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[git/debian.git] / upload-pack.c
blob1006bebd502b884f979ce7054153a654bbbb208f
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 allow_filter : 1;
107 unsigned allow_filter_fallback : 1;
108 unsigned long tree_filter_max_depth;
109
110 unsigned done : 1; /* v2 only */
111 unsigned allow_ref_in_want : 1; /* v2 only */
112 unsigned allow_sideband_all : 1; /* v2 only */
113 };
114
115 static void upload_pack_data_init(struct upload_pack_data *data)
116 {
117 struct string_list symref = STRING_LIST_INIT_DUP;
118 struct string_list wanted_refs = STRING_LIST_INIT_DUP;
119 struct object_array want_obj = OBJECT_ARRAY_INIT;
120 struct object_array have_obj = OBJECT_ARRAY_INIT;
121 struct oid_array haves = OID_ARRAY_INIT;
122 struct object_array shallows = OBJECT_ARRAY_INIT;
123 struct string_list deepen_not = STRING_LIST_INIT_DUP;
124 struct string_list uri_protocols = STRING_LIST_INIT_DUP;
125 struct object_array extra_edge_obj = OBJECT_ARRAY_INIT;
126 struct string_list allowed_filters = STRING_LIST_INIT_DUP;
127
128 memset(data, 0, sizeof(*data));
129 data->symref = symref;
130 data->wanted_refs = wanted_refs;
131 data->want_obj = want_obj;
132 data->have_obj = have_obj;
133 data->haves = haves;
134 data->shallows = shallows;
135 data->deepen_not = deepen_not;
136 data->uri_protocols = uri_protocols;
137 data->extra_edge_obj = extra_edge_obj;
138 data->allowed_filters = allowed_filters;
139 data->allow_filter_fallback = 1;
140 data->tree_filter_max_depth = ULONG_MAX;
141 packet_writer_init(&data->writer, 1);
142
143 data->keepalive = 5;
144 }
145
146 static void upload_pack_data_clear(struct upload_pack_data *data)
147 {
148 string_list_clear(&data->symref, 1);
149 string_list_clear(&data->wanted_refs, 1);
150 object_array_clear(&data->want_obj);
151 object_array_clear(&data->have_obj);
152 oid_array_clear(&data->haves);
153 object_array_clear(&data->shallows);
154 string_list_clear(&data->deepen_not, 0);
155 object_array_clear(&data->extra_edge_obj);
156 list_objects_filter_release(&data->filter_options);
157 string_list_clear(&data->allowed_filters, 1);
158
159 free((char *)data->pack_objects_hook);
160 }
161
162 static void reset_timeout(unsigned int timeout)
163 {
164 alarm(timeout);
165 }
166
167 static void send_client_data(int fd, const char *data, ssize_t sz,
168 int use_sideband)
169 {
170 if (use_sideband) {
171 send_sideband(1, fd, data, sz, use_sideband);
172 return;
173 }
174 if (fd == 3)
175 /* emergency quit */
176 fd = 2;
177 if (fd == 2) {
178 /* XXX: are we happy to lose stuff here? */
179 xwrite(fd, data, sz);
180 return;
181 }
182 write_or_die(fd, data, sz);
183 }
184
185 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
186 {
187 FILE *fp = cb_data;
188 if (graft->nr_parent == -1)
189 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
190 return 0;
191 }
192
193 struct output_state {
194 char buffer[8193];
195 int used;
196 unsigned packfile_uris_started : 1;
197 unsigned packfile_started : 1;
198 };
199
200 static int relay_pack_data(int pack_objects_out, struct output_state *os,
201 int use_sideband, int write_packfile_line)
202 {
203 /*
204 * We keep the last byte to ourselves
205 * in case we detect broken rev-list, so that we
206 * can leave the stream corrupted. This is
207 * unfortunate -- unpack-objects would happily
208 * accept a valid packdata with trailing garbage,
209 * so appending garbage after we pass all the
210 * pack data is not good enough to signal
211 * breakage to downstream.
212 */
213 ssize_t readsz;
214
215 readsz = xread(pack_objects_out, os->buffer + os->used,
216 sizeof(os->buffer) - os->used);
217 if (readsz < 0) {
218 return readsz;
219 }
220 os->used += readsz;
221
222 while (!os->packfile_started) {
223 char *p;
224 if (os->used >= 4 && !memcmp(os->buffer, "PACK", 4)) {
225 os->packfile_started = 1;
226 if (write_packfile_line) {
227 if (os->packfile_uris_started)
228 packet_delim(1);
229 packet_write_fmt(1, "\1packfile\n");
230 }
231 break;
232 }
233 if ((p = memchr(os->buffer, '\n', os->used))) {
234 if (!os->packfile_uris_started) {
235 os->packfile_uris_started = 1;
236 if (!write_packfile_line)
237 BUG("packfile_uris requires sideband-all");
238 packet_write_fmt(1, "\1packfile-uris\n");
239 }
240 *p = '\0';
241 packet_write_fmt(1, "\1%s\n", os->buffer);
242
243 os->used -= p - os->buffer + 1;
244 memmove(os->buffer, p + 1, os->used);
245 } else {
246 /*
247 * Incomplete line.
248 */
249 return readsz;
250 }
251 }
252
253 if (os->used > 1) {
254 send_client_data(1, os->buffer, os->used - 1, use_sideband);
255 os->buffer[0] = os->buffer[os->used - 1];
256 os->used = 1;
257 } else {
258 send_client_data(1, os->buffer, os->used, use_sideband);
259 os->used = 0;
260 }
261
262 return readsz;
263 }
264
265 static void create_pack_file(struct upload_pack_data *pack_data,
266 const struct string_list *uri_protocols)
267 {
268 struct child_process pack_objects = CHILD_PROCESS_INIT;
269 struct output_state output_state = { { 0 } };
270 char progress[128];
271 char abort_msg[] = "aborting due to possible repository "
272 "corruption on the remote side.";
273 ssize_t sz;
274 int i;
275 FILE *pipe_fd;
276
277 if (!pack_data->pack_objects_hook)
278 pack_objects.git_cmd = 1;
279 else {
280 strvec_push(&pack_objects.args, pack_data->pack_objects_hook);
281 strvec_push(&pack_objects.args, "git");
282 pack_objects.use_shell = 1;
283 }
284
285 if (pack_data->shallow_nr) {
286 strvec_push(&pack_objects.args, "--shallow-file");
287 strvec_push(&pack_objects.args, "");
288 }
289 strvec_push(&pack_objects.args, "pack-objects");
290 strvec_push(&pack_objects.args, "--revs");
291 if (pack_data->use_thin_pack)
292 strvec_push(&pack_objects.args, "--thin");
293
294 strvec_push(&pack_objects.args, "--stdout");
295 if (pack_data->shallow_nr)
296 strvec_push(&pack_objects.args, "--shallow");
297 if (!pack_data->no_progress)
298 strvec_push(&pack_objects.args, "--progress");
299 if (pack_data->use_ofs_delta)
300 strvec_push(&pack_objects.args, "--delta-base-offset");
301 if (pack_data->use_include_tag)
302 strvec_push(&pack_objects.args, "--include-tag");
303 if (pack_data->filter_options.choice) {
304 const char *spec =
305 expand_list_objects_filter_spec(&pack_data->filter_options);
306 if (pack_objects.use_shell) {
307 struct strbuf buf = STRBUF_INIT;
308 sq_quote_buf(&buf, spec);
309 strvec_pushf(&pack_objects.args, "--filter=%s", buf.buf);
310 strbuf_release(&buf);
311 } else {
312 strvec_pushf(&pack_objects.args, "--filter=%s", spec);
313 }
314 }
315 if (uri_protocols) {
316 for (i = 0; i < uri_protocols->nr; i++)
317 strvec_pushf(&pack_objects.args, "--uri-protocol=%s",
318 uri_protocols->items[i].string);
319 }
320
321 pack_objects.in = -1;
322 pack_objects.out = -1;
323 pack_objects.err = -1;
324 pack_objects.clean_on_exit = 1;
325
326 if (start_command(&pack_objects))
327 die("git upload-pack: unable to fork git-pack-objects");
328
329 pipe_fd = xfdopen(pack_objects.in, "w");
330
331 if (pack_data->shallow_nr)
332 for_each_commit_graft(write_one_shallow, pipe_fd);
333
334 for (i = 0; i < pack_data->want_obj.nr; i++)
335 fprintf(pipe_fd, "%s\n",
336 oid_to_hex(&pack_data->want_obj.objects[i].item->oid));
337 fprintf(pipe_fd, "--not\n");
338 for (i = 0; i < pack_data->have_obj.nr; i++)
339 fprintf(pipe_fd, "%s\n",
340 oid_to_hex(&pack_data->have_obj.objects[i].item->oid));
341 for (i = 0; i < pack_data->extra_edge_obj.nr; i++)
342 fprintf(pipe_fd, "%s\n",
343 oid_to_hex(&pack_data->extra_edge_obj.objects[i].item->oid));
344 fprintf(pipe_fd, "\n");
345 fflush(pipe_fd);
346 fclose(pipe_fd);
347
348 /* We read from pack_objects.err to capture stderr output for
349 * progress bar, and pack_objects.out to capture the pack data.
350 */
351
352 while (1) {
353 struct pollfd pfd[2];
354 int pe, pu, pollsize, polltimeout;
355 int ret;
356
357 reset_timeout(pack_data->timeout);
358
359 pollsize = 0;
360 pe = pu = -1;
361
362 if (0 <= pack_objects.out) {
363 pfd[pollsize].fd = pack_objects.out;
364 pfd[pollsize].events = POLLIN;
365 pu = pollsize;
366 pollsize++;
367 }
368 if (0 <= pack_objects.err) {
369 pfd[pollsize].fd = pack_objects.err;
370 pfd[pollsize].events = POLLIN;
371 pe = pollsize;
372 pollsize++;
373 }
374
375 if (!pollsize)
376 break;
377
378 polltimeout = pack_data->keepalive < 0
379 ? -1
380 : 1000 * pack_data->keepalive;
381
382 ret = poll(pfd, pollsize, polltimeout);
383
384 if (ret < 0) {
385 if (errno != EINTR) {
386 error_errno("poll failed, resuming");
387 sleep(1);
388 }
389 continue;
390 }
391 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
392 /* Status ready; we ship that in the side-band
393 * or dump to the standard error.
394 */
395 sz = xread(pack_objects.err, progress,
396 sizeof(progress));
397 if (0 < sz)
398 send_client_data(2, progress, sz,
399 pack_data->use_sideband);
400 else if (sz == 0) {
401 close(pack_objects.err);
402 pack_objects.err = -1;
403 }
404 else
405 goto fail;
406 /* give priority to status messages */
407 continue;
408 }
409 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
410 int result = relay_pack_data(pack_objects.out,
411 &output_state,
412 pack_data->use_sideband,
413 !!uri_protocols);
414
415 if (result == 0) {
416 close(pack_objects.out);
417 pack_objects.out = -1;
418 } else if (result < 0) {
419 goto fail;
420 }
421 }
422
423 /*
424 * We hit the keepalive timeout without saying anything; send
425 * an empty message on the data sideband just to let the other
426 * side know we're still working on it, but don't have any data
427 * yet.
428 *
429 * If we don't have a sideband channel, there's no room in the
430 * protocol to say anything, so those clients are just out of
431 * luck.
432 */
433 if (!ret && pack_data->use_sideband) {
434 static const char buf[] = "0005\1";
435 write_or_die(1, buf, 5);
436 }
437 }
438
439 if (finish_command(&pack_objects)) {
440 error("git upload-pack: git-pack-objects died with error.");
441 goto fail;
442 }
443
444 /* flush the data */
445 if (output_state.used > 0) {
446 send_client_data(1, output_state.buffer, output_state.used,
447 pack_data->use_sideband);
448 fprintf(stderr, "flushed.\n");
449 }
450 if (pack_data->use_sideband)
451 packet_flush(1);
452 return;
453
454 fail:
455 send_client_data(3, abort_msg, sizeof(abort_msg),
456 pack_data->use_sideband);
457 die("git upload-pack: %s", abort_msg);
458 }
459
460 static int do_got_oid(struct upload_pack_data *data, const struct object_id *oid)
461 {
462 int we_knew_they_have = 0;
463 struct object *o = parse_object(the_repository, oid);
464
465 if (!o)
466 die("oops (%s)", oid_to_hex(oid));
467 if (o->type == OBJ_COMMIT) {
468 struct commit_list *parents;
469 struct commit *commit = (struct commit *)o;
470 if (o->flags & THEY_HAVE)
471 we_knew_they_have = 1;
472 else
473 o->flags |= THEY_HAVE;
474 if (!data->oldest_have || (commit->date < data->oldest_have))
475 data->oldest_have = commit->date;
476 for (parents = commit->parents;
477 parents;
478 parents = parents->next)
479 parents->item->object.flags |= THEY_HAVE;
480 }
481 if (!we_knew_they_have) {
482 add_object_array(o, NULL, &data->have_obj);
483 return 1;
484 }
485 return 0;
486 }
487
488 static int got_oid(struct upload_pack_data *data,
489 const char *hex, struct object_id *oid)
490 {
491 if (get_oid_hex(hex, oid))
492 die("git upload-pack: expected SHA1 object, got '%s'", hex);
493 if (!has_object_file_with_flags(oid,
494 OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
495 return -1;
496 return do_got_oid(data, oid);
497 }
498
499 static int ok_to_give_up(struct upload_pack_data *data)
500 {
501 uint32_t min_generation = GENERATION_NUMBER_ZERO;
502
503 if (!data->have_obj.nr)
504 return 0;
505
506 return can_all_from_reach_with_flag(&data->want_obj, THEY_HAVE,
507 COMMON_KNOWN, data->oldest_have,
508 min_generation);
509 }
510
511 static int get_common_commits(struct upload_pack_data *data,
512 struct packet_reader *reader)
513 {
514 struct object_id oid;
515 char last_hex[GIT_MAX_HEXSZ + 1];
516 int got_common = 0;
517 int got_other = 0;
518 int sent_ready = 0;
519
520 save_commit_buffer = 0;
521
522 for (;;) {
523 const char *arg;
524
525 reset_timeout(data->timeout);
526
527 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
528 if (data->multi_ack == MULTI_ACK_DETAILED
529 && got_common
530 && !got_other
531 && ok_to_give_up(data)) {
532 sent_ready = 1;
533 packet_write_fmt(1, "ACK %s ready\n", last_hex);
534 }
535 if (data->have_obj.nr == 0 || data->multi_ack)
536 packet_write_fmt(1, "NAK\n");
537
538 if (data->no_done && sent_ready) {
539 packet_write_fmt(1, "ACK %s\n", last_hex);
540 return 0;
541 }
542 if (data->stateless_rpc)
543 exit(0);
544 got_common = 0;
545 got_other = 0;
546 continue;
547 }
548 if (skip_prefix(reader->line, "have ", &arg)) {
549 switch (got_oid(data, arg, &oid)) {
550 case -1: /* they have what we do not */
551 got_other = 1;
552 if (data->multi_ack
553 && ok_to_give_up(data)) {
554 const char *hex = oid_to_hex(&oid);
555 if (data->multi_ack == MULTI_ACK_DETAILED) {
556 sent_ready = 1;
557 packet_write_fmt(1, "ACK %s ready\n", hex);
558 } else
559 packet_write_fmt(1, "ACK %s continue\n", hex);
560 }
561 break;
562 default:
563 got_common = 1;
564 oid_to_hex_r(last_hex, &oid);
565 if (data->multi_ack == MULTI_ACK_DETAILED)
566 packet_write_fmt(1, "ACK %s common\n", last_hex);
567 else if (data->multi_ack)
568 packet_write_fmt(1, "ACK %s continue\n", last_hex);
569 else if (data->have_obj.nr == 1)
570 packet_write_fmt(1, "ACK %s\n", last_hex);
571 break;
572 }
573 continue;
574 }
575 if (!strcmp(reader->line, "done")) {
576 if (data->have_obj.nr > 0) {
577 if (data->multi_ack)
578 packet_write_fmt(1, "ACK %s\n", last_hex);
579 return 0;
580 }
581 packet_write_fmt(1, "NAK\n");
582 return -1;
583 }
584 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
585 }
586 }
587
588 static int is_our_ref(struct object *o, enum allow_uor allow_uor)
589 {
590 int allow_hidden_ref = (allow_uor &
591 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
592 return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
593 }
594
595 /*
596 * on successful case, it's up to the caller to close cmd->out
597 */
598 static int do_reachable_revlist(struct child_process *cmd,
599 struct object_array *src,
600 struct object_array *reachable,
601 enum allow_uor allow_uor)
602 {
603 static const char *argv[] = {
604 "rev-list", "--stdin", NULL,
605 };
606 struct object *o;
607 FILE *cmd_in = NULL;
608 int i;
609
610 cmd->argv = argv;
611 cmd->git_cmd = 1;
612 cmd->no_stderr = 1;
613 cmd->in = -1;
614 cmd->out = -1;
615
616 /*
617 * If the next rev-list --stdin encounters an unknown commit,
618 * it terminates, which will cause SIGPIPE in the write loop
619 * below.
620 */
621 sigchain_push(SIGPIPE, SIG_IGN);
622
623 if (start_command(cmd))
624 goto error;
625
626 cmd_in = xfdopen(cmd->in, "w");
627
628 for (i = get_max_object_index(); 0 < i; ) {
629 o = get_indexed_object(--i);
630 if (!o)
631 continue;
632 if (reachable && o->type == OBJ_COMMIT)
633 o->flags &= ~TMP_MARK;
634 if (!is_our_ref(o, allow_uor))
635 continue;
636 if (fprintf(cmd_in, "^%s\n", oid_to_hex(&o->oid)) < 0)
637 goto error;
638 }
639 for (i = 0; i < src->nr; i++) {
640 o = src->objects[i].item;
641 if (is_our_ref(o, allow_uor)) {
642 if (reachable)
643 add_object_array(o, NULL, reachable);
644 continue;
645 }
646 if (reachable && o->type == OBJ_COMMIT)
647 o->flags |= TMP_MARK;
648 if (fprintf(cmd_in, "%s\n", oid_to_hex(&o->oid)) < 0)
649 goto error;
650 }
651 if (ferror(cmd_in) || fflush(cmd_in))
652 goto error;
653 fclose(cmd_in);
654 cmd->in = -1;
655 sigchain_pop(SIGPIPE);
656
657 return 0;
658
659 error:
660 sigchain_pop(SIGPIPE);
661
662 if (cmd_in)
663 fclose(cmd_in);
664 if (cmd->out >= 0)
665 close(cmd->out);
666 return -1;
667 }
668
669 static int get_reachable_list(struct upload_pack_data *data,
670 struct object_array *reachable)
671 {
672 struct child_process cmd = CHILD_PROCESS_INIT;
673 int i;
674 struct object *o;
675 char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
676 const unsigned hexsz = the_hash_algo->hexsz;
677
678 if (do_reachable_revlist(&cmd, &data->shallows, reachable,
679 data->allow_uor) < 0)
680 return -1;
681
682 while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
683 struct object_id oid;
684 const char *p;
685
686 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
687 break;
688
689 o = lookup_object(the_repository, &oid);
690 if (o && o->type == OBJ_COMMIT) {
691 o->flags &= ~TMP_MARK;
692 }
693 }
694 for (i = get_max_object_index(); 0 < i; i--) {
695 o = get_indexed_object(i - 1);
696 if (o && o->type == OBJ_COMMIT &&
697 (o->flags & TMP_MARK)) {
698 add_object_array(o, NULL, reachable);
699 o->flags &= ~TMP_MARK;
700 }
701 }
702 close(cmd.out);
703
704 if (finish_command(&cmd))
705 return -1;
706
707 return 0;
708 }
709
710 static int has_unreachable(struct object_array *src, enum allow_uor allow_uor)
711 {
712 struct child_process cmd = CHILD_PROCESS_INIT;
713 char buf[1];
714 int i;
715
716 if (do_reachable_revlist(&cmd, src, NULL, allow_uor) < 0)
717 return 1;
718
719 /*
720 * The commits out of the rev-list are not ancestors of
721 * our ref.
722 */
723 i = read_in_full(cmd.out, buf, 1);
724 if (i)
725 goto error;
726 close(cmd.out);
727 cmd.out = -1;
728
729 /*
730 * rev-list may have died by encountering a bad commit
731 * in the history, in which case we do want to bail out
732 * even when it showed no commit.
733 */
734 if (finish_command(&cmd))
735 goto error;
736
737 /* All the non-tip ones are ancestors of what we advertised */
738 return 0;
739
740 error:
741 if (cmd.out >= 0)
742 close(cmd.out);
743 return 1;
744 }
745
746 static void check_non_tip(struct upload_pack_data *data)
747 {
748 int i;
749
750 /*
751 * In the normal in-process case without
752 * uploadpack.allowReachableSHA1InWant,
753 * non-tip requests can never happen.
754 */
755 if (!data->stateless_rpc && !(data->allow_uor & ALLOW_REACHABLE_SHA1))
756 goto error;
757 if (!has_unreachable(&data->want_obj, data->allow_uor))
758 /* All the non-tip ones are ancestors of what we advertised */
759 return;
760
761 error:
762 /* Pick one of them (we know there at least is one) */
763 for (i = 0; i < data->want_obj.nr; i++) {
764 struct object *o = data->want_obj.objects[i].item;
765 if (!is_our_ref(o, data->allow_uor)) {
766 packet_writer_error(&data->writer,
767 "upload-pack: not our ref %s",
768 oid_to_hex(&o->oid));
769 die("git upload-pack: not our ref %s",
770 oid_to_hex(&o->oid));
771 }
772 }
773 }
774
775 static void send_shallow(struct upload_pack_data *data,
776 struct commit_list *result)
777 {
778 while (result) {
779 struct object *object = &result->item->object;
780 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
781 packet_writer_write(&data->writer, "shallow %s",
782 oid_to_hex(&object->oid));
783 register_shallow(the_repository, &object->oid);
784 data->shallow_nr++;
785 }
786 result = result->next;
787 }
788 }
789
790 static void send_unshallow(struct upload_pack_data *data)
791 {
792 int i;
793
794 for (i = 0; i < data->shallows.nr; i++) {
795 struct object *object = data->shallows.objects[i].item;
796 if (object->flags & NOT_SHALLOW) {
797 struct commit_list *parents;
798 packet_writer_write(&data->writer, "unshallow %s",
799 oid_to_hex(&object->oid));
800 object->flags &= ~CLIENT_SHALLOW;
801 /*
802 * We want to _register_ "object" as shallow, but we
803 * also need to traverse object's parents to deepen a
804 * shallow clone. Unregister it for now so we can
805 * parse and add the parents to the want list, then
806 * re-register it.
807 */
808 unregister_shallow(&object->oid);
809 object->parsed = 0;
810 parse_commit_or_die((struct commit *)object);
811 parents = ((struct commit *)object)->parents;
812 while (parents) {
813 add_object_array(&parents->item->object,
814 NULL, &data->want_obj);
815 parents = parents->next;
816 }
817 add_object_array(object, NULL, &data->extra_edge_obj);
818 }
819 /* make sure commit traversal conforms to client */
820 register_shallow(the_repository, &object->oid);
821 }
822 }
823
824 static int check_ref(const char *refname_full, const struct object_id *oid,
825 int flag, void *cb_data);
826 static void deepen(struct upload_pack_data *data, int depth)
827 {
828 if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
829 int i;
830
831 for (i = 0; i < data->shallows.nr; i++) {
832 struct object *object = data->shallows.objects[i].item;
833 object->flags |= NOT_SHALLOW;
834 }
835 } else if (data->deepen_relative) {
836 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
837 struct commit_list *result;
838
839 /*
840 * Checking for reachable shallows requires that our refs be
841 * marked with OUR_REF.
842 */
843 head_ref_namespaced(check_ref, NULL);
844 for_each_namespaced_ref(check_ref, NULL);
845
846 get_reachable_list(data, &reachable_shallows);
847 result = get_shallow_commits(&reachable_shallows,
848 depth + 1,
849 SHALLOW, NOT_SHALLOW);
850 send_shallow(data, result);
851 free_commit_list(result);
852 object_array_clear(&reachable_shallows);
853 } else {
854 struct commit_list *result;
855
856 result = get_shallow_commits(&data->want_obj, depth,
857 SHALLOW, NOT_SHALLOW);
858 send_shallow(data, result);
859 free_commit_list(result);
860 }
861
862 send_unshallow(data);
863 }
864
865 static void deepen_by_rev_list(struct upload_pack_data *data,
866 int ac,
867 const char **av)
868 {
869 struct commit_list *result;
870
871 disable_commit_graph(the_repository);
872 result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
873 send_shallow(data, result);
874 free_commit_list(result);
875 send_unshallow(data);
876 }
877
878 /* Returns 1 if a shallow list is sent or 0 otherwise */
879 static int send_shallow_list(struct upload_pack_data *data)
880 {
881 int ret = 0;
882
883 if (data->depth > 0 && data->deepen_rev_list)
884 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
885 if (data->depth > 0) {
886 deepen(data, data->depth);
887 ret = 1;
888 } else if (data->deepen_rev_list) {
889 struct strvec av = STRVEC_INIT;
890 int i;
891
892 strvec_push(&av, "rev-list");
893 if (data->deepen_since)
894 strvec_pushf(&av, "--max-age=%"PRItime, data->deepen_since);
895 if (data->deepen_not.nr) {
896 strvec_push(&av, "--not");
897 for (i = 0; i < data->deepen_not.nr; i++) {
898 struct string_list_item *s = data->deepen_not.items + i;
899 strvec_push(&av, s->string);
900 }
901 strvec_push(&av, "--not");
902 }
903 for (i = 0; i < data->want_obj.nr; i++) {
904 struct object *o = data->want_obj.objects[i].item;
905 strvec_push(&av, oid_to_hex(&o->oid));
906 }
907 deepen_by_rev_list(data, av.nr, av.v);
908 strvec_clear(&av);
909 ret = 1;
910 } else {
911 if (data->shallows.nr > 0) {
912 int i;
913 for (i = 0; i < data->shallows.nr; i++)
914 register_shallow(the_repository,
915 &data->shallows.objects[i].item->oid);
916 }
917 }
918
919 data->shallow_nr += data->shallows.nr;
920 return ret;
921 }
922
923 static int process_shallow(const char *line, struct object_array *shallows)
924 {
925 const char *arg;
926 if (skip_prefix(line, "shallow ", &arg)) {
927 struct object_id oid;
928 struct object *object;
929 if (get_oid_hex(arg, &oid))
930 die("invalid shallow line: %s", line);
931 object = parse_object(the_repository, &oid);
932 if (!object)
933 return 1;
934 if (object->type != OBJ_COMMIT)
935 die("invalid shallow object %s", oid_to_hex(&oid));
936 if (!(object->flags & CLIENT_SHALLOW)) {
937 object->flags |= CLIENT_SHALLOW;
938 add_object_array(object, NULL, shallows);
939 }
940 return 1;
941 }
942
943 return 0;
944 }
945
946 static int process_deepen(const char *line, int *depth)
947 {
948 const char *arg;
949 if (skip_prefix(line, "deepen ", &arg)) {
950 char *end = NULL;
951 *depth = (int)strtol(arg, &end, 0);
952 if (!end || *end || *depth <= 0)
953 die("Invalid deepen: %s", line);
954 return 1;
955 }
956
957 return 0;
958 }
959
960 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
961 {
962 const char *arg;
963 if (skip_prefix(line, "deepen-since ", &arg)) {
964 char *end = NULL;
965 *deepen_since = parse_timestamp(arg, &end, 0);
966 if (!end || *end || !deepen_since ||
967 /* revisions.c's max_age -1 is special */
968 *deepen_since == -1)
969 die("Invalid deepen-since: %s", line);
970 *deepen_rev_list = 1;
971 return 1;
972 }
973 return 0;
974 }
975
976 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
977 {
978 const char *arg;
979 if (skip_prefix(line, "deepen-not ", &arg)) {
980 char *ref = NULL;
981 struct object_id oid;
982 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
983 die("git upload-pack: ambiguous deepen-not: %s", line);
984 string_list_append(deepen_not, ref);
985 free(ref);
986 *deepen_rev_list = 1;
987 return 1;
988 }
989 return 0;
990 }
991
992 NORETURN __attribute__((format(printf,2,3)))
993 static void send_err_and_die(struct upload_pack_data *data,
994 const char *fmt, ...)
995 {
996 struct strbuf buf = STRBUF_INIT;
997 va_list ap;
998
999 va_start(ap, fmt);
1000 strbuf_vaddf(&buf, fmt, ap);
1001 va_end(ap);
1002
1003 packet_writer_error(&data->writer, "%s", buf.buf);
1004 die("%s", buf.buf);
1005 }
1006
1007 static void check_one_filter(struct upload_pack_data *data,
1008 struct list_objects_filter_options *opts)
1009 {
1010 const char *key = list_object_filter_config_name(opts->choice);
1011 struct string_list_item *item = string_list_lookup(&data->allowed_filters,
1012 key);
1013 int allowed;
1014
1015 if (item)
1016 allowed = (intptr_t)item->util;
1017 else
1018 allowed = data->allow_filter_fallback;
1019
1020 if (!allowed)
1021 send_err_and_die(data, "filter '%s' not supported", key);
1022
1023 if (opts->choice == LOFC_TREE_DEPTH &&
1024 opts->tree_exclude_depth > data->tree_filter_max_depth)
1025 send_err_and_die(data,
1026 "tree filter allows max depth %lu, but got %lu",
1027 data->tree_filter_max_depth,
1028 opts->tree_exclude_depth);
1029 }
1030
1031 static void check_filter_recurse(struct upload_pack_data *data,
1032 struct list_objects_filter_options *opts)
1033 {
1034 size_t i;
1035
1036 check_one_filter(data, opts);
1037 if (opts->choice != LOFC_COMBINE)
1038 return;
1039
1040 for (i = 0; i < opts->sub_nr; i++)
1041 check_filter_recurse(data, &opts->sub[i]);
1042 }
1043
1044 static void die_if_using_banned_filter(struct upload_pack_data *data)
1045 {
1046 check_filter_recurse(data, &data->filter_options);
1047 }
1048
1049 static void receive_needs(struct upload_pack_data *data,
1050 struct packet_reader *reader)
1051 {
1052 int has_non_tip = 0;
1053
1054 data->shallow_nr = 0;
1055 for (;;) {
1056 struct object *o;
1057 const char *features;
1058 struct object_id oid_buf;
1059 const char *arg;
1060
1061 reset_timeout(data->timeout);
1062 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
1063 break;
1064
1065 if (process_shallow(reader->line, &data->shallows))
1066 continue;
1067 if (process_deepen(reader->line, &data->depth))
1068 continue;
1069 if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
1070 continue;
1071 if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
1072 continue;
1073
1074 if (skip_prefix(reader->line, "filter ", &arg)) {
1075 if (!data->filter_capability_requested)
1076 die("git upload-pack: filtering capability not negotiated");
1077 list_objects_filter_die_if_populated(&data->filter_options);
1078 parse_list_objects_filter(&data->filter_options, arg);
1079 die_if_using_banned_filter(data);
1080 continue;
1081 }
1082
1083 if (!skip_prefix(reader->line, "want ", &arg) ||
1084 parse_oid_hex(arg, &oid_buf, &features))
1085 die("git upload-pack: protocol error, "
1086 "expected to get object ID, not '%s'", reader->line);
1087
1088 if (parse_feature_request(features, "deepen-relative"))
1089 data->deepen_relative = 1;
1090 if (parse_feature_request(features, "multi_ack_detailed"))
1091 data->multi_ack = MULTI_ACK_DETAILED;
1092 else if (parse_feature_request(features, "multi_ack"))
1093 data->multi_ack = MULTI_ACK;
1094 if (parse_feature_request(features, "no-done"))
1095 data->no_done = 1;
1096 if (parse_feature_request(features, "thin-pack"))
1097 data->use_thin_pack = 1;
1098 if (parse_feature_request(features, "ofs-delta"))
1099 data->use_ofs_delta = 1;
1100 if (parse_feature_request(features, "side-band-64k"))
1101 data->use_sideband = LARGE_PACKET_MAX;
1102 else if (parse_feature_request(features, "side-band"))
1103 data->use_sideband = DEFAULT_PACKET_MAX;
1104 if (parse_feature_request(features, "no-progress"))
1105 data->no_progress = 1;
1106 if (parse_feature_request(features, "include-tag"))
1107 data->use_include_tag = 1;
1108 if (data->allow_filter &&
1109 parse_feature_request(features, "filter"))
1110 data->filter_capability_requested = 1;
1111
1112 o = parse_object(the_repository, &oid_buf);
1113 if (!o) {
1114 packet_writer_error(&data->writer,
1115 "upload-pack: not our ref %s",
1116 oid_to_hex(&oid_buf));
1117 die("git upload-pack: not our ref %s",
1118 oid_to_hex(&oid_buf));
1119 }
1120 if (!(o->flags & WANTED)) {
1121 o->flags |= WANTED;
1122 if (!((data->allow_uor & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
1123 || is_our_ref(o, data->allow_uor)))
1124 has_non_tip = 1;
1125 add_object_array(o, NULL, &data->want_obj);
1126 }
1127 }
1128
1129 /*
1130 * We have sent all our refs already, and the other end
1131 * should have chosen out of them. When we are operating
1132 * in the stateless RPC mode, however, their choice may
1133 * have been based on the set of older refs advertised
1134 * by another process that handled the initial request.
1135 */
1136 if (has_non_tip)
1137 check_non_tip(data);
1138
1139 if (!data->use_sideband && data->daemon_mode)
1140 data->no_progress = 1;
1141
1142 if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1143 return;
1144
1145 if (send_shallow_list(data))
1146 packet_flush(1);
1147 }
1148
1149 /* return non-zero if the ref is hidden, otherwise 0 */
1150 static int mark_our_ref(const char *refname, const char *refname_full,
1151 const struct object_id *oid)
1152 {
1153 struct object *o = lookup_unknown_object(oid);
1154
1155 if (ref_is_hidden(refname, refname_full)) {
1156 o->flags |= HIDDEN_REF;
1157 return 1;
1158 }
1159 o->flags |= OUR_REF;
1160 return 0;
1161 }
1162
1163 static int check_ref(const char *refname_full, const struct object_id *oid,
1164 int flag, void *cb_data)
1165 {
1166 const char *refname = strip_namespace(refname_full);
1167
1168 mark_our_ref(refname, refname_full, oid);
1169 return 0;
1170 }
1171
1172 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1173 {
1174 struct string_list_item *item;
1175
1176 if (!symref->nr)
1177 return;
1178 for_each_string_list_item(item, symref)
1179 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1180 }
1181
1182 static int send_ref(const char *refname, const struct object_id *oid,
1183 int flag, void *cb_data)
1184 {
1185 static const char *capabilities = "multi_ack thin-pack side-band"
1186 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1187 " deepen-relative no-progress include-tag multi_ack_detailed";
1188 const char *refname_nons = strip_namespace(refname);
1189 struct object_id peeled;
1190 struct upload_pack_data *data = cb_data;
1191
1192 if (mark_our_ref(refname_nons, refname, oid))
1193 return 0;
1194
1195 if (capabilities) {
1196 struct strbuf symref_info = STRBUF_INIT;
1197
1198 format_symref_info(&symref_info, &data->symref);
1199 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s object-format=%s agent=%s\n",
1200 oid_to_hex(oid), refname_nons,
1201 0, capabilities,
1202 (data->allow_uor & ALLOW_TIP_SHA1) ?
1203 " allow-tip-sha1-in-want" : "",
1204 (data->allow_uor & ALLOW_REACHABLE_SHA1) ?
1205 " allow-reachable-sha1-in-want" : "",
1206 data->stateless_rpc ? " no-done" : "",
1207 symref_info.buf,
1208 data->allow_filter ? " filter" : "",
1209 the_hash_algo->name,
1210 git_user_agent_sanitized());
1211 strbuf_release(&symref_info);
1212 } else {
1213 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1214 }
1215 capabilities = NULL;
1216 if (!peel_ref(refname, &peeled))
1217 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1218 return 0;
1219 }
1220
1221 static int find_symref(const char *refname, const struct object_id *oid,
1222 int flag, void *cb_data)
1223 {
1224 const char *symref_target;
1225 struct string_list_item *item;
1226
1227 if ((flag & REF_ISSYMREF) == 0)
1228 return 0;
1229 symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1230 if (!symref_target || (flag & REF_ISSYMREF) == 0)
1231 die("'%s' is a symref but it is not?", refname);
1232 item = string_list_append(cb_data, strip_namespace(refname));
1233 item->util = xstrdup(strip_namespace(symref_target));
1234 return 0;
1235 }
1236
1237 static int parse_object_filter_config(const char *var, const char *value,
1238 struct upload_pack_data *data)
1239 {
1240 struct strbuf buf = STRBUF_INIT;
1241 const char *sub, *key;
1242 size_t sub_len;
1243
1244 if (parse_config_key(var, "uploadpackfilter", &sub, &sub_len, &key))
1245 return 0;
1246
1247 if (!sub) {
1248 if (!strcmp(key, "allow"))
1249 data->allow_filter_fallback = git_config_bool(var, value);
1250 return 0;
1251 }
1252
1253 strbuf_add(&buf, sub, sub_len);
1254
1255 if (!strcmp(key, "allow"))
1256 string_list_insert(&data->allowed_filters, buf.buf)->util =
1257 (void *)(intptr_t)git_config_bool(var, value);
1258 else if (!strcmp(buf.buf, "tree") && !strcmp(key, "maxdepth")) {
1259 if (!value) {
1260 strbuf_release(&buf);
1261 return config_error_nonbool(var);
1262 }
1263 string_list_insert(&data->allowed_filters, buf.buf)->util =
1264 (void *)(intptr_t)1;
1265 data->tree_filter_max_depth = git_config_ulong(var, value);
1266 }
1267
1268 strbuf_release(&buf);
1269 return 0;
1270 }
1271
1272 static int upload_pack_config(const char *var, const char *value, void *cb_data)
1273 {
1274 struct upload_pack_data *data = cb_data;
1275
1276 if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1277 if (git_config_bool(var, value))
1278 data->allow_uor |= ALLOW_TIP_SHA1;
1279 else
1280 data->allow_uor &= ~ALLOW_TIP_SHA1;
1281 } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1282 if (git_config_bool(var, value))
1283 data->allow_uor |= ALLOW_REACHABLE_SHA1;
1284 else
1285 data->allow_uor &= ~ALLOW_REACHABLE_SHA1;
1286 } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1287 if (git_config_bool(var, value))
1288 data->allow_uor |= ALLOW_ANY_SHA1;
1289 else
1290 data->allow_uor &= ~ALLOW_ANY_SHA1;
1291 } else if (!strcmp("uploadpack.keepalive", var)) {
1292 data->keepalive = git_config_int(var, value);
1293 if (!data->keepalive)
1294 data->keepalive = -1;
1295 } else if (!strcmp("uploadpack.allowfilter", var)) {
1296 data->allow_filter = git_config_bool(var, value);
1297 } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1298 data->allow_ref_in_want = git_config_bool(var, value);
1299 } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1300 data->allow_sideband_all = git_config_bool(var, value);
1301 } else if (!strcmp("core.precomposeunicode", var)) {
1302 precomposed_unicode = git_config_bool(var, value);
1303 }
1304
1305 if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
1306 current_config_scope() != CONFIG_SCOPE_WORKTREE) {
1307 if (!strcmp("uploadpack.packobjectshook", var))
1308 return git_config_string(&data->pack_objects_hook, var, value);
1309 }
1310
1311 parse_object_filter_config(var, value, data);
1312
1313 return parse_hide_refs_config(var, value, "uploadpack");
1314 }
1315
1316 void upload_pack(struct upload_pack_options *options)
1317 {
1318 struct packet_reader reader;
1319 struct upload_pack_data data;
1320
1321 upload_pack_data_init(&data);
1322
1323 git_config(upload_pack_config, &data);
1324
1325 data.stateless_rpc = options->stateless_rpc;
1326 data.daemon_mode = options->daemon_mode;
1327 data.timeout = options->timeout;
1328
1329 head_ref_namespaced(find_symref, &data.symref);
1330
1331 if (options->advertise_refs || !data.stateless_rpc) {
1332 reset_timeout(data.timeout);
1333 head_ref_namespaced(send_ref, &data);
1334 for_each_namespaced_ref(send_ref, &data);
1335 advertise_shallow_grafts(1);
1336 packet_flush(1);
1337 } else {
1338 head_ref_namespaced(check_ref, NULL);
1339 for_each_namespaced_ref(check_ref, NULL);
1340 }
1341
1342 if (!options->advertise_refs) {
1343 packet_reader_init(&reader, 0, NULL, 0,
1344 PACKET_READ_CHOMP_NEWLINE |
1345 PACKET_READ_DIE_ON_ERR_PACKET);
1346
1347 receive_needs(&data, &reader);
1348
1349 /*
1350 * An EOF at this exact point in negotiation should be
1351 * acceptable from stateless clients as they will consume the
1352 * shallow list before doing subsequent rpc with haves/etc.
1353 */
1354 if (data.stateless_rpc)
1355 reader.options |= PACKET_READ_GENTLE_ON_EOF;
1356
1357 if (data.want_obj.nr &&
1358 packet_reader_peek(&reader) != PACKET_READ_EOF) {
1359 reader.options &= ~PACKET_READ_GENTLE_ON_EOF;
1360 get_common_commits(&data, &reader);
1361 create_pack_file(&data, NULL);
1362 }
1363 }
1364
1365 upload_pack_data_clear(&data);
1366 }
1367
1368 static int parse_want(struct packet_writer *writer, const char *line,
1369 struct object_array *want_obj)
1370 {
1371 const char *arg;
1372 if (skip_prefix(line, "want ", &arg)) {
1373 struct object_id oid;
1374 struct object *o;
1375
1376 if (get_oid_hex(arg, &oid))
1377 die("git upload-pack: protocol error, "
1378 "expected to get oid, not '%s'", line);
1379
1380 o = parse_object(the_repository, &oid);
1381 if (!o) {
1382 packet_writer_error(writer,
1383 "upload-pack: not our ref %s",
1384 oid_to_hex(&oid));
1385 die("git upload-pack: not our ref %s",
1386 oid_to_hex(&oid));
1387 }
1388
1389 if (!(o->flags & WANTED)) {
1390 o->flags |= WANTED;
1391 add_object_array(o, NULL, want_obj);
1392 }
1393
1394 return 1;
1395 }
1396
1397 return 0;
1398 }
1399
1400 static int parse_want_ref(struct packet_writer *writer, const char *line,
1401 struct string_list *wanted_refs,
1402 struct object_array *want_obj)
1403 {
1404 const char *arg;
1405 if (skip_prefix(line, "want-ref ", &arg)) {
1406 struct object_id oid;
1407 struct string_list_item *item;
1408 struct object *o;
1409
1410 if (read_ref(arg, &oid)) {
1411 packet_writer_error(writer, "unknown ref %s", arg);
1412 die("unknown ref %s", arg);
1413 }
1414
1415 item = string_list_append(wanted_refs, arg);
1416 item->util = oiddup(&oid);
1417
1418 o = parse_object_or_die(&oid, arg);
1419 if (!(o->flags & WANTED)) {
1420 o->flags |= WANTED;
1421 add_object_array(o, NULL, want_obj);
1422 }
1423
1424 return 1;
1425 }
1426
1427 return 0;
1428 }
1429
1430 static int parse_have(const char *line, struct oid_array *haves)
1431 {
1432 const char *arg;
1433 if (skip_prefix(line, "have ", &arg)) {
1434 struct object_id oid;
1435
1436 if (get_oid_hex(arg, &oid))
1437 die("git upload-pack: expected SHA1 object, got '%s'", arg);
1438 oid_array_append(haves, &oid);
1439 return 1;
1440 }
1441
1442 return 0;
1443 }
1444
1445 static void process_args(struct packet_reader *request,
1446 struct upload_pack_data *data)
1447 {
1448 while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1449 const char *arg = request->line;
1450 const char *p;
1451
1452 /* process want */
1453 if (parse_want(&data->writer, arg, &data->want_obj))
1454 continue;
1455 if (data->allow_ref_in_want &&
1456 parse_want_ref(&data->writer, arg, &data->wanted_refs,
1457 &data->want_obj))
1458 continue;
1459 /* process have line */
1460 if (parse_have(arg, &data->haves))
1461 continue;
1462
1463 /* process args like thin-pack */
1464 if (!strcmp(arg, "thin-pack")) {
1465 data->use_thin_pack = 1;
1466 continue;
1467 }
1468 if (!strcmp(arg, "ofs-delta")) {
1469 data->use_ofs_delta = 1;
1470 continue;
1471 }
1472 if (!strcmp(arg, "no-progress")) {
1473 data->no_progress = 1;
1474 continue;
1475 }
1476 if (!strcmp(arg, "include-tag")) {
1477 data->use_include_tag = 1;
1478 continue;
1479 }
1480 if (!strcmp(arg, "done")) {
1481 data->done = 1;
1482 continue;
1483 }
1484
1485 /* Shallow related arguments */
1486 if (process_shallow(arg, &data->shallows))
1487 continue;
1488 if (process_deepen(arg, &data->depth))
1489 continue;
1490 if (process_deepen_since(arg, &data->deepen_since,
1491 &data->deepen_rev_list))
1492 continue;
1493 if (process_deepen_not(arg, &data->deepen_not,
1494 &data->deepen_rev_list))
1495 continue;
1496 if (!strcmp(arg, "deepen-relative")) {
1497 data->deepen_relative = 1;
1498 continue;
1499 }
1500
1501 if (data->allow_filter && skip_prefix(arg, "filter ", &p)) {
1502 list_objects_filter_die_if_populated(&data->filter_options);
1503 parse_list_objects_filter(&data->filter_options, p);
1504 die_if_using_banned_filter(data);
1505 continue;
1506 }
1507
1508 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1509 data->allow_sideband_all) &&
1510 !strcmp(arg, "sideband-all")) {
1511 data->writer.use_sideband = 1;
1512 continue;
1513 }
1514
1515 if (skip_prefix(arg, "packfile-uris ", &p)) {
1516 string_list_split(&data->uri_protocols, p, ',', -1);
1517 continue;
1518 }
1519
1520 /* ignore unknown lines maybe? */
1521 die("unexpected line: '%s'", arg);
1522 }
1523
1524 if (data->uri_protocols.nr && !data->writer.use_sideband)
1525 string_list_clear(&data->uri_protocols, 0);
1526
1527 if (request->status != PACKET_READ_FLUSH)
1528 die(_("expected flush after fetch arguments"));
1529 }
1530
1531 static int process_haves(struct upload_pack_data *data, struct oid_array *common)
1532 {
1533 int i;
1534
1535 /* Process haves */
1536 for (i = 0; i < data->haves.nr; i++) {
1537 const struct object_id *oid = &data->haves.oid[i];
1538
1539 if (!has_object_file_with_flags(oid,
1540 OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
1541 continue;
1542
1543 oid_array_append(common, oid);
1544
1545 do_got_oid(data, oid);
1546 }
1547
1548 return 0;
1549 }
1550
1551 static int send_acks(struct upload_pack_data *data, struct oid_array *acks)
1552 {
1553 int i;
1554
1555 packet_writer_write(&data->writer, "acknowledgments\n");
1556
1557 /* Send Acks */
1558 if (!acks->nr)
1559 packet_writer_write(&data->writer, "NAK\n");
1560
1561 for (i = 0; i < acks->nr; i++) {
1562 packet_writer_write(&data->writer, "ACK %s\n",
1563 oid_to_hex(&acks->oid[i]));
1564 }
1565
1566 if (ok_to_give_up(data)) {
1567 /* Send Ready */
1568 packet_writer_write(&data->writer, "ready\n");
1569 return 1;
1570 }
1571
1572 return 0;
1573 }
1574
1575 static int process_haves_and_send_acks(struct upload_pack_data *data)
1576 {
1577 struct oid_array common = OID_ARRAY_INIT;
1578 int ret = 0;
1579
1580 process_haves(data, &common);
1581 if (data->done) {
1582 ret = 1;
1583 } else if (send_acks(data, &common)) {
1584 packet_writer_delim(&data->writer);
1585 ret = 1;
1586 } else {
1587 /* Add Flush */
1588 packet_writer_flush(&data->writer);
1589 ret = 0;
1590 }
1591
1592 oid_array_clear(&data->haves);
1593 oid_array_clear(&common);
1594 return ret;
1595 }
1596
1597 static void send_wanted_ref_info(struct upload_pack_data *data)
1598 {
1599 const struct string_list_item *item;
1600
1601 if (!data->wanted_refs.nr)
1602 return;
1603
1604 packet_writer_write(&data->writer, "wanted-refs\n");
1605
1606 for_each_string_list_item(item, &data->wanted_refs) {
1607 packet_writer_write(&data->writer, "%s %s\n",
1608 oid_to_hex(item->util),
1609 item->string);
1610 }
1611
1612 packet_writer_delim(&data->writer);
1613 }
1614
1615 static void send_shallow_info(struct upload_pack_data *data)
1616 {
1617 /* No shallow info needs to be sent */
1618 if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1619 !is_repository_shallow(the_repository))
1620 return;
1621
1622 packet_writer_write(&data->writer, "shallow-info\n");
1623
1624 if (!send_shallow_list(data) &&
1625 is_repository_shallow(the_repository))
1626 deepen(data, INFINITE_DEPTH);
1627
1628 packet_delim(1);
1629 }
1630
1631 enum fetch_state {
1632 FETCH_PROCESS_ARGS = 0,
1633 FETCH_SEND_ACKS,
1634 FETCH_SEND_PACK,
1635 FETCH_DONE,
1636 };
1637
1638 int upload_pack_v2(struct repository *r, struct strvec *keys,
1639 struct packet_reader *request)
1640 {
1641 enum fetch_state state = FETCH_PROCESS_ARGS;
1642 struct upload_pack_data data;
1643
1644 clear_object_flags(ALL_FLAGS);
1645
1646 upload_pack_data_init(&data);
1647 data.use_sideband = LARGE_PACKET_MAX;
1648
1649 git_config(upload_pack_config, &data);
1650
1651 while (state != FETCH_DONE) {
1652 switch (state) {
1653 case FETCH_PROCESS_ARGS:
1654 process_args(request, &data);
1655
1656 if (!data.want_obj.nr) {
1657 /*
1658 * Request didn't contain any 'want' lines,
1659 * guess they didn't want anything.
1660 */
1661 state = FETCH_DONE;
1662 } else if (data.haves.nr) {
1663 /*
1664 * Request had 'have' lines, so lets ACK them.
1665 */
1666 state = FETCH_SEND_ACKS;
1667 } else {
1668 /*
1669 * Request had 'want's but no 'have's so we can
1670 * immedietly go to construct and send a pack.
1671 */
1672 state = FETCH_SEND_PACK;
1673 }
1674 break;
1675 case FETCH_SEND_ACKS:
1676 if (process_haves_and_send_acks(&data))
1677 state = FETCH_SEND_PACK;
1678 else
1679 state = FETCH_DONE;
1680 break;
1681 case FETCH_SEND_PACK:
1682 send_wanted_ref_info(&data);
1683 send_shallow_info(&data);
1684
1685 if (data.uri_protocols.nr) {
1686 create_pack_file(&data, &data.uri_protocols);
1687 } else {
1688 packet_writer_write(&data.writer, "packfile\n");
1689 create_pack_file(&data, NULL);
1690 }
1691 state = FETCH_DONE;
1692 break;
1693 case FETCH_DONE:
1694 continue;
1695 }
1696 }
1697
1698 upload_pack_data_clear(&data);
1699 return 0;
1700 }
1701
1702 int upload_pack_advertise(struct repository *r,
1703 struct strbuf *value)
1704 {
1705 if (value) {
1706 int allow_filter_value;
1707 int allow_ref_in_want;
1708 int allow_sideband_all_value;
1709 char *str = NULL;
1710
1711 strbuf_addstr(value, "shallow");
1712
1713 if (!repo_config_get_bool(the_repository,
1714 "uploadpack.allowfilter",
1715 &allow_filter_value) &&
1716 allow_filter_value)
1717 strbuf_addstr(value, " filter");
1718
1719 if (!repo_config_get_bool(the_repository,
1720 "uploadpack.allowrefinwant",
1721 &allow_ref_in_want) &&
1722 allow_ref_in_want)
1723 strbuf_addstr(value, " ref-in-want");
1724
1725 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1726 (!repo_config_get_bool(the_repository,
1727 "uploadpack.allowsidebandall",
1728 &allow_sideband_all_value) &&
1729 allow_sideband_all_value))
1730 strbuf_addstr(value, " sideband-all");
1731
1732 if (!repo_config_get_string(the_repository,
1733 "uploadpack.blobpackfileuri",
1734 &str) &&
1735 str) {
1736 strbuf_addstr(value, " packfile-uris");
1737 free(str);
1738 }
1739 }
1740
1741 return 1;
1742 }
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