Sync 'ds/multi-pack-index' to v2.19.0-rc0
[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
28 /* Remember to update object flag allocation in object.h */
29 #define THEY_HAVE       (1u << 11)
30 #define OUR_REF         (1u << 12)
31 #define WANTED          (1u << 13)
32 #define COMMON_KNOWN    (1u << 14)
33 #define REACHABLE       (1u << 15)
34
35 #define SHALLOW         (1u << 16)
36 #define NOT_SHALLOW     (1u << 17)
37 #define CLIENT_SHALLOW  (1u << 18)
38 #define HIDDEN_REF      (1u << 19)
39
40 static timestamp_t oldest_have;
41
42 static int deepen_relative;
43 static int multi_ack;
44 static int no_done;
45 static int use_thin_pack, use_ofs_delta, use_include_tag;
46 static int no_progress, daemon_mode;
47 /* Allow specifying sha1 if it is a ref tip. */
48 #define ALLOW_TIP_SHA1  01
49 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
50 #define ALLOW_REACHABLE_SHA1    02
51 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
52 #define ALLOW_ANY_SHA1  07
53 static unsigned int allow_unadvertised_object_request;
54 static int shallow_nr;
55 static struct object_array have_obj;
56 static struct object_array want_obj;
57 static struct object_array extra_edge_obj;
58 static unsigned int timeout;
59 static int keepalive = 5;
60 /* 0 for no sideband,
61  * otherwise maximum packet size (up to 65520 bytes).
62  */
63 static int use_sideband;
64 static int stateless_rpc;
65 static const char *pack_objects_hook;
66
67 static int filter_capability_requested;
68 static int allow_filter;
69 static int allow_ref_in_want;
70 static struct list_objects_filter_options filter_options;
71
72 static void reset_timeout(void)
73 {
74         alarm(timeout);
75 }
76
77 static void send_client_data(int fd, const char *data, ssize_t sz)
78 {
79         if (use_sideband) {
80                 send_sideband(1, fd, data, sz, use_sideband);
81                 return;
82         }
83         if (fd == 3)
84                 /* emergency quit */
85                 fd = 2;
86         if (fd == 2) {
87                 /* XXX: are we happy to lose stuff here? */
88                 xwrite(fd, data, sz);
89                 return;
90         }
91         write_or_die(fd, data, sz);
92 }
93
94 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
95 {
96         FILE *fp = cb_data;
97         if (graft->nr_parent == -1)
98                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
99         return 0;
100 }
101
102 static void create_pack_file(void)
103 {
104         struct child_process pack_objects = CHILD_PROCESS_INIT;
105         char data[8193], progress[128];
106         char abort_msg[] = "aborting due to possible repository "
107                 "corruption on the remote side.";
108         int buffered = -1;
109         ssize_t sz;
110         int i;
111         FILE *pipe_fd;
112
113         if (!pack_objects_hook)
114                 pack_objects.git_cmd = 1;
115         else {
116                 argv_array_push(&pack_objects.args, pack_objects_hook);
117                 argv_array_push(&pack_objects.args, "git");
118                 pack_objects.use_shell = 1;
119         }
120
121         if (shallow_nr) {
122                 argv_array_push(&pack_objects.args, "--shallow-file");
123                 argv_array_push(&pack_objects.args, "");
124         }
125         argv_array_push(&pack_objects.args, "pack-objects");
126         argv_array_push(&pack_objects.args, "--revs");
127         if (use_thin_pack)
128                 argv_array_push(&pack_objects.args, "--thin");
129
130         argv_array_push(&pack_objects.args, "--stdout");
131         if (shallow_nr)
132                 argv_array_push(&pack_objects.args, "--shallow");
133         if (!no_progress)
134                 argv_array_push(&pack_objects.args, "--progress");
135         if (use_ofs_delta)
136                 argv_array_push(&pack_objects.args, "--delta-base-offset");
137         if (use_include_tag)
138                 argv_array_push(&pack_objects.args, "--include-tag");
139         if (filter_options.filter_spec) {
140                 if (pack_objects.use_shell) {
141                         struct strbuf buf = STRBUF_INIT;
142                         sq_quote_buf(&buf, filter_options.filter_spec);
143                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
144                         strbuf_release(&buf);
145                 } else {
146                         argv_array_pushf(&pack_objects.args, "--filter=%s",
147                                          filter_options.filter_spec);
148                 }
149         }
150
151         pack_objects.in = -1;
152         pack_objects.out = -1;
153         pack_objects.err = -1;
154
155         if (start_command(&pack_objects))
156                 die("git upload-pack: unable to fork git-pack-objects");
157
158         pipe_fd = xfdopen(pack_objects.in, "w");
159
160         if (shallow_nr)
161                 for_each_commit_graft(write_one_shallow, pipe_fd);
162
163         for (i = 0; i < want_obj.nr; i++)
164                 fprintf(pipe_fd, "%s\n",
165                         oid_to_hex(&want_obj.objects[i].item->oid));
166         fprintf(pipe_fd, "--not\n");
167         for (i = 0; i < have_obj.nr; i++)
168                 fprintf(pipe_fd, "%s\n",
169                         oid_to_hex(&have_obj.objects[i].item->oid));
170         for (i = 0; i < extra_edge_obj.nr; i++)
171                 fprintf(pipe_fd, "%s\n",
172                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
173         fprintf(pipe_fd, "\n");
174         fflush(pipe_fd);
175         fclose(pipe_fd);
176
177         /* We read from pack_objects.err to capture stderr output for
178          * progress bar, and pack_objects.out to capture the pack data.
179          */
180
181         while (1) {
182                 struct pollfd pfd[2];
183                 int pe, pu, pollsize;
184                 int ret;
185
186                 reset_timeout();
187
188                 pollsize = 0;
189                 pe = pu = -1;
190
191                 if (0 <= pack_objects.out) {
192                         pfd[pollsize].fd = pack_objects.out;
193                         pfd[pollsize].events = POLLIN;
194                         pu = pollsize;
195                         pollsize++;
196                 }
197                 if (0 <= pack_objects.err) {
198                         pfd[pollsize].fd = pack_objects.err;
199                         pfd[pollsize].events = POLLIN;
200                         pe = pollsize;
201                         pollsize++;
202                 }
203
204                 if (!pollsize)
205                         break;
206
207                 ret = poll(pfd, pollsize,
208                         keepalive < 0 ? -1 : 1000 * keepalive);
209
210                 if (ret < 0) {
211                         if (errno != EINTR) {
212                                 error_errno("poll failed, resuming");
213                                 sleep(1);
214                         }
215                         continue;
216                 }
217                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
218                         /* Status ready; we ship that in the side-band
219                          * or dump to the standard error.
220                          */
221                         sz = xread(pack_objects.err, progress,
222                                   sizeof(progress));
223                         if (0 < sz)
224                                 send_client_data(2, progress, sz);
225                         else if (sz == 0) {
226                                 close(pack_objects.err);
227                                 pack_objects.err = -1;
228                         }
229                         else
230                                 goto fail;
231                         /* give priority to status messages */
232                         continue;
233                 }
234                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
235                         /* Data ready; we keep the last byte to ourselves
236                          * in case we detect broken rev-list, so that we
237                          * can leave the stream corrupted.  This is
238                          * unfortunate -- unpack-objects would happily
239                          * accept a valid packdata with trailing garbage,
240                          * so appending garbage after we pass all the
241                          * pack data is not good enough to signal
242                          * breakage to downstream.
243                          */
244                         char *cp = data;
245                         ssize_t outsz = 0;
246                         if (0 <= buffered) {
247                                 *cp++ = buffered;
248                                 outsz++;
249                         }
250                         sz = xread(pack_objects.out, cp,
251                                   sizeof(data) - outsz);
252                         if (0 < sz)
253                                 ;
254                         else if (sz == 0) {
255                                 close(pack_objects.out);
256                                 pack_objects.out = -1;
257                         }
258                         else
259                                 goto fail;
260                         sz += outsz;
261                         if (1 < sz) {
262                                 buffered = data[sz-1] & 0xFF;
263                                 sz--;
264                         }
265                         else
266                                 buffered = -1;
267                         send_client_data(1, data, sz);
268                 }
269
270                 /*
271                  * We hit the keepalive timeout without saying anything; send
272                  * an empty message on the data sideband just to let the other
273                  * side know we're still working on it, but don't have any data
274                  * yet.
275                  *
276                  * If we don't have a sideband channel, there's no room in the
277                  * protocol to say anything, so those clients are just out of
278                  * luck.
279                  */
280                 if (!ret && use_sideband) {
281                         static const char buf[] = "0005\1";
282                         write_or_die(1, buf, 5);
283                 }
284         }
285
286         if (finish_command(&pack_objects)) {
287                 error("git upload-pack: git-pack-objects died with error.");
288                 goto fail;
289         }
290
291         /* flush the data */
292         if (0 <= buffered) {
293                 data[0] = buffered;
294                 send_client_data(1, data, 1);
295                 fprintf(stderr, "flushed.\n");
296         }
297         if (use_sideband)
298                 packet_flush(1);
299         return;
300
301  fail:
302         send_client_data(3, abort_msg, sizeof(abort_msg));
303         die("git upload-pack: %s", abort_msg);
304 }
305
306 static int got_oid(const char *hex, struct object_id *oid)
307 {
308         struct object *o;
309         int we_knew_they_have = 0;
310
311         if (get_oid_hex(hex, oid))
312                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
313         if (!has_object_file(oid))
314                 return -1;
315
316         o = parse_object(the_repository, oid);
317         if (!o)
318                 die("oops (%s)", oid_to_hex(oid));
319         if (o->type == OBJ_COMMIT) {
320                 struct commit_list *parents;
321                 struct commit *commit = (struct commit *)o;
322                 if (o->flags & THEY_HAVE)
323                         we_knew_they_have = 1;
324                 else
325                         o->flags |= THEY_HAVE;
326                 if (!oldest_have || (commit->date < oldest_have))
327                         oldest_have = commit->date;
328                 for (parents = commit->parents;
329                      parents;
330                      parents = parents->next)
331                         parents->item->object.flags |= THEY_HAVE;
332         }
333         if (!we_knew_they_have) {
334                 add_object_array(o, NULL, &have_obj);
335                 return 1;
336         }
337         return 0;
338 }
339
340 static int reachable(struct commit *want)
341 {
342         struct prio_queue work = { compare_commits_by_commit_date };
343
344         prio_queue_put(&work, want);
345         while (work.nr) {
346                 struct commit_list *list;
347                 struct commit *commit = prio_queue_get(&work);
348
349                 if (commit->object.flags & THEY_HAVE) {
350                         want->object.flags |= COMMON_KNOWN;
351                         break;
352                 }
353                 if (!commit->object.parsed)
354                         parse_object(the_repository, &commit->object.oid);
355                 if (commit->object.flags & REACHABLE)
356                         continue;
357                 commit->object.flags |= REACHABLE;
358                 if (commit->date < oldest_have)
359                         continue;
360                 for (list = commit->parents; list; list = list->next) {
361                         struct commit *parent = list->item;
362                         if (!(parent->object.flags & REACHABLE))
363                                 prio_queue_put(&work, parent);
364                 }
365         }
366         want->object.flags |= REACHABLE;
367         clear_commit_marks(want, REACHABLE);
368         clear_prio_queue(&work);
369         return (want->object.flags & COMMON_KNOWN);
370 }
371
372 static int ok_to_give_up(void)
373 {
374         int i;
375
376         if (!have_obj.nr)
377                 return 0;
378
379         for (i = 0; i < want_obj.nr; i++) {
380                 struct object *want = want_obj.objects[i].item;
381
382                 if (want->flags & COMMON_KNOWN)
383                         continue;
384                 want = deref_tag(the_repository, want, "a want line", 0);
385                 if (!want || want->type != OBJ_COMMIT) {
386                         /* no way to tell if this is reachable by
387                          * looking at the ancestry chain alone, so
388                          * leave a note to ourselves not to worry about
389                          * this object anymore.
390                          */
391                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
392                         continue;
393                 }
394                 if (!reachable((struct commit *)want))
395                         return 0;
396         }
397         return 1;
398 }
399
400 static int get_common_commits(void)
401 {
402         struct object_id oid;
403         char last_hex[GIT_MAX_HEXSZ + 1];
404         int got_common = 0;
405         int got_other = 0;
406         int sent_ready = 0;
407
408         save_commit_buffer = 0;
409
410         for (;;) {
411                 char *line = packet_read_line(0, NULL);
412                 const char *arg;
413
414                 reset_timeout();
415
416                 if (!line) {
417                         if (multi_ack == 2 && got_common
418                             && !got_other && ok_to_give_up()) {
419                                 sent_ready = 1;
420                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
421                         }
422                         if (have_obj.nr == 0 || multi_ack)
423                                 packet_write_fmt(1, "NAK\n");
424
425                         if (no_done && sent_ready) {
426                                 packet_write_fmt(1, "ACK %s\n", last_hex);
427                                 return 0;
428                         }
429                         if (stateless_rpc)
430                                 exit(0);
431                         got_common = 0;
432                         got_other = 0;
433                         continue;
434                 }
435                 if (skip_prefix(line, "have ", &arg)) {
436                         switch (got_oid(arg, &oid)) {
437                         case -1: /* they have what we do not */
438                                 got_other = 1;
439                                 if (multi_ack && ok_to_give_up()) {
440                                         const char *hex = oid_to_hex(&oid);
441                                         if (multi_ack == 2) {
442                                                 sent_ready = 1;
443                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
444                                         } else
445                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
446                                 }
447                                 break;
448                         default:
449                                 got_common = 1;
450                                 oid_to_hex_r(last_hex, &oid);
451                                 if (multi_ack == 2)
452                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
453                                 else if (multi_ack)
454                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
455                                 else if (have_obj.nr == 1)
456                                         packet_write_fmt(1, "ACK %s\n", last_hex);
457                                 break;
458                         }
459                         continue;
460                 }
461                 if (!strcmp(line, "done")) {
462                         if (have_obj.nr > 0) {
463                                 if (multi_ack)
464                                         packet_write_fmt(1, "ACK %s\n", last_hex);
465                                 return 0;
466                         }
467                         packet_write_fmt(1, "NAK\n");
468                         return -1;
469                 }
470                 die("git upload-pack: expected SHA1 list, got '%s'", line);
471         }
472 }
473
474 static int is_our_ref(struct object *o)
475 {
476         int allow_hidden_ref = (allow_unadvertised_object_request &
477                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
478         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
479 }
480
481 /*
482  * on successful case, it's up to the caller to close cmd->out
483  */
484 static int do_reachable_revlist(struct child_process *cmd,
485                                 struct object_array *src,
486                                 struct object_array *reachable)
487 {
488         static const char *argv[] = {
489                 "rev-list", "--stdin", NULL,
490         };
491         struct object *o;
492         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
493         int i;
494
495         cmd->argv = argv;
496         cmd->git_cmd = 1;
497         cmd->no_stderr = 1;
498         cmd->in = -1;
499         cmd->out = -1;
500
501         /*
502          * If the next rev-list --stdin encounters an unknown commit,
503          * it terminates, which will cause SIGPIPE in the write loop
504          * below.
505          */
506         sigchain_push(SIGPIPE, SIG_IGN);
507
508         if (start_command(cmd))
509                 goto error;
510
511         namebuf[0] = '^';
512         namebuf[GIT_SHA1_HEXSZ + 1] = '\n';
513         for (i = get_max_object_index(); 0 < i; ) {
514                 o = get_indexed_object(--i);
515                 if (!o)
516                         continue;
517                 if (reachable && o->type == OBJ_COMMIT)
518                         o->flags &= ~TMP_MARK;
519                 if (!is_our_ref(o))
520                         continue;
521                 memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
522                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 2) < 0)
523                         goto error;
524         }
525         namebuf[GIT_SHA1_HEXSZ] = '\n';
526         for (i = 0; i < src->nr; i++) {
527                 o = src->objects[i].item;
528                 if (is_our_ref(o)) {
529                         if (reachable)
530                                 add_object_array(o, NULL, reachable);
531                         continue;
532                 }
533                 if (reachable && o->type == OBJ_COMMIT)
534                         o->flags |= TMP_MARK;
535                 memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
536                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 1) < 0)
537                         goto error;
538         }
539         close(cmd->in);
540         cmd->in = -1;
541         sigchain_pop(SIGPIPE);
542
543         return 0;
544
545 error:
546         sigchain_pop(SIGPIPE);
547
548         if (cmd->in >= 0)
549                 close(cmd->in);
550         if (cmd->out >= 0)
551                 close(cmd->out);
552         return -1;
553 }
554
555 static int get_reachable_list(struct object_array *src,
556                               struct object_array *reachable)
557 {
558         struct child_process cmd = CHILD_PROCESS_INIT;
559         int i;
560         struct object *o;
561         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
562         const unsigned hexsz = the_hash_algo->hexsz;
563
564         if (do_reachable_revlist(&cmd, src, reachable) < 0)
565                 return -1;
566
567         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
568                 struct object_id sha1;
569                 const char *p;
570
571                 if (parse_oid_hex(namebuf, &sha1, &p) || *p != '\n')
572                         break;
573
574                 o = lookup_object(the_repository, sha1.hash);
575                 if (o && o->type == OBJ_COMMIT) {
576                         o->flags &= ~TMP_MARK;
577                 }
578         }
579         for (i = get_max_object_index(); 0 < i; i--) {
580                 o = get_indexed_object(i - 1);
581                 if (o && o->type == OBJ_COMMIT &&
582                     (o->flags & TMP_MARK)) {
583                         add_object_array(o, NULL, reachable);
584                                 o->flags &= ~TMP_MARK;
585                 }
586         }
587         close(cmd.out);
588
589         if (finish_command(&cmd))
590                 return -1;
591
592         return 0;
593 }
594
595 static int has_unreachable(struct object_array *src)
596 {
597         struct child_process cmd = CHILD_PROCESS_INIT;
598         char buf[1];
599         int i;
600
601         if (do_reachable_revlist(&cmd, src, NULL) < 0)
602                 return 1;
603
604         /*
605          * The commits out of the rev-list are not ancestors of
606          * our ref.
607          */
608         i = read_in_full(cmd.out, buf, 1);
609         if (i)
610                 goto error;
611         close(cmd.out);
612         cmd.out = -1;
613
614         /*
615          * rev-list may have died by encountering a bad commit
616          * in the history, in which case we do want to bail out
617          * even when it showed no commit.
618          */
619         if (finish_command(&cmd))
620                 goto error;
621
622         /* All the non-tip ones are ancestors of what we advertised */
623         return 0;
624
625 error:
626         sigchain_pop(SIGPIPE);
627         if (cmd.out >= 0)
628                 close(cmd.out);
629         return 1;
630 }
631
632 static void check_non_tip(void)
633 {
634         int i;
635
636         /*
637          * In the normal in-process case without
638          * uploadpack.allowReachableSHA1InWant,
639          * non-tip requests can never happen.
640          */
641         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
642                 goto error;
643         if (!has_unreachable(&want_obj))
644                 /* All the non-tip ones are ancestors of what we advertised */
645                 return;
646
647 error:
648         /* Pick one of them (we know there at least is one) */
649         for (i = 0; i < want_obj.nr; i++) {
650                 struct object *o = want_obj.objects[i].item;
651                 if (!is_our_ref(o))
652                         die("git upload-pack: not our ref %s",
653                             oid_to_hex(&o->oid));
654         }
655 }
656
657 static void send_shallow(struct commit_list *result)
658 {
659         while (result) {
660                 struct object *object = &result->item->object;
661                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
662                         packet_write_fmt(1, "shallow %s",
663                                          oid_to_hex(&object->oid));
664                         register_shallow(the_repository, &object->oid);
665                         shallow_nr++;
666                 }
667                 result = result->next;
668         }
669 }
670
671 static void send_unshallow(const struct object_array *shallows)
672 {
673         int i;
674
675         for (i = 0; i < shallows->nr; i++) {
676                 struct object *object = shallows->objects[i].item;
677                 if (object->flags & NOT_SHALLOW) {
678                         struct commit_list *parents;
679                         packet_write_fmt(1, "unshallow %s",
680                                          oid_to_hex(&object->oid));
681                         object->flags &= ~CLIENT_SHALLOW;
682                         /*
683                          * We want to _register_ "object" as shallow, but we
684                          * also need to traverse object's parents to deepen a
685                          * shallow clone. Unregister it for now so we can
686                          * parse and add the parents to the want list, then
687                          * re-register it.
688                          */
689                         unregister_shallow(&object->oid);
690                         object->parsed = 0;
691                         parse_commit_or_die((struct commit *)object);
692                         parents = ((struct commit *)object)->parents;
693                         while (parents) {
694                                 add_object_array(&parents->item->object,
695                                                  NULL, &want_obj);
696                                 parents = parents->next;
697                         }
698                         add_object_array(object, NULL, &extra_edge_obj);
699                 }
700                 /* make sure commit traversal conforms to client */
701                 register_shallow(the_repository, &object->oid);
702         }
703 }
704
705 static void deepen(int depth, int deepen_relative,
706                    struct object_array *shallows)
707 {
708         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
709                 int i;
710
711                 for (i = 0; i < shallows->nr; i++) {
712                         struct object *object = shallows->objects[i].item;
713                         object->flags |= NOT_SHALLOW;
714                 }
715         } else if (deepen_relative) {
716                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
717                 struct commit_list *result;
718
719                 get_reachable_list(shallows, &reachable_shallows);
720                 result = get_shallow_commits(&reachable_shallows,
721                                              depth + 1,
722                                              SHALLOW, NOT_SHALLOW);
723                 send_shallow(result);
724                 free_commit_list(result);
725                 object_array_clear(&reachable_shallows);
726         } else {
727                 struct commit_list *result;
728
729                 result = get_shallow_commits(&want_obj, depth,
730                                              SHALLOW, NOT_SHALLOW);
731                 send_shallow(result);
732                 free_commit_list(result);
733         }
734
735         send_unshallow(shallows);
736 }
737
738 static void deepen_by_rev_list(int ac, const char **av,
739                                struct object_array *shallows)
740 {
741         struct commit_list *result;
742
743         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
744         send_shallow(result);
745         free_commit_list(result);
746         send_unshallow(shallows);
747 }
748
749 /* Returns 1 if a shallow list is sent or 0 otherwise */
750 static int send_shallow_list(int depth, int deepen_rev_list,
751                              timestamp_t deepen_since,
752                              struct string_list *deepen_not,
753                              struct object_array *shallows)
754 {
755         int ret = 0;
756
757         if (depth > 0 && deepen_rev_list)
758                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
759         if (depth > 0) {
760                 deepen(depth, deepen_relative, shallows);
761                 ret = 1;
762         } else if (deepen_rev_list) {
763                 struct argv_array av = ARGV_ARRAY_INIT;
764                 int i;
765
766                 argv_array_push(&av, "rev-list");
767                 if (deepen_since)
768                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
769                 if (deepen_not->nr) {
770                         argv_array_push(&av, "--not");
771                         for (i = 0; i < deepen_not->nr; i++) {
772                                 struct string_list_item *s = deepen_not->items + i;
773                                 argv_array_push(&av, s->string);
774                         }
775                         argv_array_push(&av, "--not");
776                 }
777                 for (i = 0; i < want_obj.nr; i++) {
778                         struct object *o = want_obj.objects[i].item;
779                         argv_array_push(&av, oid_to_hex(&o->oid));
780                 }
781                 deepen_by_rev_list(av.argc, av.argv, shallows);
782                 argv_array_clear(&av);
783                 ret = 1;
784         } else {
785                 if (shallows->nr > 0) {
786                         int i;
787                         for (i = 0; i < shallows->nr; i++)
788                                 register_shallow(the_repository,
789                                                  &shallows->objects[i].item->oid);
790                 }
791         }
792
793         shallow_nr += shallows->nr;
794         return ret;
795 }
796
797 static int process_shallow(const char *line, struct object_array *shallows)
798 {
799         const char *arg;
800         if (skip_prefix(line, "shallow ", &arg)) {
801                 struct object_id oid;
802                 struct object *object;
803                 if (get_oid_hex(arg, &oid))
804                         die("invalid shallow line: %s", line);
805                 object = parse_object(the_repository, &oid);
806                 if (!object)
807                         return 1;
808                 if (object->type != OBJ_COMMIT)
809                         die("invalid shallow object %s", oid_to_hex(&oid));
810                 if (!(object->flags & CLIENT_SHALLOW)) {
811                         object->flags |= CLIENT_SHALLOW;
812                         add_object_array(object, NULL, shallows);
813                 }
814                 return 1;
815         }
816
817         return 0;
818 }
819
820 static int process_deepen(const char *line, int *depth)
821 {
822         const char *arg;
823         if (skip_prefix(line, "deepen ", &arg)) {
824                 char *end = NULL;
825                 *depth = (int)strtol(arg, &end, 0);
826                 if (!end || *end || *depth <= 0)
827                         die("Invalid deepen: %s", line);
828                 return 1;
829         }
830
831         return 0;
832 }
833
834 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
835 {
836         const char *arg;
837         if (skip_prefix(line, "deepen-since ", &arg)) {
838                 char *end = NULL;
839                 *deepen_since = parse_timestamp(arg, &end, 0);
840                 if (!end || *end || !deepen_since ||
841                     /* revisions.c's max_age -1 is special */
842                     *deepen_since == -1)
843                         die("Invalid deepen-since: %s", line);
844                 *deepen_rev_list = 1;
845                 return 1;
846         }
847         return 0;
848 }
849
850 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
851 {
852         const char *arg;
853         if (skip_prefix(line, "deepen-not ", &arg)) {
854                 char *ref = NULL;
855                 struct object_id oid;
856                 if (expand_ref(arg, strlen(arg), &oid, &ref) != 1)
857                         die("git upload-pack: ambiguous deepen-not: %s", line);
858                 string_list_append(deepen_not, ref);
859                 free(ref);
860                 *deepen_rev_list = 1;
861                 return 1;
862         }
863         return 0;
864 }
865
866 static void receive_needs(void)
867 {
868         struct object_array shallows = OBJECT_ARRAY_INIT;
869         struct string_list deepen_not = STRING_LIST_INIT_DUP;
870         int depth = 0;
871         int has_non_tip = 0;
872         timestamp_t deepen_since = 0;
873         int deepen_rev_list = 0;
874
875         shallow_nr = 0;
876         for (;;) {
877                 struct object *o;
878                 const char *features;
879                 struct object_id oid_buf;
880                 char *line = packet_read_line(0, NULL);
881                 const char *arg;
882
883                 reset_timeout();
884                 if (!line)
885                         break;
886
887                 if (process_shallow(line, &shallows))
888                         continue;
889                 if (process_deepen(line, &depth))
890                         continue;
891                 if (process_deepen_since(line, &deepen_since, &deepen_rev_list))
892                         continue;
893                 if (process_deepen_not(line, &deepen_not, &deepen_rev_list))
894                         continue;
895
896                 if (skip_prefix(line, "filter ", &arg)) {
897                         if (!filter_capability_requested)
898                                 die("git upload-pack: filtering capability not negotiated");
899                         parse_list_objects_filter(&filter_options, arg);
900                         continue;
901                 }
902
903                 if (!skip_prefix(line, "want ", &arg) ||
904                     parse_oid_hex(arg, &oid_buf, &features))
905                         die("git upload-pack: protocol error, "
906                             "expected to get object ID, not '%s'", line);
907
908                 if (parse_feature_request(features, "deepen-relative"))
909                         deepen_relative = 1;
910                 if (parse_feature_request(features, "multi_ack_detailed"))
911                         multi_ack = 2;
912                 else if (parse_feature_request(features, "multi_ack"))
913                         multi_ack = 1;
914                 if (parse_feature_request(features, "no-done"))
915                         no_done = 1;
916                 if (parse_feature_request(features, "thin-pack"))
917                         use_thin_pack = 1;
918                 if (parse_feature_request(features, "ofs-delta"))
919                         use_ofs_delta = 1;
920                 if (parse_feature_request(features, "side-band-64k"))
921                         use_sideband = LARGE_PACKET_MAX;
922                 else if (parse_feature_request(features, "side-band"))
923                         use_sideband = DEFAULT_PACKET_MAX;
924                 if (parse_feature_request(features, "no-progress"))
925                         no_progress = 1;
926                 if (parse_feature_request(features, "include-tag"))
927                         use_include_tag = 1;
928                 if (allow_filter && parse_feature_request(features, "filter"))
929                         filter_capability_requested = 1;
930
931                 o = parse_object(the_repository, &oid_buf);
932                 if (!o) {
933                         packet_write_fmt(1,
934                                          "ERR upload-pack: not our ref %s",
935                                          oid_to_hex(&oid_buf));
936                         die("git upload-pack: not our ref %s",
937                             oid_to_hex(&oid_buf));
938                 }
939                 if (!(o->flags & WANTED)) {
940                         o->flags |= WANTED;
941                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
942                               || is_our_ref(o)))
943                                 has_non_tip = 1;
944                         add_object_array(o, NULL, &want_obj);
945                 }
946         }
947
948         /*
949          * We have sent all our refs already, and the other end
950          * should have chosen out of them. When we are operating
951          * in the stateless RPC mode, however, their choice may
952          * have been based on the set of older refs advertised
953          * by another process that handled the initial request.
954          */
955         if (has_non_tip)
956                 check_non_tip();
957
958         if (!use_sideband && daemon_mode)
959                 no_progress = 1;
960
961         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
962                 return;
963
964         if (send_shallow_list(depth, deepen_rev_list, deepen_since,
965                               &deepen_not, &shallows))
966                 packet_flush(1);
967         object_array_clear(&shallows);
968 }
969
970 /* return non-zero if the ref is hidden, otherwise 0 */
971 static int mark_our_ref(const char *refname, const char *refname_full,
972                         const struct object_id *oid)
973 {
974         struct object *o = lookup_unknown_object(oid->hash);
975
976         if (ref_is_hidden(refname, refname_full)) {
977                 o->flags |= HIDDEN_REF;
978                 return 1;
979         }
980         o->flags |= OUR_REF;
981         return 0;
982 }
983
984 static int check_ref(const char *refname_full, const struct object_id *oid,
985                      int flag, void *cb_data)
986 {
987         const char *refname = strip_namespace(refname_full);
988
989         mark_our_ref(refname, refname_full, oid);
990         return 0;
991 }
992
993 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
994 {
995         struct string_list_item *item;
996
997         if (!symref->nr)
998                 return;
999         for_each_string_list_item(item, symref)
1000                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1001 }
1002
1003 static int send_ref(const char *refname, const struct object_id *oid,
1004                     int flag, void *cb_data)
1005 {
1006         static const char *capabilities = "multi_ack thin-pack side-band"
1007                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1008                 " deepen-relative no-progress include-tag multi_ack_detailed";
1009         const char *refname_nons = strip_namespace(refname);
1010         struct object_id peeled;
1011
1012         if (mark_our_ref(refname_nons, refname, oid))
1013                 return 0;
1014
1015         if (capabilities) {
1016                 struct strbuf symref_info = STRBUF_INIT;
1017
1018                 format_symref_info(&symref_info, cb_data);
1019                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
1020                              oid_to_hex(oid), refname_nons,
1021                              0, capabilities,
1022                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
1023                                      " allow-tip-sha1-in-want" : "",
1024                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
1025                                      " allow-reachable-sha1-in-want" : "",
1026                              stateless_rpc ? " no-done" : "",
1027                              symref_info.buf,
1028                              allow_filter ? " filter" : "",
1029                              git_user_agent_sanitized());
1030                 strbuf_release(&symref_info);
1031         } else {
1032                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1033         }
1034         capabilities = NULL;
1035         if (!peel_ref(refname, &peeled))
1036                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1037         return 0;
1038 }
1039
1040 static int find_symref(const char *refname, const struct object_id *oid,
1041                        int flag, void *cb_data)
1042 {
1043         const char *symref_target;
1044         struct string_list_item *item;
1045
1046         if ((flag & REF_ISSYMREF) == 0)
1047                 return 0;
1048         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1049         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1050                 die("'%s' is a symref but it is not?", refname);
1051         item = string_list_append(cb_data, refname);
1052         item->util = xstrdup(symref_target);
1053         return 0;
1054 }
1055
1056 static int upload_pack_config(const char *var, const char *value, void *unused)
1057 {
1058         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1059                 if (git_config_bool(var, value))
1060                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1061                 else
1062                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1063         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1064                 if (git_config_bool(var, value))
1065                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1066                 else
1067                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1068         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1069                 if (git_config_bool(var, value))
1070                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1071                 else
1072                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1073         } else if (!strcmp("uploadpack.keepalive", var)) {
1074                 keepalive = git_config_int(var, value);
1075                 if (!keepalive)
1076                         keepalive = -1;
1077         } else if (current_config_scope() != CONFIG_SCOPE_REPO) {
1078                 if (!strcmp("uploadpack.packobjectshook", var))
1079                         return git_config_string(&pack_objects_hook, var, value);
1080         } else if (!strcmp("uploadpack.allowfilter", var)) {
1081                 allow_filter = git_config_bool(var, value);
1082         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1083                 allow_ref_in_want = git_config_bool(var, value);
1084         }
1085         return parse_hide_refs_config(var, value, "uploadpack");
1086 }
1087
1088 void upload_pack(struct upload_pack_options *options)
1089 {
1090         struct string_list symref = STRING_LIST_INIT_DUP;
1091
1092         stateless_rpc = options->stateless_rpc;
1093         timeout = options->timeout;
1094         daemon_mode = options->daemon_mode;
1095
1096         git_config(upload_pack_config, NULL);
1097
1098         head_ref_namespaced(find_symref, &symref);
1099
1100         if (options->advertise_refs || !stateless_rpc) {
1101                 reset_timeout();
1102                 head_ref_namespaced(send_ref, &symref);
1103                 for_each_namespaced_ref(send_ref, &symref);
1104                 advertise_shallow_grafts(1);
1105                 packet_flush(1);
1106         } else {
1107                 head_ref_namespaced(check_ref, NULL);
1108                 for_each_namespaced_ref(check_ref, NULL);
1109         }
1110         string_list_clear(&symref, 1);
1111         if (options->advertise_refs)
1112                 return;
1113
1114         receive_needs();
1115         if (want_obj.nr) {
1116                 get_common_commits();
1117                 create_pack_file();
1118         }
1119 }
1120
1121 struct upload_pack_data {
1122         struct object_array wants;
1123         struct string_list wanted_refs;
1124         struct oid_array haves;
1125
1126         struct object_array shallows;
1127         struct string_list deepen_not;
1128         int depth;
1129         timestamp_t deepen_since;
1130         int deepen_rev_list;
1131         int deepen_relative;
1132
1133         unsigned stateless_rpc : 1;
1134
1135         unsigned use_thin_pack : 1;
1136         unsigned use_ofs_delta : 1;
1137         unsigned no_progress : 1;
1138         unsigned use_include_tag : 1;
1139         unsigned done : 1;
1140 };
1141
1142 static void upload_pack_data_init(struct upload_pack_data *data)
1143 {
1144         struct object_array wants = OBJECT_ARRAY_INIT;
1145         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
1146         struct oid_array haves = OID_ARRAY_INIT;
1147         struct object_array shallows = OBJECT_ARRAY_INIT;
1148         struct string_list deepen_not = STRING_LIST_INIT_DUP;
1149
1150         memset(data, 0, sizeof(*data));
1151         data->wants = wants;
1152         data->wanted_refs = wanted_refs;
1153         data->haves = haves;
1154         data->shallows = shallows;
1155         data->deepen_not = deepen_not;
1156 }
1157
1158 static void upload_pack_data_clear(struct upload_pack_data *data)
1159 {
1160         object_array_clear(&data->wants);
1161         string_list_clear(&data->wanted_refs, 1);
1162         oid_array_clear(&data->haves);
1163         object_array_clear(&data->shallows);
1164         string_list_clear(&data->deepen_not, 0);
1165 }
1166
1167 static int parse_want(const char *line)
1168 {
1169         const char *arg;
1170         if (skip_prefix(line, "want ", &arg)) {
1171                 struct object_id oid;
1172                 struct object *o;
1173
1174                 if (get_oid_hex(arg, &oid))
1175                         die("git upload-pack: protocol error, "
1176                             "expected to get oid, not '%s'", line);
1177
1178                 o = parse_object(the_repository, &oid);
1179                 if (!o) {
1180                         packet_write_fmt(1,
1181                                          "ERR upload-pack: not our ref %s",
1182                                          oid_to_hex(&oid));
1183                         die("git upload-pack: not our ref %s",
1184                             oid_to_hex(&oid));
1185                 }
1186
1187                 if (!(o->flags & WANTED)) {
1188                         o->flags |= WANTED;
1189                         add_object_array(o, NULL, &want_obj);
1190                 }
1191
1192                 return 1;
1193         }
1194
1195         return 0;
1196 }
1197
1198 static int parse_want_ref(const char *line, struct string_list *wanted_refs)
1199 {
1200         const char *arg;
1201         if (skip_prefix(line, "want-ref ", &arg)) {
1202                 struct object_id oid;
1203                 struct string_list_item *item;
1204                 struct object *o;
1205
1206                 if (read_ref(arg, &oid)) {
1207                         packet_write_fmt(1, "ERR unknown ref %s", arg);
1208                         die("unknown ref %s", arg);
1209                 }
1210
1211                 item = string_list_append(wanted_refs, arg);
1212                 item->util = oiddup(&oid);
1213
1214                 o = parse_object_or_die(&oid, arg);
1215                 if (!(o->flags & WANTED)) {
1216                         o->flags |= WANTED;
1217                         add_object_array(o, NULL, &want_obj);
1218                 }
1219
1220                 return 1;
1221         }
1222
1223         return 0;
1224 }
1225
1226 static int parse_have(const char *line, struct oid_array *haves)
1227 {
1228         const char *arg;
1229         if (skip_prefix(line, "have ", &arg)) {
1230                 struct object_id oid;
1231
1232                 if (get_oid_hex(arg, &oid))
1233                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1234                 oid_array_append(haves, &oid);
1235                 return 1;
1236         }
1237
1238         return 0;
1239 }
1240
1241 static void process_args(struct packet_reader *request,
1242                          struct upload_pack_data *data)
1243 {
1244         while (packet_reader_read(request) != PACKET_READ_FLUSH) {
1245                 const char *arg = request->line;
1246                 const char *p;
1247
1248                 /* process want */
1249                 if (parse_want(arg))
1250                         continue;
1251                 if (allow_ref_in_want && parse_want_ref(arg, &data->wanted_refs))
1252                         continue;
1253                 /* process have line */
1254                 if (parse_have(arg, &data->haves))
1255                         continue;
1256
1257                 /* process args like thin-pack */
1258                 if (!strcmp(arg, "thin-pack")) {
1259                         use_thin_pack = 1;
1260                         continue;
1261                 }
1262                 if (!strcmp(arg, "ofs-delta")) {
1263                         use_ofs_delta = 1;
1264                         continue;
1265                 }
1266                 if (!strcmp(arg, "no-progress")) {
1267                         no_progress = 1;
1268                         continue;
1269                 }
1270                 if (!strcmp(arg, "include-tag")) {
1271                         use_include_tag = 1;
1272                         continue;
1273                 }
1274                 if (!strcmp(arg, "done")) {
1275                         data->done = 1;
1276                         continue;
1277                 }
1278
1279                 /* Shallow related arguments */
1280                 if (process_shallow(arg, &data->shallows))
1281                         continue;
1282                 if (process_deepen(arg, &data->depth))
1283                         continue;
1284                 if (process_deepen_since(arg, &data->deepen_since,
1285                                          &data->deepen_rev_list))
1286                         continue;
1287                 if (process_deepen_not(arg, &data->deepen_not,
1288                                        &data->deepen_rev_list))
1289                         continue;
1290                 if (!strcmp(arg, "deepen-relative")) {
1291                         data->deepen_relative = 1;
1292                         continue;
1293                 }
1294
1295                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1296                         parse_list_objects_filter(&filter_options, p);
1297                         continue;
1298                 }
1299
1300                 /* ignore unknown lines maybe? */
1301                 die("unexpected line: '%s'", arg);
1302         }
1303 }
1304
1305 static int process_haves(struct oid_array *haves, struct oid_array *common)
1306 {
1307         int i;
1308
1309         /* Process haves */
1310         for (i = 0; i < haves->nr; i++) {
1311                 const struct object_id *oid = &haves->oid[i];
1312                 struct object *o;
1313                 int we_knew_they_have = 0;
1314
1315                 if (!has_object_file(oid))
1316                         continue;
1317
1318                 oid_array_append(common, oid);
1319
1320                 o = parse_object(the_repository, oid);
1321                 if (!o)
1322                         die("oops (%s)", oid_to_hex(oid));
1323                 if (o->type == OBJ_COMMIT) {
1324                         struct commit_list *parents;
1325                         struct commit *commit = (struct commit *)o;
1326                         if (o->flags & THEY_HAVE)
1327                                 we_knew_they_have = 1;
1328                         else
1329                                 o->flags |= THEY_HAVE;
1330                         if (!oldest_have || (commit->date < oldest_have))
1331                                 oldest_have = commit->date;
1332                         for (parents = commit->parents;
1333                              parents;
1334                              parents = parents->next)
1335                                 parents->item->object.flags |= THEY_HAVE;
1336                 }
1337                 if (!we_knew_they_have)
1338                         add_object_array(o, NULL, &have_obj);
1339         }
1340
1341         return 0;
1342 }
1343
1344 static int send_acks(struct oid_array *acks, struct strbuf *response)
1345 {
1346         int i;
1347
1348         packet_buf_write(response, "acknowledgments\n");
1349
1350         /* Send Acks */
1351         if (!acks->nr)
1352                 packet_buf_write(response, "NAK\n");
1353
1354         for (i = 0; i < acks->nr; i++) {
1355                 packet_buf_write(response, "ACK %s\n",
1356                                  oid_to_hex(&acks->oid[i]));
1357         }
1358
1359         if (ok_to_give_up()) {
1360                 /* Send Ready */
1361                 packet_buf_write(response, "ready\n");
1362                 return 1;
1363         }
1364
1365         return 0;
1366 }
1367
1368 static int process_haves_and_send_acks(struct upload_pack_data *data)
1369 {
1370         struct oid_array common = OID_ARRAY_INIT;
1371         struct strbuf response = STRBUF_INIT;
1372         int ret = 0;
1373
1374         process_haves(&data->haves, &common);
1375         if (data->done) {
1376                 ret = 1;
1377         } else if (send_acks(&common, &response)) {
1378                 packet_buf_delim(&response);
1379                 ret = 1;
1380         } else {
1381                 /* Add Flush */
1382                 packet_buf_flush(&response);
1383                 ret = 0;
1384         }
1385
1386         /* Send response */
1387         write_or_die(1, response.buf, response.len);
1388         strbuf_release(&response);
1389
1390         oid_array_clear(&data->haves);
1391         oid_array_clear(&common);
1392         return ret;
1393 }
1394
1395 static void send_wanted_ref_info(struct upload_pack_data *data)
1396 {
1397         const struct string_list_item *item;
1398
1399         if (!data->wanted_refs.nr)
1400                 return;
1401
1402         packet_write_fmt(1, "wanted-refs\n");
1403
1404         for_each_string_list_item(item, &data->wanted_refs) {
1405                 packet_write_fmt(1, "%s %s\n",
1406                                  oid_to_hex(item->util),
1407                                  item->string);
1408         }
1409
1410         packet_delim(1);
1411 }
1412
1413 static void send_shallow_info(struct upload_pack_data *data)
1414 {
1415         /* No shallow info needs to be sent */
1416         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1417             !is_repository_shallow(the_repository))
1418                 return;
1419
1420         packet_write_fmt(1, "shallow-info\n");
1421
1422         if (!send_shallow_list(data->depth, data->deepen_rev_list,
1423                                data->deepen_since, &data->deepen_not,
1424                                &data->shallows) &&
1425             is_repository_shallow(the_repository))
1426                 deepen(INFINITE_DEPTH, data->deepen_relative, &data->shallows);
1427
1428         packet_delim(1);
1429 }
1430
1431 enum fetch_state {
1432         FETCH_PROCESS_ARGS = 0,
1433         FETCH_SEND_ACKS,
1434         FETCH_SEND_PACK,
1435         FETCH_DONE,
1436 };
1437
1438 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1439                    struct packet_reader *request)
1440 {
1441         enum fetch_state state = FETCH_PROCESS_ARGS;
1442         struct upload_pack_data data;
1443
1444         git_config(upload_pack_config, NULL);
1445
1446         upload_pack_data_init(&data);
1447         use_sideband = LARGE_PACKET_MAX;
1448
1449         while (state != FETCH_DONE) {
1450                 switch (state) {
1451                 case FETCH_PROCESS_ARGS:
1452                         process_args(request, &data);
1453
1454                         if (!want_obj.nr) {
1455                                 /*
1456                                  * Request didn't contain any 'want' lines,
1457                                  * guess they didn't want anything.
1458                                  */
1459                                 state = FETCH_DONE;
1460                         } else if (data.haves.nr) {
1461                                 /*
1462                                  * Request had 'have' lines, so lets ACK them.
1463                                  */
1464                                 state = FETCH_SEND_ACKS;
1465                         } else {
1466                                 /*
1467                                  * Request had 'want's but no 'have's so we can
1468                                  * immedietly go to construct and send a pack.
1469                                  */
1470                                 state = FETCH_SEND_PACK;
1471                         }
1472                         break;
1473                 case FETCH_SEND_ACKS:
1474                         if (process_haves_and_send_acks(&data))
1475                                 state = FETCH_SEND_PACK;
1476                         else
1477                                 state = FETCH_DONE;
1478                         break;
1479                 case FETCH_SEND_PACK:
1480                         send_wanted_ref_info(&data);
1481                         send_shallow_info(&data);
1482
1483                         packet_write_fmt(1, "packfile\n");
1484                         create_pack_file();
1485                         state = FETCH_DONE;
1486                         break;
1487                 case FETCH_DONE:
1488                         continue;
1489                 }
1490         }
1491
1492         upload_pack_data_clear(&data);
1493         return 0;
1494 }
1495
1496 int upload_pack_advertise(struct repository *r,
1497                           struct strbuf *value)
1498 {
1499         if (value) {
1500                 int allow_filter_value;
1501                 int allow_ref_in_want;
1502
1503                 strbuf_addstr(value, "shallow");
1504
1505                 if (!repo_config_get_bool(the_repository,
1506                                          "uploadpack.allowfilter",
1507                                          &allow_filter_value) &&
1508                     allow_filter_value)
1509                         strbuf_addstr(value, " filter");
1510
1511                 if (!repo_config_get_bool(the_repository,
1512                                          "uploadpack.allowrefinwant",
1513                                          &allow_ref_in_want) &&
1514                     allow_ref_in_want)
1515                         strbuf_addstr(value, " ref-in-want");
1516         }
1517
1518         return 1;
1519 }