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