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upload-pack: only accept packfile-uris if we advertised it
[git/gitster.git] / upload-pack.c
blob66f4de9d8723a088e02232ee3723fa0758cd6af7
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-ll.h"
11 #include "oid-array.h"
12 #include "object.h"
13 #include "commit.h"
14 #include "diff.h"
15 #include "revision.h"
16 #include "list-objects-filter-options.h"
17 #include "run-command.h"
18 #include "connect.h"
19 #include "sigchain.h"
20 #include "version.h"
21 #include "string-list.h"
22 #include "strvec.h"
23 #include "trace2.h"
24 #include "protocol.h"
25 #include "upload-pack.h"
26 #include "commit-graph.h"
27 #include "commit-reach.h"
28 #include "shallow.h"
29 #include "write-or-die.h"
30 #include "json-writer.h"
31
32 /* Remember to update object flag allocation in object.h */
33 #define THEY_HAVE (1u << 11)
34 #define OUR_REF (1u << 12)
35 #define WANTED (1u << 13)
36 #define COMMON_KNOWN (1u << 14)
37
38 #define SHALLOW (1u << 16)
39 #define NOT_SHALLOW (1u << 17)
40 #define CLIENT_SHALLOW (1u << 18)
41 #define HIDDEN_REF (1u << 19)
42
43 #define ALL_FLAGS (THEY_HAVE | OUR_REF | WANTED | COMMON_KNOWN | SHALLOW | \
44 NOT_SHALLOW | CLIENT_SHALLOW | HIDDEN_REF)
45
46 /* Enum for allowed unadvertised object request (UOR) */
47 enum allow_uor {
48 /* Allow specifying sha1 if it is a ref tip. */
49 ALLOW_TIP_SHA1 = 0x01,
50 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
51 ALLOW_REACHABLE_SHA1 = 0x02,
52 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
53 ALLOW_ANY_SHA1 = 0x07
54 };
55
56 /*
57 * Please annotate, and if possible group together, fields used only
58 * for protocol v0 or only for protocol v2.
59 */
60 struct upload_pack_data {
61 struct string_list symref; /* v0 only */
62 struct object_array want_obj;
63 struct object_array have_obj;
64 struct oid_array haves; /* v2 only */
65 struct string_list wanted_refs; /* v2 only */
66 struct strvec hidden_refs;
67
68 struct object_array shallows;
69 struct string_list deepen_not;
70 struct object_array extra_edge_obj;
71 int depth;
72 timestamp_t deepen_since;
73 int deepen_rev_list;
74 int deepen_relative;
75 int keepalive;
76 int shallow_nr;
77 timestamp_t oldest_have;
78
79 unsigned int timeout; /* v0 only */
80 enum {
81 NO_MULTI_ACK = 0,
82 MULTI_ACK = 1,
83 MULTI_ACK_DETAILED = 2
84 } multi_ack; /* v0 only */
85
86 /* 0 for no sideband, otherwise DEFAULT_PACKET_MAX or LARGE_PACKET_MAX */
87 int use_sideband;
88
89 struct string_list uri_protocols;
90 enum allow_uor allow_uor;
91
92 struct list_objects_filter_options filter_options;
93 struct string_list allowed_filters;
94
95 struct packet_writer writer;
96
97 const char *pack_objects_hook;
98
99 unsigned stateless_rpc : 1; /* v0 only */
100 unsigned no_done : 1; /* v0 only */
101 unsigned daemon_mode : 1; /* v0 only */
102 unsigned filter_capability_requested : 1; /* v0 only */
103
104 unsigned use_thin_pack : 1;
105 unsigned use_ofs_delta : 1;
106 unsigned no_progress : 1;
107 unsigned use_include_tag : 1;
108 unsigned wait_for_done : 1;
109 unsigned allow_filter : 1;
110 unsigned allow_filter_fallback : 1;
111 unsigned long tree_filter_max_depth;
112
113 unsigned done : 1; /* v2 only */
114 unsigned allow_ref_in_want : 1; /* v2 only */
115 unsigned allow_sideband_all : 1; /* v2 only */
116 unsigned allow_packfile_uris : 1; /* v2 only */
117 unsigned advertise_sid : 1;
118 unsigned sent_capabilities : 1;
119 };
120
121 static void upload_pack_data_init(struct upload_pack_data *data)
122 {
123 struct string_list symref = STRING_LIST_INIT_DUP;
124 struct string_list wanted_refs = STRING_LIST_INIT_DUP;
125 struct strvec hidden_refs = STRVEC_INIT;
126 struct object_array want_obj = OBJECT_ARRAY_INIT;
127 struct object_array have_obj = OBJECT_ARRAY_INIT;
128 struct oid_array haves = OID_ARRAY_INIT;
129 struct object_array shallows = OBJECT_ARRAY_INIT;
130 struct string_list deepen_not = STRING_LIST_INIT_DUP;
131 struct string_list uri_protocols = STRING_LIST_INIT_DUP;
132 struct object_array extra_edge_obj = OBJECT_ARRAY_INIT;
133 struct string_list allowed_filters = STRING_LIST_INIT_DUP;
134
135 memset(data, 0, sizeof(*data));
136 data->symref = symref;
137 data->wanted_refs = wanted_refs;
138 data->hidden_refs = hidden_refs;
139 data->want_obj = want_obj;
140 data->have_obj = have_obj;
141 data->haves = haves;
142 data->shallows = shallows;
143 data->deepen_not = deepen_not;
144 data->uri_protocols = uri_protocols;
145 data->extra_edge_obj = extra_edge_obj;
146 data->allowed_filters = allowed_filters;
147 data->allow_filter_fallback = 1;
148 data->tree_filter_max_depth = ULONG_MAX;
149 packet_writer_init(&data->writer, 1);
150 list_objects_filter_init(&data->filter_options);
151
152 data->keepalive = 5;
153 data->advertise_sid = 0;
154 }
155
156 static void upload_pack_data_clear(struct upload_pack_data *data)
157 {
158 string_list_clear(&data->symref, 1);
159 string_list_clear(&data->wanted_refs, 1);
160 strvec_clear(&data->hidden_refs);
161 object_array_clear(&data->want_obj);
162 object_array_clear(&data->have_obj);
163 oid_array_clear(&data->haves);
164 object_array_clear(&data->shallows);
165 string_list_clear(&data->deepen_not, 0);
166 object_array_clear(&data->extra_edge_obj);
167 list_objects_filter_release(&data->filter_options);
168 string_list_clear(&data->allowed_filters, 0);
169
170 free((char *)data->pack_objects_hook);
171 }
172
173 static void reset_timeout(unsigned int timeout)
174 {
175 alarm(timeout);
176 }
177
178 static void send_client_data(int fd, const char *data, ssize_t sz,
179 int use_sideband)
180 {
181 if (use_sideband) {
182 send_sideband(1, fd, data, sz, use_sideband);
183 return;
184 }
185 if (fd == 3)
186 /* emergency quit */
187 fd = 2;
188 if (fd == 2) {
189 /* XXX: are we happy to lose stuff here? */
190 xwrite(fd, data, sz);
191 return;
192 }
193 write_or_die(fd, data, sz);
194 }
195
196 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
197 {
198 FILE *fp = cb_data;
199 if (graft->nr_parent == -1)
200 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
201 return 0;
202 }
203
204 struct output_state {
205 /*
206 * We do writes no bigger than LARGE_PACKET_DATA_MAX - 1, because with
207 * sideband-64k the band designator takes up 1 byte of space. Because
208 * relay_pack_data keeps the last byte to itself, we make the buffer 1
209 * byte bigger than the intended maximum write size.
210 */
211 char buffer[(LARGE_PACKET_DATA_MAX - 1) + 1];
212 int used;
213 unsigned packfile_uris_started : 1;
214 unsigned packfile_started : 1;
215 };
216
217 static int relay_pack_data(int pack_objects_out, struct output_state *os,
218 int use_sideband, int write_packfile_line)
219 {
220 /*
221 * We keep the last byte to ourselves
222 * in case we detect broken rev-list, so that we
223 * can leave the stream corrupted. This is
224 * unfortunate -- unpack-objects would happily
225 * accept a valid packdata with trailing garbage,
226 * so appending garbage after we pass all the
227 * pack data is not good enough to signal
228 * breakage to downstream.
229 */
230 ssize_t readsz;
231
232 readsz = xread(pack_objects_out, os->buffer + os->used,
233 sizeof(os->buffer) - os->used);
234 if (readsz < 0) {
235 return readsz;
236 }
237 os->used += readsz;
238
239 while (!os->packfile_started) {
240 char *p;
241 if (os->used >= 4 && !memcmp(os->buffer, "PACK", 4)) {
242 os->packfile_started = 1;
243 if (write_packfile_line) {
244 if (os->packfile_uris_started)
245 packet_delim(1);
246 packet_write_fmt(1, "\1packfile\n");
247 }
248 break;
249 }
250 if ((p = memchr(os->buffer, '\n', os->used))) {
251 if (!os->packfile_uris_started) {
252 os->packfile_uris_started = 1;
253 if (!write_packfile_line)
254 BUG("packfile_uris requires sideband-all");
255 packet_write_fmt(1, "\1packfile-uris\n");
256 }
257 *p = '\0';
258 packet_write_fmt(1, "\1%s\n", os->buffer);
259
260 os->used -= p - os->buffer + 1;
261 memmove(os->buffer, p + 1, os->used);
262 } else {
263 /*
264 * Incomplete line.
265 */
266 return readsz;
267 }
268 }
269
270 if (os->used > 1) {
271 send_client_data(1, os->buffer, os->used - 1, use_sideband);
272 os->buffer[0] = os->buffer[os->used - 1];
273 os->used = 1;
274 } else {
275 send_client_data(1, os->buffer, os->used, use_sideband);
276 os->used = 0;
277 }
278
279 return readsz;
280 }
281
282 static void create_pack_file(struct upload_pack_data *pack_data,
283 const struct string_list *uri_protocols)
284 {
285 struct child_process pack_objects = CHILD_PROCESS_INIT;
286 struct output_state *output_state = xcalloc(1, sizeof(struct output_state));
287 char progress[128];
288 char abort_msg[] = "aborting due to possible repository "
289 "corruption on the remote side.";
290 ssize_t sz;
291 int i;
292 FILE *pipe_fd;
293
294 if (!pack_data->pack_objects_hook)
295 pack_objects.git_cmd = 1;
296 else {
297 strvec_push(&pack_objects.args, pack_data->pack_objects_hook);
298 strvec_push(&pack_objects.args, "git");
299 pack_objects.use_shell = 1;
300 }
301
302 if (pack_data->shallow_nr) {
303 strvec_push(&pack_objects.args, "--shallow-file");
304 strvec_push(&pack_objects.args, "");
305 }
306 strvec_push(&pack_objects.args, "pack-objects");
307 strvec_push(&pack_objects.args, "--revs");
308 if (pack_data->use_thin_pack)
309 strvec_push(&pack_objects.args, "--thin");
310
311 strvec_push(&pack_objects.args, "--stdout");
312 if (pack_data->shallow_nr)
313 strvec_push(&pack_objects.args, "--shallow");
314 if (!pack_data->no_progress)
315 strvec_push(&pack_objects.args, "--progress");
316 if (pack_data->use_ofs_delta)
317 strvec_push(&pack_objects.args, "--delta-base-offset");
318 if (pack_data->use_include_tag)
319 strvec_push(&pack_objects.args, "--include-tag");
320 if (pack_data->filter_options.choice) {
321 const char *spec =
322 expand_list_objects_filter_spec(&pack_data->filter_options);
323 strvec_pushf(&pack_objects.args, "--filter=%s", spec);
324 }
325 if (uri_protocols) {
326 for (i = 0; i < uri_protocols->nr; i++)
327 strvec_pushf(&pack_objects.args, "--uri-protocol=%s",
328 uri_protocols->items[i].string);
329 }
330
331 pack_objects.in = -1;
332 pack_objects.out = -1;
333 pack_objects.err = -1;
334 pack_objects.clean_on_exit = 1;
335
336 if (start_command(&pack_objects))
337 die("git upload-pack: unable to fork git-pack-objects");
338
339 pipe_fd = xfdopen(pack_objects.in, "w");
340
341 if (pack_data->shallow_nr)
342 for_each_commit_graft(write_one_shallow, pipe_fd);
343
344 for (i = 0; i < pack_data->want_obj.nr; i++)
345 fprintf(pipe_fd, "%s\n",
346 oid_to_hex(&pack_data->want_obj.objects[i].item->oid));
347 fprintf(pipe_fd, "--not\n");
348 for (i = 0; i < pack_data->have_obj.nr; i++)
349 fprintf(pipe_fd, "%s\n",
350 oid_to_hex(&pack_data->have_obj.objects[i].item->oid));
351 for (i = 0; i < pack_data->extra_edge_obj.nr; i++)
352 fprintf(pipe_fd, "%s\n",
353 oid_to_hex(&pack_data->extra_edge_obj.objects[i].item->oid));
354 fprintf(pipe_fd, "\n");
355 fflush(pipe_fd);
356 fclose(pipe_fd);
357
358 /* We read from pack_objects.err to capture stderr output for
359 * progress bar, and pack_objects.out to capture the pack data.
360 */
361
362 while (1) {
363 struct pollfd pfd[2];
364 int pe, pu, pollsize, polltimeout;
365 int ret;
366
367 reset_timeout(pack_data->timeout);
368
369 pollsize = 0;
370 pe = pu = -1;
371
372 if (0 <= pack_objects.out) {
373 pfd[pollsize].fd = pack_objects.out;
374 pfd[pollsize].events = POLLIN;
375 pu = pollsize;
376 pollsize++;
377 }
378 if (0 <= pack_objects.err) {
379 pfd[pollsize].fd = pack_objects.err;
380 pfd[pollsize].events = POLLIN;
381 pe = pollsize;
382 pollsize++;
383 }
384
385 if (!pollsize)
386 break;
387
388 polltimeout = pack_data->keepalive < 0
389 ? -1
390 : 1000 * pack_data->keepalive;
391
392 ret = poll(pfd, pollsize, polltimeout);
393
394 if (ret < 0) {
395 if (errno != EINTR) {
396 error_errno("poll failed, resuming");
397 sleep(1);
398 }
399 continue;
400 }
401 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
402 /* Status ready; we ship that in the side-band
403 * or dump to the standard error.
404 */
405 sz = xread(pack_objects.err, progress,
406 sizeof(progress));
407 if (0 < sz)
408 send_client_data(2, progress, sz,
409 pack_data->use_sideband);
410 else if (sz == 0) {
411 close(pack_objects.err);
412 pack_objects.err = -1;
413 }
414 else
415 goto fail;
416 /* give priority to status messages */
417 continue;
418 }
419 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
420 int result = relay_pack_data(pack_objects.out,
421 output_state,
422 pack_data->use_sideband,
423 !!uri_protocols);
424
425 if (result == 0) {
426 close(pack_objects.out);
427 pack_objects.out = -1;
428 } else if (result < 0) {
429 goto fail;
430 }
431 }
432
433 /*
434 * We hit the keepalive timeout without saying anything; send
435 * an empty message on the data sideband just to let the other
436 * side know we're still working on it, but don't have any data
437 * yet.
438 *
439 * If we don't have a sideband channel, there's no room in the
440 * protocol to say anything, so those clients are just out of
441 * luck.
442 */
443 if (!ret && pack_data->use_sideband) {
444 static const char buf[] = "0005\1";
445 write_or_die(1, buf, 5);
446 }
447 }
448
449 if (finish_command(&pack_objects)) {
450 error("git upload-pack: git-pack-objects died with error.");
451 goto fail;
452 }
453
454 /* flush the data */
455 if (output_state->used > 0) {
456 send_client_data(1, output_state->buffer, output_state->used,
457 pack_data->use_sideband);
458 fprintf(stderr, "flushed.\n");
459 }
460 free(output_state);
461 if (pack_data->use_sideband)
462 packet_flush(1);
463 return;
464
465 fail:
466 free(output_state);
467 send_client_data(3, abort_msg, sizeof(abort_msg),
468 pack_data->use_sideband);
469 die("git upload-pack: %s", abort_msg);
470 }
471
472 static int do_got_oid(struct upload_pack_data *data, const struct object_id *oid)
473 {
474 int we_knew_they_have = 0;
475 struct object *o = parse_object(the_repository, oid);
476
477 if (!o)
478 die("oops (%s)", oid_to_hex(oid));
479 if (o->type == OBJ_COMMIT) {
480 struct commit_list *parents;
481 struct commit *commit = (struct commit *)o;
482 if (o->flags & THEY_HAVE)
483 we_knew_they_have = 1;
484 else
485 o->flags |= THEY_HAVE;
486 if (!data->oldest_have || (commit->date < data->oldest_have))
487 data->oldest_have = commit->date;
488 for (parents = commit->parents;
489 parents;
490 parents = parents->next)
491 parents->item->object.flags |= THEY_HAVE;
492 }
493 if (!we_knew_they_have) {
494 add_object_array(o, NULL, &data->have_obj);
495 return 1;
496 }
497 return 0;
498 }
499
500 static int got_oid(struct upload_pack_data *data,
501 const char *hex, struct object_id *oid)
502 {
503 if (get_oid_hex(hex, oid))
504 die("git upload-pack: expected SHA1 object, got '%s'", hex);
505 if (!repo_has_object_file_with_flags(the_repository, oid,
506 OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
507 return -1;
508 return do_got_oid(data, oid);
509 }
510
511 static int ok_to_give_up(struct upload_pack_data *data)
512 {
513 timestamp_t min_generation = GENERATION_NUMBER_ZERO;
514
515 if (!data->have_obj.nr)
516 return 0;
517
518 return can_all_from_reach_with_flag(&data->want_obj, THEY_HAVE,
519 COMMON_KNOWN, data->oldest_have,
520 min_generation);
521 }
522
523 static int get_common_commits(struct upload_pack_data *data,
524 struct packet_reader *reader)
525 {
526 struct object_id oid;
527 char last_hex[GIT_MAX_HEXSZ + 1];
528 int got_common = 0;
529 int got_other = 0;
530 int sent_ready = 0;
531
532 save_commit_buffer = 0;
533
534 for (;;) {
535 const char *arg;
536
537 reset_timeout(data->timeout);
538
539 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
540 if (data->multi_ack == MULTI_ACK_DETAILED
541 && got_common
542 && !got_other
543 && ok_to_give_up(data)) {
544 sent_ready = 1;
545 packet_write_fmt(1, "ACK %s ready\n", last_hex);
546 }
547 if (data->have_obj.nr == 0 || data->multi_ack)
548 packet_write_fmt(1, "NAK\n");
549
550 if (data->no_done && sent_ready) {
551 packet_write_fmt(1, "ACK %s\n", last_hex);
552 return 0;
553 }
554 if (data->stateless_rpc)
555 exit(0);
556 got_common = 0;
557 got_other = 0;
558 continue;
559 }
560 if (skip_prefix(reader->line, "have ", &arg)) {
561 switch (got_oid(data, arg, &oid)) {
562 case -1: /* they have what we do not */
563 got_other = 1;
564 if (data->multi_ack
565 && ok_to_give_up(data)) {
566 const char *hex = oid_to_hex(&oid);
567 if (data->multi_ack == MULTI_ACK_DETAILED) {
568 sent_ready = 1;
569 packet_write_fmt(1, "ACK %s ready\n", hex);
570 } else
571 packet_write_fmt(1, "ACK %s continue\n", hex);
572 }
573 break;
574 default:
575 got_common = 1;
576 oid_to_hex_r(last_hex, &oid);
577 if (data->multi_ack == MULTI_ACK_DETAILED)
578 packet_write_fmt(1, "ACK %s common\n", last_hex);
579 else if (data->multi_ack)
580 packet_write_fmt(1, "ACK %s continue\n", last_hex);
581 else if (data->have_obj.nr == 1)
582 packet_write_fmt(1, "ACK %s\n", last_hex);
583 break;
584 }
585 continue;
586 }
587 if (!strcmp(reader->line, "done")) {
588 if (data->have_obj.nr > 0) {
589 if (data->multi_ack)
590 packet_write_fmt(1, "ACK %s\n", last_hex);
591 return 0;
592 }
593 packet_write_fmt(1, "NAK\n");
594 return -1;
595 }
596 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
597 }
598 }
599
600 static int allow_hidden_refs(enum allow_uor allow_uor)
601 {
602 if ((allow_uor & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1)
603 return 1;
604 return !(allow_uor & (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
605 }
606
607 static void for_each_namespaced_ref_1(each_ref_fn fn,
608 struct upload_pack_data *data)
609 {
610 const char **excludes = NULL;
611 /*
612 * If `data->allow_uor` allows fetching hidden refs, we need to
613 * mark all references (including hidden ones), to check in
614 * `is_our_ref()` below.
615 *
616 * Otherwise, we only care about whether each reference's object
617 * has the OUR_REF bit set or not, so do not need to visit
618 * hidden references.
619 */
620 if (allow_hidden_refs(data->allow_uor))
621 excludes = hidden_refs_to_excludes(&data->hidden_refs);
622
623 for_each_namespaced_ref(excludes, fn, data);
624 }
625
626
627 static int is_our_ref(struct object *o, enum allow_uor allow_uor)
628 {
629 return o->flags & ((allow_hidden_refs(allow_uor) ? 0 : HIDDEN_REF) | OUR_REF);
630 }
631
632 /*
633 * on successful case, it's up to the caller to close cmd->out
634 */
635 static int do_reachable_revlist(struct child_process *cmd,
636 struct object_array *src,
637 struct object_array *reachable,
638 enum allow_uor allow_uor)
639 {
640 struct object *o;
641 FILE *cmd_in = NULL;
642 int i;
643
644 strvec_pushl(&cmd->args, "rev-list", "--stdin", NULL);
645 cmd->git_cmd = 1;
646 cmd->no_stderr = 1;
647 cmd->in = -1;
648 cmd->out = -1;
649
650 /*
651 * If the next rev-list --stdin encounters an unknown commit,
652 * it terminates, which will cause SIGPIPE in the write loop
653 * below.
654 */
655 sigchain_push(SIGPIPE, SIG_IGN);
656
657 if (start_command(cmd))
658 goto error;
659
660 cmd_in = xfdopen(cmd->in, "w");
661
662 for (i = get_max_object_index(); 0 < i; ) {
663 o = get_indexed_object(--i);
664 if (!o)
665 continue;
666 if (reachable && o->type == OBJ_COMMIT)
667 o->flags &= ~TMP_MARK;
668 if (!is_our_ref(o, allow_uor))
669 continue;
670 if (fprintf(cmd_in, "^%s\n", oid_to_hex(&o->oid)) < 0)
671 goto error;
672 }
673 for (i = 0; i < src->nr; i++) {
674 o = src->objects[i].item;
675 if (is_our_ref(o, allow_uor)) {
676 if (reachable)
677 add_object_array(o, NULL, reachable);
678 continue;
679 }
680 if (reachable && o->type == OBJ_COMMIT)
681 o->flags |= TMP_MARK;
682 if (fprintf(cmd_in, "%s\n", oid_to_hex(&o->oid)) < 0)
683 goto error;
684 }
685 if (ferror(cmd_in) || fflush(cmd_in))
686 goto error;
687 fclose(cmd_in);
688 cmd->in = -1;
689 sigchain_pop(SIGPIPE);
690
691 return 0;
692
693 error:
694 sigchain_pop(SIGPIPE);
695
696 if (cmd_in)
697 fclose(cmd_in);
698 if (cmd->out >= 0)
699 close(cmd->out);
700 return -1;
701 }
702
703 static int get_reachable_list(struct upload_pack_data *data,
704 struct object_array *reachable)
705 {
706 struct child_process cmd = CHILD_PROCESS_INIT;
707 int i;
708 struct object *o;
709 char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
710 const unsigned hexsz = the_hash_algo->hexsz;
711
712 if (do_reachable_revlist(&cmd, &data->shallows, reachable,
713 data->allow_uor) < 0)
714 return -1;
715
716 while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
717 struct object_id oid;
718 const char *p;
719
720 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
721 break;
722
723 o = lookup_object(the_repository, &oid);
724 if (o && o->type == OBJ_COMMIT) {
725 o->flags &= ~TMP_MARK;
726 }
727 }
728 for (i = get_max_object_index(); 0 < i; i--) {
729 o = get_indexed_object(i - 1);
730 if (o && o->type == OBJ_COMMIT &&
731 (o->flags & TMP_MARK)) {
732 add_object_array(o, NULL, reachable);
733 o->flags &= ~TMP_MARK;
734 }
735 }
736 close(cmd.out);
737
738 if (finish_command(&cmd))
739 return -1;
740
741 return 0;
742 }
743
744 static int has_unreachable(struct object_array *src, enum allow_uor allow_uor)
745 {
746 struct child_process cmd = CHILD_PROCESS_INIT;
747 char buf[1];
748 int i;
749
750 if (do_reachable_revlist(&cmd, src, NULL, allow_uor) < 0)
751 return 1;
752
753 /*
754 * The commits out of the rev-list are not ancestors of
755 * our ref.
756 */
757 i = read_in_full(cmd.out, buf, 1);
758 if (i)
759 goto error;
760 close(cmd.out);
761 cmd.out = -1;
762
763 /*
764 * rev-list may have died by encountering a bad commit
765 * in the history, in which case we do want to bail out
766 * even when it showed no commit.
767 */
768 if (finish_command(&cmd))
769 goto error;
770
771 /* All the non-tip ones are ancestors of what we advertised */
772 return 0;
773
774 error:
775 if (cmd.out >= 0)
776 close(cmd.out);
777 return 1;
778 }
779
780 static void check_non_tip(struct upload_pack_data *data)
781 {
782 int i;
783
784 /*
785 * In the normal in-process case without
786 * uploadpack.allowReachableSHA1InWant,
787 * non-tip requests can never happen.
788 */
789 if (!data->stateless_rpc && !(data->allow_uor & ALLOW_REACHABLE_SHA1))
790 goto error;
791 if (!has_unreachable(&data->want_obj, data->allow_uor))
792 /* All the non-tip ones are ancestors of what we advertised */
793 return;
794
795 error:
796 /* Pick one of them (we know there at least is one) */
797 for (i = 0; i < data->want_obj.nr; i++) {
798 struct object *o = data->want_obj.objects[i].item;
799 if (!is_our_ref(o, data->allow_uor)) {
800 error("git upload-pack: not our ref %s",
801 oid_to_hex(&o->oid));
802 packet_writer_error(&data->writer,
803 "upload-pack: not our ref %s",
804 oid_to_hex(&o->oid));
805 exit(128);
806 }
807 }
808 }
809
810 static void send_shallow(struct upload_pack_data *data,
811 struct commit_list *result)
812 {
813 while (result) {
814 struct object *object = &result->item->object;
815 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
816 packet_writer_write(&data->writer, "shallow %s",
817 oid_to_hex(&object->oid));
818 register_shallow(the_repository, &object->oid);
819 data->shallow_nr++;
820 }
821 result = result->next;
822 }
823 }
824
825 static void send_unshallow(struct upload_pack_data *data)
826 {
827 int i;
828
829 for (i = 0; i < data->shallows.nr; i++) {
830 struct object *object = data->shallows.objects[i].item;
831 if (object->flags & NOT_SHALLOW) {
832 struct commit_list *parents;
833 packet_writer_write(&data->writer, "unshallow %s",
834 oid_to_hex(&object->oid));
835 object->flags &= ~CLIENT_SHALLOW;
836 /*
837 * We want to _register_ "object" as shallow, but we
838 * also need to traverse object's parents to deepen a
839 * shallow clone. Unregister it for now so we can
840 * parse and add the parents to the want list, then
841 * re-register it.
842 */
843 unregister_shallow(&object->oid);
844 object->parsed = 0;
845 parse_commit_or_die((struct commit *)object);
846 parents = ((struct commit *)object)->parents;
847 while (parents) {
848 add_object_array(&parents->item->object,
849 NULL, &data->want_obj);
850 parents = parents->next;
851 }
852 add_object_array(object, NULL, &data->extra_edge_obj);
853 }
854 /* make sure commit traversal conforms to client */
855 register_shallow(the_repository, &object->oid);
856 }
857 }
858
859 static int check_ref(const char *refname_full, const struct object_id *oid,
860 int flag, void *cb_data);
861 static void deepen(struct upload_pack_data *data, int depth)
862 {
863 if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
864 int i;
865
866 for (i = 0; i < data->shallows.nr; i++) {
867 struct object *object = data->shallows.objects[i].item;
868 object->flags |= NOT_SHALLOW;
869 }
870 } else if (data->deepen_relative) {
871 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
872 struct commit_list *result;
873
874 /*
875 * Checking for reachable shallows requires that our refs be
876 * marked with OUR_REF.
877 */
878 head_ref_namespaced(check_ref, data);
879 for_each_namespaced_ref_1(check_ref, data);
880
881 get_reachable_list(data, &reachable_shallows);
882 result = get_shallow_commits(&reachable_shallows,
883 depth + 1,
884 SHALLOW, NOT_SHALLOW);
885 send_shallow(data, result);
886 free_commit_list(result);
887 object_array_clear(&reachable_shallows);
888 } else {
889 struct commit_list *result;
890
891 result = get_shallow_commits(&data->want_obj, depth,
892 SHALLOW, NOT_SHALLOW);
893 send_shallow(data, result);
894 free_commit_list(result);
895 }
896
897 send_unshallow(data);
898 }
899
900 static void deepen_by_rev_list(struct upload_pack_data *data,
901 int ac,
902 const char **av)
903 {
904 struct commit_list *result;
905
906 disable_commit_graph(the_repository);
907 result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
908 send_shallow(data, result);
909 free_commit_list(result);
910 send_unshallow(data);
911 }
912
913 /* Returns 1 if a shallow list is sent or 0 otherwise */
914 static int send_shallow_list(struct upload_pack_data *data)
915 {
916 int ret = 0;
917
918 if (data->depth > 0 && data->deepen_rev_list)
919 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
920 if (data->depth > 0) {
921 deepen(data, data->depth);
922 ret = 1;
923 } else if (data->deepen_rev_list) {
924 struct strvec av = STRVEC_INIT;
925 int i;
926
927 strvec_push(&av, "rev-list");
928 if (data->deepen_since)
929 strvec_pushf(&av, "--max-age=%"PRItime, data->deepen_since);
930 if (data->deepen_not.nr) {
931 strvec_push(&av, "--not");
932 for (i = 0; i < data->deepen_not.nr; i++) {
933 struct string_list_item *s = data->deepen_not.items + i;
934 strvec_push(&av, s->string);
935 }
936 strvec_push(&av, "--not");
937 }
938 for (i = 0; i < data->want_obj.nr; i++) {
939 struct object *o = data->want_obj.objects[i].item;
940 strvec_push(&av, oid_to_hex(&o->oid));
941 }
942 deepen_by_rev_list(data, av.nr, av.v);
943 strvec_clear(&av);
944 ret = 1;
945 } else {
946 if (data->shallows.nr > 0) {
947 int i;
948 for (i = 0; i < data->shallows.nr; i++)
949 register_shallow(the_repository,
950 &data->shallows.objects[i].item->oid);
951 }
952 }
953
954 data->shallow_nr += data->shallows.nr;
955 return ret;
956 }
957
958 static int process_shallow(const char *line, struct object_array *shallows)
959 {
960 const char *arg;
961 if (skip_prefix(line, "shallow ", &arg)) {
962 struct object_id oid;
963 struct object *object;
964 if (get_oid_hex(arg, &oid))
965 die("invalid shallow line: %s", line);
966 object = parse_object(the_repository, &oid);
967 if (!object)
968 return 1;
969 if (object->type != OBJ_COMMIT)
970 die("invalid shallow object %s", oid_to_hex(&oid));
971 if (!(object->flags & CLIENT_SHALLOW)) {
972 object->flags |= CLIENT_SHALLOW;
973 add_object_array(object, NULL, shallows);
974 }
975 return 1;
976 }
977
978 return 0;
979 }
980
981 static int process_deepen(const char *line, int *depth)
982 {
983 const char *arg;
984 if (skip_prefix(line, "deepen ", &arg)) {
985 char *end = NULL;
986 *depth = (int)strtol(arg, &end, 0);
987 if (!end || *end || *depth <= 0)
988 die("Invalid deepen: %s", line);
989 return 1;
990 }
991
992 return 0;
993 }
994
995 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
996 {
997 const char *arg;
998 if (skip_prefix(line, "deepen-since ", &arg)) {
999 char *end = NULL;
1000 *deepen_since = parse_timestamp(arg, &end, 0);
1001 if (!end || *end || !deepen_since ||
1002 /* revisions.c's max_age -1 is special */
1003 *deepen_since == -1)
1004 die("Invalid deepen-since: %s", line);
1005 *deepen_rev_list = 1;
1006 return 1;
1007 }
1008 return 0;
1009 }
1010
1011 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
1012 {
1013 const char *arg;
1014 if (skip_prefix(line, "deepen-not ", &arg)) {
1015 char *ref = NULL;
1016 struct object_id oid;
1017 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
1018 die("git upload-pack: ambiguous deepen-not: %s", line);
1019 string_list_append(deepen_not, ref);
1020 free(ref);
1021 *deepen_rev_list = 1;
1022 return 1;
1023 }
1024 return 0;
1025 }
1026
1027 NORETURN __attribute__((format(printf,2,3)))
1028 static void send_err_and_die(struct upload_pack_data *data,
1029 const char *fmt, ...)
1030 {
1031 struct strbuf buf = STRBUF_INIT;
1032 va_list ap;
1033
1034 va_start(ap, fmt);
1035 strbuf_vaddf(&buf, fmt, ap);
1036 va_end(ap);
1037
1038 packet_writer_error(&data->writer, "%s", buf.buf);
1039 die("%s", buf.buf);
1040 }
1041
1042 static void check_one_filter(struct upload_pack_data *data,
1043 struct list_objects_filter_options *opts)
1044 {
1045 const char *key = list_object_filter_config_name(opts->choice);
1046 struct string_list_item *item = string_list_lookup(&data->allowed_filters,
1047 key);
1048 int allowed;
1049
1050 if (item)
1051 allowed = (intptr_t)item->util;
1052 else
1053 allowed = data->allow_filter_fallback;
1054
1055 if (!allowed)
1056 send_err_and_die(data, "filter '%s' not supported", key);
1057
1058 if (opts->choice == LOFC_TREE_DEPTH &&
1059 opts->tree_exclude_depth > data->tree_filter_max_depth)
1060 send_err_and_die(data,
1061 "tree filter allows max depth %lu, but got %lu",
1062 data->tree_filter_max_depth,
1063 opts->tree_exclude_depth);
1064 }
1065
1066 static void check_filter_recurse(struct upload_pack_data *data,
1067 struct list_objects_filter_options *opts)
1068 {
1069 size_t i;
1070
1071 check_one_filter(data, opts);
1072 if (opts->choice != LOFC_COMBINE)
1073 return;
1074
1075 for (i = 0; i < opts->sub_nr; i++)
1076 check_filter_recurse(data, &opts->sub[i]);
1077 }
1078
1079 static void die_if_using_banned_filter(struct upload_pack_data *data)
1080 {
1081 check_filter_recurse(data, &data->filter_options);
1082 }
1083
1084 static void receive_needs(struct upload_pack_data *data,
1085 struct packet_reader *reader)
1086 {
1087 int has_non_tip = 0;
1088
1089 data->shallow_nr = 0;
1090 for (;;) {
1091 struct object *o;
1092 const char *features;
1093 struct object_id oid_buf;
1094 const char *arg;
1095 size_t feature_len;
1096
1097 reset_timeout(data->timeout);
1098 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
1099 break;
1100
1101 if (process_shallow(reader->line, &data->shallows))
1102 continue;
1103 if (process_deepen(reader->line, &data->depth))
1104 continue;
1105 if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
1106 continue;
1107 if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
1108 continue;
1109
1110 if (skip_prefix(reader->line, "filter ", &arg)) {
1111 if (!data->filter_capability_requested)
1112 die("git upload-pack: filtering capability not negotiated");
1113 list_objects_filter_die_if_populated(&data->filter_options);
1114 parse_list_objects_filter(&data->filter_options, arg);
1115 die_if_using_banned_filter(data);
1116 continue;
1117 }
1118
1119 if (!skip_prefix(reader->line, "want ", &arg) ||
1120 parse_oid_hex(arg, &oid_buf, &features))
1121 die("git upload-pack: protocol error, "
1122 "expected to get object ID, not '%s'", reader->line);
1123
1124 if (parse_feature_request(features, "deepen-relative"))
1125 data->deepen_relative = 1;
1126 if (parse_feature_request(features, "multi_ack_detailed"))
1127 data->multi_ack = MULTI_ACK_DETAILED;
1128 else if (parse_feature_request(features, "multi_ack"))
1129 data->multi_ack = MULTI_ACK;
1130 if (parse_feature_request(features, "no-done"))
1131 data->no_done = 1;
1132 if (parse_feature_request(features, "thin-pack"))
1133 data->use_thin_pack = 1;
1134 if (parse_feature_request(features, "ofs-delta"))
1135 data->use_ofs_delta = 1;
1136 if (parse_feature_request(features, "side-band-64k"))
1137 data->use_sideband = LARGE_PACKET_MAX;
1138 else if (parse_feature_request(features, "side-band"))
1139 data->use_sideband = DEFAULT_PACKET_MAX;
1140 if (parse_feature_request(features, "no-progress"))
1141 data->no_progress = 1;
1142 if (parse_feature_request(features, "include-tag"))
1143 data->use_include_tag = 1;
1144 if (data->allow_filter &&
1145 parse_feature_request(features, "filter"))
1146 data->filter_capability_requested = 1;
1147
1148 arg = parse_feature_value(features, "session-id", &feature_len, NULL);
1149 if (arg) {
1150 char *client_sid = xstrndup(arg, feature_len);
1151 trace2_data_string("transfer", NULL, "client-sid", client_sid);
1152 free(client_sid);
1153 }
1154
1155 o = parse_object(the_repository, &oid_buf);
1156 if (!o) {
1157 packet_writer_error(&data->writer,
1158 "upload-pack: not our ref %s",
1159 oid_to_hex(&oid_buf));
1160 die("git upload-pack: not our ref %s",
1161 oid_to_hex(&oid_buf));
1162 }
1163 if (!(o->flags & WANTED)) {
1164 o->flags |= WANTED;
1165 if (!((data->allow_uor & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
1166 || is_our_ref(o, data->allow_uor)))
1167 has_non_tip = 1;
1168 add_object_array(o, NULL, &data->want_obj);
1169 }
1170 }
1171
1172 /*
1173 * We have sent all our refs already, and the other end
1174 * should have chosen out of them. When we are operating
1175 * in the stateless RPC mode, however, their choice may
1176 * have been based on the set of older refs advertised
1177 * by another process that handled the initial request.
1178 */
1179 if (has_non_tip)
1180 check_non_tip(data);
1181
1182 if (!data->use_sideband && data->daemon_mode)
1183 data->no_progress = 1;
1184
1185 if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1186 return;
1187
1188 if (send_shallow_list(data))
1189 packet_flush(1);
1190 }
1191
1192 /* return non-zero if the ref is hidden, otherwise 0 */
1193 static int mark_our_ref(const char *refname, const char *refname_full,
1194 const struct object_id *oid, const struct strvec *hidden_refs)
1195 {
1196 struct object *o = lookup_unknown_object(the_repository, oid);
1197
1198 if (ref_is_hidden(refname, refname_full, hidden_refs)) {
1199 o->flags |= HIDDEN_REF;
1200 return 1;
1201 }
1202 o->flags |= OUR_REF;
1203 return 0;
1204 }
1205
1206 static int check_ref(const char *refname_full, const struct object_id *oid,
1207 int flag UNUSED, void *cb_data)
1208 {
1209 const char *refname = strip_namespace(refname_full);
1210 struct upload_pack_data *data = cb_data;
1211
1212 mark_our_ref(refname, refname_full, oid, &data->hidden_refs);
1213 return 0;
1214 }
1215
1216 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1217 {
1218 struct string_list_item *item;
1219
1220 if (!symref->nr)
1221 return;
1222 for_each_string_list_item(item, symref)
1223 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1224 }
1225
1226 static void format_session_id(struct strbuf *buf, struct upload_pack_data *d) {
1227 if (d->advertise_sid)
1228 strbuf_addf(buf, " session-id=%s", trace2_session_id());
1229 }
1230
1231 static void write_v0_ref(struct upload_pack_data *data,
1232 const char *refname, const char *refname_nons,
1233 const struct object_id *oid)
1234 {
1235 static const char *capabilities = "multi_ack thin-pack side-band"
1236 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1237 " deepen-relative no-progress include-tag multi_ack_detailed";
1238 struct object_id peeled;
1239
1240 if (mark_our_ref(refname_nons, refname, oid, &data->hidden_refs))
1241 return;
1242
1243 if (capabilities) {
1244 struct strbuf symref_info = STRBUF_INIT;
1245 struct strbuf session_id = STRBUF_INIT;
1246
1247 format_symref_info(&symref_info, &data->symref);
1248 format_session_id(&session_id, data);
1249 packet_fwrite_fmt(stdout, "%s %s%c%s%s%s%s%s%s%s object-format=%s agent=%s\n",
1250 oid_to_hex(oid), refname_nons,
1251 0, capabilities,
1252 (data->allow_uor & ALLOW_TIP_SHA1) ?
1253 " allow-tip-sha1-in-want" : "",
1254 (data->allow_uor & ALLOW_REACHABLE_SHA1) ?
1255 " allow-reachable-sha1-in-want" : "",
1256 data->no_done ? " no-done" : "",
1257 symref_info.buf,
1258 data->allow_filter ? " filter" : "",
1259 session_id.buf,
1260 the_hash_algo->name,
1261 git_user_agent_sanitized());
1262 strbuf_release(&symref_info);
1263 strbuf_release(&session_id);
1264 data->sent_capabilities = 1;
1265 } else {
1266 packet_fwrite_fmt(stdout, "%s %s\n", oid_to_hex(oid), refname_nons);
1267 }
1268 capabilities = NULL;
1269 if (!peel_iterated_oid(oid, &peeled))
1270 packet_fwrite_fmt(stdout, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1271 return;
1272 }
1273
1274 static int send_ref(const char *refname, const struct object_id *oid,
1275 int flag UNUSED, void *cb_data)
1276 {
1277 write_v0_ref(cb_data, refname, strip_namespace(refname), oid);
1278 return 0;
1279 }
1280
1281 static int find_symref(const char *refname,
1282 const struct object_id *oid UNUSED,
1283 int flag, void *cb_data)
1284 {
1285 const char *symref_target;
1286 struct string_list_item *item;
1287
1288 if ((flag & REF_ISSYMREF) == 0)
1289 return 0;
1290 symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1291 if (!symref_target || (flag & REF_ISSYMREF) == 0)
1292 die("'%s' is a symref but it is not?", refname);
1293 item = string_list_append(cb_data, strip_namespace(refname));
1294 item->util = xstrdup(strip_namespace(symref_target));
1295 return 0;
1296 }
1297
1298 static int parse_object_filter_config(const char *var, const char *value,
1299 const struct key_value_info *kvi,
1300 struct upload_pack_data *data)
1301 {
1302 struct strbuf buf = STRBUF_INIT;
1303 const char *sub, *key;
1304 size_t sub_len;
1305
1306 if (parse_config_key(var, "uploadpackfilter", &sub, &sub_len, &key))
1307 return 0;
1308
1309 if (!sub) {
1310 if (!strcmp(key, "allow"))
1311 data->allow_filter_fallback = git_config_bool(var, value);
1312 return 0;
1313 }
1314
1315 strbuf_add(&buf, sub, sub_len);
1316
1317 if (!strcmp(key, "allow"))
1318 string_list_insert(&data->allowed_filters, buf.buf)->util =
1319 (void *)(intptr_t)git_config_bool(var, value);
1320 else if (!strcmp(buf.buf, "tree") && !strcmp(key, "maxdepth")) {
1321 if (!value) {
1322 strbuf_release(&buf);
1323 return config_error_nonbool(var);
1324 }
1325 string_list_insert(&data->allowed_filters, buf.buf)->util =
1326 (void *)(intptr_t)1;
1327 data->tree_filter_max_depth = git_config_ulong(var, value,
1328 kvi);
1329 }
1330
1331 strbuf_release(&buf);
1332 return 0;
1333 }
1334
1335 static int upload_pack_config(const char *var, const char *value,
1336 const struct config_context *ctx,
1337 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, ctx->kvi);
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("uploadpack.blobpackfileuri", var)) {
1367 if (value)
1368 data->allow_packfile_uris = 1;
1369 } else if (!strcmp("core.precomposeunicode", var)) {
1370 precomposed_unicode = git_config_bool(var, value);
1371 } else if (!strcmp("transfer.advertisesid", var)) {
1372 data->advertise_sid = git_config_bool(var, value);
1373 }
1374
1375 if (parse_object_filter_config(var, value, ctx->kvi, data) < 0)
1376 return -1;
1377
1378 return parse_hide_refs_config(var, value, "uploadpack", &data->hidden_refs);
1379 }
1380
1381 static int upload_pack_protected_config(const char *var, const char *value,
1382 const struct config_context *ctx UNUSED,
1383 void *cb_data)
1384 {
1385 struct upload_pack_data *data = cb_data;
1386
1387 if (!strcmp("uploadpack.packobjectshook", var))
1388 return git_config_string(&data->pack_objects_hook, var, value);
1389 return 0;
1390 }
1391
1392 static void get_upload_pack_config(struct repository *r,
1393 struct upload_pack_data *data)
1394 {
1395 repo_config(r, upload_pack_config, data);
1396 git_protected_config(upload_pack_protected_config, data);
1397
1398 data->allow_sideband_all |= git_env_bool("GIT_TEST_SIDEBAND_ALL", 0);
1399 }
1400
1401 void upload_pack(const int advertise_refs, const int stateless_rpc,
1402 const int timeout)
1403 {
1404 struct packet_reader reader;
1405 struct upload_pack_data data;
1406
1407 upload_pack_data_init(&data);
1408 get_upload_pack_config(the_repository, &data);
1409
1410 data.stateless_rpc = stateless_rpc;
1411 data.timeout = timeout;
1412 if (data.timeout)
1413 data.daemon_mode = 1;
1414
1415 head_ref_namespaced(find_symref, &data.symref);
1416
1417 if (advertise_refs || !data.stateless_rpc) {
1418 reset_timeout(data.timeout);
1419 if (advertise_refs)
1420 data.no_done = 1;
1421 head_ref_namespaced(send_ref, &data);
1422 for_each_namespaced_ref_1(send_ref, &data);
1423 if (!data.sent_capabilities) {
1424 const char *refname = "capabilities^{}";
1425 write_v0_ref(&data, refname, refname, null_oid());
1426 }
1427 /*
1428 * fflush stdout before calling advertise_shallow_grafts because send_ref
1429 * uses stdio.
1430 */
1431 fflush_or_die(stdout);
1432 advertise_shallow_grafts(1);
1433 packet_flush(1);
1434 } else {
1435 head_ref_namespaced(check_ref, &data);
1436 for_each_namespaced_ref_1(check_ref, &data);
1437 }
1438
1439 if (!advertise_refs) {
1440 packet_reader_init(&reader, 0, NULL, 0,
1441 PACKET_READ_CHOMP_NEWLINE |
1442 PACKET_READ_DIE_ON_ERR_PACKET);
1443
1444 receive_needs(&data, &reader);
1445
1446 /*
1447 * An EOF at this exact point in negotiation should be
1448 * acceptable from stateless clients as they will consume the
1449 * shallow list before doing subsequent rpc with haves/etc.
1450 */
1451 if (data.stateless_rpc)
1452 reader.options |= PACKET_READ_GENTLE_ON_EOF;
1453
1454 if (data.want_obj.nr &&
1455 packet_reader_peek(&reader) != PACKET_READ_EOF) {
1456 reader.options &= ~PACKET_READ_GENTLE_ON_EOF;
1457 get_common_commits(&data, &reader);
1458 create_pack_file(&data, NULL);
1459 }
1460 }
1461
1462 upload_pack_data_clear(&data);
1463 }
1464
1465 static int parse_want(struct packet_writer *writer, const char *line,
1466 struct object_array *want_obj)
1467 {
1468 const char *arg;
1469 if (skip_prefix(line, "want ", &arg)) {
1470 struct object_id oid;
1471 struct object *o;
1472
1473 if (get_oid_hex(arg, &oid))
1474 die("git upload-pack: protocol error, "
1475 "expected to get oid, not '%s'", line);
1476
1477 o = parse_object_with_flags(the_repository, &oid,
1478 PARSE_OBJECT_SKIP_HASH_CHECK);
1479
1480 if (!o) {
1481 packet_writer_error(writer,
1482 "upload-pack: not our ref %s",
1483 oid_to_hex(&oid));
1484 die("git upload-pack: not our ref %s",
1485 oid_to_hex(&oid));
1486 }
1487
1488 if (!(o->flags & WANTED)) {
1489 o->flags |= WANTED;
1490 add_object_array(o, NULL, want_obj);
1491 }
1492
1493 return 1;
1494 }
1495
1496 return 0;
1497 }
1498
1499 static int parse_want_ref(struct packet_writer *writer, const char *line,
1500 struct string_list *wanted_refs,
1501 struct strvec *hidden_refs,
1502 struct object_array *want_obj)
1503 {
1504 const char *refname_nons;
1505 if (skip_prefix(line, "want-ref ", &refname_nons)) {
1506 struct object_id oid;
1507 struct string_list_item *item;
1508 struct object *o = NULL;
1509 struct strbuf refname = STRBUF_INIT;
1510
1511 strbuf_addf(&refname, "%s%s", get_git_namespace(), refname_nons);
1512 if (ref_is_hidden(refname_nons, refname.buf, hidden_refs) ||
1513 read_ref(refname.buf, &oid)) {
1514 packet_writer_error(writer, "unknown ref %s", refname_nons);
1515 die("unknown ref %s", refname_nons);
1516 }
1517 strbuf_release(&refname);
1518
1519 item = string_list_append(wanted_refs, refname_nons);
1520 item->util = oiddup(&oid);
1521
1522 if (!starts_with(refname_nons, "refs/tags/")) {
1523 struct commit *commit = lookup_commit_in_graph(the_repository, &oid);
1524 if (commit)
1525 o = &commit->object;
1526 }
1527
1528 if (!o)
1529 o = parse_object_or_die(&oid, refname_nons);
1530
1531 if (!(o->flags & WANTED)) {
1532 o->flags |= WANTED;
1533 add_object_array(o, NULL, want_obj);
1534 }
1535
1536 return 1;
1537 }
1538
1539 return 0;
1540 }
1541
1542 static int parse_have(const char *line, struct oid_array *haves)
1543 {
1544 const char *arg;
1545 if (skip_prefix(line, "have ", &arg)) {
1546 struct object_id oid;
1547
1548 if (get_oid_hex(arg, &oid))
1549 die("git upload-pack: expected SHA1 object, got '%s'", arg);
1550 oid_array_append(haves, &oid);
1551 return 1;
1552 }
1553
1554 return 0;
1555 }
1556
1557 static void trace2_fetch_info(struct upload_pack_data *data)
1558 {
1559 struct json_writer jw = JSON_WRITER_INIT;
1560
1561 jw_object_begin(&jw, 0);
1562 jw_object_intmax(&jw, "haves", data->haves.nr);
1563 jw_object_intmax(&jw, "wants", data->want_obj.nr);
1564 jw_object_intmax(&jw, "want-refs", data->wanted_refs.nr);
1565 jw_object_intmax(&jw, "depth", data->depth);
1566 jw_object_intmax(&jw, "shallows", data->shallows.nr);
1567 jw_object_bool(&jw, "deepen-since", data->deepen_since);
1568 jw_object_intmax(&jw, "deepen-not", data->deepen_not.nr);
1569 jw_object_bool(&jw, "deepen-relative", data->deepen_relative);
1570 if (data->filter_options.choice)
1571 jw_object_string(&jw, "filter", list_object_filter_config_name(data->filter_options.choice));
1572 else
1573 jw_object_null(&jw, "filter");
1574 jw_end(&jw);
1575
1576 trace2_data_json("upload-pack", the_repository, "fetch-info", &jw);
1577
1578 jw_release(&jw);
1579 }
1580
1581 static void process_args(struct packet_reader *request,
1582 struct upload_pack_data *data)
1583 {
1584 while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1585 const char *arg = request->line;
1586 const char *p;
1587
1588 /* process want */
1589 if (parse_want(&data->writer, arg, &data->want_obj))
1590 continue;
1591 if (data->allow_ref_in_want &&
1592 parse_want_ref(&data->writer, arg, &data->wanted_refs,
1593 &data->hidden_refs, &data->want_obj))
1594 continue;
1595 /* process have line */
1596 if (parse_have(arg, &data->haves))
1597 continue;
1598
1599 /* process args like thin-pack */
1600 if (!strcmp(arg, "thin-pack")) {
1601 data->use_thin_pack = 1;
1602 continue;
1603 }
1604 if (!strcmp(arg, "ofs-delta")) {
1605 data->use_ofs_delta = 1;
1606 continue;
1607 }
1608 if (!strcmp(arg, "no-progress")) {
1609 data->no_progress = 1;
1610 continue;
1611 }
1612 if (!strcmp(arg, "include-tag")) {
1613 data->use_include_tag = 1;
1614 continue;
1615 }
1616 if (!strcmp(arg, "done")) {
1617 data->done = 1;
1618 continue;
1619 }
1620 if (!strcmp(arg, "wait-for-done")) {
1621 data->wait_for_done = 1;
1622 continue;
1623 }
1624
1625 /* Shallow related arguments */
1626 if (process_shallow(arg, &data->shallows))
1627 continue;
1628 if (process_deepen(arg, &data->depth))
1629 continue;
1630 if (process_deepen_since(arg, &data->deepen_since,
1631 &data->deepen_rev_list))
1632 continue;
1633 if (process_deepen_not(arg, &data->deepen_not,
1634 &data->deepen_rev_list))
1635 continue;
1636 if (!strcmp(arg, "deepen-relative")) {
1637 data->deepen_relative = 1;
1638 continue;
1639 }
1640
1641 if (data->allow_filter && skip_prefix(arg, "filter ", &p)) {
1642 list_objects_filter_die_if_populated(&data->filter_options);
1643 parse_list_objects_filter(&data->filter_options, p);
1644 die_if_using_banned_filter(data);
1645 continue;
1646 }
1647
1648 if (data->allow_sideband_all &&
1649 !strcmp(arg, "sideband-all")) {
1650 data->writer.use_sideband = 1;
1651 continue;
1652 }
1653
1654 if (data->allow_packfile_uris &&
1655 skip_prefix(arg, "packfile-uris ", &p)) {
1656 string_list_split(&data->uri_protocols, p, ',', -1);
1657 continue;
1658 }
1659
1660 /* ignore unknown lines maybe? */
1661 die("unexpected line: '%s'", arg);
1662 }
1663
1664 if (data->uri_protocols.nr && !data->writer.use_sideband)
1665 string_list_clear(&data->uri_protocols, 0);
1666
1667 if (request->status != PACKET_READ_FLUSH)
1668 die(_("expected flush after fetch arguments"));
1669
1670 if (trace2_is_enabled())
1671 trace2_fetch_info(data);
1672 }
1673
1674 static int process_haves(struct upload_pack_data *data, struct oid_array *common)
1675 {
1676 int i;
1677
1678 /* Process haves */
1679 for (i = 0; i < data->haves.nr; i++) {
1680 const struct object_id *oid = &data->haves.oid[i];
1681
1682 if (!repo_has_object_file_with_flags(the_repository, oid,
1683 OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
1684 continue;
1685
1686 oid_array_append(common, oid);
1687
1688 do_got_oid(data, oid);
1689 }
1690
1691 return 0;
1692 }
1693
1694 static int send_acks(struct upload_pack_data *data, struct oid_array *acks)
1695 {
1696 int i;
1697
1698 packet_writer_write(&data->writer, "acknowledgments\n");
1699
1700 /* Send Acks */
1701 if (!acks->nr)
1702 packet_writer_write(&data->writer, "NAK\n");
1703
1704 for (i = 0; i < acks->nr; i++) {
1705 packet_writer_write(&data->writer, "ACK %s\n",
1706 oid_to_hex(&acks->oid[i]));
1707 }
1708
1709 if (!data->wait_for_done && ok_to_give_up(data)) {
1710 /* Send Ready */
1711 packet_writer_write(&data->writer, "ready\n");
1712 return 1;
1713 }
1714
1715 return 0;
1716 }
1717
1718 static int process_haves_and_send_acks(struct upload_pack_data *data)
1719 {
1720 struct oid_array common = OID_ARRAY_INIT;
1721 int ret = 0;
1722
1723 process_haves(data, &common);
1724 if (data->done) {
1725 ret = 1;
1726 } else if (send_acks(data, &common)) {
1727 packet_writer_delim(&data->writer);
1728 ret = 1;
1729 } else {
1730 /* Add Flush */
1731 packet_writer_flush(&data->writer);
1732 ret = 0;
1733 }
1734
1735 oid_array_clear(&data->haves);
1736 oid_array_clear(&common);
1737 return ret;
1738 }
1739
1740 static void send_wanted_ref_info(struct upload_pack_data *data)
1741 {
1742 const struct string_list_item *item;
1743
1744 if (!data->wanted_refs.nr)
1745 return;
1746
1747 packet_writer_write(&data->writer, "wanted-refs\n");
1748
1749 for_each_string_list_item(item, &data->wanted_refs) {
1750 packet_writer_write(&data->writer, "%s %s\n",
1751 oid_to_hex(item->util),
1752 item->string);
1753 }
1754
1755 packet_writer_delim(&data->writer);
1756 }
1757
1758 static void send_shallow_info(struct upload_pack_data *data)
1759 {
1760 /* No shallow info needs to be sent */
1761 if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1762 !is_repository_shallow(the_repository))
1763 return;
1764
1765 packet_writer_write(&data->writer, "shallow-info\n");
1766
1767 if (!send_shallow_list(data) &&
1768 is_repository_shallow(the_repository))
1769 deepen(data, INFINITE_DEPTH);
1770
1771 packet_delim(1);
1772 }
1773
1774 enum fetch_state {
1775 FETCH_PROCESS_ARGS = 0,
1776 FETCH_SEND_ACKS,
1777 FETCH_SEND_PACK,
1778 FETCH_DONE,
1779 };
1780
1781 int upload_pack_v2(struct repository *r, struct packet_reader *request)
1782 {
1783 enum fetch_state state = FETCH_PROCESS_ARGS;
1784 struct upload_pack_data data;
1785
1786 clear_object_flags(ALL_FLAGS);
1787
1788 upload_pack_data_init(&data);
1789 data.use_sideband = LARGE_PACKET_MAX;
1790 get_upload_pack_config(r, &data);
1791
1792 while (state != FETCH_DONE) {
1793 switch (state) {
1794 case FETCH_PROCESS_ARGS:
1795 process_args(request, &data);
1796
1797 if (!data.want_obj.nr && !data.wait_for_done) {
1798 /*
1799 * Request didn't contain any 'want' lines (and
1800 * the request does not contain
1801 * "wait-for-done", in which it is reasonable
1802 * to just send 'have's without 'want's); guess
1803 * they didn't want anything.
1804 */
1805 state = FETCH_DONE;
1806 } else if (data.haves.nr) {
1807 /*
1808 * Request had 'have' lines, so lets ACK them.
1809 */
1810 state = FETCH_SEND_ACKS;
1811 } else {
1812 /*
1813 * Request had 'want's but no 'have's so we can
1814 * immedietly go to construct and send a pack.
1815 */
1816 state = FETCH_SEND_PACK;
1817 }
1818 break;
1819 case FETCH_SEND_ACKS:
1820 if (process_haves_and_send_acks(&data))
1821 state = FETCH_SEND_PACK;
1822 else
1823 state = FETCH_DONE;
1824 break;
1825 case FETCH_SEND_PACK:
1826 send_wanted_ref_info(&data);
1827 send_shallow_info(&data);
1828
1829 if (data.uri_protocols.nr) {
1830 create_pack_file(&data, &data.uri_protocols);
1831 } else {
1832 packet_writer_write(&data.writer, "packfile\n");
1833 create_pack_file(&data, NULL);
1834 }
1835 state = FETCH_DONE;
1836 break;
1837 case FETCH_DONE:
1838 continue;
1839 }
1840 }
1841
1842 upload_pack_data_clear(&data);
1843 return 0;
1844 }
1845
1846 int upload_pack_advertise(struct repository *r,
1847 struct strbuf *value)
1848 {
1849 struct upload_pack_data data;
1850
1851 upload_pack_data_init(&data);
1852 get_upload_pack_config(r, &data);
1853
1854 if (value) {
1855 strbuf_addstr(value, "shallow wait-for-done");
1856
1857 if (data.allow_filter)
1858 strbuf_addstr(value, " filter");
1859
1860 if (data.allow_ref_in_want)
1861 strbuf_addstr(value, " ref-in-want");
1862
1863 if (data.allow_sideband_all)
1864 strbuf_addstr(value, " sideband-all");
1865
1866 if (data.allow_packfile_uris)
1867 strbuf_addstr(value, " packfile-uris");
1868 }
1869
1870 upload_pack_data_clear(&data);
1871
1872 return 1;
1873 }
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