= 0)
658 close(cmd->out);
659 return -1;
660 }
661
662 static int get_reachable_list(struct upload_pack_data *data,
663 struct object_array *reachable)
664 {
665 struct child_process cmd = CHILD_PROCESS_INIT;
666 int i;
667 struct object *o;
668 char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
669 const unsigned hexsz = the_hash_algo->hexsz;
670
671 if (do_reachable_revlist(&cmd, &data->shallows, reachable,
672 data->allow_uor) < 0)
673 return -1;
674
675 while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
676 struct object_id oid;
677 const char *p;
678
679 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
680 break;
681
682 o = lookup_object(the_repository, &oid);
683 if (o && o->type == OBJ_COMMIT) {
684 o->flags &= ~TMP_MARK;
685 }
686 }
687 for (i = get_max_object_index(); 0 < i; i--) {
688 o = get_indexed_object(i - 1);
689 if (o && o->type == OBJ_COMMIT &&
690 (o->flags & TMP_MARK)) {
691 add_object_array(o, NULL, reachable);
692 o->flags &= ~TMP_MARK;
693 }
694 }
695 close(cmd.out);
696
697 if (finish_command(&cmd))
698 return -1;
699
700 return 0;
701 }
702
703 static int has_unreachable(struct object_array *src, enum allow_uor allow_uor)
704 {
705 struct child_process cmd = CHILD_PROCESS_INIT;
706 char buf[1];
707 int i;
708
709 if (do_reachable_revlist(&cmd, src, NULL, allow_uor) < 0)
710 return 1;
711
712 /*
713 * The commits out of the rev-list are not ancestors of
714 * our ref.
715 */
716 i = read_in_full(cmd.out, buf, 1);
717 if (i)
718 goto error;
719 close(cmd.out);
720 cmd.out = -1;
721
722 /*
723 * rev-list may have died by encountering a bad commit
724 * in the history, in which case we do want to bail out
725 * even when it showed no commit.
726 */
727 if (finish_command(&cmd))
728 goto error;
729
730 /* All the non-tip ones are ancestors of what we advertised */
731 return 0;
732
733 error:
734 if (cmd.out >= 0)
735 close(cmd.out);
736 return 1;
737 }
738
739 static void check_non_tip(struct upload_pack_data *data)
740 {
741 int i;
742
743 /*
744 * In the normal in-process case without
745 * uploadpack.allowReachableSHA1InWant,
746 * non-tip requests can never happen.
747 */
748 if (!data->stateless_rpc && !(data->allow_uor & ALLOW_REACHABLE_SHA1))
749 goto error;
750 if (!has_unreachable(&data->want_obj, data->allow_uor))
751 /* All the non-tip ones are ancestors of what we advertised */
752 return;
753
754 error:
755 /* Pick one of them (we know there at least is one) */
756 for (i = 0; i < data->want_obj.nr; i++) {
757 struct object *o = data->want_obj.objects[i].item;
758 if (!is_our_ref(o, data->allow_uor)) {
759 packet_writer_error(&data->writer,
760 "upload-pack: not our ref %s",
761 oid_to_hex(&o->oid));
762 die("git upload-pack: not our ref %s",
763 oid_to_hex(&o->oid));
764 }
765 }
766 }
767
768 static void send_shallow(struct upload_pack_data *data,
769 struct commit_list *result)
770 {
771 while (result) {
772 struct object *object = &result->item->object;
773 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
774 packet_writer_write(&data->writer, "shallow %s",
775 oid_to_hex(&object->oid));
776 register_shallow(the_repository, &object->oid);
777 data->shallow_nr++;
778 }
779 result = result->next;
780 }
781 }
782
783 static void send_unshallow(struct upload_pack_data *data)
784 {
785 int i;
786
787 for (i = 0; i < data->shallows.nr; i++) {
788 struct object *object = data->shallows.objects[i].item;
789 if (object->flags & NOT_SHALLOW) {
790 struct commit_list *parents;
791 packet_writer_write(&data->writer, "unshallow %s",
792 oid_to_hex(&object->oid));
793 object->flags &= ~CLIENT_SHALLOW;
794 /*
795 * We want to _register_ "object" as shallow, but we
796 * also need to traverse object's parents to deepen a
797 * shallow clone. Unregister it for now so we can
798 * parse and add the parents to the want list, then
799 * re-register it.
800 */
801 unregister_shallow(&object->oid);
802 object->parsed = 0;
803 parse_commit_or_die((struct commit *)object);
804 parents = ((struct commit *)object)->parents;
805 while (parents) {
806 add_object_array(&parents->item->object,
807 NULL, &data->want_obj);
808 parents = parents->next;
809 }
810 add_object_array(object, NULL, &data->extra_edge_obj);
811 }
812 /* make sure commit traversal conforms to client */
813 register_shallow(the_repository, &object->oid);
814 }
815 }
816
817 static int check_ref(const char *refname_full, const struct object_id *oid,
818 int flag, void *cb_data);
819 static void deepen(struct upload_pack_data *data, int depth)
820 {
821 if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
822 int i;
823
824 for (i = 0; i < data->shallows.nr; i++) {
825 struct object *object = data->shallows.objects[i].item;
826 object->flags |= NOT_SHALLOW;
827 }
828 } else if (data->deepen_relative) {
829 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
830 struct commit_list *result;
831
832 /*
833 * Checking for reachable shallows requires that our refs be
834 * marked with OUR_REF.
835 */
836 head_ref_namespaced(check_ref, NULL);
837 for_each_namespaced_ref(check_ref, NULL);
838
839 get_reachable_list(data, &reachable_shallows);
840 result = get_shallow_commits(&reachable_shallows,
841 depth + 1,
842 SHALLOW, NOT_SHALLOW);
843 send_shallow(data, result);
844 free_commit_list(result);
845 object_array_clear(&reachable_shallows);
846 } else {
847 struct commit_list *result;
848
849 result = get_shallow_commits(&data->want_obj, depth,
850 SHALLOW, NOT_SHALLOW);
851 send_shallow(data, result);
852 free_commit_list(result);
853 }
854
855 send_unshallow(data);
856 }
857
858 static void deepen_by_rev_list(struct upload_pack_data *data,
859 int ac,
860 const char **av)
861 {
862 struct commit_list *result;
863
864 disable_commit_graph(the_repository);
865 result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
866 send_shallow(data, result);
867 free_commit_list(result);
868 send_unshallow(data);
869 }
870
871 /* Returns 1 if a shallow list is sent or 0 otherwise */
872 static int send_shallow_list(struct upload_pack_data *data)
873 {
874 int ret = 0;
875
876 if (data->depth > 0 && data->deepen_rev_list)
877 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
878 if (data->depth > 0) {
879 deepen(data, data->depth);
880 ret = 1;
881 } else if (data->deepen_rev_list) {
882 struct strvec av = STRVEC_INIT;
883 int i;
884
885 strvec_push(&av, "rev-list");
886 if (data->deepen_since)
887 strvec_pushf(&av, "--max-age=%"PRItime, data->deepen_since);
888 if (data->deepen_not.nr) {
889 strvec_push(&av, "--not");
890 for (i = 0; i < data->deepen_not.nr; i++) {
891 struct string_list_item *s = data->deepen_not.items + i;
892 strvec_push(&av, s->string);
893 }
894 strvec_push(&av, "--not");
895 }
896 for (i = 0; i < data->want_obj.nr; i++) {
897 struct object *o = data->want_obj.objects[i].item;
898 strvec_push(&av, oid_to_hex(&o->oid));
899 }
900 deepen_by_rev_list(data, av.nr, av.v);
901 strvec_clear(&av);
902 ret = 1;
903 } else {
904 if (data->shallows.nr > 0) {
905 int i;
906 for (i = 0; i < data->shallows.nr; i++)
907 register_shallow(the_repository,
908 &data->shallows.objects[i].item->oid);
909 }
910 }
911
912 data->shallow_nr += data->shallows.nr;
913 return ret;
914 }
915
916 static int process_shallow(const char *line, struct object_array *shallows)
917 {
918 const char *arg;
919 if (skip_prefix(line, "shallow ", &arg)) {
920 struct object_id oid;
921 struct object *object;
922 if (get_oid_hex(arg, &oid))
923 die("invalid shallow line: %s", line);
924 object = parse_object(the_repository, &oid);
925 if (!object)
926 return 1;
927 if (object->type != OBJ_COMMIT)
928 die("invalid shallow object %s", oid_to_hex(&oid));
929 if (!(object->flags & CLIENT_SHALLOW)) {
930 object->flags |= CLIENT_SHALLOW;
931 add_object_array(object, NULL, shallows);
932 }
933 return 1;
934 }
935
936 return 0;
937 }
938
939 static int process_deepen(const char *line, int *depth)
940 {
941 const char *arg;
942 if (skip_prefix(line, "deepen ", &arg)) {
943 char *end = NULL;
944 *depth = (int)strtol(arg, &end, 0);
945 if (!end || *end || *depth <= 0)
946 die("Invalid deepen: %s", line);
947 return 1;
948 }
949
950 return 0;
951 }
952
953 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
954 {
955 const char *arg;
956 if (skip_prefix(line, "deepen-since ", &arg)) {
957 char *end = NULL;
958 *deepen_since = parse_timestamp(arg, &end, 0);
959 if (!end || *end || !deepen_since ||
960 /* revisions.c's max_age -1 is special */
961 *deepen_since == -1)
962 die("Invalid deepen-since: %s", line);
963 *deepen_rev_list = 1;
964 return 1;
965 }
966 return 0;
967 }
968
969 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
970 {
971 const char *arg;
972 if (skip_prefix(line, "deepen-not ", &arg)) {
973 char *ref = NULL;
974 struct object_id oid;
975 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
976 die("git upload-pack: ambiguous deepen-not: %s", line);
977 string_list_append(deepen_not, ref);
978 free(ref);
979 *deepen_rev_list = 1;
980 return 1;
981 }
982 return 0;
983 }
984
985 NORETURN __attribute__((format(printf,2,3)))
986 static void send_err_and_die(struct upload_pack_data *data,
987 const char *fmt, ...)
988 {
989 struct strbuf buf = STRBUF_INIT;
990 va_list ap;
991
992 va_start(ap, fmt);
993 strbuf_vaddf(&buf, fmt, ap);
994 va_end(ap);
995
996 packet_writer_error(&data->writer, "%s", buf.buf);
997 die("%s", buf.buf);
998 }
999
1000 static void check_one_filter(struct upload_pack_data *data,
1001 struct list_objects_filter_options *opts)
1002 {
1003 const char *key = list_object_filter_config_name(opts->choice);
1004 struct string_list_item *item = string_list_lookup(&data->allowed_filters,
1005 key);
1006 int allowed;
1007
1008 if (item)
1009 allowed = (intptr_t)item->util;
1010 else
1011 allowed = data->allow_filter_fallback;
1012
1013 if (!allowed)
1014 send_err_and_die(data, "filter '%s' not supported", key);
1015
1016 if (opts->choice == LOFC_TREE_DEPTH &&
1017 opts->tree_exclude_depth > data->tree_filter_max_depth)
1018 send_err_and_die(data,
1019 "tree filter allows max depth %lu, but got %lu",
1020 data->tree_filter_max_depth,
1021 opts->tree_exclude_depth);
1022 }
1023
1024 static void check_filter_recurse(struct upload_pack_data *data,
1025 struct list_objects_filter_options *opts)
1026 {
1027 size_t i;
1028
1029 check_one_filter(data, opts);
1030 if (opts->choice != LOFC_COMBINE)
1031 return;
1032
1033 for (i = 0; i < opts->sub_nr; i++)
1034 check_filter_recurse(data, &opts->sub[i]);
1035 }
1036
1037 static void die_if_using_banned_filter(struct upload_pack_data *data)
1038 {
1039 check_filter_recurse(data, &data->filter_options);
1040 }
1041
1042 static void receive_needs(struct upload_pack_data *data,
1043 struct packet_reader *reader)
1044 {
1045 int has_non_tip = 0;
1046
1047 data->shallow_nr = 0;
1048 for (;;) {
1049 struct object *o;
1050 const char *features;
1051 struct object_id oid_buf;
1052 const char *arg;
1053 int feature_len;
1054
1055 reset_timeout(data->timeout);
1056 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
1057 break;
1058
1059 if (process_shallow(reader->line, &data->shallows))
1060 continue;
1061 if (process_deepen(reader->line, &data->depth))
1062 continue;
1063 if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
1064 continue;
1065 if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
1066 continue;
1067
1068 if (skip_prefix(reader->line, "filter ", &arg)) {
1069 if (!data->filter_capability_requested)
1070 die("git upload-pack: filtering capability not negotiated");
1071 list_objects_filter_die_if_populated(&data->filter_options);
1072 parse_list_objects_filter(&data->filter_options, arg);
1073 die_if_using_banned_filter(data);
1074 continue;
1075 }
1076
1077 if (!skip_prefix(reader->line, "want ", &arg) ||
1078 parse_oid_hex(arg, &oid_buf, &features))
1079 die("git upload-pack: protocol error, "
1080 "expected to get object ID, not '%s'", reader->line);
1081
1082 if (parse_feature_request(features, "deepen-relative"))
1083 data->deepen_relative = 1;
1084 if (parse_feature_request(features, "multi_ack_detailed"))
1085 data->multi_ack = MULTI_ACK_DETAILED;
1086 else if (parse_feature_request(features, "multi_ack"))
1087 data->multi_ack = MULTI_ACK;
1088 if (parse_feature_request(features, "no-done"))
1089 data->no_done = 1;
1090 if (parse_feature_request(features, "thin-pack"))
1091 data->use_thin_pack = 1;
1092 if (parse_feature_request(features, "ofs-delta"))
1093 data->use_ofs_delta = 1;
1094 if (parse_feature_request(features, "side-band-64k"))
1095 data->use_sideband = LARGE_PACKET_MAX;
1096 else if (parse_feature_request(features, "side-band"))
1097 data->use_sideband = DEFAULT_PACKET_MAX;
1098 if (parse_feature_request(features, "no-progress"))
1099 data->no_progress = 1;
1100 if (parse_feature_request(features, "include-tag"))
1101 data->use_include_tag = 1;
1102 if (data->allow_filter &&
1103 parse_feature_request(features, "filter"))
1104 data->filter_capability_requested = 1;
1105
1106 arg = parse_feature_value(features, "session-id", &feature_len, NULL);
1107 if (arg) {
1108 char *client_sid = xstrndup(arg, feature_len);
1109 trace2_data_string("transfer", NULL, "client-sid", client_sid);
1110 free(client_sid);
1111 }
1112
1113 o = parse_object(the_repository, &oid_buf);
1114 if (!o) {
1115 packet_writer_error(&data->writer,
1116 "upload-pack: not our ref %s",
1117 oid_to_hex(&oid_buf));
1118 die("git upload-pack: not our ref %s",
1119 oid_to_hex(&oid_buf));
1120 }
1121 if (!(o->flags & WANTED)) {
1122 o->flags |= WANTED;
1123 if (!((data->allow_uor & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
1124 || is_our_ref(o, data->allow_uor)))
1125 has_non_tip = 1;
1126 add_object_array(o, NULL, &data->want_obj);
1127 }
1128 }
1129
1130 /*
1131 * We have sent all our refs already, and the other end
1132 * should have chosen out of them. When we are operating
1133 * in the stateless RPC mode, however, their choice may
1134 * have been based on the set of older refs advertised
1135 * by another process that handled the initial request.
1136 */
1137 if (has_non_tip)
1138 check_non_tip(data);
1139
1140 if (!data->use_sideband && data->daemon_mode)
1141 data->no_progress = 1;
1142
1143 if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1144 return;
1145
1146 if (send_shallow_list(data))
1147 packet_flush(1);
1148 }
1149
1150 /* return non-zero if the ref is hidden, otherwise 0 */
1151 static int mark_our_ref(const char *refname, const char *refname_full,
1152 const struct object_id *oid)
1153 {
1154 struct object *o = lookup_unknown_object(the_repository, oid);
1155
1156 if (ref_is_hidden(refname, refname_full)) {
1157 o->flags |= HIDDEN_REF;
1158 return 1;
1159 }
1160 o->flags |= OUR_REF;
1161 return 0;
1162 }
1163
1164 static int check_ref(const char *refname_full, const struct object_id *oid,
1165 int flag, void *cb_data)
1166 {
1167 const char *refname = strip_namespace(refname_full);
1168
1169 mark_our_ref(refname, refname_full, oid);
1170 return 0;
1171 }
1172
1173 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1174 {
1175 struct string_list_item *item;
1176
1177 if (!symref->nr)
1178 return;
1179 for_each_string_list_item(item, symref)
1180 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1181 }
1182
1183 static void format_session_id(struct strbuf *buf, struct upload_pack_data *d) {
1184 if (d->advertise_sid)
1185 strbuf_addf(buf, " session-id=%s", trace2_session_id());
1186 }
1187
1188 static int send_ref(const char *refname, const struct object_id *oid,
1189 int flag, void *cb_data)
1190 {
1191 static const char *capabilities = "multi_ack thin-pack side-band"
1192 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1193 " deepen-relative no-progress include-tag multi_ack_detailed";
1194 const char *refname_nons = strip_namespace(refname);
1195 struct object_id peeled;
1196 struct upload_pack_data *data = cb_data;
1197
1198 if (mark_our_ref(refname_nons, refname, oid))
1199 return 0;
1200
1201 if (capabilities) {
1202 struct strbuf symref_info = STRBUF_INIT;
1203 struct strbuf session_id = STRBUF_INIT;
1204
1205 format_symref_info(&symref_info, &data->symref);
1206 format_session_id(&session_id, data);
1207 packet_fwrite_fmt(stdout, "%s %s%c%s%s%s%s%s%s%s object-format=%s agent=%s\n",
1208 oid_to_hex(oid), refname_nons,
1209 0, capabilities,
1210 (data->allow_uor & ALLOW_TIP_SHA1) ?
1211 " allow-tip-sha1-in-want" : "",
1212 (data->allow_uor & ALLOW_REACHABLE_SHA1) ?
1213 " allow-reachable-sha1-in-want" : "",
1214 data->no_done ? " no-done" : "",
1215 symref_info.buf,
1216 data->allow_filter ? " filter" : "",
1217 session_id.buf,
1218 the_hash_algo->name,
1219 git_user_agent_sanitized());
1220 strbuf_release(&symref_info);
1221 strbuf_release(&session_id);
1222 } else {
1223 packet_fwrite_fmt(stdout, "%s %s\n", oid_to_hex(oid), refname_nons);
1224 }
1225 capabilities = NULL;
1226 if (!peel_iterated_oid(oid, &peeled))
1227 packet_fwrite_fmt(stdout, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1228 return 0;
1229 }
1230
1231 static int find_symref(const char *refname, const struct object_id *oid,
1232 int flag, void *cb_data)
1233 {
1234 const char *symref_target;
1235 struct string_list_item *item;
1236
1237 if ((flag & REF_ISSYMREF) == 0)
1238 return 0;
1239 symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1240 if (!symref_target || (flag & REF_ISSYMREF) == 0)
1241 die("'%s' is a symref but it is not?", refname);
1242 item = string_list_append(cb_data, strip_namespace(refname));
1243 item->util = xstrdup(strip_namespace(symref_target));
1244 return 0;
1245 }
1246
1247 static int parse_object_filter_config(const char *var, const char *value,
1248 struct upload_pack_data *data)
1249 {
1250 struct strbuf buf = STRBUF_INIT;
1251 const char *sub, *key;
1252 size_t sub_len;
1253
1254 if (parse_config_key(var, "uploadpackfilter", &sub, &sub_len, &key))
1255 return 0;
1256
1257 if (!sub) {
1258 if (!strcmp(key, "allow"))
1259 data->allow_filter_fallback = git_config_bool(var, value);
1260 return 0;
1261 }
1262
1263 strbuf_add(&buf, sub, sub_len);
1264
1265 if (!strcmp(key, "allow"))
1266 string_list_insert(&data->allowed_filters, buf.buf)->util =
1267 (void *)(intptr_t)git_config_bool(var, value);
1268 else if (!strcmp(buf.buf, "tree") && !strcmp(key, "maxdepth")) {
1269 if (!value) {
1270 strbuf_release(&buf);
1271 return config_error_nonbool(var);
1272 }
1273 string_list_insert(&data->allowed_filters, buf.buf)->util =
1274 (void *)(intptr_t)1;
1275 data->tree_filter_max_depth = git_config_ulong(var, value);
1276 }
1277
1278 strbuf_release(&buf);
1279 return 0;
1280 }
1281
1282 static int upload_pack_config(const char *var, const char *value, void *cb_data)
1283 {
1284 struct upload_pack_data *data = cb_data;
1285
1286 if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1287 if (git_config_bool(var, value))
1288 data->allow_uor |= ALLOW_TIP_SHA1;
1289 else
1290 data->allow_uor &= ~ALLOW_TIP_SHA1;
1291 } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1292 if (git_config_bool(var, value))
1293 data->allow_uor |= ALLOW_REACHABLE_SHA1;
1294 else
1295 data->allow_uor &= ~ALLOW_REACHABLE_SHA1;
1296 } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1297 if (git_config_bool(var, value))
1298 data->allow_uor |= ALLOW_ANY_SHA1;
1299 else
1300 data->allow_uor &= ~ALLOW_ANY_SHA1;
1301 } else if (!strcmp("uploadpack.keepalive", var)) {
1302 data->keepalive = git_config_int(var, value);
1303 if (!data->keepalive)
1304 data->keepalive = -1;
1305 } else if (!strcmp("uploadpack.allowfilter", var)) {
1306 data->allow_filter = git_config_bool(var, value);
1307 } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1308 data->allow_ref_in_want = git_config_bool(var, value);
1309 } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1310 data->allow_sideband_all = git_config_bool(var, value);
1311 } else if (!strcmp("core.precomposeunicode", var)) {
1312 precomposed_unicode = git_config_bool(var, value);
1313 } else if (!strcmp("transfer.advertisesid", var)) {
1314 data->advertise_sid = git_config_bool(var, value);
1315 }
1316
1317 if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
1318 current_config_scope() != CONFIG_SCOPE_WORKTREE) {
1319 if (!strcmp("uploadpack.packobjectshook", var))
1320 return git_config_string(&data->pack_objects_hook, var, value);
1321 }
1322
1323 if (parse_object_filter_config(var, value, data) < 0)
1324 return -1;
1325
1326 return parse_hide_refs_config(var, value, "uploadpack");
1327 }
1328
1329 void upload_pack(const int advertise_refs, const int stateless_rpc,
1330 const int timeout)
1331 {
1332 struct packet_reader reader;
1333 struct upload_pack_data data;
1334
1335 upload_pack_data_init(&data);
1336
1337 git_config(upload_pack_config, &data);
1338
1339 data.stateless_rpc = stateless_rpc;
1340 data.timeout = timeout;
1341 if (data.timeout)
1342 data.daemon_mode = 1;
1343
1344 head_ref_namespaced(find_symref, &data.symref);
1345
1346 if (advertise_refs || !data.stateless_rpc) {
1347 reset_timeout(data.timeout);
1348 if (advertise_refs)
1349 data.no_done = 1;
1350 head_ref_namespaced(send_ref, &data);
1351 for_each_namespaced_ref(send_ref, &data);
1352 /*
1353 * fflush stdout before calling advertise_shallow_grafts because send_ref
1354 * uses stdio.
1355 */
1356 fflush_or_die(stdout);
1357 advertise_shallow_grafts(1);
1358 packet_flush(1);
1359 } else {
1360 head_ref_namespaced(check_ref, NULL);
1361 for_each_namespaced_ref(check_ref, NULL);
1362 }
1363
1364 if (!advertise_refs) {
1365 packet_reader_init(&reader, 0, NULL, 0,
1366 PACKET_READ_CHOMP_NEWLINE |
1367 PACKET_READ_DIE_ON_ERR_PACKET);
1368
1369 receive_needs(&data, &reader);
1370
1371 /*
1372 * An EOF at this exact point in negotiation should be
1373 * acceptable from stateless clients as they will consume the
1374 * shallow list before doing subsequent rpc with haves/etc.
1375 */
1376 if (data.stateless_rpc)
1377 reader.options |= PACKET_READ_GENTLE_ON_EOF;
1378
1379 if (data.want_obj.nr &&
1380 packet_reader_peek(&reader) != PACKET_READ_EOF) {
1381 reader.options &= ~PACKET_READ_GENTLE_ON_EOF;
1382 get_common_commits(&data, &reader);
1383 create_pack_file(&data, NULL);
1384 }
1385 }
1386
1387 upload_pack_data_clear(&data);
1388 }
1389
1390 static int parse_want(struct packet_writer *writer, const char *line,
1391 struct object_array *want_obj)
1392 {
1393 const char *arg;
1394 if (skip_prefix(line, "want ", &arg)) {
1395 struct object_id oid;
1396 struct object *o;
1397
1398 if (get_oid_hex(arg, &oid))
1399 die("git upload-pack: protocol error, "
1400 "expected to get oid, not '%s'", line);
1401
1402 o = parse_object(the_repository, &oid);
1403 if (!o) {
1404 packet_writer_error(writer,
1405 "upload-pack: not our ref %s",
1406 oid_to_hex(&oid));
1407 die("git upload-pack: not our ref %s",
1408 oid_to_hex(&oid));
1409 }
1410
1411 if (!(o->flags & WANTED)) {
1412 o->flags |= WANTED;
1413 add_object_array(o, NULL, want_obj);
1414 }
1415
1416 return 1;
1417 }
1418
1419 return 0;
1420 }
1421
1422 static int parse_want_ref(struct packet_writer *writer, const char *line,
1423 struct string_list *wanted_refs,
1424 struct object_array *want_obj)
1425 {
1426 const char *refname_nons;
1427 if (skip_prefix(line, "want-ref ", &refname_nons)) {
1428 struct object_id oid;
1429 struct string_list_item *item;
1430 struct object *o;
1431 struct strbuf refname = STRBUF_INIT;
1432
1433 strbuf_addf(&refname, "%s%s", get_git_namespace(), refname_nons);
1434 if (ref_is_hidden(refname_nons, refname.buf) ||
1435 read_ref(refname.buf, &oid)) {
1436 packet_writer_error(writer, "unknown ref %s", refname_nons);
1437 die("unknown ref %s", refname_nons);
1438 }
1439 strbuf_release(&refname);
1440
1441 item = string_list_append(wanted_refs, refname_nons);
1442 item->util = oiddup(&oid);
1443
1444 o = parse_object_or_die(&oid, refname_nons);
1445 if (!(o->flags & WANTED)) {
1446 o->flags |= WANTED;
1447 add_object_array(o, NULL, want_obj);
1448 }
1449
1450 return 1;
1451 }
1452
1453 return 0;
1454 }
1455
1456 static int parse_have(const char *line, struct oid_array *haves)
1457 {
1458 const char *arg;
1459 if (skip_prefix(line, "have ", &arg)) {
1460 struct object_id oid;
1461
1462 if (get_oid_hex(arg, &oid))
1463 die("git upload-pack: expected SHA1 object, got '%s'", arg);
1464 oid_array_append(haves, &oid);
1465 return 1;
1466 }
1467
1468 return 0;
1469 }
1470
1471 static void process_args(struct packet_reader *request,
1472 struct upload_pack_data *data)
1473 {
1474 while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1475 const char *arg = request->line;
1476 const char *p;
1477
1478 /* process want */
1479 if (parse_want(&data->writer, arg, &data->want_obj))
1480 continue;
1481 if (data->allow_ref_in_want &&
1482 parse_want_ref(&data->writer, arg, &data->wanted_refs,
1483 &data->want_obj))
1484 continue;
1485 /* process have line */
1486 if (parse_have(arg, &data->haves))
1487 continue;
1488
1489 /* process args like thin-pack */
1490 if (!strcmp(arg, "thin-pack")) {
1491 data->use_thin_pack = 1;
1492 continue;
1493 }
1494 if (!strcmp(arg, "ofs-delta")) {
1495 data->use_ofs_delta = 1;
1496 continue;
1497 }
1498 if (!strcmp(arg, "no-progress")) {
1499 data->no_progress = 1;
1500 continue;
1501 }
1502 if (!strcmp(arg, "include-tag")) {
1503 data->use_include_tag = 1;
1504 continue;
1505 }
1506 if (!strcmp(arg, "done")) {
1507 data->done = 1;
1508 continue;
1509 }
1510 if (!strcmp(arg, "wait-for-done")) {
1511 data->wait_for_done = 1;
1512 continue;
1513 }
1514
1515 /* Shallow related arguments */
1516 if (process_shallow(arg, &data->shallows))
1517 continue;
1518 if (process_deepen(arg, &data->depth))
1519 continue;
1520 if (process_deepen_since(arg, &data->deepen_since,
1521 &data->deepen_rev_list))
1522 continue;
1523 if (process_deepen_not(arg, &data->deepen_not,
1524 &data->deepen_rev_list))
1525 continue;
1526 if (!strcmp(arg, "deepen-relative")) {
1527 data->deepen_relative = 1;
1528 continue;
1529 }
1530
1531 if (data->allow_filter && skip_prefix(arg, "filter ", &p)) {
1532 list_objects_filter_die_if_populated(&data->filter_options);
1533 parse_list_objects_filter(&data->filter_options, p);
1534 die_if_using_banned_filter(data);
1535 continue;
1536 }
1537
1538 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1539 data->allow_sideband_all) &&
1540 !strcmp(arg, "sideband-all")) {
1541 data->writer.use_sideband = 1;
1542 continue;
1543 }
1544
1545 if (skip_prefix(arg, "packfile-uris ", &p)) {
1546 string_list_split(&data->uri_protocols, p, ',', -1);
1547 continue;
1548 }
1549
1550 /* ignore unknown lines maybe? */
1551 die("unexpected line: '%s'", arg);
1552 }
1553
1554 if (data->uri_protocols.nr && !data->writer.use_sideband)
1555 string_list_clear(&data->uri_protocols, 0);
1556
1557 if (request->status != PACKET_READ_FLUSH)
1558 die(_("expected flush after fetch arguments"));
1559 }
1560
1561 static int process_haves(struct upload_pack_data *data, struct oid_array *common)
1562 {
1563 int i;
1564
1565 /* Process haves */
1566 for (i = 0; i < data->haves.nr; i++) {
1567 const struct object_id *oid = &data->haves.oid[i];
1568
1569 if (!has_object_file_with_flags(oid,
1570 OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
1571 continue;
1572
1573 oid_array_append(common, oid);
1574
1575 do_got_oid(data, oid);
1576 }
1577
1578 return 0;
1579 }
1580
1581 static int send_acks(struct upload_pack_data *data, struct oid_array *acks)
1582 {
1583 int i;
1584
1585 packet_writer_write(&data->writer, "acknowledgments\n");
1586
1587 /* Send Acks */
1588 if (!acks->nr)
1589 packet_writer_write(&data->writer, "NAK\n");
1590
1591 for (i = 0; i < acks->nr; i++) {
1592 packet_writer_write(&data->writer, "ACK %s\n",
1593 oid_to_hex(&acks->oid[i]));
1594 }
1595
1596 if (!data->wait_for_done && ok_to_give_up(data)) {
1597 /* Send Ready */
1598 packet_writer_write(&data->writer, "ready\n");
1599 return 1;
1600 }
1601
1602 return 0;
1603 }
1604
1605 static int process_haves_and_send_acks(struct upload_pack_data *data)
1606 {
1607 struct oid_array common = OID_ARRAY_INIT;
1608 int ret = 0;
1609
1610 process_haves(data, &common);
1611 if (data->done) {
1612 ret = 1;
1613 } else if (send_acks(data, &common)) {
1614 packet_writer_delim(&data->writer);
1615 ret = 1;
1616 } else {
1617 /* Add Flush */
1618 packet_writer_flush(&data->writer);
1619 ret = 0;
1620 }
1621
1622 oid_array_clear(&data->haves);
1623 oid_array_clear(&common);
1624 return ret;
1625 }
1626
1627 static void send_wanted_ref_info(struct upload_pack_data *data)
1628 {
1629 const struct string_list_item *item;
1630
1631 if (!data->wanted_refs.nr)
1632 return;
1633
1634 packet_writer_write(&data->writer, "wanted-refs\n");
1635
1636 for_each_string_list_item(item, &data->wanted_refs) {
1637 packet_writer_write(&data->writer, "%s %s\n",
1638 oid_to_hex(item->util),
1639 item->string);
1640 }
1641
1642 packet_writer_delim(&data->writer);
1643 }
1644
1645 static void send_shallow_info(struct upload_pack_data *data)
1646 {
1647 /* No shallow info needs to be sent */
1648 if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1649 !is_repository_shallow(the_repository))
1650 return;
1651
1652 packet_writer_write(&data->writer, "shallow-info\n");
1653
1654 if (!send_shallow_list(data) &&
1655 is_repository_shallow(the_repository))
1656 deepen(data, INFINITE_DEPTH);
1657
1658 packet_delim(1);
1659 }
1660
1661 enum fetch_state {
1662 FETCH_PROCESS_ARGS = 0,
1663 FETCH_SEND_ACKS,
1664 FETCH_SEND_PACK,
1665 FETCH_DONE,
1666 };
1667
1668 int upload_pack_v2(struct repository *r, struct packet_reader *request)
1669 {
1670 enum fetch_state state = FETCH_PROCESS_ARGS;
1671 struct upload_pack_data data;
1672
1673 clear_object_flags(ALL_FLAGS);
1674
1675 upload_pack_data_init(&data);
1676 data.use_sideband = LARGE_PACKET_MAX;
1677
1678 git_config(upload_pack_config, &data);
1679
1680 while (state != FETCH_DONE) {
1681 switch (state) {
1682 case FETCH_PROCESS_ARGS:
1683 process_args(request, &data);
1684
1685 if (!data.want_obj.nr && !data.wait_for_done) {
1686 /*
1687 * Request didn't contain any 'want' lines (and
1688 * the request does not contain
1689 * "wait-for-done", in which it is reasonable
1690 * to just send 'have's without 'want's); guess
1691 * they didn't want anything.
1692 */
1693 state = FETCH_DONE;
1694 } else if (data.haves.nr) {
1695 /*
1696 * Request had 'have' lines, so lets ACK them.
1697 */
1698 state = FETCH_SEND_ACKS;
1699 } else {
1700 /*
1701 * Request had 'want's but no 'have's so we can
1702 * immedietly go to construct and send a pack.
1703 */
1704 state = FETCH_SEND_PACK;
1705 }
1706 break;
1707 case FETCH_SEND_ACKS:
1708 if (process_haves_and_send_acks(&data))
1709 state = FETCH_SEND_PACK;
1710 else
1711 state = FETCH_DONE;
1712 break;
1713 case FETCH_SEND_PACK:
1714 send_wanted_ref_info(&data);
1715 send_shallow_info(&data);
1716
1717 if (data.uri_protocols.nr) {
1718 create_pack_file(&data, &data.uri_protocols);
1719 } else {
1720 packet_writer_write(&data.writer, "packfile\n");
1721 create_pack_file(&data, NULL);
1722 }
1723 state = FETCH_DONE;
1724 break;
1725 case FETCH_DONE:
1726 continue;
1727 }
1728 }
1729
1730 upload_pack_data_clear(&data);
1731 return 0;
1732 }
1733
1734 int upload_pack_advertise(struct repository *r,
1735 struct strbuf *value)
1736 {
1737 if (value) {
1738 int allow_filter_value;
1739 int allow_ref_in_want;
1740 int allow_sideband_all_value;
1741 char *str = NULL;
1742
1743 strbuf_addstr(value, "shallow wait-for-done");
1744
1745 if (!repo_config_get_bool(the_repository,
1746 "uploadpack.allowfilter",
1747 &allow_filter_value) &&
1748 allow_filter_value)
1749 strbuf_addstr(value, " filter");
1750
1751 if (!repo_config_get_bool(the_repository,
1752 "uploadpack.allowrefinwant",
1753 &allow_ref_in_want) &&
1754 allow_ref_in_want)
1755 strbuf_addstr(value, " ref-in-want");
1756
1757 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1758 (!repo_config_get_bool(the_repository,
1759 "uploadpack.allowsidebandall",
1760 &allow_sideband_all_value) &&
1761 allow_sideband_all_value))
1762 strbuf_addstr(value, " sideband-all");
1763
1764 if (!repo_config_get_string(the_repository,
1765 "uploadpack.blobpackfileuri",
1766 &str) &&
1767 str) {
1768 strbuf_addstr(value, " packfile-uris");
1769 free(str);
1770 }
1771 }
1772
1773 return 1;
1774 }
Unnamed repository; edit this file 'description' to name the repository.