Merge branch 'dl/format-patch-doc-test-cleanup'
[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 multi_ack;
47 static int no_done;
48 static int use_thin_pack, use_ofs_delta, use_include_tag;
49 static int no_progress, daemon_mode;
50 /* Allow specifying sha1 if it is a ref tip. */
51 #define ALLOW_TIP_SHA1  01
52 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
53 #define ALLOW_REACHABLE_SHA1    02
54 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
55 #define ALLOW_ANY_SHA1  07
56 static unsigned int allow_unadvertised_object_request;
57 static int shallow_nr;
58 static struct object_array extra_edge_obj;
59 static unsigned int timeout;
60 static int keepalive = 5;
61 /* 0 for no sideband,
62  * otherwise maximum packet size (up to 65520 bytes).
63  */
64 static int use_sideband;
65 static int stateless_rpc;
66 static const char *pack_objects_hook;
67
68 static int filter_capability_requested;
69 static int allow_filter;
70 static int allow_ref_in_want;
71 static struct list_objects_filter_options filter_options;
72
73 static int allow_sideband_all;
74
75 static void reset_timeout(void)
76 {
77         alarm(timeout);
78 }
79
80 static void send_client_data(int fd, const char *data, ssize_t sz)
81 {
82         if (use_sideband) {
83                 send_sideband(1, fd, data, sz, use_sideband);
84                 return;
85         }
86         if (fd == 3)
87                 /* emergency quit */
88                 fd = 2;
89         if (fd == 2) {
90                 /* XXX: are we happy to lose stuff here? */
91                 xwrite(fd, data, sz);
92                 return;
93         }
94         write_or_die(fd, data, sz);
95 }
96
97 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
98 {
99         FILE *fp = cb_data;
100         if (graft->nr_parent == -1)
101                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
102         return 0;
103 }
104
105 static void create_pack_file(const struct object_array *have_obj,
106                              const struct object_array *want_obj)
107 {
108         struct child_process pack_objects = CHILD_PROCESS_INIT;
109         char data[8193], progress[128];
110         char abort_msg[] = "aborting due to possible repository "
111                 "corruption on the remote side.";
112         int buffered = -1;
113         ssize_t sz;
114         int i;
115         FILE *pipe_fd;
116
117         if (!pack_objects_hook)
118                 pack_objects.git_cmd = 1;
119         else {
120                 argv_array_push(&pack_objects.args, pack_objects_hook);
121                 argv_array_push(&pack_objects.args, "git");
122                 pack_objects.use_shell = 1;
123         }
124
125         if (shallow_nr) {
126                 argv_array_push(&pack_objects.args, "--shallow-file");
127                 argv_array_push(&pack_objects.args, "");
128         }
129         argv_array_push(&pack_objects.args, "pack-objects");
130         argv_array_push(&pack_objects.args, "--revs");
131         if (use_thin_pack)
132                 argv_array_push(&pack_objects.args, "--thin");
133
134         argv_array_push(&pack_objects.args, "--stdout");
135         if (shallow_nr)
136                 argv_array_push(&pack_objects.args, "--shallow");
137         if (!no_progress)
138                 argv_array_push(&pack_objects.args, "--progress");
139         if (use_ofs_delta)
140                 argv_array_push(&pack_objects.args, "--delta-base-offset");
141         if (use_include_tag)
142                 argv_array_push(&pack_objects.args, "--include-tag");
143         if (filter_options.choice) {
144                 const char *spec =
145                         expand_list_objects_filter_spec(&filter_options);
146                 if (pack_objects.use_shell) {
147                         struct strbuf buf = STRBUF_INIT;
148                         sq_quote_buf(&buf, spec);
149                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
150                         strbuf_release(&buf);
151                 } else {
152                         argv_array_pushf(&pack_objects.args, "--filter=%s",
153                                          spec);
154                 }
155         }
156
157         pack_objects.in = -1;
158         pack_objects.out = -1;
159         pack_objects.err = -1;
160
161         if (start_command(&pack_objects))
162                 die("git upload-pack: unable to fork git-pack-objects");
163
164         pipe_fd = xfdopen(pack_objects.in, "w");
165
166         if (shallow_nr)
167                 for_each_commit_graft(write_one_shallow, pipe_fd);
168
169         for (i = 0; i < want_obj->nr; i++)
170                 fprintf(pipe_fd, "%s\n",
171                         oid_to_hex(&want_obj->objects[i].item->oid));
172         fprintf(pipe_fd, "--not\n");
173         for (i = 0; i < have_obj->nr; i++)
174                 fprintf(pipe_fd, "%s\n",
175                         oid_to_hex(&have_obj->objects[i].item->oid));
176         for (i = 0; i < extra_edge_obj.nr; i++)
177                 fprintf(pipe_fd, "%s\n",
178                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
179         fprintf(pipe_fd, "\n");
180         fflush(pipe_fd);
181         fclose(pipe_fd);
182
183         /* We read from pack_objects.err to capture stderr output for
184          * progress bar, and pack_objects.out to capture the pack data.
185          */
186
187         while (1) {
188                 struct pollfd pfd[2];
189                 int pe, pu, pollsize;
190                 int ret;
191
192                 reset_timeout();
193
194                 pollsize = 0;
195                 pe = pu = -1;
196
197                 if (0 <= pack_objects.out) {
198                         pfd[pollsize].fd = pack_objects.out;
199                         pfd[pollsize].events = POLLIN;
200                         pu = pollsize;
201                         pollsize++;
202                 }
203                 if (0 <= pack_objects.err) {
204                         pfd[pollsize].fd = pack_objects.err;
205                         pfd[pollsize].events = POLLIN;
206                         pe = pollsize;
207                         pollsize++;
208                 }
209
210                 if (!pollsize)
211                         break;
212
213                 ret = poll(pfd, pollsize,
214                         keepalive < 0 ? -1 : 1000 * keepalive);
215
216                 if (ret < 0) {
217                         if (errno != EINTR) {
218                                 error_errno("poll failed, resuming");
219                                 sleep(1);
220                         }
221                         continue;
222                 }
223                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
224                         /* Status ready; we ship that in the side-band
225                          * or dump to the standard error.
226                          */
227                         sz = xread(pack_objects.err, progress,
228                                   sizeof(progress));
229                         if (0 < sz)
230                                 send_client_data(2, progress, sz);
231                         else if (sz == 0) {
232                                 close(pack_objects.err);
233                                 pack_objects.err = -1;
234                         }
235                         else
236                                 goto fail;
237                         /* give priority to status messages */
238                         continue;
239                 }
240                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
241                         /* Data ready; we keep the last byte to ourselves
242                          * in case we detect broken rev-list, so that we
243                          * can leave the stream corrupted.  This is
244                          * unfortunate -- unpack-objects would happily
245                          * accept a valid packdata with trailing garbage,
246                          * so appending garbage after we pass all the
247                          * pack data is not good enough to signal
248                          * breakage to downstream.
249                          */
250                         char *cp = data;
251                         ssize_t outsz = 0;
252                         if (0 <= buffered) {
253                                 *cp++ = buffered;
254                                 outsz++;
255                         }
256                         sz = xread(pack_objects.out, cp,
257                                   sizeof(data) - outsz);
258                         if (0 < sz)
259                                 ;
260                         else if (sz == 0) {
261                                 close(pack_objects.out);
262                                 pack_objects.out = -1;
263                         }
264                         else
265                                 goto fail;
266                         sz += outsz;
267                         if (1 < sz) {
268                                 buffered = data[sz-1] & 0xFF;
269                                 sz--;
270                         }
271                         else
272                                 buffered = -1;
273                         send_client_data(1, data, sz);
274                 }
275
276                 /*
277                  * We hit the keepalive timeout without saying anything; send
278                  * an empty message on the data sideband just to let the other
279                  * side know we're still working on it, but don't have any data
280                  * yet.
281                  *
282                  * If we don't have a sideband channel, there's no room in the
283                  * protocol to say anything, so those clients are just out of
284                  * luck.
285                  */
286                 if (!ret && use_sideband) {
287                         static const char buf[] = "0005\1";
288                         write_or_die(1, buf, 5);
289                 }
290         }
291
292         if (finish_command(&pack_objects)) {
293                 error("git upload-pack: git-pack-objects died with error.");
294                 goto fail;
295         }
296
297         /* flush the data */
298         if (0 <= buffered) {
299                 data[0] = buffered;
300                 send_client_data(1, data, 1);
301                 fprintf(stderr, "flushed.\n");
302         }
303         if (use_sideband)
304                 packet_flush(1);
305         return;
306
307  fail:
308         send_client_data(3, abort_msg, sizeof(abort_msg));
309         die("git upload-pack: %s", abort_msg);
310 }
311
312 static int got_oid(const char *hex, struct object_id *oid,
313                    struct object_array *have_obj)
314 {
315         struct object *o;
316         int we_knew_they_have = 0;
317
318         if (get_oid_hex(hex, oid))
319                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
320         if (!has_object_file(oid))
321                 return -1;
322
323         o = parse_object(the_repository, oid);
324         if (!o)
325                 die("oops (%s)", oid_to_hex(oid));
326         if (o->type == OBJ_COMMIT) {
327                 struct commit_list *parents;
328                 struct commit *commit = (struct commit *)o;
329                 if (o->flags & THEY_HAVE)
330                         we_knew_they_have = 1;
331                 else
332                         o->flags |= THEY_HAVE;
333                 if (!oldest_have || (commit->date < oldest_have))
334                         oldest_have = commit->date;
335                 for (parents = commit->parents;
336                      parents;
337                      parents = parents->next)
338                         parents->item->object.flags |= THEY_HAVE;
339         }
340         if (!we_knew_they_have) {
341                 add_object_array(o, NULL, have_obj);
342                 return 1;
343         }
344         return 0;
345 }
346
347 static int ok_to_give_up(const struct object_array *have_obj,
348                          struct object_array *want_obj)
349 {
350         uint32_t min_generation = GENERATION_NUMBER_ZERO;
351
352         if (!have_obj->nr)
353                 return 0;
354
355         return can_all_from_reach_with_flag(want_obj, THEY_HAVE,
356                                             COMMON_KNOWN, oldest_have,
357                                             min_generation);
358 }
359
360 static int get_common_commits(struct packet_reader *reader,
361                               struct object_array *have_obj,
362                               struct object_array *want_obj)
363 {
364         struct object_id oid;
365         char last_hex[GIT_MAX_HEXSZ + 1];
366         int got_common = 0;
367         int got_other = 0;
368         int sent_ready = 0;
369
370         save_commit_buffer = 0;
371
372         for (;;) {
373                 const char *arg;
374
375                 reset_timeout();
376
377                 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
378                         if (multi_ack == 2 && got_common
379                             && !got_other && ok_to_give_up(have_obj, want_obj)) {
380                                 sent_ready = 1;
381                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
382                         }
383                         if (have_obj->nr == 0 || multi_ack)
384                                 packet_write_fmt(1, "NAK\n");
385
386                         if (no_done && sent_ready) {
387                                 packet_write_fmt(1, "ACK %s\n", last_hex);
388                                 return 0;
389                         }
390                         if (stateless_rpc)
391                                 exit(0);
392                         got_common = 0;
393                         got_other = 0;
394                         continue;
395                 }
396                 if (skip_prefix(reader->line, "have ", &arg)) {
397                         switch (got_oid(arg, &oid, have_obj)) {
398                         case -1: /* they have what we do not */
399                                 got_other = 1;
400                                 if (multi_ack && ok_to_give_up(have_obj, want_obj)) {
401                                         const char *hex = oid_to_hex(&oid);
402                                         if (multi_ack == 2) {
403                                                 sent_ready = 1;
404                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
405                                         } else
406                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
407                                 }
408                                 break;
409                         default:
410                                 got_common = 1;
411                                 oid_to_hex_r(last_hex, &oid);
412                                 if (multi_ack == 2)
413                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
414                                 else if (multi_ack)
415                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
416                                 else if (have_obj->nr == 1)
417                                         packet_write_fmt(1, "ACK %s\n", last_hex);
418                                 break;
419                         }
420                         continue;
421                 }
422                 if (!strcmp(reader->line, "done")) {
423                         if (have_obj->nr > 0) {
424                                 if (multi_ack)
425                                         packet_write_fmt(1, "ACK %s\n", last_hex);
426                                 return 0;
427                         }
428                         packet_write_fmt(1, "NAK\n");
429                         return -1;
430                 }
431                 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
432         }
433 }
434
435 static int is_our_ref(struct object *o)
436 {
437         int allow_hidden_ref = (allow_unadvertised_object_request &
438                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
439         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
440 }
441
442 /*
443  * on successful case, it's up to the caller to close cmd->out
444  */
445 static int do_reachable_revlist(struct child_process *cmd,
446                                 struct object_array *src,
447                                 struct object_array *reachable)
448 {
449         static const char *argv[] = {
450                 "rev-list", "--stdin", NULL,
451         };
452         struct object *o;
453         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
454         int i;
455         const unsigned hexsz = the_hash_algo->hexsz;
456
457         cmd->argv = argv;
458         cmd->git_cmd = 1;
459         cmd->no_stderr = 1;
460         cmd->in = -1;
461         cmd->out = -1;
462
463         /*
464          * If the next rev-list --stdin encounters an unknown commit,
465          * it terminates, which will cause SIGPIPE in the write loop
466          * below.
467          */
468         sigchain_push(SIGPIPE, SIG_IGN);
469
470         if (start_command(cmd))
471                 goto error;
472
473         namebuf[0] = '^';
474         namebuf[hexsz + 1] = '\n';
475         for (i = get_max_object_index(); 0 < i; ) {
476                 o = get_indexed_object(--i);
477                 if (!o)
478                         continue;
479                 if (reachable && o->type == OBJ_COMMIT)
480                         o->flags &= ~TMP_MARK;
481                 if (!is_our_ref(o))
482                         continue;
483                 memcpy(namebuf + 1, oid_to_hex(&o->oid), hexsz);
484                 if (write_in_full(cmd->in, namebuf, hexsz + 2) < 0)
485                         goto error;
486         }
487         namebuf[hexsz] = '\n';
488         for (i = 0; i < src->nr; i++) {
489                 o = src->objects[i].item;
490                 if (is_our_ref(o)) {
491                         if (reachable)
492                                 add_object_array(o, NULL, reachable);
493                         continue;
494                 }
495                 if (reachable && o->type == OBJ_COMMIT)
496                         o->flags |= TMP_MARK;
497                 memcpy(namebuf, oid_to_hex(&o->oid), hexsz);
498                 if (write_in_full(cmd->in, namebuf, hexsz + 1) < 0)
499                         goto error;
500         }
501         close(cmd->in);
502         cmd->in = -1;
503         sigchain_pop(SIGPIPE);
504
505         return 0;
506
507 error:
508         sigchain_pop(SIGPIPE);
509
510         if (cmd->in >= 0)
511                 close(cmd->in);
512         if (cmd->out >= 0)
513                 close(cmd->out);
514         return -1;
515 }
516
517 static int get_reachable_list(struct object_array *src,
518                               struct object_array *reachable)
519 {
520         struct child_process cmd = CHILD_PROCESS_INIT;
521         int i;
522         struct object *o;
523         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
524         const unsigned hexsz = the_hash_algo->hexsz;
525
526         if (do_reachable_revlist(&cmd, src, reachable) < 0)
527                 return -1;
528
529         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
530                 struct object_id oid;
531                 const char *p;
532
533                 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
534                         break;
535
536                 o = lookup_object(the_repository, &oid);
537                 if (o && o->type == OBJ_COMMIT) {
538                         o->flags &= ~TMP_MARK;
539                 }
540         }
541         for (i = get_max_object_index(); 0 < i; i--) {
542                 o = get_indexed_object(i - 1);
543                 if (o && o->type == OBJ_COMMIT &&
544                     (o->flags & TMP_MARK)) {
545                         add_object_array(o, NULL, reachable);
546                                 o->flags &= ~TMP_MARK;
547                 }
548         }
549         close(cmd.out);
550
551         if (finish_command(&cmd))
552                 return -1;
553
554         return 0;
555 }
556
557 static int has_unreachable(struct object_array *src)
558 {
559         struct child_process cmd = CHILD_PROCESS_INIT;
560         char buf[1];
561         int i;
562
563         if (do_reachable_revlist(&cmd, src, NULL) < 0)
564                 return 1;
565
566         /*
567          * The commits out of the rev-list are not ancestors of
568          * our ref.
569          */
570         i = read_in_full(cmd.out, buf, 1);
571         if (i)
572                 goto error;
573         close(cmd.out);
574         cmd.out = -1;
575
576         /*
577          * rev-list may have died by encountering a bad commit
578          * in the history, in which case we do want to bail out
579          * even when it showed no commit.
580          */
581         if (finish_command(&cmd))
582                 goto error;
583
584         /* All the non-tip ones are ancestors of what we advertised */
585         return 0;
586
587 error:
588         sigchain_pop(SIGPIPE);
589         if (cmd.out >= 0)
590                 close(cmd.out);
591         return 1;
592 }
593
594 static void check_non_tip(struct object_array *want_obj,
595                           struct packet_writer *writer)
596 {
597         int i;
598
599         /*
600          * In the normal in-process case without
601          * uploadpack.allowReachableSHA1InWant,
602          * non-tip requests can never happen.
603          */
604         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
605                 goto error;
606         if (!has_unreachable(want_obj))
607                 /* All the non-tip ones are ancestors of what we advertised */
608                 return;
609
610 error:
611         /* Pick one of them (we know there at least is one) */
612         for (i = 0; i < want_obj->nr; i++) {
613                 struct object *o = want_obj->objects[i].item;
614                 if (!is_our_ref(o)) {
615                         packet_writer_error(writer,
616                                             "upload-pack: not our ref %s",
617                                             oid_to_hex(&o->oid));
618                         die("git upload-pack: not our ref %s",
619                             oid_to_hex(&o->oid));
620                 }
621         }
622 }
623
624 static void send_shallow(struct packet_writer *writer,
625                          struct commit_list *result)
626 {
627         while (result) {
628                 struct object *object = &result->item->object;
629                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
630                         packet_writer_write(writer, "shallow %s",
631                                             oid_to_hex(&object->oid));
632                         register_shallow(the_repository, &object->oid);
633                         shallow_nr++;
634                 }
635                 result = result->next;
636         }
637 }
638
639 static void send_unshallow(struct packet_writer *writer,
640                            const struct object_array *shallows,
641                            struct object_array *want_obj)
642 {
643         int i;
644
645         for (i = 0; i < shallows->nr; i++) {
646                 struct object *object = shallows->objects[i].item;
647                 if (object->flags & NOT_SHALLOW) {
648                         struct commit_list *parents;
649                         packet_writer_write(writer, "unshallow %s",
650                                             oid_to_hex(&object->oid));
651                         object->flags &= ~CLIENT_SHALLOW;
652                         /*
653                          * We want to _register_ "object" as shallow, but we
654                          * also need to traverse object's parents to deepen a
655                          * shallow clone. Unregister it for now so we can
656                          * parse and add the parents to the want list, then
657                          * re-register it.
658                          */
659                         unregister_shallow(&object->oid);
660                         object->parsed = 0;
661                         parse_commit_or_die((struct commit *)object);
662                         parents = ((struct commit *)object)->parents;
663                         while (parents) {
664                                 add_object_array(&parents->item->object,
665                                                  NULL, want_obj);
666                                 parents = parents->next;
667                         }
668                         add_object_array(object, NULL, &extra_edge_obj);
669                 }
670                 /* make sure commit traversal conforms to client */
671                 register_shallow(the_repository, &object->oid);
672         }
673 }
674
675 static int check_ref(const char *refname_full, const struct object_id *oid,
676                      int flag, void *cb_data);
677 static void deepen(struct packet_writer *writer, int depth, int deepen_relative,
678                    struct object_array *shallows, struct object_array *want_obj)
679 {
680         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
681                 int i;
682
683                 for (i = 0; i < shallows->nr; i++) {
684                         struct object *object = shallows->objects[i].item;
685                         object->flags |= NOT_SHALLOW;
686                 }
687         } else if (deepen_relative) {
688                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
689                 struct commit_list *result;
690
691                 /*
692                  * Checking for reachable shallows requires that our refs be
693                  * marked with OUR_REF.
694                  */
695                 head_ref_namespaced(check_ref, NULL);
696                 for_each_namespaced_ref(check_ref, NULL);
697
698                 get_reachable_list(shallows, &reachable_shallows);
699                 result = get_shallow_commits(&reachable_shallows,
700                                              depth + 1,
701                                              SHALLOW, NOT_SHALLOW);
702                 send_shallow(writer, result);
703                 free_commit_list(result);
704                 object_array_clear(&reachable_shallows);
705         } else {
706                 struct commit_list *result;
707
708                 result = get_shallow_commits(want_obj, depth,
709                                              SHALLOW, NOT_SHALLOW);
710                 send_shallow(writer, result);
711                 free_commit_list(result);
712         }
713
714         send_unshallow(writer, shallows, want_obj);
715 }
716
717 static void deepen_by_rev_list(struct packet_writer *writer, int ac,
718                                const char **av,
719                                struct object_array *shallows,
720                                struct object_array *want_obj)
721 {
722         struct commit_list *result;
723
724         disable_commit_graph(the_repository);
725         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
726         send_shallow(writer, result);
727         free_commit_list(result);
728         send_unshallow(writer, shallows, want_obj);
729 }
730
731 /* Returns 1 if a shallow list is sent or 0 otherwise */
732 static int send_shallow_list(struct packet_writer *writer,
733                              int depth, int deepen_rev_list,
734                              timestamp_t deepen_since,
735                              struct string_list *deepen_not,
736                              int deepen_relative,
737                              struct object_array *shallows,
738                              struct object_array *want_obj)
739 {
740         int ret = 0;
741
742         if (depth > 0 && deepen_rev_list)
743                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
744         if (depth > 0) {
745                 deepen(writer, depth, deepen_relative, shallows, want_obj);
746                 ret = 1;
747         } else if (deepen_rev_list) {
748                 struct argv_array av = ARGV_ARRAY_INIT;
749                 int i;
750
751                 argv_array_push(&av, "rev-list");
752                 if (deepen_since)
753                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
754                 if (deepen_not->nr) {
755                         argv_array_push(&av, "--not");
756                         for (i = 0; i < deepen_not->nr; i++) {
757                                 struct string_list_item *s = deepen_not->items + i;
758                                 argv_array_push(&av, s->string);
759                         }
760                         argv_array_push(&av, "--not");
761                 }
762                 for (i = 0; i < want_obj->nr; i++) {
763                         struct object *o = want_obj->objects[i].item;
764                         argv_array_push(&av, oid_to_hex(&o->oid));
765                 }
766                 deepen_by_rev_list(writer, av.argc, av.argv, shallows, want_obj);
767                 argv_array_clear(&av);
768                 ret = 1;
769         } else {
770                 if (shallows->nr > 0) {
771                         int i;
772                         for (i = 0; i < shallows->nr; i++)
773                                 register_shallow(the_repository,
774                                                  &shallows->objects[i].item->oid);
775                 }
776         }
777
778         shallow_nr += shallows->nr;
779         return ret;
780 }
781
782 static int process_shallow(const char *line, struct object_array *shallows)
783 {
784         const char *arg;
785         if (skip_prefix(line, "shallow ", &arg)) {
786                 struct object_id oid;
787                 struct object *object;
788                 if (get_oid_hex(arg, &oid))
789                         die("invalid shallow line: %s", line);
790                 object = parse_object(the_repository, &oid);
791                 if (!object)
792                         return 1;
793                 if (object->type != OBJ_COMMIT)
794                         die("invalid shallow object %s", oid_to_hex(&oid));
795                 if (!(object->flags & CLIENT_SHALLOW)) {
796                         object->flags |= CLIENT_SHALLOW;
797                         add_object_array(object, NULL, shallows);
798                 }
799                 return 1;
800         }
801
802         return 0;
803 }
804
805 static int process_deepen(const char *line, int *depth)
806 {
807         const char *arg;
808         if (skip_prefix(line, "deepen ", &arg)) {
809                 char *end = NULL;
810                 *depth = (int)strtol(arg, &end, 0);
811                 if (!end || *end || *depth <= 0)
812                         die("Invalid deepen: %s", line);
813                 return 1;
814         }
815
816         return 0;
817 }
818
819 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
820 {
821         const char *arg;
822         if (skip_prefix(line, "deepen-since ", &arg)) {
823                 char *end = NULL;
824                 *deepen_since = parse_timestamp(arg, &end, 0);
825                 if (!end || *end || !deepen_since ||
826                     /* revisions.c's max_age -1 is special */
827                     *deepen_since == -1)
828                         die("Invalid deepen-since: %s", line);
829                 *deepen_rev_list = 1;
830                 return 1;
831         }
832         return 0;
833 }
834
835 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
836 {
837         const char *arg;
838         if (skip_prefix(line, "deepen-not ", &arg)) {
839                 char *ref = NULL;
840                 struct object_id oid;
841                 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
842                         die("git upload-pack: ambiguous deepen-not: %s", line);
843                 string_list_append(deepen_not, ref);
844                 free(ref);
845                 *deepen_rev_list = 1;
846                 return 1;
847         }
848         return 0;
849 }
850
851 static void receive_needs(struct packet_reader *reader, struct object_array *want_obj)
852 {
853         struct object_array shallows = OBJECT_ARRAY_INIT;
854         struct string_list deepen_not = STRING_LIST_INIT_DUP;
855         int depth = 0;
856         int has_non_tip = 0;
857         timestamp_t deepen_since = 0;
858         int deepen_rev_list = 0;
859         int deepen_relative = 0;
860         struct packet_writer writer;
861
862         shallow_nr = 0;
863         packet_writer_init(&writer, 1);
864         for (;;) {
865                 struct object *o;
866                 const char *features;
867                 struct object_id oid_buf;
868                 const char *arg;
869
870                 reset_timeout();
871                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
872                         break;
873
874                 if (process_shallow(reader->line, &shallows))
875                         continue;
876                 if (process_deepen(reader->line, &depth))
877                         continue;
878                 if (process_deepen_since(reader->line, &deepen_since, &deepen_rev_list))
879                         continue;
880                 if (process_deepen_not(reader->line, &deepen_not, &deepen_rev_list))
881                         continue;
882
883                 if (skip_prefix(reader->line, "filter ", &arg)) {
884                         if (!filter_capability_requested)
885                                 die("git upload-pack: filtering capability not negotiated");
886                         list_objects_filter_die_if_populated(&filter_options);
887                         parse_list_objects_filter(&filter_options, arg);
888                         continue;
889                 }
890
891                 if (!skip_prefix(reader->line, "want ", &arg) ||
892                     parse_oid_hex(arg, &oid_buf, &features))
893                         die("git upload-pack: protocol error, "
894                             "expected to get object ID, not '%s'", reader->line);
895
896                 if (parse_feature_request(features, "deepen-relative"))
897                         deepen_relative = 1;
898                 if (parse_feature_request(features, "multi_ack_detailed"))
899                         multi_ack = 2;
900                 else if (parse_feature_request(features, "multi_ack"))
901                         multi_ack = 1;
902                 if (parse_feature_request(features, "no-done"))
903                         no_done = 1;
904                 if (parse_feature_request(features, "thin-pack"))
905                         use_thin_pack = 1;
906                 if (parse_feature_request(features, "ofs-delta"))
907                         use_ofs_delta = 1;
908                 if (parse_feature_request(features, "side-band-64k"))
909                         use_sideband = LARGE_PACKET_MAX;
910                 else if (parse_feature_request(features, "side-band"))
911                         use_sideband = DEFAULT_PACKET_MAX;
912                 if (parse_feature_request(features, "no-progress"))
913                         no_progress = 1;
914                 if (parse_feature_request(features, "include-tag"))
915                         use_include_tag = 1;
916                 if (allow_filter && parse_feature_request(features, "filter"))
917                         filter_capability_requested = 1;
918
919                 o = parse_object(the_repository, &oid_buf);
920                 if (!o) {
921                         packet_writer_error(&writer,
922                                             "upload-pack: not our ref %s",
923                                             oid_to_hex(&oid_buf));
924                         die("git upload-pack: not our ref %s",
925                             oid_to_hex(&oid_buf));
926                 }
927                 if (!(o->flags & WANTED)) {
928                         o->flags |= WANTED;
929                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
930                               || is_our_ref(o)))
931                                 has_non_tip = 1;
932                         add_object_array(o, NULL, want_obj);
933                 }
934         }
935
936         /*
937          * We have sent all our refs already, and the other end
938          * should have chosen out of them. When we are operating
939          * in the stateless RPC mode, however, their choice may
940          * have been based on the set of older refs advertised
941          * by another process that handled the initial request.
942          */
943         if (has_non_tip)
944                 check_non_tip(want_obj, &writer);
945
946         if (!use_sideband && daemon_mode)
947                 no_progress = 1;
948
949         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
950                 return;
951
952         if (send_shallow_list(&writer, depth, deepen_rev_list, deepen_since,
953                               &deepen_not, deepen_relative, &shallows,
954                               want_obj))
955                 packet_flush(1);
956         object_array_clear(&shallows);
957 }
958
959 /* return non-zero if the ref is hidden, otherwise 0 */
960 static int mark_our_ref(const char *refname, const char *refname_full,
961                         const struct object_id *oid)
962 {
963         struct object *o = lookup_unknown_object(oid);
964
965         if (ref_is_hidden(refname, refname_full)) {
966                 o->flags |= HIDDEN_REF;
967                 return 1;
968         }
969         o->flags |= OUR_REF;
970         return 0;
971 }
972
973 static int check_ref(const char *refname_full, const struct object_id *oid,
974                      int flag, void *cb_data)
975 {
976         const char *refname = strip_namespace(refname_full);
977
978         mark_our_ref(refname, refname_full, oid);
979         return 0;
980 }
981
982 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
983 {
984         struct string_list_item *item;
985
986         if (!symref->nr)
987                 return;
988         for_each_string_list_item(item, symref)
989                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
990 }
991
992 static int send_ref(const char *refname, const struct object_id *oid,
993                     int flag, void *cb_data)
994 {
995         static const char *capabilities = "multi_ack thin-pack side-band"
996                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
997                 " deepen-relative no-progress include-tag multi_ack_detailed";
998         const char *refname_nons = strip_namespace(refname);
999         struct object_id peeled;
1000
1001         if (mark_our_ref(refname_nons, refname, oid))
1002                 return 0;
1003
1004         if (capabilities) {
1005                 struct strbuf symref_info = STRBUF_INIT;
1006
1007                 format_symref_info(&symref_info, cb_data);
1008                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
1009                              oid_to_hex(oid), refname_nons,
1010                              0, capabilities,
1011                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
1012                                      " allow-tip-sha1-in-want" : "",
1013                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
1014                                      " allow-reachable-sha1-in-want" : "",
1015                              stateless_rpc ? " no-done" : "",
1016                              symref_info.buf,
1017                              allow_filter ? " filter" : "",
1018                              git_user_agent_sanitized());
1019                 strbuf_release(&symref_info);
1020         } else {
1021                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1022         }
1023         capabilities = NULL;
1024         if (!peel_ref(refname, &peeled))
1025                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1026         return 0;
1027 }
1028
1029 static int find_symref(const char *refname, const struct object_id *oid,
1030                        int flag, void *cb_data)
1031 {
1032         const char *symref_target;
1033         struct string_list_item *item;
1034
1035         if ((flag & REF_ISSYMREF) == 0)
1036                 return 0;
1037         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1038         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1039                 die("'%s' is a symref but it is not?", refname);
1040         item = string_list_append(cb_data, strip_namespace(refname));
1041         item->util = xstrdup(strip_namespace(symref_target));
1042         return 0;
1043 }
1044
1045 static int upload_pack_config(const char *var, const char *value, void *unused)
1046 {
1047         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1048                 if (git_config_bool(var, value))
1049                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1050                 else
1051                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1052         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1053                 if (git_config_bool(var, value))
1054                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1055                 else
1056                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1057         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1058                 if (git_config_bool(var, value))
1059                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1060                 else
1061                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1062         } else if (!strcmp("uploadpack.keepalive", var)) {
1063                 keepalive = git_config_int(var, value);
1064                 if (!keepalive)
1065                         keepalive = -1;
1066         } else if (!strcmp("uploadpack.allowfilter", var)) {
1067                 allow_filter = git_config_bool(var, value);
1068         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1069                 allow_ref_in_want = git_config_bool(var, value);
1070         } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1071                 allow_sideband_all = git_config_bool(var, value);
1072         } else if (!strcmp("core.precomposeunicode", var)) {
1073                 precomposed_unicode = git_config_bool(var, value);
1074         }
1075
1076         if (current_config_scope() != CONFIG_SCOPE_REPO) {
1077                 if (!strcmp("uploadpack.packobjectshook", var))
1078                         return git_config_string(&pack_objects_hook, var, value);
1079         }
1080
1081         return parse_hide_refs_config(var, value, "uploadpack");
1082 }
1083
1084 void upload_pack(struct upload_pack_options *options)
1085 {
1086         struct string_list symref = STRING_LIST_INIT_DUP;
1087         struct object_array want_obj = OBJECT_ARRAY_INIT;
1088         struct packet_reader reader;
1089
1090         stateless_rpc = options->stateless_rpc;
1091         timeout = options->timeout;
1092         daemon_mode = options->daemon_mode;
1093
1094         git_config(upload_pack_config, NULL);
1095
1096         head_ref_namespaced(find_symref, &symref);
1097
1098         if (options->advertise_refs || !stateless_rpc) {
1099                 reset_timeout();
1100                 head_ref_namespaced(send_ref, &symref);
1101                 for_each_namespaced_ref(send_ref, &symref);
1102                 advertise_shallow_grafts(1);
1103                 packet_flush(1);
1104         } else {
1105                 head_ref_namespaced(check_ref, NULL);
1106                 for_each_namespaced_ref(check_ref, NULL);
1107         }
1108         string_list_clear(&symref, 1);
1109         if (options->advertise_refs)
1110                 return;
1111
1112         packet_reader_init(&reader, 0, NULL, 0,
1113                            PACKET_READ_CHOMP_NEWLINE |
1114                            PACKET_READ_DIE_ON_ERR_PACKET);
1115
1116         receive_needs(&reader, &want_obj);
1117         if (want_obj.nr) {
1118                 struct object_array have_obj = OBJECT_ARRAY_INIT;
1119                 get_common_commits(&reader, &have_obj, &want_obj);
1120                 create_pack_file(&have_obj, &want_obj);
1121         }
1122 }
1123
1124 struct upload_pack_data {
1125         struct object_array wants;
1126         struct string_list wanted_refs;
1127         struct oid_array haves;
1128
1129         struct object_array shallows;
1130         struct string_list deepen_not;
1131         int depth;
1132         timestamp_t deepen_since;
1133         int deepen_rev_list;
1134         int deepen_relative;
1135
1136         struct packet_writer writer;
1137
1138         unsigned stateless_rpc : 1;
1139
1140         unsigned use_thin_pack : 1;
1141         unsigned use_ofs_delta : 1;
1142         unsigned no_progress : 1;
1143         unsigned use_include_tag : 1;
1144         unsigned done : 1;
1145 };
1146
1147 static void upload_pack_data_init(struct upload_pack_data *data)
1148 {
1149         struct object_array wants = OBJECT_ARRAY_INIT;
1150         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
1151         struct oid_array haves = OID_ARRAY_INIT;
1152         struct object_array shallows = OBJECT_ARRAY_INIT;
1153         struct string_list deepen_not = STRING_LIST_INIT_DUP;
1154
1155         memset(data, 0, sizeof(*data));
1156         data->wants = wants;
1157         data->wanted_refs = wanted_refs;
1158         data->haves = haves;
1159         data->shallows = shallows;
1160         data->deepen_not = deepen_not;
1161         packet_writer_init(&data->writer, 1);
1162 }
1163
1164 static void upload_pack_data_clear(struct upload_pack_data *data)
1165 {
1166         object_array_clear(&data->wants);
1167         string_list_clear(&data->wanted_refs, 1);
1168         oid_array_clear(&data->haves);
1169         object_array_clear(&data->shallows);
1170         string_list_clear(&data->deepen_not, 0);
1171 }
1172
1173 static int parse_want(struct packet_writer *writer, const char *line,
1174                       struct object_array *want_obj)
1175 {
1176         const char *arg;
1177         if (skip_prefix(line, "want ", &arg)) {
1178                 struct object_id oid;
1179                 struct object *o;
1180
1181                 if (get_oid_hex(arg, &oid))
1182                         die("git upload-pack: protocol error, "
1183                             "expected to get oid, not '%s'", line);
1184
1185                 o = parse_object(the_repository, &oid);
1186                 if (!o) {
1187                         packet_writer_error(writer,
1188                                             "upload-pack: not our ref %s",
1189                                             oid_to_hex(&oid));
1190                         die("git upload-pack: not our ref %s",
1191                             oid_to_hex(&oid));
1192                 }
1193
1194                 if (!(o->flags & WANTED)) {
1195                         o->flags |= WANTED;
1196                         add_object_array(o, NULL, want_obj);
1197                 }
1198
1199                 return 1;
1200         }
1201
1202         return 0;
1203 }
1204
1205 static int parse_want_ref(struct packet_writer *writer, const char *line,
1206                           struct string_list *wanted_refs,
1207                           struct object_array *want_obj)
1208 {
1209         const char *arg;
1210         if (skip_prefix(line, "want-ref ", &arg)) {
1211                 struct object_id oid;
1212                 struct string_list_item *item;
1213                 struct object *o;
1214
1215                 if (read_ref(arg, &oid)) {
1216                         packet_writer_error(writer, "unknown ref %s", arg);
1217                         die("unknown ref %s", arg);
1218                 }
1219
1220                 item = string_list_append(wanted_refs, arg);
1221                 item->util = oiddup(&oid);
1222
1223                 o = parse_object_or_die(&oid, arg);
1224                 if (!(o->flags & WANTED)) {
1225                         o->flags |= WANTED;
1226                         add_object_array(o, NULL, want_obj);
1227                 }
1228
1229                 return 1;
1230         }
1231
1232         return 0;
1233 }
1234
1235 static int parse_have(const char *line, struct oid_array *haves)
1236 {
1237         const char *arg;
1238         if (skip_prefix(line, "have ", &arg)) {
1239                 struct object_id oid;
1240
1241                 if (get_oid_hex(arg, &oid))
1242                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1243                 oid_array_append(haves, &oid);
1244                 return 1;
1245         }
1246
1247         return 0;
1248 }
1249
1250 static void process_args(struct packet_reader *request,
1251                          struct upload_pack_data *data,
1252                          struct object_array *want_obj)
1253 {
1254         while (packet_reader_read(request) != PACKET_READ_FLUSH) {
1255                 const char *arg = request->line;
1256                 const char *p;
1257
1258                 /* process want */
1259                 if (parse_want(&data->writer, arg, want_obj))
1260                         continue;
1261                 if (allow_ref_in_want &&
1262                     parse_want_ref(&data->writer, arg, &data->wanted_refs,
1263                                    want_obj))
1264                         continue;
1265                 /* process have line */
1266                 if (parse_have(arg, &data->haves))
1267                         continue;
1268
1269                 /* process args like thin-pack */
1270                 if (!strcmp(arg, "thin-pack")) {
1271                         use_thin_pack = 1;
1272                         continue;
1273                 }
1274                 if (!strcmp(arg, "ofs-delta")) {
1275                         use_ofs_delta = 1;
1276                         continue;
1277                 }
1278                 if (!strcmp(arg, "no-progress")) {
1279                         no_progress = 1;
1280                         continue;
1281                 }
1282                 if (!strcmp(arg, "include-tag")) {
1283                         use_include_tag = 1;
1284                         continue;
1285                 }
1286                 if (!strcmp(arg, "done")) {
1287                         data->done = 1;
1288                         continue;
1289                 }
1290
1291                 /* Shallow related arguments */
1292                 if (process_shallow(arg, &data->shallows))
1293                         continue;
1294                 if (process_deepen(arg, &data->depth))
1295                         continue;
1296                 if (process_deepen_since(arg, &data->deepen_since,
1297                                          &data->deepen_rev_list))
1298                         continue;
1299                 if (process_deepen_not(arg, &data->deepen_not,
1300                                        &data->deepen_rev_list))
1301                         continue;
1302                 if (!strcmp(arg, "deepen-relative")) {
1303                         data->deepen_relative = 1;
1304                         continue;
1305                 }
1306
1307                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1308                         list_objects_filter_die_if_populated(&filter_options);
1309                         parse_list_objects_filter(&filter_options, p);
1310                         continue;
1311                 }
1312
1313                 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1314                      allow_sideband_all) &&
1315                     !strcmp(arg, "sideband-all")) {
1316                         data->writer.use_sideband = 1;
1317                         continue;
1318                 }
1319
1320                 /* ignore unknown lines maybe? */
1321                 die("unexpected line: '%s'", arg);
1322         }
1323 }
1324
1325 static int process_haves(struct oid_array *haves, struct oid_array *common,
1326                          struct object_array *have_obj)
1327 {
1328         int i;
1329
1330         /* Process haves */
1331         for (i = 0; i < haves->nr; i++) {
1332                 const struct object_id *oid = &haves->oid[i];
1333                 struct object *o;
1334                 int we_knew_they_have = 0;
1335
1336                 if (!has_object_file(oid))
1337                         continue;
1338
1339                 oid_array_append(common, oid);
1340
1341                 o = parse_object(the_repository, oid);
1342                 if (!o)
1343                         die("oops (%s)", oid_to_hex(oid));
1344                 if (o->type == OBJ_COMMIT) {
1345                         struct commit_list *parents;
1346                         struct commit *commit = (struct commit *)o;
1347                         if (o->flags & THEY_HAVE)
1348                                 we_knew_they_have = 1;
1349                         else
1350                                 o->flags |= THEY_HAVE;
1351                         if (!oldest_have || (commit->date < oldest_have))
1352                                 oldest_have = commit->date;
1353                         for (parents = commit->parents;
1354                              parents;
1355                              parents = parents->next)
1356                                 parents->item->object.flags |= THEY_HAVE;
1357                 }
1358                 if (!we_knew_they_have)
1359                         add_object_array(o, NULL, have_obj);
1360         }
1361
1362         return 0;
1363 }
1364
1365 static int send_acks(struct packet_writer *writer, struct oid_array *acks,
1366                      const struct object_array *have_obj,
1367                      struct object_array *want_obj)
1368 {
1369         int i;
1370
1371         packet_writer_write(writer, "acknowledgments\n");
1372
1373         /* Send Acks */
1374         if (!acks->nr)
1375                 packet_writer_write(writer, "NAK\n");
1376
1377         for (i = 0; i < acks->nr; i++) {
1378                 packet_writer_write(writer, "ACK %s\n",
1379                                     oid_to_hex(&acks->oid[i]));
1380         }
1381
1382         if (ok_to_give_up(have_obj, want_obj)) {
1383                 /* Send Ready */
1384                 packet_writer_write(writer, "ready\n");
1385                 return 1;
1386         }
1387
1388         return 0;
1389 }
1390
1391 static int process_haves_and_send_acks(struct upload_pack_data *data,
1392                                        struct object_array *have_obj,
1393                                        struct object_array *want_obj)
1394 {
1395         struct oid_array common = OID_ARRAY_INIT;
1396         int ret = 0;
1397
1398         process_haves(&data->haves, &common, have_obj);
1399         if (data->done) {
1400                 ret = 1;
1401         } else if (send_acks(&data->writer, &common, have_obj, want_obj)) {
1402                 packet_writer_delim(&data->writer);
1403                 ret = 1;
1404         } else {
1405                 /* Add Flush */
1406                 packet_writer_flush(&data->writer);
1407                 ret = 0;
1408         }
1409
1410         oid_array_clear(&data->haves);
1411         oid_array_clear(&common);
1412         return ret;
1413 }
1414
1415 static void send_wanted_ref_info(struct upload_pack_data *data)
1416 {
1417         const struct string_list_item *item;
1418
1419         if (!data->wanted_refs.nr)
1420                 return;
1421
1422         packet_writer_write(&data->writer, "wanted-refs\n");
1423
1424         for_each_string_list_item(item, &data->wanted_refs) {
1425                 packet_writer_write(&data->writer, "%s %s\n",
1426                                     oid_to_hex(item->util),
1427                                     item->string);
1428         }
1429
1430         packet_writer_delim(&data->writer);
1431 }
1432
1433 static void send_shallow_info(struct upload_pack_data *data,
1434                               struct object_array *want_obj)
1435 {
1436         /* No shallow info needs to be sent */
1437         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1438             !is_repository_shallow(the_repository))
1439                 return;
1440
1441         packet_writer_write(&data->writer, "shallow-info\n");
1442
1443         if (!send_shallow_list(&data->writer, data->depth,
1444                                data->deepen_rev_list,
1445                                data->deepen_since, &data->deepen_not,
1446                                data->deepen_relative,
1447                                &data->shallows, want_obj) &&
1448             is_repository_shallow(the_repository))
1449                 deepen(&data->writer, INFINITE_DEPTH, data->deepen_relative,
1450                        &data->shallows, want_obj);
1451
1452         packet_delim(1);
1453 }
1454
1455 enum fetch_state {
1456         FETCH_PROCESS_ARGS = 0,
1457         FETCH_SEND_ACKS,
1458         FETCH_SEND_PACK,
1459         FETCH_DONE,
1460 };
1461
1462 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1463                    struct packet_reader *request)
1464 {
1465         enum fetch_state state = FETCH_PROCESS_ARGS;
1466         struct upload_pack_data data;
1467         struct object_array have_obj = OBJECT_ARRAY_INIT;
1468         struct object_array want_obj = OBJECT_ARRAY_INIT;
1469
1470         clear_object_flags(ALL_FLAGS);
1471
1472         git_config(upload_pack_config, NULL);
1473
1474         upload_pack_data_init(&data);
1475         use_sideband = LARGE_PACKET_MAX;
1476
1477         while (state != FETCH_DONE) {
1478                 switch (state) {
1479                 case FETCH_PROCESS_ARGS:
1480                         process_args(request, &data, &want_obj);
1481
1482                         if (!want_obj.nr) {
1483                                 /*
1484                                  * Request didn't contain any 'want' lines,
1485                                  * guess they didn't want anything.
1486                                  */
1487                                 state = FETCH_DONE;
1488                         } else if (data.haves.nr) {
1489                                 /*
1490                                  * Request had 'have' lines, so lets ACK them.
1491                                  */
1492                                 state = FETCH_SEND_ACKS;
1493                         } else {
1494                                 /*
1495                                  * Request had 'want's but no 'have's so we can
1496                                  * immedietly go to construct and send a pack.
1497                                  */
1498                                 state = FETCH_SEND_PACK;
1499                         }
1500                         break;
1501                 case FETCH_SEND_ACKS:
1502                         if (process_haves_and_send_acks(&data, &have_obj,
1503                                                         &want_obj))
1504                                 state = FETCH_SEND_PACK;
1505                         else
1506                                 state = FETCH_DONE;
1507                         break;
1508                 case FETCH_SEND_PACK:
1509                         send_wanted_ref_info(&data);
1510                         send_shallow_info(&data, &want_obj);
1511
1512                         packet_writer_write(&data.writer, "packfile\n");
1513                         create_pack_file(&have_obj, &want_obj);
1514                         state = FETCH_DONE;
1515                         break;
1516                 case FETCH_DONE:
1517                         continue;
1518                 }
1519         }
1520
1521         upload_pack_data_clear(&data);
1522         object_array_clear(&have_obj);
1523         object_array_clear(&want_obj);
1524         return 0;
1525 }
1526
1527 int upload_pack_advertise(struct repository *r,
1528                           struct strbuf *value)
1529 {
1530         if (value) {
1531                 int allow_filter_value;
1532                 int allow_ref_in_want;
1533                 int allow_sideband_all_value;
1534
1535                 strbuf_addstr(value, "shallow");
1536
1537                 if (!repo_config_get_bool(the_repository,
1538                                          "uploadpack.allowfilter",
1539                                          &allow_filter_value) &&
1540                     allow_filter_value)
1541                         strbuf_addstr(value, " filter");
1542
1543                 if (!repo_config_get_bool(the_repository,
1544                                          "uploadpack.allowrefinwant",
1545                                          &allow_ref_in_want) &&
1546                     allow_ref_in_want)
1547                         strbuf_addstr(value, " ref-in-want");
1548
1549                 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1550                     (!repo_config_get_bool(the_repository,
1551                                            "uploadpack.allowsidebandall",
1552                                            &allow_sideband_all_value) &&
1553                      allow_sideband_all_value))
1554                         strbuf_addstr(value, " sideband-all");
1555         }
1556
1557         return 1;
1558 }