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Merge branch 'jk/repack-leakfix'
[git.git] / upload-pack.c
blob94751477ab2d1e1ee28c291d3b1aaaa75e5fe3d4
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 "tag.h"
13 #include "object.h"
14 #include "commit.h"
15 #include "diff.h"
16 #include "revision.h"
17 #include "list-objects.h"
18 #include "list-objects-filter.h"
19 #include "list-objects-filter-options.h"
20 #include "run-command.h"
21 #include "connect.h"
22 #include "sigchain.h"
23 #include "version.h"
24 #include "string-list.h"
25 #include "strvec.h"
26 #include "trace2.h"
27 #include "prio-queue.h"
28 #include "protocol.h"
29 #include "quote.h"
30 #include "upload-pack.h"
31 #include "serve.h"
32 #include "commit-graph.h"
33 #include "commit-reach.h"
34 #include "shallow.h"
35 #include "write-or-die.h"
36
37 /* Remember to update object flag allocation in object.h */
38 #define THEY_HAVE (1u << 11)
39 #define OUR_REF (1u << 12)
40 #define WANTED (1u << 13)
41 #define COMMON_KNOWN (1u << 14)
42
43 #define SHALLOW (1u << 16)
44 #define NOT_SHALLOW (1u << 17)
45 #define CLIENT_SHALLOW (1u << 18)
46 #define HIDDEN_REF (1u << 19)
47
48 #define ALL_FLAGS (THEY_HAVE | OUR_REF | WANTED | COMMON_KNOWN | SHALLOW | \
49 NOT_SHALLOW | CLIENT_SHALLOW | HIDDEN_REF)
50
51 /* Enum for allowed unadvertised object request (UOR) */
52 enum allow_uor {
53 /* Allow specifying sha1 if it is a ref tip. */
54 ALLOW_TIP_SHA1 = 0x01,
55 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
56 ALLOW_REACHABLE_SHA1 = 0x02,
57 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
58 ALLOW_ANY_SHA1 = 0x07
59 };
60
61 /*
62 * Please annotate, and if possible group together, fields used only
63 * for protocol v0 or only for protocol v2.
64 */
65 struct upload_pack_data {
66 struct string_list symref; /* v0 only */
67 struct object_array want_obj;
68 struct object_array have_obj;
69 struct oid_array haves; /* v2 only */
70 struct string_list wanted_refs; /* v2 only */
71 struct strvec hidden_refs;
72
73 struct object_array shallows;
74 struct string_list deepen_not;
75 struct object_array extra_edge_obj;
76 int depth;
77 timestamp_t deepen_since;
78 int deepen_rev_list;
79 int deepen_relative;
80 int keepalive;
81 int shallow_nr;
82 timestamp_t oldest_have;
83
84 unsigned int timeout; /* v0 only */
85 enum {
86 NO_MULTI_ACK = 0,
87 MULTI_ACK = 1,
88 MULTI_ACK_DETAILED = 2
89 } multi_ack; /* v0 only */
90
91 /* 0 for no sideband, otherwise DEFAULT_PACKET_MAX or LARGE_PACKET_MAX */
92 int use_sideband;
93
94 struct string_list uri_protocols;
95 enum allow_uor allow_uor;
96
97 struct list_objects_filter_options filter_options;
98 struct string_list allowed_filters;
99
100 struct packet_writer writer;
101
102 const char *pack_objects_hook;
103
104 unsigned stateless_rpc : 1; /* v0 only */
105 unsigned no_done : 1; /* v0 only */
106 unsigned daemon_mode : 1; /* v0 only */
107 unsigned filter_capability_requested : 1; /* v0 only */
108
109 unsigned use_thin_pack : 1;
110 unsigned use_ofs_delta : 1;
111 unsigned no_progress : 1;
112 unsigned use_include_tag : 1;
113 unsigned wait_for_done : 1;
114 unsigned allow_filter : 1;
115 unsigned allow_filter_fallback : 1;
116 unsigned long tree_filter_max_depth;
117
118 unsigned done : 1; /* v2 only */
119 unsigned allow_ref_in_want : 1; /* v2 only */
120 unsigned allow_sideband_all : 1; /* v2 only */
121 unsigned advertise_sid : 1;
122 unsigned sent_capabilities : 1;
123 };
124
125 static void upload_pack_data_init(struct upload_pack_data *data)
126 {
127 struct string_list symref = STRING_LIST_INIT_DUP;
128 struct string_list wanted_refs = STRING_LIST_INIT_DUP;
129 struct strvec hidden_refs = STRVEC_INIT;
130 struct object_array want_obj = OBJECT_ARRAY_INIT;
131 struct object_array have_obj = OBJECT_ARRAY_INIT;
132 struct oid_array haves = OID_ARRAY_INIT;
133 struct object_array shallows = OBJECT_ARRAY_INIT;
134 struct string_list deepen_not = STRING_LIST_INIT_DUP;
135 struct string_list uri_protocols = STRING_LIST_INIT_DUP;
136 struct object_array extra_edge_obj = OBJECT_ARRAY_INIT;
137 struct string_list allowed_filters = STRING_LIST_INIT_DUP;
138
139 memset(data, 0, sizeof(*data));
140 data->symref = symref;
141 data->wanted_refs = wanted_refs;
142 data->hidden_refs = hidden_refs;
143 data->want_obj = want_obj;
144 data->have_obj = have_obj;
145 data->haves = haves;
146 data->shallows = shallows;
147 data->deepen_not = deepen_not;
148 data->uri_protocols = uri_protocols;
149 data->extra_edge_obj = extra_edge_obj;
150 data->allowed_filters = allowed_filters;
151 data->allow_filter_fallback = 1;
152 data->tree_filter_max_depth = ULONG_MAX;
153 packet_writer_init(&data->writer, 1);
154 list_objects_filter_init(&data->filter_options);
155
156 data->keepalive = 5;
157 data->advertise_sid = 0;
158 }
159
160 static void upload_pack_data_clear(struct upload_pack_data *data)
161 {
162 string_list_clear(&data->symref, 1);
163 string_list_clear(&data->wanted_refs, 1);
164 strvec_clear(&data->hidden_refs);
165 object_array_clear(&data->want_obj);
166 object_array_clear(&data->have_obj);
167 oid_array_clear(&data->haves);
168 object_array_clear(&data->shallows);
169 string_list_clear(&data->deepen_not, 0);
170 object_array_clear(&data->extra_edge_obj);
171 list_objects_filter_release(&data->filter_options);
172 string_list_clear(&data->allowed_filters, 0);
173
174 free((char *)data->pack_objects_hook);
175 }
176
177 static void reset_timeout(unsigned int timeout)
178 {
179 alarm(timeout);
180 }
181
182 static void send_client_data(int fd, const char *data, ssize_t sz,
183 int use_sideband)
184 {
185 if (use_sideband) {
186 send_sideband(1, fd, data, sz, use_sideband);
187 return;
188 }
189 if (fd == 3)
190 /* emergency quit */
191 fd = 2;
192 if (fd == 2) {
193 /* XXX: are we happy to lose stuff here? */
194 xwrite(fd, data, sz);
195 return;
196 }
197 write_or_die(fd, data, sz);
198 }
199
200 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
201 {
202 FILE *fp = cb_data;
203 if (graft->nr_parent == -1)
204 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
205 return 0;
206 }
207
208 struct output_state {
209 /*
210 * We do writes no bigger than LARGE_PACKET_DATA_MAX - 1, because with
211 * sideband-64k the band designator takes up 1 byte of space. Because
212 * relay_pack_data keeps the last byte to itself, we make the buffer 1
213 * byte bigger than the intended maximum write size.
214 */
215 char buffer[(LARGE_PACKET_DATA_MAX - 1) + 1];
216 int used;
217 unsigned packfile_uris_started : 1;
218 unsigned packfile_started : 1;
219 };
220
221 static int relay_pack_data(int pack_objects_out, struct output_state *os,
222 int use_sideband, int write_packfile_line)
223 {
224 /*
225 * We keep the last byte to ourselves
226 * in case we detect broken rev-list, so that we
227 * can leave the stream corrupted. This is
228 * unfortunate -- unpack-objects would happily
229 * accept a valid packdata with trailing garbage,
230 * so appending garbage after we pass all the
231 * pack data is not good enough to signal
232 * breakage to downstream.
233 */
234 ssize_t readsz;
235
236 readsz = xread(pack_objects_out, os->buffer + os->used,
237 sizeof(os->buffer) - os->used);
238 if (readsz < 0) {
239 return readsz;
240 }
241 os->used += readsz;
242
243 while (!os->packfile_started) {
244 char *p;
245 if (os->used >= 4 && !memcmp(os->buffer, "PACK", 4)) {
246 os->packfile_started = 1;
247 if (write_packfile_line) {
248 if (os->packfile_uris_started)
249 packet_delim(1);
250 packet_write_fmt(1, "\1packfile\n");
251 }
252 break;
253 }
254 if ((p = memchr(os->buffer, '\n', os->used))) {
255 if (!os->packfile_uris_started) {
256 os->packfile_uris_started = 1;
257 if (!write_packfile_line)
258 BUG("packfile_uris requires sideband-all");
259 packet_write_fmt(1, "\1packfile-uris\n");
260 }
261 *p = '\0';
262 packet_write_fmt(1, "\1%s\n", os->buffer);
263
264 os->used -= p - os->buffer + 1;
265 memmove(os->buffer, p + 1, os->used);
266 } else {
267 /*
268 * Incomplete line.
269 */
270 return readsz;
271 }
272 }
273
274 if (os->used > 1) {
275 send_client_data(1, os->buffer, os->used - 1, use_sideband);
276 os->buffer[0] = os->buffer[os->used - 1];
277 os->used = 1;
278 } else {
279 send_client_data(1, os->buffer, os->used, use_sideband);
280 os->used = 0;
281 }
282
283 return readsz;
284 }
285
286 static void create_pack_file(struct upload_pack_data *pack_data,
287 const struct string_list *uri_protocols)
288 {
289 struct child_process pack_objects = CHILD_PROCESS_INIT;
290 struct output_state *output_state = xcalloc(1, sizeof(struct output_state));
291 char progress[128];
292 char abort_msg[] = "aborting due to possible repository "
293 "corruption on the remote side.";
294 ssize_t sz;
295 int i;
296 FILE *pipe_fd;
297
298 if (!pack_data->pack_objects_hook)
299 pack_objects.git_cmd = 1;
300 else {
301 strvec_push(&pack_objects.args, pack_data->pack_objects_hook);
302 strvec_push(&pack_objects.args, "git");
303 pack_objects.use_shell = 1;
304 }
305
306 if (pack_data->shallow_nr) {
307 strvec_push(&pack_objects.args, "--shallow-file");
308 strvec_push(&pack_objects.args, "");
309 }
310 strvec_push(&pack_objects.args, "pack-objects");
311 strvec_push(&pack_objects.args, "--revs");
312 if (pack_data->use_thin_pack)
313 strvec_push(&pack_objects.args, "--thin");
314
315 strvec_push(&pack_objects.args, "--stdout");
316 if (pack_data->shallow_nr)
317 strvec_push(&pack_objects.args, "--shallow");
318 if (!pack_data->no_progress)
319 strvec_push(&pack_objects.args, "--progress");
320 if (pack_data->use_ofs_delta)
321 strvec_push(&pack_objects.args, "--delta-base-offset");
322 if (pack_data->use_include_tag)
323 strvec_push(&pack_objects.args, "--include-tag");
324 if (pack_data->filter_options.choice) {
325 const char *spec =
326 expand_list_objects_filter_spec(&pack_data->filter_options);
327 strvec_pushf(&pack_objects.args, "--filter=%s", spec);
328 }
329 if (uri_protocols) {
330 for (i = 0; i < uri_protocols->nr; i++)
331 strvec_pushf(&pack_objects.args, "--uri-protocol=%s",
332 uri_protocols->items[i].string);
333 }
334
335 pack_objects.in = -1;
336 pack_objects.out = -1;
337 pack_objects.err = -1;
338 pack_objects.clean_on_exit = 1;
339
340 if (start_command(&pack_objects))
341 die("git upload-pack: unable to fork git-pack-objects");
342
343 pipe_fd = xfdopen(pack_objects.in, "w");
344
345 if (pack_data->shallow_nr)
346 for_each_commit_graft(write_one_shallow, pipe_fd);
347
348 for (i = 0; i < pack_data->want_obj.nr; i++)
349 fprintf(pipe_fd, "%s\n",
350 oid_to_hex(&pack_data->want_obj.objects[i].item->oid));
351 fprintf(pipe_fd, "--not\n");
352 for (i = 0; i < pack_data->have_obj.nr; i++)
353 fprintf(pipe_fd, "%s\n",
354 oid_to_hex(&pack_data->have_obj.objects[i].item->oid));
355 for (i = 0; i < pack_data->extra_edge_obj.nr; i++)
356 fprintf(pipe_fd, "%s\n",
357 oid_to_hex(&pack_data->extra_edge_obj.objects[i].item->oid));
358 fprintf(pipe_fd, "\n");
359 fflush(pipe_fd);
360 fclose(pipe_fd);
361
362 /* We read from pack_objects.err to capture stderr output for
363 * progress bar, and pack_objects.out to capture the pack data.
364 */
365
366 while (1) {
367 struct pollfd pfd[2];
368 int pe, pu, pollsize, polltimeout;
369 int ret;
370
371 reset_timeout(pack_data->timeout);
372
373 pollsize = 0;
374 pe = pu = -1;
375
376 if (0 <= pack_objects.out) {
377 pfd[pollsize].fd = pack_objects.out;
378 pfd[pollsize].events = POLLIN;
379 pu = pollsize;
380 pollsize++;
381 }
382 if (0 <= pack_objects.err) {
383 pfd[pollsize].fd = pack_objects.err;
384 pfd[pollsize].events = POLLIN;
385 pe = pollsize;
386 pollsize++;
387 }
388
389 if (!pollsize)
390 break;
391
392 polltimeout = pack_data->keepalive < 0
393 ? -1
394 : 1000 * pack_data->keepalive;
395
396 ret = poll(pfd, pollsize, polltimeout);
397
398 if (ret < 0) {
399 if (errno != EINTR) {
400 error_errno("poll failed, resuming");
401 sleep(1);
402 }
403 continue;
404 }
405 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
406 /* Status ready; we ship that in the side-band
407 * or dump to the standard error.
408 */
409 sz = xread(pack_objects.err, progress,
410 sizeof(progress));
411 if (0 < sz)
412 send_client_data(2, progress, sz,
413 pack_data->use_sideband);
414 else if (sz == 0) {
415 close(pack_objects.err);
416 pack_objects.err = -1;
417 }
418 else
419 goto fail;
420 /* give priority to status messages */
421 continue;
422 }
423 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
424 int result = relay_pack_data(pack_objects.out,
425 output_state,
426 pack_data->use_sideband,
427 !!uri_protocols);
428
429 if (result == 0) {
430 close(pack_objects.out);
431 pack_objects.out = -1;
432 } else if (result < 0) {
433 goto fail;
434 }
435 }
436
437 /*
438 * We hit the keepalive timeout without saying anything; send
439 * an empty message on the data sideband just to let the other
440 * side know we're still working on it, but don't have any data
441 * yet.
442 *
443 * If we don't have a sideband channel, there's no room in the
444 * protocol to say anything, so those clients are just out of
445 * luck.
446 */
447 if (!ret && pack_data->use_sideband) {
448 static const char buf[] = "0005\1";
449 write_or_die(1, buf, 5);
450 }
451 }
452
453 if (finish_command(&pack_objects)) {
454 error("git upload-pack: git-pack-objects died with error.");
455 goto fail;
456 }
457
458 /* flush the data */
459 if (output_state->used > 0) {
460 send_client_data(1, output_state->buffer, output_state->used,
461 pack_data->use_sideband);
462 fprintf(stderr, "flushed.\n");
463 }
464 free(output_state);
465 if (pack_data->use_sideband)
466 packet_flush(1);
467 return;
468
469 fail:
470 free(output_state);
471 send_client_data(3, abort_msg, sizeof(abort_msg),
472 pack_data->use_sideband);
473 die("git upload-pack: %s", abort_msg);
474 }
475
476 static int do_got_oid(struct upload_pack_data *data, const struct object_id *oid)
477 {
478 int we_knew_they_have = 0;
479 struct object *o = parse_object(the_repository, oid);
480
481 if (!o)
482 die("oops (%s)", oid_to_hex(oid));
483 if (o->type == OBJ_COMMIT) {
484 struct commit_list *parents;
485 struct commit *commit = (struct commit *)o;
486 if (o->flags & THEY_HAVE)
487 we_knew_they_have = 1;
488 else
489 o->flags |= THEY_HAVE;
490 if (!data->oldest_have || (commit->date < data->oldest_have))
491 data->oldest_have = commit->date;
492 for (parents = commit->parents;
493 parents;
494 parents = parents->next)
495 parents->item->object.flags |= THEY_HAVE;
496 }
497 if (!we_knew_they_have) {
498 add_object_array(o, NULL, &data->have_obj);
499 return 1;
500 }
501 return 0;
502 }
503
504 static int got_oid(struct upload_pack_data *data,
505 const char *hex, struct object_id *oid)
506 {
507 if (get_oid_hex(hex, oid))
508 die("git upload-pack: expected SHA1 object, got '%s'", hex);
509 if (!repo_has_object_file_with_flags(the_repository, oid,
510 OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
511 return -1;
512 return do_got_oid(data, oid);
513 }
514
515 static int ok_to_give_up(struct upload_pack_data *data)
516 {
517 timestamp_t min_generation = GENERATION_NUMBER_ZERO;
518
519 if (!data->have_obj.nr)
520 return 0;
521
522 return can_all_from_reach_with_flag(&data->want_obj, THEY_HAVE,
523 COMMON_KNOWN, data->oldest_have,
524 min_generation);
525 }
526
527 static int get_common_commits(struct upload_pack_data *data,
528 struct packet_reader *reader)
529 {
530 struct object_id oid;
531 char last_hex[GIT_MAX_HEXSZ + 1];
532 int got_common = 0;
533 int got_other = 0;
534 int sent_ready = 0;
535
536 save_commit_buffer = 0;
537
538 for (;;) {
539 const char *arg;
540
541 reset_timeout(data->timeout);
542
543 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
544 if (data->multi_ack == MULTI_ACK_DETAILED
545 && got_common
546 && !got_other
547 && ok_to_give_up(data)) {
548 sent_ready = 1;
549 packet_write_fmt(1, "ACK %s ready\n", last_hex);
550 }
551 if (data->have_obj.nr == 0 || data->multi_ack)
552 packet_write_fmt(1, "NAK\n");
553
554 if (data->no_done && sent_ready) {
555 packet_write_fmt(1, "ACK %s\n", last_hex);
556 return 0;
557 }
558 if (data->stateless_rpc)
559 exit(0);
560 got_common = 0;
561 got_other = 0;
562 continue;
563 }
564 if (skip_prefix(reader->line, "have ", &arg)) {
565 switch (got_oid(data, arg, &oid)) {
566 case -1: /* they have what we do not */
567 got_other = 1;
568 if (data->multi_ack
569 && ok_to_give_up(data)) {
570 const char *hex = oid_to_hex(&oid);
571 if (data->multi_ack == MULTI_ACK_DETAILED) {
572 sent_ready = 1;
573 packet_write_fmt(1, "ACK %s ready\n", hex);
574 } else
575 packet_write_fmt(1, "ACK %s continue\n", hex);
576 }
577 break;
578 default:
579 got_common = 1;
580 oid_to_hex_r(last_hex, &oid);
581 if (data->multi_ack == MULTI_ACK_DETAILED)
582 packet_write_fmt(1, "ACK %s common\n", last_hex);
583 else if (data->multi_ack)
584 packet_write_fmt(1, "ACK %s continue\n", last_hex);
585 else if (data->have_obj.nr == 1)
586 packet_write_fmt(1, "ACK %s\n", last_hex);
587 break;
588 }
589 continue;
590 }
591 if (!strcmp(reader->line, "done")) {
592 if (data->have_obj.nr > 0) {
593 if (data->multi_ack)
594 packet_write_fmt(1, "ACK %s\n", last_hex);
595 return 0;
596 }
597 packet_write_fmt(1, "NAK\n");
598 return -1;
599 }
600 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
601 }
602 }
603
604 static int allow_hidden_refs(enum allow_uor allow_uor)
605 {
606 if ((allow_uor & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1)
607 return 1;
608 return !(allow_uor & (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
609 }
610
611 static void for_each_namespaced_ref_1(each_ref_fn fn,
612 struct upload_pack_data *data)
613 {
614 const char **excludes = NULL;
615 /*
616 * If `data->allow_uor` allows fetching hidden refs, we need to
617 * mark all references (including hidden ones), to check in
618 * `is_our_ref()` below.
619 *
620 * Otherwise, we only care about whether each reference's object
621 * has the OUR_REF bit set or not, so do not need to visit
622 * hidden references.
623 */
624 if (allow_hidden_refs(data->allow_uor))
625 excludes = hidden_refs_to_excludes(&data->hidden_refs);
626
627 for_each_namespaced_ref(excludes, fn, data);
628 }
629
630
631 static int is_our_ref(struct object *o, enum allow_uor allow_uor)
632 {
633 return o->flags & ((allow_hidden_refs(allow_uor) ? 0 : HIDDEN_REF) | OUR_REF);
634 }
635
636 /*
637 * on successful case, it's up to the caller to close cmd->out
638 */
639 static int do_reachable_revlist(struct child_process *cmd,
640 struct object_array *src,
641 struct object_array *reachable,
642 enum allow_uor allow_uor)
643 {
644 struct object *o;
645 FILE *cmd_in = NULL;
646 int i;
647
648 strvec_pushl(&cmd->args, "rev-list", "--stdin", NULL);
649 cmd->git_cmd = 1;
650 cmd->no_stderr = 1;
651 cmd->in = -1;
652 cmd->out = -1;
653
654 /*
655 * If the next rev-list --stdin encounters an unknown commit,
656 * it terminates, which will cause SIGPIPE in the write loop
657 * below.
658 */
659 sigchain_push(SIGPIPE, SIG_IGN);
660
661 if (start_command(cmd))
662 goto error;
663
664 cmd_in = xfdopen(cmd->in, "w");
665
666 for (i = get_max_object_index(); 0 < i; ) {
667 o = get_indexed_object(--i);
668 if (!o)
669 continue;
670 if (reachable && o->type == OBJ_COMMIT)
671 o->flags &= ~TMP_MARK;
672 if (!is_our_ref(o, allow_uor))
673 continue;
674 if (fprintf(cmd_in, "^%s\n", oid_to_hex(&o->oid)) < 0)
675 goto error;
676 }
677 for (i = 0; i < src->nr; i++) {
678 o = src->objects[i].item;
679 if (is_our_ref(o, allow_uor)) {
680 if (reachable)
681 add_object_array(o, NULL, reachable);
682 continue;
683 }
684 if (reachable && o->type == OBJ_COMMIT)
685 o->flags |= TMP_MARK;
686 if (fprintf(cmd_in, "%s\n", oid_to_hex(&o->oid)) < 0)
687 goto error;
688 }
689 if (ferror(cmd_in) || fflush(cmd_in))
690 goto error;
691 fclose(cmd_in);
692 cmd->in = -1;
693 sigchain_pop(SIGPIPE);
694
695 return 0;
696
697 error:
698 sigchain_pop(SIGPIPE);
699
700 if (cmd_in)
701 fclose(cmd_in);
702 if (cmd->out >= 0)
703 close(cmd->out);
704 return -1;
705 }
706
707 static int get_reachable_list(struct upload_pack_data *data,
708 struct object_array *reachable)
709 {
710 struct child_process cmd = CHILD_PROCESS_INIT;
711 int i;
712 struct object *o;
713 char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
714 const unsigned hexsz = the_hash_algo->hexsz;
715
716 if (do_reachable_revlist(&cmd, &data->shallows, reachable,
717 data->allow_uor) < 0)
718 return -1;
719
720 while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
721 struct object_id oid;
722 const char *p;
723
724 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
725 break;
726
727 o = lookup_object(the_repository, &oid);
728 if (o && o->type == OBJ_COMMIT) {
729 o->flags &= ~TMP_MARK;
730 }
731 }
732 for (i = get_max_object_index(); 0 < i; i--) {
733 o = get_indexed_object(i - 1);
734 if (o && o->type == OBJ_COMMIT &&
735 (o->flags & TMP_MARK)) {
736 add_object_array(o, NULL, reachable);
737 o->flags &= ~TMP_MARK;
738 }
739 }
740 close(cmd.out);
741
742 if (finish_command(&cmd))
743 return -1;
744
745 return 0;
746 }
747
748 static int has_unreachable(struct object_array *src, enum allow_uor allow_uor)
749 {
750 struct child_process cmd = CHILD_PROCESS_INIT;
751 char buf[1];
752 int i;
753
754 if (do_reachable_revlist(&cmd, src, NULL, allow_uor) < 0)
755 return 1;
756
757 /*
758 * The commits out of the rev-list are not ancestors of
759 * our ref.
760 */
761 i = read_in_full(cmd.out, buf, 1);
762 if (i)
763 goto error;
764 close(cmd.out);
765 cmd.out = -1;
766
767 /*
768 * rev-list may have died by encountering a bad commit
769 * in the history, in which case we do want to bail out
770 * even when it showed no commit.
771 */
772 if (finish_command(&cmd))
773 goto error;
774
775 /* All the non-tip ones are ancestors of what we advertised */
776 return 0;
777
778 error:
779 if (cmd.out >= 0)
780 close(cmd.out);
781 return 1;
782 }
783
784 static void check_non_tip(struct upload_pack_data *data)
785 {
786 int i;
787
788 /*
789 * In the normal in-process case without
790 * uploadpack.allowReachableSHA1InWant,
791 * non-tip requests can never happen.
792 */
793 if (!data->stateless_rpc && !(data->allow_uor & ALLOW_REACHABLE_SHA1))
794 goto error;
795 if (!has_unreachable(&data->want_obj, data->allow_uor))
796 /* All the non-tip ones are ancestors of what we advertised */
797 return;
798
799 error:
800 /* Pick one of them (we know there at least is one) */
801 for (i = 0; i < data->want_obj.nr; i++) {
802 struct object *o = data->want_obj.objects[i].item;
803 if (!is_our_ref(o, data->allow_uor)) {
804 packet_writer_error(&data->writer,
805 "upload-pack: not our ref %s",
806 oid_to_hex(&o->oid));
807 die("git upload-pack: not our ref %s",
808 oid_to_hex(&o->oid));
809 }
810 }
811 }
812
813 static void send_shallow(struct upload_pack_data *data,
814 struct commit_list *result)
815 {
816 while (result) {
817 struct object *object = &result->item->object;
818 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
819 packet_writer_write(&data->writer, "shallow %s",
820 oid_to_hex(&object->oid));
821 register_shallow(the_repository, &object->oid);
822 data->shallow_nr++;
823 }
824 result = result->next;
825 }
826 }
827
828 static void send_unshallow(struct upload_pack_data *data)
829 {
830 int i;
831
832 for (i = 0; i < data->shallows.nr; i++) {
833 struct object *object = data->shallows.objects[i].item;
834 if (object->flags & NOT_SHALLOW) {
835 struct commit_list *parents;
836 packet_writer_write(&data->writer, "unshallow %s",
837 oid_to_hex(&object->oid));
838 object->flags &= ~CLIENT_SHALLOW;
839 /*
840 * We want to _register_ "object" as shallow, but we
841 * also need to traverse object's parents to deepen a
842 * shallow clone. Unregister it for now so we can
843 * parse and add the parents to the want list, then
844 * re-register it.
845 */
846 unregister_shallow(&object->oid);
847 object->parsed = 0;
848 parse_commit_or_die((struct commit *)object);
849 parents = ((struct commit *)object)->parents;
850 while (parents) {
851 add_object_array(&parents->item->object,
852 NULL, &data->want_obj);
853 parents = parents->next;
854 }
855 add_object_array(object, NULL, &data->extra_edge_obj);
856 }
857 /* make sure commit traversal conforms to client */
858 register_shallow(the_repository, &object->oid);
859 }
860 }
861
862 static int check_ref(const char *refname_full, const struct object_id *oid,
863 int flag, void *cb_data);
864 static void deepen(struct upload_pack_data *data, int depth)
865 {
866 if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
867 int i;
868
869 for (i = 0; i < data->shallows.nr; i++) {
870 struct object *object = data->shallows.objects[i].item;
871 object->flags |= NOT_SHALLOW;
872 }
873 } else if (data->deepen_relative) {
874 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
875 struct commit_list *result;
876
877 /*
878 * Checking for reachable shallows requires that our refs be
879 * marked with OUR_REF.
880 */
881 head_ref_namespaced(check_ref, data);
882 for_each_namespaced_ref_1(check_ref, data);
883
884 get_reachable_list(data, &reachable_shallows);
885 result = get_shallow_commits(&reachable_shallows,
886 depth + 1,
887 SHALLOW, NOT_SHALLOW);
888 send_shallow(data, result);
889 free_commit_list(result);
890 object_array_clear(&reachable_shallows);
891 } else {
892 struct commit_list *result;
893
894 result = get_shallow_commits(&data->want_obj, depth,
895 SHALLOW, NOT_SHALLOW);
896 send_shallow(data, result);
897 free_commit_list(result);
898 }
899
900 send_unshallow(data);
901 }
902
903 static void deepen_by_rev_list(struct upload_pack_data *data,
904 int ac,
905 const char **av)
906 {
907 struct commit_list *result;
908
909 disable_commit_graph(the_repository);
910 result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
911 send_shallow(data, result);
912 free_commit_list(result);
913 send_unshallow(data);
914 }
915
916 /* Returns 1 if a shallow list is sent or 0 otherwise */
917 static int send_shallow_list(struct upload_pack_data *data)
918 {
919 int ret = 0;
920
921 if (data->depth > 0 && data->deepen_rev_list)
922 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
923 if (data->depth > 0) {
924 deepen(data, data->depth);
925 ret = 1;
926 } else if (data->deepen_rev_list) {
927 struct strvec av = STRVEC_INIT;
928 int i;
929
930 strvec_push(&av, "rev-list");
931 if (data->deepen_since)
932 strvec_pushf(&av, "--max-age=%"PRItime, data->deepen_since);
933 if (data->deepen_not.nr) {
934 strvec_push(&av, "--not");
935 for (i = 0; i < data->deepen_not.nr; i++) {
936 struct string_list_item *s = data->deepen_not.items + i;
937 strvec_push(&av, s->string);
938 }
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 string_list *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 string_list_append(deepen_not, ref);
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(the_repository, &oid_buf);
1159 if (!o) {
1160 packet_writer_error(&data->writer,
1161 "upload-pack: not our ref %s",
1162 oid_to_hex(&oid_buf));
1163 die("git upload-pack: not our ref %s",
1164 oid_to_hex(&oid_buf));
1165 }
1166 if (!(o->flags & WANTED)) {
1167 o->flags |= WANTED;
1168 if (!((data->allow_uor & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
1169 || is_our_ref(o, data->allow_uor)))
1170 has_non_tip = 1;
1171 add_object_array(o, NULL, &data->want_obj);
1172 }
1173 }
1174
1175 /*
1176 * We have sent all our refs already, and the other end
1177 * should have chosen out of them. When we are operating
1178 * in the stateless RPC mode, however, their choice may
1179 * have been based on the set of older refs advertised
1180 * by another process that handled the initial request.
1181 */
1182 if (has_non_tip)
1183 check_non_tip(data);
1184
1185 if (!data->use_sideband && data->daemon_mode)
1186 data->no_progress = 1;
1187
1188 if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1189 return;
1190
1191 if (send_shallow_list(data))
1192 packet_flush(1);
1193 }
1194
1195 /* return non-zero if the ref is hidden, otherwise 0 */
1196 static int mark_our_ref(const char *refname, const char *refname_full,
1197 const struct object_id *oid, const struct strvec *hidden_refs)
1198 {
1199 struct object *o = lookup_unknown_object(the_repository, oid);
1200
1201 if (ref_is_hidden(refname, refname_full, hidden_refs)) {
1202 o->flags |= HIDDEN_REF;
1203 return 1;
1204 }
1205 o->flags |= OUR_REF;
1206 return 0;
1207 }
1208
1209 static int check_ref(const char *refname_full, const struct object_id *oid,
1210 int flag UNUSED, void *cb_data)
1211 {
1212 const char *refname = strip_namespace(refname_full);
1213 struct upload_pack_data *data = cb_data;
1214
1215 mark_our_ref(refname, refname_full, oid, &data->hidden_refs);
1216 return 0;
1217 }
1218
1219 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1220 {
1221 struct string_list_item *item;
1222
1223 if (!symref->nr)
1224 return;
1225 for_each_string_list_item(item, symref)
1226 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1227 }
1228
1229 static void format_session_id(struct strbuf *buf, struct upload_pack_data *d) {
1230 if (d->advertise_sid)
1231 strbuf_addf(buf, " session-id=%s", trace2_session_id());
1232 }
1233
1234 static void write_v0_ref(struct upload_pack_data *data,
1235 const char *refname, const char *refname_nons,
1236 const struct object_id *oid)
1237 {
1238 static const char *capabilities = "multi_ack thin-pack side-band"
1239 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1240 " deepen-relative no-progress include-tag multi_ack_detailed";
1241 struct object_id peeled;
1242
1243 if (mark_our_ref(refname_nons, refname, oid, &data->hidden_refs))
1244 return;
1245
1246 if (capabilities) {
1247 struct strbuf symref_info = STRBUF_INIT;
1248 struct strbuf session_id = STRBUF_INIT;
1249
1250 format_symref_info(&symref_info, &data->symref);
1251 format_session_id(&session_id, data);
1252 packet_fwrite_fmt(stdout, "%s %s%c%s%s%s%s%s%s%s object-format=%s agent=%s\n",
1253 oid_to_hex(oid), refname_nons,
1254 0, capabilities,
1255 (data->allow_uor & ALLOW_TIP_SHA1) ?
1256 " allow-tip-sha1-in-want" : "",
1257 (data->allow_uor & ALLOW_REACHABLE_SHA1) ?
1258 " allow-reachable-sha1-in-want" : "",
1259 data->no_done ? " no-done" : "",
1260 symref_info.buf,
1261 data->allow_filter ? " filter" : "",
1262 session_id.buf,
1263 the_hash_algo->name,
1264 git_user_agent_sanitized());
1265 strbuf_release(&symref_info);
1266 strbuf_release(&session_id);
1267 data->sent_capabilities = 1;
1268 } else {
1269 packet_fwrite_fmt(stdout, "%s %s\n", oid_to_hex(oid), refname_nons);
1270 }
1271 capabilities = NULL;
1272 if (!peel_iterated_oid(oid, &peeled))
1273 packet_fwrite_fmt(stdout, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1274 return;
1275 }
1276
1277 static int send_ref(const char *refname, const struct object_id *oid,
1278 int flag UNUSED, void *cb_data)
1279 {
1280 write_v0_ref(cb_data, refname, strip_namespace(refname), oid);
1281 return 0;
1282 }
1283
1284 static int find_symref(const char *refname,
1285 const struct object_id *oid UNUSED,
1286 int flag, void *cb_data)
1287 {
1288 const char *symref_target;
1289 struct string_list_item *item;
1290
1291 if ((flag & REF_ISSYMREF) == 0)
1292 return 0;
1293 symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1294 if (!symref_target || (flag & REF_ISSYMREF) == 0)
1295 die("'%s' is a symref but it is not?", refname);
1296 item = string_list_append(cb_data, strip_namespace(refname));
1297 item->util = xstrdup(strip_namespace(symref_target));
1298 return 0;
1299 }
1300
1301 static int parse_object_filter_config(const char *var, const char *value,
1302 const struct key_value_info *kvi,
1303 struct upload_pack_data *data)
1304 {
1305 struct strbuf buf = STRBUF_INIT;
1306 const char *sub, *key;
1307 size_t sub_len;
1308
1309 if (parse_config_key(var, "uploadpackfilter", &sub, &sub_len, &key))
1310 return 0;
1311
1312 if (!sub) {
1313 if (!strcmp(key, "allow"))
1314 data->allow_filter_fallback = git_config_bool(var, value);
1315 return 0;
1316 }
1317
1318 strbuf_add(&buf, sub, sub_len);
1319
1320 if (!strcmp(key, "allow"))
1321 string_list_insert(&data->allowed_filters, buf.buf)->util =
1322 (void *)(intptr_t)git_config_bool(var, value);
1323 else if (!strcmp(buf.buf, "tree") && !strcmp(key, "maxdepth")) {
1324 if (!value) {
1325 strbuf_release(&buf);
1326 return config_error_nonbool(var);
1327 }
1328 string_list_insert(&data->allowed_filters, buf.buf)->util =
1329 (void *)(intptr_t)1;
1330 data->tree_filter_max_depth = git_config_ulong(var, value,
1331 kvi);
1332 }
1333
1334 strbuf_release(&buf);
1335 return 0;
1336 }
1337
1338 static int upload_pack_config(const char *var, const char *value,
1339 const struct config_context *ctx,
1340 void *cb_data)
1341 {
1342 struct upload_pack_data *data = cb_data;
1343
1344 if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1345 if (git_config_bool(var, value))
1346 data->allow_uor |= ALLOW_TIP_SHA1;
1347 else
1348 data->allow_uor &= ~ALLOW_TIP_SHA1;
1349 } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1350 if (git_config_bool(var, value))
1351 data->allow_uor |= ALLOW_REACHABLE_SHA1;
1352 else
1353 data->allow_uor &= ~ALLOW_REACHABLE_SHA1;
1354 } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1355 if (git_config_bool(var, value))
1356 data->allow_uor |= ALLOW_ANY_SHA1;
1357 else
1358 data->allow_uor &= ~ALLOW_ANY_SHA1;
1359 } else if (!strcmp("uploadpack.keepalive", var)) {
1360 data->keepalive = git_config_int(var, value, ctx->kvi);
1361 if (!data->keepalive)
1362 data->keepalive = -1;
1363 } else if (!strcmp("uploadpack.allowfilter", var)) {
1364 data->allow_filter = git_config_bool(var, value);
1365 } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1366 data->allow_ref_in_want = git_config_bool(var, value);
1367 } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1368 data->allow_sideband_all = git_config_bool(var, value);
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 upload_pack_data *data)
1393 {
1394 git_config(upload_pack_config, data);
1395 git_protected_config(upload_pack_protected_config, data);
1396 }
1397
1398 void upload_pack(const int advertise_refs, const int stateless_rpc,
1399 const int timeout)
1400 {
1401 struct packet_reader reader;
1402 struct upload_pack_data data;
1403
1404 upload_pack_data_init(&data);
1405 get_upload_pack_config(&data);
1406
1407 data.stateless_rpc = stateless_rpc;
1408 data.timeout = timeout;
1409 if (data.timeout)
1410 data.daemon_mode = 1;
1411
1412 head_ref_namespaced(find_symref, &data.symref);
1413
1414 if (advertise_refs || !data.stateless_rpc) {
1415 reset_timeout(data.timeout);
1416 if (advertise_refs)
1417 data.no_done = 1;
1418 head_ref_namespaced(send_ref, &data);
1419 for_each_namespaced_ref_1(send_ref, &data);
1420 if (!data.sent_capabilities) {
1421 const char *refname = "capabilities^{}";
1422 write_v0_ref(&data, refname, refname, null_oid());
1423 }
1424 /*
1425 * fflush stdout before calling advertise_shallow_grafts because send_ref
1426 * uses stdio.
1427 */
1428 fflush_or_die(stdout);
1429 advertise_shallow_grafts(1);
1430 packet_flush(1);
1431 } else {
1432 head_ref_namespaced(check_ref, &data);
1433 for_each_namespaced_ref_1(check_ref, &data);
1434 }
1435
1436 if (!advertise_refs) {
1437 packet_reader_init(&reader, 0, NULL, 0,
1438 PACKET_READ_CHOMP_NEWLINE |
1439 PACKET_READ_DIE_ON_ERR_PACKET);
1440
1441 receive_needs(&data, &reader);
1442
1443 /*
1444 * An EOF at this exact point in negotiation should be
1445 * acceptable from stateless clients as they will consume the
1446 * shallow list before doing subsequent rpc with haves/etc.
1447 */
1448 if (data.stateless_rpc)
1449 reader.options |= PACKET_READ_GENTLE_ON_EOF;
1450
1451 if (data.want_obj.nr &&
1452 packet_reader_peek(&reader) != PACKET_READ_EOF) {
1453 reader.options &= ~PACKET_READ_GENTLE_ON_EOF;
1454 get_common_commits(&data, &reader);
1455 create_pack_file(&data, NULL);
1456 }
1457 }
1458
1459 upload_pack_data_clear(&data);
1460 }
1461
1462 static int parse_want(struct packet_writer *writer, const char *line,
1463 struct object_array *want_obj)
1464 {
1465 const char *arg;
1466 if (skip_prefix(line, "want ", &arg)) {
1467 struct object_id oid;
1468 struct object *o;
1469
1470 if (get_oid_hex(arg, &oid))
1471 die("git upload-pack: protocol error, "
1472 "expected to get oid, not '%s'", line);
1473
1474 o = parse_object_with_flags(the_repository, &oid,
1475 PARSE_OBJECT_SKIP_HASH_CHECK);
1476
1477 if (!o) {
1478 packet_writer_error(writer,
1479 "upload-pack: not our ref %s",
1480 oid_to_hex(&oid));
1481 die("git upload-pack: not our ref %s",
1482 oid_to_hex(&oid));
1483 }
1484
1485 if (!(o->flags & WANTED)) {
1486 o->flags |= WANTED;
1487 add_object_array(o, NULL, want_obj);
1488 }
1489
1490 return 1;
1491 }
1492
1493 return 0;
1494 }
1495
1496 static int parse_want_ref(struct packet_writer *writer, const char *line,
1497 struct string_list *wanted_refs,
1498 struct strvec *hidden_refs,
1499 struct object_array *want_obj)
1500 {
1501 const char *refname_nons;
1502 if (skip_prefix(line, "want-ref ", &refname_nons)) {
1503 struct object_id oid;
1504 struct string_list_item *item;
1505 struct object *o = NULL;
1506 struct strbuf refname = STRBUF_INIT;
1507
1508 strbuf_addf(&refname, "%s%s", get_git_namespace(), refname_nons);
1509 if (ref_is_hidden(refname_nons, refname.buf, hidden_refs) ||
1510 read_ref(refname.buf, &oid)) {
1511 packet_writer_error(writer, "unknown ref %s", refname_nons);
1512 die("unknown ref %s", refname_nons);
1513 }
1514 strbuf_release(&refname);
1515
1516 item = string_list_append(wanted_refs, refname_nons);
1517 item->util = oiddup(&oid);
1518
1519 if (!starts_with(refname_nons, "refs/tags/")) {
1520 struct commit *commit = lookup_commit_in_graph(the_repository, &oid);
1521 if (commit)
1522 o = &commit->object;
1523 }
1524
1525 if (!o)
1526 o = parse_object_or_die(&oid, refname_nons);
1527
1528 if (!(o->flags & WANTED)) {
1529 o->flags |= WANTED;
1530 add_object_array(o, NULL, want_obj);
1531 }
1532
1533 return 1;
1534 }
1535
1536 return 0;
1537 }
1538
1539 static int parse_have(const char *line, struct oid_array *haves)
1540 {
1541 const char *arg;
1542 if (skip_prefix(line, "have ", &arg)) {
1543 struct object_id oid;
1544
1545 if (get_oid_hex(arg, &oid))
1546 die("git upload-pack: expected SHA1 object, got '%s'", arg);
1547 oid_array_append(haves, &oid);
1548 return 1;
1549 }
1550
1551 return 0;
1552 }
1553
1554 static void process_args(struct packet_reader *request,
1555 struct upload_pack_data *data)
1556 {
1557 while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1558 const char *arg = request->line;
1559 const char *p;
1560
1561 /* process want */
1562 if (parse_want(&data->writer, arg, &data->want_obj))
1563 continue;
1564 if (data->allow_ref_in_want &&
1565 parse_want_ref(&data->writer, arg, &data->wanted_refs,
1566 &data->hidden_refs, &data->want_obj))
1567 continue;
1568 /* process have line */
1569 if (parse_have(arg, &data->haves))
1570 continue;
1571
1572 /* process args like thin-pack */
1573 if (!strcmp(arg, "thin-pack")) {
1574 data->use_thin_pack = 1;
1575 continue;
1576 }
1577 if (!strcmp(arg, "ofs-delta")) {
1578 data->use_ofs_delta = 1;
1579 continue;
1580 }
1581 if (!strcmp(arg, "no-progress")) {
1582 data->no_progress = 1;
1583 continue;
1584 }
1585 if (!strcmp(arg, "include-tag")) {
1586 data->use_include_tag = 1;
1587 continue;
1588 }
1589 if (!strcmp(arg, "done")) {
1590 data->done = 1;
1591 continue;
1592 }
1593 if (!strcmp(arg, "wait-for-done")) {
1594 data->wait_for_done = 1;
1595 continue;
1596 }
1597
1598 /* Shallow related arguments */
1599 if (process_shallow(arg, &data->shallows))
1600 continue;
1601 if (process_deepen(arg, &data->depth))
1602 continue;
1603 if (process_deepen_since(arg, &data->deepen_since,
1604 &data->deepen_rev_list))
1605 continue;
1606 if (process_deepen_not(arg, &data->deepen_not,
1607 &data->deepen_rev_list))
1608 continue;
1609 if (!strcmp(arg, "deepen-relative")) {
1610 data->deepen_relative = 1;
1611 continue;
1612 }
1613
1614 if (data->allow_filter && skip_prefix(arg, "filter ", &p)) {
1615 list_objects_filter_die_if_populated(&data->filter_options);
1616 parse_list_objects_filter(&data->filter_options, p);
1617 die_if_using_banned_filter(data);
1618 continue;
1619 }
1620
1621 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1622 data->allow_sideband_all) &&
1623 !strcmp(arg, "sideband-all")) {
1624 data->writer.use_sideband = 1;
1625 continue;
1626 }
1627
1628 if (skip_prefix(arg, "packfile-uris ", &p)) {
1629 string_list_split(&data->uri_protocols, p, ',', -1);
1630 continue;
1631 }
1632
1633 /* ignore unknown lines maybe? */
1634 die("unexpected line: '%s'", arg);
1635 }
1636
1637 if (data->uri_protocols.nr && !data->writer.use_sideband)
1638 string_list_clear(&data->uri_protocols, 0);
1639
1640 if (request->status != PACKET_READ_FLUSH)
1641 die(_("expected flush after fetch arguments"));
1642 }
1643
1644 static int process_haves(struct upload_pack_data *data, struct oid_array *common)
1645 {
1646 int i;
1647
1648 /* Process haves */
1649 for (i = 0; i < data->haves.nr; i++) {
1650 const struct object_id *oid = &data->haves.oid[i];
1651
1652 if (!repo_has_object_file_with_flags(the_repository, oid,
1653 OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
1654 continue;
1655
1656 oid_array_append(common, oid);
1657
1658 do_got_oid(data, oid);
1659 }
1660
1661 return 0;
1662 }
1663
1664 static int send_acks(struct upload_pack_data *data, struct oid_array *acks)
1665 {
1666 int i;
1667
1668 packet_writer_write(&data->writer, "acknowledgments\n");
1669
1670 /* Send Acks */
1671 if (!acks->nr)
1672 packet_writer_write(&data->writer, "NAK\n");
1673
1674 for (i = 0; i < acks->nr; i++) {
1675 packet_writer_write(&data->writer, "ACK %s\n",
1676 oid_to_hex(&acks->oid[i]));
1677 }
1678
1679 if (!data->wait_for_done && ok_to_give_up(data)) {
1680 /* Send Ready */
1681 packet_writer_write(&data->writer, "ready\n");
1682 return 1;
1683 }
1684
1685 return 0;
1686 }
1687
1688 static int process_haves_and_send_acks(struct upload_pack_data *data)
1689 {
1690 struct oid_array common = OID_ARRAY_INIT;
1691 int ret = 0;
1692
1693 process_haves(data, &common);
1694 if (data->done) {
1695 ret = 1;
1696 } else if (send_acks(data, &common)) {
1697 packet_writer_delim(&data->writer);
1698 ret = 1;
1699 } else {
1700 /* Add Flush */
1701 packet_writer_flush(&data->writer);
1702 ret = 0;
1703 }
1704
1705 oid_array_clear(&data->haves);
1706 oid_array_clear(&common);
1707 return ret;
1708 }
1709
1710 static void send_wanted_ref_info(struct upload_pack_data *data)
1711 {
1712 const struct string_list_item *item;
1713
1714 if (!data->wanted_refs.nr)
1715 return;
1716
1717 packet_writer_write(&data->writer, "wanted-refs\n");
1718
1719 for_each_string_list_item(item, &data->wanted_refs) {
1720 packet_writer_write(&data->writer, "%s %s\n",
1721 oid_to_hex(item->util),
1722 item->string);
1723 }
1724
1725 packet_writer_delim(&data->writer);
1726 }
1727
1728 static void send_shallow_info(struct upload_pack_data *data)
1729 {
1730 /* No shallow info needs to be sent */
1731 if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1732 !is_repository_shallow(the_repository))
1733 return;
1734
1735 packet_writer_write(&data->writer, "shallow-info\n");
1736
1737 if (!send_shallow_list(data) &&
1738 is_repository_shallow(the_repository))
1739 deepen(data, INFINITE_DEPTH);
1740
1741 packet_delim(1);
1742 }
1743
1744 enum fetch_state {
1745 FETCH_PROCESS_ARGS = 0,
1746 FETCH_SEND_ACKS,
1747 FETCH_SEND_PACK,
1748 FETCH_DONE,
1749 };
1750
1751 int upload_pack_v2(struct repository *r UNUSED, struct packet_reader *request)
1752 {
1753 enum fetch_state state = FETCH_PROCESS_ARGS;
1754 struct upload_pack_data data;
1755
1756 clear_object_flags(ALL_FLAGS);
1757
1758 upload_pack_data_init(&data);
1759 data.use_sideband = LARGE_PACKET_MAX;
1760 get_upload_pack_config(&data);
1761
1762 while (state != FETCH_DONE) {
1763 switch (state) {
1764 case FETCH_PROCESS_ARGS:
1765 process_args(request, &data);
1766
1767 if (!data.want_obj.nr && !data.wait_for_done) {
1768 /*
1769 * Request didn't contain any 'want' lines (and
1770 * the request does not contain
1771 * "wait-for-done", in which it is reasonable
1772 * to just send 'have's without 'want's); guess
1773 * they didn't want anything.
1774 */
1775 state = FETCH_DONE;
1776 } else if (data.haves.nr) {
1777 /*
1778 * Request had 'have' lines, so lets ACK them.
1779 */
1780 state = FETCH_SEND_ACKS;
1781 } else {
1782 /*
1783 * Request had 'want's but no 'have's so we can
1784 * immedietly go to construct and send a pack.
1785 */
1786 state = FETCH_SEND_PACK;
1787 }
1788 break;
1789 case FETCH_SEND_ACKS:
1790 if (process_haves_and_send_acks(&data))
1791 state = FETCH_SEND_PACK;
1792 else
1793 state = FETCH_DONE;
1794 break;
1795 case FETCH_SEND_PACK:
1796 send_wanted_ref_info(&data);
1797 send_shallow_info(&data);
1798
1799 if (data.uri_protocols.nr) {
1800 create_pack_file(&data, &data.uri_protocols);
1801 } else {
1802 packet_writer_write(&data.writer, "packfile\n");
1803 create_pack_file(&data, NULL);
1804 }
1805 state = FETCH_DONE;
1806 break;
1807 case FETCH_DONE:
1808 continue;
1809 }
1810 }
1811
1812 upload_pack_data_clear(&data);
1813 return 0;
1814 }
1815
1816 int upload_pack_advertise(struct repository *r,
1817 struct strbuf *value)
1818 {
1819 if (value) {
1820 int allow_filter_value;
1821 int allow_ref_in_want;
1822 int allow_sideband_all_value;
1823 char *str = NULL;
1824
1825 strbuf_addstr(value, "shallow wait-for-done");
1826
1827 if (!repo_config_get_bool(r,
1828 "uploadpack.allowfilter",
1829 &allow_filter_value) &&
1830 allow_filter_value)
1831 strbuf_addstr(value, " filter");
1832
1833 if (!repo_config_get_bool(r,
1834 "uploadpack.allowrefinwant",
1835 &allow_ref_in_want) &&
1836 allow_ref_in_want)
1837 strbuf_addstr(value, " ref-in-want");
1838
1839 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1840 (!repo_config_get_bool(r,
1841 "uploadpack.allowsidebandall",
1842 &allow_sideband_all_value) &&
1843 allow_sideband_all_value))
1844 strbuf_addstr(value, " sideband-all");
1845
1846 if (!repo_config_get_string(r,
1847 "uploadpack.blobpackfileuri",
1848 &str) &&
1849 str) {
1850 strbuf_addstr(value, " packfile-uris");
1851 free(str);
1852 }
1853 }
1854
1855 return 1;
1856 }
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