Merge remote-tracking branch 'github/master' into git-po-master
[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 "strvec.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 /* Enum for allowed unadvertised object request (UOR) */
46 enum allow_uor {
47         /* Allow specifying sha1 if it is a ref tip. */
48         ALLOW_TIP_SHA1 = 0x01,
49         /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
50         ALLOW_REACHABLE_SHA1 = 0x02,
51         /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
52         ALLOW_ANY_SHA1 = 0x07
53 };
54
55 /*
56  * Please annotate, and if possible group together, fields used only
57  * for protocol v0 or only for protocol v2.
58  */
59 struct upload_pack_data {
60         struct string_list symref;                              /* v0 only */
61         struct object_array want_obj;
62         struct object_array have_obj;
63         struct oid_array haves;                                 /* v2 only */
64         struct string_list wanted_refs;                         /* v2 only */
65
66         struct object_array shallows;
67         struct string_list deepen_not;
68         struct object_array extra_edge_obj;
69         int depth;
70         timestamp_t deepen_since;
71         int deepen_rev_list;
72         int deepen_relative;
73         int keepalive;
74         int shallow_nr;
75         timestamp_t oldest_have;
76
77         unsigned int timeout;                                   /* v0 only */
78         enum {
79                 NO_MULTI_ACK = 0,
80                 MULTI_ACK = 1,
81                 MULTI_ACK_DETAILED = 2
82         } multi_ack;                                            /* v0 only */
83
84         /* 0 for no sideband, otherwise DEFAULT_PACKET_MAX or LARGE_PACKET_MAX */
85         int use_sideband;
86
87         struct string_list uri_protocols;
88         enum allow_uor allow_uor;
89
90         struct list_objects_filter_options filter_options;
91         struct string_list allowed_filters;
92
93         struct packet_writer writer;
94
95         const char *pack_objects_hook;
96
97         unsigned stateless_rpc : 1;                             /* v0 only */
98         unsigned no_done : 1;                                   /* v0 only */
99         unsigned daemon_mode : 1;                               /* v0 only */
100         unsigned filter_capability_requested : 1;               /* v0 only */
101
102         unsigned use_thin_pack : 1;
103         unsigned use_ofs_delta : 1;
104         unsigned no_progress : 1;
105         unsigned use_include_tag : 1;
106         unsigned allow_filter : 1;
107         unsigned allow_filter_fallback : 1;
108         unsigned long tree_filter_max_depth;
109
110         unsigned done : 1;                                      /* v2 only */
111         unsigned allow_ref_in_want : 1;                         /* v2 only */
112         unsigned allow_sideband_all : 1;                        /* v2 only */
113         unsigned advertise_sid : 1;
114 };
115
116 static void upload_pack_data_init(struct upload_pack_data *data)
117 {
118         struct string_list symref = STRING_LIST_INIT_DUP;
119         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
120         struct object_array want_obj = OBJECT_ARRAY_INIT;
121         struct object_array have_obj = OBJECT_ARRAY_INIT;
122         struct oid_array haves = OID_ARRAY_INIT;
123         struct object_array shallows = OBJECT_ARRAY_INIT;
124         struct string_list deepen_not = STRING_LIST_INIT_DUP;
125         struct string_list uri_protocols = STRING_LIST_INIT_DUP;
126         struct object_array extra_edge_obj = OBJECT_ARRAY_INIT;
127         struct string_list allowed_filters = STRING_LIST_INIT_DUP;
128
129         memset(data, 0, sizeof(*data));
130         data->symref = symref;
131         data->wanted_refs = wanted_refs;
132         data->want_obj = want_obj;
133         data->have_obj = have_obj;
134         data->haves = haves;
135         data->shallows = shallows;
136         data->deepen_not = deepen_not;
137         data->uri_protocols = uri_protocols;
138         data->extra_edge_obj = extra_edge_obj;
139         data->allowed_filters = allowed_filters;
140         data->allow_filter_fallback = 1;
141         data->tree_filter_max_depth = ULONG_MAX;
142         packet_writer_init(&data->writer, 1);
143
144         data->keepalive = 5;
145         data->advertise_sid = 0;
146 }
147
148 static void upload_pack_data_clear(struct upload_pack_data *data)
149 {
150         string_list_clear(&data->symref, 1);
151         string_list_clear(&data->wanted_refs, 1);
152         object_array_clear(&data->want_obj);
153         object_array_clear(&data->have_obj);
154         oid_array_clear(&data->haves);
155         object_array_clear(&data->shallows);
156         string_list_clear(&data->deepen_not, 0);
157         object_array_clear(&data->extra_edge_obj);
158         list_objects_filter_release(&data->filter_options);
159         string_list_clear(&data->allowed_filters, 0);
160
161         free((char *)data->pack_objects_hook);
162 }
163
164 static void reset_timeout(unsigned int timeout)
165 {
166         alarm(timeout);
167 }
168
169 static void send_client_data(int fd, const char *data, ssize_t sz,
170                              int use_sideband)
171 {
172         if (use_sideband) {
173                 send_sideband(1, fd, data, sz, use_sideband);
174                 return;
175         }
176         if (fd == 3)
177                 /* emergency quit */
178                 fd = 2;
179         if (fd == 2) {
180                 /* XXX: are we happy to lose stuff here? */
181                 xwrite(fd, data, sz);
182                 return;
183         }
184         write_or_die(fd, data, sz);
185 }
186
187 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
188 {
189         FILE *fp = cb_data;
190         if (graft->nr_parent == -1)
191                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
192         return 0;
193 }
194
195 struct output_state {
196         char buffer[8193];
197         int used;
198         unsigned packfile_uris_started : 1;
199         unsigned packfile_started : 1;
200 };
201
202 static int relay_pack_data(int pack_objects_out, struct output_state *os,
203                            int use_sideband, int write_packfile_line)
204 {
205         /*
206          * We keep the last byte to ourselves
207          * in case we detect broken rev-list, so that we
208          * can leave the stream corrupted.  This is
209          * unfortunate -- unpack-objects would happily
210          * accept a valid packdata with trailing garbage,
211          * so appending garbage after we pass all the
212          * pack data is not good enough to signal
213          * breakage to downstream.
214          */
215         ssize_t readsz;
216
217         readsz = xread(pack_objects_out, os->buffer + os->used,
218                        sizeof(os->buffer) - os->used);
219         if (readsz < 0) {
220                 return readsz;
221         }
222         os->used += readsz;
223
224         while (!os->packfile_started) {
225                 char *p;
226                 if (os->used >= 4 && !memcmp(os->buffer, "PACK", 4)) {
227                         os->packfile_started = 1;
228                         if (write_packfile_line) {
229                                 if (os->packfile_uris_started)
230                                         packet_delim(1);
231                                 packet_write_fmt(1, "\1packfile\n");
232                         }
233                         break;
234                 }
235                 if ((p = memchr(os->buffer, '\n', os->used))) {
236                         if (!os->packfile_uris_started) {
237                                 os->packfile_uris_started = 1;
238                                 if (!write_packfile_line)
239                                         BUG("packfile_uris requires sideband-all");
240                                 packet_write_fmt(1, "\1packfile-uris\n");
241                         }
242                         *p = '\0';
243                         packet_write_fmt(1, "\1%s\n", os->buffer);
244
245                         os->used -= p - os->buffer + 1;
246                         memmove(os->buffer, p + 1, os->used);
247                 } else {
248                         /*
249                          * Incomplete line.
250                          */
251                         return readsz;
252                 }
253         }
254
255         if (os->used > 1) {
256                 send_client_data(1, os->buffer, os->used - 1, use_sideband);
257                 os->buffer[0] = os->buffer[os->used - 1];
258                 os->used = 1;
259         } else {
260                 send_client_data(1, os->buffer, os->used, use_sideband);
261                 os->used = 0;
262         }
263
264         return readsz;
265 }
266
267 static void create_pack_file(struct upload_pack_data *pack_data,
268                              const struct string_list *uri_protocols)
269 {
270         struct child_process pack_objects = CHILD_PROCESS_INIT;
271         struct output_state output_state = { { 0 } };
272         char progress[128];
273         char abort_msg[] = "aborting due to possible repository "
274                 "corruption on the remote side.";
275         ssize_t sz;
276         int i;
277         FILE *pipe_fd;
278
279         if (!pack_data->pack_objects_hook)
280                 pack_objects.git_cmd = 1;
281         else {
282                 strvec_push(&pack_objects.args, pack_data->pack_objects_hook);
283                 strvec_push(&pack_objects.args, "git");
284                 pack_objects.use_shell = 1;
285         }
286
287         if (pack_data->shallow_nr) {
288                 strvec_push(&pack_objects.args, "--shallow-file");
289                 strvec_push(&pack_objects.args, "");
290         }
291         strvec_push(&pack_objects.args, "pack-objects");
292         strvec_push(&pack_objects.args, "--revs");
293         if (pack_data->use_thin_pack)
294                 strvec_push(&pack_objects.args, "--thin");
295
296         strvec_push(&pack_objects.args, "--stdout");
297         if (pack_data->shallow_nr)
298                 strvec_push(&pack_objects.args, "--shallow");
299         if (!pack_data->no_progress)
300                 strvec_push(&pack_objects.args, "--progress");
301         if (pack_data->use_ofs_delta)
302                 strvec_push(&pack_objects.args, "--delta-base-offset");
303         if (pack_data->use_include_tag)
304                 strvec_push(&pack_objects.args, "--include-tag");
305         if (pack_data->filter_options.choice) {
306                 const char *spec =
307                         expand_list_objects_filter_spec(&pack_data->filter_options);
308                 if (pack_objects.use_shell) {
309                         struct strbuf buf = STRBUF_INIT;
310                         sq_quote_buf(&buf, spec);
311                         strvec_pushf(&pack_objects.args, "--filter=%s", buf.buf);
312                         strbuf_release(&buf);
313                 } else {
314                         strvec_pushf(&pack_objects.args, "--filter=%s", spec);
315                 }
316         }
317         if (uri_protocols) {
318                 for (i = 0; i < uri_protocols->nr; i++)
319                         strvec_pushf(&pack_objects.args, "--uri-protocol=%s",
320                                          uri_protocols->items[i].string);
321         }
322
323         pack_objects.in = -1;
324         pack_objects.out = -1;
325         pack_objects.err = -1;
326         pack_objects.clean_on_exit = 1;
327
328         if (start_command(&pack_objects))
329                 die("git upload-pack: unable to fork git-pack-objects");
330
331         pipe_fd = xfdopen(pack_objects.in, "w");
332
333         if (pack_data->shallow_nr)
334                 for_each_commit_graft(write_one_shallow, pipe_fd);
335
336         for (i = 0; i < pack_data->want_obj.nr; i++)
337                 fprintf(pipe_fd, "%s\n",
338                         oid_to_hex(&pack_data->want_obj.objects[i].item->oid));
339         fprintf(pipe_fd, "--not\n");
340         for (i = 0; i < pack_data->have_obj.nr; i++)
341                 fprintf(pipe_fd, "%s\n",
342                         oid_to_hex(&pack_data->have_obj.objects[i].item->oid));
343         for (i = 0; i < pack_data->extra_edge_obj.nr; i++)
344                 fprintf(pipe_fd, "%s\n",
345                         oid_to_hex(&pack_data->extra_edge_obj.objects[i].item->oid));
346         fprintf(pipe_fd, "\n");
347         fflush(pipe_fd);
348         fclose(pipe_fd);
349
350         /* We read from pack_objects.err to capture stderr output for
351          * progress bar, and pack_objects.out to capture the pack data.
352          */
353
354         while (1) {
355                 struct pollfd pfd[2];
356                 int pe, pu, pollsize, polltimeout;
357                 int ret;
358
359                 reset_timeout(pack_data->timeout);
360
361                 pollsize = 0;
362                 pe = pu = -1;
363
364                 if (0 <= pack_objects.out) {
365                         pfd[pollsize].fd = pack_objects.out;
366                         pfd[pollsize].events = POLLIN;
367                         pu = pollsize;
368                         pollsize++;
369                 }
370                 if (0 <= pack_objects.err) {
371                         pfd[pollsize].fd = pack_objects.err;
372                         pfd[pollsize].events = POLLIN;
373                         pe = pollsize;
374                         pollsize++;
375                 }
376
377                 if (!pollsize)
378                         break;
379
380                 polltimeout = pack_data->keepalive < 0
381                         ? -1
382                         : 1000 * pack_data->keepalive;
383
384                 ret = poll(pfd, pollsize, polltimeout);
385
386                 if (ret < 0) {
387                         if (errno != EINTR) {
388                                 error_errno("poll failed, resuming");
389                                 sleep(1);
390                         }
391                         continue;
392                 }
393                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
394                         /* Status ready; we ship that in the side-band
395                          * or dump to the standard error.
396                          */
397                         sz = xread(pack_objects.err, progress,
398                                   sizeof(progress));
399                         if (0 < sz)
400                                 send_client_data(2, progress, sz,
401                                                  pack_data->use_sideband);
402                         else if (sz == 0) {
403                                 close(pack_objects.err);
404                                 pack_objects.err = -1;
405                         }
406                         else
407                                 goto fail;
408                         /* give priority to status messages */
409                         continue;
410                 }
411                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
412                         int result = relay_pack_data(pack_objects.out,
413                                                      &output_state,
414                                                      pack_data->use_sideband,
415                                                      !!uri_protocols);
416
417                         if (result == 0) {
418                                 close(pack_objects.out);
419                                 pack_objects.out = -1;
420                         } else if (result < 0) {
421                                 goto fail;
422                         }
423                 }
424
425                 /*
426                  * We hit the keepalive timeout without saying anything; send
427                  * an empty message on the data sideband just to let the other
428                  * side know we're still working on it, but don't have any data
429                  * yet.
430                  *
431                  * If we don't have a sideband channel, there's no room in the
432                  * protocol to say anything, so those clients are just out of
433                  * luck.
434                  */
435                 if (!ret && pack_data->use_sideband) {
436                         static const char buf[] = "0005\1";
437                         write_or_die(1, buf, 5);
438                 }
439         }
440
441         if (finish_command(&pack_objects)) {
442                 error("git upload-pack: git-pack-objects died with error.");
443                 goto fail;
444         }
445
446         /* flush the data */
447         if (output_state.used > 0) {
448                 send_client_data(1, output_state.buffer, output_state.used,
449                                  pack_data->use_sideband);
450                 fprintf(stderr, "flushed.\n");
451         }
452         if (pack_data->use_sideband)
453                 packet_flush(1);
454         return;
455
456  fail:
457         send_client_data(3, abort_msg, sizeof(abort_msg),
458                          pack_data->use_sideband);
459         die("git upload-pack: %s", abort_msg);
460 }
461
462 static int do_got_oid(struct upload_pack_data *data, const struct object_id *oid)
463 {
464         int we_knew_they_have = 0;
465         struct object *o = parse_object(the_repository, oid);
466
467         if (!o)
468                 die("oops (%s)", oid_to_hex(oid));
469         if (o->type == OBJ_COMMIT) {
470                 struct commit_list *parents;
471                 struct commit *commit = (struct commit *)o;
472                 if (o->flags & THEY_HAVE)
473                         we_knew_they_have = 1;
474                 else
475                         o->flags |= THEY_HAVE;
476                 if (!data->oldest_have || (commit->date < data->oldest_have))
477                         data->oldest_have = commit->date;
478                 for (parents = commit->parents;
479                      parents;
480                      parents = parents->next)
481                         parents->item->object.flags |= THEY_HAVE;
482         }
483         if (!we_knew_they_have) {
484                 add_object_array(o, NULL, &data->have_obj);
485                 return 1;
486         }
487         return 0;
488 }
489
490 static int got_oid(struct upload_pack_data *data,
491                    const char *hex, struct object_id *oid)
492 {
493         if (get_oid_hex(hex, oid))
494                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
495         if (!has_object_file_with_flags(oid,
496                                         OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
497                 return -1;
498         return do_got_oid(data, oid);
499 }
500
501 static int ok_to_give_up(struct upload_pack_data *data)
502 {
503         uint32_t min_generation = GENERATION_NUMBER_ZERO;
504
505         if (!data->have_obj.nr)
506                 return 0;
507
508         return can_all_from_reach_with_flag(&data->want_obj, THEY_HAVE,
509                                             COMMON_KNOWN, data->oldest_have,
510                                             min_generation);
511 }
512
513 static int get_common_commits(struct upload_pack_data *data,
514                               struct packet_reader *reader)
515 {
516         struct object_id oid;
517         char last_hex[GIT_MAX_HEXSZ + 1];
518         int got_common = 0;
519         int got_other = 0;
520         int sent_ready = 0;
521
522         save_commit_buffer = 0;
523
524         for (;;) {
525                 const char *arg;
526
527                 reset_timeout(data->timeout);
528
529                 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
530                         if (data->multi_ack == MULTI_ACK_DETAILED
531                             && got_common
532                             && !got_other
533                             && ok_to_give_up(data)) {
534                                 sent_ready = 1;
535                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
536                         }
537                         if (data->have_obj.nr == 0 || data->multi_ack)
538                                 packet_write_fmt(1, "NAK\n");
539
540                         if (data->no_done && sent_ready) {
541                                 packet_write_fmt(1, "ACK %s\n", last_hex);
542                                 return 0;
543                         }
544                         if (data->stateless_rpc)
545                                 exit(0);
546                         got_common = 0;
547                         got_other = 0;
548                         continue;
549                 }
550                 if (skip_prefix(reader->line, "have ", &arg)) {
551                         switch (got_oid(data, arg, &oid)) {
552                         case -1: /* they have what we do not */
553                                 got_other = 1;
554                                 if (data->multi_ack
555                                     && ok_to_give_up(data)) {
556                                         const char *hex = oid_to_hex(&oid);
557                                         if (data->multi_ack == MULTI_ACK_DETAILED) {
558                                                 sent_ready = 1;
559                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
560                                         } else
561                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
562                                 }
563                                 break;
564                         default:
565                                 got_common = 1;
566                                 oid_to_hex_r(last_hex, &oid);
567                                 if (data->multi_ack == MULTI_ACK_DETAILED)
568                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
569                                 else if (data->multi_ack)
570                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
571                                 else if (data->have_obj.nr == 1)
572                                         packet_write_fmt(1, "ACK %s\n", last_hex);
573                                 break;
574                         }
575                         continue;
576                 }
577                 if (!strcmp(reader->line, "done")) {
578                         if (data->have_obj.nr > 0) {
579                                 if (data->multi_ack)
580                                         packet_write_fmt(1, "ACK %s\n", last_hex);
581                                 return 0;
582                         }
583                         packet_write_fmt(1, "NAK\n");
584                         return -1;
585                 }
586                 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
587         }
588 }
589
590 static int is_our_ref(struct object *o, enum allow_uor allow_uor)
591 {
592         int allow_hidden_ref = (allow_uor &
593                                 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
594         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
595 }
596
597 /*
598  * on successful case, it's up to the caller to close cmd->out
599  */
600 static int do_reachable_revlist(struct child_process *cmd,
601                                 struct object_array *src,
602                                 struct object_array *reachable,
603                                 enum allow_uor allow_uor)
604 {
605         static const char *argv[] = {
606                 "rev-list", "--stdin", NULL,
607         };
608         struct object *o;
609         FILE *cmd_in = NULL;
610         int i;
611
612         cmd->argv = argv;
613         cmd->git_cmd = 1;
614         cmd->no_stderr = 1;
615         cmd->in = -1;
616         cmd->out = -1;
617
618         /*
619          * If the next rev-list --stdin encounters an unknown commit,
620          * it terminates, which will cause SIGPIPE in the write loop
621          * below.
622          */
623         sigchain_push(SIGPIPE, SIG_IGN);
624
625         if (start_command(cmd))
626                 goto error;
627
628         cmd_in = xfdopen(cmd->in, "w");
629
630         for (i = get_max_object_index(); 0 < i; ) {
631                 o = get_indexed_object(--i);
632                 if (!o)
633                         continue;
634                 if (reachable && o->type == OBJ_COMMIT)
635                         o->flags &= ~TMP_MARK;
636                 if (!is_our_ref(o, allow_uor))
637                         continue;
638                 if (fprintf(cmd_in, "^%s\n", oid_to_hex(&o->oid)) < 0)
639                         goto error;
640         }
641         for (i = 0; i < src->nr; i++) {
642                 o = src->objects[i].item;
643                 if (is_our_ref(o, allow_uor)) {
644                         if (reachable)
645                                 add_object_array(o, NULL, reachable);
646                         continue;
647                 }
648                 if (reachable && o->type == OBJ_COMMIT)
649                         o->flags |= TMP_MARK;
650                 if (fprintf(cmd_in, "%s\n", oid_to_hex(&o->oid)) < 0)
651                         goto error;
652         }
653         if (ferror(cmd_in) || fflush(cmd_in))
654                 goto error;
655         fclose(cmd_in);
656         cmd->in = -1;
657         sigchain_pop(SIGPIPE);
658
659         return 0;
660
661 error:
662         sigchain_pop(SIGPIPE);
663
664         if (cmd_in)
665                 fclose(cmd_in);
666         if (cmd->out >= 0)
667                 close(cmd->out);
668         return -1;
669 }
670
671 static int get_reachable_list(struct upload_pack_data *data,
672                               struct object_array *reachable)
673 {
674         struct child_process cmd = CHILD_PROCESS_INIT;
675         int i;
676         struct object *o;
677         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
678         const unsigned hexsz = the_hash_algo->hexsz;
679
680         if (do_reachable_revlist(&cmd, &data->shallows, reachable,
681                                  data->allow_uor) < 0)
682                 return -1;
683
684         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
685                 struct object_id oid;
686                 const char *p;
687
688                 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
689                         break;
690
691                 o = lookup_object(the_repository, &oid);
692                 if (o && o->type == OBJ_COMMIT) {
693                         o->flags &= ~TMP_MARK;
694                 }
695         }
696         for (i = get_max_object_index(); 0 < i; i--) {
697                 o = get_indexed_object(i - 1);
698                 if (o && o->type == OBJ_COMMIT &&
699                     (o->flags & TMP_MARK)) {
700                         add_object_array(o, NULL, reachable);
701                                 o->flags &= ~TMP_MARK;
702                 }
703         }
704         close(cmd.out);
705
706         if (finish_command(&cmd))
707                 return -1;
708
709         return 0;
710 }
711
712 static int has_unreachable(struct object_array *src, enum allow_uor allow_uor)
713 {
714         struct child_process cmd = CHILD_PROCESS_INIT;
715         char buf[1];
716         int i;
717
718         if (do_reachable_revlist(&cmd, src, NULL, allow_uor) < 0)
719                 return 1;
720
721         /*
722          * The commits out of the rev-list are not ancestors of
723          * our ref.
724          */
725         i = read_in_full(cmd.out, buf, 1);
726         if (i)
727                 goto error;
728         close(cmd.out);
729         cmd.out = -1;
730
731         /*
732          * rev-list may have died by encountering a bad commit
733          * in the history, in which case we do want to bail out
734          * even when it showed no commit.
735          */
736         if (finish_command(&cmd))
737                 goto error;
738
739         /* All the non-tip ones are ancestors of what we advertised */
740         return 0;
741
742 error:
743         if (cmd.out >= 0)
744                 close(cmd.out);
745         return 1;
746 }
747
748 static void check_non_tip(struct upload_pack_data *data)
749 {
750         int i;
751
752         /*
753          * In the normal in-process case without
754          * uploadpack.allowReachableSHA1InWant,
755          * non-tip requests can never happen.
756          */
757         if (!data->stateless_rpc && !(data->allow_uor & ALLOW_REACHABLE_SHA1))
758                 goto error;
759         if (!has_unreachable(&data->want_obj, data->allow_uor))
760                 /* All the non-tip ones are ancestors of what we advertised */
761                 return;
762
763 error:
764         /* Pick one of them (we know there at least is one) */
765         for (i = 0; i < data->want_obj.nr; i++) {
766                 struct object *o = data->want_obj.objects[i].item;
767                 if (!is_our_ref(o, data->allow_uor)) {
768                         packet_writer_error(&data->writer,
769                                             "upload-pack: not our ref %s",
770                                             oid_to_hex(&o->oid));
771                         die("git upload-pack: not our ref %s",
772                             oid_to_hex(&o->oid));
773                 }
774         }
775 }
776
777 static void send_shallow(struct upload_pack_data *data,
778                          struct commit_list *result)
779 {
780         while (result) {
781                 struct object *object = &result->item->object;
782                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
783                         packet_writer_write(&data->writer, "shallow %s",
784                                             oid_to_hex(&object->oid));
785                         register_shallow(the_repository, &object->oid);
786                         data->shallow_nr++;
787                 }
788                 result = result->next;
789         }
790 }
791
792 static void send_unshallow(struct upload_pack_data *data)
793 {
794         int i;
795
796         for (i = 0; i < data->shallows.nr; i++) {
797                 struct object *object = data->shallows.objects[i].item;
798                 if (object->flags & NOT_SHALLOW) {
799                         struct commit_list *parents;
800                         packet_writer_write(&data->writer, "unshallow %s",
801                                             oid_to_hex(&object->oid));
802                         object->flags &= ~CLIENT_SHALLOW;
803                         /*
804                          * We want to _register_ "object" as shallow, but we
805                          * also need to traverse object's parents to deepen a
806                          * shallow clone. Unregister it for now so we can
807                          * parse and add the parents to the want list, then
808                          * re-register it.
809                          */
810                         unregister_shallow(&object->oid);
811                         object->parsed = 0;
812                         parse_commit_or_die((struct commit *)object);
813                         parents = ((struct commit *)object)->parents;
814                         while (parents) {
815                                 add_object_array(&parents->item->object,
816                                                  NULL, &data->want_obj);
817                                 parents = parents->next;
818                         }
819                         add_object_array(object, NULL, &data->extra_edge_obj);
820                 }
821                 /* make sure commit traversal conforms to client */
822                 register_shallow(the_repository, &object->oid);
823         }
824 }
825
826 static int check_ref(const char *refname_full, const struct object_id *oid,
827                      int flag, void *cb_data);
828 static void deepen(struct upload_pack_data *data, int depth)
829 {
830         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
831                 int i;
832
833                 for (i = 0; i < data->shallows.nr; i++) {
834                         struct object *object = data->shallows.objects[i].item;
835                         object->flags |= NOT_SHALLOW;
836                 }
837         } else if (data->deepen_relative) {
838                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
839                 struct commit_list *result;
840
841                 /*
842                  * Checking for reachable shallows requires that our refs be
843                  * marked with OUR_REF.
844                  */
845                 head_ref_namespaced(check_ref, NULL);
846                 for_each_namespaced_ref(check_ref, NULL);
847
848                 get_reachable_list(data, &reachable_shallows);
849                 result = get_shallow_commits(&reachable_shallows,
850                                              depth + 1,
851                                              SHALLOW, NOT_SHALLOW);
852                 send_shallow(data, result);
853                 free_commit_list(result);
854                 object_array_clear(&reachable_shallows);
855         } else {
856                 struct commit_list *result;
857
858                 result = get_shallow_commits(&data->want_obj, depth,
859                                              SHALLOW, NOT_SHALLOW);
860                 send_shallow(data, result);
861                 free_commit_list(result);
862         }
863
864         send_unshallow(data);
865 }
866
867 static void deepen_by_rev_list(struct upload_pack_data *data,
868                                int ac,
869                                const char **av)
870 {
871         struct commit_list *result;
872
873         disable_commit_graph(the_repository);
874         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
875         send_shallow(data, result);
876         free_commit_list(result);
877         send_unshallow(data);
878 }
879
880 /* Returns 1 if a shallow list is sent or 0 otherwise */
881 static int send_shallow_list(struct upload_pack_data *data)
882 {
883         int ret = 0;
884
885         if (data->depth > 0 && data->deepen_rev_list)
886                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
887         if (data->depth > 0) {
888                 deepen(data, data->depth);
889                 ret = 1;
890         } else if (data->deepen_rev_list) {
891                 struct strvec av = STRVEC_INIT;
892                 int i;
893
894                 strvec_push(&av, "rev-list");
895                 if (data->deepen_since)
896                         strvec_pushf(&av, "--max-age=%"PRItime, data->deepen_since);
897                 if (data->deepen_not.nr) {
898                         strvec_push(&av, "--not");
899                         for (i = 0; i < data->deepen_not.nr; i++) {
900                                 struct string_list_item *s = data->deepen_not.items + i;
901                                 strvec_push(&av, s->string);
902                         }
903                         strvec_push(&av, "--not");
904                 }
905                 for (i = 0; i < data->want_obj.nr; i++) {
906                         struct object *o = data->want_obj.objects[i].item;
907                         strvec_push(&av, oid_to_hex(&o->oid));
908                 }
909                 deepen_by_rev_list(data, av.nr, av.v);
910                 strvec_clear(&av);
911                 ret = 1;
912         } else {
913                 if (data->shallows.nr > 0) {
914                         int i;
915                         for (i = 0; i < data->shallows.nr; i++)
916                                 register_shallow(the_repository,
917                                                  &data->shallows.objects[i].item->oid);
918                 }
919         }
920
921         data->shallow_nr += data->shallows.nr;
922         return ret;
923 }
924
925 static int process_shallow(const char *line, struct object_array *shallows)
926 {
927         const char *arg;
928         if (skip_prefix(line, "shallow ", &arg)) {
929                 struct object_id oid;
930                 struct object *object;
931                 if (get_oid_hex(arg, &oid))
932                         die("invalid shallow line: %s", line);
933                 object = parse_object(the_repository, &oid);
934                 if (!object)
935                         return 1;
936                 if (object->type != OBJ_COMMIT)
937                         die("invalid shallow object %s", oid_to_hex(&oid));
938                 if (!(object->flags & CLIENT_SHALLOW)) {
939                         object->flags |= CLIENT_SHALLOW;
940                         add_object_array(object, NULL, shallows);
941                 }
942                 return 1;
943         }
944
945         return 0;
946 }
947
948 static int process_deepen(const char *line, int *depth)
949 {
950         const char *arg;
951         if (skip_prefix(line, "deepen ", &arg)) {
952                 char *end = NULL;
953                 *depth = (int)strtol(arg, &end, 0);
954                 if (!end || *end || *depth <= 0)
955                         die("Invalid deepen: %s", line);
956                 return 1;
957         }
958
959         return 0;
960 }
961
962 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
963 {
964         const char *arg;
965         if (skip_prefix(line, "deepen-since ", &arg)) {
966                 char *end = NULL;
967                 *deepen_since = parse_timestamp(arg, &end, 0);
968                 if (!end || *end || !deepen_since ||
969                     /* revisions.c's max_age -1 is special */
970                     *deepen_since == -1)
971                         die("Invalid deepen-since: %s", line);
972                 *deepen_rev_list = 1;
973                 return 1;
974         }
975         return 0;
976 }
977
978 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
979 {
980         const char *arg;
981         if (skip_prefix(line, "deepen-not ", &arg)) {
982                 char *ref = NULL;
983                 struct object_id oid;
984                 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
985                         die("git upload-pack: ambiguous deepen-not: %s", line);
986                 string_list_append(deepen_not, ref);
987                 free(ref);
988                 *deepen_rev_list = 1;
989                 return 1;
990         }
991         return 0;
992 }
993
994 NORETURN __attribute__((format(printf,2,3)))
995 static void send_err_and_die(struct upload_pack_data *data,
996                              const char *fmt, ...)
997 {
998         struct strbuf buf = STRBUF_INIT;
999         va_list ap;
1000
1001         va_start(ap, fmt);
1002         strbuf_vaddf(&buf, fmt, ap);
1003         va_end(ap);
1004
1005         packet_writer_error(&data->writer, "%s", buf.buf);
1006         die("%s", buf.buf);
1007 }
1008
1009 static void check_one_filter(struct upload_pack_data *data,
1010                              struct list_objects_filter_options *opts)
1011 {
1012         const char *key = list_object_filter_config_name(opts->choice);
1013         struct string_list_item *item = string_list_lookup(&data->allowed_filters,
1014                                                            key);
1015         int allowed;
1016
1017         if (item)
1018                 allowed = (intptr_t)item->util;
1019         else
1020                 allowed = data->allow_filter_fallback;
1021
1022         if (!allowed)
1023                 send_err_and_die(data, "filter '%s' not supported", key);
1024
1025         if (opts->choice == LOFC_TREE_DEPTH &&
1026             opts->tree_exclude_depth > data->tree_filter_max_depth)
1027                 send_err_and_die(data,
1028                                  "tree filter allows max depth %lu, but got %lu",
1029                                  data->tree_filter_max_depth,
1030                                  opts->tree_exclude_depth);
1031 }
1032
1033 static void check_filter_recurse(struct upload_pack_data *data,
1034                                  struct list_objects_filter_options *opts)
1035 {
1036         size_t i;
1037
1038         check_one_filter(data, opts);
1039         if (opts->choice != LOFC_COMBINE)
1040                 return;
1041
1042         for (i = 0; i < opts->sub_nr; i++)
1043                 check_filter_recurse(data, &opts->sub[i]);
1044 }
1045
1046 static void die_if_using_banned_filter(struct upload_pack_data *data)
1047 {
1048         check_filter_recurse(data, &data->filter_options);
1049 }
1050
1051 static void receive_needs(struct upload_pack_data *data,
1052                           struct packet_reader *reader)
1053 {
1054         int has_non_tip = 0;
1055
1056         data->shallow_nr = 0;
1057         for (;;) {
1058                 struct object *o;
1059                 const char *features;
1060                 struct object_id oid_buf;
1061                 const char *arg;
1062                 int feature_len;
1063
1064                 reset_timeout(data->timeout);
1065                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
1066                         break;
1067
1068                 if (process_shallow(reader->line, &data->shallows))
1069                         continue;
1070                 if (process_deepen(reader->line, &data->depth))
1071                         continue;
1072                 if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
1073                         continue;
1074                 if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
1075                         continue;
1076
1077                 if (skip_prefix(reader->line, "filter ", &arg)) {
1078                         if (!data->filter_capability_requested)
1079                                 die("git upload-pack: filtering capability not negotiated");
1080                         list_objects_filter_die_if_populated(&data->filter_options);
1081                         parse_list_objects_filter(&data->filter_options, arg);
1082                         die_if_using_banned_filter(data);
1083                         continue;
1084                 }
1085
1086                 if (!skip_prefix(reader->line, "want ", &arg) ||
1087                     parse_oid_hex(arg, &oid_buf, &features))
1088                         die("git upload-pack: protocol error, "
1089                             "expected to get object ID, not '%s'", reader->line);
1090
1091                 if (parse_feature_request(features, "deepen-relative"))
1092                         data->deepen_relative = 1;
1093                 if (parse_feature_request(features, "multi_ack_detailed"))
1094                         data->multi_ack = MULTI_ACK_DETAILED;
1095                 else if (parse_feature_request(features, "multi_ack"))
1096                         data->multi_ack = MULTI_ACK;
1097                 if (parse_feature_request(features, "no-done"))
1098                         data->no_done = 1;
1099                 if (parse_feature_request(features, "thin-pack"))
1100                         data->use_thin_pack = 1;
1101                 if (parse_feature_request(features, "ofs-delta"))
1102                         data->use_ofs_delta = 1;
1103                 if (parse_feature_request(features, "side-band-64k"))
1104                         data->use_sideband = LARGE_PACKET_MAX;
1105                 else if (parse_feature_request(features, "side-band"))
1106                         data->use_sideband = DEFAULT_PACKET_MAX;
1107                 if (parse_feature_request(features, "no-progress"))
1108                         data->no_progress = 1;
1109                 if (parse_feature_request(features, "include-tag"))
1110                         data->use_include_tag = 1;
1111                 if (data->allow_filter &&
1112                     parse_feature_request(features, "filter"))
1113                         data->filter_capability_requested = 1;
1114
1115                 arg = parse_feature_value(features, "session-id", &feature_len, NULL);
1116                 if (arg) {
1117                         char *client_sid = xstrndup(arg, feature_len);
1118                         trace2_data_string("transfer", NULL, "client-sid", client_sid);
1119                         free(client_sid);
1120                 }
1121
1122                 o = parse_object(the_repository, &oid_buf);
1123                 if (!o) {
1124                         packet_writer_error(&data->writer,
1125                                             "upload-pack: not our ref %s",
1126                                             oid_to_hex(&oid_buf));
1127                         die("git upload-pack: not our ref %s",
1128                             oid_to_hex(&oid_buf));
1129                 }
1130                 if (!(o->flags & WANTED)) {
1131                         o->flags |= WANTED;
1132                         if (!((data->allow_uor & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
1133                               || is_our_ref(o, data->allow_uor)))
1134                                 has_non_tip = 1;
1135                         add_object_array(o, NULL, &data->want_obj);
1136                 }
1137         }
1138
1139         /*
1140          * We have sent all our refs already, and the other end
1141          * should have chosen out of them. When we are operating
1142          * in the stateless RPC mode, however, their choice may
1143          * have been based on the set of older refs advertised
1144          * by another process that handled the initial request.
1145          */
1146         if (has_non_tip)
1147                 check_non_tip(data);
1148
1149         if (!data->use_sideband && data->daemon_mode)
1150                 data->no_progress = 1;
1151
1152         if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1153                 return;
1154
1155         if (send_shallow_list(data))
1156                 packet_flush(1);
1157 }
1158
1159 /* return non-zero if the ref is hidden, otherwise 0 */
1160 static int mark_our_ref(const char *refname, const char *refname_full,
1161                         const struct object_id *oid)
1162 {
1163         struct object *o = lookup_unknown_object(oid);
1164
1165         if (ref_is_hidden(refname, refname_full)) {
1166                 o->flags |= HIDDEN_REF;
1167                 return 1;
1168         }
1169         o->flags |= OUR_REF;
1170         return 0;
1171 }
1172
1173 static int check_ref(const char *refname_full, const struct object_id *oid,
1174                      int flag, void *cb_data)
1175 {
1176         const char *refname = strip_namespace(refname_full);
1177
1178         mark_our_ref(refname, refname_full, oid);
1179         return 0;
1180 }
1181
1182 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1183 {
1184         struct string_list_item *item;
1185
1186         if (!symref->nr)
1187                 return;
1188         for_each_string_list_item(item, symref)
1189                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1190 }
1191
1192 static void format_session_id(struct strbuf *buf, struct upload_pack_data *d) {
1193         if (d->advertise_sid)
1194                 strbuf_addf(buf, " session-id=%s", trace2_session_id());
1195 }
1196
1197 static int send_ref(const char *refname, const struct object_id *oid,
1198                     int flag, void *cb_data)
1199 {
1200         static const char *capabilities = "multi_ack thin-pack side-band"
1201                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1202                 " deepen-relative no-progress include-tag multi_ack_detailed";
1203         const char *refname_nons = strip_namespace(refname);
1204         struct object_id peeled;
1205         struct upload_pack_data *data = cb_data;
1206
1207         if (mark_our_ref(refname_nons, refname, oid))
1208                 return 0;
1209
1210         if (capabilities) {
1211                 struct strbuf symref_info = STRBUF_INIT;
1212                 struct strbuf session_id = STRBUF_INIT;
1213
1214                 format_symref_info(&symref_info, &data->symref);
1215                 format_session_id(&session_id, data);
1216                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s%s object-format=%s agent=%s\n",
1217                              oid_to_hex(oid), refname_nons,
1218                              0, capabilities,
1219                              (data->allow_uor & ALLOW_TIP_SHA1) ?
1220                                      " allow-tip-sha1-in-want" : "",
1221                              (data->allow_uor & ALLOW_REACHABLE_SHA1) ?
1222                                      " allow-reachable-sha1-in-want" : "",
1223                              data->stateless_rpc ? " no-done" : "",
1224                              symref_info.buf,
1225                              data->allow_filter ? " filter" : "",
1226                              session_id.buf,
1227                              the_hash_algo->name,
1228                              git_user_agent_sanitized());
1229                 strbuf_release(&symref_info);
1230                 strbuf_release(&session_id);
1231         } else {
1232                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1233         }
1234         capabilities = NULL;
1235         if (!peel_ref(refname, &peeled))
1236                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1237         return 0;
1238 }
1239
1240 static int find_symref(const char *refname, const struct object_id *oid,
1241                        int flag, void *cb_data)
1242 {
1243         const char *symref_target;
1244         struct string_list_item *item;
1245
1246         if ((flag & REF_ISSYMREF) == 0)
1247                 return 0;
1248         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1249         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1250                 die("'%s' is a symref but it is not?", refname);
1251         item = string_list_append(cb_data, strip_namespace(refname));
1252         item->util = xstrdup(strip_namespace(symref_target));
1253         return 0;
1254 }
1255
1256 static int parse_object_filter_config(const char *var, const char *value,
1257                                        struct upload_pack_data *data)
1258 {
1259         struct strbuf buf = STRBUF_INIT;
1260         const char *sub, *key;
1261         size_t sub_len;
1262
1263         if (parse_config_key(var, "uploadpackfilter", &sub, &sub_len, &key))
1264                 return 0;
1265
1266         if (!sub) {
1267                 if (!strcmp(key, "allow"))
1268                         data->allow_filter_fallback = git_config_bool(var, value);
1269                 return 0;
1270         }
1271
1272         strbuf_add(&buf, sub, sub_len);
1273
1274         if (!strcmp(key, "allow"))
1275                 string_list_insert(&data->allowed_filters, buf.buf)->util =
1276                         (void *)(intptr_t)git_config_bool(var, value);
1277         else if (!strcmp(buf.buf, "tree") && !strcmp(key, "maxdepth")) {
1278                 if (!value) {
1279                         strbuf_release(&buf);
1280                         return config_error_nonbool(var);
1281                 }
1282                 string_list_insert(&data->allowed_filters, buf.buf)->util =
1283                         (void *)(intptr_t)1;
1284                 data->tree_filter_max_depth = git_config_ulong(var, value);
1285         }
1286
1287         strbuf_release(&buf);
1288         return 0;
1289 }
1290
1291 static int upload_pack_config(const char *var, const char *value, void *cb_data)
1292 {
1293         struct upload_pack_data *data = cb_data;
1294
1295         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1296                 if (git_config_bool(var, value))
1297                         data->allow_uor |= ALLOW_TIP_SHA1;
1298                 else
1299                         data->allow_uor &= ~ALLOW_TIP_SHA1;
1300         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1301                 if (git_config_bool(var, value))
1302                         data->allow_uor |= ALLOW_REACHABLE_SHA1;
1303                 else
1304                         data->allow_uor &= ~ALLOW_REACHABLE_SHA1;
1305         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1306                 if (git_config_bool(var, value))
1307                         data->allow_uor |= ALLOW_ANY_SHA1;
1308                 else
1309                         data->allow_uor &= ~ALLOW_ANY_SHA1;
1310         } else if (!strcmp("uploadpack.keepalive", var)) {
1311                 data->keepalive = git_config_int(var, value);
1312                 if (!data->keepalive)
1313                         data->keepalive = -1;
1314         } else if (!strcmp("uploadpack.allowfilter", var)) {
1315                 data->allow_filter = git_config_bool(var, value);
1316         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1317                 data->allow_ref_in_want = git_config_bool(var, value);
1318         } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1319                 data->allow_sideband_all = git_config_bool(var, value);
1320         } else if (!strcmp("core.precomposeunicode", var)) {
1321                 precomposed_unicode = git_config_bool(var, value);
1322         } else if (!strcmp("transfer.advertisesid", var)) {
1323                 data->advertise_sid = git_config_bool(var, value);
1324         }
1325
1326         if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
1327             current_config_scope() != CONFIG_SCOPE_WORKTREE) {
1328                 if (!strcmp("uploadpack.packobjectshook", var))
1329                         return git_config_string(&data->pack_objects_hook, var, value);
1330         }
1331
1332         if (parse_object_filter_config(var, value, data) < 0)
1333                 return -1;
1334
1335         return parse_hide_refs_config(var, value, "uploadpack");
1336 }
1337
1338 void upload_pack(struct upload_pack_options *options)
1339 {
1340         struct packet_reader reader;
1341         struct upload_pack_data data;
1342
1343         upload_pack_data_init(&data);
1344
1345         git_config(upload_pack_config, &data);
1346
1347         data.stateless_rpc = options->stateless_rpc;
1348         data.daemon_mode = options->daemon_mode;
1349         data.timeout = options->timeout;
1350
1351         head_ref_namespaced(find_symref, &data.symref);
1352
1353         if (options->advertise_refs || !data.stateless_rpc) {
1354                 reset_timeout(data.timeout);
1355                 head_ref_namespaced(send_ref, &data);
1356                 for_each_namespaced_ref(send_ref, &data);
1357                 advertise_shallow_grafts(1);
1358                 packet_flush(1);
1359         } else {
1360                 head_ref_namespaced(check_ref, NULL);
1361                 for_each_namespaced_ref(check_ref, NULL);
1362         }
1363
1364         if (!options->advertise_refs) {
1365                 packet_reader_init(&reader, 0, NULL, 0,
1366                                    PACKET_READ_CHOMP_NEWLINE |
1367                                    PACKET_READ_DIE_ON_ERR_PACKET);
1368
1369                 receive_needs(&data, &reader);
1370
1371                 /*
1372                  * An EOF at this exact point in negotiation should be
1373                  * acceptable from stateless clients as they will consume the
1374                  * shallow list before doing subsequent rpc with haves/etc.
1375                  */
1376                 if (data.stateless_rpc)
1377                         reader.options |= PACKET_READ_GENTLE_ON_EOF;
1378
1379                 if (data.want_obj.nr &&
1380                     packet_reader_peek(&reader) != PACKET_READ_EOF) {
1381                         reader.options &= ~PACKET_READ_GENTLE_ON_EOF;
1382                         get_common_commits(&data, &reader);
1383                         create_pack_file(&data, NULL);
1384                 }
1385         }
1386
1387         upload_pack_data_clear(&data);
1388 }
1389
1390 static int parse_want(struct packet_writer *writer, const char *line,
1391                       struct object_array *want_obj)
1392 {
1393         const char *arg;
1394         if (skip_prefix(line, "want ", &arg)) {
1395                 struct object_id oid;
1396                 struct object *o;
1397
1398                 if (get_oid_hex(arg, &oid))
1399                         die("git upload-pack: protocol error, "
1400                             "expected to get oid, not '%s'", line);
1401
1402                 o = parse_object(the_repository, &oid);
1403                 if (!o) {
1404                         packet_writer_error(writer,
1405                                             "upload-pack: not our ref %s",
1406                                             oid_to_hex(&oid));
1407                         die("git upload-pack: not our ref %s",
1408                             oid_to_hex(&oid));
1409                 }
1410
1411                 if (!(o->flags & WANTED)) {
1412                         o->flags |= WANTED;
1413                         add_object_array(o, NULL, want_obj);
1414                 }
1415
1416                 return 1;
1417         }
1418
1419         return 0;
1420 }
1421
1422 static int parse_want_ref(struct packet_writer *writer, const char *line,
1423                           struct string_list *wanted_refs,
1424                           struct object_array *want_obj)
1425 {
1426         const char *arg;
1427         if (skip_prefix(line, "want-ref ", &arg)) {
1428                 struct object_id oid;
1429                 struct string_list_item *item;
1430                 struct object *o;
1431
1432                 if (read_ref(arg, &oid)) {
1433                         packet_writer_error(writer, "unknown ref %s", arg);
1434                         die("unknown ref %s", arg);
1435                 }
1436
1437                 item = string_list_append(wanted_refs, arg);
1438                 item->util = oiddup(&oid);
1439
1440                 o = parse_object_or_die(&oid, arg);
1441                 if (!(o->flags & WANTED)) {
1442                         o->flags |= WANTED;
1443                         add_object_array(o, NULL, want_obj);
1444                 }
1445
1446                 return 1;
1447         }
1448
1449         return 0;
1450 }
1451
1452 static int parse_have(const char *line, struct oid_array *haves)
1453 {
1454         const char *arg;
1455         if (skip_prefix(line, "have ", &arg)) {
1456                 struct object_id oid;
1457
1458                 if (get_oid_hex(arg, &oid))
1459                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1460                 oid_array_append(haves, &oid);
1461                 return 1;
1462         }
1463
1464         return 0;
1465 }
1466
1467 static void process_args(struct packet_reader *request,
1468                          struct upload_pack_data *data)
1469 {
1470         while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1471                 const char *arg = request->line;
1472                 const char *p;
1473
1474                 /* process want */
1475                 if (parse_want(&data->writer, arg, &data->want_obj))
1476                         continue;
1477                 if (data->allow_ref_in_want &&
1478                     parse_want_ref(&data->writer, arg, &data->wanted_refs,
1479                                    &data->want_obj))
1480                         continue;
1481                 /* process have line */
1482                 if (parse_have(arg, &data->haves))
1483                         continue;
1484
1485                 /* process args like thin-pack */
1486                 if (!strcmp(arg, "thin-pack")) {
1487                         data->use_thin_pack = 1;
1488                         continue;
1489                 }
1490                 if (!strcmp(arg, "ofs-delta")) {
1491                         data->use_ofs_delta = 1;
1492                         continue;
1493                 }
1494                 if (!strcmp(arg, "no-progress")) {
1495                         data->no_progress = 1;
1496                         continue;
1497                 }
1498                 if (!strcmp(arg, "include-tag")) {
1499                         data->use_include_tag = 1;
1500                         continue;
1501                 }
1502                 if (!strcmp(arg, "done")) {
1503                         data->done = 1;
1504                         continue;
1505                 }
1506
1507                 /* Shallow related arguments */
1508                 if (process_shallow(arg, &data->shallows))
1509                         continue;
1510                 if (process_deepen(arg, &data->depth))
1511                         continue;
1512                 if (process_deepen_since(arg, &data->deepen_since,
1513                                          &data->deepen_rev_list))
1514                         continue;
1515                 if (process_deepen_not(arg, &data->deepen_not,
1516                                        &data->deepen_rev_list))
1517                         continue;
1518                 if (!strcmp(arg, "deepen-relative")) {
1519                         data->deepen_relative = 1;
1520                         continue;
1521                 }
1522
1523                 if (data->allow_filter && skip_prefix(arg, "filter ", &p)) {
1524                         list_objects_filter_die_if_populated(&data->filter_options);
1525                         parse_list_objects_filter(&data->filter_options, p);
1526                         die_if_using_banned_filter(data);
1527                         continue;
1528                 }
1529
1530                 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1531                      data->allow_sideband_all) &&
1532                     !strcmp(arg, "sideband-all")) {
1533                         data->writer.use_sideband = 1;
1534                         continue;
1535                 }
1536
1537                 if (skip_prefix(arg, "packfile-uris ", &p)) {
1538                         string_list_split(&data->uri_protocols, p, ',', -1);
1539                         continue;
1540                 }
1541
1542                 /* ignore unknown lines maybe? */
1543                 die("unexpected line: '%s'", arg);
1544         }
1545
1546         if (data->uri_protocols.nr && !data->writer.use_sideband)
1547                 string_list_clear(&data->uri_protocols, 0);
1548
1549         if (request->status != PACKET_READ_FLUSH)
1550                 die(_("expected flush after fetch arguments"));
1551 }
1552
1553 static int process_haves(struct upload_pack_data *data, struct oid_array *common)
1554 {
1555         int i;
1556
1557         /* Process haves */
1558         for (i = 0; i < data->haves.nr; i++) {
1559                 const struct object_id *oid = &data->haves.oid[i];
1560
1561                 if (!has_object_file_with_flags(oid,
1562                                                 OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
1563                         continue;
1564
1565                 oid_array_append(common, oid);
1566
1567                 do_got_oid(data, oid);
1568         }
1569
1570         return 0;
1571 }
1572
1573 static int send_acks(struct upload_pack_data *data, struct oid_array *acks)
1574 {
1575         int i;
1576
1577         packet_writer_write(&data->writer, "acknowledgments\n");
1578
1579         /* Send Acks */
1580         if (!acks->nr)
1581                 packet_writer_write(&data->writer, "NAK\n");
1582
1583         for (i = 0; i < acks->nr; i++) {
1584                 packet_writer_write(&data->writer, "ACK %s\n",
1585                                     oid_to_hex(&acks->oid[i]));
1586         }
1587
1588         if (ok_to_give_up(data)) {
1589                 /* Send Ready */
1590                 packet_writer_write(&data->writer, "ready\n");
1591                 return 1;
1592         }
1593
1594         return 0;
1595 }
1596
1597 static int process_haves_and_send_acks(struct upload_pack_data *data)
1598 {
1599         struct oid_array common = OID_ARRAY_INIT;
1600         int ret = 0;
1601
1602         process_haves(data, &common);
1603         if (data->done) {
1604                 ret = 1;
1605         } else if (send_acks(data, &common)) {
1606                 packet_writer_delim(&data->writer);
1607                 ret = 1;
1608         } else {
1609                 /* Add Flush */
1610                 packet_writer_flush(&data->writer);
1611                 ret = 0;
1612         }
1613
1614         oid_array_clear(&data->haves);
1615         oid_array_clear(&common);
1616         return ret;
1617 }
1618
1619 static void send_wanted_ref_info(struct upload_pack_data *data)
1620 {
1621         const struct string_list_item *item;
1622
1623         if (!data->wanted_refs.nr)
1624                 return;
1625
1626         packet_writer_write(&data->writer, "wanted-refs\n");
1627
1628         for_each_string_list_item(item, &data->wanted_refs) {
1629                 packet_writer_write(&data->writer, "%s %s\n",
1630                                     oid_to_hex(item->util),
1631                                     item->string);
1632         }
1633
1634         packet_writer_delim(&data->writer);
1635 }
1636
1637 static void send_shallow_info(struct upload_pack_data *data)
1638 {
1639         /* No shallow info needs to be sent */
1640         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1641             !is_repository_shallow(the_repository))
1642                 return;
1643
1644         packet_writer_write(&data->writer, "shallow-info\n");
1645
1646         if (!send_shallow_list(data) &&
1647             is_repository_shallow(the_repository))
1648                 deepen(data, INFINITE_DEPTH);
1649
1650         packet_delim(1);
1651 }
1652
1653 enum fetch_state {
1654         FETCH_PROCESS_ARGS = 0,
1655         FETCH_SEND_ACKS,
1656         FETCH_SEND_PACK,
1657         FETCH_DONE,
1658 };
1659
1660 int upload_pack_v2(struct repository *r, struct strvec *keys,
1661                    struct packet_reader *request)
1662 {
1663         enum fetch_state state = FETCH_PROCESS_ARGS;
1664         struct upload_pack_data data;
1665
1666         clear_object_flags(ALL_FLAGS);
1667
1668         upload_pack_data_init(&data);
1669         data.use_sideband = LARGE_PACKET_MAX;
1670
1671         git_config(upload_pack_config, &data);
1672
1673         while (state != FETCH_DONE) {
1674                 switch (state) {
1675                 case FETCH_PROCESS_ARGS:
1676                         process_args(request, &data);
1677
1678                         if (!data.want_obj.nr) {
1679                                 /*
1680                                  * Request didn't contain any 'want' lines,
1681                                  * guess they didn't want anything.
1682                                  */
1683                                 state = FETCH_DONE;
1684                         } else if (data.haves.nr) {
1685                                 /*
1686                                  * Request had 'have' lines, so lets ACK them.
1687                                  */
1688                                 state = FETCH_SEND_ACKS;
1689                         } else {
1690                                 /*
1691                                  * Request had 'want's but no 'have's so we can
1692                                  * immedietly go to construct and send a pack.
1693                                  */
1694                                 state = FETCH_SEND_PACK;
1695                         }
1696                         break;
1697                 case FETCH_SEND_ACKS:
1698                         if (process_haves_and_send_acks(&data))
1699                                 state = FETCH_SEND_PACK;
1700                         else
1701                                 state = FETCH_DONE;
1702                         break;
1703                 case FETCH_SEND_PACK:
1704                         send_wanted_ref_info(&data);
1705                         send_shallow_info(&data);
1706
1707                         if (data.uri_protocols.nr) {
1708                                 create_pack_file(&data, &data.uri_protocols);
1709                         } else {
1710                                 packet_writer_write(&data.writer, "packfile\n");
1711                                 create_pack_file(&data, NULL);
1712                         }
1713                         state = FETCH_DONE;
1714                         break;
1715                 case FETCH_DONE:
1716                         continue;
1717                 }
1718         }
1719
1720         upload_pack_data_clear(&data);
1721         return 0;
1722 }
1723
1724 int upload_pack_advertise(struct repository *r,
1725                           struct strbuf *value)
1726 {
1727         if (value) {
1728                 int allow_filter_value;
1729                 int allow_ref_in_want;
1730                 int allow_sideband_all_value;
1731                 char *str = NULL;
1732
1733                 strbuf_addstr(value, "shallow");
1734
1735                 if (!repo_config_get_bool(the_repository,
1736                                          "uploadpack.allowfilter",
1737                                          &allow_filter_value) &&
1738                     allow_filter_value)
1739                         strbuf_addstr(value, " filter");
1740
1741                 if (!repo_config_get_bool(the_repository,
1742                                          "uploadpack.allowrefinwant",
1743                                          &allow_ref_in_want) &&
1744                     allow_ref_in_want)
1745                         strbuf_addstr(value, " ref-in-want");
1746
1747                 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1748                     (!repo_config_get_bool(the_repository,
1749                                            "uploadpack.allowsidebandall",
1750                                            &allow_sideband_all_value) &&
1751                      allow_sideband_all_value))
1752                         strbuf_addstr(value, " sideband-all");
1753
1754                 if (!repo_config_get_string(the_repository,
1755                                             "uploadpack.blobpackfileuri",
1756                                             &str) &&
1757                     str) {
1758                         strbuf_addstr(value, " packfile-uris");
1759                         free(str);
1760                 }
1761         }
1762
1763         return 1;
1764 }