1#include "cache.h"
2#include "config.h"
3#include "refs.h"
4#include "pkt-line.h"
5#include "sideband.h"
6#include "tag.h"
7#include "object.h"
8#include "commit.h"
9#include "diff.h"
10#include "revision.h"
11#include "list-objects.h"
12#include "run-command.h"
13#include "connect.h"
14#include "sigchain.h"
15#include "version.h"
16#include "string-list.h"
17#include "argv-array.h"
18#include "prio-queue.h"
19#include "protocol.h"
20#include "upload-pack.h"
21#include "serve.h"
22/* Remember to update object flag allocation in object.h */
24#define THEY_HAVE (1u << 11)
25#define OUR_REF (1u << 12)
26#define WANTED (1u << 13)
27#define COMMON_KNOWN (1u << 14)
28#define REACHABLE (1u << 15)
29#define SHALLOW (1u << 16)
31#define NOT_SHALLOW (1u << 17)
32#define CLIENT_SHALLOW (1u << 18)
33#define HIDDEN_REF (1u << 19)
34static timestamp_t oldest_have;
36static int deepen_relative;
38static int multi_ack;
39static int no_done;
40static int use_thin_pack, use_ofs_delta, use_include_tag;
41static int no_progress, daemon_mode;
42/* Allow specifying sha1 if it is a ref tip. */
43#define ALLOW_TIP_SHA1 01
44/* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
45#define ALLOW_REACHABLE_SHA1 02
46/* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
47#define ALLOW_ANY_SHA1 07
48static unsigned int allow_unadvertised_object_request;
49static int shallow_nr;
50static struct object_array have_obj;
51static struct object_array want_obj;
52static struct object_array extra_edge_obj;
53static unsigned int timeout;
54static int keepalive = 5;
55/* 0 for no sideband,
56 * otherwise maximum packet size (up to 65520 bytes).
57 */
58static int use_sideband;
59static int stateless_rpc;
60static const char *pack_objects_hook;
61static void reset_timeout(void)
63{
64 alarm(timeout);
65}
66static void send_client_data(int fd, const char *data, ssize_t sz)
68{
69 if (use_sideband) {
70 send_sideband(1, fd, data, sz, use_sideband);
71 return;
72 }
73 if (fd == 3)
74 /* emergency quit */
75 fd = 2;
76 if (fd == 2) {
77 /* XXX: are we happy to lose stuff here? */
78 xwrite(fd, data, sz);
79 return;
80 }
81 write_or_die(fd, data, sz);
82}
83static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
85{
86 FILE *fp = cb_data;
87 if (graft->nr_parent == -1)
88 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
89 return 0;
90}
91static void create_pack_file(void)
93{
94 struct child_process pack_objects = CHILD_PROCESS_INIT;
95 char data[8193], progress[128];
96 char abort_msg[] = "aborting due to possible repository "
97 "corruption on the remote side.";
98 int buffered = -1;
99 ssize_t sz;
100 int i;
101 FILE *pipe_fd;
102 if (!pack_objects_hook)
104 pack_objects.git_cmd = 1;
105 else {
106 argv_array_push(&pack_objects.args, pack_objects_hook);
107 argv_array_push(&pack_objects.args, "git");
108 pack_objects.use_shell = 1;
109 }
110 if (shallow_nr) {
112 argv_array_push(&pack_objects.args, "--shallow-file");
113 argv_array_push(&pack_objects.args, "");
114 }
115 argv_array_push(&pack_objects.args, "pack-objects");
116 argv_array_push(&pack_objects.args, "--revs");
117 if (use_thin_pack)
118 argv_array_push(&pack_objects.args, "--thin");
119 argv_array_push(&pack_objects.args, "--stdout");
121 if (shallow_nr)
122 argv_array_push(&pack_objects.args, "--shallow");
123 if (!no_progress)
124 argv_array_push(&pack_objects.args, "--progress");
125 if (use_ofs_delta)
126 argv_array_push(&pack_objects.args, "--delta-base-offset");
127 if (use_include_tag)
128 argv_array_push(&pack_objects.args, "--include-tag");
129 pack_objects.in = -1;
131 pack_objects.out = -1;
132 pack_objects.err = -1;
133 if (start_command(&pack_objects))
135 die("git upload-pack: unable to fork git-pack-objects");
136 pipe_fd = xfdopen(pack_objects.in, "w");
138 if (shallow_nr)
140 for_each_commit_graft(write_one_shallow, pipe_fd);
141 for (i = 0; i < want_obj.nr; i++)
143 fprintf(pipe_fd, "%s\n",
144 oid_to_hex(&want_obj.objects[i].item->oid));
145 fprintf(pipe_fd, "--not\n");
146 for (i = 0; i < have_obj.nr; i++)
147 fprintf(pipe_fd, "%s\n",
148 oid_to_hex(&have_obj.objects[i].item->oid));
149 for (i = 0; i < extra_edge_obj.nr; i++)
150 fprintf(pipe_fd, "%s\n",
151 oid_to_hex(&extra_edge_obj.objects[i].item->oid));
152 fprintf(pipe_fd, "\n");
153 fflush(pipe_fd);
154 fclose(pipe_fd);
155 /* We read from pack_objects.err to capture stderr output for
157 * progress bar, and pack_objects.out to capture the pack data.
158 */
159 while (1) {
161 struct pollfd pfd[2];
162 int pe, pu, pollsize;
163 int ret;
164 reset_timeout();
166 pollsize = 0;
168 pe = pu = -1;
169 if (0 <= pack_objects.out) {
171 pfd[pollsize].fd = pack_objects.out;
172 pfd[pollsize].events = POLLIN;
173 pu = pollsize;
174 pollsize++;
175 }
176 if (0 <= pack_objects.err) {
177 pfd[pollsize].fd = pack_objects.err;
178 pfd[pollsize].events = POLLIN;
179 pe = pollsize;
180 pollsize++;
181 }
182 if (!pollsize)
184 break;
185 ret = poll(pfd, pollsize,
187 keepalive < 0 ? -1 : 1000 * keepalive);
188 if (ret < 0) {
190 if (errno != EINTR) {
191 error_errno("poll failed, resuming");
192 sleep(1);
193 }
194 continue;
195 }
196 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
197 /* Status ready; we ship that in the side-band
198 * or dump to the standard error.
199 */
200 sz = xread(pack_objects.err, progress,
201 sizeof(progress));
202 if (0 < sz)
203 send_client_data(2, progress, sz);
204 else if (sz == 0) {
205 close(pack_objects.err);
206 pack_objects.err = -1;
207 }
208 else
209 goto fail;
210 /* give priority to status messages */
211 continue;
212 }
213 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
214 /* Data ready; we keep the last byte to ourselves
215 * in case we detect broken rev-list, so that we
216 * can leave the stream corrupted. This is
217 * unfortunate -- unpack-objects would happily
218 * accept a valid packdata with trailing garbage,
219 * so appending garbage after we pass all the
220 * pack data is not good enough to signal
221 * breakage to downstream.
222 */
223 char *cp = data;
224 ssize_t outsz = 0;
225 if (0 <= buffered) {
226 *cp++ = buffered;
227 outsz++;
228 }
229 sz = xread(pack_objects.out, cp,
230 sizeof(data) - outsz);
231 if (0 < sz)
232 ;
233 else if (sz == 0) {
234 close(pack_objects.out);
235 pack_objects.out = -1;
236 }
237 else
238 goto fail;
239 sz += outsz;
240 if (1 < sz) {
241 buffered = data[sz-1] & 0xFF;
242 sz--;
243 }
244 else
245 buffered = -1;
246 send_client_data(1, data, sz);
247 }
248 /*
250 * We hit the keepalive timeout without saying anything; send
251 * an empty message on the data sideband just to let the other
252 * side know we're still working on it, but don't have any data
253 * yet.
254 *
255 * If we don't have a sideband channel, there's no room in the
256 * protocol to say anything, so those clients are just out of
257 * luck.
258 */
259 if (!ret && use_sideband) {
260 static const char buf[] = "0005\1";
261 write_or_die(1, buf, 5);
262 }
263 }
264 if (finish_command(&pack_objects)) {
266 error("git upload-pack: git-pack-objects died with error.");
267 goto fail;
268 }
269 /* flush the data */
271 if (0 <= buffered) {
272 data[0] = buffered;
273 send_client_data(1, data, 1);
274 fprintf(stderr, "flushed.\n");
275 }
276 if (use_sideband)
277 packet_flush(1);
278 return;
279 fail:
281 send_client_data(3, abort_msg, sizeof(abort_msg));
282 die("git upload-pack: %s", abort_msg);
283}
284static int got_oid(const char *hex, struct object_id *oid)
286{
287 struct object *o;
288 int we_knew_they_have = 0;
289 if (get_oid_hex(hex, oid))
291 die("git upload-pack: expected SHA1 object, got '%s'", hex);
292 if (!has_object_file(oid))
293 return -1;
294 o = parse_object(oid);
296 if (!o)
297 die("oops (%s)", oid_to_hex(oid));
298 if (o->type == OBJ_COMMIT) {
299 struct commit_list *parents;
300 struct commit *commit = (struct commit *)o;
301 if (o->flags & THEY_HAVE)
302 we_knew_they_have = 1;
303 else
304 o->flags |= THEY_HAVE;
305 if (!oldest_have || (commit->date < oldest_have))
306 oldest_have = commit->date;
307 for (parents = commit->parents;
308 parents;
309 parents = parents->next)
310 parents->item->object.flags |= THEY_HAVE;
311 }
312 if (!we_knew_they_have) {
313 add_object_array(o, NULL, &have_obj);
314 return 1;
315 }
316 return 0;
317}
318static int reachable(struct commit *want)
320{
321 struct prio_queue work = { compare_commits_by_commit_date };
322 prio_queue_put(&work, want);
324 while (work.nr) {
325 struct commit_list *list;
326 struct commit *commit = prio_queue_get(&work);
327 if (commit->object.flags & THEY_HAVE) {
329 want->object.flags |= COMMON_KNOWN;
330 break;
331 }
332 if (!commit->object.parsed)
333 parse_object(&commit->object.oid);
334 if (commit->object.flags & REACHABLE)
335 continue;
336 commit->object.flags |= REACHABLE;
337 if (commit->date < oldest_have)
338 continue;
339 for (list = commit->parents; list; list = list->next) {
340 struct commit *parent = list->item;
341 if (!(parent->object.flags & REACHABLE))
342 prio_queue_put(&work, parent);
343 }
344 }
345 want->object.flags |= REACHABLE;
346 clear_commit_marks(want, REACHABLE);
347 clear_prio_queue(&work);
348 return (want->object.flags & COMMON_KNOWN);
349}
350static int ok_to_give_up(void)
352{
353 int i;
354 if (!have_obj.nr)
356 return 0;
357 for (i = 0; i < want_obj.nr; i++) {
359 struct object *want = want_obj.objects[i].item;
360 if (want->flags & COMMON_KNOWN)
362 continue;
363 want = deref_tag(want, "a want line", 0);
364 if (!want || want->type != OBJ_COMMIT) {
365 /* no way to tell if this is reachable by
366 * looking at the ancestry chain alone, so
367 * leave a note to ourselves not to worry about
368 * this object anymore.
369 */
370 want_obj.objects[i].item->flags |= COMMON_KNOWN;
371 continue;
372 }
373 if (!reachable((struct commit *)want))
374 return 0;
375 }
376 return 1;
377}
378static int get_common_commits(void)
380{
381 struct object_id oid;
382 char last_hex[GIT_MAX_HEXSZ + 1];
383 int got_common = 0;
384 int got_other = 0;
385 int sent_ready = 0;
386 save_commit_buffer = 0;
388 for (;;) {
390 char *line = packet_read_line(0, NULL);
391 const char *arg;
392 reset_timeout();
394 if (!line) {
396 if (multi_ack == 2 && got_common
397 && !got_other && ok_to_give_up()) {
398 sent_ready = 1;
399 packet_write_fmt(1, "ACK %s ready\n", last_hex);
400 }
401 if (have_obj.nr == 0 || multi_ack)
402 packet_write_fmt(1, "NAK\n");
403 if (no_done && sent_ready) {
405 packet_write_fmt(1, "ACK %s\n", last_hex);
406 return 0;
407 }
408 if (stateless_rpc)
409 exit(0);
410 got_common = 0;
411 got_other = 0;
412 continue;
413 }
414 if (skip_prefix(line, "have ", &arg)) {
415 switch (got_oid(arg, &oid)) {
416 case -1: /* they have what we do not */
417 got_other = 1;
418 if (multi_ack && ok_to_give_up()) {
419 const char *hex = oid_to_hex(&oid);
420 if (multi_ack == 2) {
421 sent_ready = 1;
422 packet_write_fmt(1, "ACK %s ready\n", hex);
423 } else
424 packet_write_fmt(1, "ACK %s continue\n", hex);
425 }
426 break;
427 default:
428 got_common = 1;
429 memcpy(last_hex, oid_to_hex(&oid), 41);
430 if (multi_ack == 2)
431 packet_write_fmt(1, "ACK %s common\n", last_hex);
432 else if (multi_ack)
433 packet_write_fmt(1, "ACK %s continue\n", last_hex);
434 else if (have_obj.nr == 1)
435 packet_write_fmt(1, "ACK %s\n", last_hex);
436 break;
437 }
438 continue;
439 }
440 if (!strcmp(line, "done")) {
441 if (have_obj.nr > 0) {
442 if (multi_ack)
443 packet_write_fmt(1, "ACK %s\n", last_hex);
444 return 0;
445 }
446 packet_write_fmt(1, "NAK\n");
447 return -1;
448 }
449 die("git upload-pack: expected SHA1 list, got '%s'", line);
450 }
451}
452static int is_our_ref(struct object *o)
454{
455 int allow_hidden_ref = (allow_unadvertised_object_request &
456 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
457 return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
458}
459/*
461 * on successful case, it's up to the caller to close cmd->out
462 */
463static int do_reachable_revlist(struct child_process *cmd,
464 struct object_array *src,
465 struct object_array *reachable)
466{
467 static const char *argv[] = {
468 "rev-list", "--stdin", NULL,
469 };
470 struct object *o;
471 char namebuf[42]; /* ^ + SHA-1 + LF */
472 int i;
473 cmd->argv = argv;
475 cmd->git_cmd = 1;
476 cmd->no_stderr = 1;
477 cmd->in = -1;
478 cmd->out = -1;
479 /*
481 * If the next rev-list --stdin encounters an unknown commit,
482 * it terminates, which will cause SIGPIPE in the write loop
483 * below.
484 */
485 sigchain_push(SIGPIPE, SIG_IGN);
486 if (start_command(cmd))
488 goto error;
489 namebuf[0] = '^';
491 namebuf[GIT_SHA1_HEXSZ + 1] = '\n';
492 for (i = get_max_object_index(); 0 < i; ) {
493 o = get_indexed_object(--i);
494 if (!o)
495 continue;
496 if (reachable && o->type == OBJ_COMMIT)
497 o->flags &= ~TMP_MARK;
498 if (!is_our_ref(o))
499 continue;
500 memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
501 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 2) < 0)
502 goto error;
503 }
504 namebuf[GIT_SHA1_HEXSZ] = '\n';
505 for (i = 0; i < src->nr; i++) {
506 o = src->objects[i].item;
507 if (is_our_ref(o)) {
508 if (reachable)
509 add_object_array(o, NULL, reachable);
510 continue;
511 }
512 if (reachable && o->type == OBJ_COMMIT)
513 o->flags |= TMP_MARK;
514 memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
515 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 1) < 0)
516 goto error;
517 }
518 close(cmd->in);
519 cmd->in = -1;
520 sigchain_pop(SIGPIPE);
521 return 0;
523error:
525 sigchain_pop(SIGPIPE);
526 if (cmd->in >= 0)
528 close(cmd->in);
529 if (cmd->out >= 0)
530 close(cmd->out);
531 return -1;
532}
533static int get_reachable_list(struct object_array *src,
535 struct object_array *reachable)
536{
537 struct child_process cmd = CHILD_PROCESS_INIT;
538 int i;
539 struct object *o;
540 char namebuf[42]; /* ^ + SHA-1 + LF */
541 if (do_reachable_revlist(&cmd, src, reachable) < 0)
543 return -1;
544 while ((i = read_in_full(cmd.out, namebuf, 41)) == 41) {
546 struct object_id sha1;
547 if (namebuf[40] != '\n' || get_oid_hex(namebuf, &sha1))
549 break;
550 o = lookup_object(sha1.hash);
552 if (o && o->type == OBJ_COMMIT) {
553 o->flags &= ~TMP_MARK;
554 }
555 }
556 for (i = get_max_object_index(); 0 < i; i--) {
557 o = get_indexed_object(i - 1);
558 if (o && o->type == OBJ_COMMIT &&
559 (o->flags & TMP_MARK)) {
560 add_object_array(o, NULL, reachable);
561 o->flags &= ~TMP_MARK;
562 }
563 }
564 close(cmd.out);
565 if (finish_command(&cmd))
567 return -1;
568 return 0;
570}
571static int has_unreachable(struct object_array *src)
573{
574 struct child_process cmd = CHILD_PROCESS_INIT;
575 char buf[1];
576 int i;
577 if (do_reachable_revlist(&cmd, src, NULL) < 0)
579 return 1;
580 /*
582 * The commits out of the rev-list are not ancestors of
583 * our ref.
584 */
585 i = read_in_full(cmd.out, buf, 1);
586 if (i)
587 goto error;
588 close(cmd.out);
589 cmd.out = -1;
590 /*
592 * rev-list may have died by encountering a bad commit
593 * in the history, in which case we do want to bail out
594 * even when it showed no commit.
595 */
596 if (finish_command(&cmd))
597 goto error;
598 /* All the non-tip ones are ancestors of what we advertised */
600 return 0;
601error:
603 sigchain_pop(SIGPIPE);
604 if (cmd.out >= 0)
605 close(cmd.out);
606 return 1;
607}
608static void check_non_tip(void)
610{
611 int i;
612 /*
614 * In the normal in-process case without
615 * uploadpack.allowReachableSHA1InWant,
616 * non-tip requests can never happen.
617 */
618 if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
619 goto error;
620 if (!has_unreachable(&want_obj))
621 /* All the non-tip ones are ancestors of what we advertised */
622 return;
623error:
625 /* Pick one of them (we know there at least is one) */
626 for (i = 0; i < want_obj.nr; i++) {
627 struct object *o = want_obj.objects[i].item;
628 if (!is_our_ref(o))
629 die("git upload-pack: not our ref %s",
630 oid_to_hex(&o->oid));
631 }
632}
633static void send_shallow(struct commit_list *result)
635{
636 while (result) {
637 struct object *object = &result->item->object;
638 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
639 packet_write_fmt(1, "shallow %s",
640 oid_to_hex(&object->oid));
641 register_shallow(&object->oid);
642 shallow_nr++;
643 }
644 result = result->next;
645 }
646}
647static void send_unshallow(const struct object_array *shallows)
649{
650 int i;
651 for (i = 0; i < shallows->nr; i++) {
653 struct object *object = shallows->objects[i].item;
654 if (object->flags & NOT_SHALLOW) {
655 struct commit_list *parents;
656 packet_write_fmt(1, "unshallow %s",
657 oid_to_hex(&object->oid));
658 object->flags &= ~CLIENT_SHALLOW;
659 /*
660 * We want to _register_ "object" as shallow, but we
661 * also need to traverse object's parents to deepen a
662 * shallow clone. Unregister it for now so we can
663 * parse and add the parents to the want list, then
664 * re-register it.
665 */
666 unregister_shallow(&object->oid);
667 object->parsed = 0;
668 parse_commit_or_die((struct commit *)object);
669 parents = ((struct commit *)object)->parents;
670 while (parents) {
671 add_object_array(&parents->item->object,
672 NULL, &want_obj);
673 parents = parents->next;
674 }
675 add_object_array(object, NULL, &extra_edge_obj);
676 }
677 /* make sure commit traversal conforms to client */
678 register_shallow(&object->oid);
679 }
680}
681static void deepen(int depth, int deepen_relative,
683 struct object_array *shallows)
684{
685 if (depth == INFINITE_DEPTH && !is_repository_shallow()) {
686 int i;
687 for (i = 0; i < shallows->nr; i++) {
689 struct object *object = shallows->objects[i].item;
690 object->flags |= NOT_SHALLOW;
691 }
692 } else if (deepen_relative) {
693 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
694 struct commit_list *result;
695 get_reachable_list(shallows, &reachable_shallows);
697 result = get_shallow_commits(&reachable_shallows,
698 depth + 1,
699 SHALLOW, NOT_SHALLOW);
700 send_shallow(result);
701 free_commit_list(result);
702 object_array_clear(&reachable_shallows);
703 } else {
704 struct commit_list *result;
705 result = get_shallow_commits(&want_obj, depth,
707 SHALLOW, NOT_SHALLOW);
708 send_shallow(result);
709 free_commit_list(result);
710 }
711 send_unshallow(shallows);
713}
714static void deepen_by_rev_list(int ac, const char **av,
716 struct object_array *shallows)
717{
718 struct commit_list *result;
719 result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
721 send_shallow(result);
722 free_commit_list(result);
723 send_unshallow(shallows);
724}
725/* Returns 1 if a shallow list is sent or 0 otherwise */
727static int send_shallow_list(int depth, int deepen_rev_list,
728 timestamp_t deepen_since,
729 struct string_list *deepen_not,
730 struct object_array *shallows)
731{
732 int ret = 0;
733 if (depth > 0 && deepen_rev_list)
735 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
736 if (depth > 0) {
737 deepen(depth, deepen_relative, shallows);
738 ret = 1;
739 } else if (deepen_rev_list) {
740 struct argv_array av = ARGV_ARRAY_INIT;
741 int i;
742 argv_array_push(&av, "rev-list");
744 if (deepen_since)
745 argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
746 if (deepen_not->nr) {
747 argv_array_push(&av, "--not");
748 for (i = 0; i < deepen_not->nr; i++) {
749 struct string_list_item *s = deepen_not->items + i;
750 argv_array_push(&av, s->string);
751 }
752 argv_array_push(&av, "--not");
753 }
754 for (i = 0; i < want_obj.nr; i++) {
755 struct object *o = want_obj.objects[i].item;
756 argv_array_push(&av, oid_to_hex(&o->oid));
757 }
758 deepen_by_rev_list(av.argc, av.argv, shallows);
759 argv_array_clear(&av);
760 ret = 1;
761 } else {
762 if (shallows->nr > 0) {
763 int i;
764 for (i = 0; i < shallows->nr; i++)
765 register_shallow(&shallows->objects[i].item->oid);
766 }
767 }
768 shallow_nr += shallows->nr;
770 return ret;
771}
772static int process_shallow(const char *line, struct object_array *shallows)
774{
775 const char *arg;
776 if (skip_prefix(line, "shallow ", &arg)) {
777 struct object_id oid;
778 struct object *object;
779 if (get_oid_hex(arg, &oid))
780 die("invalid shallow line: %s", line);
781 object = parse_object(&oid);
782 if (!object)
783 return 1;
784 if (object->type != OBJ_COMMIT)
785 die("invalid shallow object %s", oid_to_hex(&oid));
786 if (!(object->flags & CLIENT_SHALLOW)) {
787 object->flags |= CLIENT_SHALLOW;
788 add_object_array(object, NULL, shallows);
789 }
790 return 1;
791 }
792 return 0;
794}
795static int process_deepen(const char *line, int *depth)
797{
798 const char *arg;
799 if (skip_prefix(line, "deepen ", &arg)) {
800 char *end = NULL;
801 *depth = (int)strtol(arg, &end, 0);
802 if (!end || *end || *depth <= 0)
803 die("Invalid deepen: %s", line);
804 return 1;
805 }
806 return 0;
808}
809static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
811{
812 const char *arg;
813 if (skip_prefix(line, "deepen-since ", &arg)) {
814 char *end = NULL;
815 *deepen_since = parse_timestamp(arg, &end, 0);
816 if (!end || *end || !deepen_since ||
817 /* revisions.c's max_age -1 is special */
818 *deepen_since == -1)
819 die("Invalid deepen-since: %s", line);
820 *deepen_rev_list = 1;
821 return 1;
822 }
823 return 0;
824}
825static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
827{
828 const char *arg;
829 if (skip_prefix(line, "deepen-not ", &arg)) {
830 char *ref = NULL;
831 struct object_id oid;
832 if (expand_ref(arg, strlen(arg), &oid, &ref) != 1)
833 die("git upload-pack: ambiguous deepen-not: %s", line);
834 string_list_append(deepen_not, ref);
835 free(ref);
836 *deepen_rev_list = 1;
837 return 1;
838 }
839 return 0;
840}
841static void receive_needs(void)
843{
844 struct object_array shallows = OBJECT_ARRAY_INIT;
845 struct string_list deepen_not = STRING_LIST_INIT_DUP;
846 int depth = 0;
847 int has_non_tip = 0;
848 timestamp_t deepen_since = 0;
849 int deepen_rev_list = 0;
850 shallow_nr = 0;
852 for (;;) {
853 struct object *o;
854 const char *features;
855 struct object_id oid_buf;
856 char *line = packet_read_line(0, NULL);
857 const char *arg;
858 reset_timeout();
860 if (!line)
861 break;
862 if (process_shallow(line, &shallows))
864 continue;
865 if (process_deepen(line, &depth))
866 continue;
867 if (process_deepen_since(line, &deepen_since, &deepen_rev_list))
868 continue;
869 if (process_deepen_not(line, &deepen_not, &deepen_rev_list))
870 continue;
871 if (!skip_prefix(line, "want ", &arg) ||
873 get_oid_hex(arg, &oid_buf))
874 die("git upload-pack: protocol error, "
875 "expected to get sha, not '%s'", line);
876 features = arg + 40;
878 if (parse_feature_request(features, "deepen-relative"))
880 deepen_relative = 1;
881 if (parse_feature_request(features, "multi_ack_detailed"))
882 multi_ack = 2;
883 else if (parse_feature_request(features, "multi_ack"))
884 multi_ack = 1;
885 if (parse_feature_request(features, "no-done"))
886 no_done = 1;
887 if (parse_feature_request(features, "thin-pack"))
888 use_thin_pack = 1;
889 if (parse_feature_request(features, "ofs-delta"))
890 use_ofs_delta = 1;
891 if (parse_feature_request(features, "side-band-64k"))
892 use_sideband = LARGE_PACKET_MAX;
893 else if (parse_feature_request(features, "side-band"))
894 use_sideband = DEFAULT_PACKET_MAX;
895 if (parse_feature_request(features, "no-progress"))
896 no_progress = 1;
897 if (parse_feature_request(features, "include-tag"))
898 use_include_tag = 1;
899 o = parse_object(&oid_buf);
901 if (!o) {
902 packet_write_fmt(1,
903 "ERR upload-pack: not our ref %s",
904 oid_to_hex(&oid_buf));
905 die("git upload-pack: not our ref %s",
906 oid_to_hex(&oid_buf));
907 }
908 if (!(o->flags & WANTED)) {
909 o->flags |= WANTED;
910 if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
911 || is_our_ref(o)))
912 has_non_tip = 1;
913 add_object_array(o, NULL, &want_obj);
914 }
915 }
916 /*
918 * We have sent all our refs already, and the other end
919 * should have chosen out of them. When we are operating
920 * in the stateless RPC mode, however, their choice may
921 * have been based on the set of older refs advertised
922 * by another process that handled the initial request.
923 */
924 if (has_non_tip)
925 check_non_tip();
926 if (!use_sideband && daemon_mode)
928 no_progress = 1;
929 if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
931 return;
932 if (send_shallow_list(depth, deepen_rev_list, deepen_since,
934 &deepen_not, &shallows))
935 packet_flush(1);
936 object_array_clear(&shallows);
937}
938/* return non-zero if the ref is hidden, otherwise 0 */
940static int mark_our_ref(const char *refname, const char *refname_full,
941 const struct object_id *oid)
942{
943 struct object *o = lookup_unknown_object(oid->hash);
944 if (ref_is_hidden(refname, refname_full)) {
946 o->flags |= HIDDEN_REF;
947 return 1;
948 }
949 o->flags |= OUR_REF;
950 return 0;
951}
952static int check_ref(const char *refname_full, const struct object_id *oid,
954 int flag, void *cb_data)
955{
956 const char *refname = strip_namespace(refname_full);
957 mark_our_ref(refname, refname_full, oid);
959 return 0;
960}
961static void format_symref_info(struct strbuf *buf, struct string_list *symref)
963{
964 struct string_list_item *item;
965 if (!symref->nr)
967 return;
968 for_each_string_list_item(item, symref)
969 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
970}
971static int send_ref(const char *refname, const struct object_id *oid,
973 int flag, void *cb_data)
974{
975 static const char *capabilities = "multi_ack thin-pack side-band"
976 " side-band-64k ofs-delta shallow deepen-since deepen-not"
977 " deepen-relative no-progress include-tag multi_ack_detailed";
978 const char *refname_nons = strip_namespace(refname);
979 struct object_id peeled;
980 if (mark_our_ref(refname_nons, refname, oid))
982 return 0;
983 if (capabilities) {
985 struct strbuf symref_info = STRBUF_INIT;
986 format_symref_info(&symref_info, cb_data);
988 packet_write_fmt(1, "%s %s%c%s%s%s%s%s agent=%s\n",
989 oid_to_hex(oid), refname_nons,
990 0, capabilities,
991 (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
992 " allow-tip-sha1-in-want" : "",
993 (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
994 " allow-reachable-sha1-in-want" : "",
995 stateless_rpc ? " no-done" : "",
996 symref_info.buf,
997 git_user_agent_sanitized());
998 strbuf_release(&symref_info);
999 } else {
1000 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1001 }
1002 capabilities = NULL;
1003 if (!peel_ref(refname, &peeled))
1004 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1005 return 0;
1006}
1007static int find_symref(const char *refname, const struct object_id *oid,
1009 int flag, void *cb_data)
1010{
1011 const char *symref_target;
1012 struct string_list_item *item;
1013 if ((flag & REF_ISSYMREF) == 0)
1015 return 0;
1016 symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1017 if (!symref_target || (flag & REF_ISSYMREF) == 0)
1018 die("'%s' is a symref but it is not?", refname);
1019 item = string_list_append(cb_data, refname);
1020 item->util = xstrdup(symref_target);
1021 return 0;
1022}
1023static int upload_pack_config(const char *var, const char *value, void *unused)
1025{
1026 if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1027 if (git_config_bool(var, value))
1028 allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1029 else
1030 allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1031 } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1032 if (git_config_bool(var, value))
1033 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1034 else
1035 allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1036 } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1037 if (git_config_bool(var, value))
1038 allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1039 else
1040 allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1041 } else if (!strcmp("uploadpack.keepalive", var)) {
1042 keepalive = git_config_int(var, value);
1043 if (!keepalive)
1044 keepalive = -1;
1045 } else if (current_config_scope() != CONFIG_SCOPE_REPO) {
1046 if (!strcmp("uploadpack.packobjectshook", var))
1047 return git_config_string(&pack_objects_hook, var, value);
1048 }
1049 return parse_hide_refs_config(var, value, "uploadpack");
1050}
1051void upload_pack(struct upload_pack_options *options)
1053{
1054 struct string_list symref = STRING_LIST_INIT_DUP;
1055 stateless_rpc = options->stateless_rpc;
1057 timeout = options->timeout;
1058 daemon_mode = options->daemon_mode;
1059 git_config(upload_pack_config, NULL);
1061 head_ref_namespaced(find_symref, &symref);
1063 if (options->advertise_refs || !stateless_rpc) {
1065 reset_timeout();
1066 head_ref_namespaced(send_ref, &symref);
1067 for_each_namespaced_ref(send_ref, &symref);
1068 advertise_shallow_grafts(1);
1069 packet_flush(1);
1070 } else {
1071 head_ref_namespaced(check_ref, NULL);
1072 for_each_namespaced_ref(check_ref, NULL);
1073 }
1074 string_list_clear(&symref, 1);
1075 if (options->advertise_refs)
1076 return;
1077 receive_needs();
1079 if (want_obj.nr) {
1080 get_common_commits();
1081 create_pack_file();
1082 }
1083}
1084struct upload_pack_data {
1086 struct object_array wants;
1087 struct oid_array haves;
1088 struct object_array shallows;
1090 struct string_list deepen_not;
1091 int depth;
1092 timestamp_t deepen_since;
1093 int deepen_rev_list;
1094 int deepen_relative;
1095 unsigned stateless_rpc : 1;
1097 unsigned use_thin_pack : 1;
1099 unsigned use_ofs_delta : 1;
1100 unsigned no_progress : 1;
1101 unsigned use_include_tag : 1;
1102 unsigned done : 1;
1103};
1104static void upload_pack_data_init(struct upload_pack_data *data)
1106{
1107 struct object_array wants = OBJECT_ARRAY_INIT;
1108 struct oid_array haves = OID_ARRAY_INIT;
1109 struct object_array shallows = OBJECT_ARRAY_INIT;
1110 struct string_list deepen_not = STRING_LIST_INIT_DUP;
1111 memset(data, 0, sizeof(*data));
1113 data->wants = wants;
1114 data->haves = haves;
1115 data->shallows = shallows;
1116 data->deepen_not = deepen_not;
1117}
1118static void upload_pack_data_clear(struct upload_pack_data *data)
1120{
1121 object_array_clear(&data->wants);
1122 oid_array_clear(&data->haves);
1123 object_array_clear(&data->shallows);
1124 string_list_clear(&data->deepen_not, 0);
1125}
1126static int parse_want(const char *line)
1128{
1129 const char *arg;
1130 if (skip_prefix(line, "want ", &arg)) {
1131 struct object_id oid;
1132 struct object *o;
1133 if (get_oid_hex(arg, &oid))
1135 die("git upload-pack: protocol error, "
1136 "expected to get oid, not '%s'", line);
1137 o = parse_object(&oid);
1139 if (!o) {
1140 packet_write_fmt(1,
1141 "ERR upload-pack: not our ref %s",
1142 oid_to_hex(&oid));
1143 die("git upload-pack: not our ref %s",
1144 oid_to_hex(&oid));
1145 }
1146 if (!(o->flags & WANTED)) {
1148 o->flags |= WANTED;
1149 add_object_array(o, NULL, &want_obj);
1150 }
1151 return 1;
1153 }
1154 return 0;
1156}
1157static int parse_have(const char *line, struct oid_array *haves)
1159{
1160 const char *arg;
1161 if (skip_prefix(line, "have ", &arg)) {
1162 struct object_id oid;
1163 if (get_oid_hex(arg, &oid))
1165 die("git upload-pack: expected SHA1 object, got '%s'", arg);
1166 oid_array_append(haves, &oid);
1167 return 1;
1168 }
1169 return 0;
1171}
1172static void process_args(struct packet_reader *request,
1174 struct upload_pack_data *data)
1175{
1176 while (packet_reader_read(request) != PACKET_READ_FLUSH) {
1177 const char *arg = request->line;
1178 /* process want */
1180 if (parse_want(arg))
1181 continue;
1182 /* process have line */
1183 if (parse_have(arg, &data->haves))
1184 continue;
1185 /* process args like thin-pack */
1187 if (!strcmp(arg, "thin-pack")) {
1188 use_thin_pack = 1;
1189 continue;
1190 }
1191 if (!strcmp(arg, "ofs-delta")) {
1192 use_ofs_delta = 1;
1193 continue;
1194 }
1195 if (!strcmp(arg, "no-progress")) {
1196 no_progress = 1;
1197 continue;
1198 }
1199 if (!strcmp(arg, "include-tag")) {
1200 use_include_tag = 1;
1201 continue;
1202 }
1203 if (!strcmp(arg, "done")) {
1204 data->done = 1;
1205 continue;
1206 }
1207 /* Shallow related arguments */
1209 if (process_shallow(arg, &data->shallows))
1210 continue;
1211 if (process_deepen(arg, &data->depth))
1212 continue;
1213 if (process_deepen_since(arg, &data->deepen_since,
1214 &data->deepen_rev_list))
1215 continue;
1216 if (process_deepen_not(arg, &data->deepen_not,
1217 &data->deepen_rev_list))
1218 continue;
1219 if (!strcmp(arg, "deepen-relative")) {
1220 data->deepen_relative = 1;
1221 continue;
1222 }
1223 /* ignore unknown lines maybe? */
1225 die("unexpect line: '%s'", arg);
1226 }
1227}
1228static int process_haves(struct oid_array *haves, struct oid_array *common)
1230{
1231 int i;
1232 /* Process haves */
1234 for (i = 0; i < haves->nr; i++) {
1235 const struct object_id *oid = &haves->oid[i];
1236 struct object *o;
1237 int we_knew_they_have = 0;
1238 if (!has_object_file(oid))
1240 continue;
1241 oid_array_append(common, oid);
1243 o = parse_object(oid);
1245 if (!o)
1246 die("oops (%s)", oid_to_hex(oid));
1247 if (o->type == OBJ_COMMIT) {
1248 struct commit_list *parents;
1249 struct commit *commit = (struct commit *)o;
1250 if (o->flags & THEY_HAVE)
1251 we_knew_they_have = 1;
1252 else
1253 o->flags |= THEY_HAVE;
1254 if (!oldest_have || (commit->date < oldest_have))
1255 oldest_have = commit->date;
1256 for (parents = commit->parents;
1257 parents;
1258 parents = parents->next)
1259 parents->item->object.flags |= THEY_HAVE;
1260 }
1261 if (!we_knew_they_have)
1262 add_object_array(o, NULL, &have_obj);
1263 }
1264 return 0;
1266}
1267static int send_acks(struct oid_array *acks, struct strbuf *response)
1269{
1270 int i;
1271 packet_buf_write(response, "acknowledgments\n");
1273 /* Send Acks */
1275 if (!acks->nr)
1276 packet_buf_write(response, "NAK\n");
1277 for (i = 0; i < acks->nr; i++) {
1279 packet_buf_write(response, "ACK %s\n",
1280 oid_to_hex(&acks->oid[i]));
1281 }
1282 if (ok_to_give_up()) {
1284 /* Send Ready */
1285 packet_buf_write(response, "ready\n");
1286 return 1;
1287 }
1288 return 0;
1290}
1291static int process_haves_and_send_acks(struct upload_pack_data *data)
1293{
1294 struct oid_array common = OID_ARRAY_INIT;
1295 struct strbuf response = STRBUF_INIT;
1296 int ret = 0;
1297 process_haves(&data->haves, &common);
1299 if (data->done) {
1300 ret = 1;
1301 } else if (send_acks(&common, &response)) {
1302 packet_buf_delim(&response);
1303 ret = 1;
1304 } else {
1305 /* Add Flush */
1306 packet_buf_flush(&response);
1307 ret = 0;
1308 }
1309 /* Send response */
1311 write_or_die(1, response.buf, response.len);
1312 strbuf_release(&response);
1313 oid_array_clear(&data->haves);
1315 oid_array_clear(&common);
1316 return ret;
1317}
1318static void send_shallow_info(struct upload_pack_data *data)
1320{
1321 /* No shallow info needs to be sent */
1322 if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1323 !is_repository_shallow())
1324 return;
1325 packet_write_fmt(1, "shallow-info\n");
1327 if (!send_shallow_list(data->depth, data->deepen_rev_list,
1329 data->deepen_since, &data->deepen_not,
1330 &data->shallows) && is_repository_shallow())
1331 deepen(INFINITE_DEPTH, data->deepen_relative, &data->shallows);
1332 packet_delim(1);
1334}
1335enum fetch_state {
1337 FETCH_PROCESS_ARGS = 0,
1338 FETCH_SEND_ACKS,
1339 FETCH_SEND_PACK,
1340 FETCH_DONE,
1341};
1342int upload_pack_v2(struct repository *r, struct argv_array *keys,
1344 struct packet_reader *request)
1345{
1346 enum fetch_state state = FETCH_PROCESS_ARGS;
1347 struct upload_pack_data data;
1348 upload_pack_data_init(&data);
1350 use_sideband = LARGE_PACKET_MAX;
1351 while (state != FETCH_DONE) {
1353 switch (state) {
1354 case FETCH_PROCESS_ARGS:
1355 process_args(request, &data);
1356 if (!want_obj.nr) {
1358 /*
1359 * Request didn't contain any 'want' lines,
1360 * guess they didn't want anything.
1361 */
1362 state = FETCH_DONE;
1363 } else if (data.haves.nr) {
1364 /*
1365 * Request had 'have' lines, so lets ACK them.
1366 */
1367 state = FETCH_SEND_ACKS;
1368 } else {
1369 /*
1370 * Request had 'want's but no 'have's so we can
1371 * immedietly go to construct and send a pack.
1372 */
1373 state = FETCH_SEND_PACK;
1374 }
1375 break;
1376 case FETCH_SEND_ACKS:
1377 if (process_haves_and_send_acks(&data))
1378 state = FETCH_SEND_PACK;
1379 else
1380 state = FETCH_DONE;
1381 break;
1382 case FETCH_SEND_PACK:
1383 send_shallow_info(&data);
1384 packet_write_fmt(1, "packfile\n");
1386 create_pack_file();
1387 state = FETCH_DONE;
1388 break;
1389 case FETCH_DONE:
1390 continue;
1391 }
1392 }
1393 upload_pack_data_clear(&data);
1395 return 0;
1396}
1397int upload_pack_advertise(struct repository *r,
1399 struct strbuf *value)
1400{
1401 if (value)
1402 strbuf_addstr(value, "shallow");
1403 return 1;
1404}