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[thirdparty/git.git] / upload-pack.c
1 #include "git-compat-util.h"
2 #include "config.h"
3 #include "environment.h"
4 #include "gettext.h"
5 #include "hex.h"
6 #include "refs.h"
7 #include "pkt-line.h"
8 #include "sideband.h"
9 #include "repository.h"
10 #include "object-store.h"
11 #include "oid-array.h"
12 #include "tag.h"
13 #include "object.h"
14 #include "commit.h"
15 #include "diff.h"
16 #include "revision.h"
17 #include "list-objects.h"
18 #include "list-objects-filter.h"
19 #include "list-objects-filter-options.h"
20 #include "run-command.h"
21 #include "connect.h"
22 #include "sigchain.h"
23 #include "version.h"
24 #include "string-list.h"
25 #include "strvec.h"
26 #include "trace2.h"
27 #include "prio-queue.h"
28 #include "protocol.h"
29 #include "quote.h"
30 #include "upload-pack.h"
31 #include "serve.h"
32 #include "commit-graph.h"
33 #include "commit-reach.h"
34 #include "shallow.h"
35 #include "wrapper.h"
36 #include "write-or-die.h"
37
38 /* Remember to update object flag allocation in object.h */
39 #define THEY_HAVE (1u << 11)
40 #define OUR_REF (1u << 12)
41 #define WANTED (1u << 13)
42 #define COMMON_KNOWN (1u << 14)
43
44 #define SHALLOW (1u << 16)
45 #define NOT_SHALLOW (1u << 17)
46 #define CLIENT_SHALLOW (1u << 18)
47 #define HIDDEN_REF (1u << 19)
48
49 #define ALL_FLAGS (THEY_HAVE | OUR_REF | WANTED | COMMON_KNOWN | SHALLOW | \
50 NOT_SHALLOW | CLIENT_SHALLOW | HIDDEN_REF)
51
52 /* Enum for allowed unadvertised object request (UOR) */
53 enum allow_uor {
54 /* Allow specifying sha1 if it is a ref tip. */
55 ALLOW_TIP_SHA1 = 0x01,
56 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
57 ALLOW_REACHABLE_SHA1 = 0x02,
58 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
59 ALLOW_ANY_SHA1 = 0x07
60 };
61
62 /*
63 * Please annotate, and if possible group together, fields used only
64 * for protocol v0 or only for protocol v2.
65 */
66 struct upload_pack_data {
67 struct string_list symref; /* v0 only */
68 struct object_array want_obj;
69 struct object_array have_obj;
70 struct oid_array haves; /* v2 only */
71 struct string_list wanted_refs; /* v2 only */
72 struct strvec hidden_refs;
73
74 struct object_array shallows;
75 struct string_list deepen_not;
76 struct object_array extra_edge_obj;
77 int depth;
78 timestamp_t deepen_since;
79 int deepen_rev_list;
80 int deepen_relative;
81 int keepalive;
82 int shallow_nr;
83 timestamp_t oldest_have;
84
85 unsigned int timeout; /* v0 only */
86 enum {
87 NO_MULTI_ACK = 0,
88 MULTI_ACK = 1,
89 MULTI_ACK_DETAILED = 2
90 } multi_ack; /* v0 only */
91
92 /* 0 for no sideband, otherwise DEFAULT_PACKET_MAX or LARGE_PACKET_MAX */
93 int use_sideband;
94
95 struct string_list uri_protocols;
96 enum allow_uor allow_uor;
97
98 struct list_objects_filter_options filter_options;
99 struct string_list allowed_filters;
100
101 struct packet_writer writer;
102
103 const char *pack_objects_hook;
104
105 unsigned stateless_rpc : 1; /* v0 only */
106 unsigned no_done : 1; /* v0 only */
107 unsigned daemon_mode : 1; /* v0 only */
108 unsigned filter_capability_requested : 1; /* v0 only */
109
110 unsigned use_thin_pack : 1;
111 unsigned use_ofs_delta : 1;
112 unsigned no_progress : 1;
113 unsigned use_include_tag : 1;
114 unsigned wait_for_done : 1;
115 unsigned allow_filter : 1;
116 unsigned allow_filter_fallback : 1;
117 unsigned long tree_filter_max_depth;
118
119 unsigned done : 1; /* v2 only */
120 unsigned allow_ref_in_want : 1; /* v2 only */
121 unsigned allow_sideband_all : 1; /* v2 only */
122 unsigned advertise_sid : 1;
123 unsigned sent_capabilities : 1;
124 };
125
126 static void upload_pack_data_init(struct upload_pack_data *data)
127 {
128 struct string_list symref = STRING_LIST_INIT_DUP;
129 struct string_list wanted_refs = STRING_LIST_INIT_DUP;
130 struct strvec hidden_refs = STRVEC_INIT;
131 struct object_array want_obj = OBJECT_ARRAY_INIT;
132 struct object_array have_obj = OBJECT_ARRAY_INIT;
133 struct oid_array haves = OID_ARRAY_INIT;
134 struct object_array shallows = OBJECT_ARRAY_INIT;
135 struct string_list deepen_not = STRING_LIST_INIT_DUP;
136 struct string_list uri_protocols = STRING_LIST_INIT_DUP;
137 struct object_array extra_edge_obj = OBJECT_ARRAY_INIT;
138 struct string_list allowed_filters = STRING_LIST_INIT_DUP;
139
140 memset(data, 0, sizeof(*data));
141 data->symref = symref;
142 data->wanted_refs = wanted_refs;
143 data->hidden_refs = hidden_refs;
144 data->want_obj = want_obj;
145 data->have_obj = have_obj;
146 data->haves = haves;
147 data->shallows = shallows;
148 data->deepen_not = deepen_not;
149 data->uri_protocols = uri_protocols;
150 data->extra_edge_obj = extra_edge_obj;
151 data->allowed_filters = allowed_filters;
152 data->allow_filter_fallback = 1;
153 data->tree_filter_max_depth = ULONG_MAX;
154 packet_writer_init(&data->writer, 1);
155 list_objects_filter_init(&data->filter_options);
156
157 data->keepalive = 5;
158 data->advertise_sid = 0;
159 }
160
161 static void upload_pack_data_clear(struct upload_pack_data *data)
162 {
163 string_list_clear(&data->symref, 1);
164 string_list_clear(&data->wanted_refs, 1);
165 strvec_clear(&data->hidden_refs);
166 object_array_clear(&data->want_obj);
167 object_array_clear(&data->have_obj);
168 oid_array_clear(&data->haves);
169 object_array_clear(&data->shallows);
170 string_list_clear(&data->deepen_not, 0);
171 object_array_clear(&data->extra_edge_obj);
172 list_objects_filter_release(&data->filter_options);
173 string_list_clear(&data->allowed_filters, 0);
174
175 free((char *)data->pack_objects_hook);
176 }
177
178 static void reset_timeout(unsigned int timeout)
179 {
180 alarm(timeout);
181 }
182
183 static void send_client_data(int fd, const char *data, ssize_t sz,
184 int use_sideband)
185 {
186 if (use_sideband) {
187 send_sideband(1, fd, data, sz, use_sideband);
188 return;
189 }
190 if (fd == 3)
191 /* emergency quit */
192 fd = 2;
193 if (fd == 2) {
194 /* XXX: are we happy to lose stuff here? */
195 xwrite(fd, data, sz);
196 return;
197 }
198 write_or_die(fd, data, sz);
199 }
200
201 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
202 {
203 FILE *fp = cb_data;
204 if (graft->nr_parent == -1)
205 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
206 return 0;
207 }
208
209 struct output_state {
210 /*
211 * We do writes no bigger than LARGE_PACKET_DATA_MAX - 1, because with
212 * sideband-64k the band designator takes up 1 byte of space. Because
213 * relay_pack_data keeps the last byte to itself, we make the buffer 1
214 * byte bigger than the intended maximum write size.
215 */
216 char buffer[(LARGE_PACKET_DATA_MAX - 1) + 1];
217 int used;
218 unsigned packfile_uris_started : 1;
219 unsigned packfile_started : 1;
220 };
221
222 static int relay_pack_data(int pack_objects_out, struct output_state *os,
223 int use_sideband, int write_packfile_line)
224 {
225 /*
226 * We keep the last byte to ourselves
227 * in case we detect broken rev-list, so that we
228 * can leave the stream corrupted. This is
229 * unfortunate -- unpack-objects would happily
230 * accept a valid packdata with trailing garbage,
231 * so appending garbage after we pass all the
232 * pack data is not good enough to signal
233 * breakage to downstream.
234 */
235 ssize_t readsz;
236
237 readsz = xread(pack_objects_out, os->buffer + os->used,
238 sizeof(os->buffer) - os->used);
239 if (readsz < 0) {
240 return readsz;
241 }
242 os->used += readsz;
243
244 while (!os->packfile_started) {
245 char *p;
246 if (os->used >= 4 && !memcmp(os->buffer, "PACK", 4)) {
247 os->packfile_started = 1;
248 if (write_packfile_line) {
249 if (os->packfile_uris_started)
250 packet_delim(1);
251 packet_write_fmt(1, "\1packfile\n");
252 }
253 break;
254 }
255 if ((p = memchr(os->buffer, '\n', os->used))) {
256 if (!os->packfile_uris_started) {
257 os->packfile_uris_started = 1;
258 if (!write_packfile_line)
259 BUG("packfile_uris requires sideband-all");
260 packet_write_fmt(1, "\1packfile-uris\n");
261 }
262 *p = '\0';
263 packet_write_fmt(1, "\1%s\n", os->buffer);
264
265 os->used -= p - os->buffer + 1;
266 memmove(os->buffer, p + 1, os->used);
267 } else {
268 /*
269 * Incomplete line.
270 */
271 return readsz;
272 }
273 }
274
275 if (os->used > 1) {
276 send_client_data(1, os->buffer, os->used - 1, use_sideband);
277 os->buffer[0] = os->buffer[os->used - 1];
278 os->used = 1;
279 } else {
280 send_client_data(1, os->buffer, os->used, use_sideband);
281 os->used = 0;
282 }
283
284 return readsz;
285 }
286
287 static void create_pack_file(struct upload_pack_data *pack_data,
288 const struct string_list *uri_protocols)
289 {
290 struct child_process pack_objects = CHILD_PROCESS_INIT;
291 struct output_state *output_state = xcalloc(1, sizeof(struct output_state));
292 char progress[128];
293 char abort_msg[] = "aborting due to possible repository "
294 "corruption on the remote side.";
295 ssize_t sz;
296 int i;
297 FILE *pipe_fd;
298
299 if (!pack_data->pack_objects_hook)
300 pack_objects.git_cmd = 1;
301 else {
302 strvec_push(&pack_objects.args, pack_data->pack_objects_hook);
303 strvec_push(&pack_objects.args, "git");
304 pack_objects.use_shell = 1;
305 }
306
307 if (pack_data->shallow_nr) {
308 strvec_push(&pack_objects.args, "--shallow-file");
309 strvec_push(&pack_objects.args, "");
310 }
311 strvec_push(&pack_objects.args, "pack-objects");
312 strvec_push(&pack_objects.args, "--revs");
313 if (pack_data->use_thin_pack)
314 strvec_push(&pack_objects.args, "--thin");
315
316 strvec_push(&pack_objects.args, "--stdout");
317 if (pack_data->shallow_nr)
318 strvec_push(&pack_objects.args, "--shallow");
319 if (!pack_data->no_progress)
320 strvec_push(&pack_objects.args, "--progress");
321 if (pack_data->use_ofs_delta)
322 strvec_push(&pack_objects.args, "--delta-base-offset");
323 if (pack_data->use_include_tag)
324 strvec_push(&pack_objects.args, "--include-tag");
325 if (pack_data->filter_options.choice) {
326 const char *spec =
327 expand_list_objects_filter_spec(&pack_data->filter_options);
328 strvec_pushf(&pack_objects.args, "--filter=%s", spec);
329 }
330 if (uri_protocols) {
331 for (i = 0; i < uri_protocols->nr; i++)
332 strvec_pushf(&pack_objects.args, "--uri-protocol=%s",
333 uri_protocols->items[i].string);
334 }
335
336 pack_objects.in = -1;
337 pack_objects.out = -1;
338 pack_objects.err = -1;
339 pack_objects.clean_on_exit = 1;
340
341 if (start_command(&pack_objects))
342 die("git upload-pack: unable to fork git-pack-objects");
343
344 pipe_fd = xfdopen(pack_objects.in, "w");
345
346 if (pack_data->shallow_nr)
347 for_each_commit_graft(write_one_shallow, pipe_fd);
348
349 for (i = 0; i < pack_data->want_obj.nr; i++)
350 fprintf(pipe_fd, "%s\n",
351 oid_to_hex(&pack_data->want_obj.objects[i].item->oid));
352 fprintf(pipe_fd, "--not\n");
353 for (i = 0; i < pack_data->have_obj.nr; i++)
354 fprintf(pipe_fd, "%s\n",
355 oid_to_hex(&pack_data->have_obj.objects[i].item->oid));
356 for (i = 0; i < pack_data->extra_edge_obj.nr; i++)
357 fprintf(pipe_fd, "%s\n",
358 oid_to_hex(&pack_data->extra_edge_obj.objects[i].item->oid));
359 fprintf(pipe_fd, "\n");
360 fflush(pipe_fd);
361 fclose(pipe_fd);
362
363 /* We read from pack_objects.err to capture stderr output for
364 * progress bar, and pack_objects.out to capture the pack data.
365 */
366
367 while (1) {
368 struct pollfd pfd[2];
369 int pe, pu, pollsize, polltimeout;
370 int ret;
371
372 reset_timeout(pack_data->timeout);
373
374 pollsize = 0;
375 pe = pu = -1;
376
377 if (0 <= pack_objects.out) {
378 pfd[pollsize].fd = pack_objects.out;
379 pfd[pollsize].events = POLLIN;
380 pu = pollsize;
381 pollsize++;
382 }
383 if (0 <= pack_objects.err) {
384 pfd[pollsize].fd = pack_objects.err;
385 pfd[pollsize].events = POLLIN;
386 pe = pollsize;
387 pollsize++;
388 }
389
390 if (!pollsize)
391 break;
392
393 polltimeout = pack_data->keepalive < 0
394 ? -1
395 : 1000 * pack_data->keepalive;
396
397 ret = poll(pfd, pollsize, polltimeout);
398
399 if (ret < 0) {
400 if (errno != EINTR) {
401 error_errno("poll failed, resuming");
402 sleep(1);
403 }
404 continue;
405 }
406 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
407 /* Status ready; we ship that in the side-band
408 * or dump to the standard error.
409 */
410 sz = xread(pack_objects.err, progress,
411 sizeof(progress));
412 if (0 < sz)
413 send_client_data(2, progress, sz,
414 pack_data->use_sideband);
415 else if (sz == 0) {
416 close(pack_objects.err);
417 pack_objects.err = -1;
418 }
419 else
420 goto fail;
421 /* give priority to status messages */
422 continue;
423 }
424 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
425 int result = relay_pack_data(pack_objects.out,
426 output_state,
427 pack_data->use_sideband,
428 !!uri_protocols);
429
430 if (result == 0) {
431 close(pack_objects.out);
432 pack_objects.out = -1;
433 } else if (result < 0) {
434 goto fail;
435 }
436 }
437
438 /*
439 * We hit the keepalive timeout without saying anything; send
440 * an empty message on the data sideband just to let the other
441 * side know we're still working on it, but don't have any data
442 * yet.
443 *
444 * If we don't have a sideband channel, there's no room in the
445 * protocol to say anything, so those clients are just out of
446 * luck.
447 */
448 if (!ret && pack_data->use_sideband) {
449 static const char buf[] = "0005\1";
450 write_or_die(1, buf, 5);
451 }
452 }
453
454 if (finish_command(&pack_objects)) {
455 error("git upload-pack: git-pack-objects died with error.");
456 goto fail;
457 }
458
459 /* flush the data */
460 if (output_state->used > 0) {
461 send_client_data(1, output_state->buffer, output_state->used,
462 pack_data->use_sideband);
463 fprintf(stderr, "flushed.\n");
464 }
465 free(output_state);
466 if (pack_data->use_sideband)
467 packet_flush(1);
468 return;
469
470 fail:
471 free(output_state);
472 send_client_data(3, abort_msg, sizeof(abort_msg),
473 pack_data->use_sideband);
474 die("git upload-pack: %s", abort_msg);
475 }
476
477 static int do_got_oid(struct upload_pack_data *data, const struct object_id *oid)
478 {
479 int we_knew_they_have = 0;
480 struct object *o = parse_object(the_repository, oid);
481
482 if (!o)
483 die("oops (%s)", oid_to_hex(oid));
484 if (o->type == OBJ_COMMIT) {
485 struct commit_list *parents;
486 struct commit *commit = (struct commit *)o;
487 if (o->flags & THEY_HAVE)
488 we_knew_they_have = 1;
489 else
490 o->flags |= THEY_HAVE;
491 if (!data->oldest_have || (commit->date < data->oldest_have))
492 data->oldest_have = commit->date;
493 for (parents = commit->parents;
494 parents;
495 parents = parents->next)
496 parents->item->object.flags |= THEY_HAVE;
497 }
498 if (!we_knew_they_have) {
499 add_object_array(o, NULL, &data->have_obj);
500 return 1;
501 }
502 return 0;
503 }
504
505 static int got_oid(struct upload_pack_data *data,
506 const char *hex, struct object_id *oid)
507 {
508 if (get_oid_hex(hex, oid))
509 die("git upload-pack: expected SHA1 object, got '%s'", hex);
510 if (!repo_has_object_file_with_flags(the_repository, oid,
511 OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
512 return -1;
513 return do_got_oid(data, oid);
514 }
515
516 static int ok_to_give_up(struct upload_pack_data *data)
517 {
518 timestamp_t min_generation = GENERATION_NUMBER_ZERO;
519
520 if (!data->have_obj.nr)
521 return 0;
522
523 return can_all_from_reach_with_flag(&data->want_obj, THEY_HAVE,
524 COMMON_KNOWN, data->oldest_have,
525 min_generation);
526 }
527
528 static int get_common_commits(struct upload_pack_data *data,
529 struct packet_reader *reader)
530 {
531 struct object_id oid;
532 char last_hex[GIT_MAX_HEXSZ + 1];
533 int got_common = 0;
534 int got_other = 0;
535 int sent_ready = 0;
536
537 save_commit_buffer = 0;
538
539 for (;;) {
540 const char *arg;
541
542 reset_timeout(data->timeout);
543
544 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
545 if (data->multi_ack == MULTI_ACK_DETAILED
546 && got_common
547 && !got_other
548 && ok_to_give_up(data)) {
549 sent_ready = 1;
550 packet_write_fmt(1, "ACK %s ready\n", last_hex);
551 }
552 if (data->have_obj.nr == 0 || data->multi_ack)
553 packet_write_fmt(1, "NAK\n");
554
555 if (data->no_done && sent_ready) {
556 packet_write_fmt(1, "ACK %s\n", last_hex);
557 return 0;
558 }
559 if (data->stateless_rpc)
560 exit(0);
561 got_common = 0;
562 got_other = 0;
563 continue;
564 }
565 if (skip_prefix(reader->line, "have ", &arg)) {
566 switch (got_oid(data, arg, &oid)) {
567 case -1: /* they have what we do not */
568 got_other = 1;
569 if (data->multi_ack
570 && ok_to_give_up(data)) {
571 const char *hex = oid_to_hex(&oid);
572 if (data->multi_ack == MULTI_ACK_DETAILED) {
573 sent_ready = 1;
574 packet_write_fmt(1, "ACK %s ready\n", hex);
575 } else
576 packet_write_fmt(1, "ACK %s continue\n", hex);
577 }
578 break;
579 default:
580 got_common = 1;
581 oid_to_hex_r(last_hex, &oid);
582 if (data->multi_ack == MULTI_ACK_DETAILED)
583 packet_write_fmt(1, "ACK %s common\n", last_hex);
584 else if (data->multi_ack)
585 packet_write_fmt(1, "ACK %s continue\n", last_hex);
586 else if (data->have_obj.nr == 1)
587 packet_write_fmt(1, "ACK %s\n", last_hex);
588 break;
589 }
590 continue;
591 }
592 if (!strcmp(reader->line, "done")) {
593 if (data->have_obj.nr > 0) {
594 if (data->multi_ack)
595 packet_write_fmt(1, "ACK %s\n", last_hex);
596 return 0;
597 }
598 packet_write_fmt(1, "NAK\n");
599 return -1;
600 }
601 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
602 }
603 }
604
605 static int allow_hidden_refs(enum allow_uor allow_uor)
606 {
607 if ((allow_uor & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1)
608 return 1;
609 return !(allow_uor & (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
610 }
611
612 static void for_each_namespaced_ref_1(each_ref_fn fn,
613 struct upload_pack_data *data)
614 {
615 const char **excludes = NULL;
616 /*
617 * If `data->allow_uor` allows fetching hidden refs, we need to
618 * mark all references (including hidden ones), to check in
619 * `is_our_ref()` below.
620 *
621 * Otherwise, we only care about whether each reference's object
622 * has the OUR_REF bit set or not, so do not need to visit
623 * hidden references.
624 */
625 if (allow_hidden_refs(data->allow_uor))
626 excludes = hidden_refs_to_excludes(&data->hidden_refs);
627
628 for_each_namespaced_ref(excludes, fn, data);
629 }
630
631
632 static int is_our_ref(struct object *o, enum allow_uor allow_uor)
633 {
634 return o->flags & ((allow_hidden_refs(allow_uor) ? 0 : HIDDEN_REF) | OUR_REF);
635 }
636
637 /*
638 * on successful case, it's up to the caller to close cmd->out
639 */
640 static int do_reachable_revlist(struct child_process *cmd,
641 struct object_array *src,
642 struct object_array *reachable,
643 enum allow_uor allow_uor)
644 {
645 struct object *o;
646 FILE *cmd_in = NULL;
647 int i;
648
649 strvec_pushl(&cmd->args, "rev-list", "--stdin", NULL);
650 cmd->git_cmd = 1;
651 cmd->no_stderr = 1;
652 cmd->in = -1;
653 cmd->out = -1;
654
655 /*
656 * If the next rev-list --stdin encounters an unknown commit,
657 * it terminates, which will cause SIGPIPE in the write loop
658 * below.
659 */
660 sigchain_push(SIGPIPE, SIG_IGN);
661
662 if (start_command(cmd))
663 goto error;
664
665 cmd_in = xfdopen(cmd->in, "w");
666
667 for (i = get_max_object_index(); 0 < i; ) {
668 o = get_indexed_object(--i);
669 if (!o)
670 continue;
671 if (reachable && o->type == OBJ_COMMIT)
672 o->flags &= ~TMP_MARK;
673 if (!is_our_ref(o, allow_uor))
674 continue;
675 if (fprintf(cmd_in, "^%s\n", oid_to_hex(&o->oid)) < 0)
676 goto error;
677 }
678 for (i = 0; i < src->nr; i++) {
679 o = src->objects[i].item;
680 if (is_our_ref(o, allow_uor)) {
681 if (reachable)
682 add_object_array(o, NULL, reachable);
683 continue;
684 }
685 if (reachable && o->type == OBJ_COMMIT)
686 o->flags |= TMP_MARK;
687 if (fprintf(cmd_in, "%s\n", oid_to_hex(&o->oid)) < 0)
688 goto error;
689 }
690 if (ferror(cmd_in) || fflush(cmd_in))
691 goto error;
692 fclose(cmd_in);
693 cmd->in = -1;
694 sigchain_pop(SIGPIPE);
695
696 return 0;
697
698 error:
699 sigchain_pop(SIGPIPE);
700
701 if (cmd_in)
702 fclose(cmd_in);
703 if (cmd->out >= 0)
704 close(cmd->out);
705 return -1;
706 }
707
708 static int get_reachable_list(struct upload_pack_data *data,
709 struct object_array *reachable)
710 {
711 struct child_process cmd = CHILD_PROCESS_INIT;
712 int i;
713 struct object *o;
714 char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
715 const unsigned hexsz = the_hash_algo->hexsz;
716
717 if (do_reachable_revlist(&cmd, &data->shallows, reachable,
718 data->allow_uor) < 0)
719 return -1;
720
721 while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
722 struct object_id oid;
723 const char *p;
724
725 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
726 break;
727
728 o = lookup_object(the_repository, &oid);
729 if (o && o->type == OBJ_COMMIT) {
730 o->flags &= ~TMP_MARK;
731 }
732 }
733 for (i = get_max_object_index(); 0 < i; i--) {
734 o = get_indexed_object(i - 1);
735 if (o && o->type == OBJ_COMMIT &&
736 (o->flags & TMP_MARK)) {
737 add_object_array(o, NULL, reachable);
738 o->flags &= ~TMP_MARK;
739 }
740 }
741 close(cmd.out);
742
743 if (finish_command(&cmd))
744 return -1;
745
746 return 0;
747 }
748
749 static int has_unreachable(struct object_array *src, enum allow_uor allow_uor)
750 {
751 struct child_process cmd = CHILD_PROCESS_INIT;
752 char buf[1];
753 int i;
754
755 if (do_reachable_revlist(&cmd, src, NULL, allow_uor) < 0)
756 return 1;
757
758 /*
759 * The commits out of the rev-list are not ancestors of
760 * our ref.
761 */
762 i = read_in_full(cmd.out, buf, 1);
763 if (i)
764 goto error;
765 close(cmd.out);
766 cmd.out = -1;
767
768 /*
769 * rev-list may have died by encountering a bad commit
770 * in the history, in which case we do want to bail out
771 * even when it showed no commit.
772 */
773 if (finish_command(&cmd))
774 goto error;
775
776 /* All the non-tip ones are ancestors of what we advertised */
777 return 0;
778
779 error:
780 if (cmd.out >= 0)
781 close(cmd.out);
782 return 1;
783 }
784
785 static void check_non_tip(struct upload_pack_data *data)
786 {
787 int i;
788
789 /*
790 * In the normal in-process case without
791 * uploadpack.allowReachableSHA1InWant,
792 * non-tip requests can never happen.
793 */
794 if (!data->stateless_rpc && !(data->allow_uor & ALLOW_REACHABLE_SHA1))
795 goto error;
796 if (!has_unreachable(&data->want_obj, data->allow_uor))
797 /* All the non-tip ones are ancestors of what we advertised */
798 return;
799
800 error:
801 /* Pick one of them (we know there at least is one) */
802 for (i = 0; i < data->want_obj.nr; i++) {
803 struct object *o = data->want_obj.objects[i].item;
804 if (!is_our_ref(o, data->allow_uor)) {
805 packet_writer_error(&data->writer,
806 "upload-pack: not our ref %s",
807 oid_to_hex(&o->oid));
808 die("git upload-pack: not our ref %s",
809 oid_to_hex(&o->oid));
810 }
811 }
812 }
813
814 static void send_shallow(struct upload_pack_data *data,
815 struct commit_list *result)
816 {
817 while (result) {
818 struct object *object = &result->item->object;
819 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
820 packet_writer_write(&data->writer, "shallow %s",
821 oid_to_hex(&object->oid));
822 register_shallow(the_repository, &object->oid);
823 data->shallow_nr++;
824 }
825 result = result->next;
826 }
827 }
828
829 static void send_unshallow(struct upload_pack_data *data)
830 {
831 int i;
832
833 for (i = 0; i < data->shallows.nr; i++) {
834 struct object *object = data->shallows.objects[i].item;
835 if (object->flags & NOT_SHALLOW) {
836 struct commit_list *parents;
837 packet_writer_write(&data->writer, "unshallow %s",
838 oid_to_hex(&object->oid));
839 object->flags &= ~CLIENT_SHALLOW;
840 /*
841 * We want to _register_ "object" as shallow, but we
842 * also need to traverse object's parents to deepen a
843 * shallow clone. Unregister it for now so we can
844 * parse and add the parents to the want list, then
845 * re-register it.
846 */
847 unregister_shallow(&object->oid);
848 object->parsed = 0;
849 parse_commit_or_die((struct commit *)object);
850 parents = ((struct commit *)object)->parents;
851 while (parents) {
852 add_object_array(&parents->item->object,
853 NULL, &data->want_obj);
854 parents = parents->next;
855 }
856 add_object_array(object, NULL, &data->extra_edge_obj);
857 }
858 /* make sure commit traversal conforms to client */
859 register_shallow(the_repository, &object->oid);
860 }
861 }
862
863 static int check_ref(const char *refname_full, const struct object_id *oid,
864 int flag, void *cb_data);
865 static void deepen(struct upload_pack_data *data, int depth)
866 {
867 if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
868 int i;
869
870 for (i = 0; i < data->shallows.nr; i++) {
871 struct object *object = data->shallows.objects[i].item;
872 object->flags |= NOT_SHALLOW;
873 }
874 } else if (data->deepen_relative) {
875 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
876 struct commit_list *result;
877
878 /*
879 * Checking for reachable shallows requires that our refs be
880 * marked with OUR_REF.
881 */
882 head_ref_namespaced(check_ref, data);
883 for_each_namespaced_ref_1(check_ref, data);
884
885 get_reachable_list(data, &reachable_shallows);
886 result = get_shallow_commits(&reachable_shallows,
887 depth + 1,
888 SHALLOW, NOT_SHALLOW);
889 send_shallow(data, result);
890 free_commit_list(result);
891 object_array_clear(&reachable_shallows);
892 } else {
893 struct commit_list *result;
894
895 result = get_shallow_commits(&data->want_obj, depth,
896 SHALLOW, NOT_SHALLOW);
897 send_shallow(data, result);
898 free_commit_list(result);
899 }
900
901 send_unshallow(data);
902 }
903
904 static void deepen_by_rev_list(struct upload_pack_data *data,
905 int ac,
906 const char **av)
907 {
908 struct commit_list *result;
909
910 disable_commit_graph(the_repository);
911 result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
912 send_shallow(data, result);
913 free_commit_list(result);
914 send_unshallow(data);
915 }
916
917 /* Returns 1 if a shallow list is sent or 0 otherwise */
918 static int send_shallow_list(struct upload_pack_data *data)
919 {
920 int ret = 0;
921
922 if (data->depth > 0 && data->deepen_rev_list)
923 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
924 if (data->depth > 0) {
925 deepen(data, data->depth);
926 ret = 1;
927 } else if (data->deepen_rev_list) {
928 struct strvec av = STRVEC_INIT;
929 int i;
930
931 strvec_push(&av, "rev-list");
932 if (data->deepen_since)
933 strvec_pushf(&av, "--max-age=%"PRItime, data->deepen_since);
934 if (data->deepen_not.nr) {
935 strvec_push(&av, "--not");
936 for (i = 0; i < data->deepen_not.nr; i++) {
937 struct string_list_item *s = data->deepen_not.items + i;
938 strvec_push(&av, s->string);
939 }
940 strvec_push(&av, "--not");
941 }
942 for (i = 0; i < data->want_obj.nr; i++) {
943 struct object *o = data->want_obj.objects[i].item;
944 strvec_push(&av, oid_to_hex(&o->oid));
945 }
946 deepen_by_rev_list(data, av.nr, av.v);
947 strvec_clear(&av);
948 ret = 1;
949 } else {
950 if (data->shallows.nr > 0) {
951 int i;
952 for (i = 0; i < data->shallows.nr; i++)
953 register_shallow(the_repository,
954 &data->shallows.objects[i].item->oid);
955 }
956 }
957
958 data->shallow_nr += data->shallows.nr;
959 return ret;
960 }
961
962 static int process_shallow(const char *line, struct object_array *shallows)
963 {
964 const char *arg;
965 if (skip_prefix(line, "shallow ", &arg)) {
966 struct object_id oid;
967 struct object *object;
968 if (get_oid_hex(arg, &oid))
969 die("invalid shallow line: %s", line);
970 object = parse_object(the_repository, &oid);
971 if (!object)
972 return 1;
973 if (object->type != OBJ_COMMIT)
974 die("invalid shallow object %s", oid_to_hex(&oid));
975 if (!(object->flags & CLIENT_SHALLOW)) {
976 object->flags |= CLIENT_SHALLOW;
977 add_object_array(object, NULL, shallows);
978 }
979 return 1;
980 }
981
982 return 0;
983 }
984
985 static int process_deepen(const char *line, int *depth)
986 {
987 const char *arg;
988 if (skip_prefix(line, "deepen ", &arg)) {
989 char *end = NULL;
990 *depth = (int)strtol(arg, &end, 0);
991 if (!end || *end || *depth <= 0)
992 die("Invalid deepen: %s", line);
993 return 1;
994 }
995
996 return 0;
997 }
998
999 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
1000 {
1001 const char *arg;
1002 if (skip_prefix(line, "deepen-since ", &arg)) {
1003 char *end = NULL;
1004 *deepen_since = parse_timestamp(arg, &end, 0);
1005 if (!end || *end || !deepen_since ||
1006 /* revisions.c's max_age -1 is special */
1007 *deepen_since == -1)
1008 die("Invalid deepen-since: %s", line);
1009 *deepen_rev_list = 1;
1010 return 1;
1011 }
1012 return 0;
1013 }
1014
1015 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
1016 {
1017 const char *arg;
1018 if (skip_prefix(line, "deepen-not ", &arg)) {
1019 char *ref = NULL;
1020 struct object_id oid;
1021 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
1022 die("git upload-pack: ambiguous deepen-not: %s", line);
1023 string_list_append(deepen_not, ref);
1024 free(ref);
1025 *deepen_rev_list = 1;
1026 return 1;
1027 }
1028 return 0;
1029 }
1030
1031 NORETURN __attribute__((format(printf,2,3)))
1032 static void send_err_and_die(struct upload_pack_data *data,
1033 const char *fmt, ...)
1034 {
1035 struct strbuf buf = STRBUF_INIT;
1036 va_list ap;
1037
1038 va_start(ap, fmt);
1039 strbuf_vaddf(&buf, fmt, ap);
1040 va_end(ap);
1041
1042 packet_writer_error(&data->writer, "%s", buf.buf);
1043 die("%s", buf.buf);
1044 }
1045
1046 static void check_one_filter(struct upload_pack_data *data,
1047 struct list_objects_filter_options *opts)
1048 {
1049 const char *key = list_object_filter_config_name(opts->choice);
1050 struct string_list_item *item = string_list_lookup(&data->allowed_filters,
1051 key);
1052 int allowed;
1053
1054 if (item)
1055 allowed = (intptr_t)item->util;
1056 else
1057 allowed = data->allow_filter_fallback;
1058
1059 if (!allowed)
1060 send_err_and_die(data, "filter '%s' not supported", key);
1061
1062 if (opts->choice == LOFC_TREE_DEPTH &&
1063 opts->tree_exclude_depth > data->tree_filter_max_depth)
1064 send_err_and_die(data,
1065 "tree filter allows max depth %lu, but got %lu",
1066 data->tree_filter_max_depth,
1067 opts->tree_exclude_depth);
1068 }
1069
1070 static void check_filter_recurse(struct upload_pack_data *data,
1071 struct list_objects_filter_options *opts)
1072 {
1073 size_t i;
1074
1075 check_one_filter(data, opts);
1076 if (opts->choice != LOFC_COMBINE)
1077 return;
1078
1079 for (i = 0; i < opts->sub_nr; i++)
1080 check_filter_recurse(data, &opts->sub[i]);
1081 }
1082
1083 static void die_if_using_banned_filter(struct upload_pack_data *data)
1084 {
1085 check_filter_recurse(data, &data->filter_options);
1086 }
1087
1088 static void receive_needs(struct upload_pack_data *data,
1089 struct packet_reader *reader)
1090 {
1091 int has_non_tip = 0;
1092
1093 data->shallow_nr = 0;
1094 for (;;) {
1095 struct object *o;
1096 const char *features;
1097 struct object_id oid_buf;
1098 const char *arg;
1099 size_t feature_len;
1100
1101 reset_timeout(data->timeout);
1102 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
1103 break;
1104
1105 if (process_shallow(reader->line, &data->shallows))
1106 continue;
1107 if (process_deepen(reader->line, &data->depth))
1108 continue;
1109 if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
1110 continue;
1111 if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
1112 continue;
1113
1114 if (skip_prefix(reader->line, "filter ", &arg)) {
1115 if (!data->filter_capability_requested)
1116 die("git upload-pack: filtering capability not negotiated");
1117 list_objects_filter_die_if_populated(&data->filter_options);
1118 parse_list_objects_filter(&data->filter_options, arg);
1119 die_if_using_banned_filter(data);
1120 continue;
1121 }
1122
1123 if (!skip_prefix(reader->line, "want ", &arg) ||
1124 parse_oid_hex(arg, &oid_buf, &features))
1125 die("git upload-pack: protocol error, "
1126 "expected to get object ID, not '%s'", reader->line);
1127
1128 if (parse_feature_request(features, "deepen-relative"))
1129 data->deepen_relative = 1;
1130 if (parse_feature_request(features, "multi_ack_detailed"))
1131 data->multi_ack = MULTI_ACK_DETAILED;
1132 else if (parse_feature_request(features, "multi_ack"))
1133 data->multi_ack = MULTI_ACK;
1134 if (parse_feature_request(features, "no-done"))
1135 data->no_done = 1;
1136 if (parse_feature_request(features, "thin-pack"))
1137 data->use_thin_pack = 1;
1138 if (parse_feature_request(features, "ofs-delta"))
1139 data->use_ofs_delta = 1;
1140 if (parse_feature_request(features, "side-band-64k"))
1141 data->use_sideband = LARGE_PACKET_MAX;
1142 else if (parse_feature_request(features, "side-band"))
1143 data->use_sideband = DEFAULT_PACKET_MAX;
1144 if (parse_feature_request(features, "no-progress"))
1145 data->no_progress = 1;
1146 if (parse_feature_request(features, "include-tag"))
1147 data->use_include_tag = 1;
1148 if (data->allow_filter &&
1149 parse_feature_request(features, "filter"))
1150 data->filter_capability_requested = 1;
1151
1152 arg = parse_feature_value(features, "session-id", &feature_len, NULL);
1153 if (arg) {
1154 char *client_sid = xstrndup(arg, feature_len);
1155 trace2_data_string("transfer", NULL, "client-sid", client_sid);
1156 free(client_sid);
1157 }
1158
1159 o = parse_object(the_repository, &oid_buf);
1160 if (!o) {
1161 packet_writer_error(&data->writer,
1162 "upload-pack: not our ref %s",
1163 oid_to_hex(&oid_buf));
1164 die("git upload-pack: not our ref %s",
1165 oid_to_hex(&oid_buf));
1166 }
1167 if (!(o->flags & WANTED)) {
1168 o->flags |= WANTED;
1169 if (!((data->allow_uor & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
1170 || is_our_ref(o, data->allow_uor)))
1171 has_non_tip = 1;
1172 add_object_array(o, NULL, &data->want_obj);
1173 }
1174 }
1175
1176 /*
1177 * We have sent all our refs already, and the other end
1178 * should have chosen out of them. When we are operating
1179 * in the stateless RPC mode, however, their choice may
1180 * have been based on the set of older refs advertised
1181 * by another process that handled the initial request.
1182 */
1183 if (has_non_tip)
1184 check_non_tip(data);
1185
1186 if (!data->use_sideband && data->daemon_mode)
1187 data->no_progress = 1;
1188
1189 if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1190 return;
1191
1192 if (send_shallow_list(data))
1193 packet_flush(1);
1194 }
1195
1196 /* return non-zero if the ref is hidden, otherwise 0 */
1197 static int mark_our_ref(const char *refname, const char *refname_full,
1198 const struct object_id *oid, const struct strvec *hidden_refs)
1199 {
1200 struct object *o = lookup_unknown_object(the_repository, oid);
1201
1202 if (ref_is_hidden(refname, refname_full, hidden_refs)) {
1203 o->flags |= HIDDEN_REF;
1204 return 1;
1205 }
1206 o->flags |= OUR_REF;
1207 return 0;
1208 }
1209
1210 static int check_ref(const char *refname_full, const struct object_id *oid,
1211 int flag UNUSED, void *cb_data)
1212 {
1213 const char *refname = strip_namespace(refname_full);
1214 struct upload_pack_data *data = cb_data;
1215
1216 mark_our_ref(refname, refname_full, oid, &data->hidden_refs);
1217 return 0;
1218 }
1219
1220 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1221 {
1222 struct string_list_item *item;
1223
1224 if (!symref->nr)
1225 return;
1226 for_each_string_list_item(item, symref)
1227 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1228 }
1229
1230 static void format_session_id(struct strbuf *buf, struct upload_pack_data *d) {
1231 if (d->advertise_sid)
1232 strbuf_addf(buf, " session-id=%s", trace2_session_id());
1233 }
1234
1235 static void write_v0_ref(struct upload_pack_data *data,
1236 const char *refname, const char *refname_nons,
1237 const struct object_id *oid)
1238 {
1239 static const char *capabilities = "multi_ack thin-pack side-band"
1240 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1241 " deepen-relative no-progress include-tag multi_ack_detailed";
1242 struct object_id peeled;
1243
1244 if (mark_our_ref(refname_nons, refname, oid, &data->hidden_refs))
1245 return;
1246
1247 if (capabilities) {
1248 struct strbuf symref_info = STRBUF_INIT;
1249 struct strbuf session_id = STRBUF_INIT;
1250
1251 format_symref_info(&symref_info, &data->symref);
1252 format_session_id(&session_id, data);
1253 packet_fwrite_fmt(stdout, "%s %s%c%s%s%s%s%s%s%s object-format=%s agent=%s\n",
1254 oid_to_hex(oid), refname_nons,
1255 0, capabilities,
1256 (data->allow_uor & ALLOW_TIP_SHA1) ?
1257 " allow-tip-sha1-in-want" : "",
1258 (data->allow_uor & ALLOW_REACHABLE_SHA1) ?
1259 " allow-reachable-sha1-in-want" : "",
1260 data->no_done ? " no-done" : "",
1261 symref_info.buf,
1262 data->allow_filter ? " filter" : "",
1263 session_id.buf,
1264 the_hash_algo->name,
1265 git_user_agent_sanitized());
1266 strbuf_release(&symref_info);
1267 strbuf_release(&session_id);
1268 data->sent_capabilities = 1;
1269 } else {
1270 packet_fwrite_fmt(stdout, "%s %s\n", oid_to_hex(oid), refname_nons);
1271 }
1272 capabilities = NULL;
1273 if (!peel_iterated_oid(oid, &peeled))
1274 packet_fwrite_fmt(stdout, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1275 return;
1276 }
1277
1278 static int send_ref(const char *refname, const struct object_id *oid,
1279 int flag UNUSED, void *cb_data)
1280 {
1281 write_v0_ref(cb_data, refname, strip_namespace(refname), oid);
1282 return 0;
1283 }
1284
1285 static int find_symref(const char *refname,
1286 const struct object_id *oid UNUSED,
1287 int flag, void *cb_data)
1288 {
1289 const char *symref_target;
1290 struct string_list_item *item;
1291
1292 if ((flag & REF_ISSYMREF) == 0)
1293 return 0;
1294 symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1295 if (!symref_target || (flag & REF_ISSYMREF) == 0)
1296 die("'%s' is a symref but it is not?", refname);
1297 item = string_list_append(cb_data, strip_namespace(refname));
1298 item->util = xstrdup(strip_namespace(symref_target));
1299 return 0;
1300 }
1301
1302 static int parse_object_filter_config(const char *var, const char *value,
1303 struct upload_pack_data *data)
1304 {
1305 struct strbuf buf = STRBUF_INIT;
1306 const char *sub, *key;
1307 size_t sub_len;
1308
1309 if (parse_config_key(var, "uploadpackfilter", &sub, &sub_len, &key))
1310 return 0;
1311
1312 if (!sub) {
1313 if (!strcmp(key, "allow"))
1314 data->allow_filter_fallback = git_config_bool(var, value);
1315 return 0;
1316 }
1317
1318 strbuf_add(&buf, sub, sub_len);
1319
1320 if (!strcmp(key, "allow"))
1321 string_list_insert(&data->allowed_filters, buf.buf)->util =
1322 (void *)(intptr_t)git_config_bool(var, value);
1323 else if (!strcmp(buf.buf, "tree") && !strcmp(key, "maxdepth")) {
1324 if (!value) {
1325 strbuf_release(&buf);
1326 return config_error_nonbool(var);
1327 }
1328 string_list_insert(&data->allowed_filters, buf.buf)->util =
1329 (void *)(intptr_t)1;
1330 data->tree_filter_max_depth = git_config_ulong(var, value);
1331 }
1332
1333 strbuf_release(&buf);
1334 return 0;
1335 }
1336
1337 static int upload_pack_config(const char *var, const char *value, void *cb_data)
1338 {
1339 struct upload_pack_data *data = cb_data;
1340
1341 if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1342 if (git_config_bool(var, value))
1343 data->allow_uor |= ALLOW_TIP_SHA1;
1344 else
1345 data->allow_uor &= ~ALLOW_TIP_SHA1;
1346 } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1347 if (git_config_bool(var, value))
1348 data->allow_uor |= ALLOW_REACHABLE_SHA1;
1349 else
1350 data->allow_uor &= ~ALLOW_REACHABLE_SHA1;
1351 } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1352 if (git_config_bool(var, value))
1353 data->allow_uor |= ALLOW_ANY_SHA1;
1354 else
1355 data->allow_uor &= ~ALLOW_ANY_SHA1;
1356 } else if (!strcmp("uploadpack.keepalive", var)) {
1357 data->keepalive = git_config_int(var, value);
1358 if (!data->keepalive)
1359 data->keepalive = -1;
1360 } else if (!strcmp("uploadpack.allowfilter", var)) {
1361 data->allow_filter = git_config_bool(var, value);
1362 } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1363 data->allow_ref_in_want = git_config_bool(var, value);
1364 } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1365 data->allow_sideband_all = git_config_bool(var, value);
1366 } else if (!strcmp("core.precomposeunicode", var)) {
1367 precomposed_unicode = git_config_bool(var, value);
1368 } else if (!strcmp("transfer.advertisesid", var)) {
1369 data->advertise_sid = git_config_bool(var, value);
1370 }
1371
1372 if (parse_object_filter_config(var, value, data) < 0)
1373 return -1;
1374
1375 return parse_hide_refs_config(var, value, "uploadpack", &data->hidden_refs);
1376 }
1377
1378 static int upload_pack_protected_config(const char *var, const char *value, void *cb_data)
1379 {
1380 struct upload_pack_data *data = cb_data;
1381
1382 if (!strcmp("uploadpack.packobjectshook", var))
1383 return git_config_string(&data->pack_objects_hook, var, value);
1384 return 0;
1385 }
1386
1387 static void get_upload_pack_config(struct upload_pack_data *data)
1388 {
1389 git_config(upload_pack_config, data);
1390 git_protected_config(upload_pack_protected_config, data);
1391 }
1392
1393 void upload_pack(const int advertise_refs, const int stateless_rpc,
1394 const int timeout)
1395 {
1396 struct packet_reader reader;
1397 struct upload_pack_data data;
1398
1399 upload_pack_data_init(&data);
1400 get_upload_pack_config(&data);
1401
1402 data.stateless_rpc = stateless_rpc;
1403 data.timeout = timeout;
1404 if (data.timeout)
1405 data.daemon_mode = 1;
1406
1407 head_ref_namespaced(find_symref, &data.symref);
1408
1409 if (advertise_refs || !data.stateless_rpc) {
1410 reset_timeout(data.timeout);
1411 if (advertise_refs)
1412 data.no_done = 1;
1413 head_ref_namespaced(send_ref, &data);
1414 for_each_namespaced_ref_1(send_ref, &data);
1415 if (!data.sent_capabilities) {
1416 const char *refname = "capabilities^{}";
1417 write_v0_ref(&data, refname, refname, null_oid());
1418 }
1419 /*
1420 * fflush stdout before calling advertise_shallow_grafts because send_ref
1421 * uses stdio.
1422 */
1423 fflush_or_die(stdout);
1424 advertise_shallow_grafts(1);
1425 packet_flush(1);
1426 } else {
1427 head_ref_namespaced(check_ref, &data);
1428 for_each_namespaced_ref_1(check_ref, &data);
1429 }
1430
1431 if (!advertise_refs) {
1432 packet_reader_init(&reader, 0, NULL, 0,
1433 PACKET_READ_CHOMP_NEWLINE |
1434 PACKET_READ_DIE_ON_ERR_PACKET);
1435
1436 receive_needs(&data, &reader);
1437
1438 /*
1439 * An EOF at this exact point in negotiation should be
1440 * acceptable from stateless clients as they will consume the
1441 * shallow list before doing subsequent rpc with haves/etc.
1442 */
1443 if (data.stateless_rpc)
1444 reader.options |= PACKET_READ_GENTLE_ON_EOF;
1445
1446 if (data.want_obj.nr &&
1447 packet_reader_peek(&reader) != PACKET_READ_EOF) {
1448 reader.options &= ~PACKET_READ_GENTLE_ON_EOF;
1449 get_common_commits(&data, &reader);
1450 create_pack_file(&data, NULL);
1451 }
1452 }
1453
1454 upload_pack_data_clear(&data);
1455 }
1456
1457 static int parse_want(struct packet_writer *writer, const char *line,
1458 struct object_array *want_obj)
1459 {
1460 const char *arg;
1461 if (skip_prefix(line, "want ", &arg)) {
1462 struct object_id oid;
1463 struct object *o;
1464
1465 if (get_oid_hex(arg, &oid))
1466 die("git upload-pack: protocol error, "
1467 "expected to get oid, not '%s'", line);
1468
1469 o = parse_object_with_flags(the_repository, &oid,
1470 PARSE_OBJECT_SKIP_HASH_CHECK);
1471
1472 if (!o) {
1473 packet_writer_error(writer,
1474 "upload-pack: not our ref %s",
1475 oid_to_hex(&oid));
1476 die("git upload-pack: not our ref %s",
1477 oid_to_hex(&oid));
1478 }
1479
1480 if (!(o->flags & WANTED)) {
1481 o->flags |= WANTED;
1482 add_object_array(o, NULL, want_obj);
1483 }
1484
1485 return 1;
1486 }
1487
1488 return 0;
1489 }
1490
1491 static int parse_want_ref(struct packet_writer *writer, const char *line,
1492 struct string_list *wanted_refs,
1493 struct strvec *hidden_refs,
1494 struct object_array *want_obj)
1495 {
1496 const char *refname_nons;
1497 if (skip_prefix(line, "want-ref ", &refname_nons)) {
1498 struct object_id oid;
1499 struct string_list_item *item;
1500 struct object *o = NULL;
1501 struct strbuf refname = STRBUF_INIT;
1502
1503 strbuf_addf(&refname, "%s%s", get_git_namespace(), refname_nons);
1504 if (ref_is_hidden(refname_nons, refname.buf, hidden_refs) ||
1505 read_ref(refname.buf, &oid)) {
1506 packet_writer_error(writer, "unknown ref %s", refname_nons);
1507 die("unknown ref %s", refname_nons);
1508 }
1509 strbuf_release(&refname);
1510
1511 item = string_list_append(wanted_refs, refname_nons);
1512 item->util = oiddup(&oid);
1513
1514 if (!starts_with(refname_nons, "refs/tags/")) {
1515 struct commit *commit = lookup_commit_in_graph(the_repository, &oid);
1516 if (commit)
1517 o = &commit->object;
1518 }
1519
1520 if (!o)
1521 o = parse_object_or_die(&oid, refname_nons);
1522
1523 if (!(o->flags & WANTED)) {
1524 o->flags |= WANTED;
1525 add_object_array(o, NULL, want_obj);
1526 }
1527
1528 return 1;
1529 }
1530
1531 return 0;
1532 }
1533
1534 static int parse_have(const char *line, struct oid_array *haves)
1535 {
1536 const char *arg;
1537 if (skip_prefix(line, "have ", &arg)) {
1538 struct object_id oid;
1539
1540 if (get_oid_hex(arg, &oid))
1541 die("git upload-pack: expected SHA1 object, got '%s'", arg);
1542 oid_array_append(haves, &oid);
1543 return 1;
1544 }
1545
1546 return 0;
1547 }
1548
1549 static void process_args(struct packet_reader *request,
1550 struct upload_pack_data *data)
1551 {
1552 while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1553 const char *arg = request->line;
1554 const char *p;
1555
1556 /* process want */
1557 if (parse_want(&data->writer, arg, &data->want_obj))
1558 continue;
1559 if (data->allow_ref_in_want &&
1560 parse_want_ref(&data->writer, arg, &data->wanted_refs,
1561 &data->hidden_refs, &data->want_obj))
1562 continue;
1563 /* process have line */
1564 if (parse_have(arg, &data->haves))
1565 continue;
1566
1567 /* process args like thin-pack */
1568 if (!strcmp(arg, "thin-pack")) {
1569 data->use_thin_pack = 1;
1570 continue;
1571 }
1572 if (!strcmp(arg, "ofs-delta")) {
1573 data->use_ofs_delta = 1;
1574 continue;
1575 }
1576 if (!strcmp(arg, "no-progress")) {
1577 data->no_progress = 1;
1578 continue;
1579 }
1580 if (!strcmp(arg, "include-tag")) {
1581 data->use_include_tag = 1;
1582 continue;
1583 }
1584 if (!strcmp(arg, "done")) {
1585 data->done = 1;
1586 continue;
1587 }
1588 if (!strcmp(arg, "wait-for-done")) {
1589 data->wait_for_done = 1;
1590 continue;
1591 }
1592
1593 /* Shallow related arguments */
1594 if (process_shallow(arg, &data->shallows))
1595 continue;
1596 if (process_deepen(arg, &data->depth))
1597 continue;
1598 if (process_deepen_since(arg, &data->deepen_since,
1599 &data->deepen_rev_list))
1600 continue;
1601 if (process_deepen_not(arg, &data->deepen_not,
1602 &data->deepen_rev_list))
1603 continue;
1604 if (!strcmp(arg, "deepen-relative")) {
1605 data->deepen_relative = 1;
1606 continue;
1607 }
1608
1609 if (data->allow_filter && skip_prefix(arg, "filter ", &p)) {
1610 list_objects_filter_die_if_populated(&data->filter_options);
1611 parse_list_objects_filter(&data->filter_options, p);
1612 die_if_using_banned_filter(data);
1613 continue;
1614 }
1615
1616 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1617 data->allow_sideband_all) &&
1618 !strcmp(arg, "sideband-all")) {
1619 data->writer.use_sideband = 1;
1620 continue;
1621 }
1622
1623 if (skip_prefix(arg, "packfile-uris ", &p)) {
1624 string_list_split(&data->uri_protocols, p, ',', -1);
1625 continue;
1626 }
1627
1628 /* ignore unknown lines maybe? */
1629 die("unexpected line: '%s'", arg);
1630 }
1631
1632 if (data->uri_protocols.nr && !data->writer.use_sideband)
1633 string_list_clear(&data->uri_protocols, 0);
1634
1635 if (request->status != PACKET_READ_FLUSH)
1636 die(_("expected flush after fetch arguments"));
1637 }
1638
1639 static int process_haves(struct upload_pack_data *data, struct oid_array *common)
1640 {
1641 int i;
1642
1643 /* Process haves */
1644 for (i = 0; i < data->haves.nr; i++) {
1645 const struct object_id *oid = &data->haves.oid[i];
1646
1647 if (!repo_has_object_file_with_flags(the_repository, oid,
1648 OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
1649 continue;
1650
1651 oid_array_append(common, oid);
1652
1653 do_got_oid(data, oid);
1654 }
1655
1656 return 0;
1657 }
1658
1659 static int send_acks(struct upload_pack_data *data, struct oid_array *acks)
1660 {
1661 int i;
1662
1663 packet_writer_write(&data->writer, "acknowledgments\n");
1664
1665 /* Send Acks */
1666 if (!acks->nr)
1667 packet_writer_write(&data->writer, "NAK\n");
1668
1669 for (i = 0; i < acks->nr; i++) {
1670 packet_writer_write(&data->writer, "ACK %s\n",
1671 oid_to_hex(&acks->oid[i]));
1672 }
1673
1674 if (!data->wait_for_done && ok_to_give_up(data)) {
1675 /* Send Ready */
1676 packet_writer_write(&data->writer, "ready\n");
1677 return 1;
1678 }
1679
1680 return 0;
1681 }
1682
1683 static int process_haves_and_send_acks(struct upload_pack_data *data)
1684 {
1685 struct oid_array common = OID_ARRAY_INIT;
1686 int ret = 0;
1687
1688 process_haves(data, &common);
1689 if (data->done) {
1690 ret = 1;
1691 } else if (send_acks(data, &common)) {
1692 packet_writer_delim(&data->writer);
1693 ret = 1;
1694 } else {
1695 /* Add Flush */
1696 packet_writer_flush(&data->writer);
1697 ret = 0;
1698 }
1699
1700 oid_array_clear(&data->haves);
1701 oid_array_clear(&common);
1702 return ret;
1703 }
1704
1705 static void send_wanted_ref_info(struct upload_pack_data *data)
1706 {
1707 const struct string_list_item *item;
1708
1709 if (!data->wanted_refs.nr)
1710 return;
1711
1712 packet_writer_write(&data->writer, "wanted-refs\n");
1713
1714 for_each_string_list_item(item, &data->wanted_refs) {
1715 packet_writer_write(&data->writer, "%s %s\n",
1716 oid_to_hex(item->util),
1717 item->string);
1718 }
1719
1720 packet_writer_delim(&data->writer);
1721 }
1722
1723 static void send_shallow_info(struct upload_pack_data *data)
1724 {
1725 /* No shallow info needs to be sent */
1726 if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1727 !is_repository_shallow(the_repository))
1728 return;
1729
1730 packet_writer_write(&data->writer, "shallow-info\n");
1731
1732 if (!send_shallow_list(data) &&
1733 is_repository_shallow(the_repository))
1734 deepen(data, INFINITE_DEPTH);
1735
1736 packet_delim(1);
1737 }
1738
1739 enum fetch_state {
1740 FETCH_PROCESS_ARGS = 0,
1741 FETCH_SEND_ACKS,
1742 FETCH_SEND_PACK,
1743 FETCH_DONE,
1744 };
1745
1746 int upload_pack_v2(struct repository *r UNUSED, struct packet_reader *request)
1747 {
1748 enum fetch_state state = FETCH_PROCESS_ARGS;
1749 struct upload_pack_data data;
1750
1751 clear_object_flags(ALL_FLAGS);
1752
1753 upload_pack_data_init(&data);
1754 data.use_sideband = LARGE_PACKET_MAX;
1755 get_upload_pack_config(&data);
1756
1757 while (state != FETCH_DONE) {
1758 switch (state) {
1759 case FETCH_PROCESS_ARGS:
1760 process_args(request, &data);
1761
1762 if (!data.want_obj.nr && !data.wait_for_done) {
1763 /*
1764 * Request didn't contain any 'want' lines (and
1765 * the request does not contain
1766 * "wait-for-done", in which it is reasonable
1767 * to just send 'have's without 'want's); guess
1768 * they didn't want anything.
1769 */
1770 state = FETCH_DONE;
1771 } else if (data.haves.nr) {
1772 /*
1773 * Request had 'have' lines, so lets ACK them.
1774 */
1775 state = FETCH_SEND_ACKS;
1776 } else {
1777 /*
1778 * Request had 'want's but no 'have's so we can
1779 * immedietly go to construct and send a pack.
1780 */
1781 state = FETCH_SEND_PACK;
1782 }
1783 break;
1784 case FETCH_SEND_ACKS:
1785 if (process_haves_and_send_acks(&data))
1786 state = FETCH_SEND_PACK;
1787 else
1788 state = FETCH_DONE;
1789 break;
1790 case FETCH_SEND_PACK:
1791 send_wanted_ref_info(&data);
1792 send_shallow_info(&data);
1793
1794 if (data.uri_protocols.nr) {
1795 create_pack_file(&data, &data.uri_protocols);
1796 } else {
1797 packet_writer_write(&data.writer, "packfile\n");
1798 create_pack_file(&data, NULL);
1799 }
1800 state = FETCH_DONE;
1801 break;
1802 case FETCH_DONE:
1803 continue;
1804 }
1805 }
1806
1807 upload_pack_data_clear(&data);
1808 return 0;
1809 }
1810
1811 int upload_pack_advertise(struct repository *r,
1812 struct strbuf *value)
1813 {
1814 if (value) {
1815 int allow_filter_value;
1816 int allow_ref_in_want;
1817 int allow_sideband_all_value;
1818 char *str = NULL;
1819
1820 strbuf_addstr(value, "shallow wait-for-done");
1821
1822 if (!repo_config_get_bool(r,
1823 "uploadpack.allowfilter",
1824 &allow_filter_value) &&
1825 allow_filter_value)
1826 strbuf_addstr(value, " filter");
1827
1828 if (!repo_config_get_bool(r,
1829 "uploadpack.allowrefinwant",
1830 &allow_ref_in_want) &&
1831 allow_ref_in_want)
1832 strbuf_addstr(value, " ref-in-want");
1833
1834 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1835 (!repo_config_get_bool(r,
1836 "uploadpack.allowsidebandall",
1837 &allow_sideband_all_value) &&
1838 allow_sideband_all_value))
1839 strbuf_addstr(value, " sideband-all");
1840
1841 if (!repo_config_get_string(r,
1842 "uploadpack.blobpackfileuri",
1843 &str) &&
1844 str) {
1845 strbuf_addstr(value, " packfile-uris");
1846 free(str);
1847 }
1848 }
1849
1850 return 1;
1851 }
Unnamed repository; edit this file 'description' to name the repository.