pkt-line: introduce struct packet_writer
[git] / upload-pack.c
1 #include "cache.h"
2 #include "config.h"
3 #include "refs.h"
4 #include "pkt-line.h"
5 #include "sideband.h"
6 #include "repository.h"
7 #include "object-store.h"
8 #include "tag.h"
9 #include "object.h"
10 #include "commit.h"
11 #include "diff.h"
12 #include "revision.h"
13 #include "list-objects.h"
14 #include "list-objects-filter.h"
15 #include "list-objects-filter-options.h"
16 #include "run-command.h"
17 #include "connect.h"
18 #include "sigchain.h"
19 #include "version.h"
20 #include "string-list.h"
21 #include "argv-array.h"
22 #include "prio-queue.h"
23 #include "protocol.h"
24 #include "quote.h"
25 #include "upload-pack.h"
26 #include "serve.h"
27 #include "commit-graph.h"
28 #include "commit-reach.h"
29
30 /* Remember to update object flag allocation in object.h */
31 #define THEY_HAVE       (1u << 11)
32 #define OUR_REF         (1u << 12)
33 #define WANTED          (1u << 13)
34 #define COMMON_KNOWN    (1u << 14)
35
36 #define SHALLOW         (1u << 16)
37 #define NOT_SHALLOW     (1u << 17)
38 #define CLIENT_SHALLOW  (1u << 18)
39 #define HIDDEN_REF      (1u << 19)
40
41 #define ALL_FLAGS (THEY_HAVE | OUR_REF | WANTED | COMMON_KNOWN | SHALLOW | \
42                 NOT_SHALLOW | CLIENT_SHALLOW | HIDDEN_REF)
43
44 static timestamp_t oldest_have;
45
46 static int deepen_relative;
47 static int multi_ack;
48 static int no_done;
49 static int use_thin_pack, use_ofs_delta, use_include_tag;
50 static int no_progress, daemon_mode;
51 /* Allow specifying sha1 if it is a ref tip. */
52 #define ALLOW_TIP_SHA1  01
53 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
54 #define ALLOW_REACHABLE_SHA1    02
55 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
56 #define ALLOW_ANY_SHA1  07
57 static unsigned int allow_unadvertised_object_request;
58 static int shallow_nr;
59 static struct object_array extra_edge_obj;
60 static unsigned int timeout;
61 static int keepalive = 5;
62 /* 0 for no sideband,
63  * otherwise maximum packet size (up to 65520 bytes).
64  */
65 static int use_sideband;
66 static int stateless_rpc;
67 static const char *pack_objects_hook;
68
69 static int filter_capability_requested;
70 static int allow_filter;
71 static int allow_ref_in_want;
72 static struct list_objects_filter_options filter_options;
73
74 static void reset_timeout(void)
75 {
76         alarm(timeout);
77 }
78
79 static void send_client_data(int fd, const char *data, ssize_t sz)
80 {
81         if (use_sideband) {
82                 send_sideband(1, fd, data, sz, use_sideband);
83                 return;
84         }
85         if (fd == 3)
86                 /* emergency quit */
87                 fd = 2;
88         if (fd == 2) {
89                 /* XXX: are we happy to lose stuff here? */
90                 xwrite(fd, data, sz);
91                 return;
92         }
93         write_or_die(fd, data, sz);
94 }
95
96 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
97 {
98         FILE *fp = cb_data;
99         if (graft->nr_parent == -1)
100                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
101         return 0;
102 }
103
104 static void create_pack_file(const struct object_array *have_obj,
105                              const struct object_array *want_obj)
106 {
107         struct child_process pack_objects = CHILD_PROCESS_INIT;
108         char data[8193], progress[128];
109         char abort_msg[] = "aborting due to possible repository "
110                 "corruption on the remote side.";
111         int buffered = -1;
112         ssize_t sz;
113         int i;
114         FILE *pipe_fd;
115
116         if (!pack_objects_hook)
117                 pack_objects.git_cmd = 1;
118         else {
119                 argv_array_push(&pack_objects.args, pack_objects_hook);
120                 argv_array_push(&pack_objects.args, "git");
121                 pack_objects.use_shell = 1;
122         }
123
124         if (shallow_nr) {
125                 argv_array_push(&pack_objects.args, "--shallow-file");
126                 argv_array_push(&pack_objects.args, "");
127         }
128         argv_array_push(&pack_objects.args, "pack-objects");
129         argv_array_push(&pack_objects.args, "--revs");
130         if (use_thin_pack)
131                 argv_array_push(&pack_objects.args, "--thin");
132
133         argv_array_push(&pack_objects.args, "--stdout");
134         if (shallow_nr)
135                 argv_array_push(&pack_objects.args, "--shallow");
136         if (!no_progress)
137                 argv_array_push(&pack_objects.args, "--progress");
138         if (use_ofs_delta)
139                 argv_array_push(&pack_objects.args, "--delta-base-offset");
140         if (use_include_tag)
141                 argv_array_push(&pack_objects.args, "--include-tag");
142         if (filter_options.filter_spec) {
143                 if (pack_objects.use_shell) {
144                         struct strbuf buf = STRBUF_INIT;
145                         sq_quote_buf(&buf, filter_options.filter_spec);
146                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
147                         strbuf_release(&buf);
148                 } else {
149                         argv_array_pushf(&pack_objects.args, "--filter=%s",
150                                          filter_options.filter_spec);
151                 }
152         }
153
154         pack_objects.in = -1;
155         pack_objects.out = -1;
156         pack_objects.err = -1;
157
158         if (start_command(&pack_objects))
159                 die("git upload-pack: unable to fork git-pack-objects");
160
161         pipe_fd = xfdopen(pack_objects.in, "w");
162
163         if (shallow_nr)
164                 for_each_commit_graft(write_one_shallow, pipe_fd);
165
166         for (i = 0; i < want_obj->nr; i++)
167                 fprintf(pipe_fd, "%s\n",
168                         oid_to_hex(&want_obj->objects[i].item->oid));
169         fprintf(pipe_fd, "--not\n");
170         for (i = 0; i < have_obj->nr; i++)
171                 fprintf(pipe_fd, "%s\n",
172                         oid_to_hex(&have_obj->objects[i].item->oid));
173         for (i = 0; i < extra_edge_obj.nr; i++)
174                 fprintf(pipe_fd, "%s\n",
175                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
176         fprintf(pipe_fd, "\n");
177         fflush(pipe_fd);
178         fclose(pipe_fd);
179
180         /* We read from pack_objects.err to capture stderr output for
181          * progress bar, and pack_objects.out to capture the pack data.
182          */
183
184         while (1) {
185                 struct pollfd pfd[2];
186                 int pe, pu, pollsize;
187                 int ret;
188
189                 reset_timeout();
190
191                 pollsize = 0;
192                 pe = pu = -1;
193
194                 if (0 <= pack_objects.out) {
195                         pfd[pollsize].fd = pack_objects.out;
196                         pfd[pollsize].events = POLLIN;
197                         pu = pollsize;
198                         pollsize++;
199                 }
200                 if (0 <= pack_objects.err) {
201                         pfd[pollsize].fd = pack_objects.err;
202                         pfd[pollsize].events = POLLIN;
203                         pe = pollsize;
204                         pollsize++;
205                 }
206
207                 if (!pollsize)
208                         break;
209
210                 ret = poll(pfd, pollsize,
211                         keepalive < 0 ? -1 : 1000 * keepalive);
212
213                 if (ret < 0) {
214                         if (errno != EINTR) {
215                                 error_errno("poll failed, resuming");
216                                 sleep(1);
217                         }
218                         continue;
219                 }
220                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
221                         /* Status ready; we ship that in the side-band
222                          * or dump to the standard error.
223                          */
224                         sz = xread(pack_objects.err, progress,
225                                   sizeof(progress));
226                         if (0 < sz)
227                                 send_client_data(2, progress, sz);
228                         else if (sz == 0) {
229                                 close(pack_objects.err);
230                                 pack_objects.err = -1;
231                         }
232                         else
233                                 goto fail;
234                         /* give priority to status messages */
235                         continue;
236                 }
237                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
238                         /* Data ready; we keep the last byte to ourselves
239                          * in case we detect broken rev-list, so that we
240                          * can leave the stream corrupted.  This is
241                          * unfortunate -- unpack-objects would happily
242                          * accept a valid packdata with trailing garbage,
243                          * so appending garbage after we pass all the
244                          * pack data is not good enough to signal
245                          * breakage to downstream.
246                          */
247                         char *cp = data;
248                         ssize_t outsz = 0;
249                         if (0 <= buffered) {
250                                 *cp++ = buffered;
251                                 outsz++;
252                         }
253                         sz = xread(pack_objects.out, cp,
254                                   sizeof(data) - outsz);
255                         if (0 < sz)
256                                 ;
257                         else if (sz == 0) {
258                                 close(pack_objects.out);
259                                 pack_objects.out = -1;
260                         }
261                         else
262                                 goto fail;
263                         sz += outsz;
264                         if (1 < sz) {
265                                 buffered = data[sz-1] & 0xFF;
266                                 sz--;
267                         }
268                         else
269                                 buffered = -1;
270                         send_client_data(1, data, sz);
271                 }
272
273                 /*
274                  * We hit the keepalive timeout without saying anything; send
275                  * an empty message on the data sideband just to let the other
276                  * side know we're still working on it, but don't have any data
277                  * yet.
278                  *
279                  * If we don't have a sideband channel, there's no room in the
280                  * protocol to say anything, so those clients are just out of
281                  * luck.
282                  */
283                 if (!ret && use_sideband) {
284                         static const char buf[] = "0005\1";
285                         write_or_die(1, buf, 5);
286                 }
287         }
288
289         if (finish_command(&pack_objects)) {
290                 error("git upload-pack: git-pack-objects died with error.");
291                 goto fail;
292         }
293
294         /* flush the data */
295         if (0 <= buffered) {
296                 data[0] = buffered;
297                 send_client_data(1, data, 1);
298                 fprintf(stderr, "flushed.\n");
299         }
300         if (use_sideband)
301                 packet_flush(1);
302         return;
303
304  fail:
305         send_client_data(3, abort_msg, sizeof(abort_msg));
306         die("git upload-pack: %s", abort_msg);
307 }
308
309 static int got_oid(const char *hex, struct object_id *oid,
310                    struct object_array *have_obj)
311 {
312         struct object *o;
313         int we_knew_they_have = 0;
314
315         if (get_oid_hex(hex, oid))
316                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
317         if (!has_object_file(oid))
318                 return -1;
319
320         o = parse_object(the_repository, oid);
321         if (!o)
322                 die("oops (%s)", oid_to_hex(oid));
323         if (o->type == OBJ_COMMIT) {
324                 struct commit_list *parents;
325                 struct commit *commit = (struct commit *)o;
326                 if (o->flags & THEY_HAVE)
327                         we_knew_they_have = 1;
328                 else
329                         o->flags |= THEY_HAVE;
330                 if (!oldest_have || (commit->date < oldest_have))
331                         oldest_have = commit->date;
332                 for (parents = commit->parents;
333                      parents;
334                      parents = parents->next)
335                         parents->item->object.flags |= THEY_HAVE;
336         }
337         if (!we_knew_they_have) {
338                 add_object_array(o, NULL, have_obj);
339                 return 1;
340         }
341         return 0;
342 }
343
344 static int ok_to_give_up(const struct object_array *have_obj,
345                          struct object_array *want_obj)
346 {
347         uint32_t min_generation = GENERATION_NUMBER_ZERO;
348
349         if (!have_obj->nr)
350                 return 0;
351
352         return can_all_from_reach_with_flag(want_obj, THEY_HAVE,
353                                             COMMON_KNOWN, oldest_have,
354                                             min_generation);
355 }
356
357 static int get_common_commits(struct packet_reader *reader,
358                               struct object_array *have_obj,
359                               struct object_array *want_obj)
360 {
361         struct object_id oid;
362         char last_hex[GIT_MAX_HEXSZ + 1];
363         int got_common = 0;
364         int got_other = 0;
365         int sent_ready = 0;
366
367         save_commit_buffer = 0;
368
369         for (;;) {
370                 const char *arg;
371
372                 reset_timeout();
373
374                 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
375                         if (multi_ack == 2 && got_common
376                             && !got_other && ok_to_give_up(have_obj, want_obj)) {
377                                 sent_ready = 1;
378                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
379                         }
380                         if (have_obj->nr == 0 || multi_ack)
381                                 packet_write_fmt(1, "NAK\n");
382
383                         if (no_done && sent_ready) {
384                                 packet_write_fmt(1, "ACK %s\n", last_hex);
385                                 return 0;
386                         }
387                         if (stateless_rpc)
388                                 exit(0);
389                         got_common = 0;
390                         got_other = 0;
391                         continue;
392                 }
393                 if (skip_prefix(reader->line, "have ", &arg)) {
394                         switch (got_oid(arg, &oid, have_obj)) {
395                         case -1: /* they have what we do not */
396                                 got_other = 1;
397                                 if (multi_ack && ok_to_give_up(have_obj, want_obj)) {
398                                         const char *hex = oid_to_hex(&oid);
399                                         if (multi_ack == 2) {
400                                                 sent_ready = 1;
401                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
402                                         } else
403                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
404                                 }
405                                 break;
406                         default:
407                                 got_common = 1;
408                                 oid_to_hex_r(last_hex, &oid);
409                                 if (multi_ack == 2)
410                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
411                                 else if (multi_ack)
412                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
413                                 else if (have_obj->nr == 1)
414                                         packet_write_fmt(1, "ACK %s\n", last_hex);
415                                 break;
416                         }
417                         continue;
418                 }
419                 if (!strcmp(reader->line, "done")) {
420                         if (have_obj->nr > 0) {
421                                 if (multi_ack)
422                                         packet_write_fmt(1, "ACK %s\n", last_hex);
423                                 return 0;
424                         }
425                         packet_write_fmt(1, "NAK\n");
426                         return -1;
427                 }
428                 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
429         }
430 }
431
432 static int is_our_ref(struct object *o)
433 {
434         int allow_hidden_ref = (allow_unadvertised_object_request &
435                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
436         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
437 }
438
439 /*
440  * on successful case, it's up to the caller to close cmd->out
441  */
442 static int do_reachable_revlist(struct child_process *cmd,
443                                 struct object_array *src,
444                                 struct object_array *reachable)
445 {
446         static const char *argv[] = {
447                 "rev-list", "--stdin", NULL,
448         };
449         struct object *o;
450         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
451         int i;
452         const unsigned hexsz = the_hash_algo->hexsz;
453
454         cmd->argv = argv;
455         cmd->git_cmd = 1;
456         cmd->no_stderr = 1;
457         cmd->in = -1;
458         cmd->out = -1;
459
460         /*
461          * If the next rev-list --stdin encounters an unknown commit,
462          * it terminates, which will cause SIGPIPE in the write loop
463          * below.
464          */
465         sigchain_push(SIGPIPE, SIG_IGN);
466
467         if (start_command(cmd))
468                 goto error;
469
470         namebuf[0] = '^';
471         namebuf[hexsz + 1] = '\n';
472         for (i = get_max_object_index(); 0 < i; ) {
473                 o = get_indexed_object(--i);
474                 if (!o)
475                         continue;
476                 if (reachable && o->type == OBJ_COMMIT)
477                         o->flags &= ~TMP_MARK;
478                 if (!is_our_ref(o))
479                         continue;
480                 memcpy(namebuf + 1, oid_to_hex(&o->oid), hexsz);
481                 if (write_in_full(cmd->in, namebuf, hexsz + 2) < 0)
482                         goto error;
483         }
484         namebuf[hexsz] = '\n';
485         for (i = 0; i < src->nr; i++) {
486                 o = src->objects[i].item;
487                 if (is_our_ref(o)) {
488                         if (reachable)
489                                 add_object_array(o, NULL, reachable);
490                         continue;
491                 }
492                 if (reachable && o->type == OBJ_COMMIT)
493                         o->flags |= TMP_MARK;
494                 memcpy(namebuf, oid_to_hex(&o->oid), hexsz);
495                 if (write_in_full(cmd->in, namebuf, hexsz + 1) < 0)
496                         goto error;
497         }
498         close(cmd->in);
499         cmd->in = -1;
500         sigchain_pop(SIGPIPE);
501
502         return 0;
503
504 error:
505         sigchain_pop(SIGPIPE);
506
507         if (cmd->in >= 0)
508                 close(cmd->in);
509         if (cmd->out >= 0)
510                 close(cmd->out);
511         return -1;
512 }
513
514 static int get_reachable_list(struct object_array *src,
515                               struct object_array *reachable)
516 {
517         struct child_process cmd = CHILD_PROCESS_INIT;
518         int i;
519         struct object *o;
520         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
521         const unsigned hexsz = the_hash_algo->hexsz;
522
523         if (do_reachable_revlist(&cmd, src, reachable) < 0)
524                 return -1;
525
526         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
527                 struct object_id sha1;
528                 const char *p;
529
530                 if (parse_oid_hex(namebuf, &sha1, &p) || *p != '\n')
531                         break;
532
533                 o = lookup_object(the_repository, sha1.hash);
534                 if (o && o->type == OBJ_COMMIT) {
535                         o->flags &= ~TMP_MARK;
536                 }
537         }
538         for (i = get_max_object_index(); 0 < i; i--) {
539                 o = get_indexed_object(i - 1);
540                 if (o && o->type == OBJ_COMMIT &&
541                     (o->flags & TMP_MARK)) {
542                         add_object_array(o, NULL, reachable);
543                                 o->flags &= ~TMP_MARK;
544                 }
545         }
546         close(cmd.out);
547
548         if (finish_command(&cmd))
549                 return -1;
550
551         return 0;
552 }
553
554 static int has_unreachable(struct object_array *src)
555 {
556         struct child_process cmd = CHILD_PROCESS_INIT;
557         char buf[1];
558         int i;
559
560         if (do_reachable_revlist(&cmd, src, NULL) < 0)
561                 return 1;
562
563         /*
564          * The commits out of the rev-list are not ancestors of
565          * our ref.
566          */
567         i = read_in_full(cmd.out, buf, 1);
568         if (i)
569                 goto error;
570         close(cmd.out);
571         cmd.out = -1;
572
573         /*
574          * rev-list may have died by encountering a bad commit
575          * in the history, in which case we do want to bail out
576          * even when it showed no commit.
577          */
578         if (finish_command(&cmd))
579                 goto error;
580
581         /* All the non-tip ones are ancestors of what we advertised */
582         return 0;
583
584 error:
585         sigchain_pop(SIGPIPE);
586         if (cmd.out >= 0)
587                 close(cmd.out);
588         return 1;
589 }
590
591 static void check_non_tip(struct object_array *want_obj)
592 {
593         int i;
594
595         /*
596          * In the normal in-process case without
597          * uploadpack.allowReachableSHA1InWant,
598          * non-tip requests can never happen.
599          */
600         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
601                 goto error;
602         if (!has_unreachable(want_obj))
603                 /* All the non-tip ones are ancestors of what we advertised */
604                 return;
605
606 error:
607         /* Pick one of them (we know there at least is one) */
608         for (i = 0; i < want_obj->nr; i++) {
609                 struct object *o = want_obj->objects[i].item;
610                 if (!is_our_ref(o))
611                         die("git upload-pack: not our ref %s",
612                             oid_to_hex(&o->oid));
613         }
614 }
615
616 static void send_shallow(struct packet_writer *writer,
617                          struct commit_list *result)
618 {
619         while (result) {
620                 struct object *object = &result->item->object;
621                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
622                         packet_writer_write(writer, "shallow %s",
623                                             oid_to_hex(&object->oid));
624                         register_shallow(the_repository, &object->oid);
625                         shallow_nr++;
626                 }
627                 result = result->next;
628         }
629 }
630
631 static void send_unshallow(struct packet_writer *writer,
632                            const struct object_array *shallows,
633                            struct object_array *want_obj)
634 {
635         int i;
636
637         for (i = 0; i < shallows->nr; i++) {
638                 struct object *object = shallows->objects[i].item;
639                 if (object->flags & NOT_SHALLOW) {
640                         struct commit_list *parents;
641                         packet_writer_write(writer, "unshallow %s",
642                                             oid_to_hex(&object->oid));
643                         object->flags &= ~CLIENT_SHALLOW;
644                         /*
645                          * We want to _register_ "object" as shallow, but we
646                          * also need to traverse object's parents to deepen a
647                          * shallow clone. Unregister it for now so we can
648                          * parse and add the parents to the want list, then
649                          * re-register it.
650                          */
651                         unregister_shallow(&object->oid);
652                         object->parsed = 0;
653                         parse_commit_or_die((struct commit *)object);
654                         parents = ((struct commit *)object)->parents;
655                         while (parents) {
656                                 add_object_array(&parents->item->object,
657                                                  NULL, want_obj);
658                                 parents = parents->next;
659                         }
660                         add_object_array(object, NULL, &extra_edge_obj);
661                 }
662                 /* make sure commit traversal conforms to client */
663                 register_shallow(the_repository, &object->oid);
664         }
665 }
666
667 static void deepen(struct packet_writer *writer, int depth, int deepen_relative,
668                    struct object_array *shallows, struct object_array *want_obj)
669 {
670         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
671                 int i;
672
673                 for (i = 0; i < shallows->nr; i++) {
674                         struct object *object = shallows->objects[i].item;
675                         object->flags |= NOT_SHALLOW;
676                 }
677         } else if (deepen_relative) {
678                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
679                 struct commit_list *result;
680
681                 get_reachable_list(shallows, &reachable_shallows);
682                 result = get_shallow_commits(&reachable_shallows,
683                                              depth + 1,
684                                              SHALLOW, NOT_SHALLOW);
685                 send_shallow(writer, result);
686                 free_commit_list(result);
687                 object_array_clear(&reachable_shallows);
688         } else {
689                 struct commit_list *result;
690
691                 result = get_shallow_commits(want_obj, depth,
692                                              SHALLOW, NOT_SHALLOW);
693                 send_shallow(writer, result);
694                 free_commit_list(result);
695         }
696
697         send_unshallow(writer, shallows, want_obj);
698 }
699
700 static void deepen_by_rev_list(struct packet_writer *writer, int ac,
701                                const char **av,
702                                struct object_array *shallows,
703                                struct object_array *want_obj)
704 {
705         struct commit_list *result;
706
707         close_commit_graph(the_repository);
708         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
709         send_shallow(writer, result);
710         free_commit_list(result);
711         send_unshallow(writer, shallows, want_obj);
712 }
713
714 /* Returns 1 if a shallow list is sent or 0 otherwise */
715 static int send_shallow_list(struct packet_writer *writer,
716                              int depth, int deepen_rev_list,
717                              timestamp_t deepen_since,
718                              struct string_list *deepen_not,
719                              struct object_array *shallows,
720                              struct object_array *want_obj)
721 {
722         int ret = 0;
723
724         if (depth > 0 && deepen_rev_list)
725                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
726         if (depth > 0) {
727                 deepen(writer, depth, deepen_relative, shallows, want_obj);
728                 ret = 1;
729         } else if (deepen_rev_list) {
730                 struct argv_array av = ARGV_ARRAY_INIT;
731                 int i;
732
733                 argv_array_push(&av, "rev-list");
734                 if (deepen_since)
735                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
736                 if (deepen_not->nr) {
737                         argv_array_push(&av, "--not");
738                         for (i = 0; i < deepen_not->nr; i++) {
739                                 struct string_list_item *s = deepen_not->items + i;
740                                 argv_array_push(&av, s->string);
741                         }
742                         argv_array_push(&av, "--not");
743                 }
744                 for (i = 0; i < want_obj->nr; i++) {
745                         struct object *o = want_obj->objects[i].item;
746                         argv_array_push(&av, oid_to_hex(&o->oid));
747                 }
748                 deepen_by_rev_list(writer, av.argc, av.argv, shallows, want_obj);
749                 argv_array_clear(&av);
750                 ret = 1;
751         } else {
752                 if (shallows->nr > 0) {
753                         int i;
754                         for (i = 0; i < shallows->nr; i++)
755                                 register_shallow(the_repository,
756                                                  &shallows->objects[i].item->oid);
757                 }
758         }
759
760         shallow_nr += shallows->nr;
761         return ret;
762 }
763
764 static int process_shallow(const char *line, struct object_array *shallows)
765 {
766         const char *arg;
767         if (skip_prefix(line, "shallow ", &arg)) {
768                 struct object_id oid;
769                 struct object *object;
770                 if (get_oid_hex(arg, &oid))
771                         die("invalid shallow line: %s", line);
772                 object = parse_object(the_repository, &oid);
773                 if (!object)
774                         return 1;
775                 if (object->type != OBJ_COMMIT)
776                         die("invalid shallow object %s", oid_to_hex(&oid));
777                 if (!(object->flags & CLIENT_SHALLOW)) {
778                         object->flags |= CLIENT_SHALLOW;
779                         add_object_array(object, NULL, shallows);
780                 }
781                 return 1;
782         }
783
784         return 0;
785 }
786
787 static int process_deepen(const char *line, int *depth)
788 {
789         const char *arg;
790         if (skip_prefix(line, "deepen ", &arg)) {
791                 char *end = NULL;
792                 *depth = (int)strtol(arg, &end, 0);
793                 if (!end || *end || *depth <= 0)
794                         die("Invalid deepen: %s", line);
795                 return 1;
796         }
797
798         return 0;
799 }
800
801 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
802 {
803         const char *arg;
804         if (skip_prefix(line, "deepen-since ", &arg)) {
805                 char *end = NULL;
806                 *deepen_since = parse_timestamp(arg, &end, 0);
807                 if (!end || *end || !deepen_since ||
808                     /* revisions.c's max_age -1 is special */
809                     *deepen_since == -1)
810                         die("Invalid deepen-since: %s", line);
811                 *deepen_rev_list = 1;
812                 return 1;
813         }
814         return 0;
815 }
816
817 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
818 {
819         const char *arg;
820         if (skip_prefix(line, "deepen-not ", &arg)) {
821                 char *ref = NULL;
822                 struct object_id oid;
823                 if (expand_ref(arg, strlen(arg), &oid, &ref) != 1)
824                         die("git upload-pack: ambiguous deepen-not: %s", line);
825                 string_list_append(deepen_not, ref);
826                 free(ref);
827                 *deepen_rev_list = 1;
828                 return 1;
829         }
830         return 0;
831 }
832
833 static void receive_needs(struct packet_reader *reader, struct object_array *want_obj)
834 {
835         struct object_array shallows = OBJECT_ARRAY_INIT;
836         struct string_list deepen_not = STRING_LIST_INIT_DUP;
837         int depth = 0;
838         int has_non_tip = 0;
839         timestamp_t deepen_since = 0;
840         int deepen_rev_list = 0;
841         struct packet_writer writer;
842
843         shallow_nr = 0;
844         packet_writer_init(&writer, 1);
845         for (;;) {
846                 struct object *o;
847                 const char *features;
848                 struct object_id oid_buf;
849                 const char *arg;
850
851                 reset_timeout();
852                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
853                         break;
854
855                 if (process_shallow(reader->line, &shallows))
856                         continue;
857                 if (process_deepen(reader->line, &depth))
858                         continue;
859                 if (process_deepen_since(reader->line, &deepen_since, &deepen_rev_list))
860                         continue;
861                 if (process_deepen_not(reader->line, &deepen_not, &deepen_rev_list))
862                         continue;
863
864                 if (skip_prefix(reader->line, "filter ", &arg)) {
865                         if (!filter_capability_requested)
866                                 die("git upload-pack: filtering capability not negotiated");
867                         parse_list_objects_filter(&filter_options, arg);
868                         continue;
869                 }
870
871                 if (!skip_prefix(reader->line, "want ", &arg) ||
872                     parse_oid_hex(arg, &oid_buf, &features))
873                         die("git upload-pack: protocol error, "
874                             "expected to get object ID, not '%s'", reader->line);
875
876                 if (parse_feature_request(features, "deepen-relative"))
877                         deepen_relative = 1;
878                 if (parse_feature_request(features, "multi_ack_detailed"))
879                         multi_ack = 2;
880                 else if (parse_feature_request(features, "multi_ack"))
881                         multi_ack = 1;
882                 if (parse_feature_request(features, "no-done"))
883                         no_done = 1;
884                 if (parse_feature_request(features, "thin-pack"))
885                         use_thin_pack = 1;
886                 if (parse_feature_request(features, "ofs-delta"))
887                         use_ofs_delta = 1;
888                 if (parse_feature_request(features, "side-band-64k"))
889                         use_sideband = LARGE_PACKET_MAX;
890                 else if (parse_feature_request(features, "side-band"))
891                         use_sideband = DEFAULT_PACKET_MAX;
892                 if (parse_feature_request(features, "no-progress"))
893                         no_progress = 1;
894                 if (parse_feature_request(features, "include-tag"))
895                         use_include_tag = 1;
896                 if (allow_filter && parse_feature_request(features, "filter"))
897                         filter_capability_requested = 1;
898
899                 o = parse_object(the_repository, &oid_buf);
900                 if (!o) {
901                         packet_writer_error(&writer,
902                                             "upload-pack: not our ref %s",
903                                             oid_to_hex(&oid_buf));
904                         die("git upload-pack: not our ref %s",
905                             oid_to_hex(&oid_buf));
906                 }
907                 if (!(o->flags & WANTED)) {
908                         o->flags |= WANTED;
909                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
910                               || is_our_ref(o)))
911                                 has_non_tip = 1;
912                         add_object_array(o, NULL, want_obj);
913                 }
914         }
915
916         /*
917          * We have sent all our refs already, and the other end
918          * should have chosen out of them. When we are operating
919          * in the stateless RPC mode, however, their choice may
920          * have been based on the set of older refs advertised
921          * by another process that handled the initial request.
922          */
923         if (has_non_tip)
924                 check_non_tip(want_obj);
925
926         if (!use_sideband && daemon_mode)
927                 no_progress = 1;
928
929         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
930                 return;
931
932         if (send_shallow_list(&writer, depth, deepen_rev_list, deepen_since,
933                               &deepen_not, &shallows, want_obj))
934                 packet_flush(1);
935         object_array_clear(&shallows);
936 }
937
938 /* return non-zero if the ref is hidden, otherwise 0 */
939 static int mark_our_ref(const char *refname, const char *refname_full,
940                         const struct object_id *oid)
941 {
942         struct object *o = lookup_unknown_object(oid->hash);
943
944         if (ref_is_hidden(refname, refname_full)) {
945                 o->flags |= HIDDEN_REF;
946                 return 1;
947         }
948         o->flags |= OUR_REF;
949         return 0;
950 }
951
952 static int check_ref(const char *refname_full, const struct object_id *oid,
953                      int flag, void *cb_data)
954 {
955         const char *refname = strip_namespace(refname_full);
956
957         mark_our_ref(refname, refname_full, oid);
958         return 0;
959 }
960
961 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
962 {
963         struct string_list_item *item;
964
965         if (!symref->nr)
966                 return;
967         for_each_string_list_item(item, symref)
968                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
969 }
970
971 static int send_ref(const char *refname, const struct object_id *oid,
972                     int flag, void *cb_data)
973 {
974         static const char *capabilities = "multi_ack thin-pack side-band"
975                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
976                 " deepen-relative no-progress include-tag multi_ack_detailed";
977         const char *refname_nons = strip_namespace(refname);
978         struct object_id peeled;
979
980         if (mark_our_ref(refname_nons, refname, oid))
981                 return 0;
982
983         if (capabilities) {
984                 struct strbuf symref_info = STRBUF_INIT;
985
986                 format_symref_info(&symref_info, cb_data);
987                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
988                              oid_to_hex(oid), refname_nons,
989                              0, capabilities,
990                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
991                                      " allow-tip-sha1-in-want" : "",
992                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
993                                      " allow-reachable-sha1-in-want" : "",
994                              stateless_rpc ? " no-done" : "",
995                              symref_info.buf,
996                              allow_filter ? " filter" : "",
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 }
1007
1008 static 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
1014         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 }
1023
1024 static 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 (!strcmp("uploadpack.allowfilter", var)) {
1046                 allow_filter = git_config_bool(var, value);
1047         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1048                 allow_ref_in_want = git_config_bool(var, value);
1049         }
1050
1051         if (current_config_scope() != CONFIG_SCOPE_REPO) {
1052                 if (!strcmp("uploadpack.packobjectshook", var))
1053                         return git_config_string(&pack_objects_hook, var, value);
1054         }
1055
1056         return parse_hide_refs_config(var, value, "uploadpack");
1057 }
1058
1059 void upload_pack(struct upload_pack_options *options)
1060 {
1061         struct string_list symref = STRING_LIST_INIT_DUP;
1062         struct object_array want_obj = OBJECT_ARRAY_INIT;
1063         struct packet_reader reader;
1064
1065         stateless_rpc = options->stateless_rpc;
1066         timeout = options->timeout;
1067         daemon_mode = options->daemon_mode;
1068
1069         git_config(upload_pack_config, NULL);
1070
1071         head_ref_namespaced(find_symref, &symref);
1072
1073         if (options->advertise_refs || !stateless_rpc) {
1074                 reset_timeout();
1075                 head_ref_namespaced(send_ref, &symref);
1076                 for_each_namespaced_ref(send_ref, &symref);
1077                 advertise_shallow_grafts(1);
1078                 packet_flush(1);
1079         } else {
1080                 head_ref_namespaced(check_ref, NULL);
1081                 for_each_namespaced_ref(check_ref, NULL);
1082         }
1083         string_list_clear(&symref, 1);
1084         if (options->advertise_refs)
1085                 return;
1086
1087         packet_reader_init(&reader, 0, NULL, 0,
1088                            PACKET_READ_CHOMP_NEWLINE |
1089                            PACKET_READ_DIE_ON_ERR_PACKET);
1090
1091         receive_needs(&reader, &want_obj);
1092         if (want_obj.nr) {
1093                 struct object_array have_obj = OBJECT_ARRAY_INIT;
1094                 get_common_commits(&reader, &have_obj, &want_obj);
1095                 create_pack_file(&have_obj, &want_obj);
1096         }
1097 }
1098
1099 struct upload_pack_data {
1100         struct object_array wants;
1101         struct string_list wanted_refs;
1102         struct oid_array haves;
1103
1104         struct object_array shallows;
1105         struct string_list deepen_not;
1106         int depth;
1107         timestamp_t deepen_since;
1108         int deepen_rev_list;
1109         int deepen_relative;
1110
1111         struct packet_writer writer;
1112
1113         unsigned stateless_rpc : 1;
1114
1115         unsigned use_thin_pack : 1;
1116         unsigned use_ofs_delta : 1;
1117         unsigned no_progress : 1;
1118         unsigned use_include_tag : 1;
1119         unsigned done : 1;
1120 };
1121
1122 static void upload_pack_data_init(struct upload_pack_data *data)
1123 {
1124         struct object_array wants = OBJECT_ARRAY_INIT;
1125         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
1126         struct oid_array haves = OID_ARRAY_INIT;
1127         struct object_array shallows = OBJECT_ARRAY_INIT;
1128         struct string_list deepen_not = STRING_LIST_INIT_DUP;
1129
1130         memset(data, 0, sizeof(*data));
1131         data->wants = wants;
1132         data->wanted_refs = wanted_refs;
1133         data->haves = haves;
1134         data->shallows = shallows;
1135         data->deepen_not = deepen_not;
1136         packet_writer_init(&data->writer, 1);
1137 }
1138
1139 static void upload_pack_data_clear(struct upload_pack_data *data)
1140 {
1141         object_array_clear(&data->wants);
1142         string_list_clear(&data->wanted_refs, 1);
1143         oid_array_clear(&data->haves);
1144         object_array_clear(&data->shallows);
1145         string_list_clear(&data->deepen_not, 0);
1146 }
1147
1148 static int parse_want(struct packet_writer *writer, const char *line,
1149                       struct object_array *want_obj)
1150 {
1151         const char *arg;
1152         if (skip_prefix(line, "want ", &arg)) {
1153                 struct object_id oid;
1154                 struct object *o;
1155
1156                 if (get_oid_hex(arg, &oid))
1157                         die("git upload-pack: protocol error, "
1158                             "expected to get oid, not '%s'", line);
1159
1160                 o = parse_object(the_repository, &oid);
1161                 if (!o) {
1162                         packet_writer_error(writer,
1163                                             "upload-pack: not our ref %s",
1164                                             oid_to_hex(&oid));
1165                         die("git upload-pack: not our ref %s",
1166                             oid_to_hex(&oid));
1167                 }
1168
1169                 if (!(o->flags & WANTED)) {
1170                         o->flags |= WANTED;
1171                         add_object_array(o, NULL, want_obj);
1172                 }
1173
1174                 return 1;
1175         }
1176
1177         return 0;
1178 }
1179
1180 static int parse_want_ref(struct packet_writer *writer, const char *line,
1181                           struct string_list *wanted_refs,
1182                           struct object_array *want_obj)
1183 {
1184         const char *arg;
1185         if (skip_prefix(line, "want-ref ", &arg)) {
1186                 struct object_id oid;
1187                 struct string_list_item *item;
1188                 struct object *o;
1189
1190                 if (read_ref(arg, &oid)) {
1191                         packet_writer_error(writer, "unknown ref %s", arg);
1192                         die("unknown ref %s", arg);
1193                 }
1194
1195                 item = string_list_append(wanted_refs, arg);
1196                 item->util = oiddup(&oid);
1197
1198                 o = parse_object_or_die(&oid, arg);
1199                 if (!(o->flags & WANTED)) {
1200                         o->flags |= WANTED;
1201                         add_object_array(o, NULL, want_obj);
1202                 }
1203
1204                 return 1;
1205         }
1206
1207         return 0;
1208 }
1209
1210 static int parse_have(const char *line, struct oid_array *haves)
1211 {
1212         const char *arg;
1213         if (skip_prefix(line, "have ", &arg)) {
1214                 struct object_id oid;
1215
1216                 if (get_oid_hex(arg, &oid))
1217                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1218                 oid_array_append(haves, &oid);
1219                 return 1;
1220         }
1221
1222         return 0;
1223 }
1224
1225 static void process_args(struct packet_reader *request,
1226                          struct upload_pack_data *data,
1227                          struct object_array *want_obj)
1228 {
1229         while (packet_reader_read(request) != PACKET_READ_FLUSH) {
1230                 const char *arg = request->line;
1231                 const char *p;
1232
1233                 /* process want */
1234                 if (parse_want(&data->writer, arg, want_obj))
1235                         continue;
1236                 if (allow_ref_in_want &&
1237                     parse_want_ref(&data->writer, arg, &data->wanted_refs,
1238                                    want_obj))
1239                         continue;
1240                 /* process have line */
1241                 if (parse_have(arg, &data->haves))
1242                         continue;
1243
1244                 /* process args like thin-pack */
1245                 if (!strcmp(arg, "thin-pack")) {
1246                         use_thin_pack = 1;
1247                         continue;
1248                 }
1249                 if (!strcmp(arg, "ofs-delta")) {
1250                         use_ofs_delta = 1;
1251                         continue;
1252                 }
1253                 if (!strcmp(arg, "no-progress")) {
1254                         no_progress = 1;
1255                         continue;
1256                 }
1257                 if (!strcmp(arg, "include-tag")) {
1258                         use_include_tag = 1;
1259                         continue;
1260                 }
1261                 if (!strcmp(arg, "done")) {
1262                         data->done = 1;
1263                         continue;
1264                 }
1265
1266                 /* Shallow related arguments */
1267                 if (process_shallow(arg, &data->shallows))
1268                         continue;
1269                 if (process_deepen(arg, &data->depth))
1270                         continue;
1271                 if (process_deepen_since(arg, &data->deepen_since,
1272                                          &data->deepen_rev_list))
1273                         continue;
1274                 if (process_deepen_not(arg, &data->deepen_not,
1275                                        &data->deepen_rev_list))
1276                         continue;
1277                 if (!strcmp(arg, "deepen-relative")) {
1278                         data->deepen_relative = 1;
1279                         continue;
1280                 }
1281
1282                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1283                         parse_list_objects_filter(&filter_options, p);
1284                         continue;
1285                 }
1286
1287                 /* ignore unknown lines maybe? */
1288                 die("unexpected line: '%s'", arg);
1289         }
1290 }
1291
1292 static int process_haves(struct oid_array *haves, struct oid_array *common,
1293                          struct object_array *have_obj)
1294 {
1295         int i;
1296
1297         /* Process haves */
1298         for (i = 0; i < haves->nr; i++) {
1299                 const struct object_id *oid = &haves->oid[i];
1300                 struct object *o;
1301                 int we_knew_they_have = 0;
1302
1303                 if (!has_object_file(oid))
1304                         continue;
1305
1306                 oid_array_append(common, oid);
1307
1308                 o = parse_object(the_repository, oid);
1309                 if (!o)
1310                         die("oops (%s)", oid_to_hex(oid));
1311                 if (o->type == OBJ_COMMIT) {
1312                         struct commit_list *parents;
1313                         struct commit *commit = (struct commit *)o;
1314                         if (o->flags & THEY_HAVE)
1315                                 we_knew_they_have = 1;
1316                         else
1317                                 o->flags |= THEY_HAVE;
1318                         if (!oldest_have || (commit->date < oldest_have))
1319                                 oldest_have = commit->date;
1320                         for (parents = commit->parents;
1321                              parents;
1322                              parents = parents->next)
1323                                 parents->item->object.flags |= THEY_HAVE;
1324                 }
1325                 if (!we_knew_they_have)
1326                         add_object_array(o, NULL, have_obj);
1327         }
1328
1329         return 0;
1330 }
1331
1332 static int send_acks(struct packet_writer *writer, struct oid_array *acks,
1333                      const struct object_array *have_obj,
1334                      struct object_array *want_obj)
1335 {
1336         int i;
1337
1338         packet_writer_write(writer, "acknowledgments\n");
1339
1340         /* Send Acks */
1341         if (!acks->nr)
1342                 packet_writer_write(writer, "NAK\n");
1343
1344         for (i = 0; i < acks->nr; i++) {
1345                 packet_writer_write(writer, "ACK %s\n",
1346                                     oid_to_hex(&acks->oid[i]));
1347         }
1348
1349         if (ok_to_give_up(have_obj, want_obj)) {
1350                 /* Send Ready */
1351                 packet_writer_write(writer, "ready\n");
1352                 return 1;
1353         }
1354
1355         return 0;
1356 }
1357
1358 static int process_haves_and_send_acks(struct upload_pack_data *data,
1359                                        struct object_array *have_obj,
1360                                        struct object_array *want_obj)
1361 {
1362         struct oid_array common = OID_ARRAY_INIT;
1363         int ret = 0;
1364
1365         process_haves(&data->haves, &common, have_obj);
1366         if (data->done) {
1367                 ret = 1;
1368         } else if (send_acks(&data->writer, &common, have_obj, want_obj)) {
1369                 packet_writer_delim(&data->writer);
1370                 ret = 1;
1371         } else {
1372                 /* Add Flush */
1373                 packet_writer_flush(&data->writer);
1374                 ret = 0;
1375         }
1376
1377         oid_array_clear(&data->haves);
1378         oid_array_clear(&common);
1379         return ret;
1380 }
1381
1382 static void send_wanted_ref_info(struct upload_pack_data *data)
1383 {
1384         const struct string_list_item *item;
1385
1386         if (!data->wanted_refs.nr)
1387                 return;
1388
1389         packet_writer_write(&data->writer, "wanted-refs\n");
1390
1391         for_each_string_list_item(item, &data->wanted_refs) {
1392                 packet_writer_write(&data->writer, "%s %s\n",
1393                                     oid_to_hex(item->util),
1394                                     item->string);
1395         }
1396
1397         packet_writer_delim(&data->writer);
1398 }
1399
1400 static void send_shallow_info(struct upload_pack_data *data,
1401                               struct object_array *want_obj)
1402 {
1403         /* No shallow info needs to be sent */
1404         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1405             !is_repository_shallow(the_repository))
1406                 return;
1407
1408         packet_writer_write(&data->writer, "shallow-info\n");
1409
1410         if (!send_shallow_list(&data->writer, data->depth,
1411                                data->deepen_rev_list,
1412                                data->deepen_since, &data->deepen_not,
1413                                &data->shallows, want_obj) &&
1414             is_repository_shallow(the_repository))
1415                 deepen(&data->writer, INFINITE_DEPTH, data->deepen_relative,
1416                        &data->shallows, want_obj);
1417
1418         packet_delim(1);
1419 }
1420
1421 enum fetch_state {
1422         FETCH_PROCESS_ARGS = 0,
1423         FETCH_SEND_ACKS,
1424         FETCH_SEND_PACK,
1425         FETCH_DONE,
1426 };
1427
1428 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1429                    struct packet_reader *request)
1430 {
1431         enum fetch_state state = FETCH_PROCESS_ARGS;
1432         struct upload_pack_data data;
1433         struct object_array have_obj = OBJECT_ARRAY_INIT;
1434         struct object_array want_obj = OBJECT_ARRAY_INIT;
1435
1436         clear_object_flags(ALL_FLAGS);
1437
1438         git_config(upload_pack_config, NULL);
1439
1440         upload_pack_data_init(&data);
1441         use_sideband = LARGE_PACKET_MAX;
1442
1443         while (state != FETCH_DONE) {
1444                 switch (state) {
1445                 case FETCH_PROCESS_ARGS:
1446                         process_args(request, &data, &want_obj);
1447
1448                         if (!want_obj.nr) {
1449                                 /*
1450                                  * Request didn't contain any 'want' lines,
1451                                  * guess they didn't want anything.
1452                                  */
1453                                 state = FETCH_DONE;
1454                         } else if (data.haves.nr) {
1455                                 /*
1456                                  * Request had 'have' lines, so lets ACK them.
1457                                  */
1458                                 state = FETCH_SEND_ACKS;
1459                         } else {
1460                                 /*
1461                                  * Request had 'want's but no 'have's so we can
1462                                  * immedietly go to construct and send a pack.
1463                                  */
1464                                 state = FETCH_SEND_PACK;
1465                         }
1466                         break;
1467                 case FETCH_SEND_ACKS:
1468                         if (process_haves_and_send_acks(&data, &have_obj,
1469                                                         &want_obj))
1470                                 state = FETCH_SEND_PACK;
1471                         else
1472                                 state = FETCH_DONE;
1473                         break;
1474                 case FETCH_SEND_PACK:
1475                         send_wanted_ref_info(&data);
1476                         send_shallow_info(&data, &want_obj);
1477
1478                         packet_writer_write(&data.writer, "packfile\n");
1479                         create_pack_file(&have_obj, &want_obj);
1480                         state = FETCH_DONE;
1481                         break;
1482                 case FETCH_DONE:
1483                         continue;
1484                 }
1485         }
1486
1487         upload_pack_data_clear(&data);
1488         object_array_clear(&have_obj);
1489         object_array_clear(&want_obj);
1490         return 0;
1491 }
1492
1493 int upload_pack_advertise(struct repository *r,
1494                           struct strbuf *value)
1495 {
1496         if (value) {
1497                 int allow_filter_value;
1498                 int allow_ref_in_want;
1499
1500                 strbuf_addstr(value, "shallow");
1501
1502                 if (!repo_config_get_bool(the_repository,
1503                                          "uploadpack.allowfilter",
1504                                          &allow_filter_value) &&
1505                     allow_filter_value)
1506                         strbuf_addstr(value, " filter");
1507
1508                 if (!repo_config_get_bool(the_repository,
1509                                          "uploadpack.allowrefinwant",
1510                                          &allow_ref_in_want) &&
1511                     allow_ref_in_want)
1512                         strbuf_addstr(value, " ref-in-want");
1513         }
1514
1515         return 1;
1516 }