fa7ce092e77035974596b0879002bb093b300679
   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/* Remember to update object flag allocation in object.h */
  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;
  38/* Allow specifying sha1 if it is a ref tip. */
  39#define ALLOW_TIP_SHA1  01
  40/* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  41#define ALLOW_REACHABLE_SHA1    02
  42static unsigned int allow_unadvertised_object_request;
  43static int shallow_nr;
  44static struct object_array have_obj;
  45static struct object_array want_obj;
  46static struct object_array extra_edge_obj;
  47static unsigned int timeout;
  48static int keepalive = 5;
  49/* 0 for no sideband,
  50 * otherwise maximum packet size (up to 65520 bytes).
  51 */
  52static int use_sideband;
  53static int advertise_refs;
  54static int stateless_rpc;
  55
  56static void reset_timeout(void)
  57{
  58        alarm(timeout);
  59}
  60
  61static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  62{
  63        if (use_sideband)
  64                return send_sideband(1, fd, data, sz, use_sideband);
  65        if (fd == 3)
  66                /* emergency quit */
  67                fd = 2;
  68        if (fd == 2) {
  69                /* XXX: are we happy to lose stuff here? */
  70                xwrite(fd, data, sz);
  71                return sz;
  72        }
  73        write_or_die(fd, data, sz);
  74        return sz;
  75}
  76
  77static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  78{
  79        FILE *fp = cb_data;
  80        if (graft->nr_parent == -1)
  81                fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
  82        return 0;
  83}
  84
  85static void create_pack_file(void)
  86{
  87        struct child_process pack_objects = CHILD_PROCESS_INIT;
  88        char data[8193], progress[128];
  89        char abort_msg[] = "aborting due to possible repository "
  90                "corruption on the remote side.";
  91        int buffered = -1;
  92        ssize_t sz;
  93        const char *argv[13];
  94        int i, arg = 0;
  95        FILE *pipe_fd;
  96
  97        if (shallow_nr) {
  98                argv[arg++] = "--shallow-file";
  99                argv[arg++] = "";
 100        }
 101        argv[arg++] = "pack-objects";
 102        argv[arg++] = "--revs";
 103        if (use_thin_pack)
 104                argv[arg++] = "--thin";
 105
 106        argv[arg++] = "--stdout";
 107        if (shallow_nr)
 108                argv[arg++] = "--shallow";
 109        if (!no_progress)
 110                argv[arg++] = "--progress";
 111        if (use_ofs_delta)
 112                argv[arg++] = "--delta-base-offset";
 113        if (use_include_tag)
 114                argv[arg++] = "--include-tag";
 115        argv[arg++] = NULL;
 116
 117        pack_objects.in = -1;
 118        pack_objects.out = -1;
 119        pack_objects.err = -1;
 120        pack_objects.git_cmd = 1;
 121        pack_objects.argv = argv;
 122
 123        if (start_command(&pack_objects))
 124                die("git upload-pack: unable to fork git-pack-objects");
 125
 126        pipe_fd = xfdopen(pack_objects.in, "w");
 127
 128        if (shallow_nr)
 129                for_each_commit_graft(write_one_shallow, pipe_fd);
 130
 131        for (i = 0; i < want_obj.nr; i++)
 132                fprintf(pipe_fd, "%s\n",
 133                        oid_to_hex(&want_obj.objects[i].item->oid));
 134        fprintf(pipe_fd, "--not\n");
 135        for (i = 0; i < have_obj.nr; i++)
 136                fprintf(pipe_fd, "%s\n",
 137                        oid_to_hex(&have_obj.objects[i].item->oid));
 138        for (i = 0; i < extra_edge_obj.nr; i++)
 139                fprintf(pipe_fd, "%s\n",
 140                        oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 141        fprintf(pipe_fd, "\n");
 142        fflush(pipe_fd);
 143        fclose(pipe_fd);
 144
 145        /* We read from pack_objects.err to capture stderr output for
 146         * progress bar, and pack_objects.out to capture the pack data.
 147         */
 148
 149        while (1) {
 150                struct pollfd pfd[2];
 151                int pe, pu, pollsize;
 152                int ret;
 153
 154                reset_timeout();
 155
 156                pollsize = 0;
 157                pe = pu = -1;
 158
 159                if (0 <= pack_objects.out) {
 160                        pfd[pollsize].fd = pack_objects.out;
 161                        pfd[pollsize].events = POLLIN;
 162                        pu = pollsize;
 163                        pollsize++;
 164                }
 165                if (0 <= pack_objects.err) {
 166                        pfd[pollsize].fd = pack_objects.err;
 167                        pfd[pollsize].events = POLLIN;
 168                        pe = pollsize;
 169                        pollsize++;
 170                }
 171
 172                if (!pollsize)
 173                        break;
 174
 175                ret = poll(pfd, pollsize,
 176                        keepalive < 0 ? -1 : 1000 * keepalive);
 177
 178                if (ret < 0) {
 179                        if (errno != EINTR) {
 180                                error("poll failed, resuming: %s",
 181                                      strerror(errno));
 182                                sleep(1);
 183                        }
 184                        continue;
 185                }
 186                if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 187                        /* Status ready; we ship that in the side-band
 188                         * or dump to the standard error.
 189                         */
 190                        sz = xread(pack_objects.err, progress,
 191                                  sizeof(progress));
 192                        if (0 < sz)
 193                                send_client_data(2, progress, sz);
 194                        else if (sz == 0) {
 195                                close(pack_objects.err);
 196                                pack_objects.err = -1;
 197                        }
 198                        else
 199                                goto fail;
 200                        /* give priority to status messages */
 201                        continue;
 202                }
 203                if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 204                        /* Data ready; we keep the last byte to ourselves
 205                         * in case we detect broken rev-list, so that we
 206                         * can leave the stream corrupted.  This is
 207                         * unfortunate -- unpack-objects would happily
 208                         * accept a valid packdata with trailing garbage,
 209                         * so appending garbage after we pass all the
 210                         * pack data is not good enough to signal
 211                         * breakage to downstream.
 212                         */
 213                        char *cp = data;
 214                        ssize_t outsz = 0;
 215                        if (0 <= buffered) {
 216                                *cp++ = buffered;
 217                                outsz++;
 218                        }
 219                        sz = xread(pack_objects.out, cp,
 220                                  sizeof(data) - outsz);
 221                        if (0 < sz)
 222                                ;
 223                        else if (sz == 0) {
 224                                close(pack_objects.out);
 225                                pack_objects.out = -1;
 226                        }
 227                        else
 228                                goto fail;
 229                        sz += outsz;
 230                        if (1 < sz) {
 231                                buffered = data[sz-1] & 0xFF;
 232                                sz--;
 233                        }
 234                        else
 235                                buffered = -1;
 236                        sz = send_client_data(1, data, sz);
 237                        if (sz < 0)
 238                                goto fail;
 239                }
 240
 241                /*
 242                 * We hit the keepalive timeout without saying anything; send
 243                 * an empty message on the data sideband just to let the other
 244                 * side know we're still working on it, but don't have any data
 245                 * yet.
 246                 *
 247                 * If we don't have a sideband channel, there's no room in the
 248                 * protocol to say anything, so those clients are just out of
 249                 * luck.
 250                 */
 251                if (!ret && use_sideband) {
 252                        static const char buf[] = "0005\1";
 253                        write_or_die(1, buf, 5);
 254                }
 255        }
 256
 257        if (finish_command(&pack_objects)) {
 258                error("git upload-pack: git-pack-objects died with error.");
 259                goto fail;
 260        }
 261
 262        /* flush the data */
 263        if (0 <= buffered) {
 264                data[0] = buffered;
 265                sz = send_client_data(1, data, 1);
 266                if (sz < 0)
 267                        goto fail;
 268                fprintf(stderr, "flushed.\n");
 269        }
 270        if (use_sideband)
 271                packet_flush(1);
 272        return;
 273
 274 fail:
 275        send_client_data(3, abort_msg, sizeof(abort_msg));
 276        die("git upload-pack: %s", abort_msg);
 277}
 278
 279static int got_sha1(const char *hex, unsigned char *sha1)
 280{
 281        struct object *o;
 282        int we_knew_they_have = 0;
 283
 284        if (get_sha1_hex(hex, sha1))
 285                die("git upload-pack: expected SHA1 object, got '%s'", hex);
 286        if (!has_sha1_file(sha1))
 287                return -1;
 288
 289        o = parse_object(sha1);
 290        if (!o)
 291                die("oops (%s)", sha1_to_hex(sha1));
 292        if (o->type == OBJ_COMMIT) {
 293                struct commit_list *parents;
 294                struct commit *commit = (struct commit *)o;
 295                if (o->flags & THEY_HAVE)
 296                        we_knew_they_have = 1;
 297                else
 298                        o->flags |= THEY_HAVE;
 299                if (!oldest_have || (commit->date < oldest_have))
 300                        oldest_have = commit->date;
 301                for (parents = commit->parents;
 302                     parents;
 303                     parents = parents->next)
 304                        parents->item->object.flags |= THEY_HAVE;
 305        }
 306        if (!we_knew_they_have) {
 307                add_object_array(o, NULL, &have_obj);
 308                return 1;
 309        }
 310        return 0;
 311}
 312
 313static int reachable(struct commit *want)
 314{
 315        struct commit_list *work = NULL;
 316
 317        commit_list_insert_by_date(want, &work);
 318        while (work) {
 319                struct commit_list *list;
 320                struct commit *commit = pop_commit(&work);
 321
 322                if (commit->object.flags & THEY_HAVE) {
 323                        want->object.flags |= COMMON_KNOWN;
 324                        break;
 325                }
 326                if (!commit->object.parsed)
 327                        parse_object(commit->object.oid.hash);
 328                if (commit->object.flags & REACHABLE)
 329                        continue;
 330                commit->object.flags |= REACHABLE;
 331                if (commit->date < oldest_have)
 332                        continue;
 333                for (list = commit->parents; list; list = list->next) {
 334                        struct commit *parent = list->item;
 335                        if (!(parent->object.flags & REACHABLE))
 336                                commit_list_insert_by_date(parent, &work);
 337                }
 338        }
 339        want->object.flags |= REACHABLE;
 340        clear_commit_marks(want, REACHABLE);
 341        free_commit_list(work);
 342        return (want->object.flags & COMMON_KNOWN);
 343}
 344
 345static int ok_to_give_up(void)
 346{
 347        int i;
 348
 349        if (!have_obj.nr)
 350                return 0;
 351
 352        for (i = 0; i < want_obj.nr; i++) {
 353                struct object *want = want_obj.objects[i].item;
 354
 355                if (want->flags & COMMON_KNOWN)
 356                        continue;
 357                want = deref_tag(want, "a want line", 0);
 358                if (!want || want->type != OBJ_COMMIT) {
 359                        /* no way to tell if this is reachable by
 360                         * looking at the ancestry chain alone, so
 361                         * leave a note to ourselves not to worry about
 362                         * this object anymore.
 363                         */
 364                        want_obj.objects[i].item->flags |= COMMON_KNOWN;
 365                        continue;
 366                }
 367                if (!reachable((struct commit *)want))
 368                        return 0;
 369        }
 370        return 1;
 371}
 372
 373static int get_common_commits(void)
 374{
 375        unsigned char sha1[20];
 376        char last_hex[41];
 377        int got_common = 0;
 378        int got_other = 0;
 379        int sent_ready = 0;
 380
 381        save_commit_buffer = 0;
 382
 383        for (;;) {
 384                char *line = packet_read_line(0, NULL);
 385                const char *arg;
 386
 387                reset_timeout();
 388
 389                if (!line) {
 390                        if (multi_ack == 2 && got_common
 391                            && !got_other && ok_to_give_up()) {
 392                                sent_ready = 1;
 393                                packet_write(1, "ACK %s ready\n", last_hex);
 394                        }
 395                        if (have_obj.nr == 0 || multi_ack)
 396                                packet_write(1, "NAK\n");
 397
 398                        if (no_done && sent_ready) {
 399                                packet_write(1, "ACK %s\n", last_hex);
 400                                return 0;
 401                        }
 402                        if (stateless_rpc)
 403                                exit(0);
 404                        got_common = 0;
 405                        got_other = 0;
 406                        continue;
 407                }
 408                if (skip_prefix(line, "have ", &arg)) {
 409                        switch (got_sha1(arg, sha1)) {
 410                        case -1: /* they have what we do not */
 411                                got_other = 1;
 412                                if (multi_ack && ok_to_give_up()) {
 413                                        const char *hex = sha1_to_hex(sha1);
 414                                        if (multi_ack == 2) {
 415                                                sent_ready = 1;
 416                                                packet_write(1, "ACK %s ready\n", hex);
 417                                        } else
 418                                                packet_write(1, "ACK %s continue\n", hex);
 419                                }
 420                                break;
 421                        default:
 422                                got_common = 1;
 423                                memcpy(last_hex, sha1_to_hex(sha1), 41);
 424                                if (multi_ack == 2)
 425                                        packet_write(1, "ACK %s common\n", last_hex);
 426                                else if (multi_ack)
 427                                        packet_write(1, "ACK %s continue\n", last_hex);
 428                                else if (have_obj.nr == 1)
 429                                        packet_write(1, "ACK %s\n", last_hex);
 430                                break;
 431                        }
 432                        continue;
 433                }
 434                if (!strcmp(line, "done")) {
 435                        if (have_obj.nr > 0) {
 436                                if (multi_ack)
 437                                        packet_write(1, "ACK %s\n", last_hex);
 438                                return 0;
 439                        }
 440                        packet_write(1, "NAK\n");
 441                        return -1;
 442                }
 443                die("git upload-pack: expected SHA1 list, got '%s'", line);
 444        }
 445}
 446
 447static int is_our_ref(struct object *o)
 448{
 449        int allow_hidden_ref = (allow_unadvertised_object_request &
 450                        (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 451        return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 452}
 453
 454static void check_non_tip(void)
 455{
 456        static const char *argv[] = {
 457                "rev-list", "--stdin", NULL,
 458        };
 459        static struct child_process cmd = CHILD_PROCESS_INIT;
 460        struct object *o;
 461        char namebuf[42]; /* ^ + SHA-1 + LF */
 462        int i;
 463
 464        /*
 465         * In the normal in-process case without
 466         * uploadpack.allowReachableSHA1InWant,
 467         * non-tip requests can never happen.
 468         */
 469        if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 470                goto error;
 471
 472        cmd.argv = argv;
 473        cmd.git_cmd = 1;
 474        cmd.no_stderr = 1;
 475        cmd.in = -1;
 476        cmd.out = -1;
 477
 478        if (start_command(&cmd))
 479                goto error;
 480
 481        /*
 482         * If rev-list --stdin encounters an unknown commit, it
 483         * terminates, which will cause SIGPIPE in the write loop
 484         * below.
 485         */
 486        sigchain_push(SIGPIPE, SIG_IGN);
 487
 488        namebuf[0] = '^';
 489        namebuf[41] = '\n';
 490        for (i = get_max_object_index(); 0 < i; ) {
 491                o = get_indexed_object(--i);
 492                if (!o)
 493                        continue;
 494                if (!is_our_ref(o))
 495                        continue;
 496                memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 497                if (write_in_full(cmd.in, namebuf, 42) < 0)
 498                        goto error;
 499        }
 500        namebuf[40] = '\n';
 501        for (i = 0; i < want_obj.nr; i++) {
 502                o = want_obj.objects[i].item;
 503                if (is_our_ref(o))
 504                        continue;
 505                memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 506                if (write_in_full(cmd.in, namebuf, 41) < 0)
 507                        goto error;
 508        }
 509        close(cmd.in);
 510
 511        sigchain_pop(SIGPIPE);
 512
 513        /*
 514         * The commits out of the rev-list are not ancestors of
 515         * our ref.
 516         */
 517        i = read_in_full(cmd.out, namebuf, 1);
 518        if (i)
 519                goto error;
 520        close(cmd.out);
 521
 522        /*
 523         * rev-list may have died by encountering a bad commit
 524         * in the history, in which case we do want to bail out
 525         * even when it showed no commit.
 526         */
 527        if (finish_command(&cmd))
 528                goto error;
 529
 530        /* All the non-tip ones are ancestors of what we advertised */
 531        return;
 532
 533error:
 534        /* Pick one of them (we know there at least is one) */
 535        for (i = 0; i < want_obj.nr; i++) {
 536                o = want_obj.objects[i].item;
 537                if (!is_our_ref(o))
 538                        die("git upload-pack: not our ref %s",
 539                            oid_to_hex(&o->oid));
 540        }
 541}
 542
 543static void send_shallow(struct commit_list *result)
 544{
 545        while (result) {
 546                struct object *object = &result->item->object;
 547                if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 548                        packet_write(1, "shallow %s",
 549                                     oid_to_hex(&object->oid));
 550                        register_shallow(object->oid.hash);
 551                        shallow_nr++;
 552                }
 553                result = result->next;
 554        }
 555}
 556
 557static void send_unshallow(const struct object_array *shallows)
 558{
 559        int i;
 560
 561        for (i = 0; i < shallows->nr; i++) {
 562                struct object *object = shallows->objects[i].item;
 563                if (object->flags & NOT_SHALLOW) {
 564                        struct commit_list *parents;
 565                        packet_write(1, "unshallow %s",
 566                                     oid_to_hex(&object->oid));
 567                        object->flags &= ~CLIENT_SHALLOW;
 568                        /*
 569                         * We want to _register_ "object" as shallow, but we
 570                         * also need to traverse object's parents to deepen a
 571                         * shallow clone. Unregister it for now so we can
 572                         * parse and add the parents to the want list, then
 573                         * re-register it.
 574                         */
 575                        unregister_shallow(object->oid.hash);
 576                        object->parsed = 0;
 577                        parse_commit_or_die((struct commit *)object);
 578                        parents = ((struct commit *)object)->parents;
 579                        while (parents) {
 580                                add_object_array(&parents->item->object,
 581                                                 NULL, &want_obj);
 582                                parents = parents->next;
 583                        }
 584                        add_object_array(object, NULL, &extra_edge_obj);
 585                }
 586                /* make sure commit traversal conforms to client */
 587                register_shallow(object->oid.hash);
 588        }
 589}
 590
 591static void deepen(int depth, const struct object_array *shallows)
 592{
 593        if (depth == INFINITE_DEPTH && !is_repository_shallow()) {
 594                int i;
 595
 596                for (i = 0; i < shallows->nr; i++) {
 597                        struct object *object = shallows->objects[i].item;
 598                        object->flags |= NOT_SHALLOW;
 599                }
 600        } else {
 601                struct commit_list *result;
 602
 603                result = get_shallow_commits(&want_obj, depth,
 604                                             SHALLOW, NOT_SHALLOW);
 605                send_shallow(result);
 606                free_commit_list(result);
 607        }
 608
 609        send_unshallow(shallows);
 610        packet_flush(1);
 611}
 612
 613static void receive_needs(void)
 614{
 615        struct object_array shallows = OBJECT_ARRAY_INIT;
 616        int depth = 0;
 617        int has_non_tip = 0;
 618
 619        shallow_nr = 0;
 620        for (;;) {
 621                struct object *o;
 622                const char *features;
 623                unsigned char sha1_buf[20];
 624                char *line = packet_read_line(0, NULL);
 625                const char *arg;
 626
 627                reset_timeout();
 628                if (!line)
 629                        break;
 630
 631                if (skip_prefix(line, "shallow ", &arg)) {
 632                        unsigned char sha1[20];
 633                        struct object *object;
 634                        if (get_sha1_hex(arg, sha1))
 635                                die("invalid shallow line: %s", line);
 636                        object = parse_object(sha1);
 637                        if (!object)
 638                                continue;
 639                        if (object->type != OBJ_COMMIT)
 640                                die("invalid shallow object %s", sha1_to_hex(sha1));
 641                        if (!(object->flags & CLIENT_SHALLOW)) {
 642                                object->flags |= CLIENT_SHALLOW;
 643                                add_object_array(object, NULL, &shallows);
 644                        }
 645                        continue;
 646                }
 647                if (skip_prefix(line, "deepen ", &arg)) {
 648                        char *end;
 649                        depth = strtol(arg, &end, 0);
 650                        if (end == arg || depth <= 0)
 651                                die("Invalid deepen: %s", line);
 652                        continue;
 653                }
 654                if (!skip_prefix(line, "want ", &arg) ||
 655                    get_sha1_hex(arg, sha1_buf))
 656                        die("git upload-pack: protocol error, "
 657                            "expected to get sha, not '%s'", line);
 658
 659                features = arg + 40;
 660
 661                if (parse_feature_request(features, "multi_ack_detailed"))
 662                        multi_ack = 2;
 663                else if (parse_feature_request(features, "multi_ack"))
 664                        multi_ack = 1;
 665                if (parse_feature_request(features, "no-done"))
 666                        no_done = 1;
 667                if (parse_feature_request(features, "thin-pack"))
 668                        use_thin_pack = 1;
 669                if (parse_feature_request(features, "ofs-delta"))
 670                        use_ofs_delta = 1;
 671                if (parse_feature_request(features, "side-band-64k"))
 672                        use_sideband = LARGE_PACKET_MAX;
 673                else if (parse_feature_request(features, "side-band"))
 674                        use_sideband = DEFAULT_PACKET_MAX;
 675                if (parse_feature_request(features, "no-progress"))
 676                        no_progress = 1;
 677                if (parse_feature_request(features, "include-tag"))
 678                        use_include_tag = 1;
 679
 680                o = parse_object(sha1_buf);
 681                if (!o)
 682                        die("git upload-pack: not our ref %s",
 683                            sha1_to_hex(sha1_buf));
 684                if (!(o->flags & WANTED)) {
 685                        o->flags |= WANTED;
 686                        if (!is_our_ref(o))
 687                                has_non_tip = 1;
 688                        add_object_array(o, NULL, &want_obj);
 689                }
 690        }
 691
 692        /*
 693         * We have sent all our refs already, and the other end
 694         * should have chosen out of them. When we are operating
 695         * in the stateless RPC mode, however, their choice may
 696         * have been based on the set of older refs advertised
 697         * by another process that handled the initial request.
 698         */
 699        if (has_non_tip)
 700                check_non_tip();
 701
 702        if (!use_sideband && daemon_mode)
 703                no_progress = 1;
 704
 705        if (depth == 0 && shallows.nr == 0)
 706                return;
 707        if (depth > 0)
 708                deepen(depth, &shallows);
 709        else
 710                if (shallows.nr > 0) {
 711                        int i;
 712                        for (i = 0; i < shallows.nr; i++)
 713                                register_shallow(shallows.objects[i].item->oid.hash);
 714                }
 715
 716        shallow_nr += shallows.nr;
 717        free(shallows.objects);
 718}
 719
 720/* return non-zero if the ref is hidden, otherwise 0 */
 721static int mark_our_ref(const char *refname, const char *refname_full,
 722                        const struct object_id *oid)
 723{
 724        struct object *o = lookup_unknown_object(oid->hash);
 725
 726        if (ref_is_hidden(refname, refname_full)) {
 727                o->flags |= HIDDEN_REF;
 728                return 1;
 729        }
 730        o->flags |= OUR_REF;
 731        return 0;
 732}
 733
 734static int check_ref(const char *refname_full, const struct object_id *oid,
 735                     int flag, void *cb_data)
 736{
 737        const char *refname = strip_namespace(refname_full);
 738
 739        mark_our_ref(refname, refname_full, oid);
 740        return 0;
 741}
 742
 743static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 744{
 745        struct string_list_item *item;
 746
 747        if (!symref->nr)
 748                return;
 749        for_each_string_list_item(item, symref)
 750                strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 751}
 752
 753static int send_ref(const char *refname, const struct object_id *oid,
 754                    int flag, void *cb_data)
 755{
 756        static const char *capabilities = "multi_ack thin-pack side-band"
 757                " side-band-64k ofs-delta shallow no-progress"
 758                " include-tag multi_ack_detailed";
 759        const char *refname_nons = strip_namespace(refname);
 760        struct object_id peeled;
 761
 762        if (mark_our_ref(refname_nons, refname, oid))
 763                return 0;
 764
 765        if (capabilities) {
 766                struct strbuf symref_info = STRBUF_INIT;
 767
 768                format_symref_info(&symref_info, cb_data);
 769                packet_write(1, "%s %s%c%s%s%s%s%s agent=%s\n",
 770                             oid_to_hex(oid), refname_nons,
 771                             0, capabilities,
 772                             (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
 773                                     " allow-tip-sha1-in-want" : "",
 774                             (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
 775                                     " allow-reachable-sha1-in-want" : "",
 776                             stateless_rpc ? " no-done" : "",
 777                             symref_info.buf,
 778                             git_user_agent_sanitized());
 779                strbuf_release(&symref_info);
 780        } else {
 781                packet_write(1, "%s %s\n", oid_to_hex(oid), refname_nons);
 782        }
 783        capabilities = NULL;
 784        if (!peel_ref(refname, peeled.hash))
 785                packet_write(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
 786        return 0;
 787}
 788
 789static int find_symref(const char *refname, const struct object_id *oid,
 790                       int flag, void *cb_data)
 791{
 792        const char *symref_target;
 793        struct string_list_item *item;
 794        struct object_id unused;
 795
 796        if ((flag & REF_ISSYMREF) == 0)
 797                return 0;
 798        symref_target = resolve_ref_unsafe(refname, 0, unused.hash, &flag);
 799        if (!symref_target || (flag & REF_ISSYMREF) == 0)
 800                die("'%s' is a symref but it is not?", refname);
 801        item = string_list_append(cb_data, refname);
 802        item->util = xstrdup(symref_target);
 803        return 0;
 804}
 805
 806static void upload_pack(void)
 807{
 808        struct string_list symref = STRING_LIST_INIT_DUP;
 809
 810        head_ref_namespaced(find_symref, &symref);
 811
 812        if (advertise_refs || !stateless_rpc) {
 813                reset_timeout();
 814                head_ref_namespaced(send_ref, &symref);
 815                for_each_namespaced_ref(send_ref, &symref);
 816                advertise_shallow_grafts(1);
 817                packet_flush(1);
 818        } else {
 819                head_ref_namespaced(check_ref, NULL);
 820                for_each_namespaced_ref(check_ref, NULL);
 821        }
 822        string_list_clear(&symref, 1);
 823        if (advertise_refs)
 824                return;
 825
 826        receive_needs();
 827        if (want_obj.nr) {
 828                get_common_commits();
 829                create_pack_file();
 830        }
 831}
 832
 833static int upload_pack_config(const char *var, const char *value, void *unused)
 834{
 835        if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
 836                if (git_config_bool(var, value))
 837                        allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
 838                else
 839                        allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
 840        } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
 841                if (git_config_bool(var, value))
 842                        allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
 843                else
 844                        allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
 845        } else if (!strcmp("uploadpack.keepalive", var)) {
 846                keepalive = git_config_int(var, value);
 847                if (!keepalive)
 848                        keepalive = -1;
 849        }
 850        return parse_hide_refs_config(var, value, "uploadpack");
 851}
 852
 853int main(int argc, char **argv)
 854{
 855        char *dir;
 856        int i;
 857        int strict = 0;
 858
 859        git_setup_gettext();
 860
 861        packet_trace_identity("upload-pack");
 862        git_extract_argv0_path(argv[0]);
 863        check_replace_refs = 0;
 864
 865        for (i = 1; i < argc; i++) {
 866                const char *arg = argv[i];
 867
 868                if (arg[0] != '-')
 869                        break;
 870                if (!strcmp(arg, "--advertise-refs")) {
 871                        advertise_refs = 1;
 872                        continue;
 873                }
 874                if (!strcmp(arg, "--stateless-rpc")) {
 875                        stateless_rpc = 1;
 876                        continue;
 877                }
 878                if (!strcmp(arg, "--strict")) {
 879                        strict = 1;
 880                        continue;
 881                }
 882                if (skip_prefix(arg, "--timeout=", &arg)) {
 883                        timeout = atoi(arg);
 884                        daemon_mode = 1;
 885                        continue;
 886                }
 887                if (!strcmp(arg, "--")) {
 888                        i++;
 889                        break;
 890                }
 891        }
 892
 893        if (i != argc-1)
 894                usage(upload_pack_usage);
 895
 896        setup_path();
 897
 898        dir = argv[i];
 899
 900        if (!enter_repo(dir, strict))
 901                die("'%s' does not appear to be a git repository", dir);
 902
 903        git_config(upload_pack_config, NULL);
 904        upload_pack();
 905        return 0;
 906}