upload-pack.con commit Merge branch 'maint' of git://github.com/git-l10n/git-po into maint (c90d3db)
   1#include "cache.h"
   2#include "refs.h"
   3#include "pkt-line.h"
   4#include "sideband.h"
   5#include "tag.h"
   6#include "object.h"
   7#include "commit.h"
   8#include "exec_cmd.h"
   9#include "diff.h"
  10#include "revision.h"
  11#include "list-objects.h"
  12#include "run-command.h"
  13#include "connect.h"
  14#include "sigchain.h"
  15#include "version.h"
  16#include "string-list.h"
  17
  18static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=<n>] <dir>";
  19
  20/* bits #0..7 in revision.h, #8..10 in commit.c */
  21#define THEY_HAVE       (1u << 11)
  22#define OUR_REF         (1u << 12)
  23#define WANTED          (1u << 13)
  24#define COMMON_KNOWN    (1u << 14)
  25#define REACHABLE       (1u << 15)
  26
  27#define SHALLOW         (1u << 16)
  28#define NOT_SHALLOW     (1u << 17)
  29#define CLIENT_SHALLOW  (1u << 18)
  30#define HIDDEN_REF      (1u << 19)
  31
  32static unsigned long oldest_have;
  33
  34static int multi_ack;
  35static int no_done;
  36static int use_thin_pack, use_ofs_delta, use_include_tag;
  37static int no_progress, daemon_mode;
  38static int allow_tip_sha1_in_want;
  39static int shallow_nr;
  40static struct object_array have_obj;
  41static struct object_array want_obj;
  42static struct object_array extra_edge_obj;
  43static unsigned int timeout;
  44static int keepalive = 5;
  45/* 0 for no sideband,
  46 * otherwise maximum packet size (up to 65520 bytes).
  47 */
  48static int use_sideband;
  49static int advertise_refs;
  50static int stateless_rpc;
  51
  52static void reset_timeout(void)
  53{
  54        alarm(timeout);
  55}
  56
  57static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  58{
  59        if (use_sideband)
  60                return send_sideband(1, fd, data, sz, use_sideband);
  61        if (fd == 3)
  62                /* emergency quit */
  63                fd = 2;
  64        if (fd == 2) {
  65                /* XXX: are we happy to lose stuff here? */
  66                xwrite(fd, data, sz);
  67                return sz;
  68        }
  69        write_or_die(fd, data, sz);
  70        return sz;
  71}
  72
  73static void create_pack_file(void)
  74{
  75        struct child_process pack_objects;
  76        char data[8193], progress[128];
  77        char abort_msg[] = "aborting due to possible repository "
  78                "corruption on the remote side.";
  79        int buffered = -1;
  80        ssize_t sz;
  81        const char *argv[12];
  82        int i, arg = 0;
  83        FILE *pipe_fd;
  84        char *shallow_file = NULL;
  85
  86        if (shallow_nr) {
  87                shallow_file = setup_temporary_shallow();
  88                argv[arg++] = "--shallow-file";
  89                argv[arg++] = shallow_file;
  90        }
  91        argv[arg++] = "pack-objects";
  92        argv[arg++] = "--revs";
  93        if (use_thin_pack)
  94                argv[arg++] = "--thin";
  95
  96        argv[arg++] = "--stdout";
  97        if (!no_progress)
  98                argv[arg++] = "--progress";
  99        if (use_ofs_delta)
 100                argv[arg++] = "--delta-base-offset";
 101        if (use_include_tag)
 102                argv[arg++] = "--include-tag";
 103        argv[arg++] = NULL;
 104
 105        memset(&pack_objects, 0, sizeof(pack_objects));
 106        pack_objects.in = -1;
 107        pack_objects.out = -1;
 108        pack_objects.err = -1;
 109        pack_objects.git_cmd = 1;
 110        pack_objects.argv = argv;
 111
 112        if (start_command(&pack_objects))
 113                die("git upload-pack: unable to fork git-pack-objects");
 114
 115        pipe_fd = xfdopen(pack_objects.in, "w");
 116
 117        for (i = 0; i < want_obj.nr; i++)
 118                fprintf(pipe_fd, "%s\n",
 119                        sha1_to_hex(want_obj.objects[i].item->sha1));
 120        fprintf(pipe_fd, "--not\n");
 121        for (i = 0; i < have_obj.nr; i++)
 122                fprintf(pipe_fd, "%s\n",
 123                        sha1_to_hex(have_obj.objects[i].item->sha1));
 124        for (i = 0; i < extra_edge_obj.nr; i++)
 125                fprintf(pipe_fd, "%s\n",
 126                        sha1_to_hex(extra_edge_obj.objects[i].item->sha1));
 127        fprintf(pipe_fd, "\n");
 128        fflush(pipe_fd);
 129        fclose(pipe_fd);
 130
 131        /* We read from pack_objects.err to capture stderr output for
 132         * progress bar, and pack_objects.out to capture the pack data.
 133         */
 134
 135        while (1) {
 136                struct pollfd pfd[2];
 137                int pe, pu, pollsize;
 138                int ret;
 139
 140                reset_timeout();
 141
 142                pollsize = 0;
 143                pe = pu = -1;
 144
 145                if (0 <= pack_objects.out) {
 146                        pfd[pollsize].fd = pack_objects.out;
 147                        pfd[pollsize].events = POLLIN;
 148                        pu = pollsize;
 149                        pollsize++;
 150                }
 151                if (0 <= pack_objects.err) {
 152                        pfd[pollsize].fd = pack_objects.err;
 153                        pfd[pollsize].events = POLLIN;
 154                        pe = pollsize;
 155                        pollsize++;
 156                }
 157
 158                if (!pollsize)
 159                        break;
 160
 161                ret = poll(pfd, pollsize, 1000 * keepalive);
 162                if (ret < 0) {
 163                        if (errno != EINTR) {
 164                                error("poll failed, resuming: %s",
 165                                      strerror(errno));
 166                                sleep(1);
 167                        }
 168                        continue;
 169                }
 170                if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 171                        /* Status ready; we ship that in the side-band
 172                         * or dump to the standard error.
 173                         */
 174                        sz = xread(pack_objects.err, progress,
 175                                  sizeof(progress));
 176                        if (0 < sz)
 177                                send_client_data(2, progress, sz);
 178                        else if (sz == 0) {
 179                                close(pack_objects.err);
 180                                pack_objects.err = -1;
 181                        }
 182                        else
 183                                goto fail;
 184                        /* give priority to status messages */
 185                        continue;
 186                }
 187                if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 188                        /* Data ready; we keep the last byte to ourselves
 189                         * in case we detect broken rev-list, so that we
 190                         * can leave the stream corrupted.  This is
 191                         * unfortunate -- unpack-objects would happily
 192                         * accept a valid packdata with trailing garbage,
 193                         * so appending garbage after we pass all the
 194                         * pack data is not good enough to signal
 195                         * breakage to downstream.
 196                         */
 197                        char *cp = data;
 198                        ssize_t outsz = 0;
 199                        if (0 <= buffered) {
 200                                *cp++ = buffered;
 201                                outsz++;
 202                        }
 203                        sz = xread(pack_objects.out, cp,
 204                                  sizeof(data) - outsz);
 205                        if (0 < sz)
 206                                ;
 207                        else if (sz == 0) {
 208                                close(pack_objects.out);
 209                                pack_objects.out = -1;
 210                        }
 211                        else
 212                                goto fail;
 213                        sz += outsz;
 214                        if (1 < sz) {
 215                                buffered = data[sz-1] & 0xFF;
 216                                sz--;
 217                        }
 218                        else
 219                                buffered = -1;
 220                        sz = send_client_data(1, data, sz);
 221                        if (sz < 0)
 222                                goto fail;
 223                }
 224
 225                /*
 226                 * We hit the keepalive timeout without saying anything; send
 227                 * an empty message on the data sideband just to let the other
 228                 * side know we're still working on it, but don't have any data
 229                 * yet.
 230                 *
 231                 * If we don't have a sideband channel, there's no room in the
 232                 * protocol to say anything, so those clients are just out of
 233                 * luck.
 234                 */
 235                if (!ret && use_sideband) {
 236                        static const char buf[] = "0005\1";
 237                        write_or_die(1, buf, 5);
 238                }
 239        }
 240
 241        if (finish_command(&pack_objects)) {
 242                error("git upload-pack: git-pack-objects died with error.");
 243                goto fail;
 244        }
 245        if (shallow_file) {
 246                if (*shallow_file)
 247                        unlink(shallow_file);
 248                free(shallow_file);
 249        }
 250
 251        /* flush the data */
 252        if (0 <= buffered) {
 253                data[0] = buffered;
 254                sz = send_client_data(1, data, 1);
 255                if (sz < 0)
 256                        goto fail;
 257                fprintf(stderr, "flushed.\n");
 258        }
 259        if (use_sideband)
 260                packet_flush(1);
 261        return;
 262
 263 fail:
 264        send_client_data(3, abort_msg, sizeof(abort_msg));
 265        die("git upload-pack: %s", abort_msg);
 266}
 267
 268static int got_sha1(char *hex, unsigned char *sha1)
 269{
 270        struct object *o;
 271        int we_knew_they_have = 0;
 272
 273        if (get_sha1_hex(hex, sha1))
 274                die("git upload-pack: expected SHA1 object, got '%s'", hex);
 275        if (!has_sha1_file(sha1))
 276                return -1;
 277
 278        o = parse_object(sha1);
 279        if (!o)
 280                die("oops (%s)", sha1_to_hex(sha1));
 281        if (o->type == OBJ_COMMIT) {
 282                struct commit_list *parents;
 283                struct commit *commit = (struct commit *)o;
 284                if (o->flags & THEY_HAVE)
 285                        we_knew_they_have = 1;
 286                else
 287                        o->flags |= THEY_HAVE;
 288                if (!oldest_have || (commit->date < oldest_have))
 289                        oldest_have = commit->date;
 290                for (parents = commit->parents;
 291                     parents;
 292                     parents = parents->next)
 293                        parents->item->object.flags |= THEY_HAVE;
 294        }
 295        if (!we_knew_they_have) {
 296                add_object_array(o, NULL, &have_obj);
 297                return 1;
 298        }
 299        return 0;
 300}
 301
 302static int reachable(struct commit *want)
 303{
 304        struct commit_list *work = NULL;
 305
 306        commit_list_insert_by_date(want, &work);
 307        while (work) {
 308                struct commit_list *list = work->next;
 309                struct commit *commit = work->item;
 310                free(work);
 311                work = list;
 312
 313                if (commit->object.flags & THEY_HAVE) {
 314                        want->object.flags |= COMMON_KNOWN;
 315                        break;
 316                }
 317                if (!commit->object.parsed)
 318                        parse_object(commit->object.sha1);
 319                if (commit->object.flags & REACHABLE)
 320                        continue;
 321                commit->object.flags |= REACHABLE;
 322                if (commit->date < oldest_have)
 323                        continue;
 324                for (list = commit->parents; list; list = list->next) {
 325                        struct commit *parent = list->item;
 326                        if (!(parent->object.flags & REACHABLE))
 327                                commit_list_insert_by_date(parent, &work);
 328                }
 329        }
 330        want->object.flags |= REACHABLE;
 331        clear_commit_marks(want, REACHABLE);
 332        free_commit_list(work);
 333        return (want->object.flags & COMMON_KNOWN);
 334}
 335
 336static int ok_to_give_up(void)
 337{
 338        int i;
 339
 340        if (!have_obj.nr)
 341                return 0;
 342
 343        for (i = 0; i < want_obj.nr; i++) {
 344                struct object *want = want_obj.objects[i].item;
 345
 346                if (want->flags & COMMON_KNOWN)
 347                        continue;
 348                want = deref_tag(want, "a want line", 0);
 349                if (!want || want->type != OBJ_COMMIT) {
 350                        /* no way to tell if this is reachable by
 351                         * looking at the ancestry chain alone, so
 352                         * leave a note to ourselves not to worry about
 353                         * this object anymore.
 354                         */
 355                        want_obj.objects[i].item->flags |= COMMON_KNOWN;
 356                        continue;
 357                }
 358                if (!reachable((struct commit *)want))
 359                        return 0;
 360        }
 361        return 1;
 362}
 363
 364static int get_common_commits(void)
 365{
 366        unsigned char sha1[20];
 367        char last_hex[41];
 368        int got_common = 0;
 369        int got_other = 0;
 370        int sent_ready = 0;
 371
 372        save_commit_buffer = 0;
 373
 374        for (;;) {
 375                char *line = packet_read_line(0, NULL);
 376                reset_timeout();
 377
 378                if (!line) {
 379                        if (multi_ack == 2 && got_common
 380                            && !got_other && ok_to_give_up()) {
 381                                sent_ready = 1;
 382                                packet_write(1, "ACK %s ready\n", last_hex);
 383                        }
 384                        if (have_obj.nr == 0 || multi_ack)
 385                                packet_write(1, "NAK\n");
 386
 387                        if (no_done && sent_ready) {
 388                                packet_write(1, "ACK %s\n", last_hex);
 389                                return 0;
 390                        }
 391                        if (stateless_rpc)
 392                                exit(0);
 393                        got_common = 0;
 394                        got_other = 0;
 395                        continue;
 396                }
 397                if (!prefixcmp(line, "have ")) {
 398                        switch (got_sha1(line+5, sha1)) {
 399                        case -1: /* they have what we do not */
 400                                got_other = 1;
 401                                if (multi_ack && ok_to_give_up()) {
 402                                        const char *hex = sha1_to_hex(sha1);
 403                                        if (multi_ack == 2) {
 404                                                sent_ready = 1;
 405                                                packet_write(1, "ACK %s ready\n", hex);
 406                                        } else
 407                                                packet_write(1, "ACK %s continue\n", hex);
 408                                }
 409                                break;
 410                        default:
 411                                got_common = 1;
 412                                memcpy(last_hex, sha1_to_hex(sha1), 41);
 413                                if (multi_ack == 2)
 414                                        packet_write(1, "ACK %s common\n", last_hex);
 415                                else if (multi_ack)
 416                                        packet_write(1, "ACK %s continue\n", last_hex);
 417                                else if (have_obj.nr == 1)
 418                                        packet_write(1, "ACK %s\n", last_hex);
 419                                break;
 420                        }
 421                        continue;
 422                }
 423                if (!strcmp(line, "done")) {
 424                        if (have_obj.nr > 0) {
 425                                if (multi_ack)
 426                                        packet_write(1, "ACK %s\n", last_hex);
 427                                return 0;
 428                        }
 429                        packet_write(1, "NAK\n");
 430                        return -1;
 431                }
 432                die("git upload-pack: expected SHA1 list, got '%s'", line);
 433        }
 434}
 435
 436static int is_our_ref(struct object *o)
 437{
 438        return o->flags &
 439                ((allow_tip_sha1_in_want ? HIDDEN_REF : 0) | OUR_REF);
 440}
 441
 442static void check_non_tip(void)
 443{
 444        static const char *argv[] = {
 445                "rev-list", "--stdin", NULL,
 446        };
 447        static struct child_process cmd;
 448        struct object *o;
 449        char namebuf[42]; /* ^ + SHA-1 + LF */
 450        int i;
 451
 452        /* In the normal in-process case non-tip request can never happen */
 453        if (!stateless_rpc)
 454                goto error;
 455
 456        cmd.argv = argv;
 457        cmd.git_cmd = 1;
 458        cmd.no_stderr = 1;
 459        cmd.in = -1;
 460        cmd.out = -1;
 461
 462        if (start_command(&cmd))
 463                goto error;
 464
 465        /*
 466         * If rev-list --stdin encounters an unknown commit, it
 467         * terminates, which will cause SIGPIPE in the write loop
 468         * below.
 469         */
 470        sigchain_push(SIGPIPE, SIG_IGN);
 471
 472        namebuf[0] = '^';
 473        namebuf[41] = '\n';
 474        for (i = get_max_object_index(); 0 < i; ) {
 475                o = get_indexed_object(--i);
 476                if (!o)
 477                        continue;
 478                if (!is_our_ref(o))
 479                        continue;
 480                memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
 481                if (write_in_full(cmd.in, namebuf, 42) < 0)
 482                        goto error;
 483        }
 484        namebuf[40] = '\n';
 485        for (i = 0; i < want_obj.nr; i++) {
 486                o = want_obj.objects[i].item;
 487                if (is_our_ref(o))
 488                        continue;
 489                memcpy(namebuf, sha1_to_hex(o->sha1), 40);
 490                if (write_in_full(cmd.in, namebuf, 41) < 0)
 491                        goto error;
 492        }
 493        close(cmd.in);
 494
 495        sigchain_pop(SIGPIPE);
 496
 497        /*
 498         * The commits out of the rev-list are not ancestors of
 499         * our ref.
 500         */
 501        i = read_in_full(cmd.out, namebuf, 1);
 502        if (i)
 503                goto error;
 504        close(cmd.out);
 505
 506        /*
 507         * rev-list may have died by encountering a bad commit
 508         * in the history, in which case we do want to bail out
 509         * even when it showed no commit.
 510         */
 511        if (finish_command(&cmd))
 512                goto error;
 513
 514        /* All the non-tip ones are ancestors of what we advertised */
 515        return;
 516
 517error:
 518        /* Pick one of them (we know there at least is one) */
 519        for (i = 0; i < want_obj.nr; i++) {
 520                o = want_obj.objects[i].item;
 521                if (!is_our_ref(o))
 522                        die("git upload-pack: not our ref %s",
 523                            sha1_to_hex(o->sha1));
 524        }
 525}
 526
 527static void receive_needs(void)
 528{
 529        struct object_array shallows = OBJECT_ARRAY_INIT;
 530        int depth = 0;
 531        int has_non_tip = 0;
 532
 533        shallow_nr = 0;
 534        for (;;) {
 535                struct object *o;
 536                const char *features;
 537                unsigned char sha1_buf[20];
 538                char *line = packet_read_line(0, NULL);
 539                reset_timeout();
 540                if (!line)
 541                        break;
 542
 543                if (!prefixcmp(line, "shallow ")) {
 544                        unsigned char sha1[20];
 545                        struct object *object;
 546                        if (get_sha1_hex(line + 8, sha1))
 547                                die("invalid shallow line: %s", line);
 548                        object = parse_object(sha1);
 549                        if (!object)
 550                                continue;
 551                        if (object->type != OBJ_COMMIT)
 552                                die("invalid shallow object %s", sha1_to_hex(sha1));
 553                        if (!(object->flags & CLIENT_SHALLOW)) {
 554                                object->flags |= CLIENT_SHALLOW;
 555                                add_object_array(object, NULL, &shallows);
 556                        }
 557                        continue;
 558                }
 559                if (!prefixcmp(line, "deepen ")) {
 560                        char *end;
 561                        depth = strtol(line + 7, &end, 0);
 562                        if (end == line + 7 || depth <= 0)
 563                                die("Invalid deepen: %s", line);
 564                        continue;
 565                }
 566                if (prefixcmp(line, "want ") ||
 567                    get_sha1_hex(line+5, sha1_buf))
 568                        die("git upload-pack: protocol error, "
 569                            "expected to get sha, not '%s'", line);
 570
 571                features = line + 45;
 572
 573                if (parse_feature_request(features, "multi_ack_detailed"))
 574                        multi_ack = 2;
 575                else if (parse_feature_request(features, "multi_ack"))
 576                        multi_ack = 1;
 577                if (parse_feature_request(features, "no-done"))
 578                        no_done = 1;
 579                if (parse_feature_request(features, "thin-pack"))
 580                        use_thin_pack = 1;
 581                if (parse_feature_request(features, "ofs-delta"))
 582                        use_ofs_delta = 1;
 583                if (parse_feature_request(features, "side-band-64k"))
 584                        use_sideband = LARGE_PACKET_MAX;
 585                else if (parse_feature_request(features, "side-band"))
 586                        use_sideband = DEFAULT_PACKET_MAX;
 587                if (parse_feature_request(features, "no-progress"))
 588                        no_progress = 1;
 589                if (parse_feature_request(features, "include-tag"))
 590                        use_include_tag = 1;
 591
 592                o = parse_object(sha1_buf);
 593                if (!o)
 594                        die("git upload-pack: not our ref %s",
 595                            sha1_to_hex(sha1_buf));
 596                if (!(o->flags & WANTED)) {
 597                        o->flags |= WANTED;
 598                        if (!is_our_ref(o))
 599                                has_non_tip = 1;
 600                        add_object_array(o, NULL, &want_obj);
 601                }
 602        }
 603
 604        /*
 605         * We have sent all our refs already, and the other end
 606         * should have chosen out of them. When we are operating
 607         * in the stateless RPC mode, however, their choice may
 608         * have been based on the set of older refs advertised
 609         * by another process that handled the initial request.
 610         */
 611        if (has_non_tip)
 612                check_non_tip();
 613
 614        if (!use_sideband && daemon_mode)
 615                no_progress = 1;
 616
 617        if (depth == 0 && shallows.nr == 0)
 618                return;
 619        if (depth > 0) {
 620                struct commit_list *result = NULL, *backup = NULL;
 621                int i;
 622                if (depth == INFINITE_DEPTH)
 623                        for (i = 0; i < shallows.nr; i++) {
 624                                struct object *object = shallows.objects[i].item;
 625                                object->flags |= NOT_SHALLOW;
 626                        }
 627                else
 628                        backup = result =
 629                                get_shallow_commits(&want_obj, depth,
 630                                                    SHALLOW, NOT_SHALLOW);
 631                while (result) {
 632                        struct object *object = &result->item->object;
 633                        if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 634                                packet_write(1, "shallow %s",
 635                                                sha1_to_hex(object->sha1));
 636                                register_shallow(object->sha1);
 637                                shallow_nr++;
 638                        }
 639                        result = result->next;
 640                }
 641                free_commit_list(backup);
 642                for (i = 0; i < shallows.nr; i++) {
 643                        struct object *object = shallows.objects[i].item;
 644                        if (object->flags & NOT_SHALLOW) {
 645                                struct commit_list *parents;
 646                                packet_write(1, "unshallow %s",
 647                                        sha1_to_hex(object->sha1));
 648                                object->flags &= ~CLIENT_SHALLOW;
 649                                /* make sure the real parents are parsed */
 650                                unregister_shallow(object->sha1);
 651                                object->parsed = 0;
 652                                if (parse_commit((struct commit *)object))
 653                                        die("invalid commit");
 654                                parents = ((struct commit *)object)->parents;
 655                                while (parents) {
 656                                        add_object_array(&parents->item->object,
 657                                                        NULL, &want_obj);
 658                                        parents = parents->next;
 659                                }
 660                                add_object_array(object, NULL, &extra_edge_obj);
 661                        }
 662                        /* make sure commit traversal conforms to client */
 663                        register_shallow(object->sha1);
 664                }
 665                packet_flush(1);
 666        } else
 667                if (shallows.nr > 0) {
 668                        int i;
 669                        for (i = 0; i < shallows.nr; i++)
 670                                register_shallow(shallows.objects[i].item->sha1);
 671                }
 672
 673        shallow_nr += shallows.nr;
 674        free(shallows.objects);
 675}
 676
 677/* return non-zero if the ref is hidden, otherwise 0 */
 678static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 679{
 680        struct object *o = lookup_unknown_object(sha1);
 681
 682        if (ref_is_hidden(refname)) {
 683                o->flags |= HIDDEN_REF;
 684                return 1;
 685        }
 686        if (!o)
 687                die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 688        o->flags |= OUR_REF;
 689        return 0;
 690}
 691
 692static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 693{
 694        struct string_list_item *item;
 695
 696        if (!symref->nr)
 697                return;
 698        for_each_string_list_item(item, symref)
 699                strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 700}
 701
 702static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 703{
 704        static const char *capabilities = "multi_ack thin-pack side-band"
 705                " side-band-64k ofs-delta shallow no-progress"
 706                " include-tag multi_ack_detailed";
 707        const char *refname_nons = strip_namespace(refname);
 708        unsigned char peeled[20];
 709
 710        if (mark_our_ref(refname, sha1, flag, NULL))
 711                return 0;
 712
 713        if (capabilities) {
 714                struct strbuf symref_info = STRBUF_INIT;
 715
 716                format_symref_info(&symref_info, cb_data);
 717                packet_write(1, "%s %s%c%s%s%s%s agent=%s\n",
 718                             sha1_to_hex(sha1), refname_nons,
 719                             0, capabilities,
 720                             allow_tip_sha1_in_want ? " allow-tip-sha1-in-want" : "",
 721                             stateless_rpc ? " no-done" : "",
 722                             symref_info.buf,
 723                             git_user_agent_sanitized());
 724                strbuf_release(&symref_info);
 725        } else {
 726                packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
 727        }
 728        capabilities = NULL;
 729        if (!peel_ref(refname, peeled))
 730                packet_write(1, "%s %s^{}\n", sha1_to_hex(peeled), refname_nons);
 731        return 0;
 732}
 733
 734static int find_symref(const char *refname, const unsigned char *sha1, int flag,
 735                       void *cb_data)
 736{
 737        const char *symref_target;
 738        struct string_list_item *item;
 739        unsigned char unused[20];
 740
 741        if ((flag & REF_ISSYMREF) == 0)
 742                return 0;
 743        symref_target = resolve_ref_unsafe(refname, unused, 0, &flag);
 744        if (!symref_target || (flag & REF_ISSYMREF) == 0)
 745                die("'%s' is a symref but it is not?", refname);
 746        item = string_list_append(cb_data, refname);
 747        item->util = xstrdup(symref_target);
 748        return 0;
 749}
 750
 751static void upload_pack(void)
 752{
 753        struct string_list symref = STRING_LIST_INIT_DUP;
 754
 755        head_ref_namespaced(find_symref, &symref);
 756
 757        if (advertise_refs || !stateless_rpc) {
 758                reset_timeout();
 759                head_ref_namespaced(send_ref, &symref);
 760                for_each_namespaced_ref(send_ref, &symref);
 761                packet_flush(1);
 762        } else {
 763                head_ref_namespaced(mark_our_ref, NULL);
 764                for_each_namespaced_ref(mark_our_ref, NULL);
 765        }
 766        string_list_clear(&symref, 1);
 767        if (advertise_refs)
 768                return;
 769
 770        receive_needs();
 771        if (want_obj.nr) {
 772                get_common_commits();
 773                create_pack_file();
 774        }
 775}
 776
 777static int upload_pack_config(const char *var, const char *value, void *unused)
 778{
 779        if (!strcmp("uploadpack.allowtipsha1inwant", var))
 780                allow_tip_sha1_in_want = git_config_bool(var, value);
 781        else if (!strcmp("uploadpack.keepalive", var)) {
 782                keepalive = git_config_int(var, value);
 783                if (!keepalive)
 784                        keepalive = -1;
 785        }
 786        return parse_hide_refs_config(var, value, "uploadpack");
 787}
 788
 789int main(int argc, char **argv)
 790{
 791        char *dir;
 792        int i;
 793        int strict = 0;
 794
 795        git_setup_gettext();
 796
 797        packet_trace_identity("upload-pack");
 798        git_extract_argv0_path(argv[0]);
 799        read_replace_refs = 0;
 800
 801        for (i = 1; i < argc; i++) {
 802                char *arg = argv[i];
 803
 804                if (arg[0] != '-')
 805                        break;
 806                if (!strcmp(arg, "--advertise-refs")) {
 807                        advertise_refs = 1;
 808                        continue;
 809                }
 810                if (!strcmp(arg, "--stateless-rpc")) {
 811                        stateless_rpc = 1;
 812                        continue;
 813                }
 814                if (!strcmp(arg, "--strict")) {
 815                        strict = 1;
 816                        continue;
 817                }
 818                if (!prefixcmp(arg, "--timeout=")) {
 819                        timeout = atoi(arg+10);
 820                        daemon_mode = 1;
 821                        continue;
 822                }
 823                if (!strcmp(arg, "--")) {
 824                        i++;
 825                        break;
 826                }
 827        }
 828
 829        if (i != argc-1)
 830                usage(upload_pack_usage);
 831
 832        setup_path();
 833
 834        dir = argv[i];
 835
 836        if (!enter_repo(dir, strict))
 837                die("'%s' does not appear to be a git repository", dir);
 838        if (is_repository_shallow())
 839                die("attempt to fetch/clone from a shallow repository");
 840        git_config(upload_pack_config, NULL);
 841        upload_pack();
 842        return 0;
 843}