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Merge branch 'jk/send-email-translate-aliases'
[git/gitster.git] / upload-pack.c
blobf03ba3e98be736ca1b97ab0854ac45c915be683f
1 #define USE_THE_REPOSITORY_VARIABLE
2
3 #include "git-compat-util.h"
4 #include "config.h"
5 #include "environment.h"
6 #include "gettext.h"
7 #include "hex.h"
8 #include "refs.h"
9 #include "pkt-line.h"
10 #include "sideband.h"
11 #include "repository.h"
12 #include "object-store-ll.h"
13 #include "oid-array.h"
14 #include "object.h"
15 #include "commit.h"
16 #include "diff.h"
17 #include "revision.h"
18 #include "list-objects-filter-options.h"
19 #include "run-command.h"
20 #include "connect.h"
21 #include "sigchain.h"
22 #include "version.h"
23 #include "string-list.h"
24 #include "strvec.h"
25 #include "trace2.h"
26 #include "protocol.h"
27 #include "upload-pack.h"
28 #include "commit-graph.h"
29 #include "commit-reach.h"
30 #include "shallow.h"
31 #include "write-or-die.h"
32 #include "json-writer.h"
33 #include "strmap.h"
34
35 /* Remember to update object flag allocation in object.h */
36 #define THEY_HAVE (1u << 11)
37 #define OUR_REF (1u << 12)
38 #define WANTED (1u << 13)
39 #define COMMON_KNOWN (1u << 14)
40
41 #define SHALLOW (1u << 16)
42 #define NOT_SHALLOW (1u << 17)
43 #define CLIENT_SHALLOW (1u << 18)
44 #define HIDDEN_REF (1u << 19)
45
46 #define ALL_FLAGS (THEY_HAVE | OUR_REF | WANTED | COMMON_KNOWN | SHALLOW | \
47 NOT_SHALLOW | CLIENT_SHALLOW | HIDDEN_REF)
48
49 /* Enum for allowed unadvertised object request (UOR) */
50 enum allow_uor {
51 /* Allow specifying sha1 if it is a ref tip. */
52 ALLOW_TIP_SHA1 = 0x01,
53 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
54 ALLOW_REACHABLE_SHA1 = 0x02,
55 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
56 ALLOW_ANY_SHA1 = 0x07
57 };
58
59 /*
60 * Please annotate, and if possible group together, fields used only
61 * for protocol v0 or only for protocol v2.
62 */
63 struct upload_pack_data {
64 struct string_list symref; /* v0 only */
65 struct object_array want_obj;
66 struct object_array have_obj;
67 struct strmap wanted_refs; /* v2 only */
68 struct strvec hidden_refs;
69
70 struct object_array shallows;
71 struct oidset deepen_not;
72 struct object_array extra_edge_obj;
73 int depth;
74 timestamp_t deepen_since;
75 int deepen_rev_list;
76 int deepen_relative;
77 int keepalive;
78 int shallow_nr;
79 timestamp_t oldest_have;
80
81 unsigned int timeout; /* v0 only */
82 enum {
83 NO_MULTI_ACK = 0,
84 MULTI_ACK = 1,
85 MULTI_ACK_DETAILED = 2
86 } multi_ack; /* v0 only */
87
88 /* 0 for no sideband, otherwise DEFAULT_PACKET_MAX or LARGE_PACKET_MAX */
89 int use_sideband;
90
91 struct string_list uri_protocols;
92 enum allow_uor allow_uor;
93
94 struct list_objects_filter_options filter_options;
95 struct string_list allowed_filters;
96
97 struct packet_writer writer;
98
99 char *pack_objects_hook;
100
101 unsigned stateless_rpc : 1; /* v0 only */
102 unsigned no_done : 1; /* v0 only */
103 unsigned daemon_mode : 1; /* v0 only */
104 unsigned filter_capability_requested : 1; /* v0 only */
105
106 unsigned use_thin_pack : 1;
107 unsigned use_ofs_delta : 1;
108 unsigned no_progress : 1;
109 unsigned use_include_tag : 1;
110 unsigned wait_for_done : 1;
111 unsigned allow_filter : 1;
112 unsigned allow_filter_fallback : 1;
113 unsigned long tree_filter_max_depth;
114
115 unsigned done : 1; /* v2 only */
116 unsigned allow_ref_in_want : 1; /* v2 only */
117 unsigned allow_sideband_all : 1; /* v2 only */
118 unsigned seen_haves : 1; /* v2 only */
119 unsigned allow_packfile_uris : 1; /* v2 only */
120 unsigned advertise_sid : 1;
121 unsigned sent_capabilities : 1;
122 };
123
124 static void upload_pack_data_init(struct upload_pack_data *data)
125 {
126 struct string_list symref = STRING_LIST_INIT_DUP;
127 struct strmap wanted_refs = STRMAP_INIT;
128 struct strvec hidden_refs = STRVEC_INIT;
129 struct object_array want_obj = OBJECT_ARRAY_INIT;
130 struct object_array have_obj = OBJECT_ARRAY_INIT;
131 struct object_array shallows = OBJECT_ARRAY_INIT;
132 struct oidset deepen_not = OID_ARRAY_INIT;
133 struct string_list uri_protocols = STRING_LIST_INIT_DUP;
134 struct object_array extra_edge_obj = OBJECT_ARRAY_INIT;
135 struct string_list allowed_filters = STRING_LIST_INIT_DUP;
136
137 memset(data, 0, sizeof(*data));
138 data->symref = symref;
139 data->wanted_refs = wanted_refs;
140 data->hidden_refs = hidden_refs;
141 data->want_obj = want_obj;
142 data->have_obj = have_obj;
143 data->shallows = shallows;
144 data->deepen_not = deepen_not;
145 data->uri_protocols = uri_protocols;
146 data->extra_edge_obj = extra_edge_obj;
147 data->allowed_filters = allowed_filters;
148 data->allow_filter_fallback = 1;
149 data->tree_filter_max_depth = ULONG_MAX;
150 packet_writer_init(&data->writer, 1);
151 list_objects_filter_init(&data->filter_options);
152
153 data->keepalive = 5;
154 data->advertise_sid = 0;
155 }
156
157 static void upload_pack_data_clear(struct upload_pack_data *data)
158 {
159 string_list_clear(&data->symref, 1);
160 strmap_clear(&data->wanted_refs, 1);
161 strvec_clear(&data->hidden_refs);
162 object_array_clear(&data->want_obj);
163 object_array_clear(&data->have_obj);
164 object_array_clear(&data->shallows);
165 oidset_clear(&data->deepen_not);
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, strlen(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_with_flags(the_repository, oid,
476 PARSE_OBJECT_SKIP_HASH_CHECK |
477 PARSE_OBJECT_DISCARD_TREE);
478
479 if (!o)
480 die("oops (%s)", oid_to_hex(oid));
481 if (o->type == OBJ_COMMIT) {
482 struct commit_list *parents;
483 struct commit *commit = (struct commit *)o;
484 if (o->flags & THEY_HAVE)
485 we_knew_they_have = 1;
486 else
487 o->flags |= THEY_HAVE;
488 if (!data->oldest_have || (commit->date < data->oldest_have))
489 data->oldest_have = commit->date;
490 for (parents = commit->parents;
491 parents;
492 parents = parents->next)
493 parents->item->object.flags |= THEY_HAVE;
494 }
495 if (!we_knew_they_have) {
496 add_object_array(o, NULL, &data->have_obj);
497 return 1;
498 }
499 return 0;
500 }
501
502 static int got_oid(struct upload_pack_data *data,
503 const char *hex, struct object_id *oid)
504 {
505 if (get_oid_hex(hex, oid))
506 die("git upload-pack: expected SHA1 object, got '%s'", hex);
507 if (!repo_has_object_file_with_flags(the_repository, oid,
508 OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
509 return -1;
510 return do_got_oid(data, oid);
511 }
512
513 static int ok_to_give_up(struct upload_pack_data *data)
514 {
515 timestamp_t min_generation = GENERATION_NUMBER_ZERO;
516
517 if (!data->have_obj.nr)
518 return 0;
519
520 return can_all_from_reach_with_flag(&data->want_obj, THEY_HAVE,
521 COMMON_KNOWN, data->oldest_have,
522 min_generation);
523 }
524
525 static int get_common_commits(struct upload_pack_data *data,
526 struct packet_reader *reader)
527 {
528 struct object_id oid;
529 char last_hex[GIT_MAX_HEXSZ + 1];
530 int got_common = 0;
531 int got_other = 0;
532 int sent_ready = 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 refs_for_each_namespaced_ref(get_main_ref_store(the_repository),
624 excludes, fn, data);
625 }
626
627
628 static int is_our_ref(struct object *o, enum allow_uor allow_uor)
629 {
630 return o->flags & ((allow_hidden_refs(allow_uor) ? 0 : HIDDEN_REF) | OUR_REF);
631 }
632
633 /*
634 * on successful case, it's up to the caller to close cmd->out
635 */
636 static int do_reachable_revlist(struct child_process *cmd,
637 struct object_array *src,
638 struct object_array *reachable,
639 enum allow_uor allow_uor)
640 {
641 struct object *o;
642 FILE *cmd_in = NULL;
643 int i;
644
645 strvec_pushl(&cmd->args, "rev-list", "--stdin", NULL);
646 cmd->git_cmd = 1;
647 cmd->no_stderr = 1;
648 cmd->in = -1;
649 cmd->out = -1;
650
651 /*
652 * If the next rev-list --stdin encounters an unknown commit,
653 * it terminates, which will cause SIGPIPE in the write loop
654 * below.
655 */
656 sigchain_push(SIGPIPE, SIG_IGN);
657
658 if (start_command(cmd))
659 goto error;
660
661 cmd_in = xfdopen(cmd->in, "w");
662
663 for (i = get_max_object_index(); 0 < i; ) {
664 o = get_indexed_object(--i);
665 if (!o)
666 continue;
667 if (reachable && o->type == OBJ_COMMIT)
668 o->flags &= ~TMP_MARK;
669 if (!is_our_ref(o, allow_uor))
670 continue;
671 if (fprintf(cmd_in, "^%s\n", oid_to_hex(&o->oid)) < 0)
672 goto error;
673 }
674 for (i = 0; i < src->nr; i++) {
675 o = src->objects[i].item;
676 if (is_our_ref(o, allow_uor)) {
677 if (reachable)
678 add_object_array(o, NULL, reachable);
679 continue;
680 }
681 if (reachable && o->type == OBJ_COMMIT)
682 o->flags |= TMP_MARK;
683 if (fprintf(cmd_in, "%s\n", oid_to_hex(&o->oid)) < 0)
684 goto error;
685 }
686 if (ferror(cmd_in) || fflush(cmd_in))
687 goto error;
688 fclose(cmd_in);
689 cmd->in = -1;
690 sigchain_pop(SIGPIPE);
691
692 return 0;
693
694 error:
695 sigchain_pop(SIGPIPE);
696
697 if (cmd_in)
698 fclose(cmd_in);
699 if (cmd->out >= 0)
700 close(cmd->out);
701 return -1;
702 }
703
704 static int get_reachable_list(struct upload_pack_data *data,
705 struct object_array *reachable)
706 {
707 struct child_process cmd = CHILD_PROCESS_INIT;
708 int i;
709 struct object *o;
710 char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
711 const unsigned hexsz = the_hash_algo->hexsz;
712
713 if (do_reachable_revlist(&cmd, &data->shallows, reachable,
714 data->allow_uor) < 0)
715 return -1;
716
717 while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
718 struct object_id oid;
719 const char *p;
720
721 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
722 break;
723
724 o = lookup_object(the_repository, &oid);
725 if (o && o->type == OBJ_COMMIT) {
726 o->flags &= ~TMP_MARK;
727 }
728 }
729 for (i = get_max_object_index(); 0 < i; i--) {
730 o = get_indexed_object(i - 1);
731 if (o && o->type == OBJ_COMMIT &&
732 (o->flags & TMP_MARK)) {
733 add_object_array(o, NULL, reachable);
734 o->flags &= ~TMP_MARK;
735 }
736 }
737 close(cmd.out);
738
739 if (finish_command(&cmd))
740 return -1;
741
742 return 0;
743 }
744
745 static int has_unreachable(struct object_array *src, enum allow_uor allow_uor)
746 {
747 struct child_process cmd = CHILD_PROCESS_INIT;
748 char buf[1];
749 int i;
750
751 if (do_reachable_revlist(&cmd, src, NULL, allow_uor) < 0)
752 return 1;
753
754 /*
755 * The commits out of the rev-list are not ancestors of
756 * our ref.
757 */
758 i = read_in_full(cmd.out, buf, 1);
759 if (i)
760 goto error;
761 close(cmd.out);
762 cmd.out = -1;
763
764 /*
765 * rev-list may have died by encountering a bad commit
766 * in the history, in which case we do want to bail out
767 * even when it showed no commit.
768 */
769 if (finish_command(&cmd))
770 goto error;
771
772 /* All the non-tip ones are ancestors of what we advertised */
773 return 0;
774
775 error:
776 if (cmd.out >= 0)
777 close(cmd.out);
778 return 1;
779 }
780
781 static void check_non_tip(struct upload_pack_data *data)
782 {
783 int i;
784
785 /*
786 * In the normal in-process case without
787 * uploadpack.allowReachableSHA1InWant,
788 * non-tip requests can never happen.
789 */
790 if (!data->stateless_rpc && !(data->allow_uor & ALLOW_REACHABLE_SHA1))
791 goto error;
792 if (!has_unreachable(&data->want_obj, data->allow_uor))
793 /* All the non-tip ones are ancestors of what we advertised */
794 return;
795
796 error:
797 /* Pick one of them (we know there at least is one) */
798 for (i = 0; i < data->want_obj.nr; i++) {
799 struct object *o = data->want_obj.objects[i].item;
800 if (!is_our_ref(o, data->allow_uor)) {
801 error("git upload-pack: not our ref %s",
802 oid_to_hex(&o->oid));
803 packet_writer_error(&data->writer,
804 "upload-pack: not our ref %s",
805 oid_to_hex(&o->oid));
806 exit(128);
807 }
808 }
809 }
810
811 static void send_shallow(struct upload_pack_data *data,
812 struct commit_list *result)
813 {
814 while (result) {
815 struct object *object = &result->item->object;
816 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
817 packet_writer_write(&data->writer, "shallow %s",
818 oid_to_hex(&object->oid));
819 register_shallow(the_repository, &object->oid);
820 data->shallow_nr++;
821 }
822 result = result->next;
823 }
824 }
825
826 static void send_unshallow(struct upload_pack_data *data)
827 {
828 int i;
829
830 for (i = 0; i < data->shallows.nr; i++) {
831 struct object *object = data->shallows.objects[i].item;
832 if (object->flags & NOT_SHALLOW) {
833 struct commit_list *parents;
834 packet_writer_write(&data->writer, "unshallow %s",
835 oid_to_hex(&object->oid));
836 object->flags &= ~CLIENT_SHALLOW;
837 /*
838 * We want to _register_ "object" as shallow, but we
839 * also need to traverse object's parents to deepen a
840 * shallow clone. Unregister it for now so we can
841 * parse and add the parents to the want list, then
842 * re-register it.
843 */
844 unregister_shallow(&object->oid);
845 object->parsed = 0;
846 parse_commit_or_die((struct commit *)object);
847 parents = ((struct commit *)object)->parents;
848 while (parents) {
849 add_object_array(&parents->item->object,
850 NULL, &data->want_obj);
851 parents = parents->next;
852 }
853 add_object_array(object, NULL, &data->extra_edge_obj);
854 }
855 /* make sure commit traversal conforms to client */
856 register_shallow(the_repository, &object->oid);
857 }
858 }
859
860 static int check_ref(const char *refname_full, const char *referent UNUSED, const struct object_id *oid,
861 int flag, void *cb_data);
862 static void deepen(struct upload_pack_data *data, int depth)
863 {
864 if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
865 int i;
866
867 for (i = 0; i < data->shallows.nr; i++) {
868 struct object *object = data->shallows.objects[i].item;
869 object->flags |= NOT_SHALLOW;
870 }
871 } else if (data->deepen_relative) {
872 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
873 struct commit_list *result;
874
875 /*
876 * Checking for reachable shallows requires that our refs be
877 * marked with OUR_REF.
878 */
879 refs_head_ref_namespaced(get_main_ref_store(the_repository),
880 check_ref, data);
881 for_each_namespaced_ref_1(check_ref, data);
882
883 get_reachable_list(data, &reachable_shallows);
884 result = get_shallow_commits(&reachable_shallows,
885 depth + 1,
886 SHALLOW, NOT_SHALLOW);
887 send_shallow(data, result);
888 free_commit_list(result);
889 object_array_clear(&reachable_shallows);
890 } else {
891 struct commit_list *result;
892
893 result = get_shallow_commits(&data->want_obj, depth,
894 SHALLOW, NOT_SHALLOW);
895 send_shallow(data, result);
896 free_commit_list(result);
897 }
898
899 send_unshallow(data);
900 }
901
902 static void deepen_by_rev_list(struct upload_pack_data *data,
903 int ac,
904 const char **av)
905 {
906 struct commit_list *result;
907
908 disable_commit_graph(the_repository);
909 result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
910 send_shallow(data, result);
911 free_commit_list(result);
912 send_unshallow(data);
913 }
914
915 /* Returns 1 if a shallow list is sent or 0 otherwise */
916 static int send_shallow_list(struct upload_pack_data *data)
917 {
918 int ret = 0;
919
920 if (data->depth > 0 && data->deepen_rev_list)
921 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
922 if (data->depth > 0) {
923 deepen(data, data->depth);
924 ret = 1;
925 } else if (data->deepen_rev_list) {
926 struct strvec av = STRVEC_INIT;
927 int i;
928
929 strvec_push(&av, "rev-list");
930 if (data->deepen_since)
931 strvec_pushf(&av, "--max-age=%"PRItime, data->deepen_since);
932 if (oidset_size(&data->deepen_not)) {
933 const struct object_id *oid;
934 struct oidset_iter iter;
935 strvec_push(&av, "--not");
936 oidset_iter_init(&data->deepen_not, &iter);
937 while ((oid = oidset_iter_next(&iter)))
938 strvec_push(&av, oid_to_hex(oid));
939 strvec_push(&av, "--not");
940 }
941 for (i = 0; i < data->want_obj.nr; i++) {
942 struct object *o = data->want_obj.objects[i].item;
943 strvec_push(&av, oid_to_hex(&o->oid));
944 }
945 deepen_by_rev_list(data, av.nr, av.v);
946 strvec_clear(&av);
947 ret = 1;
948 } else {
949 if (data->shallows.nr > 0) {
950 int i;
951 for (i = 0; i < data->shallows.nr; i++)
952 register_shallow(the_repository,
953 &data->shallows.objects[i].item->oid);
954 }
955 }
956
957 data->shallow_nr += data->shallows.nr;
958 return ret;
959 }
960
961 static int process_shallow(const char *line, struct object_array *shallows)
962 {
963 const char *arg;
964 if (skip_prefix(line, "shallow ", &arg)) {
965 struct object_id oid;
966 struct object *object;
967 if (get_oid_hex(arg, &oid))
968 die("invalid shallow line: %s", line);
969 object = parse_object(the_repository, &oid);
970 if (!object)
971 return 1;
972 if (object->type != OBJ_COMMIT)
973 die("invalid shallow object %s", oid_to_hex(&oid));
974 if (!(object->flags & CLIENT_SHALLOW)) {
975 object->flags |= CLIENT_SHALLOW;
976 add_object_array(object, NULL, shallows);
977 }
978 return 1;
979 }
980
981 return 0;
982 }
983
984 static int process_deepen(const char *line, int *depth)
985 {
986 const char *arg;
987 if (skip_prefix(line, "deepen ", &arg)) {
988 char *end = NULL;
989 *depth = (int)strtol(arg, &end, 0);
990 if (!end || *end || *depth <= 0)
991 die("Invalid deepen: %s", line);
992 return 1;
993 }
994
995 return 0;
996 }
997
998 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
999 {
1000 const char *arg;
1001 if (skip_prefix(line, "deepen-since ", &arg)) {
1002 char *end = NULL;
1003 *deepen_since = parse_timestamp(arg, &end, 0);
1004 if (!end || *end || !deepen_since ||
1005 /* revisions.c's max_age -1 is special */
1006 *deepen_since == -1)
1007 die("Invalid deepen-since: %s", line);
1008 *deepen_rev_list = 1;
1009 return 1;
1010 }
1011 return 0;
1012 }
1013
1014 static int process_deepen_not(const char *line, struct oidset *deepen_not, int *deepen_rev_list)
1015 {
1016 const char *arg;
1017 if (skip_prefix(line, "deepen-not ", &arg)) {
1018 char *ref = NULL;
1019 struct object_id oid;
1020 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
1021 die("git upload-pack: ambiguous deepen-not: %s", line);
1022 oidset_insert(deepen_not, &oid);
1023 free(ref);
1024 *deepen_rev_list = 1;
1025 return 1;
1026 }
1027 return 0;
1028 }
1029
1030 NORETURN __attribute__((format(printf,2,3)))
1031 static void send_err_and_die(struct upload_pack_data *data,
1032 const char *fmt, ...)
1033 {
1034 struct strbuf buf = STRBUF_INIT;
1035 va_list ap;
1036
1037 va_start(ap, fmt);
1038 strbuf_vaddf(&buf, fmt, ap);
1039 va_end(ap);
1040
1041 packet_writer_error(&data->writer, "%s", buf.buf);
1042 die("%s", buf.buf);
1043 }
1044
1045 static void check_one_filter(struct upload_pack_data *data,
1046 struct list_objects_filter_options *opts)
1047 {
1048 const char *key = list_object_filter_config_name(opts->choice);
1049 struct string_list_item *item = string_list_lookup(&data->allowed_filters,
1050 key);
1051 int allowed;
1052
1053 if (item)
1054 allowed = (intptr_t)item->util;
1055 else
1056 allowed = data->allow_filter_fallback;
1057
1058 if (!allowed)
1059 send_err_and_die(data, "filter '%s' not supported", key);
1060
1061 if (opts->choice == LOFC_TREE_DEPTH &&
1062 opts->tree_exclude_depth > data->tree_filter_max_depth)
1063 send_err_and_die(data,
1064 "tree filter allows max depth %lu, but got %lu",
1065 data->tree_filter_max_depth,
1066 opts->tree_exclude_depth);
1067 }
1068
1069 static void check_filter_recurse(struct upload_pack_data *data,
1070 struct list_objects_filter_options *opts)
1071 {
1072 size_t i;
1073
1074 check_one_filter(data, opts);
1075 if (opts->choice != LOFC_COMBINE)
1076 return;
1077
1078 for (i = 0; i < opts->sub_nr; i++)
1079 check_filter_recurse(data, &opts->sub[i]);
1080 }
1081
1082 static void die_if_using_banned_filter(struct upload_pack_data *data)
1083 {
1084 check_filter_recurse(data, &data->filter_options);
1085 }
1086
1087 static void receive_needs(struct upload_pack_data *data,
1088 struct packet_reader *reader)
1089 {
1090 int has_non_tip = 0;
1091
1092 data->shallow_nr = 0;
1093 for (;;) {
1094 struct object *o;
1095 const char *features;
1096 struct object_id oid_buf;
1097 const char *arg;
1098 size_t feature_len;
1099
1100 reset_timeout(data->timeout);
1101 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
1102 break;
1103
1104 if (process_shallow(reader->line, &data->shallows))
1105 continue;
1106 if (process_deepen(reader->line, &data->depth))
1107 continue;
1108 if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
1109 continue;
1110 if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
1111 continue;
1112
1113 if (skip_prefix(reader->line, "filter ", &arg)) {
1114 if (!data->filter_capability_requested)
1115 die("git upload-pack: filtering capability not negotiated");
1116 list_objects_filter_die_if_populated(&data->filter_options);
1117 parse_list_objects_filter(&data->filter_options, arg);
1118 die_if_using_banned_filter(data);
1119 continue;
1120 }
1121
1122 if (!skip_prefix(reader->line, "want ", &arg) ||
1123 parse_oid_hex(arg, &oid_buf, &features))
1124 die("git upload-pack: protocol error, "
1125 "expected to get object ID, not '%s'", reader->line);
1126
1127 if (parse_feature_request(features, "deepen-relative"))
1128 data->deepen_relative = 1;
1129 if (parse_feature_request(features, "multi_ack_detailed"))
1130 data->multi_ack = MULTI_ACK_DETAILED;
1131 else if (parse_feature_request(features, "multi_ack"))
1132 data->multi_ack = MULTI_ACK;
1133 if (parse_feature_request(features, "no-done"))
1134 data->no_done = 1;
1135 if (parse_feature_request(features, "thin-pack"))
1136 data->use_thin_pack = 1;
1137 if (parse_feature_request(features, "ofs-delta"))
1138 data->use_ofs_delta = 1;
1139 if (parse_feature_request(features, "side-band-64k"))
1140 data->use_sideband = LARGE_PACKET_MAX;
1141 else if (parse_feature_request(features, "side-band"))
1142 data->use_sideband = DEFAULT_PACKET_MAX;
1143 if (parse_feature_request(features, "no-progress"))
1144 data->no_progress = 1;
1145 if (parse_feature_request(features, "include-tag"))
1146 data->use_include_tag = 1;
1147 if (data->allow_filter &&
1148 parse_feature_request(features, "filter"))
1149 data->filter_capability_requested = 1;
1150
1151 arg = parse_feature_value(features, "session-id", &feature_len, NULL);
1152 if (arg) {
1153 char *client_sid = xstrndup(arg, feature_len);
1154 trace2_data_string("transfer", NULL, "client-sid", client_sid);
1155 free(client_sid);
1156 }
1157
1158 o = parse_object_with_flags(the_repository, &oid_buf,
1159 PARSE_OBJECT_SKIP_HASH_CHECK |
1160 PARSE_OBJECT_DISCARD_TREE);
1161 if (!o) {
1162 packet_writer_error(&data->writer,
1163 "upload-pack: not our ref %s",
1164 oid_to_hex(&oid_buf));
1165 die("git upload-pack: not our ref %s",
1166 oid_to_hex(&oid_buf));
1167 }
1168 if (!(o->flags & WANTED)) {
1169 o->flags |= WANTED;
1170 if (!((data->allow_uor & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
1171 || is_our_ref(o, data->allow_uor)))
1172 has_non_tip = 1;
1173 add_object_array(o, NULL, &data->want_obj);
1174 }
1175 }
1176
1177 /*
1178 * We have sent all our refs already, and the other end
1179 * should have chosen out of them. When we are operating
1180 * in the stateless RPC mode, however, their choice may
1181 * have been based on the set of older refs advertised
1182 * by another process that handled the initial request.
1183 */
1184 if (has_non_tip)
1185 check_non_tip(data);
1186
1187 if (!data->use_sideband && data->daemon_mode)
1188 data->no_progress = 1;
1189
1190 if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1191 return;
1192
1193 if (send_shallow_list(data))
1194 packet_flush(1);
1195 }
1196
1197 /* return non-zero if the ref is hidden, otherwise 0 */
1198 static int mark_our_ref(const char *refname, const char *refname_full,
1199 const struct object_id *oid, const struct strvec *hidden_refs)
1200 {
1201 struct object *o = lookup_unknown_object(the_repository, oid);
1202
1203 if (ref_is_hidden(refname, refname_full, hidden_refs)) {
1204 o->flags |= HIDDEN_REF;
1205 return 1;
1206 }
1207 o->flags |= OUR_REF;
1208 return 0;
1209 }
1210
1211 static int check_ref(const char *refname_full, const char *referent UNUSED,const struct object_id *oid,
1212 int flag UNUSED, void *cb_data)
1213 {
1214 const char *refname = strip_namespace(refname_full);
1215 struct upload_pack_data *data = cb_data;
1216
1217 mark_our_ref(refname, refname_full, oid, &data->hidden_refs);
1218 return 0;
1219 }
1220
1221 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1222 {
1223 struct string_list_item *item;
1224
1225 if (!symref->nr)
1226 return;
1227 for_each_string_list_item(item, symref)
1228 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1229 }
1230
1231 static void format_session_id(struct strbuf *buf, struct upload_pack_data *d) {
1232 if (d->advertise_sid)
1233 strbuf_addf(buf, " session-id=%s", trace2_session_id());
1234 }
1235
1236 static void write_v0_ref(struct upload_pack_data *data,
1237 const char *refname, const char *refname_nons,
1238 const struct object_id *oid)
1239 {
1240 static const char *capabilities = "multi_ack thin-pack side-band"
1241 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1242 " deepen-relative no-progress include-tag multi_ack_detailed";
1243 struct object_id peeled;
1244
1245 if (mark_our_ref(refname_nons, refname, oid, &data->hidden_refs))
1246 return;
1247
1248 if (capabilities) {
1249 struct strbuf symref_info = STRBUF_INIT;
1250 struct strbuf session_id = STRBUF_INIT;
1251
1252 format_symref_info(&symref_info, &data->symref);
1253 format_session_id(&session_id, data);
1254 packet_fwrite_fmt(stdout, "%s %s%c%s%s%s%s%s%s%s object-format=%s agent=%s\n",
1255 oid_to_hex(oid), refname_nons,
1256 0, capabilities,
1257 (data->allow_uor & ALLOW_TIP_SHA1) ?
1258 " allow-tip-sha1-in-want" : "",
1259 (data->allow_uor & ALLOW_REACHABLE_SHA1) ?
1260 " allow-reachable-sha1-in-want" : "",
1261 data->no_done ? " no-done" : "",
1262 symref_info.buf,
1263 data->allow_filter ? " filter" : "",
1264 session_id.buf,
1265 the_hash_algo->name,
1266 git_user_agent_sanitized());
1267 strbuf_release(&symref_info);
1268 strbuf_release(&session_id);
1269 data->sent_capabilities = 1;
1270 } else {
1271 packet_fwrite_fmt(stdout, "%s %s\n", oid_to_hex(oid), refname_nons);
1272 }
1273 capabilities = NULL;
1274 if (!peel_iterated_oid(the_repository, oid, &peeled))
1275 packet_fwrite_fmt(stdout, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1276 return;
1277 }
1278
1279 static int send_ref(const char *refname, const char *referent UNUSED, const struct object_id *oid,
1280 int flag UNUSED, void *cb_data)
1281 {
1282 write_v0_ref(cb_data, refname, strip_namespace(refname), oid);
1283 return 0;
1284 }
1285
1286 static int find_symref(const char *refname, const char *referent UNUSED,
1287 const struct object_id *oid UNUSED,
1288 int flag, void *cb_data)
1289 {
1290 const char *symref_target;
1291 struct string_list_item *item;
1292
1293 if ((flag & REF_ISSYMREF) == 0)
1294 return 0;
1295 symref_target = refs_resolve_ref_unsafe(get_main_ref_store(the_repository),
1296 refname, 0, NULL, &flag);
1297 if (!symref_target || (flag & REF_ISSYMREF) == 0)
1298 die("'%s' is a symref but it is not?", refname);
1299 item = string_list_append(cb_data, strip_namespace(refname));
1300 item->util = xstrdup(strip_namespace(symref_target));
1301 return 0;
1302 }
1303
1304 static int parse_object_filter_config(const char *var, const char *value,
1305 const struct key_value_info *kvi,
1306 struct upload_pack_data *data)
1307 {
1308 struct strbuf buf = STRBUF_INIT;
1309 const char *sub, *key;
1310 size_t sub_len;
1311
1312 if (parse_config_key(var, "uploadpackfilter", &sub, &sub_len, &key))
1313 return 0;
1314
1315 if (!sub) {
1316 if (!strcmp(key, "allow"))
1317 data->allow_filter_fallback = git_config_bool(var, value);
1318 return 0;
1319 }
1320
1321 strbuf_add(&buf, sub, sub_len);
1322
1323 if (!strcmp(key, "allow"))
1324 string_list_insert(&data->allowed_filters, buf.buf)->util =
1325 (void *)(intptr_t)git_config_bool(var, value);
1326 else if (!strcmp(buf.buf, "tree") && !strcmp(key, "maxdepth")) {
1327 if (!value) {
1328 strbuf_release(&buf);
1329 return config_error_nonbool(var);
1330 }
1331 string_list_insert(&data->allowed_filters, buf.buf)->util =
1332 (void *)(intptr_t)1;
1333 data->tree_filter_max_depth = git_config_ulong(var, value,
1334 kvi);
1335 }
1336
1337 strbuf_release(&buf);
1338 return 0;
1339 }
1340
1341 static int upload_pack_config(const char *var, const char *value,
1342 const struct config_context *ctx,
1343 void *cb_data)
1344 {
1345 struct upload_pack_data *data = cb_data;
1346
1347 if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1348 if (git_config_bool(var, value))
1349 data->allow_uor |= ALLOW_TIP_SHA1;
1350 else
1351 data->allow_uor &= ~ALLOW_TIP_SHA1;
1352 } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1353 if (git_config_bool(var, value))
1354 data->allow_uor |= ALLOW_REACHABLE_SHA1;
1355 else
1356 data->allow_uor &= ~ALLOW_REACHABLE_SHA1;
1357 } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1358 if (git_config_bool(var, value))
1359 data->allow_uor |= ALLOW_ANY_SHA1;
1360 else
1361 data->allow_uor &= ~ALLOW_ANY_SHA1;
1362 } else if (!strcmp("uploadpack.keepalive", var)) {
1363 data->keepalive = git_config_int(var, value, ctx->kvi);
1364 if (!data->keepalive)
1365 data->keepalive = -1;
1366 } else if (!strcmp("uploadpack.allowfilter", var)) {
1367 data->allow_filter = git_config_bool(var, value);
1368 } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1369 data->allow_ref_in_want = git_config_bool(var, value);
1370 } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1371 data->allow_sideband_all = git_config_bool(var, value);
1372 } else if (!strcmp("uploadpack.blobpackfileuri", var)) {
1373 if (value)
1374 data->allow_packfile_uris = 1;
1375 } else if (!strcmp("core.precomposeunicode", var)) {
1376 precomposed_unicode = git_config_bool(var, value);
1377 } else if (!strcmp("transfer.advertisesid", var)) {
1378 data->advertise_sid = git_config_bool(var, value);
1379 }
1380
1381 if (parse_object_filter_config(var, value, ctx->kvi, data) < 0)
1382 return -1;
1383
1384 return parse_hide_refs_config(var, value, "uploadpack", &data->hidden_refs);
1385 }
1386
1387 static int upload_pack_protected_config(const char *var, const char *value,
1388 const struct config_context *ctx UNUSED,
1389 void *cb_data)
1390 {
1391 struct upload_pack_data *data = cb_data;
1392
1393 if (!strcmp("uploadpack.packobjectshook", var))
1394 return git_config_string(&data->pack_objects_hook, var, value);
1395 return 0;
1396 }
1397
1398 static void get_upload_pack_config(struct repository *r,
1399 struct upload_pack_data *data)
1400 {
1401 repo_config(r, upload_pack_config, data);
1402 git_protected_config(upload_pack_protected_config, data);
1403
1404 data->allow_sideband_all |= git_env_bool("GIT_TEST_SIDEBAND_ALL", 0);
1405 }
1406
1407 void upload_pack(const int advertise_refs, const int stateless_rpc,
1408 const int timeout)
1409 {
1410 struct packet_reader reader;
1411 struct upload_pack_data data;
1412
1413 upload_pack_data_init(&data);
1414 get_upload_pack_config(the_repository, &data);
1415
1416 data.stateless_rpc = stateless_rpc;
1417 data.timeout = timeout;
1418 if (data.timeout)
1419 data.daemon_mode = 1;
1420
1421 refs_head_ref_namespaced(get_main_ref_store(the_repository),
1422 find_symref, &data.symref);
1423
1424 if (advertise_refs || !data.stateless_rpc) {
1425 reset_timeout(data.timeout);
1426 if (advertise_refs)
1427 data.no_done = 1;
1428 refs_head_ref_namespaced(get_main_ref_store(the_repository),
1429 send_ref, &data);
1430 for_each_namespaced_ref_1(send_ref, &data);
1431 if (!data.sent_capabilities) {
1432 const char *refname = "capabilities^{}";
1433 write_v0_ref(&data, refname, refname, null_oid());
1434 }
1435 /*
1436 * fflush stdout before calling advertise_shallow_grafts because send_ref
1437 * uses stdio.
1438 */
1439 fflush_or_die(stdout);
1440 advertise_shallow_grafts(1);
1441 packet_flush(1);
1442 } else {
1443 refs_head_ref_namespaced(get_main_ref_store(the_repository),
1444 check_ref, &data);
1445 for_each_namespaced_ref_1(check_ref, &data);
1446 }
1447
1448 if (!advertise_refs) {
1449 packet_reader_init(&reader, 0, NULL, 0,
1450 PACKET_READ_CHOMP_NEWLINE |
1451 PACKET_READ_DIE_ON_ERR_PACKET);
1452
1453 receive_needs(&data, &reader);
1454
1455 /*
1456 * An EOF at this exact point in negotiation should be
1457 * acceptable from stateless clients as they will consume the
1458 * shallow list before doing subsequent rpc with haves/etc.
1459 */
1460 if (data.stateless_rpc)
1461 reader.options |= PACKET_READ_GENTLE_ON_EOF;
1462
1463 if (data.want_obj.nr &&
1464 packet_reader_peek(&reader) != PACKET_READ_EOF) {
1465 reader.options &= ~PACKET_READ_GENTLE_ON_EOF;
1466 get_common_commits(&data, &reader);
1467 create_pack_file(&data, NULL);
1468 }
1469 }
1470
1471 upload_pack_data_clear(&data);
1472 }
1473
1474 static int parse_want(struct packet_writer *writer, const char *line,
1475 struct object_array *want_obj)
1476 {
1477 const char *arg;
1478 if (skip_prefix(line, "want ", &arg)) {
1479 struct object_id oid;
1480 struct object *o;
1481
1482 if (get_oid_hex(arg, &oid))
1483 die("git upload-pack: protocol error, "
1484 "expected to get oid, not '%s'", line);
1485
1486 o = parse_object_with_flags(the_repository, &oid,
1487 PARSE_OBJECT_SKIP_HASH_CHECK |
1488 PARSE_OBJECT_DISCARD_TREE);
1489
1490 if (!o) {
1491 packet_writer_error(writer,
1492 "upload-pack: not our ref %s",
1493 oid_to_hex(&oid));
1494 die("git upload-pack: not our ref %s",
1495 oid_to_hex(&oid));
1496 }
1497
1498 if (!(o->flags & WANTED)) {
1499 o->flags |= WANTED;
1500 add_object_array(o, NULL, want_obj);
1501 }
1502
1503 return 1;
1504 }
1505
1506 return 0;
1507 }
1508
1509 static int parse_want_ref(struct packet_writer *writer, const char *line,
1510 struct strmap *wanted_refs,
1511 struct strvec *hidden_refs,
1512 struct object_array *want_obj)
1513 {
1514 const char *refname_nons;
1515 if (skip_prefix(line, "want-ref ", &refname_nons)) {
1516 struct object_id oid;
1517 struct object *o = NULL;
1518 struct strbuf refname = STRBUF_INIT;
1519
1520 strbuf_addf(&refname, "%s%s", get_git_namespace(), refname_nons);
1521 if (ref_is_hidden(refname_nons, refname.buf, hidden_refs) ||
1522 refs_read_ref(get_main_ref_store(the_repository), refname.buf, &oid)) {
1523 packet_writer_error(writer, "unknown ref %s", refname_nons);
1524 die("unknown ref %s", refname_nons);
1525 }
1526 strbuf_release(&refname);
1527
1528 if (strmap_put(wanted_refs, refname_nons, oiddup(&oid))) {
1529 packet_writer_error(writer, "duplicate want-ref %s",
1530 refname_nons);
1531 die("duplicate want-ref %s", refname_nons);
1532 }
1533
1534 if (!starts_with(refname_nons, "refs/tags/")) {
1535 struct commit *commit = lookup_commit_in_graph(the_repository, &oid);
1536 if (commit)
1537 o = &commit->object;
1538 }
1539
1540 if (!o)
1541 o = parse_object_or_die(&oid, refname_nons);
1542
1543 if (!(o->flags & WANTED)) {
1544 o->flags |= WANTED;
1545 add_object_array(o, NULL, want_obj);
1546 }
1547
1548 return 1;
1549 }
1550
1551 return 0;
1552 }
1553
1554 static int parse_have(const char *line, struct upload_pack_data *data)
1555 {
1556 const char *arg;
1557 if (skip_prefix(line, "have ", &arg)) {
1558 struct object_id oid;
1559
1560 got_oid(data, arg, &oid);
1561 data->seen_haves = 1;
1562 return 1;
1563 }
1564
1565 return 0;
1566 }
1567
1568 static void trace2_fetch_info(struct upload_pack_data *data)
1569 {
1570 struct json_writer jw = JSON_WRITER_INIT;
1571
1572 jw_object_begin(&jw, 0);
1573 jw_object_intmax(&jw, "haves", data->have_obj.nr);
1574 jw_object_intmax(&jw, "wants", data->want_obj.nr);
1575 jw_object_intmax(&jw, "want-refs", strmap_get_size(&data->wanted_refs));
1576 jw_object_intmax(&jw, "depth", data->depth);
1577 jw_object_intmax(&jw, "shallows", data->shallows.nr);
1578 jw_object_bool(&jw, "deepen-since", data->deepen_since);
1579 jw_object_intmax(&jw, "deepen-not", oidset_size(&data->deepen_not));
1580 jw_object_bool(&jw, "deepen-relative", data->deepen_relative);
1581 if (data->filter_options.choice)
1582 jw_object_string(&jw, "filter", list_object_filter_config_name(data->filter_options.choice));
1583 else
1584 jw_object_null(&jw, "filter");
1585 jw_end(&jw);
1586
1587 trace2_data_json("upload-pack", the_repository, "fetch-info", &jw);
1588
1589 jw_release(&jw);
1590 }
1591
1592 static void process_args(struct packet_reader *request,
1593 struct upload_pack_data *data)
1594 {
1595 while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1596 const char *arg = request->line;
1597 const char *p;
1598
1599 /* process want */
1600 if (parse_want(&data->writer, arg, &data->want_obj))
1601 continue;
1602 if (data->allow_ref_in_want &&
1603 parse_want_ref(&data->writer, arg, &data->wanted_refs,
1604 &data->hidden_refs, &data->want_obj))
1605 continue;
1606 /* process have line */
1607 if (parse_have(arg, data))
1608 continue;
1609
1610 /* process args like thin-pack */
1611 if (!strcmp(arg, "thin-pack")) {
1612 data->use_thin_pack = 1;
1613 continue;
1614 }
1615 if (!strcmp(arg, "ofs-delta")) {
1616 data->use_ofs_delta = 1;
1617 continue;
1618 }
1619 if (!strcmp(arg, "no-progress")) {
1620 data->no_progress = 1;
1621 continue;
1622 }
1623 if (!strcmp(arg, "include-tag")) {
1624 data->use_include_tag = 1;
1625 continue;
1626 }
1627 if (!strcmp(arg, "done")) {
1628 data->done = 1;
1629 continue;
1630 }
1631 if (!strcmp(arg, "wait-for-done")) {
1632 data->wait_for_done = 1;
1633 continue;
1634 }
1635
1636 /* Shallow related arguments */
1637 if (process_shallow(arg, &data->shallows))
1638 continue;
1639 if (process_deepen(arg, &data->depth))
1640 continue;
1641 if (process_deepen_since(arg, &data->deepen_since,
1642 &data->deepen_rev_list))
1643 continue;
1644 if (process_deepen_not(arg, &data->deepen_not,
1645 &data->deepen_rev_list))
1646 continue;
1647 if (!strcmp(arg, "deepen-relative")) {
1648 data->deepen_relative = 1;
1649 continue;
1650 }
1651
1652 if (data->allow_filter && skip_prefix(arg, "filter ", &p)) {
1653 list_objects_filter_die_if_populated(&data->filter_options);
1654 parse_list_objects_filter(&data->filter_options, p);
1655 die_if_using_banned_filter(data);
1656 continue;
1657 }
1658
1659 if (data->allow_sideband_all &&
1660 !strcmp(arg, "sideband-all")) {
1661 data->writer.use_sideband = 1;
1662 continue;
1663 }
1664
1665 if (data->allow_packfile_uris &&
1666 skip_prefix(arg, "packfile-uris ", &p)) {
1667 if (data->uri_protocols.nr)
1668 send_err_and_die(data,
1669 "multiple packfile-uris lines forbidden");
1670 string_list_split(&data->uri_protocols, p, ',', -1);
1671 continue;
1672 }
1673
1674 /* ignore unknown lines maybe? */
1675 die("unexpected line: '%s'", arg);
1676 }
1677
1678 if (data->uri_protocols.nr && !data->writer.use_sideband)
1679 string_list_clear(&data->uri_protocols, 0);
1680
1681 if (request->status != PACKET_READ_FLUSH)
1682 die(_("expected flush after fetch arguments"));
1683
1684 if (trace2_is_enabled())
1685 trace2_fetch_info(data);
1686 }
1687
1688 static int send_acks(struct upload_pack_data *data, struct object_array *acks)
1689 {
1690 int i;
1691
1692 packet_writer_write(&data->writer, "acknowledgments\n");
1693
1694 /* Send Acks */
1695 if (!acks->nr)
1696 packet_writer_write(&data->writer, "NAK\n");
1697
1698 for (i = 0; i < acks->nr; i++) {
1699 packet_writer_write(&data->writer, "ACK %s\n",
1700 oid_to_hex(&acks->objects[i].item->oid));
1701 }
1702
1703 if (!data->wait_for_done && ok_to_give_up(data)) {
1704 /* Send Ready */
1705 packet_writer_write(&data->writer, "ready\n");
1706 return 1;
1707 }
1708
1709 return 0;
1710 }
1711
1712 static int process_haves_and_send_acks(struct upload_pack_data *data)
1713 {
1714 int ret = 0;
1715
1716 if (data->done) {
1717 ret = 1;
1718 } else if (send_acks(data, &data->have_obj)) {
1719 packet_writer_delim(&data->writer);
1720 ret = 1;
1721 } else {
1722 /* Add Flush */
1723 packet_writer_flush(&data->writer);
1724 ret = 0;
1725 }
1726
1727 return ret;
1728 }
1729
1730 static void send_wanted_ref_info(struct upload_pack_data *data)
1731 {
1732 struct hashmap_iter iter;
1733 const struct strmap_entry *e;
1734
1735 if (strmap_empty(&data->wanted_refs))
1736 return;
1737
1738 packet_writer_write(&data->writer, "wanted-refs\n");
1739
1740 strmap_for_each_entry(&data->wanted_refs, &iter, e) {
1741 packet_writer_write(&data->writer, "%s %s\n",
1742 oid_to_hex(e->value),
1743 e->key);
1744 }
1745
1746 packet_writer_delim(&data->writer);
1747 }
1748
1749 static void send_shallow_info(struct upload_pack_data *data)
1750 {
1751 /* No shallow info needs to be sent */
1752 if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1753 !is_repository_shallow(the_repository))
1754 return;
1755
1756 packet_writer_write(&data->writer, "shallow-info\n");
1757
1758 if (!send_shallow_list(data) &&
1759 is_repository_shallow(the_repository))
1760 deepen(data, INFINITE_DEPTH);
1761
1762 packet_delim(1);
1763 }
1764
1765 enum fetch_state {
1766 FETCH_PROCESS_ARGS = 0,
1767 FETCH_SEND_ACKS,
1768 FETCH_SEND_PACK,
1769 FETCH_DONE,
1770 };
1771
1772 int upload_pack_v2(struct repository *r, struct packet_reader *request)
1773 {
1774 enum fetch_state state = FETCH_PROCESS_ARGS;
1775 struct upload_pack_data data;
1776
1777 clear_object_flags(ALL_FLAGS);
1778
1779 upload_pack_data_init(&data);
1780 data.use_sideband = LARGE_PACKET_MAX;
1781 get_upload_pack_config(r, &data);
1782
1783 while (state != FETCH_DONE) {
1784 switch (state) {
1785 case FETCH_PROCESS_ARGS:
1786 process_args(request, &data);
1787
1788 if (!data.want_obj.nr && !data.wait_for_done) {
1789 /*
1790 * Request didn't contain any 'want' lines (and
1791 * the request does not contain
1792 * "wait-for-done", in which it is reasonable
1793 * to just send 'have's without 'want's); guess
1794 * they didn't want anything.
1795 */
1796 state = FETCH_DONE;
1797 } else if (data.seen_haves) {
1798 /*
1799 * Request had 'have' lines, so lets ACK them.
1800 */
1801 state = FETCH_SEND_ACKS;
1802 } else {
1803 /*
1804 * Request had 'want's but no 'have's so we can
1805 * immedietly go to construct and send a pack.
1806 */
1807 state = FETCH_SEND_PACK;
1808 }
1809 break;
1810 case FETCH_SEND_ACKS:
1811 if (process_haves_and_send_acks(&data))
1812 state = FETCH_SEND_PACK;
1813 else
1814 state = FETCH_DONE;
1815 break;
1816 case FETCH_SEND_PACK:
1817 send_wanted_ref_info(&data);
1818 send_shallow_info(&data);
1819
1820 if (data.uri_protocols.nr) {
1821 create_pack_file(&data, &data.uri_protocols);
1822 } else {
1823 packet_writer_write(&data.writer, "packfile\n");
1824 create_pack_file(&data, NULL);
1825 }
1826 state = FETCH_DONE;
1827 break;
1828 case FETCH_DONE:
1829 continue;
1830 }
1831 }
1832
1833 upload_pack_data_clear(&data);
1834 return 0;
1835 }
1836
1837 int upload_pack_advertise(struct repository *r,
1838 struct strbuf *value)
1839 {
1840 struct upload_pack_data data;
1841
1842 upload_pack_data_init(&data);
1843 get_upload_pack_config(r, &data);
1844
1845 if (value) {
1846 strbuf_addstr(value, "shallow wait-for-done");
1847
1848 if (data.allow_filter)
1849 strbuf_addstr(value, " filter");
1850
1851 if (data.allow_ref_in_want)
1852 strbuf_addstr(value, " ref-in-want");
1853
1854 if (data.allow_sideband_all)
1855 strbuf_addstr(value, " sideband-all");
1856
1857 if (data.allow_packfile_uris)
1858 strbuf_addstr(value, " packfile-uris");
1859 }
1860
1861 upload_pack_data_clear(&data);
1862
1863 return 1;
1864 }
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