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Documentation: fix typo
[alt-git.git] / upload-pack.c
blob0b8311bd685f002ffb38672c670372b7e698de95
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 list_objects_filter_init(&data->filter_options);
145
146 data->keepalive = 5;
147 data->advertise_sid = 0;
148 }
149
150 static void upload_pack_data_clear(struct upload_pack_data *data)
151 {
152 string_list_clear(&data->symref, 1);
153 string_list_clear(&data->wanted_refs, 1);
154 object_array_clear(&data->want_obj);
155 object_array_clear(&data->have_obj);
156 oid_array_clear(&data->haves);
157 object_array_clear(&data->shallows);
158 string_list_clear(&data->deepen_not, 0);
159 object_array_clear(&data->extra_edge_obj);
160 list_objects_filter_release(&data->filter_options);
161 string_list_clear(&data->allowed_filters, 0);
162
163 free((char *)data->pack_objects_hook);
164 }
165
166 static void reset_timeout(unsigned int timeout)
167 {
168 alarm(timeout);
169 }
170
171 static void send_client_data(int fd, const char *data, ssize_t sz,
172 int use_sideband)
173 {
174 if (use_sideband) {
175 send_sideband(1, fd, data, sz, use_sideband);
176 return;
177 }
178 if (fd == 3)
179 /* emergency quit */
180 fd = 2;
181 if (fd == 2) {
182 /* XXX: are we happy to lose stuff here? */
183 xwrite(fd, data, sz);
184 return;
185 }
186 write_or_die(fd, data, sz);
187 }
188
189 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
190 {
191 FILE *fp = cb_data;
192 if (graft->nr_parent == -1)
193 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
194 return 0;
195 }
196
197 struct output_state {
198 /*
199 * We do writes no bigger than LARGE_PACKET_DATA_MAX - 1, because with
200 * sideband-64k the band designator takes up 1 byte of space. Because
201 * relay_pack_data keeps the last byte to itself, we make the buffer 1
202 * byte bigger than the intended maximum write size.
203 */
204 char buffer[(LARGE_PACKET_DATA_MAX - 1) + 1];
205 int used;
206 unsigned packfile_uris_started : 1;
207 unsigned packfile_started : 1;
208 };
209
210 static int relay_pack_data(int pack_objects_out, struct output_state *os,
211 int use_sideband, int write_packfile_line)
212 {
213 /*
214 * We keep the last byte to ourselves
215 * in case we detect broken rev-list, so that we
216 * can leave the stream corrupted. This is
217 * unfortunate -- unpack-objects would happily
218 * accept a valid packdata with trailing garbage,
219 * so appending garbage after we pass all the
220 * pack data is not good enough to signal
221 * breakage to downstream.
222 */
223 ssize_t readsz;
224
225 readsz = xread(pack_objects_out, os->buffer + os->used,
226 sizeof(os->buffer) - os->used);
227 if (readsz < 0) {
228 return readsz;
229 }
230 os->used += readsz;
231
232 while (!os->packfile_started) {
233 char *p;
234 if (os->used >= 4 && !memcmp(os->buffer, "PACK", 4)) {
235 os->packfile_started = 1;
236 if (write_packfile_line) {
237 if (os->packfile_uris_started)
238 packet_delim(1);
239 packet_write_fmt(1, "\1packfile\n");
240 }
241 break;
242 }
243 if ((p = memchr(os->buffer, '\n', os->used))) {
244 if (!os->packfile_uris_started) {
245 os->packfile_uris_started = 1;
246 if (!write_packfile_line)
247 BUG("packfile_uris requires sideband-all");
248 packet_write_fmt(1, "\1packfile-uris\n");
249 }
250 *p = '\0';
251 packet_write_fmt(1, "\1%s\n", os->buffer);
252
253 os->used -= p - os->buffer + 1;
254 memmove(os->buffer, p + 1, os->used);
255 } else {
256 /*
257 * Incomplete line.
258 */
259 return readsz;
260 }
261 }
262
263 if (os->used > 1) {
264 send_client_data(1, os->buffer, os->used - 1, use_sideband);
265 os->buffer[0] = os->buffer[os->used - 1];
266 os->used = 1;
267 } else {
268 send_client_data(1, os->buffer, os->used, use_sideband);
269 os->used = 0;
270 }
271
272 return readsz;
273 }
274
275 static void create_pack_file(struct upload_pack_data *pack_data,
276 const struct string_list *uri_protocols)
277 {
278 struct child_process pack_objects = CHILD_PROCESS_INIT;
279 struct output_state *output_state = xcalloc(1, sizeof(struct output_state));
280 char progress[128];
281 char abort_msg[] = "aborting due to possible repository "
282 "corruption on the remote side.";
283 ssize_t sz;
284 int i;
285 FILE *pipe_fd;
286
287 if (!pack_data->pack_objects_hook)
288 pack_objects.git_cmd = 1;
289 else {
290 strvec_push(&pack_objects.args, pack_data->pack_objects_hook);
291 strvec_push(&pack_objects.args, "git");
292 pack_objects.use_shell = 1;
293 }
294
295 if (pack_data->shallow_nr) {
296 strvec_push(&pack_objects.args, "--shallow-file");
297 strvec_push(&pack_objects.args, "");
298 }
299 strvec_push(&pack_objects.args, "pack-objects");
300 strvec_push(&pack_objects.args, "--revs");
301 if (pack_data->use_thin_pack)
302 strvec_push(&pack_objects.args, "--thin");
303
304 strvec_push(&pack_objects.args, "--stdout");
305 if (pack_data->shallow_nr)
306 strvec_push(&pack_objects.args, "--shallow");
307 if (!pack_data->no_progress)
308 strvec_push(&pack_objects.args, "--progress");
309 if (pack_data->use_ofs_delta)
310 strvec_push(&pack_objects.args, "--delta-base-offset");
311 if (pack_data->use_include_tag)
312 strvec_push(&pack_objects.args, "--include-tag");
313 if (pack_data->filter_options.choice) {
314 const char *spec =
315 expand_list_objects_filter_spec(&pack_data->filter_options);
316 strvec_pushf(&pack_objects.args, "--filter=%s", spec);
317 }
318 if (uri_protocols) {
319 for (i = 0; i < uri_protocols->nr; i++)
320 strvec_pushf(&pack_objects.args, "--uri-protocol=%s",
321 uri_protocols->items[i].string);
322 }
323
324 pack_objects.in = -1;
325 pack_objects.out = -1;
326 pack_objects.err = -1;
327 pack_objects.clean_on_exit = 1;
328
329 if (start_command(&pack_objects))
330 die("git upload-pack: unable to fork git-pack-objects");
331
332 pipe_fd = xfdopen(pack_objects.in, "w");
333
334 if (pack_data->shallow_nr)
335 for_each_commit_graft(write_one_shallow, pipe_fd);
336
337 for (i = 0; i < pack_data->want_obj.nr; i++)
338 fprintf(pipe_fd, "%s\n",
339 oid_to_hex(&pack_data->want_obj.objects[i].item->oid));
340 fprintf(pipe_fd, "--not\n");
341 for (i = 0; i < pack_data->have_obj.nr; i++)
342 fprintf(pipe_fd, "%s\n",
343 oid_to_hex(&pack_data->have_obj.objects[i].item->oid));
344 for (i = 0; i < pack_data->extra_edge_obj.nr; i++)
345 fprintf(pipe_fd, "%s\n",
346 oid_to_hex(&pack_data->extra_edge_obj.objects[i].item->oid));
347 fprintf(pipe_fd, "\n");
348 fflush(pipe_fd);
349 fclose(pipe_fd);
350
351 /* We read from pack_objects.err to capture stderr output for
352 * progress bar, and pack_objects.out to capture the pack data.
353 */
354
355 while (1) {
356 struct pollfd pfd[2];
357 int pe, pu, pollsize, polltimeout;
358 int ret;
359
360 reset_timeout(pack_data->timeout);
361
362 pollsize = 0;
363 pe = pu = -1;
364
365 if (0 <= pack_objects.out) {
366 pfd[pollsize].fd = pack_objects.out;
367 pfd[pollsize].events = POLLIN;
368 pu = pollsize;
369 pollsize++;
370 }
371 if (0 <= pack_objects.err) {
372 pfd[pollsize].fd = pack_objects.err;
373 pfd[pollsize].events = POLLIN;
374 pe = pollsize;
375 pollsize++;
376 }
377
378 if (!pollsize)
379 break;
380
381 polltimeout = pack_data->keepalive < 0
382 ? -1
383 : 1000 * pack_data->keepalive;
384
385 ret = poll(pfd, pollsize, polltimeout);
386
387 if (ret < 0) {
388 if (errno != EINTR) {
389 error_errno("poll failed, resuming");
390 sleep(1);
391 }
392 continue;
393 }
394 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
395 /* Status ready; we ship that in the side-band
396 * or dump to the standard error.
397 */
398 sz = xread(pack_objects.err, progress,
399 sizeof(progress));
400 if (0 < sz)
401 send_client_data(2, progress, sz,
402 pack_data->use_sideband);
403 else if (sz == 0) {
404 close(pack_objects.err);
405 pack_objects.err = -1;
406 }
407 else
408 goto fail;
409 /* give priority to status messages */
410 continue;
411 }
412 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
413 int result = relay_pack_data(pack_objects.out,
414 output_state,
415 pack_data->use_sideband,
416 !!uri_protocols);
417
418 if (result == 0) {
419 close(pack_objects.out);
420 pack_objects.out = -1;
421 } else if (result < 0) {
422 goto fail;
423 }
424 }
425
426 /*
427 * We hit the keepalive timeout without saying anything; send
428 * an empty message on the data sideband just to let the other
429 * side know we're still working on it, but don't have any data
430 * yet.
431 *
432 * If we don't have a sideband channel, there's no room in the
433 * protocol to say anything, so those clients are just out of
434 * luck.
435 */
436 if (!ret && pack_data->use_sideband) {
437 static const char buf[] = "0005\1";
438 write_or_die(1, buf, 5);
439 }
440 }
441
442 if (finish_command(&pack_objects)) {
443 error("git upload-pack: git-pack-objects died with error.");
444 goto fail;
445 }
446
447 /* flush the data */
448 if (output_state->used > 0) {
449 send_client_data(1, output_state->buffer, output_state->used,
450 pack_data->use_sideband);
451 fprintf(stderr, "flushed.\n");
452 }
453 free(output_state);
454 if (pack_data->use_sideband)
455 packet_flush(1);
456 return;
457
458 fail:
459 free(output_state);
460 send_client_data(3, abort_msg, sizeof(abort_msg),
461 pack_data->use_sideband);
462 die("git upload-pack: %s", abort_msg);
463 }
464
465 static int do_got_oid(struct upload_pack_data *data, const struct object_id *oid)
466 {
467 int we_knew_they_have = 0;
468 struct object *o = parse_object(the_repository, oid);
469
470 if (!o)
471 die("oops (%s)", oid_to_hex(oid));
472 if (o->type == OBJ_COMMIT) {
473 struct commit_list *parents;
474 struct commit *commit = (struct commit *)o;
475 if (o->flags & THEY_HAVE)
476 we_knew_they_have = 1;
477 else
478 o->flags |= THEY_HAVE;
479 if (!data->oldest_have || (commit->date < data->oldest_have))
480 data->oldest_have = commit->date;
481 for (parents = commit->parents;
482 parents;
483 parents = parents->next)
484 parents->item->object.flags |= THEY_HAVE;
485 }
486 if (!we_knew_they_have) {
487 add_object_array(o, NULL, &data->have_obj);
488 return 1;
489 }
490 return 0;
491 }
492
493 static int got_oid(struct upload_pack_data *data,
494 const char *hex, struct object_id *oid)
495 {
496 if (get_oid_hex(hex, oid))
497 die("git upload-pack: expected SHA1 object, got '%s'", hex);
498 if (!has_object_file_with_flags(oid,
499 OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
500 return -1;
501 return do_got_oid(data, oid);
502 }
503
504 static int ok_to_give_up(struct upload_pack_data *data)
505 {
506 timestamp_t min_generation = GENERATION_NUMBER_ZERO;
507
508 if (!data->have_obj.nr)
509 return 0;
510
511 return can_all_from_reach_with_flag(&data->want_obj, THEY_HAVE,
512 COMMON_KNOWN, data->oldest_have,
513 min_generation);
514 }
515
516 static int get_common_commits(struct upload_pack_data *data,
517 struct packet_reader *reader)
518 {
519 struct object_id oid;
520 char last_hex[GIT_MAX_HEXSZ + 1];
521 int got_common = 0;
522 int got_other = 0;
523 int sent_ready = 0;
524
525 save_commit_buffer = 0;
526
527 for (;;) {
528 const char *arg;
529
530 reset_timeout(data->timeout);
531
532 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
533 if (data->multi_ack == MULTI_ACK_DETAILED
534 && got_common
535 && !got_other
536 && ok_to_give_up(data)) {
537 sent_ready = 1;
538 packet_write_fmt(1, "ACK %s ready\n", last_hex);
539 }
540 if (data->have_obj.nr == 0 || data->multi_ack)
541 packet_write_fmt(1, "NAK\n");
542
543 if (data->no_done && sent_ready) {
544 packet_write_fmt(1, "ACK %s\n", last_hex);
545 return 0;
546 }
547 if (data->stateless_rpc)
548 exit(0);
549 got_common = 0;
550 got_other = 0;
551 continue;
552 }
553 if (skip_prefix(reader->line, "have ", &arg)) {
554 switch (got_oid(data, arg, &oid)) {
555 case -1: /* they have what we do not */
556 got_other = 1;
557 if (data->multi_ack
558 && ok_to_give_up(data)) {
559 const char *hex = oid_to_hex(&oid);
560 if (data->multi_ack == MULTI_ACK_DETAILED) {
561 sent_ready = 1;
562 packet_write_fmt(1, "ACK %s ready\n", hex);
563 } else
564 packet_write_fmt(1, "ACK %s continue\n", hex);
565 }
566 break;
567 default:
568 got_common = 1;
569 oid_to_hex_r(last_hex, &oid);
570 if (data->multi_ack == MULTI_ACK_DETAILED)
571 packet_write_fmt(1, "ACK %s common\n", last_hex);
572 else if (data->multi_ack)
573 packet_write_fmt(1, "ACK %s continue\n", last_hex);
574 else if (data->have_obj.nr == 1)
575 packet_write_fmt(1, "ACK %s\n", last_hex);
576 break;
577 }
578 continue;
579 }
580 if (!strcmp(reader->line, "done")) {
581 if (data->have_obj.nr > 0) {
582 if (data->multi_ack)
583 packet_write_fmt(1, "ACK %s\n", last_hex);
584 return 0;
585 }
586 packet_write_fmt(1, "NAK\n");
587 return -1;
588 }
589 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
590 }
591 }
592
593 static int is_our_ref(struct object *o, enum allow_uor allow_uor)
594 {
595 int allow_hidden_ref = (allow_uor &
596 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
597 return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
598 }
599
600 /*
601 * on successful case, it's up to the caller to close cmd->out
602 */
603 static int do_reachable_revlist(struct child_process *cmd,
604 struct object_array *src,
605 struct object_array *reachable,
606 enum allow_uor allow_uor)
607 {
608 struct object *o;
609 FILE *cmd_in = NULL;
610 int i;
611
612 strvec_pushl(&cmd->args, "rev-list", "--stdin", NULL);
613 cmd->git_cmd = 1;
614 cmd->no_stderr = 1;
615 cmd->in = -1;
616 cmd->out = -1;
617
618 /*
619 * If the next rev-list --stdin encounters an unknown commit,
620 * it terminates, which will cause SIGPIPE in the write loop
621 * below.
622 */
623 sigchain_push(SIGPIPE, SIG_IGN);
624
625 if (start_command(cmd))
626 goto error;
627
628 cmd_in = xfdopen(cmd->in, "w");
629
630 for (i = get_max_object_index(); 0 < i; ) {
631 o = get_indexed_object(--i);
632 if (!o)
633 continue;
634 if (reachable && o->type == OBJ_COMMIT)
635 o->flags &= ~TMP_MARK;
636 if (!is_our_ref(o, allow_uor))
637 continue;
638 if (fprintf(cmd_in, "^%s\n", oid_to_hex(&o->oid)) < 0)
639 goto error;
640 }
641 for (i = 0; i < src->nr; i++) {
642 o = src->objects[i].item;
643 if (is_our_ref(o, allow_uor)) {
644 if (reachable)
645 add_object_array(o, NULL, reachable);
646 continue;
647 }
648 if (reachable && o->type == OBJ_COMMIT)
649 o->flags |= TMP_MARK;
650 if (fprintf(cmd_in, "%s\n", oid_to_hex(&o->oid)) < 0)
651 goto error;
652 }
653 if (ferror(cmd_in) || fflush(cmd_in))
654 goto error;
655 fclose(cmd_in);
656 cmd->in = -1;
657 sigchain_pop(SIGPIPE);
658
659 return 0;
660
661 error:
662 sigchain_pop(SIGPIPE);
663
664 if (cmd_in)
665 fclose(cmd_in);
666 if (cmd->out >= 0)
667 close(cmd->out);
668 return -1;
669 }
670
671 static int get_reachable_list(struct upload_pack_data *data,
672 struct object_array *reachable)
673 {
674 struct child_process cmd = CHILD_PROCESS_INIT;
675 int i;
676 struct object *o;
677 char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
678 const unsigned hexsz = the_hash_algo->hexsz;
679
680 if (do_reachable_revlist(&cmd, &data->shallows, reachable,
681 data->allow_uor) < 0)
682 return -1;
683
684 while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
685 struct object_id oid;
686 const char *p;
687
688 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
689 break;
690
691 o = lookup_object(the_repository, &oid);
692 if (o && o->type == OBJ_COMMIT) {
693 o->flags &= ~TMP_MARK;
694 }
695 }
696 for (i = get_max_object_index(); 0 < i; i--) {
697 o = get_indexed_object(i - 1);
698 if (o && o->type == OBJ_COMMIT &&
699 (o->flags & TMP_MARK)) {
700 add_object_array(o, NULL, reachable);
701 o->flags &= ~TMP_MARK;
702 }
703 }
704 close(cmd.out);
705
706 if (finish_command(&cmd))
707 return -1;
708
709 return 0;
710 }
711
712 static int has_unreachable(struct object_array *src, enum allow_uor allow_uor)
713 {
714 struct child_process cmd = CHILD_PROCESS_INIT;
715 char buf[1];
716 int i;
717
718 if (do_reachable_revlist(&cmd, src, NULL, allow_uor) < 0)
719 return 1;
720
721 /*
722 * The commits out of the rev-list are not ancestors of
723 * our ref.
724 */
725 i = read_in_full(cmd.out, buf, 1);
726 if (i)
727 goto error;
728 close(cmd.out);
729 cmd.out = -1;
730
731 /*
732 * rev-list may have died by encountering a bad commit
733 * in the history, in which case we do want to bail out
734 * even when it showed no commit.
735 */
736 if (finish_command(&cmd))
737 goto error;
738
739 /* All the non-tip ones are ancestors of what we advertised */
740 return 0;
741
742 error:
743 if (cmd.out >= 0)
744 close(cmd.out);
745 return 1;
746 }
747
748 static void check_non_tip(struct upload_pack_data *data)
749 {
750 int i;
751
752 /*
753 * In the normal in-process case without
754 * uploadpack.allowReachableSHA1InWant,
755 * non-tip requests can never happen.
756 */
757 if (!data->stateless_rpc && !(data->allow_uor & ALLOW_REACHABLE_SHA1))
758 goto error;
759 if (!has_unreachable(&data->want_obj, data->allow_uor))
760 /* All the non-tip ones are ancestors of what we advertised */
761 return;
762
763 error:
764 /* Pick one of them (we know there at least is one) */
765 for (i = 0; i < data->want_obj.nr; i++) {
766 struct object *o = data->want_obj.objects[i].item;
767 if (!is_our_ref(o, data->allow_uor)) {
768 packet_writer_error(&data->writer,
769 "upload-pack: not our ref %s",
770 oid_to_hex(&o->oid));
771 die("git upload-pack: not our ref %s",
772 oid_to_hex(&o->oid));
773 }
774 }
775 }
776
777 static void send_shallow(struct upload_pack_data *data,
778 struct commit_list *result)
779 {
780 while (result) {
781 struct object *object = &result->item->object;
782 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
783 packet_writer_write(&data->writer, "shallow %s",
784 oid_to_hex(&object->oid));
785 register_shallow(the_repository, &object->oid);
786 data->shallow_nr++;
787 }
788 result = result->next;
789 }
790 }
791
792 static void send_unshallow(struct upload_pack_data *data)
793 {
794 int i;
795
796 for (i = 0; i < data->shallows.nr; i++) {
797 struct object *object = data->shallows.objects[i].item;
798 if (object->flags & NOT_SHALLOW) {
799 struct commit_list *parents;
800 packet_writer_write(&data->writer, "unshallow %s",
801 oid_to_hex(&object->oid));
802 object->flags &= ~CLIENT_SHALLOW;
803 /*
804 * We want to _register_ "object" as shallow, but we
805 * also need to traverse object's parents to deepen a
806 * shallow clone. Unregister it for now so we can
807 * parse and add the parents to the want list, then
808 * re-register it.
809 */
810 unregister_shallow(&object->oid);
811 object->parsed = 0;
812 parse_commit_or_die((struct commit *)object);
813 parents = ((struct commit *)object)->parents;
814 while (parents) {
815 add_object_array(&parents->item->object,
816 NULL, &data->want_obj);
817 parents = parents->next;
818 }
819 add_object_array(object, NULL, &data->extra_edge_obj);
820 }
821 /* make sure commit traversal conforms to client */
822 register_shallow(the_repository, &object->oid);
823 }
824 }
825
826 static int check_ref(const char *refname_full, const struct object_id *oid,
827 int flag, void *cb_data);
828 static void deepen(struct upload_pack_data *data, int depth)
829 {
830 if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
831 int i;
832
833 for (i = 0; i < data->shallows.nr; i++) {
834 struct object *object = data->shallows.objects[i].item;
835 object->flags |= NOT_SHALLOW;
836 }
837 } else if (data->deepen_relative) {
838 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
839 struct commit_list *result;
840
841 /*
842 * Checking for reachable shallows requires that our refs be
843 * marked with OUR_REF.
844 */
845 head_ref_namespaced(check_ref, NULL);
846 for_each_namespaced_ref(check_ref, NULL);
847
848 get_reachable_list(data, &reachable_shallows);
849 result = get_shallow_commits(&reachable_shallows,
850 depth + 1,
851 SHALLOW, NOT_SHALLOW);
852 send_shallow(data, result);
853 free_commit_list(result);
854 object_array_clear(&reachable_shallows);
855 } else {
856 struct commit_list *result;
857
858 result = get_shallow_commits(&data->want_obj, depth,
859 SHALLOW, NOT_SHALLOW);
860 send_shallow(data, result);
861 free_commit_list(result);
862 }
863
864 send_unshallow(data);
865 }
866
867 static void deepen_by_rev_list(struct upload_pack_data *data,
868 int ac,
869 const char **av)
870 {
871 struct commit_list *result;
872
873 disable_commit_graph(the_repository);
874 result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
875 send_shallow(data, result);
876 free_commit_list(result);
877 send_unshallow(data);
878 }
879
880 /* Returns 1 if a shallow list is sent or 0 otherwise */
881 static int send_shallow_list(struct upload_pack_data *data)
882 {
883 int ret = 0;
884
885 if (data->depth > 0 && data->deepen_rev_list)
886 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
887 if (data->depth > 0) {
888 deepen(data, data->depth);
889 ret = 1;
890 } else if (data->deepen_rev_list) {
891 struct strvec av = STRVEC_INIT;
892 int i;
893
894 strvec_push(&av, "rev-list");
895 if (data->deepen_since)
896 strvec_pushf(&av, "--max-age=%"PRItime, data->deepen_since);
897 if (data->deepen_not.nr) {
898 strvec_push(&av, "--not");
899 for (i = 0; i < data->deepen_not.nr; i++) {
900 struct string_list_item *s = data->deepen_not.items + i;
901 strvec_push(&av, s->string);
902 }
903 strvec_push(&av, "--not");
904 }
905 for (i = 0; i < data->want_obj.nr; i++) {
906 struct object *o = data->want_obj.objects[i].item;
907 strvec_push(&av, oid_to_hex(&o->oid));
908 }
909 deepen_by_rev_list(data, av.nr, av.v);
910 strvec_clear(&av);
911 ret = 1;
912 } else {
913 if (data->shallows.nr > 0) {
914 int i;
915 for (i = 0; i < data->shallows.nr; i++)
916 register_shallow(the_repository,
917 &data->shallows.objects[i].item->oid);
918 }
919 }
920
921 data->shallow_nr += data->shallows.nr;
922 return ret;
923 }
924
925 static int process_shallow(const char *line, struct object_array *shallows)
926 {
927 const char *arg;
928 if (skip_prefix(line, "shallow ", &arg)) {
929 struct object_id oid;
930 struct object *object;
931 if (get_oid_hex(arg, &oid))
932 die("invalid shallow line: %s", line);
933 object = parse_object(the_repository, &oid);
934 if (!object)
935 return 1;
936 if (object->type != OBJ_COMMIT)
937 die("invalid shallow object %s", oid_to_hex(&oid));
938 if (!(object->flags & CLIENT_SHALLOW)) {
939 object->flags |= CLIENT_SHALLOW;
940 add_object_array(object, NULL, shallows);
941 }
942 return 1;
943 }
944
945 return 0;
946 }
947
948 static int process_deepen(const char *line, int *depth)
949 {
950 const char *arg;
951 if (skip_prefix(line, "deepen ", &arg)) {
952 char *end = NULL;
953 *depth = (int)strtol(arg, &end, 0);
954 if (!end || *end || *depth <= 0)
955 die("Invalid deepen: %s", line);
956 return 1;
957 }
958
959 return 0;
960 }
961
962 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
963 {
964 const char *arg;
965 if (skip_prefix(line, "deepen-since ", &arg)) {
966 char *end = NULL;
967 *deepen_since = parse_timestamp(arg, &end, 0);
968 if (!end || *end || !deepen_since ||
969 /* revisions.c's max_age -1 is special */
970 *deepen_since == -1)
971 die("Invalid deepen-since: %s", line);
972 *deepen_rev_list = 1;
973 return 1;
974 }
975 return 0;
976 }
977
978 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
979 {
980 const char *arg;
981 if (skip_prefix(line, "deepen-not ", &arg)) {
982 char *ref = NULL;
983 struct object_id oid;
984 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
985 die("git upload-pack: ambiguous deepen-not: %s", line);
986 string_list_append(deepen_not, ref);
987 free(ref);
988 *deepen_rev_list = 1;
989 return 1;
990 }
991 return 0;
992 }
993
994 NORETURN __attribute__((format(printf,2,3)))
995 static void send_err_and_die(struct upload_pack_data *data,
996 const char *fmt, ...)
997 {
998 struct strbuf buf = STRBUF_INIT;
999 va_list ap;
1000
1001 va_start(ap, fmt);
1002 strbuf_vaddf(&buf, fmt, ap);
1003 va_end(ap);
1004
1005 packet_writer_error(&data->writer, "%s", buf.buf);
1006 die("%s", buf.buf);
1007 }
1008
1009 static void check_one_filter(struct upload_pack_data *data,
1010 struct list_objects_filter_options *opts)
1011 {
1012 const char *key = list_object_filter_config_name(opts->choice);
1013 struct string_list_item *item = string_list_lookup(&data->allowed_filters,
1014 key);
1015 int allowed;
1016
1017 if (item)
1018 allowed = (intptr_t)item->util;
1019 else
1020 allowed = data->allow_filter_fallback;
1021
1022 if (!allowed)
1023 send_err_and_die(data, "filter '%s' not supported", key);
1024
1025 if (opts->choice == LOFC_TREE_DEPTH &&
1026 opts->tree_exclude_depth > data->tree_filter_max_depth)
1027 send_err_and_die(data,
1028 "tree filter allows max depth %lu, but got %lu",
1029 data->tree_filter_max_depth,
1030 opts->tree_exclude_depth);
1031 }
1032
1033 static void check_filter_recurse(struct upload_pack_data *data,
1034 struct list_objects_filter_options *opts)
1035 {
1036 size_t i;
1037
1038 check_one_filter(data, opts);
1039 if (opts->choice != LOFC_COMBINE)
1040 return;
1041
1042 for (i = 0; i < opts->sub_nr; i++)
1043 check_filter_recurse(data, &opts->sub[i]);
1044 }
1045
1046 static void die_if_using_banned_filter(struct upload_pack_data *data)
1047 {
1048 check_filter_recurse(data, &data->filter_options);
1049 }
1050
1051 static void receive_needs(struct upload_pack_data *data,
1052 struct packet_reader *reader)
1053 {
1054 int has_non_tip = 0;
1055
1056 data->shallow_nr = 0;
1057 for (;;) {
1058 struct object *o;
1059 const char *features;
1060 struct object_id oid_buf;
1061 const char *arg;
1062 int feature_len;
1063
1064 reset_timeout(data->timeout);
1065 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
1066 break;
1067
1068 if (process_shallow(reader->line, &data->shallows))
1069 continue;
1070 if (process_deepen(reader->line, &data->depth))
1071 continue;
1072 if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
1073 continue;
1074 if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
1075 continue;
1076
1077 if (skip_prefix(reader->line, "filter ", &arg)) {
1078 if (!data->filter_capability_requested)
1079 die("git upload-pack: filtering capability not negotiated");
1080 list_objects_filter_die_if_populated(&data->filter_options);
1081 parse_list_objects_filter(&data->filter_options, arg);
1082 die_if_using_banned_filter(data);
1083 continue;
1084 }
1085
1086 if (!skip_prefix(reader->line, "want ", &arg) ||
1087 parse_oid_hex(arg, &oid_buf, &features))
1088 die("git upload-pack: protocol error, "
1089 "expected to get object ID, not '%s'", reader->line);
1090
1091 if (parse_feature_request(features, "deepen-relative"))
1092 data->deepen_relative = 1;
1093 if (parse_feature_request(features, "multi_ack_detailed"))
1094 data->multi_ack = MULTI_ACK_DETAILED;
1095 else if (parse_feature_request(features, "multi_ack"))
1096 data->multi_ack = MULTI_ACK;
1097 if (parse_feature_request(features, "no-done"))
1098 data->no_done = 1;
1099 if (parse_feature_request(features, "thin-pack"))
1100 data->use_thin_pack = 1;
1101 if (parse_feature_request(features, "ofs-delta"))
1102 data->use_ofs_delta = 1;
1103 if (parse_feature_request(features, "side-band-64k"))
1104 data->use_sideband = LARGE_PACKET_MAX;
1105 else if (parse_feature_request(features, "side-band"))
1106 data->use_sideband = DEFAULT_PACKET_MAX;
1107 if (parse_feature_request(features, "no-progress"))
1108 data->no_progress = 1;
1109 if (parse_feature_request(features, "include-tag"))
1110 data->use_include_tag = 1;
1111 if (data->allow_filter &&
1112 parse_feature_request(features, "filter"))
1113 data->filter_capability_requested = 1;
1114
1115 arg = parse_feature_value(features, "session-id", &feature_len, NULL);
1116 if (arg) {
1117 char *client_sid = xstrndup(arg, feature_len);
1118 trace2_data_string("transfer", NULL, "client-sid", client_sid);
1119 free(client_sid);
1120 }
1121
1122 o = parse_object(the_repository, &oid_buf);
1123 if (!o) {
1124 packet_writer_error(&data->writer,
1125 "upload-pack: not our ref %s",
1126 oid_to_hex(&oid_buf));
1127 die("git upload-pack: not our ref %s",
1128 oid_to_hex(&oid_buf));
1129 }
1130 if (!(o->flags & WANTED)) {
1131 o->flags |= WANTED;
1132 if (!((data->allow_uor & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
1133 || is_our_ref(o, data->allow_uor)))
1134 has_non_tip = 1;
1135 add_object_array(o, NULL, &data->want_obj);
1136 }
1137 }
1138
1139 /*
1140 * We have sent all our refs already, and the other end
1141 * should have chosen out of them. When we are operating
1142 * in the stateless RPC mode, however, their choice may
1143 * have been based on the set of older refs advertised
1144 * by another process that handled the initial request.
1145 */
1146 if (has_non_tip)
1147 check_non_tip(data);
1148
1149 if (!data->use_sideband && data->daemon_mode)
1150 data->no_progress = 1;
1151
1152 if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1153 return;
1154
1155 if (send_shallow_list(data))
1156 packet_flush(1);
1157 }
1158
1159 /* return non-zero if the ref is hidden, otherwise 0 */
1160 static int mark_our_ref(const char *refname, const char *refname_full,
1161 const struct object_id *oid)
1162 {
1163 struct object *o = lookup_unknown_object(the_repository, oid);
1164
1165 if (ref_is_hidden(refname, refname_full)) {
1166 o->flags |= HIDDEN_REF;
1167 return 1;
1168 }
1169 o->flags |= OUR_REF;
1170 return 0;
1171 }
1172
1173 static int check_ref(const char *refname_full, const struct object_id *oid,
1174 int flag UNUSED, void *cb_data UNUSED)
1175 {
1176 const char *refname = strip_namespace(refname_full);
1177
1178 mark_our_ref(refname, refname_full, oid);
1179 return 0;
1180 }
1181
1182 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1183 {
1184 struct string_list_item *item;
1185
1186 if (!symref->nr)
1187 return;
1188 for_each_string_list_item(item, symref)
1189 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1190 }
1191
1192 static void format_session_id(struct strbuf *buf, struct upload_pack_data *d) {
1193 if (d->advertise_sid)
1194 strbuf_addf(buf, " session-id=%s", trace2_session_id());
1195 }
1196
1197 static int send_ref(const char *refname, const struct object_id *oid,
1198 int flag UNUSED, void *cb_data)
1199 {
1200 static const char *capabilities = "multi_ack thin-pack side-band"
1201 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1202 " deepen-relative no-progress include-tag multi_ack_detailed";
1203 const char *refname_nons = strip_namespace(refname);
1204 struct object_id peeled;
1205 struct upload_pack_data *data = cb_data;
1206
1207 if (mark_our_ref(refname_nons, refname, oid))
1208 return 0;
1209
1210 if (capabilities) {
1211 struct strbuf symref_info = STRBUF_INIT;
1212 struct strbuf session_id = STRBUF_INIT;
1213
1214 format_symref_info(&symref_info, &data->symref);
1215 format_session_id(&session_id, data);
1216 packet_fwrite_fmt(stdout, "%s %s%c%s%s%s%s%s%s%s object-format=%s agent=%s\n",
1217 oid_to_hex(oid), refname_nons,
1218 0, capabilities,
1219 (data->allow_uor & ALLOW_TIP_SHA1) ?
1220 " allow-tip-sha1-in-want" : "",
1221 (data->allow_uor & ALLOW_REACHABLE_SHA1) ?
1222 " allow-reachable-sha1-in-want" : "",
1223 data->no_done ? " no-done" : "",
1224 symref_info.buf,
1225 data->allow_filter ? " filter" : "",
1226 session_id.buf,
1227 the_hash_algo->name,
1228 git_user_agent_sanitized());
1229 strbuf_release(&symref_info);
1230 strbuf_release(&session_id);
1231 } else {
1232 packet_fwrite_fmt(stdout, "%s %s\n", oid_to_hex(oid), refname_nons);
1233 }
1234 capabilities = NULL;
1235 if (!peel_iterated_oid(oid, &peeled))
1236 packet_fwrite_fmt(stdout, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1237 return 0;
1238 }
1239
1240 static int find_symref(const char *refname,
1241 const struct object_id *oid UNUSED,
1242 int flag, void *cb_data)
1243 {
1244 const char *symref_target;
1245 struct string_list_item *item;
1246
1247 if ((flag & REF_ISSYMREF) == 0)
1248 return 0;
1249 symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1250 if (!symref_target || (flag & REF_ISSYMREF) == 0)
1251 die("'%s' is a symref but it is not?", refname);
1252 item = string_list_append(cb_data, strip_namespace(refname));
1253 item->util = xstrdup(strip_namespace(symref_target));
1254 return 0;
1255 }
1256
1257 static int parse_object_filter_config(const char *var, const char *value,
1258 struct upload_pack_data *data)
1259 {
1260 struct strbuf buf = STRBUF_INIT;
1261 const char *sub, *key;
1262 size_t sub_len;
1263
1264 if (parse_config_key(var, "uploadpackfilter", &sub, &sub_len, &key))
1265 return 0;
1266
1267 if (!sub) {
1268 if (!strcmp(key, "allow"))
1269 data->allow_filter_fallback = git_config_bool(var, value);
1270 return 0;
1271 }
1272
1273 strbuf_add(&buf, sub, sub_len);
1274
1275 if (!strcmp(key, "allow"))
1276 string_list_insert(&data->allowed_filters, buf.buf)->util =
1277 (void *)(intptr_t)git_config_bool(var, value);
1278 else if (!strcmp(buf.buf, "tree") && !strcmp(key, "maxdepth")) {
1279 if (!value) {
1280 strbuf_release(&buf);
1281 return config_error_nonbool(var);
1282 }
1283 string_list_insert(&data->allowed_filters, buf.buf)->util =
1284 (void *)(intptr_t)1;
1285 data->tree_filter_max_depth = git_config_ulong(var, value);
1286 }
1287
1288 strbuf_release(&buf);
1289 return 0;
1290 }
1291
1292 static int upload_pack_config(const char *var, const char *value, void *cb_data)
1293 {
1294 struct upload_pack_data *data = cb_data;
1295
1296 if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1297 if (git_config_bool(var, value))
1298 data->allow_uor |= ALLOW_TIP_SHA1;
1299 else
1300 data->allow_uor &= ~ALLOW_TIP_SHA1;
1301 } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1302 if (git_config_bool(var, value))
1303 data->allow_uor |= ALLOW_REACHABLE_SHA1;
1304 else
1305 data->allow_uor &= ~ALLOW_REACHABLE_SHA1;
1306 } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1307 if (git_config_bool(var, value))
1308 data->allow_uor |= ALLOW_ANY_SHA1;
1309 else
1310 data->allow_uor &= ~ALLOW_ANY_SHA1;
1311 } else if (!strcmp("uploadpack.keepalive", var)) {
1312 data->keepalive = git_config_int(var, value);
1313 if (!data->keepalive)
1314 data->keepalive = -1;
1315 } else if (!strcmp("uploadpack.allowfilter", var)) {
1316 data->allow_filter = git_config_bool(var, value);
1317 } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1318 data->allow_ref_in_want = git_config_bool(var, value);
1319 } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1320 data->allow_sideband_all = git_config_bool(var, value);
1321 } else if (!strcmp("core.precomposeunicode", var)) {
1322 precomposed_unicode = git_config_bool(var, value);
1323 } else if (!strcmp("transfer.advertisesid", var)) {
1324 data->advertise_sid = git_config_bool(var, value);
1325 }
1326
1327 if (parse_object_filter_config(var, value, data) < 0)
1328 return -1;
1329
1330 return parse_hide_refs_config(var, value, "uploadpack");
1331 }
1332
1333 static int upload_pack_protected_config(const char *var, const char *value, void *cb_data)
1334 {
1335 struct upload_pack_data *data = cb_data;
1336
1337 if (!strcmp("uploadpack.packobjectshook", var))
1338 return git_config_string(&data->pack_objects_hook, var, value);
1339 return 0;
1340 }
1341
1342 static void get_upload_pack_config(struct upload_pack_data *data)
1343 {
1344 git_config(upload_pack_config, data);
1345 git_protected_config(upload_pack_protected_config, data);
1346 }
1347
1348 void upload_pack(const int advertise_refs, const int stateless_rpc,
1349 const int timeout)
1350 {
1351 struct packet_reader reader;
1352 struct upload_pack_data data;
1353
1354 upload_pack_data_init(&data);
1355 get_upload_pack_config(&data);
1356
1357 data.stateless_rpc = stateless_rpc;
1358 data.timeout = timeout;
1359 if (data.timeout)
1360 data.daemon_mode = 1;
1361
1362 head_ref_namespaced(find_symref, &data.symref);
1363
1364 if (advertise_refs || !data.stateless_rpc) {
1365 reset_timeout(data.timeout);
1366 if (advertise_refs)
1367 data.no_done = 1;
1368 head_ref_namespaced(send_ref, &data);
1369 for_each_namespaced_ref(send_ref, &data);
1370 /*
1371 * fflush stdout before calling advertise_shallow_grafts because send_ref
1372 * uses stdio.
1373 */
1374 fflush_or_die(stdout);
1375 advertise_shallow_grafts(1);
1376 packet_flush(1);
1377 } else {
1378 head_ref_namespaced(check_ref, NULL);
1379 for_each_namespaced_ref(check_ref, NULL);
1380 }
1381
1382 if (!advertise_refs) {
1383 packet_reader_init(&reader, 0, NULL, 0,
1384 PACKET_READ_CHOMP_NEWLINE |
1385 PACKET_READ_DIE_ON_ERR_PACKET);
1386
1387 receive_needs(&data, &reader);
1388
1389 /*
1390 * An EOF at this exact point in negotiation should be
1391 * acceptable from stateless clients as they will consume the
1392 * shallow list before doing subsequent rpc with haves/etc.
1393 */
1394 if (data.stateless_rpc)
1395 reader.options |= PACKET_READ_GENTLE_ON_EOF;
1396
1397 if (data.want_obj.nr &&
1398 packet_reader_peek(&reader) != PACKET_READ_EOF) {
1399 reader.options &= ~PACKET_READ_GENTLE_ON_EOF;
1400 get_common_commits(&data, &reader);
1401 create_pack_file(&data, NULL);
1402 }
1403 }
1404
1405 upload_pack_data_clear(&data);
1406 }
1407
1408 static int parse_want(struct packet_writer *writer, const char *line,
1409 struct object_array *want_obj)
1410 {
1411 const char *arg;
1412 if (skip_prefix(line, "want ", &arg)) {
1413 struct object_id oid;
1414 struct object *o;
1415
1416 if (get_oid_hex(arg, &oid))
1417 die("git upload-pack: protocol error, "
1418 "expected to get oid, not '%s'", line);
1419
1420 o = parse_object_with_flags(the_repository, &oid,
1421 PARSE_OBJECT_SKIP_HASH_CHECK);
1422
1423 if (!o) {
1424 packet_writer_error(writer,
1425 "upload-pack: not our ref %s",
1426 oid_to_hex(&oid));
1427 die("git upload-pack: not our ref %s",
1428 oid_to_hex(&oid));
1429 }
1430
1431 if (!(o->flags & WANTED)) {
1432 o->flags |= WANTED;
1433 add_object_array(o, NULL, want_obj);
1434 }
1435
1436 return 1;
1437 }
1438
1439 return 0;
1440 }
1441
1442 static int parse_want_ref(struct packet_writer *writer, const char *line,
1443 struct string_list *wanted_refs,
1444 struct object_array *want_obj)
1445 {
1446 const char *refname_nons;
1447 if (skip_prefix(line, "want-ref ", &refname_nons)) {
1448 struct object_id oid;
1449 struct string_list_item *item;
1450 struct object *o = NULL;
1451 struct strbuf refname = STRBUF_INIT;
1452
1453 strbuf_addf(&refname, "%s%s", get_git_namespace(), refname_nons);
1454 if (ref_is_hidden(refname_nons, refname.buf) ||
1455 read_ref(refname.buf, &oid)) {
1456 packet_writer_error(writer, "unknown ref %s", refname_nons);
1457 die("unknown ref %s", refname_nons);
1458 }
1459 strbuf_release(&refname);
1460
1461 item = string_list_append(wanted_refs, refname_nons);
1462 item->util = oiddup(&oid);
1463
1464 if (!starts_with(refname_nons, "refs/tags/")) {
1465 struct commit *commit = lookup_commit_in_graph(the_repository, &oid);
1466 if (commit)
1467 o = &commit->object;
1468 }
1469
1470 if (!o)
1471 o = parse_object_or_die(&oid, refname_nons);
1472
1473 if (!(o->flags & WANTED)) {
1474 o->flags |= WANTED;
1475 add_object_array(o, NULL, want_obj);
1476 }
1477
1478 return 1;
1479 }
1480
1481 return 0;
1482 }
1483
1484 static int parse_have(const char *line, struct oid_array *haves)
1485 {
1486 const char *arg;
1487 if (skip_prefix(line, "have ", &arg)) {
1488 struct object_id oid;
1489
1490 if (get_oid_hex(arg, &oid))
1491 die("git upload-pack: expected SHA1 object, got '%s'", arg);
1492 oid_array_append(haves, &oid);
1493 return 1;
1494 }
1495
1496 return 0;
1497 }
1498
1499 static void process_args(struct packet_reader *request,
1500 struct upload_pack_data *data)
1501 {
1502 while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1503 const char *arg = request->line;
1504 const char *p;
1505
1506 /* process want */
1507 if (parse_want(&data->writer, arg, &data->want_obj))
1508 continue;
1509 if (data->allow_ref_in_want &&
1510 parse_want_ref(&data->writer, arg, &data->wanted_refs,
1511 &data->want_obj))
1512 continue;
1513 /* process have line */
1514 if (parse_have(arg, &data->haves))
1515 continue;
1516
1517 /* process args like thin-pack */
1518 if (!strcmp(arg, "thin-pack")) {
1519 data->use_thin_pack = 1;
1520 continue;
1521 }
1522 if (!strcmp(arg, "ofs-delta")) {
1523 data->use_ofs_delta = 1;
1524 continue;
1525 }
1526 if (!strcmp(arg, "no-progress")) {
1527 data->no_progress = 1;
1528 continue;
1529 }
1530 if (!strcmp(arg, "include-tag")) {
1531 data->use_include_tag = 1;
1532 continue;
1533 }
1534 if (!strcmp(arg, "done")) {
1535 data->done = 1;
1536 continue;
1537 }
1538 if (!strcmp(arg, "wait-for-done")) {
1539 data->wait_for_done = 1;
1540 continue;
1541 }
1542
1543 /* Shallow related arguments */
1544 if (process_shallow(arg, &data->shallows))
1545 continue;
1546 if (process_deepen(arg, &data->depth))
1547 continue;
1548 if (process_deepen_since(arg, &data->deepen_since,
1549 &data->deepen_rev_list))
1550 continue;
1551 if (process_deepen_not(arg, &data->deepen_not,
1552 &data->deepen_rev_list))
1553 continue;
1554 if (!strcmp(arg, "deepen-relative")) {
1555 data->deepen_relative = 1;
1556 continue;
1557 }
1558
1559 if (data->allow_filter && skip_prefix(arg, "filter ", &p)) {
1560 list_objects_filter_die_if_populated(&data->filter_options);
1561 parse_list_objects_filter(&data->filter_options, p);
1562 die_if_using_banned_filter(data);
1563 continue;
1564 }
1565
1566 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1567 data->allow_sideband_all) &&
1568 !strcmp(arg, "sideband-all")) {
1569 data->writer.use_sideband = 1;
1570 continue;
1571 }
1572
1573 if (skip_prefix(arg, "packfile-uris ", &p)) {
1574 string_list_split(&data->uri_protocols, p, ',', -1);
1575 continue;
1576 }
1577
1578 /* ignore unknown lines maybe? */
1579 die("unexpected line: '%s'", arg);
1580 }
1581
1582 if (data->uri_protocols.nr && !data->writer.use_sideband)
1583 string_list_clear(&data->uri_protocols, 0);
1584
1585 if (request->status != PACKET_READ_FLUSH)
1586 die(_("expected flush after fetch arguments"));
1587 }
1588
1589 static int process_haves(struct upload_pack_data *data, struct oid_array *common)
1590 {
1591 int i;
1592
1593 /* Process haves */
1594 for (i = 0; i < data->haves.nr; i++) {
1595 const struct object_id *oid = &data->haves.oid[i];
1596
1597 if (!has_object_file_with_flags(oid,
1598 OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
1599 continue;
1600
1601 oid_array_append(common, oid);
1602
1603 do_got_oid(data, oid);
1604 }
1605
1606 return 0;
1607 }
1608
1609 static int send_acks(struct upload_pack_data *data, struct oid_array *acks)
1610 {
1611 int i;
1612
1613 packet_writer_write(&data->writer, "acknowledgments\n");
1614
1615 /* Send Acks */
1616 if (!acks->nr)
1617 packet_writer_write(&data->writer, "NAK\n");
1618
1619 for (i = 0; i < acks->nr; i++) {
1620 packet_writer_write(&data->writer, "ACK %s\n",
1621 oid_to_hex(&acks->oid[i]));
1622 }
1623
1624 if (!data->wait_for_done && ok_to_give_up(data)) {
1625 /* Send Ready */
1626 packet_writer_write(&data->writer, "ready\n");
1627 return 1;
1628 }
1629
1630 return 0;
1631 }
1632
1633 static int process_haves_and_send_acks(struct upload_pack_data *data)
1634 {
1635 struct oid_array common = OID_ARRAY_INIT;
1636 int ret = 0;
1637
1638 process_haves(data, &common);
1639 if (data->done) {
1640 ret = 1;
1641 } else if (send_acks(data, &common)) {
1642 packet_writer_delim(&data->writer);
1643 ret = 1;
1644 } else {
1645 /* Add Flush */
1646 packet_writer_flush(&data->writer);
1647 ret = 0;
1648 }
1649
1650 oid_array_clear(&data->haves);
1651 oid_array_clear(&common);
1652 return ret;
1653 }
1654
1655 static void send_wanted_ref_info(struct upload_pack_data *data)
1656 {
1657 const struct string_list_item *item;
1658
1659 if (!data->wanted_refs.nr)
1660 return;
1661
1662 packet_writer_write(&data->writer, "wanted-refs\n");
1663
1664 for_each_string_list_item(item, &data->wanted_refs) {
1665 packet_writer_write(&data->writer, "%s %s\n",
1666 oid_to_hex(item->util),
1667 item->string);
1668 }
1669
1670 packet_writer_delim(&data->writer);
1671 }
1672
1673 static void send_shallow_info(struct upload_pack_data *data)
1674 {
1675 /* No shallow info needs to be sent */
1676 if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1677 !is_repository_shallow(the_repository))
1678 return;
1679
1680 packet_writer_write(&data->writer, "shallow-info\n");
1681
1682 if (!send_shallow_list(data) &&
1683 is_repository_shallow(the_repository))
1684 deepen(data, INFINITE_DEPTH);
1685
1686 packet_delim(1);
1687 }
1688
1689 enum fetch_state {
1690 FETCH_PROCESS_ARGS = 0,
1691 FETCH_SEND_ACKS,
1692 FETCH_SEND_PACK,
1693 FETCH_DONE,
1694 };
1695
1696 int upload_pack_v2(struct repository *r, struct packet_reader *request)
1697 {
1698 enum fetch_state state = FETCH_PROCESS_ARGS;
1699 struct upload_pack_data data;
1700
1701 clear_object_flags(ALL_FLAGS);
1702
1703 upload_pack_data_init(&data);
1704 data.use_sideband = LARGE_PACKET_MAX;
1705 get_upload_pack_config(&data);
1706
1707 while (state != FETCH_DONE) {
1708 switch (state) {
1709 case FETCH_PROCESS_ARGS:
1710 process_args(request, &data);
1711
1712 if (!data.want_obj.nr && !data.wait_for_done) {
1713 /*
1714 * Request didn't contain any 'want' lines (and
1715 * the request does not contain
1716 * "wait-for-done", in which it is reasonable
1717 * to just send 'have's without 'want's); guess
1718 * they didn't want anything.
1719 */
1720 state = FETCH_DONE;
1721 } else if (data.haves.nr) {
1722 /*
1723 * Request had 'have' lines, so lets ACK them.
1724 */
1725 state = FETCH_SEND_ACKS;
1726 } else {
1727 /*
1728 * Request had 'want's but no 'have's so we can
1729 * immedietly go to construct and send a pack.
1730 */
1731 state = FETCH_SEND_PACK;
1732 }
1733 break;
1734 case FETCH_SEND_ACKS:
1735 if (process_haves_and_send_acks(&data))
1736 state = FETCH_SEND_PACK;
1737 else
1738 state = FETCH_DONE;
1739 break;
1740 case FETCH_SEND_PACK:
1741 send_wanted_ref_info(&data);
1742 send_shallow_info(&data);
1743
1744 if (data.uri_protocols.nr) {
1745 create_pack_file(&data, &data.uri_protocols);
1746 } else {
1747 packet_writer_write(&data.writer, "packfile\n");
1748 create_pack_file(&data, NULL);
1749 }
1750 state = FETCH_DONE;
1751 break;
1752 case FETCH_DONE:
1753 continue;
1754 }
1755 }
1756
1757 upload_pack_data_clear(&data);
1758 return 0;
1759 }
1760
1761 int upload_pack_advertise(struct repository *r,
1762 struct strbuf *value)
1763 {
1764 if (value) {
1765 int allow_filter_value;
1766 int allow_ref_in_want;
1767 int allow_sideband_all_value;
1768 char *str = NULL;
1769
1770 strbuf_addstr(value, "shallow wait-for-done");
1771
1772 if (!repo_config_get_bool(the_repository,
1773 "uploadpack.allowfilter",
1774 &allow_filter_value) &&
1775 allow_filter_value)
1776 strbuf_addstr(value, " filter");
1777
1778 if (!repo_config_get_bool(the_repository,
1779 "uploadpack.allowrefinwant",
1780 &allow_ref_in_want) &&
1781 allow_ref_in_want)
1782 strbuf_addstr(value, " ref-in-want");
1783
1784 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1785 (!repo_config_get_bool(the_repository,
1786 "uploadpack.allowsidebandall",
1787 &allow_sideband_all_value) &&
1788 allow_sideband_all_value))
1789 strbuf_addstr(value, " sideband-all");
1790
1791 if (!repo_config_get_string(the_repository,
1792 "uploadpack.blobpackfileuri",
1793 &str) &&
1794 str) {
1795 strbuf_addstr(value, " packfile-uris");
1796 free(str);
1797 }
1798 }
1799
1800 return 1;
1801 }
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