upload-pack: pass upload_pack_data to send_ref()
[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 #include "shallow.h"
30
31 /* Remember to update object flag allocation in object.h */
32 #define THEY_HAVE       (1u << 11)
33 #define OUR_REF         (1u << 12)
34 #define WANTED          (1u << 13)
35 #define COMMON_KNOWN    (1u << 14)
36
37 #define SHALLOW         (1u << 16)
38 #define NOT_SHALLOW     (1u << 17)
39 #define CLIENT_SHALLOW  (1u << 18)
40 #define HIDDEN_REF      (1u << 19)
41
42 #define ALL_FLAGS (THEY_HAVE | OUR_REF | WANTED | COMMON_KNOWN | SHALLOW | \
43                 NOT_SHALLOW | CLIENT_SHALLOW | HIDDEN_REF)
44
45 static timestamp_t oldest_have;
46
47 static int multi_ack;
48 static int no_done;
49 static int use_thin_pack, use_ofs_delta, use_include_tag;
50 static int no_progress, daemon_mode;
51 /* Allow specifying sha1 if it is a ref tip. */
52 #define ALLOW_TIP_SHA1  01
53 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
54 #define ALLOW_REACHABLE_SHA1    02
55 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
56 #define ALLOW_ANY_SHA1  07
57 static unsigned int allow_unadvertised_object_request;
58 static int shallow_nr;
59 static struct object_array extra_edge_obj;
60 static unsigned int timeout;
61 static int keepalive = 5;
62 /* 0 for no sideband,
63  * otherwise maximum packet size (up to 65520 bytes).
64  */
65 static int use_sideband;
66 static int stateless_rpc;
67 static const char *pack_objects_hook;
68
69 static int filter_capability_requested;
70 static int allow_filter;
71 static int allow_ref_in_want;
72
73 static int allow_sideband_all;
74
75 struct upload_pack_data {
76         struct string_list symref;
77         struct string_list wanted_refs;
78         struct object_array want_obj;
79         struct object_array have_obj;
80         struct oid_array haves;
81
82         struct object_array shallows;
83         struct string_list deepen_not;
84         int depth;
85         timestamp_t deepen_since;
86         int deepen_rev_list;
87         int deepen_relative;
88
89         struct list_objects_filter_options filter_options;
90
91         struct packet_writer writer;
92
93         unsigned stateless_rpc : 1;
94
95         unsigned use_thin_pack : 1;
96         unsigned use_ofs_delta : 1;
97         unsigned no_progress : 1;
98         unsigned use_include_tag : 1;
99         unsigned done : 1;
100 };
101
102 static void upload_pack_data_init(struct upload_pack_data *data)
103 {
104         struct string_list symref = STRING_LIST_INIT_DUP;
105         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
106         struct object_array want_obj = OBJECT_ARRAY_INIT;
107         struct object_array have_obj = OBJECT_ARRAY_INIT;
108         struct oid_array haves = OID_ARRAY_INIT;
109         struct object_array shallows = OBJECT_ARRAY_INIT;
110         struct string_list deepen_not = STRING_LIST_INIT_DUP;
111
112         memset(data, 0, sizeof(*data));
113         data->symref = symref;
114         data->wanted_refs = wanted_refs;
115         data->want_obj = want_obj;
116         data->have_obj = have_obj;
117         data->haves = haves;
118         data->shallows = shallows;
119         data->deepen_not = deepen_not;
120         packet_writer_init(&data->writer, 1);
121 }
122
123 static void upload_pack_data_clear(struct upload_pack_data *data)
124 {
125         string_list_clear(&data->symref, 1);
126         string_list_clear(&data->wanted_refs, 1);
127         object_array_clear(&data->want_obj);
128         object_array_clear(&data->have_obj);
129         oid_array_clear(&data->haves);
130         object_array_clear(&data->shallows);
131         string_list_clear(&data->deepen_not, 0);
132         list_objects_filter_release(&data->filter_options);
133 }
134
135 static void reset_timeout(void)
136 {
137         alarm(timeout);
138 }
139
140 static void send_client_data(int fd, const char *data, ssize_t sz)
141 {
142         if (use_sideband) {
143                 send_sideband(1, fd, data, sz, use_sideband);
144                 return;
145         }
146         if (fd == 3)
147                 /* emergency quit */
148                 fd = 2;
149         if (fd == 2) {
150                 /* XXX: are we happy to lose stuff here? */
151                 xwrite(fd, data, sz);
152                 return;
153         }
154         write_or_die(fd, data, sz);
155 }
156
157 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
158 {
159         FILE *fp = cb_data;
160         if (graft->nr_parent == -1)
161                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
162         return 0;
163 }
164
165 static void create_pack_file(const struct object_array *have_obj,
166                              const struct object_array *want_obj,
167                              struct list_objects_filter_options *filter_options)
168 {
169         struct child_process pack_objects = CHILD_PROCESS_INIT;
170         char data[8193], progress[128];
171         char abort_msg[] = "aborting due to possible repository "
172                 "corruption on the remote side.";
173         int buffered = -1;
174         ssize_t sz;
175         int i;
176         FILE *pipe_fd;
177
178         if (!pack_objects_hook)
179                 pack_objects.git_cmd = 1;
180         else {
181                 argv_array_push(&pack_objects.args, pack_objects_hook);
182                 argv_array_push(&pack_objects.args, "git");
183                 pack_objects.use_shell = 1;
184         }
185
186         if (shallow_nr) {
187                 argv_array_push(&pack_objects.args, "--shallow-file");
188                 argv_array_push(&pack_objects.args, "");
189         }
190         argv_array_push(&pack_objects.args, "pack-objects");
191         argv_array_push(&pack_objects.args, "--revs");
192         if (use_thin_pack)
193                 argv_array_push(&pack_objects.args, "--thin");
194
195         argv_array_push(&pack_objects.args, "--stdout");
196         if (shallow_nr)
197                 argv_array_push(&pack_objects.args, "--shallow");
198         if (!no_progress)
199                 argv_array_push(&pack_objects.args, "--progress");
200         if (use_ofs_delta)
201                 argv_array_push(&pack_objects.args, "--delta-base-offset");
202         if (use_include_tag)
203                 argv_array_push(&pack_objects.args, "--include-tag");
204         if (filter_options->choice) {
205                 const char *spec =
206                         expand_list_objects_filter_spec(filter_options);
207                 if (pack_objects.use_shell) {
208                         struct strbuf buf = STRBUF_INIT;
209                         sq_quote_buf(&buf, spec);
210                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
211                         strbuf_release(&buf);
212                 } else {
213                         argv_array_pushf(&pack_objects.args, "--filter=%s",
214                                          spec);
215                 }
216         }
217
218         pack_objects.in = -1;
219         pack_objects.out = -1;
220         pack_objects.err = -1;
221
222         if (start_command(&pack_objects))
223                 die("git upload-pack: unable to fork git-pack-objects");
224
225         pipe_fd = xfdopen(pack_objects.in, "w");
226
227         if (shallow_nr)
228                 for_each_commit_graft(write_one_shallow, pipe_fd);
229
230         for (i = 0; i < want_obj->nr; i++)
231                 fprintf(pipe_fd, "%s\n",
232                         oid_to_hex(&want_obj->objects[i].item->oid));
233         fprintf(pipe_fd, "--not\n");
234         for (i = 0; i < have_obj->nr; i++)
235                 fprintf(pipe_fd, "%s\n",
236                         oid_to_hex(&have_obj->objects[i].item->oid));
237         for (i = 0; i < extra_edge_obj.nr; i++)
238                 fprintf(pipe_fd, "%s\n",
239                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
240         fprintf(pipe_fd, "\n");
241         fflush(pipe_fd);
242         fclose(pipe_fd);
243
244         /* We read from pack_objects.err to capture stderr output for
245          * progress bar, and pack_objects.out to capture the pack data.
246          */
247
248         while (1) {
249                 struct pollfd pfd[2];
250                 int pe, pu, pollsize;
251                 int ret;
252
253                 reset_timeout();
254
255                 pollsize = 0;
256                 pe = pu = -1;
257
258                 if (0 <= pack_objects.out) {
259                         pfd[pollsize].fd = pack_objects.out;
260                         pfd[pollsize].events = POLLIN;
261                         pu = pollsize;
262                         pollsize++;
263                 }
264                 if (0 <= pack_objects.err) {
265                         pfd[pollsize].fd = pack_objects.err;
266                         pfd[pollsize].events = POLLIN;
267                         pe = pollsize;
268                         pollsize++;
269                 }
270
271                 if (!pollsize)
272                         break;
273
274                 ret = poll(pfd, pollsize,
275                         keepalive < 0 ? -1 : 1000 * keepalive);
276
277                 if (ret < 0) {
278                         if (errno != EINTR) {
279                                 error_errno("poll failed, resuming");
280                                 sleep(1);
281                         }
282                         continue;
283                 }
284                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
285                         /* Status ready; we ship that in the side-band
286                          * or dump to the standard error.
287                          */
288                         sz = xread(pack_objects.err, progress,
289                                   sizeof(progress));
290                         if (0 < sz)
291                                 send_client_data(2, progress, sz);
292                         else if (sz == 0) {
293                                 close(pack_objects.err);
294                                 pack_objects.err = -1;
295                         }
296                         else
297                                 goto fail;
298                         /* give priority to status messages */
299                         continue;
300                 }
301                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
302                         /* Data ready; we keep the last byte to ourselves
303                          * in case we detect broken rev-list, so that we
304                          * can leave the stream corrupted.  This is
305                          * unfortunate -- unpack-objects would happily
306                          * accept a valid packdata with trailing garbage,
307                          * so appending garbage after we pass all the
308                          * pack data is not good enough to signal
309                          * breakage to downstream.
310                          */
311                         char *cp = data;
312                         ssize_t outsz = 0;
313                         if (0 <= buffered) {
314                                 *cp++ = buffered;
315                                 outsz++;
316                         }
317                         sz = xread(pack_objects.out, cp,
318                                   sizeof(data) - outsz);
319                         if (0 < sz)
320                                 ;
321                         else if (sz == 0) {
322                                 close(pack_objects.out);
323                                 pack_objects.out = -1;
324                         }
325                         else
326                                 goto fail;
327                         sz += outsz;
328                         if (1 < sz) {
329                                 buffered = data[sz-1] & 0xFF;
330                                 sz--;
331                         }
332                         else
333                                 buffered = -1;
334                         send_client_data(1, data, sz);
335                 }
336
337                 /*
338                  * We hit the keepalive timeout without saying anything; send
339                  * an empty message on the data sideband just to let the other
340                  * side know we're still working on it, but don't have any data
341                  * yet.
342                  *
343                  * If we don't have a sideband channel, there's no room in the
344                  * protocol to say anything, so those clients are just out of
345                  * luck.
346                  */
347                 if (!ret && use_sideband) {
348                         static const char buf[] = "0005\1";
349                         write_or_die(1, buf, 5);
350                 }
351         }
352
353         if (finish_command(&pack_objects)) {
354                 error("git upload-pack: git-pack-objects died with error.");
355                 goto fail;
356         }
357
358         /* flush the data */
359         if (0 <= buffered) {
360                 data[0] = buffered;
361                 send_client_data(1, data, 1);
362                 fprintf(stderr, "flushed.\n");
363         }
364         if (use_sideband)
365                 packet_flush(1);
366         return;
367
368  fail:
369         send_client_data(3, abort_msg, sizeof(abort_msg));
370         die("git upload-pack: %s", abort_msg);
371 }
372
373 static int got_oid(const char *hex, struct object_id *oid,
374                    struct object_array *have_obj)
375 {
376         struct object *o;
377         int we_knew_they_have = 0;
378
379         if (get_oid_hex(hex, oid))
380                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
381         if (!has_object_file(oid))
382                 return -1;
383
384         o = parse_object(the_repository, oid);
385         if (!o)
386                 die("oops (%s)", oid_to_hex(oid));
387         if (o->type == OBJ_COMMIT) {
388                 struct commit_list *parents;
389                 struct commit *commit = (struct commit *)o;
390                 if (o->flags & THEY_HAVE)
391                         we_knew_they_have = 1;
392                 else
393                         o->flags |= THEY_HAVE;
394                 if (!oldest_have || (commit->date < oldest_have))
395                         oldest_have = commit->date;
396                 for (parents = commit->parents;
397                      parents;
398                      parents = parents->next)
399                         parents->item->object.flags |= THEY_HAVE;
400         }
401         if (!we_knew_they_have) {
402                 add_object_array(o, NULL, have_obj);
403                 return 1;
404         }
405         return 0;
406 }
407
408 static int ok_to_give_up(const struct object_array *have_obj,
409                          struct object_array *want_obj)
410 {
411         uint32_t min_generation = GENERATION_NUMBER_ZERO;
412
413         if (!have_obj->nr)
414                 return 0;
415
416         return can_all_from_reach_with_flag(want_obj, THEY_HAVE,
417                                             COMMON_KNOWN, oldest_have,
418                                             min_generation);
419 }
420
421 static int get_common_commits(struct upload_pack_data *data,
422                               struct packet_reader *reader)
423 {
424         struct object_id oid;
425         char last_hex[GIT_MAX_HEXSZ + 1];
426         int got_common = 0;
427         int got_other = 0;
428         int sent_ready = 0;
429
430         save_commit_buffer = 0;
431
432         for (;;) {
433                 const char *arg;
434
435                 reset_timeout();
436
437                 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
438                         if (multi_ack == 2
439                             && got_common
440                             && !got_other
441                             && ok_to_give_up(&data->have_obj, &data->want_obj)) {
442                                 sent_ready = 1;
443                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
444                         }
445                         if (data->have_obj.nr == 0 || multi_ack)
446                                 packet_write_fmt(1, "NAK\n");
447
448                         if (no_done && sent_ready) {
449                                 packet_write_fmt(1, "ACK %s\n", last_hex);
450                                 return 0;
451                         }
452                         if (stateless_rpc)
453                                 exit(0);
454                         got_common = 0;
455                         got_other = 0;
456                         continue;
457                 }
458                 if (skip_prefix(reader->line, "have ", &arg)) {
459                         switch (got_oid(arg, &oid, &data->have_obj)) {
460                         case -1: /* they have what we do not */
461                                 got_other = 1;
462                                 if (multi_ack
463                                     && ok_to_give_up(&data->have_obj, &data->want_obj)) {
464                                         const char *hex = oid_to_hex(&oid);
465                                         if (multi_ack == 2) {
466                                                 sent_ready = 1;
467                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
468                                         } else
469                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
470                                 }
471                                 break;
472                         default:
473                                 got_common = 1;
474                                 oid_to_hex_r(last_hex, &oid);
475                                 if (multi_ack == 2)
476                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
477                                 else if (multi_ack)
478                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
479                                 else if (data->have_obj.nr == 1)
480                                         packet_write_fmt(1, "ACK %s\n", last_hex);
481                                 break;
482                         }
483                         continue;
484                 }
485                 if (!strcmp(reader->line, "done")) {
486                         if (data->have_obj.nr > 0) {
487                                 if (multi_ack)
488                                         packet_write_fmt(1, "ACK %s\n", last_hex);
489                                 return 0;
490                         }
491                         packet_write_fmt(1, "NAK\n");
492                         return -1;
493                 }
494                 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
495         }
496 }
497
498 static int is_our_ref(struct object *o)
499 {
500         int allow_hidden_ref = (allow_unadvertised_object_request &
501                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
502         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
503 }
504
505 /*
506  * on successful case, it's up to the caller to close cmd->out
507  */
508 static int do_reachable_revlist(struct child_process *cmd,
509                                 struct object_array *src,
510                                 struct object_array *reachable)
511 {
512         static const char *argv[] = {
513                 "rev-list", "--stdin", NULL,
514         };
515         struct object *o;
516         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
517         int i;
518         const unsigned hexsz = the_hash_algo->hexsz;
519
520         cmd->argv = argv;
521         cmd->git_cmd = 1;
522         cmd->no_stderr = 1;
523         cmd->in = -1;
524         cmd->out = -1;
525
526         /*
527          * If the next rev-list --stdin encounters an unknown commit,
528          * it terminates, which will cause SIGPIPE in the write loop
529          * below.
530          */
531         sigchain_push(SIGPIPE, SIG_IGN);
532
533         if (start_command(cmd))
534                 goto error;
535
536         namebuf[0] = '^';
537         namebuf[hexsz + 1] = '\n';
538         for (i = get_max_object_index(); 0 < i; ) {
539                 o = get_indexed_object(--i);
540                 if (!o)
541                         continue;
542                 if (reachable && o->type == OBJ_COMMIT)
543                         o->flags &= ~TMP_MARK;
544                 if (!is_our_ref(o))
545                         continue;
546                 memcpy(namebuf + 1, oid_to_hex(&o->oid), hexsz);
547                 if (write_in_full(cmd->in, namebuf, hexsz + 2) < 0)
548                         goto error;
549         }
550         namebuf[hexsz] = '\n';
551         for (i = 0; i < src->nr; i++) {
552                 o = src->objects[i].item;
553                 if (is_our_ref(o)) {
554                         if (reachable)
555                                 add_object_array(o, NULL, reachable);
556                         continue;
557                 }
558                 if (reachable && o->type == OBJ_COMMIT)
559                         o->flags |= TMP_MARK;
560                 memcpy(namebuf, oid_to_hex(&o->oid), hexsz);
561                 if (write_in_full(cmd->in, namebuf, hexsz + 1) < 0)
562                         goto error;
563         }
564         close(cmd->in);
565         cmd->in = -1;
566         sigchain_pop(SIGPIPE);
567
568         return 0;
569
570 error:
571         sigchain_pop(SIGPIPE);
572
573         if (cmd->in >= 0)
574                 close(cmd->in);
575         if (cmd->out >= 0)
576                 close(cmd->out);
577         return -1;
578 }
579
580 static int get_reachable_list(struct object_array *src,
581                               struct object_array *reachable)
582 {
583         struct child_process cmd = CHILD_PROCESS_INIT;
584         int i;
585         struct object *o;
586         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
587         const unsigned hexsz = the_hash_algo->hexsz;
588
589         if (do_reachable_revlist(&cmd, src, reachable) < 0)
590                 return -1;
591
592         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
593                 struct object_id oid;
594                 const char *p;
595
596                 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
597                         break;
598
599                 o = lookup_object(the_repository, &oid);
600                 if (o && o->type == OBJ_COMMIT) {
601                         o->flags &= ~TMP_MARK;
602                 }
603         }
604         for (i = get_max_object_index(); 0 < i; i--) {
605                 o = get_indexed_object(i - 1);
606                 if (o && o->type == OBJ_COMMIT &&
607                     (o->flags & TMP_MARK)) {
608                         add_object_array(o, NULL, reachable);
609                                 o->flags &= ~TMP_MARK;
610                 }
611         }
612         close(cmd.out);
613
614         if (finish_command(&cmd))
615                 return -1;
616
617         return 0;
618 }
619
620 static int has_unreachable(struct object_array *src)
621 {
622         struct child_process cmd = CHILD_PROCESS_INIT;
623         char buf[1];
624         int i;
625
626         if (do_reachable_revlist(&cmd, src, NULL) < 0)
627                 return 1;
628
629         /*
630          * The commits out of the rev-list are not ancestors of
631          * our ref.
632          */
633         i = read_in_full(cmd.out, buf, 1);
634         if (i)
635                 goto error;
636         close(cmd.out);
637         cmd.out = -1;
638
639         /*
640          * rev-list may have died by encountering a bad commit
641          * in the history, in which case we do want to bail out
642          * even when it showed no commit.
643          */
644         if (finish_command(&cmd))
645                 goto error;
646
647         /* All the non-tip ones are ancestors of what we advertised */
648         return 0;
649
650 error:
651         sigchain_pop(SIGPIPE);
652         if (cmd.out >= 0)
653                 close(cmd.out);
654         return 1;
655 }
656
657 static void check_non_tip(struct object_array *want_obj,
658                           struct packet_writer *writer)
659 {
660         int i;
661
662         /*
663          * In the normal in-process case without
664          * uploadpack.allowReachableSHA1InWant,
665          * non-tip requests can never happen.
666          */
667         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
668                 goto error;
669         if (!has_unreachable(want_obj))
670                 /* All the non-tip ones are ancestors of what we advertised */
671                 return;
672
673 error:
674         /* Pick one of them (we know there at least is one) */
675         for (i = 0; i < want_obj->nr; i++) {
676                 struct object *o = want_obj->objects[i].item;
677                 if (!is_our_ref(o)) {
678                         packet_writer_error(writer,
679                                             "upload-pack: not our ref %s",
680                                             oid_to_hex(&o->oid));
681                         die("git upload-pack: not our ref %s",
682                             oid_to_hex(&o->oid));
683                 }
684         }
685 }
686
687 static void send_shallow(struct packet_writer *writer,
688                          struct commit_list *result)
689 {
690         while (result) {
691                 struct object *object = &result->item->object;
692                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
693                         packet_writer_write(writer, "shallow %s",
694                                             oid_to_hex(&object->oid));
695                         register_shallow(the_repository, &object->oid);
696                         shallow_nr++;
697                 }
698                 result = result->next;
699         }
700 }
701
702 static void send_unshallow(struct packet_writer *writer,
703                            const struct object_array *shallows,
704                            struct object_array *want_obj)
705 {
706         int i;
707
708         for (i = 0; i < shallows->nr; i++) {
709                 struct object *object = shallows->objects[i].item;
710                 if (object->flags & NOT_SHALLOW) {
711                         struct commit_list *parents;
712                         packet_writer_write(writer, "unshallow %s",
713                                             oid_to_hex(&object->oid));
714                         object->flags &= ~CLIENT_SHALLOW;
715                         /*
716                          * We want to _register_ "object" as shallow, but we
717                          * also need to traverse object's parents to deepen a
718                          * shallow clone. Unregister it for now so we can
719                          * parse and add the parents to the want list, then
720                          * re-register it.
721                          */
722                         unregister_shallow(&object->oid);
723                         object->parsed = 0;
724                         parse_commit_or_die((struct commit *)object);
725                         parents = ((struct commit *)object)->parents;
726                         while (parents) {
727                                 add_object_array(&parents->item->object,
728                                                  NULL, want_obj);
729                                 parents = parents->next;
730                         }
731                         add_object_array(object, NULL, &extra_edge_obj);
732                 }
733                 /* make sure commit traversal conforms to client */
734                 register_shallow(the_repository, &object->oid);
735         }
736 }
737
738 static int check_ref(const char *refname_full, const struct object_id *oid,
739                      int flag, void *cb_data);
740 static void deepen(struct packet_writer *writer, int depth, int deepen_relative,
741                    struct object_array *shallows, struct object_array *want_obj)
742 {
743         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
744                 int i;
745
746                 for (i = 0; i < shallows->nr; i++) {
747                         struct object *object = shallows->objects[i].item;
748                         object->flags |= NOT_SHALLOW;
749                 }
750         } else if (deepen_relative) {
751                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
752                 struct commit_list *result;
753
754                 /*
755                  * Checking for reachable shallows requires that our refs be
756                  * marked with OUR_REF.
757                  */
758                 head_ref_namespaced(check_ref, NULL);
759                 for_each_namespaced_ref(check_ref, NULL);
760
761                 get_reachable_list(shallows, &reachable_shallows);
762                 result = get_shallow_commits(&reachable_shallows,
763                                              depth + 1,
764                                              SHALLOW, NOT_SHALLOW);
765                 send_shallow(writer, result);
766                 free_commit_list(result);
767                 object_array_clear(&reachable_shallows);
768         } else {
769                 struct commit_list *result;
770
771                 result = get_shallow_commits(want_obj, depth,
772                                              SHALLOW, NOT_SHALLOW);
773                 send_shallow(writer, result);
774                 free_commit_list(result);
775         }
776
777         send_unshallow(writer, shallows, want_obj);
778 }
779
780 static void deepen_by_rev_list(struct packet_writer *writer, int ac,
781                                const char **av,
782                                struct object_array *shallows,
783                                struct object_array *want_obj)
784 {
785         struct commit_list *result;
786
787         disable_commit_graph(the_repository);
788         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
789         send_shallow(writer, result);
790         free_commit_list(result);
791         send_unshallow(writer, shallows, want_obj);
792 }
793
794 /* Returns 1 if a shallow list is sent or 0 otherwise */
795 static int send_shallow_list(struct packet_writer *writer,
796                              int depth, int deepen_rev_list,
797                              timestamp_t deepen_since,
798                              struct string_list *deepen_not,
799                              int deepen_relative,
800                              struct object_array *shallows,
801                              struct object_array *want_obj)
802 {
803         int ret = 0;
804
805         if (depth > 0 && deepen_rev_list)
806                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
807         if (depth > 0) {
808                 deepen(writer, depth, deepen_relative, shallows, want_obj);
809                 ret = 1;
810         } else if (deepen_rev_list) {
811                 struct argv_array av = ARGV_ARRAY_INIT;
812                 int i;
813
814                 argv_array_push(&av, "rev-list");
815                 if (deepen_since)
816                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
817                 if (deepen_not->nr) {
818                         argv_array_push(&av, "--not");
819                         for (i = 0; i < deepen_not->nr; i++) {
820                                 struct string_list_item *s = deepen_not->items + i;
821                                 argv_array_push(&av, s->string);
822                         }
823                         argv_array_push(&av, "--not");
824                 }
825                 for (i = 0; i < want_obj->nr; i++) {
826                         struct object *o = want_obj->objects[i].item;
827                         argv_array_push(&av, oid_to_hex(&o->oid));
828                 }
829                 deepen_by_rev_list(writer, av.argc, av.argv, shallows, want_obj);
830                 argv_array_clear(&av);
831                 ret = 1;
832         } else {
833                 if (shallows->nr > 0) {
834                         int i;
835                         for (i = 0; i < shallows->nr; i++)
836                                 register_shallow(the_repository,
837                                                  &shallows->objects[i].item->oid);
838                 }
839         }
840
841         shallow_nr += shallows->nr;
842         return ret;
843 }
844
845 static int process_shallow(const char *line, struct object_array *shallows)
846 {
847         const char *arg;
848         if (skip_prefix(line, "shallow ", &arg)) {
849                 struct object_id oid;
850                 struct object *object;
851                 if (get_oid_hex(arg, &oid))
852                         die("invalid shallow line: %s", line);
853                 object = parse_object(the_repository, &oid);
854                 if (!object)
855                         return 1;
856                 if (object->type != OBJ_COMMIT)
857                         die("invalid shallow object %s", oid_to_hex(&oid));
858                 if (!(object->flags & CLIENT_SHALLOW)) {
859                         object->flags |= CLIENT_SHALLOW;
860                         add_object_array(object, NULL, shallows);
861                 }
862                 return 1;
863         }
864
865         return 0;
866 }
867
868 static int process_deepen(const char *line, int *depth)
869 {
870         const char *arg;
871         if (skip_prefix(line, "deepen ", &arg)) {
872                 char *end = NULL;
873                 *depth = (int)strtol(arg, &end, 0);
874                 if (!end || *end || *depth <= 0)
875                         die("Invalid deepen: %s", line);
876                 return 1;
877         }
878
879         return 0;
880 }
881
882 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
883 {
884         const char *arg;
885         if (skip_prefix(line, "deepen-since ", &arg)) {
886                 char *end = NULL;
887                 *deepen_since = parse_timestamp(arg, &end, 0);
888                 if (!end || *end || !deepen_since ||
889                     /* revisions.c's max_age -1 is special */
890                     *deepen_since == -1)
891                         die("Invalid deepen-since: %s", line);
892                 *deepen_rev_list = 1;
893                 return 1;
894         }
895         return 0;
896 }
897
898 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
899 {
900         const char *arg;
901         if (skip_prefix(line, "deepen-not ", &arg)) {
902                 char *ref = NULL;
903                 struct object_id oid;
904                 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
905                         die("git upload-pack: ambiguous deepen-not: %s", line);
906                 string_list_append(deepen_not, ref);
907                 free(ref);
908                 *deepen_rev_list = 1;
909                 return 1;
910         }
911         return 0;
912 }
913
914 static void receive_needs(struct upload_pack_data *data,
915                           struct packet_reader *reader)
916 {
917         struct object_array shallows = OBJECT_ARRAY_INIT;
918         struct string_list deepen_not = STRING_LIST_INIT_DUP;
919         int depth = 0;
920         int has_non_tip = 0;
921         timestamp_t deepen_since = 0;
922         int deepen_rev_list = 0;
923         int deepen_relative = 0;
924
925         shallow_nr = 0;
926         for (;;) {
927                 struct object *o;
928                 const char *features;
929                 struct object_id oid_buf;
930                 const char *arg;
931
932                 reset_timeout();
933                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
934                         break;
935
936                 if (process_shallow(reader->line, &shallows))
937                         continue;
938                 if (process_deepen(reader->line, &depth))
939                         continue;
940                 if (process_deepen_since(reader->line, &deepen_since, &deepen_rev_list))
941                         continue;
942                 if (process_deepen_not(reader->line, &deepen_not, &deepen_rev_list))
943                         continue;
944
945                 if (skip_prefix(reader->line, "filter ", &arg)) {
946                         if (!filter_capability_requested)
947                                 die("git upload-pack: filtering capability not negotiated");
948                         list_objects_filter_die_if_populated(&data->filter_options);
949                         parse_list_objects_filter(&data->filter_options, arg);
950                         continue;
951                 }
952
953                 if (!skip_prefix(reader->line, "want ", &arg) ||
954                     parse_oid_hex(arg, &oid_buf, &features))
955                         die("git upload-pack: protocol error, "
956                             "expected to get object ID, not '%s'", reader->line);
957
958                 if (parse_feature_request(features, "deepen-relative"))
959                         deepen_relative = 1;
960                 if (parse_feature_request(features, "multi_ack_detailed"))
961                         multi_ack = 2;
962                 else if (parse_feature_request(features, "multi_ack"))
963                         multi_ack = 1;
964                 if (parse_feature_request(features, "no-done"))
965                         no_done = 1;
966                 if (parse_feature_request(features, "thin-pack"))
967                         use_thin_pack = 1;
968                 if (parse_feature_request(features, "ofs-delta"))
969                         use_ofs_delta = 1;
970                 if (parse_feature_request(features, "side-band-64k"))
971                         use_sideband = LARGE_PACKET_MAX;
972                 else if (parse_feature_request(features, "side-band"))
973                         use_sideband = DEFAULT_PACKET_MAX;
974                 if (parse_feature_request(features, "no-progress"))
975                         no_progress = 1;
976                 if (parse_feature_request(features, "include-tag"))
977                         use_include_tag = 1;
978                 if (allow_filter && parse_feature_request(features, "filter"))
979                         filter_capability_requested = 1;
980
981                 o = parse_object(the_repository, &oid_buf);
982                 if (!o) {
983                         packet_writer_error(&data->writer,
984                                             "upload-pack: not our ref %s",
985                                             oid_to_hex(&oid_buf));
986                         die("git upload-pack: not our ref %s",
987                             oid_to_hex(&oid_buf));
988                 }
989                 if (!(o->flags & WANTED)) {
990                         o->flags |= WANTED;
991                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
992                               || is_our_ref(o)))
993                                 has_non_tip = 1;
994                         add_object_array(o, NULL, &data->want_obj);
995                 }
996         }
997
998         /*
999          * We have sent all our refs already, and the other end
1000          * should have chosen out of them. When we are operating
1001          * in the stateless RPC mode, however, their choice may
1002          * have been based on the set of older refs advertised
1003          * by another process that handled the initial request.
1004          */
1005         if (has_non_tip)
1006                 check_non_tip(&data->want_obj, &data->writer);
1007
1008         if (!use_sideband && daemon_mode)
1009                 no_progress = 1;
1010
1011         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
1012                 return;
1013
1014         if (send_shallow_list(&data->writer, depth, deepen_rev_list, deepen_since,
1015                               &deepen_not, deepen_relative, &shallows,
1016                               &data->want_obj))
1017                 packet_flush(1);
1018         object_array_clear(&shallows);
1019 }
1020
1021 /* return non-zero if the ref is hidden, otherwise 0 */
1022 static int mark_our_ref(const char *refname, const char *refname_full,
1023                         const struct object_id *oid)
1024 {
1025         struct object *o = lookup_unknown_object(oid);
1026
1027         if (ref_is_hidden(refname, refname_full)) {
1028                 o->flags |= HIDDEN_REF;
1029                 return 1;
1030         }
1031         o->flags |= OUR_REF;
1032         return 0;
1033 }
1034
1035 static int check_ref(const char *refname_full, const struct object_id *oid,
1036                      int flag, void *cb_data)
1037 {
1038         const char *refname = strip_namespace(refname_full);
1039
1040         mark_our_ref(refname, refname_full, oid);
1041         return 0;
1042 }
1043
1044 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1045 {
1046         struct string_list_item *item;
1047
1048         if (!symref->nr)
1049                 return;
1050         for_each_string_list_item(item, symref)
1051                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1052 }
1053
1054 static int send_ref(const char *refname, const struct object_id *oid,
1055                     int flag, void *cb_data)
1056 {
1057         static const char *capabilities = "multi_ack thin-pack side-band"
1058                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1059                 " deepen-relative no-progress include-tag multi_ack_detailed";
1060         const char *refname_nons = strip_namespace(refname);
1061         struct object_id peeled;
1062         struct upload_pack_data *data = cb_data;
1063
1064         if (mark_our_ref(refname_nons, refname, oid))
1065                 return 0;
1066
1067         if (capabilities) {
1068                 struct strbuf symref_info = STRBUF_INIT;
1069
1070                 format_symref_info(&symref_info, &data->symref);
1071                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
1072                              oid_to_hex(oid), refname_nons,
1073                              0, capabilities,
1074                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
1075                                      " allow-tip-sha1-in-want" : "",
1076                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
1077                                      " allow-reachable-sha1-in-want" : "",
1078                              stateless_rpc ? " no-done" : "",
1079                              symref_info.buf,
1080                              allow_filter ? " filter" : "",
1081                              git_user_agent_sanitized());
1082                 strbuf_release(&symref_info);
1083         } else {
1084                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1085         }
1086         capabilities = NULL;
1087         if (!peel_ref(refname, &peeled))
1088                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1089         return 0;
1090 }
1091
1092 static int find_symref(const char *refname, const struct object_id *oid,
1093                        int flag, void *cb_data)
1094 {
1095         const char *symref_target;
1096         struct string_list_item *item;
1097
1098         if ((flag & REF_ISSYMREF) == 0)
1099                 return 0;
1100         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1101         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1102                 die("'%s' is a symref but it is not?", refname);
1103         item = string_list_append(cb_data, strip_namespace(refname));
1104         item->util = xstrdup(strip_namespace(symref_target));
1105         return 0;
1106 }
1107
1108 static int upload_pack_config(const char *var, const char *value, void *unused)
1109 {
1110         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1111                 if (git_config_bool(var, value))
1112                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1113                 else
1114                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1115         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1116                 if (git_config_bool(var, value))
1117                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1118                 else
1119                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1120         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1121                 if (git_config_bool(var, value))
1122                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1123                 else
1124                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1125         } else if (!strcmp("uploadpack.keepalive", var)) {
1126                 keepalive = git_config_int(var, value);
1127                 if (!keepalive)
1128                         keepalive = -1;
1129         } else if (!strcmp("uploadpack.allowfilter", var)) {
1130                 allow_filter = git_config_bool(var, value);
1131         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1132                 allow_ref_in_want = git_config_bool(var, value);
1133         } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1134                 allow_sideband_all = git_config_bool(var, value);
1135         } else if (!strcmp("core.precomposeunicode", var)) {
1136                 precomposed_unicode = git_config_bool(var, value);
1137         }
1138
1139         if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
1140         current_config_scope() != CONFIG_SCOPE_WORKTREE) {
1141                 if (!strcmp("uploadpack.packobjectshook", var))
1142                         return git_config_string(&pack_objects_hook, var, value);
1143         }
1144
1145         return parse_hide_refs_config(var, value, "uploadpack");
1146 }
1147
1148 void upload_pack(struct upload_pack_options *options)
1149 {
1150         struct packet_reader reader;
1151         struct upload_pack_data data;
1152
1153         stateless_rpc = options->stateless_rpc;
1154         timeout = options->timeout;
1155         daemon_mode = options->daemon_mode;
1156
1157         git_config(upload_pack_config, NULL);
1158
1159         upload_pack_data_init(&data);
1160
1161         head_ref_namespaced(find_symref, &data.symref);
1162
1163         if (options->advertise_refs || !stateless_rpc) {
1164                 reset_timeout();
1165                 head_ref_namespaced(send_ref, &data);
1166                 for_each_namespaced_ref(send_ref, &data);
1167                 advertise_shallow_grafts(1);
1168                 packet_flush(1);
1169         } else {
1170                 head_ref_namespaced(check_ref, NULL);
1171                 for_each_namespaced_ref(check_ref, NULL);
1172         }
1173
1174         if (!options->advertise_refs) {
1175                 packet_reader_init(&reader, 0, NULL, 0,
1176                                    PACKET_READ_CHOMP_NEWLINE |
1177                                    PACKET_READ_DIE_ON_ERR_PACKET);
1178
1179                 receive_needs(&data, &reader);
1180                 if (data.want_obj.nr) {
1181                         get_common_commits(&data, &reader);
1182                         create_pack_file(&data.have_obj,
1183                                          &data.want_obj,
1184                                          &data.filter_options);
1185                 }
1186         }
1187
1188         upload_pack_data_clear(&data);
1189 }
1190
1191 static int parse_want(struct packet_writer *writer, const char *line,
1192                       struct object_array *want_obj)
1193 {
1194         const char *arg;
1195         if (skip_prefix(line, "want ", &arg)) {
1196                 struct object_id oid;
1197                 struct object *o;
1198
1199                 if (get_oid_hex(arg, &oid))
1200                         die("git upload-pack: protocol error, "
1201                             "expected to get oid, not '%s'", line);
1202
1203                 o = parse_object(the_repository, &oid);
1204                 if (!o) {
1205                         packet_writer_error(writer,
1206                                             "upload-pack: not our ref %s",
1207                                             oid_to_hex(&oid));
1208                         die("git upload-pack: not our ref %s",
1209                             oid_to_hex(&oid));
1210                 }
1211
1212                 if (!(o->flags & WANTED)) {
1213                         o->flags |= WANTED;
1214                         add_object_array(o, NULL, want_obj);
1215                 }
1216
1217                 return 1;
1218         }
1219
1220         return 0;
1221 }
1222
1223 static int parse_want_ref(struct packet_writer *writer, const char *line,
1224                           struct string_list *wanted_refs,
1225                           struct object_array *want_obj)
1226 {
1227         const char *arg;
1228         if (skip_prefix(line, "want-ref ", &arg)) {
1229                 struct object_id oid;
1230                 struct string_list_item *item;
1231                 struct object *o;
1232
1233                 if (read_ref(arg, &oid)) {
1234                         packet_writer_error(writer, "unknown ref %s", arg);
1235                         die("unknown ref %s", arg);
1236                 }
1237
1238                 item = string_list_append(wanted_refs, arg);
1239                 item->util = oiddup(&oid);
1240
1241                 o = parse_object_or_die(&oid, arg);
1242                 if (!(o->flags & WANTED)) {
1243                         o->flags |= WANTED;
1244                         add_object_array(o, NULL, want_obj);
1245                 }
1246
1247                 return 1;
1248         }
1249
1250         return 0;
1251 }
1252
1253 static int parse_have(const char *line, struct oid_array *haves)
1254 {
1255         const char *arg;
1256         if (skip_prefix(line, "have ", &arg)) {
1257                 struct object_id oid;
1258
1259                 if (get_oid_hex(arg, &oid))
1260                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1261                 oid_array_append(haves, &oid);
1262                 return 1;
1263         }
1264
1265         return 0;
1266 }
1267
1268 static void process_args(struct packet_reader *request,
1269                          struct upload_pack_data *data)
1270 {
1271         while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1272                 const char *arg = request->line;
1273                 const char *p;
1274
1275                 /* process want */
1276                 if (parse_want(&data->writer, arg, &data->want_obj))
1277                         continue;
1278                 if (allow_ref_in_want &&
1279                     parse_want_ref(&data->writer, arg, &data->wanted_refs,
1280                                    &data->want_obj))
1281                         continue;
1282                 /* process have line */
1283                 if (parse_have(arg, &data->haves))
1284                         continue;
1285
1286                 /* process args like thin-pack */
1287                 if (!strcmp(arg, "thin-pack")) {
1288                         use_thin_pack = 1;
1289                         continue;
1290                 }
1291                 if (!strcmp(arg, "ofs-delta")) {
1292                         use_ofs_delta = 1;
1293                         continue;
1294                 }
1295                 if (!strcmp(arg, "no-progress")) {
1296                         no_progress = 1;
1297                         continue;
1298                 }
1299                 if (!strcmp(arg, "include-tag")) {
1300                         use_include_tag = 1;
1301                         continue;
1302                 }
1303                 if (!strcmp(arg, "done")) {
1304                         data->done = 1;
1305                         continue;
1306                 }
1307
1308                 /* Shallow related arguments */
1309                 if (process_shallow(arg, &data->shallows))
1310                         continue;
1311                 if (process_deepen(arg, &data->depth))
1312                         continue;
1313                 if (process_deepen_since(arg, &data->deepen_since,
1314                                          &data->deepen_rev_list))
1315                         continue;
1316                 if (process_deepen_not(arg, &data->deepen_not,
1317                                        &data->deepen_rev_list))
1318                         continue;
1319                 if (!strcmp(arg, "deepen-relative")) {
1320                         data->deepen_relative = 1;
1321                         continue;
1322                 }
1323
1324                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1325                         list_objects_filter_die_if_populated(&data->filter_options);
1326                         parse_list_objects_filter(&data->filter_options, p);
1327                         continue;
1328                 }
1329
1330                 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1331                      allow_sideband_all) &&
1332                     !strcmp(arg, "sideband-all")) {
1333                         data->writer.use_sideband = 1;
1334                         continue;
1335                 }
1336
1337                 /* ignore unknown lines maybe? */
1338                 die("unexpected line: '%s'", arg);
1339         }
1340
1341         if (request->status != PACKET_READ_FLUSH)
1342                 die(_("expected flush after fetch arguments"));
1343 }
1344
1345 static int process_haves(struct oid_array *haves, struct oid_array *common,
1346                          struct object_array *have_obj)
1347 {
1348         int i;
1349
1350         /* Process haves */
1351         for (i = 0; i < haves->nr; i++) {
1352                 const struct object_id *oid = &haves->oid[i];
1353                 struct object *o;
1354                 int we_knew_they_have = 0;
1355
1356                 if (!has_object_file(oid))
1357                         continue;
1358
1359                 oid_array_append(common, oid);
1360
1361                 o = parse_object(the_repository, oid);
1362                 if (!o)
1363                         die("oops (%s)", oid_to_hex(oid));
1364                 if (o->type == OBJ_COMMIT) {
1365                         struct commit_list *parents;
1366                         struct commit *commit = (struct commit *)o;
1367                         if (o->flags & THEY_HAVE)
1368                                 we_knew_they_have = 1;
1369                         else
1370                                 o->flags |= THEY_HAVE;
1371                         if (!oldest_have || (commit->date < oldest_have))
1372                                 oldest_have = commit->date;
1373                         for (parents = commit->parents;
1374                              parents;
1375                              parents = parents->next)
1376                                 parents->item->object.flags |= THEY_HAVE;
1377                 }
1378                 if (!we_knew_they_have)
1379                         add_object_array(o, NULL, have_obj);
1380         }
1381
1382         return 0;
1383 }
1384
1385 static int send_acks(struct packet_writer *writer, struct oid_array *acks,
1386                      const struct object_array *have_obj,
1387                      struct object_array *want_obj)
1388 {
1389         int i;
1390
1391         packet_writer_write(writer, "acknowledgments\n");
1392
1393         /* Send Acks */
1394         if (!acks->nr)
1395                 packet_writer_write(writer, "NAK\n");
1396
1397         for (i = 0; i < acks->nr; i++) {
1398                 packet_writer_write(writer, "ACK %s\n",
1399                                     oid_to_hex(&acks->oid[i]));
1400         }
1401
1402         if (ok_to_give_up(have_obj, want_obj)) {
1403                 /* Send Ready */
1404                 packet_writer_write(writer, "ready\n");
1405                 return 1;
1406         }
1407
1408         return 0;
1409 }
1410
1411 static int process_haves_and_send_acks(struct upload_pack_data *data)
1412 {
1413         struct oid_array common = OID_ARRAY_INIT;
1414         int ret = 0;
1415
1416         process_haves(&data->haves, &common, &data->have_obj);
1417         if (data->done) {
1418                 ret = 1;
1419         } else if (send_acks(&data->writer, &common,
1420                              &data->have_obj, &data->want_obj)) {
1421                 packet_writer_delim(&data->writer);
1422                 ret = 1;
1423         } else {
1424                 /* Add Flush */
1425                 packet_writer_flush(&data->writer);
1426                 ret = 0;
1427         }
1428
1429         oid_array_clear(&data->haves);
1430         oid_array_clear(&common);
1431         return ret;
1432 }
1433
1434 static void send_wanted_ref_info(struct upload_pack_data *data)
1435 {
1436         const struct string_list_item *item;
1437
1438         if (!data->wanted_refs.nr)
1439                 return;
1440
1441         packet_writer_write(&data->writer, "wanted-refs\n");
1442
1443         for_each_string_list_item(item, &data->wanted_refs) {
1444                 packet_writer_write(&data->writer, "%s %s\n",
1445                                     oid_to_hex(item->util),
1446                                     item->string);
1447         }
1448
1449         packet_writer_delim(&data->writer);
1450 }
1451
1452 static void send_shallow_info(struct upload_pack_data *data)
1453 {
1454         /* No shallow info needs to be sent */
1455         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1456             !is_repository_shallow(the_repository))
1457                 return;
1458
1459         packet_writer_write(&data->writer, "shallow-info\n");
1460
1461         if (!send_shallow_list(&data->writer, data->depth,
1462                                data->deepen_rev_list,
1463                                data->deepen_since, &data->deepen_not,
1464                                data->deepen_relative,
1465                                &data->shallows, &data->want_obj) &&
1466             is_repository_shallow(the_repository))
1467                 deepen(&data->writer, INFINITE_DEPTH, data->deepen_relative,
1468                        &data->shallows, &data->want_obj);
1469
1470         packet_delim(1);
1471 }
1472
1473 enum fetch_state {
1474         FETCH_PROCESS_ARGS = 0,
1475         FETCH_SEND_ACKS,
1476         FETCH_SEND_PACK,
1477         FETCH_DONE,
1478 };
1479
1480 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1481                    struct packet_reader *request)
1482 {
1483         enum fetch_state state = FETCH_PROCESS_ARGS;
1484         struct upload_pack_data data;
1485
1486         clear_object_flags(ALL_FLAGS);
1487
1488         git_config(upload_pack_config, NULL);
1489
1490         upload_pack_data_init(&data);
1491         use_sideband = LARGE_PACKET_MAX;
1492
1493         while (state != FETCH_DONE) {
1494                 switch (state) {
1495                 case FETCH_PROCESS_ARGS:
1496                         process_args(request, &data);
1497
1498                         if (!data.want_obj.nr) {
1499                                 /*
1500                                  * Request didn't contain any 'want' lines,
1501                                  * guess they didn't want anything.
1502                                  */
1503                                 state = FETCH_DONE;
1504                         } else if (data.haves.nr) {
1505                                 /*
1506                                  * Request had 'have' lines, so lets ACK them.
1507                                  */
1508                                 state = FETCH_SEND_ACKS;
1509                         } else {
1510                                 /*
1511                                  * Request had 'want's but no 'have's so we can
1512                                  * immedietly go to construct and send a pack.
1513                                  */
1514                                 state = FETCH_SEND_PACK;
1515                         }
1516                         break;
1517                 case FETCH_SEND_ACKS:
1518                         if (process_haves_and_send_acks(&data))
1519                                 state = FETCH_SEND_PACK;
1520                         else
1521                                 state = FETCH_DONE;
1522                         break;
1523                 case FETCH_SEND_PACK:
1524                         send_wanted_ref_info(&data);
1525                         send_shallow_info(&data);
1526
1527                         packet_writer_write(&data.writer, "packfile\n");
1528                         create_pack_file(&data.have_obj,
1529                                          &data.want_obj,
1530                                          &data.filter_options);
1531                         state = FETCH_DONE;
1532                         break;
1533                 case FETCH_DONE:
1534                         continue;
1535                 }
1536         }
1537
1538         upload_pack_data_clear(&data);
1539         return 0;
1540 }
1541
1542 int upload_pack_advertise(struct repository *r,
1543                           struct strbuf *value)
1544 {
1545         if (value) {
1546                 int allow_filter_value;
1547                 int allow_ref_in_want;
1548                 int allow_sideband_all_value;
1549
1550                 strbuf_addstr(value, "shallow");
1551
1552                 if (!repo_config_get_bool(the_repository,
1553                                          "uploadpack.allowfilter",
1554                                          &allow_filter_value) &&
1555                     allow_filter_value)
1556                         strbuf_addstr(value, " filter");
1557
1558                 if (!repo_config_get_bool(the_repository,
1559                                          "uploadpack.allowrefinwant",
1560                                          &allow_ref_in_want) &&
1561                     allow_ref_in_want)
1562                         strbuf_addstr(value, " ref-in-want");
1563
1564                 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1565                     (!repo_config_get_bool(the_repository,
1566                                            "uploadpack.allowsidebandall",
1567                                            &allow_sideband_all_value) &&
1568                      allow_sideband_all_value))
1569                         strbuf_addstr(value, " sideband-all");
1570         }
1571
1572         return 1;
1573 }