git.oblomov.eu Git - git/blob - 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 /* Allow specifying sha1 if it is a ref tip. */
  48 #define ALLOW_TIP_SHA1  01
  49 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  50 #define ALLOW_REACHABLE_SHA1    02
  51 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  52 #define ALLOW_ANY_SHA1  07
  53 static unsigned int allow_unadvertised_object_request;
  54 static int shallow_nr;
  55 static struct object_array extra_edge_obj;
  56
  57 /*
  58  * Please annotate, and if possible group together, fields used only
  59  * for protocol v0 or only for protocol v2.
  60  */
  61 struct upload_pack_data {
  62         struct string_list symref;                              /* v0 only */
  63         struct object_array want_obj;
  64         struct object_array have_obj;
  65         struct oid_array haves;                                 /* v2 only */
  66         struct string_list wanted_refs;                         /* v2 only */
  67
  68         struct object_array shallows;
  69         struct string_list deepen_not;
  70         int depth;
  71         timestamp_t deepen_since;
  72         int deepen_rev_list;
  73         int deepen_relative;
  74         int keepalive;
  75
  76         unsigned int timeout;                                   /* v0 only */
  77         enum {
  78                 NO_MULTI_ACK = 0,
  79                 MULTI_ACK = 1,
  80                 MULTI_ACK_DETAILED = 2
  81         } multi_ack;                                            /* v0 only */
  82
  83         /* 0 for no sideband, otherwise DEFAULT_PACKET_MAX or LARGE_PACKET_MAX */
  84         int use_sideband;
  85
  86         struct string_list uri_protocols;
  87
  88         struct list_objects_filter_options filter_options;
  89
  90         struct packet_writer writer;
  91
  92         const char *pack_objects_hook;
  93
  94         unsigned stateless_rpc : 1;                             /* v0 only */
  95         unsigned no_done : 1;                                   /* v0 only */
  96         unsigned daemon_mode : 1;                               /* v0 only */
  97         unsigned filter_capability_requested : 1;               /* v0 only */
  98
  99         unsigned use_thin_pack : 1;
 100         unsigned use_ofs_delta : 1;
 101         unsigned no_progress : 1;
 102         unsigned use_include_tag : 1;
 103         unsigned allow_filter : 1;
 104
 105         unsigned done : 1;                                      /* v2 only */
 106         unsigned allow_ref_in_want : 1;                         /* v2 only */
 107         unsigned allow_sideband_all : 1;                        /* v2 only */
 108 };
 109
 110 static void upload_pack_data_init(struct upload_pack_data *data)
 111 {
 112         struct string_list symref = STRING_LIST_INIT_DUP;
 113         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
 114         struct object_array want_obj = OBJECT_ARRAY_INIT;
 115         struct object_array have_obj = OBJECT_ARRAY_INIT;
 116         struct oid_array haves = OID_ARRAY_INIT;
 117         struct object_array shallows = OBJECT_ARRAY_INIT;
 118         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 119         struct string_list uri_protocols = STRING_LIST_INIT_DUP;
 120
 121         memset(data, 0, sizeof(*data));
 122         data->symref = symref;
 123         data->wanted_refs = wanted_refs;
 124         data->want_obj = want_obj;
 125         data->have_obj = have_obj;
 126         data->haves = haves;
 127         data->shallows = shallows;
 128         data->deepen_not = deepen_not;
 129         data->uri_protocols = uri_protocols;
 130         packet_writer_init(&data->writer, 1);
 131
 132         data->keepalive = 5;
 133 }
 134
 135 static void upload_pack_data_clear(struct upload_pack_data *data)
 136 {
 137         string_list_clear(&data->symref, 1);
 138         string_list_clear(&data->wanted_refs, 1);
 139         object_array_clear(&data->want_obj);
 140         object_array_clear(&data->have_obj);
 141         oid_array_clear(&data->haves);
 142         object_array_clear(&data->shallows);
 143         string_list_clear(&data->deepen_not, 0);
 144         list_objects_filter_release(&data->filter_options);
 145
 146         free((char *)data->pack_objects_hook);
 147 }
 148
 149 static void reset_timeout(unsigned int timeout)
 150 {
 151         alarm(timeout);
 152 }
 153
 154 static void send_client_data(int fd, const char *data, ssize_t sz,
 155                              int use_sideband)
 156 {
 157         if (use_sideband) {
 158                 send_sideband(1, fd, data, sz, use_sideband);
 159                 return;
 160         }
 161         if (fd == 3)
 162                 /* emergency quit */
 163                 fd = 2;
 164         if (fd == 2) {
 165                 /* XXX: are we happy to lose stuff here? */
 166                 xwrite(fd, data, sz);
 167                 return;
 168         }
 169         write_or_die(fd, data, sz);
 170 }
 171
 172 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
 173 {
 174         FILE *fp = cb_data;
 175         if (graft->nr_parent == -1)
 176                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
 177         return 0;
 178 }
 179
 180 struct output_state {
 181         char buffer[8193];
 182         int used;
 183         unsigned packfile_uris_started : 1;
 184         unsigned packfile_started : 1;
 185 };
 186
 187 static int relay_pack_data(int pack_objects_out, struct output_state *os,
 188                            int use_sideband, int write_packfile_line)
 189 {
 190         /*
 191          * We keep the last byte to ourselves
 192          * in case we detect broken rev-list, so that we
 193          * can leave the stream corrupted.  This is
 194          * unfortunate -- unpack-objects would happily
 195          * accept a valid packdata with trailing garbage,
 196          * so appending garbage after we pass all the
 197          * pack data is not good enough to signal
 198          * breakage to downstream.
 199          */
 200         ssize_t readsz;
 201
 202         readsz = xread(pack_objects_out, os->buffer + os->used,
 203                        sizeof(os->buffer) - os->used);
 204         if (readsz < 0) {
 205                 return readsz;
 206         }
 207         os->used += readsz;
 208
 209         while (!os->packfile_started) {
 210                 char *p;
 211                 if (os->used >= 4 && !memcmp(os->buffer, "PACK", 4)) {
 212                         os->packfile_started = 1;
 213                         if (write_packfile_line) {
 214                                 if (os->packfile_uris_started)
 215                                         packet_delim(1);
 216                                 packet_write_fmt(1, "\1packfile\n");
 217                         }
 218                         break;
 219                 }
 220                 if ((p = memchr(os->buffer, '\n', os->used))) {
 221                         if (!os->packfile_uris_started) {
 222                                 os->packfile_uris_started = 1;
 223                                 if (!write_packfile_line)
 224                                         BUG("packfile_uris requires sideband-all");
 225                                 packet_write_fmt(1, "\1packfile-uris\n");
 226                         }
 227                         *p = '\0';
 228                         packet_write_fmt(1, "\1%s\n", os->buffer);
 229
 230                         os->used -= p - os->buffer + 1;
 231                         memmove(os->buffer, p + 1, os->used);
 232                 } else {
 233                         /*
 234                          * Incomplete line.
 235                          */
 236                         return readsz;
 237                 }
 238         }
 239
 240         if (os->used > 1) {
 241                 send_client_data(1, os->buffer, os->used - 1, use_sideband);
 242                 os->buffer[0] = os->buffer[os->used - 1];
 243                 os->used = 1;
 244         } else {
 245                 send_client_data(1, os->buffer, os->used, use_sideband);
 246                 os->used = 0;
 247         }
 248
 249         return readsz;
 250 }
 251
 252 static void create_pack_file(struct upload_pack_data *pack_data,
 253                              const struct string_list *uri_protocols)
 254 {
 255         struct child_process pack_objects = CHILD_PROCESS_INIT;
 256         struct output_state output_state = { { 0 } };
 257         char progress[128];
 258         char abort_msg[] = "aborting due to possible repository "
 259                 "corruption on the remote side.";
 260         ssize_t sz;
 261         int i;
 262         FILE *pipe_fd;
 263
 264         if (!pack_data->pack_objects_hook)
 265                 pack_objects.git_cmd = 1;
 266         else {
 267                 argv_array_push(&pack_objects.args, pack_data->pack_objects_hook);
 268                 argv_array_push(&pack_objects.args, "git");
 269                 pack_objects.use_shell = 1;
 270         }
 271
 272         if (shallow_nr) {
 273                 argv_array_push(&pack_objects.args, "--shallow-file");
 274                 argv_array_push(&pack_objects.args, "");
 275         }
 276         argv_array_push(&pack_objects.args, "pack-objects");
 277         argv_array_push(&pack_objects.args, "--revs");
 278         if (pack_data->use_thin_pack)
 279                 argv_array_push(&pack_objects.args, "--thin");
 280
 281         argv_array_push(&pack_objects.args, "--stdout");
 282         if (shallow_nr)
 283                 argv_array_push(&pack_objects.args, "--shallow");
 284         if (!pack_data->no_progress)
 285                 argv_array_push(&pack_objects.args, "--progress");
 286         if (pack_data->use_ofs_delta)
 287                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 288         if (pack_data->use_include_tag)
 289                 argv_array_push(&pack_objects.args, "--include-tag");
 290         if (pack_data->filter_options.choice) {
 291                 const char *spec =
 292                         expand_list_objects_filter_spec(&pack_data->filter_options);
 293                 if (pack_objects.use_shell) {
 294                         struct strbuf buf = STRBUF_INIT;
 295                         sq_quote_buf(&buf, spec);
 296                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 297                         strbuf_release(&buf);
 298                 } else {
 299                         argv_array_pushf(&pack_objects.args, "--filter=%s",
 300                                          spec);
 301                 }
 302         }
 303         if (uri_protocols) {
 304                 for (i = 0; i < uri_protocols->nr; i++)
 305                         argv_array_pushf(&pack_objects.args, "--uri-protocol=%s",
 306                                          uri_protocols->items[i].string);
 307         }
 308
 309         pack_objects.in = -1;
 310         pack_objects.out = -1;
 311         pack_objects.err = -1;
 312
 313         if (start_command(&pack_objects))
 314                 die("git upload-pack: unable to fork git-pack-objects");
 315
 316         pipe_fd = xfdopen(pack_objects.in, "w");
 317
 318         if (shallow_nr)
 319                 for_each_commit_graft(write_one_shallow, pipe_fd);
 320
 321         for (i = 0; i < pack_data->want_obj.nr; i++)
 322                 fprintf(pipe_fd, "%s\n",
 323                         oid_to_hex(&pack_data->want_obj.objects[i].item->oid));
 324         fprintf(pipe_fd, "--not\n");
 325         for (i = 0; i < pack_data->have_obj.nr; i++)
 326                 fprintf(pipe_fd, "%s\n",
 327                         oid_to_hex(&pack_data->have_obj.objects[i].item->oid));
 328         for (i = 0; i < extra_edge_obj.nr; i++)
 329                 fprintf(pipe_fd, "%s\n",
 330                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 331         fprintf(pipe_fd, "\n");
 332         fflush(pipe_fd);
 333         fclose(pipe_fd);
 334
 335         /* We read from pack_objects.err to capture stderr output for
 336          * progress bar, and pack_objects.out to capture the pack data.
 337          */
 338
 339         while (1) {
 340                 struct pollfd pfd[2];
 341                 int pe, pu, pollsize, polltimeout;
 342                 int ret;
 343
 344                 reset_timeout(pack_data->timeout);
 345
 346                 pollsize = 0;
 347                 pe = pu = -1;
 348
 349                 if (0 <= pack_objects.out) {
 350                         pfd[pollsize].fd = pack_objects.out;
 351                         pfd[pollsize].events = POLLIN;
 352                         pu = pollsize;
 353                         pollsize++;
 354                 }
 355                 if (0 <= pack_objects.err) {
 356                         pfd[pollsize].fd = pack_objects.err;
 357                         pfd[pollsize].events = POLLIN;
 358                         pe = pollsize;
 359                         pollsize++;
 360                 }
 361
 362                 if (!pollsize)
 363                         break;
 364
 365                 polltimeout = pack_data->keepalive < 0
 366                         ? -1
 367                         : 1000 * pack_data->keepalive;
 368
 369                 ret = poll(pfd, pollsize, polltimeout);
 370
 371                 if (ret < 0) {
 372                         if (errno != EINTR) {
 373                                 error_errno("poll failed, resuming");
 374                                 sleep(1);
 375                         }
 376                         continue;
 377                 }
 378                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 379                         /* Status ready; we ship that in the side-band
 380                          * or dump to the standard error.
 381                          */
 382                         sz = xread(pack_objects.err, progress,
 383                                   sizeof(progress));
 384                         if (0 < sz)
 385                                 send_client_data(2, progress, sz,
 386                                                  pack_data->use_sideband);
 387                         else if (sz == 0) {
 388                                 close(pack_objects.err);
 389                                 pack_objects.err = -1;
 390                         }
 391                         else
 392                                 goto fail;
 393                         /* give priority to status messages */
 394                         continue;
 395                 }
 396                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 397                         int result = relay_pack_data(pack_objects.out,
 398                                                      &output_state,
 399                                                      pack_data->use_sideband,
 400                                                      !!uri_protocols);
 401
 402                         if (result == 0) {
 403                                 close(pack_objects.out);
 404                                 pack_objects.out = -1;
 405                         } else if (result < 0) {
 406                                 goto fail;
 407                         }
 408                 }
 409
 410                 /*
 411                  * We hit the keepalive timeout without saying anything; send
 412                  * an empty message on the data sideband just to let the other
 413                  * side know we're still working on it, but don't have any data
 414                  * yet.
 415                  *
 416                  * If we don't have a sideband channel, there's no room in the
 417                  * protocol to say anything, so those clients are just out of
 418                  * luck.
 419                  */
 420                 if (!ret && pack_data->use_sideband) {
 421                         static const char buf[] = "0005\1";
 422                         write_or_die(1, buf, 5);
 423                 }
 424         }
 425
 426         if (finish_command(&pack_objects)) {
 427                 error("git upload-pack: git-pack-objects died with error.");
 428                 goto fail;
 429         }
 430
 431         /* flush the data */
 432         if (output_state.used > 0) {
 433                 send_client_data(1, output_state.buffer, output_state.used,
 434                                  pack_data->use_sideband);
 435                 fprintf(stderr, "flushed.\n");
 436         }
 437         if (pack_data->use_sideband)
 438                 packet_flush(1);
 439         return;
 440
 441  fail:
 442         send_client_data(3, abort_msg, sizeof(abort_msg),
 443                          pack_data->use_sideband);
 444         die("git upload-pack: %s", abort_msg);
 445 }
 446
 447 static int got_oid(const char *hex, struct object_id *oid,
 448                    struct object_array *have_obj)
 449 {
 450         struct object *o;
 451         int we_knew_they_have = 0;
 452
 453         if (get_oid_hex(hex, oid))
 454                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 455         if (!has_object_file(oid))
 456                 return -1;
 457
 458         o = parse_object(the_repository, oid);
 459         if (!o)
 460                 die("oops (%s)", oid_to_hex(oid));
 461         if (o->type == OBJ_COMMIT) {
 462                 struct commit_list *parents;
 463                 struct commit *commit = (struct commit *)o;
 464                 if (o->flags & THEY_HAVE)
 465                         we_knew_they_have = 1;
 466                 else
 467                         o->flags |= THEY_HAVE;
 468                 if (!oldest_have || (commit->date < oldest_have))
 469                         oldest_have = commit->date;
 470                 for (parents = commit->parents;
 471                      parents;
 472                      parents = parents->next)
 473                         parents->item->object.flags |= THEY_HAVE;
 474         }
 475         if (!we_knew_they_have) {
 476                 add_object_array(o, NULL, have_obj);
 477                 return 1;
 478         }
 479         return 0;
 480 }
 481
 482 static int ok_to_give_up(const struct object_array *have_obj,
 483                          struct object_array *want_obj)
 484 {
 485         uint32_t min_generation = GENERATION_NUMBER_ZERO;
 486
 487         if (!have_obj->nr)
 488                 return 0;
 489
 490         return can_all_from_reach_with_flag(want_obj, THEY_HAVE,
 491                                             COMMON_KNOWN, oldest_have,
 492                                             min_generation);
 493 }
 494
 495 static int get_common_commits(struct upload_pack_data *data,
 496                               struct packet_reader *reader)
 497 {
 498         struct object_id oid;
 499         char last_hex[GIT_MAX_HEXSZ + 1];
 500         int got_common = 0;
 501         int got_other = 0;
 502         int sent_ready = 0;
 503
 504         save_commit_buffer = 0;
 505
 506         for (;;) {
 507                 const char *arg;
 508
 509                 reset_timeout(data->timeout);
 510
 511                 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
 512                         if (data->multi_ack == MULTI_ACK_DETAILED
 513                             && got_common
 514                             && !got_other
 515                             && ok_to_give_up(&data->have_obj, &data->want_obj)) {
 516                                 sent_ready = 1;
 517                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 518                         }
 519                         if (data->have_obj.nr == 0 || data->multi_ack)
 520                                 packet_write_fmt(1, "NAK\n");
 521
 522                         if (data->no_done && sent_ready) {
 523                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 524                                 return 0;
 525                         }
 526                         if (data->stateless_rpc)
 527                                 exit(0);
 528                         got_common = 0;
 529                         got_other = 0;
 530                         continue;
 531                 }
 532                 if (skip_prefix(reader->line, "have ", &arg)) {
 533                         switch (got_oid(arg, &oid, &data->have_obj)) {
 534                         case -1: /* they have what we do not */
 535                                 got_other = 1;
 536                                 if (data->multi_ack
 537                                     && ok_to_give_up(&data->have_obj, &data->want_obj)) {
 538                                         const char *hex = oid_to_hex(&oid);
 539                                         if (data->multi_ack == MULTI_ACK_DETAILED) {
 540                                                 sent_ready = 1;
 541                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 542                                         } else
 543                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 544                                 }
 545                                 break;
 546                         default:
 547                                 got_common = 1;
 548                                 oid_to_hex_r(last_hex, &oid);
 549                                 if (data->multi_ack == MULTI_ACK_DETAILED)
 550                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 551                                 else if (data->multi_ack)
 552                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 553                                 else if (data->have_obj.nr == 1)
 554                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 555                                 break;
 556                         }
 557                         continue;
 558                 }
 559                 if (!strcmp(reader->line, "done")) {
 560                         if (data->have_obj.nr > 0) {
 561                                 if (data->multi_ack)
 562                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 563                                 return 0;
 564                         }
 565                         packet_write_fmt(1, "NAK\n");
 566                         return -1;
 567                 }
 568                 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
 569         }
 570 }
 571
 572 static int is_our_ref(struct object *o)
 573 {
 574         int allow_hidden_ref = (allow_unadvertised_object_request &
 575                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 576         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 577 }
 578
 579 /*
 580  * on successful case, it's up to the caller to close cmd->out
 581  */
 582 static int do_reachable_revlist(struct child_process *cmd,
 583                                 struct object_array *src,
 584                                 struct object_array *reachable)
 585 {
 586         static const char *argv[] = {
 587                 "rev-list", "--stdin", NULL,
 588         };
 589         struct object *o;
 590         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 591         int i;
 592         const unsigned hexsz = the_hash_algo->hexsz;
 593
 594         cmd->argv = argv;
 595         cmd->git_cmd = 1;
 596         cmd->no_stderr = 1;
 597         cmd->in = -1;
 598         cmd->out = -1;
 599
 600         /*
 601          * If the next rev-list --stdin encounters an unknown commit,
 602          * it terminates, which will cause SIGPIPE in the write loop
 603          * below.
 604          */
 605         sigchain_push(SIGPIPE, SIG_IGN);
 606
 607         if (start_command(cmd))
 608                 goto error;
 609
 610         namebuf[0] = '^';
 611         namebuf[hexsz + 1] = '\n';
 612         for (i = get_max_object_index(); 0 < i; ) {
 613                 o = get_indexed_object(--i);
 614                 if (!o)
 615                         continue;
 616                 if (reachable && o->type == OBJ_COMMIT)
 617                         o->flags &= ~TMP_MARK;
 618                 if (!is_our_ref(o))
 619                         continue;
 620                 memcpy(namebuf + 1, oid_to_hex(&o->oid), hexsz);
 621                 if (write_in_full(cmd->in, namebuf, hexsz + 2) < 0)
 622                         goto error;
 623         }
 624         namebuf[hexsz] = '\n';
 625         for (i = 0; i < src->nr; i++) {
 626                 o = src->objects[i].item;
 627                 if (is_our_ref(o)) {
 628                         if (reachable)
 629                                 add_object_array(o, NULL, reachable);
 630                         continue;
 631                 }
 632                 if (reachable && o->type == OBJ_COMMIT)
 633                         o->flags |= TMP_MARK;
 634                 memcpy(namebuf, oid_to_hex(&o->oid), hexsz);
 635                 if (write_in_full(cmd->in, namebuf, hexsz + 1) < 0)
 636                         goto error;
 637         }
 638         close(cmd->in);
 639         cmd->in = -1;
 640         sigchain_pop(SIGPIPE);
 641
 642         return 0;
 643
 644 error:
 645         sigchain_pop(SIGPIPE);
 646
 647         if (cmd->in >= 0)
 648                 close(cmd->in);
 649         if (cmd->out >= 0)
 650                 close(cmd->out);
 651         return -1;
 652 }
 653
 654 static int get_reachable_list(struct object_array *src,
 655                               struct object_array *reachable)
 656 {
 657         struct child_process cmd = CHILD_PROCESS_INIT;
 658         int i;
 659         struct object *o;
 660         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 661         const unsigned hexsz = the_hash_algo->hexsz;
 662
 663         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 664                 return -1;
 665
 666         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 667                 struct object_id oid;
 668                 const char *p;
 669
 670                 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
 671                         break;
 672
 673                 o = lookup_object(the_repository, &oid);
 674                 if (o && o->type == OBJ_COMMIT) {
 675                         o->flags &= ~TMP_MARK;
 676                 }
 677         }
 678         for (i = get_max_object_index(); 0 < i; i--) {
 679                 o = get_indexed_object(i - 1);
 680                 if (o && o->type == OBJ_COMMIT &&
 681                     (o->flags & TMP_MARK)) {
 682                         add_object_array(o, NULL, reachable);
 683                                 o->flags &= ~TMP_MARK;
 684                 }
 685         }
 686         close(cmd.out);
 687
 688         if (finish_command(&cmd))
 689                 return -1;
 690
 691         return 0;
 692 }
 693
 694 static int has_unreachable(struct object_array *src)
 695 {
 696         struct child_process cmd = CHILD_PROCESS_INIT;
 697         char buf[1];
 698         int i;
 699
 700         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 701                 return 1;
 702
 703         /*
 704          * The commits out of the rev-list are not ancestors of
 705          * our ref.
 706          */
 707         i = read_in_full(cmd.out, buf, 1);
 708         if (i)
 709                 goto error;
 710         close(cmd.out);
 711         cmd.out = -1;
 712
 713         /*
 714          * rev-list may have died by encountering a bad commit
 715          * in the history, in which case we do want to bail out
 716          * even when it showed no commit.
 717          */
 718         if (finish_command(&cmd))
 719                 goto error;
 720
 721         /* All the non-tip ones are ancestors of what we advertised */
 722         return 0;
 723
 724 error:
 725         sigchain_pop(SIGPIPE);
 726         if (cmd.out >= 0)
 727                 close(cmd.out);
 728         return 1;
 729 }
 730
 731 static void check_non_tip(struct upload_pack_data *data)
 732 {
 733         int i;
 734
 735         /*
 736          * In the normal in-process case without
 737          * uploadpack.allowReachableSHA1InWant,
 738          * non-tip requests can never happen.
 739          */
 740         if (!data->stateless_rpc
 741             && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 742                 goto error;
 743         if (!has_unreachable(&data->want_obj))
 744                 /* All the non-tip ones are ancestors of what we advertised */
 745                 return;
 746
 747 error:
 748         /* Pick one of them (we know there at least is one) */
 749         for (i = 0; i < data->want_obj.nr; i++) {
 750                 struct object *o = data->want_obj.objects[i].item;
 751                 if (!is_our_ref(o)) {
 752                         packet_writer_error(&data->writer,
 753                                             "upload-pack: not our ref %s",
 754                                             oid_to_hex(&o->oid));
 755                         die("git upload-pack: not our ref %s",
 756                             oid_to_hex(&o->oid));
 757                 }
 758         }
 759 }
 760
 761 static void send_shallow(struct packet_writer *writer,
 762                          struct commit_list *result)
 763 {
 764         while (result) {
 765                 struct object *object = &result->item->object;
 766                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 767                         packet_writer_write(writer, "shallow %s",
 768                                             oid_to_hex(&object->oid));
 769                         register_shallow(the_repository, &object->oid);
 770                         shallow_nr++;
 771                 }
 772                 result = result->next;
 773         }
 774 }
 775
 776 static void send_unshallow(struct packet_writer *writer,
 777                            const struct object_array *shallows,
 778                            struct object_array *want_obj)
 779 {
 780         int i;
 781
 782         for (i = 0; i < shallows->nr; i++) {
 783                 struct object *object = shallows->objects[i].item;
 784                 if (object->flags & NOT_SHALLOW) {
 785                         struct commit_list *parents;
 786                         packet_writer_write(writer, "unshallow %s",
 787                                             oid_to_hex(&object->oid));
 788                         object->flags &= ~CLIENT_SHALLOW;
 789                         /*
 790                          * We want to _register_ "object" as shallow, but we
 791                          * also need to traverse object's parents to deepen a
 792                          * shallow clone. Unregister it for now so we can
 793                          * parse and add the parents to the want list, then
 794                          * re-register it.
 795                          */
 796                         unregister_shallow(&object->oid);
 797                         object->parsed = 0;
 798                         parse_commit_or_die((struct commit *)object);
 799                         parents = ((struct commit *)object)->parents;
 800                         while (parents) {
 801                                 add_object_array(&parents->item->object,
 802                                                  NULL, want_obj);
 803                                 parents = parents->next;
 804                         }
 805                         add_object_array(object, NULL, &extra_edge_obj);
 806                 }
 807                 /* make sure commit traversal conforms to client */
 808                 register_shallow(the_repository, &object->oid);
 809         }
 810 }
 811
 812 static int check_ref(const char *refname_full, const struct object_id *oid,
 813                      int flag, void *cb_data);
 814 static void deepen(struct packet_writer *writer, int depth, int deepen_relative,
 815                    struct object_array *shallows, struct object_array *want_obj)
 816 {
 817         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 818                 int i;
 819
 820                 for (i = 0; i < shallows->nr; i++) {
 821                         struct object *object = shallows->objects[i].item;
 822                         object->flags |= NOT_SHALLOW;
 823                 }
 824         } else if (deepen_relative) {
 825                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 826                 struct commit_list *result;
 827
 828                 /*
 829                  * Checking for reachable shallows requires that our refs be
 830                  * marked with OUR_REF.
 831                  */
 832                 head_ref_namespaced(check_ref, NULL);
 833                 for_each_namespaced_ref(check_ref, NULL);
 834
 835                 get_reachable_list(shallows, &reachable_shallows);
 836                 result = get_shallow_commits(&reachable_shallows,
 837                                              depth + 1,
 838                                              SHALLOW, NOT_SHALLOW);
 839                 send_shallow(writer, result);
 840                 free_commit_list(result);
 841                 object_array_clear(&reachable_shallows);
 842         } else {
 843                 struct commit_list *result;
 844
 845                 result = get_shallow_commits(want_obj, depth,
 846                                              SHALLOW, NOT_SHALLOW);
 847                 send_shallow(writer, result);
 848                 free_commit_list(result);
 849         }
 850
 851         send_unshallow(writer, shallows, want_obj);
 852 }
 853
 854 static void deepen_by_rev_list(struct packet_writer *writer, int ac,
 855                                const char **av,
 856                                struct object_array *shallows,
 857                                struct object_array *want_obj)
 858 {
 859         struct commit_list *result;
 860
 861         disable_commit_graph(the_repository);
 862         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 863         send_shallow(writer, result);
 864         free_commit_list(result);
 865         send_unshallow(writer, shallows, want_obj);
 866 }
 867
 868 /* Returns 1 if a shallow list is sent or 0 otherwise */
 869 static int send_shallow_list(struct packet_writer *writer,
 870                              int depth, int deepen_rev_list,
 871                              timestamp_t deepen_since,
 872                              struct string_list *deepen_not,
 873                              int deepen_relative,
 874                              struct object_array *shallows,
 875                              struct object_array *want_obj)
 876 {
 877         int ret = 0;
 878
 879         if (depth > 0 && deepen_rev_list)
 880                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 881         if (depth > 0) {
 882                 deepen(writer, depth, deepen_relative, shallows, want_obj);
 883                 ret = 1;
 884         } else if (deepen_rev_list) {
 885                 struct argv_array av = ARGV_ARRAY_INIT;
 886                 int i;
 887
 888                 argv_array_push(&av, "rev-list");
 889                 if (deepen_since)
 890                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 891                 if (deepen_not->nr) {
 892                         argv_array_push(&av, "--not");
 893                         for (i = 0; i < deepen_not->nr; i++) {
 894                                 struct string_list_item *s = deepen_not->items + i;
 895                                 argv_array_push(&av, s->string);
 896                         }
 897                         argv_array_push(&av, "--not");
 898                 }
 899                 for (i = 0; i < want_obj->nr; i++) {
 900                         struct object *o = want_obj->objects[i].item;
 901                         argv_array_push(&av, oid_to_hex(&o->oid));
 902                 }
 903                 deepen_by_rev_list(writer, av.argc, av.argv, shallows, want_obj);
 904                 argv_array_clear(&av);
 905                 ret = 1;
 906         } else {
 907                 if (shallows->nr > 0) {
 908                         int i;
 909                         for (i = 0; i < shallows->nr; i++)
 910                                 register_shallow(the_repository,
 911                                                  &shallows->objects[i].item->oid);
 912                 }
 913         }
 914
 915         shallow_nr += shallows->nr;
 916         return ret;
 917 }
 918
 919 static int process_shallow(const char *line, struct object_array *shallows)
 920 {
 921         const char *arg;
 922         if (skip_prefix(line, "shallow ", &arg)) {
 923                 struct object_id oid;
 924                 struct object *object;
 925                 if (get_oid_hex(arg, &oid))
 926                         die("invalid shallow line: %s", line);
 927                 object = parse_object(the_repository, &oid);
 928                 if (!object)
 929                         return 1;
 930                 if (object->type != OBJ_COMMIT)
 931                         die("invalid shallow object %s", oid_to_hex(&oid));
 932                 if (!(object->flags & CLIENT_SHALLOW)) {
 933                         object->flags |= CLIENT_SHALLOW;
 934                         add_object_array(object, NULL, shallows);
 935                 }
 936                 return 1;
 937         }
 938
 939         return 0;
 940 }
 941
 942 static int process_deepen(const char *line, int *depth)
 943 {
 944         const char *arg;
 945         if (skip_prefix(line, "deepen ", &arg)) {
 946                 char *end = NULL;
 947                 *depth = (int)strtol(arg, &end, 0);
 948                 if (!end || *end || *depth <= 0)
 949                         die("Invalid deepen: %s", line);
 950                 return 1;
 951         }
 952
 953         return 0;
 954 }
 955
 956 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 957 {
 958         const char *arg;
 959         if (skip_prefix(line, "deepen-since ", &arg)) {
 960                 char *end = NULL;
 961                 *deepen_since = parse_timestamp(arg, &end, 0);
 962                 if (!end || *end || !deepen_since ||
 963                     /* revisions.c's max_age -1 is special */
 964                     *deepen_since == -1)
 965                         die("Invalid deepen-since: %s", line);
 966                 *deepen_rev_list = 1;
 967                 return 1;
 968         }
 969         return 0;
 970 }
 971
 972 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 973 {
 974         const char *arg;
 975         if (skip_prefix(line, "deepen-not ", &arg)) {
 976                 char *ref = NULL;
 977                 struct object_id oid;
 978                 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
 979                         die("git upload-pack: ambiguous deepen-not: %s", line);
 980                 string_list_append(deepen_not, ref);
 981                 free(ref);
 982                 *deepen_rev_list = 1;
 983                 return 1;
 984         }
 985         return 0;
 986 }
 987
 988 static void receive_needs(struct upload_pack_data *data,
 989                           struct packet_reader *reader)
 990 {
 991         int has_non_tip = 0;
 992
 993         shallow_nr = 0;
 994         for (;;) {
 995                 struct object *o;
 996                 const char *features;
 997                 struct object_id oid_buf;
 998                 const char *arg;
 999
1000                 reset_timeout(data->timeout);
1001                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
1002                         break;
1003
1004                 if (process_shallow(reader->line, &data->shallows))
1005                         continue;
1006                 if (process_deepen(reader->line, &data->depth))
1007                         continue;
1008                 if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
1009                         continue;
1010                 if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
1011                         continue;
1012
1013                 if (skip_prefix(reader->line, "filter ", &arg)) {
1014                         if (!data->filter_capability_requested)
1015                                 die("git upload-pack: filtering capability not negotiated");
1016                         list_objects_filter_die_if_populated(&data->filter_options);
1017                         parse_list_objects_filter(&data->filter_options, arg);
1018                         continue;
1019                 }
1020
1021                 if (!skip_prefix(reader->line, "want ", &arg) ||
1022                     parse_oid_hex(arg, &oid_buf, &features))
1023                         die("git upload-pack: protocol error, "
1024                             "expected to get object ID, not '%s'", reader->line);
1025
1026                 if (parse_feature_request(features, "deepen-relative"))
1027                         data->deepen_relative = 1;
1028                 if (parse_feature_request(features, "multi_ack_detailed"))
1029                         data->multi_ack = MULTI_ACK_DETAILED;
1030                 else if (parse_feature_request(features, "multi_ack"))
1031                         data->multi_ack = MULTI_ACK;
1032                 if (parse_feature_request(features, "no-done"))
1033                         data->no_done = 1;
1034                 if (parse_feature_request(features, "thin-pack"))
1035                         data->use_thin_pack = 1;
1036                 if (parse_feature_request(features, "ofs-delta"))
1037                         data->use_ofs_delta = 1;
1038                 if (parse_feature_request(features, "side-band-64k"))
1039                         data->use_sideband = LARGE_PACKET_MAX;
1040                 else if (parse_feature_request(features, "side-band"))
1041                         data->use_sideband = DEFAULT_PACKET_MAX;
1042                 if (parse_feature_request(features, "no-progress"))
1043                         data->no_progress = 1;
1044                 if (parse_feature_request(features, "include-tag"))
1045                         data->use_include_tag = 1;
1046                 if (data->allow_filter &&
1047                     parse_feature_request(features, "filter"))
1048                         data->filter_capability_requested = 1;
1049
1050                 o = parse_object(the_repository, &oid_buf);
1051                 if (!o) {
1052                         packet_writer_error(&data->writer,
1053                                             "upload-pack: not our ref %s",
1054                                             oid_to_hex(&oid_buf));
1055                         die("git upload-pack: not our ref %s",
1056                             oid_to_hex(&oid_buf));
1057                 }
1058                 if (!(o->flags & WANTED)) {
1059                         o->flags |= WANTED;
1060                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
1061                               || is_our_ref(o)))
1062                                 has_non_tip = 1;
1063                         add_object_array(o, NULL, &data->want_obj);
1064                 }
1065         }
1066
1067         /*
1068          * We have sent all our refs already, and the other end
1069          * should have chosen out of them. When we are operating
1070          * in the stateless RPC mode, however, their choice may
1071          * have been based on the set of older refs advertised
1072          * by another process that handled the initial request.
1073          */
1074         if (has_non_tip)
1075                 check_non_tip(data);
1076
1077         if (!data->use_sideband && data->daemon_mode)
1078                 data->no_progress = 1;
1079
1080         if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1081                 return;
1082
1083         if (send_shallow_list(&data->writer,
1084                               data->depth,
1085                               data->deepen_rev_list,
1086                               data->deepen_since,
1087                               &data->deepen_not,
1088                               data->deepen_relative,
1089                               &data->shallows,
1090                               &data->want_obj))
1091                 packet_flush(1);
1092 }
1093
1094 /* return non-zero if the ref is hidden, otherwise 0 */
1095 static int mark_our_ref(const char *refname, const char *refname_full,
1096                         const struct object_id *oid)
1097 {
1098         struct object *o = lookup_unknown_object(oid);
1099
1100         if (ref_is_hidden(refname, refname_full)) {
1101                 o->flags |= HIDDEN_REF;
1102                 return 1;
1103         }
1104         o->flags |= OUR_REF;
1105         return 0;
1106 }
1107
1108 static int check_ref(const char *refname_full, const struct object_id *oid,
1109                      int flag, void *cb_data)
1110 {
1111         const char *refname = strip_namespace(refname_full);
1112
1113         mark_our_ref(refname, refname_full, oid);
1114         return 0;
1115 }
1116
1117 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1118 {
1119         struct string_list_item *item;
1120
1121         if (!symref->nr)
1122                 return;
1123         for_each_string_list_item(item, symref)
1124                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1125 }
1126
1127 static int send_ref(const char *refname, const struct object_id *oid,
1128                     int flag, void *cb_data)
1129 {
1130         static const char *capabilities = "multi_ack thin-pack side-band"
1131                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1132                 " deepen-relative no-progress include-tag multi_ack_detailed";
1133         const char *refname_nons = strip_namespace(refname);
1134         struct object_id peeled;
1135         struct upload_pack_data *data = cb_data;
1136
1137         if (mark_our_ref(refname_nons, refname, oid))
1138                 return 0;
1139
1140         if (capabilities) {
1141                 struct strbuf symref_info = STRBUF_INIT;
1142
1143                 format_symref_info(&symref_info, &data->symref);
1144                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
1145                              oid_to_hex(oid), refname_nons,
1146                              0, capabilities,
1147                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
1148                                      " allow-tip-sha1-in-want" : "",
1149                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
1150                                      " allow-reachable-sha1-in-want" : "",
1151                              data->stateless_rpc ? " no-done" : "",
1152                              symref_info.buf,
1153                              data->allow_filter ? " filter" : "",
1154                              git_user_agent_sanitized());
1155                 strbuf_release(&symref_info);
1156         } else {
1157                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1158         }
1159         capabilities = NULL;
1160         if (!peel_ref(refname, &peeled))
1161                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1162         return 0;
1163 }
1164
1165 static int find_symref(const char *refname, const struct object_id *oid,
1166                        int flag, void *cb_data)
1167 {
1168         const char *symref_target;
1169         struct string_list_item *item;
1170
1171         if ((flag & REF_ISSYMREF) == 0)
1172                 return 0;
1173         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1174         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1175                 die("'%s' is a symref but it is not?", refname);
1176         item = string_list_append(cb_data, strip_namespace(refname));
1177         item->util = xstrdup(strip_namespace(symref_target));
1178         return 0;
1179 }
1180
1181 static int upload_pack_config(const char *var, const char *value, void *cb_data)
1182 {
1183         struct upload_pack_data *data = cb_data;
1184
1185         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1186                 if (git_config_bool(var, value))
1187                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1188                 else
1189                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1190         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1191                 if (git_config_bool(var, value))
1192                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1193                 else
1194                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1195         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1196                 if (git_config_bool(var, value))
1197                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1198                 else
1199                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1200         } else if (!strcmp("uploadpack.keepalive", var)) {
1201                 data->keepalive = git_config_int(var, value);
1202                 if (!data->keepalive)
1203                         data->keepalive = -1;
1204         } else if (!strcmp("uploadpack.allowfilter", var)) {
1205                 data->allow_filter = git_config_bool(var, value);
1206         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1207                 data->allow_ref_in_want = git_config_bool(var, value);
1208         } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1209                 data->allow_sideband_all = git_config_bool(var, value);
1210         } else if (!strcmp("core.precomposeunicode", var)) {
1211                 precomposed_unicode = git_config_bool(var, value);
1212         }
1213
1214         if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
1215         current_config_scope() != CONFIG_SCOPE_WORKTREE) {
1216                 if (!strcmp("uploadpack.packobjectshook", var))
1217                         return git_config_string(&data->pack_objects_hook, var, value);
1218         }
1219
1220         return parse_hide_refs_config(var, value, "uploadpack");
1221 }
1222
1223 void upload_pack(struct upload_pack_options *options)
1224 {
1225         struct packet_reader reader;
1226         struct upload_pack_data data;
1227
1228         upload_pack_data_init(&data);
1229
1230         git_config(upload_pack_config, &data);
1231
1232         data.stateless_rpc = options->stateless_rpc;
1233         data.daemon_mode = options->daemon_mode;
1234         data.timeout = options->timeout;
1235
1236         head_ref_namespaced(find_symref, &data.symref);
1237
1238         if (options->advertise_refs || !data.stateless_rpc) {
1239                 reset_timeout(data.timeout);
1240                 head_ref_namespaced(send_ref, &data);
1241                 for_each_namespaced_ref(send_ref, &data);
1242                 advertise_shallow_grafts(1);
1243                 packet_flush(1);
1244         } else {
1245                 head_ref_namespaced(check_ref, NULL);
1246                 for_each_namespaced_ref(check_ref, NULL);
1247         }
1248
1249         if (!options->advertise_refs) {
1250                 packet_reader_init(&reader, 0, NULL, 0,
1251                                    PACKET_READ_CHOMP_NEWLINE |
1252                                    PACKET_READ_DIE_ON_ERR_PACKET);
1253
1254                 receive_needs(&data, &reader);
1255                 if (data.want_obj.nr) {
1256                         get_common_commits(&data, &reader);
1257                         create_pack_file(&data, 0);
1258                 }
1259         }
1260
1261         upload_pack_data_clear(&data);
1262 }
1263
1264 static int parse_want(struct packet_writer *writer, const char *line,
1265                       struct object_array *want_obj)
1266 {
1267         const char *arg;
1268         if (skip_prefix(line, "want ", &arg)) {
1269                 struct object_id oid;
1270                 struct object *o;
1271
1272                 if (get_oid_hex(arg, &oid))
1273                         die("git upload-pack: protocol error, "
1274                             "expected to get oid, not '%s'", line);
1275
1276                 o = parse_object(the_repository, &oid);
1277                 if (!o) {
1278                         packet_writer_error(writer,
1279                                             "upload-pack: not our ref %s",
1280                                             oid_to_hex(&oid));
1281                         die("git upload-pack: not our ref %s",
1282                             oid_to_hex(&oid));
1283                 }
1284
1285                 if (!(o->flags & WANTED)) {
1286                         o->flags |= WANTED;
1287                         add_object_array(o, NULL, want_obj);
1288                 }
1289
1290                 return 1;
1291         }
1292
1293         return 0;
1294 }
1295
1296 static int parse_want_ref(struct packet_writer *writer, const char *line,
1297                           struct string_list *wanted_refs,
1298                           struct object_array *want_obj)
1299 {
1300         const char *arg;
1301         if (skip_prefix(line, "want-ref ", &arg)) {
1302                 struct object_id oid;
1303                 struct string_list_item *item;
1304                 struct object *o;
1305
1306                 if (read_ref(arg, &oid)) {
1307                         packet_writer_error(writer, "unknown ref %s", arg);
1308                         die("unknown ref %s", arg);
1309                 }
1310
1311                 item = string_list_append(wanted_refs, arg);
1312                 item->util = oiddup(&oid);
1313
1314                 o = parse_object_or_die(&oid, arg);
1315                 if (!(o->flags & WANTED)) {
1316                         o->flags |= WANTED;
1317                         add_object_array(o, NULL, want_obj);
1318                 }
1319
1320                 return 1;
1321         }
1322
1323         return 0;
1324 }
1325
1326 static int parse_have(const char *line, struct oid_array *haves)
1327 {
1328         const char *arg;
1329         if (skip_prefix(line, "have ", &arg)) {
1330                 struct object_id oid;
1331
1332                 if (get_oid_hex(arg, &oid))
1333                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1334                 oid_array_append(haves, &oid);
1335                 return 1;
1336         }
1337
1338         return 0;
1339 }
1340
1341 static void process_args(struct packet_reader *request,
1342                          struct upload_pack_data *data)
1343 {
1344         while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1345                 const char *arg = request->line;
1346                 const char *p;
1347
1348                 /* process want */
1349                 if (parse_want(&data->writer, arg, &data->want_obj))
1350                         continue;
1351                 if (data->allow_ref_in_want &&
1352                     parse_want_ref(&data->writer, arg, &data->wanted_refs,
1353                                    &data->want_obj))
1354                         continue;
1355                 /* process have line */
1356                 if (parse_have(arg, &data->haves))
1357                         continue;
1358
1359                 /* process args like thin-pack */
1360                 if (!strcmp(arg, "thin-pack")) {
1361                         data->use_thin_pack = 1;
1362                         continue;
1363                 }
1364                 if (!strcmp(arg, "ofs-delta")) {
1365                         data->use_ofs_delta = 1;
1366                         continue;
1367                 }
1368                 if (!strcmp(arg, "no-progress")) {
1369                         data->no_progress = 1;
1370                         continue;
1371                 }
1372                 if (!strcmp(arg, "include-tag")) {
1373                         data->use_include_tag = 1;
1374                         continue;
1375                 }
1376                 if (!strcmp(arg, "done")) {
1377                         data->done = 1;
1378                         continue;
1379                 }
1380
1381                 /* Shallow related arguments */
1382                 if (process_shallow(arg, &data->shallows))
1383                         continue;
1384                 if (process_deepen(arg, &data->depth))
1385                         continue;
1386                 if (process_deepen_since(arg, &data->deepen_since,
1387                                          &data->deepen_rev_list))
1388                         continue;
1389                 if (process_deepen_not(arg, &data->deepen_not,
1390                                        &data->deepen_rev_list))
1391                         continue;
1392                 if (!strcmp(arg, "deepen-relative")) {
1393                         data->deepen_relative = 1;
1394                         continue;
1395                 }
1396
1397                 if (data->allow_filter && skip_prefix(arg, "filter ", &p)) {
1398                         list_objects_filter_die_if_populated(&data->filter_options);
1399                         parse_list_objects_filter(&data->filter_options, p);
1400                         continue;
1401                 }
1402
1403                 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1404                      data->allow_sideband_all) &&
1405                     !strcmp(arg, "sideband-all")) {
1406                         data->writer.use_sideband = 1;
1407                         continue;
1408                 }
1409
1410                 if (skip_prefix(arg, "packfile-uris ", &p)) {
1411                         string_list_split(&data->uri_protocols, p, ',', -1);
1412                         continue;
1413                 }
1414
1415                 /* ignore unknown lines maybe? */
1416                 die("unexpected line: '%s'", arg);
1417         }
1418
1419         if (data->uri_protocols.nr && !data->writer.use_sideband)
1420                 string_list_clear(&data->uri_protocols, 0);
1421
1422         if (request->status != PACKET_READ_FLUSH)
1423                 die(_("expected flush after fetch arguments"));
1424 }
1425
1426 static int process_haves(struct oid_array *haves, struct oid_array *common,
1427                          struct object_array *have_obj)
1428 {
1429         int i;
1430
1431         /* Process haves */
1432         for (i = 0; i < haves->nr; i++) {
1433                 const struct object_id *oid = &haves->oid[i];
1434                 struct object *o;
1435                 int we_knew_they_have = 0;
1436
1437                 if (!has_object_file(oid))
1438                         continue;
1439
1440                 oid_array_append(common, oid);
1441
1442                 o = parse_object(the_repository, oid);
1443                 if (!o)
1444                         die("oops (%s)", oid_to_hex(oid));
1445                 if (o->type == OBJ_COMMIT) {
1446                         struct commit_list *parents;
1447                         struct commit *commit = (struct commit *)o;
1448                         if (o->flags & THEY_HAVE)
1449                                 we_knew_they_have = 1;
1450                         else
1451                                 o->flags |= THEY_HAVE;
1452                         if (!oldest_have || (commit->date < oldest_have))
1453                                 oldest_have = commit->date;
1454                         for (parents = commit->parents;
1455                              parents;
1456                              parents = parents->next)
1457                                 parents->item->object.flags |= THEY_HAVE;
1458                 }
1459                 if (!we_knew_they_have)
1460                         add_object_array(o, NULL, have_obj);
1461         }
1462
1463         return 0;
1464 }
1465
1466 static int send_acks(struct packet_writer *writer, struct oid_array *acks,
1467                      const struct object_array *have_obj,
1468                      struct object_array *want_obj)
1469 {
1470         int i;
1471
1472         packet_writer_write(writer, "acknowledgments\n");
1473
1474         /* Send Acks */
1475         if (!acks->nr)
1476                 packet_writer_write(writer, "NAK\n");
1477
1478         for (i = 0; i < acks->nr; i++) {
1479                 packet_writer_write(writer, "ACK %s\n",
1480                                     oid_to_hex(&acks->oid[i]));
1481         }
1482
1483         if (ok_to_give_up(have_obj, want_obj)) {
1484                 /* Send Ready */
1485                 packet_writer_write(writer, "ready\n");
1486                 return 1;
1487         }
1488
1489         return 0;
1490 }
1491
1492 static int process_haves_and_send_acks(struct upload_pack_data *data)
1493 {
1494         struct oid_array common = OID_ARRAY_INIT;
1495         int ret = 0;
1496
1497         process_haves(&data->haves, &common, &data->have_obj);
1498         if (data->done) {
1499                 ret = 1;
1500         } else if (send_acks(&data->writer, &common,
1501                              &data->have_obj, &data->want_obj)) {
1502                 packet_writer_delim(&data->writer);
1503                 ret = 1;
1504         } else {
1505                 /* Add Flush */
1506                 packet_writer_flush(&data->writer);
1507                 ret = 0;
1508         }
1509
1510         oid_array_clear(&data->haves);
1511         oid_array_clear(&common);
1512         return ret;
1513 }
1514
1515 static void send_wanted_ref_info(struct upload_pack_data *data)
1516 {
1517         const struct string_list_item *item;
1518
1519         if (!data->wanted_refs.nr)
1520                 return;
1521
1522         packet_writer_write(&data->writer, "wanted-refs\n");
1523
1524         for_each_string_list_item(item, &data->wanted_refs) {
1525                 packet_writer_write(&data->writer, "%s %s\n",
1526                                     oid_to_hex(item->util),
1527                                     item->string);
1528         }
1529
1530         packet_writer_delim(&data->writer);
1531 }
1532
1533 static void send_shallow_info(struct upload_pack_data *data)
1534 {
1535         /* No shallow info needs to be sent */
1536         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1537             !is_repository_shallow(the_repository))
1538                 return;
1539
1540         packet_writer_write(&data->writer, "shallow-info\n");
1541
1542         if (!send_shallow_list(&data->writer, data->depth,
1543                                data->deepen_rev_list,
1544                                data->deepen_since, &data->deepen_not,
1545                                data->deepen_relative,
1546                                &data->shallows, &data->want_obj) &&
1547             is_repository_shallow(the_repository))
1548                 deepen(&data->writer, INFINITE_DEPTH, data->deepen_relative,
1549                        &data->shallows, &data->want_obj);
1550
1551         packet_delim(1);
1552 }
1553
1554 enum fetch_state {
1555         FETCH_PROCESS_ARGS = 0,
1556         FETCH_SEND_ACKS,
1557         FETCH_SEND_PACK,
1558         FETCH_DONE,
1559 };
1560
1561 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1562                    struct packet_reader *request)
1563 {
1564         enum fetch_state state = FETCH_PROCESS_ARGS;
1565         struct upload_pack_data data;
1566
1567         clear_object_flags(ALL_FLAGS);
1568
1569         upload_pack_data_init(&data);
1570         data.use_sideband = LARGE_PACKET_MAX;
1571
1572         git_config(upload_pack_config, &data);
1573
1574         while (state != FETCH_DONE) {
1575                 switch (state) {
1576                 case FETCH_PROCESS_ARGS:
1577                         process_args(request, &data);
1578
1579                         if (!data.want_obj.nr) {
1580                                 /*
1581                                  * Request didn't contain any 'want' lines,
1582                                  * guess they didn't want anything.
1583                                  */
1584                                 state = FETCH_DONE;
1585                         } else if (data.haves.nr) {
1586                                 /*
1587                                  * Request had 'have' lines, so lets ACK them.
1588                                  */
1589                                 state = FETCH_SEND_ACKS;
1590                         } else {
1591                                 /*
1592                                  * Request had 'want's but no 'have's so we can
1593                                  * immedietly go to construct and send a pack.
1594                                  */
1595                                 state = FETCH_SEND_PACK;
1596                         }
1597                         break;
1598                 case FETCH_SEND_ACKS:
1599                         if (process_haves_and_send_acks(&data))
1600                                 state = FETCH_SEND_PACK;
1601                         else
1602                                 state = FETCH_DONE;
1603                         break;
1604                 case FETCH_SEND_PACK:
1605                         send_wanted_ref_info(&data);
1606                         send_shallow_info(&data);
1607
1608                         if (data.uri_protocols.nr) {
1609                                 create_pack_file(&data, &data.uri_protocols);
1610                         } else {
1611                                 packet_writer_write(&data.writer, "packfile\n");
1612                                 create_pack_file(&data, NULL);
1613                         }
1614                         state = FETCH_DONE;
1615                         break;
1616                 case FETCH_DONE:
1617                         continue;
1618                 }
1619         }
1620
1621         upload_pack_data_clear(&data);
1622         return 0;
1623 }
1624
1625 int upload_pack_advertise(struct repository *r,
1626                           struct strbuf *value)
1627 {
1628         if (value) {
1629                 int allow_filter_value;
1630                 int allow_ref_in_want;
1631                 int allow_sideband_all_value;
1632                 char *str = NULL;
1633
1634                 strbuf_addstr(value, "shallow");
1635
1636                 if (!repo_config_get_bool(the_repository,
1637                                          "uploadpack.allowfilter",
1638                                          &allow_filter_value) &&
1639                     allow_filter_value)
1640                         strbuf_addstr(value, " filter");
1641
1642                 if (!repo_config_get_bool(the_repository,
1643                                          "uploadpack.allowrefinwant",
1644                                          &allow_ref_in_want) &&
1645                     allow_ref_in_want)
1646                         strbuf_addstr(value, " ref-in-want");
1647
1648                 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1649                     (!repo_config_get_bool(the_repository,
1650                                            "uploadpack.allowsidebandall",
1651                                            &allow_sideband_all_value) &&
1652                      allow_sideband_all_value))
1653                         strbuf_addstr(value, " sideband-all");
1654
1655                 if (!repo_config_get_string(the_repository,
1656                                             "uploadpack.blobpackfileuri",
1657                                             &str) &&
1658                     str) {
1659                         strbuf_addstr(value, " packfile-uris");
1660                         free(str);
1661                 }
1662         }
1663
1664         return 1;
1665 }