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