1d1deae18f9e0e0f350c74540b085ff674f2385b
   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
  30/* Remember to update object flag allocation in object.h */
  31#define THEY_HAVE       (1u << 11)
  32#define OUR_REF         (1u << 12)
  33#define WANTED          (1u << 13)
  34#define COMMON_KNOWN    (1u << 14)
  35
  36#define SHALLOW         (1u << 16)
  37#define NOT_SHALLOW     (1u << 17)
  38#define CLIENT_SHALLOW  (1u << 18)
  39#define HIDDEN_REF      (1u << 19)
  40
  41static timestamp_t oldest_have;
  42
  43static int deepen_relative;
  44static int multi_ack;
  45static int no_done;
  46static int use_thin_pack, use_ofs_delta, use_include_tag;
  47static int no_progress, daemon_mode;
  48/* Allow specifying sha1 if it is a ref tip. */
  49#define ALLOW_TIP_SHA1  01
  50/* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  51#define ALLOW_REACHABLE_SHA1    02
  52/* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  53#define ALLOW_ANY_SHA1  07
  54static unsigned int allow_unadvertised_object_request;
  55static int shallow_nr;
  56static struct object_array extra_edge_obj;
  57static unsigned int timeout;
  58static int keepalive = 5;
  59/* 0 for no sideband,
  60 * otherwise maximum packet size (up to 65520 bytes).
  61 */
  62static int use_sideband;
  63static int stateless_rpc;
  64static const char *pack_objects_hook;
  65
  66static int filter_capability_requested;
  67static int allow_filter;
  68static int allow_ref_in_want;
  69static struct list_objects_filter_options filter_options;
  70
  71static void reset_timeout(void)
  72{
  73        alarm(timeout);
  74}
  75
  76static void send_client_data(int fd, const char *data, ssize_t sz)
  77{
  78        if (use_sideband) {
  79                send_sideband(1, fd, data, sz, use_sideband);
  80                return;
  81        }
  82        if (fd == 3)
  83                /* emergency quit */
  84                fd = 2;
  85        if (fd == 2) {
  86                /* XXX: are we happy to lose stuff here? */
  87                xwrite(fd, data, sz);
  88                return;
  89        }
  90        write_or_die(fd, data, sz);
  91}
  92
  93static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  94{
  95        FILE *fp = cb_data;
  96        if (graft->nr_parent == -1)
  97                fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
  98        return 0;
  99}
 100
 101static void create_pack_file(const struct object_array *have_obj,
 102                             const struct object_array *want_obj)
 103{
 104        struct child_process pack_objects = CHILD_PROCESS_INIT;
 105        char data[8193], progress[128];
 106        char abort_msg[] = "aborting due to possible repository "
 107                "corruption on the remote side.";
 108        int buffered = -1;
 109        ssize_t sz;
 110        int i;
 111        FILE *pipe_fd;
 112
 113        if (!pack_objects_hook)
 114                pack_objects.git_cmd = 1;
 115        else {
 116                argv_array_push(&pack_objects.args, pack_objects_hook);
 117                argv_array_push(&pack_objects.args, "git");
 118                pack_objects.use_shell = 1;
 119        }
 120
 121        if (shallow_nr) {
 122                argv_array_push(&pack_objects.args, "--shallow-file");
 123                argv_array_push(&pack_objects.args, "");
 124        }
 125        argv_array_push(&pack_objects.args, "pack-objects");
 126        argv_array_push(&pack_objects.args, "--revs");
 127        if (use_thin_pack)
 128                argv_array_push(&pack_objects.args, "--thin");
 129
 130        argv_array_push(&pack_objects.args, "--stdout");
 131        if (shallow_nr)
 132                argv_array_push(&pack_objects.args, "--shallow");
 133        if (!no_progress)
 134                argv_array_push(&pack_objects.args, "--progress");
 135        if (use_ofs_delta)
 136                argv_array_push(&pack_objects.args, "--delta-base-offset");
 137        if (use_include_tag)
 138                argv_array_push(&pack_objects.args, "--include-tag");
 139        if (filter_options.filter_spec) {
 140                if (pack_objects.use_shell) {
 141                        struct strbuf buf = STRBUF_INIT;
 142                        sq_quote_buf(&buf, filter_options.filter_spec);
 143                        argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 144                        strbuf_release(&buf);
 145                } else {
 146                        argv_array_pushf(&pack_objects.args, "--filter=%s",
 147                                         filter_options.filter_spec);
 148                }
 149        }
 150
 151        pack_objects.in = -1;
 152        pack_objects.out = -1;
 153        pack_objects.err = -1;
 154
 155        if (start_command(&pack_objects))
 156                die("git upload-pack: unable to fork git-pack-objects");
 157
 158        pipe_fd = xfdopen(pack_objects.in, "w");
 159
 160        if (shallow_nr)
 161                for_each_commit_graft(write_one_shallow, pipe_fd);
 162
 163        for (i = 0; i < want_obj->nr; i++)
 164                fprintf(pipe_fd, "%s\n",
 165                        oid_to_hex(&want_obj->objects[i].item->oid));
 166        fprintf(pipe_fd, "--not\n");
 167        for (i = 0; i < have_obj->nr; i++)
 168                fprintf(pipe_fd, "%s\n",
 169                        oid_to_hex(&have_obj->objects[i].item->oid));
 170        for (i = 0; i < extra_edge_obj.nr; i++)
 171                fprintf(pipe_fd, "%s\n",
 172                        oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 173        fprintf(pipe_fd, "\n");
 174        fflush(pipe_fd);
 175        fclose(pipe_fd);
 176
 177        /* We read from pack_objects.err to capture stderr output for
 178         * progress bar, and pack_objects.out to capture the pack data.
 179         */
 180
 181        while (1) {
 182                struct pollfd pfd[2];
 183                int pe, pu, pollsize;
 184                int ret;
 185
 186                reset_timeout();
 187
 188                pollsize = 0;
 189                pe = pu = -1;
 190
 191                if (0 <= pack_objects.out) {
 192                        pfd[pollsize].fd = pack_objects.out;
 193                        pfd[pollsize].events = POLLIN;
 194                        pu = pollsize;
 195                        pollsize++;
 196                }
 197                if (0 <= pack_objects.err) {
 198                        pfd[pollsize].fd = pack_objects.err;
 199                        pfd[pollsize].events = POLLIN;
 200                        pe = pollsize;
 201                        pollsize++;
 202                }
 203
 204                if (!pollsize)
 205                        break;
 206
 207                ret = poll(pfd, pollsize,
 208                        keepalive < 0 ? -1 : 1000 * keepalive);
 209
 210                if (ret < 0) {
 211                        if (errno != EINTR) {
 212                                error_errno("poll failed, resuming");
 213                                sleep(1);
 214                        }
 215                        continue;
 216                }
 217                if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 218                        /* Status ready; we ship that in the side-band
 219                         * or dump to the standard error.
 220                         */
 221                        sz = xread(pack_objects.err, progress,
 222                                  sizeof(progress));
 223                        if (0 < sz)
 224                                send_client_data(2, progress, sz);
 225                        else if (sz == 0) {
 226                                close(pack_objects.err);
 227                                pack_objects.err = -1;
 228                        }
 229                        else
 230                                goto fail;
 231                        /* give priority to status messages */
 232                        continue;
 233                }
 234                if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 235                        /* Data ready; we keep the last byte to ourselves
 236                         * in case we detect broken rev-list, so that we
 237                         * can leave the stream corrupted.  This is
 238                         * unfortunate -- unpack-objects would happily
 239                         * accept a valid packdata with trailing garbage,
 240                         * so appending garbage after we pass all the
 241                         * pack data is not good enough to signal
 242                         * breakage to downstream.
 243                         */
 244                        char *cp = data;
 245                        ssize_t outsz = 0;
 246                        if (0 <= buffered) {
 247                                *cp++ = buffered;
 248                                outsz++;
 249                        }
 250                        sz = xread(pack_objects.out, cp,
 251                                  sizeof(data) - outsz);
 252                        if (0 < sz)
 253                                ;
 254                        else if (sz == 0) {
 255                                close(pack_objects.out);
 256                                pack_objects.out = -1;
 257                        }
 258                        else
 259                                goto fail;
 260                        sz += outsz;
 261                        if (1 < sz) {
 262                                buffered = data[sz-1] & 0xFF;
 263                                sz--;
 264                        }
 265                        else
 266                                buffered = -1;
 267                        send_client_data(1, data, sz);
 268                }
 269
 270                /*
 271                 * We hit the keepalive timeout without saying anything; send
 272                 * an empty message on the data sideband just to let the other
 273                 * side know we're still working on it, but don't have any data
 274                 * yet.
 275                 *
 276                 * If we don't have a sideband channel, there's no room in the
 277                 * protocol to say anything, so those clients are just out of
 278                 * luck.
 279                 */
 280                if (!ret && use_sideband) {
 281                        static const char buf[] = "0005\1";
 282                        write_or_die(1, buf, 5);
 283                }
 284        }
 285
 286        if (finish_command(&pack_objects)) {
 287                error("git upload-pack: git-pack-objects died with error.");
 288                goto fail;
 289        }
 290
 291        /* flush the data */
 292        if (0 <= buffered) {
 293                data[0] = buffered;
 294                send_client_data(1, data, 1);
 295                fprintf(stderr, "flushed.\n");
 296        }
 297        if (use_sideband)
 298                packet_flush(1);
 299        return;
 300
 301 fail:
 302        send_client_data(3, abort_msg, sizeof(abort_msg));
 303        die("git upload-pack: %s", abort_msg);
 304}
 305
 306static int got_oid(const char *hex, struct object_id *oid,
 307                   struct object_array *have_obj)
 308{
 309        struct object *o;
 310        int we_knew_they_have = 0;
 311
 312        if (get_oid_hex(hex, oid))
 313                die("git upload-pack: expected SHA1 object, got '%s'", hex);
 314        if (!has_object_file(oid))
 315                return -1;
 316
 317        o = parse_object(the_repository, oid);
 318        if (!o)
 319                die("oops (%s)", oid_to_hex(oid));
 320        if (o->type == OBJ_COMMIT) {
 321                struct commit_list *parents;
 322                struct commit *commit = (struct commit *)o;
 323                if (o->flags & THEY_HAVE)
 324                        we_knew_they_have = 1;
 325                else
 326                        o->flags |= THEY_HAVE;
 327                if (!oldest_have || (commit->date < oldest_have))
 328                        oldest_have = commit->date;
 329                for (parents = commit->parents;
 330                     parents;
 331                     parents = parents->next)
 332                        parents->item->object.flags |= THEY_HAVE;
 333        }
 334        if (!we_knew_they_have) {
 335                add_object_array(o, NULL, have_obj);
 336                return 1;
 337        }
 338        return 0;
 339}
 340
 341static int ok_to_give_up(const struct object_array *have_obj,
 342                         struct object_array *want_obj)
 343{
 344        uint32_t min_generation = GENERATION_NUMBER_ZERO;
 345
 346        if (!have_obj->nr)
 347                return 0;
 348
 349        return can_all_from_reach_with_flag(want_obj, THEY_HAVE,
 350                                            COMMON_KNOWN, oldest_have,
 351                                            min_generation);
 352}
 353
 354static int get_common_commits(struct object_array *have_obj,
 355                              struct object_array *want_obj)
 356{
 357        struct object_id oid;
 358        char last_hex[GIT_MAX_HEXSZ + 1];
 359        int got_common = 0;
 360        int got_other = 0;
 361        int sent_ready = 0;
 362
 363        save_commit_buffer = 0;
 364
 365        for (;;) {
 366                char *line = packet_read_line(0, NULL);
 367                const char *arg;
 368
 369                reset_timeout();
 370
 371                if (!line) {
 372                        if (multi_ack == 2 && got_common
 373                            && !got_other && ok_to_give_up(have_obj, want_obj)) {
 374                                sent_ready = 1;
 375                                packet_write_fmt(1, "ACK %s ready\n", last_hex);
 376                        }
 377                        if (have_obj->nr == 0 || multi_ack)
 378                                packet_write_fmt(1, "NAK\n");
 379
 380                        if (no_done && sent_ready) {
 381                                packet_write_fmt(1, "ACK %s\n", last_hex);
 382                                return 0;
 383                        }
 384                        if (stateless_rpc)
 385                                exit(0);
 386                        got_common = 0;
 387                        got_other = 0;
 388                        continue;
 389                }
 390                if (skip_prefix(line, "have ", &arg)) {
 391                        switch (got_oid(arg, &oid, have_obj)) {
 392                        case -1: /* they have what we do not */
 393                                got_other = 1;
 394                                if (multi_ack && ok_to_give_up(have_obj, want_obj)) {
 395                                        const char *hex = oid_to_hex(&oid);
 396                                        if (multi_ack == 2) {
 397                                                sent_ready = 1;
 398                                                packet_write_fmt(1, "ACK %s ready\n", hex);
 399                                        } else
 400                                                packet_write_fmt(1, "ACK %s continue\n", hex);
 401                                }
 402                                break;
 403                        default:
 404                                got_common = 1;
 405                                oid_to_hex_r(last_hex, &oid);
 406                                if (multi_ack == 2)
 407                                        packet_write_fmt(1, "ACK %s common\n", last_hex);
 408                                else if (multi_ack)
 409                                        packet_write_fmt(1, "ACK %s continue\n", last_hex);
 410                                else if (have_obj->nr == 1)
 411                                        packet_write_fmt(1, "ACK %s\n", last_hex);
 412                                break;
 413                        }
 414                        continue;
 415                }
 416                if (!strcmp(line, "done")) {
 417                        if (have_obj->nr > 0) {
 418                                if (multi_ack)
 419                                        packet_write_fmt(1, "ACK %s\n", last_hex);
 420                                return 0;
 421                        }
 422                        packet_write_fmt(1, "NAK\n");
 423                        return -1;
 424                }
 425                die("git upload-pack: expected SHA1 list, got '%s'", line);
 426        }
 427}
 428
 429static int is_our_ref(struct object *o)
 430{
 431        int allow_hidden_ref = (allow_unadvertised_object_request &
 432                        (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 433        return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 434}
 435
 436/*
 437 * on successful case, it's up to the caller to close cmd->out
 438 */
 439static int do_reachable_revlist(struct child_process *cmd,
 440                                struct object_array *src,
 441                                struct object_array *reachable)
 442{
 443        static const char *argv[] = {
 444                "rev-list", "--stdin", NULL,
 445        };
 446        struct object *o;
 447        char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 448        int i;
 449
 450        cmd->argv = argv;
 451        cmd->git_cmd = 1;
 452        cmd->no_stderr = 1;
 453        cmd->in = -1;
 454        cmd->out = -1;
 455
 456        /*
 457         * If the next rev-list --stdin encounters an unknown commit,
 458         * it terminates, which will cause SIGPIPE in the write loop
 459         * below.
 460         */
 461        sigchain_push(SIGPIPE, SIG_IGN);
 462
 463        if (start_command(cmd))
 464                goto error;
 465
 466        namebuf[0] = '^';
 467        namebuf[GIT_SHA1_HEXSZ + 1] = '\n';
 468        for (i = get_max_object_index(); 0 < i; ) {
 469                o = get_indexed_object(--i);
 470                if (!o)
 471                        continue;
 472                if (reachable && o->type == OBJ_COMMIT)
 473                        o->flags &= ~TMP_MARK;
 474                if (!is_our_ref(o))
 475                        continue;
 476                memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 477                if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 2) < 0)
 478                        goto error;
 479        }
 480        namebuf[GIT_SHA1_HEXSZ] = '\n';
 481        for (i = 0; i < src->nr; i++) {
 482                o = src->objects[i].item;
 483                if (is_our_ref(o)) {
 484                        if (reachable)
 485                                add_object_array(o, NULL, reachable);
 486                        continue;
 487                }
 488                if (reachable && o->type == OBJ_COMMIT)
 489                        o->flags |= TMP_MARK;
 490                memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 491                if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 1) < 0)
 492                        goto error;
 493        }
 494        close(cmd->in);
 495        cmd->in = -1;
 496        sigchain_pop(SIGPIPE);
 497
 498        return 0;
 499
 500error:
 501        sigchain_pop(SIGPIPE);
 502
 503        if (cmd->in >= 0)
 504                close(cmd->in);
 505        if (cmd->out >= 0)
 506                close(cmd->out);
 507        return -1;
 508}
 509
 510static int get_reachable_list(struct object_array *src,
 511                              struct object_array *reachable)
 512{
 513        struct child_process cmd = CHILD_PROCESS_INIT;
 514        int i;
 515        struct object *o;
 516        char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 517        const unsigned hexsz = the_hash_algo->hexsz;
 518
 519        if (do_reachable_revlist(&cmd, src, reachable) < 0)
 520                return -1;
 521
 522        while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 523                struct object_id sha1;
 524                const char *p;
 525
 526                if (parse_oid_hex(namebuf, &sha1, &p) || *p != '\n')
 527                        break;
 528
 529                o = lookup_object(the_repository, sha1.hash);
 530                if (o && o->type == OBJ_COMMIT) {
 531                        o->flags &= ~TMP_MARK;
 532                }
 533        }
 534        for (i = get_max_object_index(); 0 < i; i--) {
 535                o = get_indexed_object(i - 1);
 536                if (o && o->type == OBJ_COMMIT &&
 537                    (o->flags & TMP_MARK)) {
 538                        add_object_array(o, NULL, reachable);
 539                                o->flags &= ~TMP_MARK;
 540                }
 541        }
 542        close(cmd.out);
 543
 544        if (finish_command(&cmd))
 545                return -1;
 546
 547        return 0;
 548}
 549
 550static int has_unreachable(struct object_array *src)
 551{
 552        struct child_process cmd = CHILD_PROCESS_INIT;
 553        char buf[1];
 554        int i;
 555
 556        if (do_reachable_revlist(&cmd, src, NULL) < 0)
 557                return 1;
 558
 559        /*
 560         * The commits out of the rev-list are not ancestors of
 561         * our ref.
 562         */
 563        i = read_in_full(cmd.out, buf, 1);
 564        if (i)
 565                goto error;
 566        close(cmd.out);
 567        cmd.out = -1;
 568
 569        /*
 570         * rev-list may have died by encountering a bad commit
 571         * in the history, in which case we do want to bail out
 572         * even when it showed no commit.
 573         */
 574        if (finish_command(&cmd))
 575                goto error;
 576
 577        /* All the non-tip ones are ancestors of what we advertised */
 578        return 0;
 579
 580error:
 581        sigchain_pop(SIGPIPE);
 582        if (cmd.out >= 0)
 583                close(cmd.out);
 584        return 1;
 585}
 586
 587static void check_non_tip(struct object_array *want_obj)
 588{
 589        int i;
 590
 591        /*
 592         * In the normal in-process case without
 593         * uploadpack.allowReachableSHA1InWant,
 594         * non-tip requests can never happen.
 595         */
 596        if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 597                goto error;
 598        if (!has_unreachable(want_obj))
 599                /* All the non-tip ones are ancestors of what we advertised */
 600                return;
 601
 602error:
 603        /* Pick one of them (we know there at least is one) */
 604        for (i = 0; i < want_obj->nr; i++) {
 605                struct object *o = want_obj->objects[i].item;
 606                if (!is_our_ref(o))
 607                        die("git upload-pack: not our ref %s",
 608                            oid_to_hex(&o->oid));
 609        }
 610}
 611
 612static void send_shallow(struct commit_list *result)
 613{
 614        while (result) {
 615                struct object *object = &result->item->object;
 616                if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 617                        packet_write_fmt(1, "shallow %s",
 618                                         oid_to_hex(&object->oid));
 619                        register_shallow(the_repository, &object->oid);
 620                        shallow_nr++;
 621                }
 622                result = result->next;
 623        }
 624}
 625
 626static void send_unshallow(const struct object_array *shallows,
 627                           struct object_array *want_obj)
 628{
 629        int i;
 630
 631        for (i = 0; i < shallows->nr; i++) {
 632                struct object *object = shallows->objects[i].item;
 633                if (object->flags & NOT_SHALLOW) {
 634                        struct commit_list *parents;
 635                        packet_write_fmt(1, "unshallow %s",
 636                                         oid_to_hex(&object->oid));
 637                        object->flags &= ~CLIENT_SHALLOW;
 638                        /*
 639                         * We want to _register_ "object" as shallow, but we
 640                         * also need to traverse object's parents to deepen a
 641                         * shallow clone. Unregister it for now so we can
 642                         * parse and add the parents to the want list, then
 643                         * re-register it.
 644                         */
 645                        unregister_shallow(&object->oid);
 646                        object->parsed = 0;
 647                        parse_commit_or_die((struct commit *)object);
 648                        parents = ((struct commit *)object)->parents;
 649                        while (parents) {
 650                                add_object_array(&parents->item->object,
 651                                                 NULL, want_obj);
 652                                parents = parents->next;
 653                        }
 654                        add_object_array(object, NULL, &extra_edge_obj);
 655                }
 656                /* make sure commit traversal conforms to client */
 657                register_shallow(the_repository, &object->oid);
 658        }
 659}
 660
 661static void deepen(int depth, int deepen_relative,
 662                   struct object_array *shallows, struct object_array *want_obj)
 663{
 664        if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 665                int i;
 666
 667                for (i = 0; i < shallows->nr; i++) {
 668                        struct object *object = shallows->objects[i].item;
 669                        object->flags |= NOT_SHALLOW;
 670                }
 671        } else if (deepen_relative) {
 672                struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 673                struct commit_list *result;
 674
 675                get_reachable_list(shallows, &reachable_shallows);
 676                result = get_shallow_commits(&reachable_shallows,
 677                                             depth + 1,
 678                                             SHALLOW, NOT_SHALLOW);
 679                send_shallow(result);
 680                free_commit_list(result);
 681                object_array_clear(&reachable_shallows);
 682        } else {
 683                struct commit_list *result;
 684
 685                result = get_shallow_commits(want_obj, depth,
 686                                             SHALLOW, NOT_SHALLOW);
 687                send_shallow(result);
 688                free_commit_list(result);
 689        }
 690
 691        send_unshallow(shallows, want_obj);
 692}
 693
 694static void deepen_by_rev_list(int ac, const char **av,
 695                               struct object_array *shallows,
 696                               struct object_array *want_obj)
 697{
 698        struct commit_list *result;
 699
 700        close_commit_graph(the_repository);
 701        result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 702        send_shallow(result);
 703        free_commit_list(result);
 704        send_unshallow(shallows, want_obj);
 705}
 706
 707/* Returns 1 if a shallow list is sent or 0 otherwise */
 708static int send_shallow_list(int depth, int deepen_rev_list,
 709                             timestamp_t deepen_since,
 710                             struct string_list *deepen_not,
 711                             struct object_array *shallows,
 712                             struct object_array *want_obj)
 713{
 714        int ret = 0;
 715
 716        if (depth > 0 && deepen_rev_list)
 717                die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 718        if (depth > 0) {
 719                deepen(depth, deepen_relative, shallows, want_obj);
 720                ret = 1;
 721        } else if (deepen_rev_list) {
 722                struct argv_array av = ARGV_ARRAY_INIT;
 723                int i;
 724
 725                argv_array_push(&av, "rev-list");
 726                if (deepen_since)
 727                        argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 728                if (deepen_not->nr) {
 729                        argv_array_push(&av, "--not");
 730                        for (i = 0; i < deepen_not->nr; i++) {
 731                                struct string_list_item *s = deepen_not->items + i;
 732                                argv_array_push(&av, s->string);
 733                        }
 734                        argv_array_push(&av, "--not");
 735                }
 736                for (i = 0; i < want_obj->nr; i++) {
 737                        struct object *o = want_obj->objects[i].item;
 738                        argv_array_push(&av, oid_to_hex(&o->oid));
 739                }
 740                deepen_by_rev_list(av.argc, av.argv, shallows, want_obj);
 741                argv_array_clear(&av);
 742                ret = 1;
 743        } else {
 744                if (shallows->nr > 0) {
 745                        int i;
 746                        for (i = 0; i < shallows->nr; i++)
 747                                register_shallow(the_repository,
 748                                                 &shallows->objects[i].item->oid);
 749                }
 750        }
 751
 752        shallow_nr += shallows->nr;
 753        return ret;
 754}
 755
 756static int process_shallow(const char *line, struct object_array *shallows)
 757{
 758        const char *arg;
 759        if (skip_prefix(line, "shallow ", &arg)) {
 760                struct object_id oid;
 761                struct object *object;
 762                if (get_oid_hex(arg, &oid))
 763                        die("invalid shallow line: %s", line);
 764                object = parse_object(the_repository, &oid);
 765                if (!object)
 766                        return 1;
 767                if (object->type != OBJ_COMMIT)
 768                        die("invalid shallow object %s", oid_to_hex(&oid));
 769                if (!(object->flags & CLIENT_SHALLOW)) {
 770                        object->flags |= CLIENT_SHALLOW;
 771                        add_object_array(object, NULL, shallows);
 772                }
 773                return 1;
 774        }
 775
 776        return 0;
 777}
 778
 779static int process_deepen(const char *line, int *depth)
 780{
 781        const char *arg;
 782        if (skip_prefix(line, "deepen ", &arg)) {
 783                char *end = NULL;
 784                *depth = (int)strtol(arg, &end, 0);
 785                if (!end || *end || *depth <= 0)
 786                        die("Invalid deepen: %s", line);
 787                return 1;
 788        }
 789
 790        return 0;
 791}
 792
 793static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 794{
 795        const char *arg;
 796        if (skip_prefix(line, "deepen-since ", &arg)) {
 797                char *end = NULL;
 798                *deepen_since = parse_timestamp(arg, &end, 0);
 799                if (!end || *end || !deepen_since ||
 800                    /* revisions.c's max_age -1 is special */
 801                    *deepen_since == -1)
 802                        die("Invalid deepen-since: %s", line);
 803                *deepen_rev_list = 1;
 804                return 1;
 805        }
 806        return 0;
 807}
 808
 809static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 810{
 811        const char *arg;
 812        if (skip_prefix(line, "deepen-not ", &arg)) {
 813                char *ref = NULL;
 814                struct object_id oid;
 815                if (expand_ref(arg, strlen(arg), &oid, &ref) != 1)
 816                        die("git upload-pack: ambiguous deepen-not: %s", line);
 817                string_list_append(deepen_not, ref);
 818                free(ref);
 819                *deepen_rev_list = 1;
 820                return 1;
 821        }
 822        return 0;
 823}
 824
 825static void receive_needs(struct object_array *want_obj)
 826{
 827        struct object_array shallows = OBJECT_ARRAY_INIT;
 828        struct string_list deepen_not = STRING_LIST_INIT_DUP;
 829        int depth = 0;
 830        int has_non_tip = 0;
 831        timestamp_t deepen_since = 0;
 832        int deepen_rev_list = 0;
 833
 834        shallow_nr = 0;
 835        for (;;) {
 836                struct object *o;
 837                const char *features;
 838                struct object_id oid_buf;
 839                char *line = packet_read_line(0, NULL);
 840                const char *arg;
 841
 842                reset_timeout();
 843                if (!line)
 844                        break;
 845
 846                if (process_shallow(line, &shallows))
 847                        continue;
 848                if (process_deepen(line, &depth))
 849                        continue;
 850                if (process_deepen_since(line, &deepen_since, &deepen_rev_list))
 851                        continue;
 852                if (process_deepen_not(line, &deepen_not, &deepen_rev_list))
 853                        continue;
 854
 855                if (skip_prefix(line, "filter ", &arg)) {
 856                        if (!filter_capability_requested)
 857                                die("git upload-pack: filtering capability not negotiated");
 858                        parse_list_objects_filter(&filter_options, arg);
 859                        continue;
 860                }
 861
 862                if (!skip_prefix(line, "want ", &arg) ||
 863                    parse_oid_hex(arg, &oid_buf, &features))
 864                        die("git upload-pack: protocol error, "
 865                            "expected to get object ID, not '%s'", line);
 866
 867                if (parse_feature_request(features, "deepen-relative"))
 868                        deepen_relative = 1;
 869                if (parse_feature_request(features, "multi_ack_detailed"))
 870                        multi_ack = 2;
 871                else if (parse_feature_request(features, "multi_ack"))
 872                        multi_ack = 1;
 873                if (parse_feature_request(features, "no-done"))
 874                        no_done = 1;
 875                if (parse_feature_request(features, "thin-pack"))
 876                        use_thin_pack = 1;
 877                if (parse_feature_request(features, "ofs-delta"))
 878                        use_ofs_delta = 1;
 879                if (parse_feature_request(features, "side-band-64k"))
 880                        use_sideband = LARGE_PACKET_MAX;
 881                else if (parse_feature_request(features, "side-band"))
 882                        use_sideband = DEFAULT_PACKET_MAX;
 883                if (parse_feature_request(features, "no-progress"))
 884                        no_progress = 1;
 885                if (parse_feature_request(features, "include-tag"))
 886                        use_include_tag = 1;
 887                if (allow_filter && parse_feature_request(features, "filter"))
 888                        filter_capability_requested = 1;
 889
 890                o = parse_object(the_repository, &oid_buf);
 891                if (!o) {
 892                        packet_write_fmt(1,
 893                                         "ERR upload-pack: not our ref %s",
 894                                         oid_to_hex(&oid_buf));
 895                        die("git upload-pack: not our ref %s",
 896                            oid_to_hex(&oid_buf));
 897                }
 898                if (!(o->flags & WANTED)) {
 899                        o->flags |= WANTED;
 900                        if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 901                              || is_our_ref(o)))
 902                                has_non_tip = 1;
 903                        add_object_array(o, NULL, want_obj);
 904                }
 905        }
 906
 907        /*
 908         * We have sent all our refs already, and the other end
 909         * should have chosen out of them. When we are operating
 910         * in the stateless RPC mode, however, their choice may
 911         * have been based on the set of older refs advertised
 912         * by another process that handled the initial request.
 913         */
 914        if (has_non_tip)
 915                check_non_tip(want_obj);
 916
 917        if (!use_sideband && daemon_mode)
 918                no_progress = 1;
 919
 920        if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
 921                return;
 922
 923        if (send_shallow_list(depth, deepen_rev_list, deepen_since,
 924                              &deepen_not, &shallows, want_obj))
 925                packet_flush(1);
 926        object_array_clear(&shallows);
 927}
 928
 929/* return non-zero if the ref is hidden, otherwise 0 */
 930static int mark_our_ref(const char *refname, const char *refname_full,
 931                        const struct object_id *oid)
 932{
 933        struct object *o = lookup_unknown_object(oid->hash);
 934
 935        if (ref_is_hidden(refname, refname_full)) {
 936                o->flags |= HIDDEN_REF;
 937                return 1;
 938        }
 939        o->flags |= OUR_REF;
 940        return 0;
 941}
 942
 943static int check_ref(const char *refname_full, const struct object_id *oid,
 944                     int flag, void *cb_data)
 945{
 946        const char *refname = strip_namespace(refname_full);
 947
 948        mark_our_ref(refname, refname_full, oid);
 949        return 0;
 950}
 951
 952static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 953{
 954        struct string_list_item *item;
 955
 956        if (!symref->nr)
 957                return;
 958        for_each_string_list_item(item, symref)
 959                strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 960}
 961
 962static int send_ref(const char *refname, const struct object_id *oid,
 963                    int flag, void *cb_data)
 964{
 965        static const char *capabilities = "multi_ack thin-pack side-band"
 966                " side-band-64k ofs-delta shallow deepen-since deepen-not"
 967                " deepen-relative no-progress include-tag multi_ack_detailed";
 968        const char *refname_nons = strip_namespace(refname);
 969        struct object_id peeled;
 970
 971        if (mark_our_ref(refname_nons, refname, oid))
 972                return 0;
 973
 974        if (capabilities) {
 975                struct strbuf symref_info = STRBUF_INIT;
 976
 977                format_symref_info(&symref_info, cb_data);
 978                packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
 979                             oid_to_hex(oid), refname_nons,
 980                             0, capabilities,
 981                             (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
 982                                     " allow-tip-sha1-in-want" : "",
 983                             (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
 984                                     " allow-reachable-sha1-in-want" : "",
 985                             stateless_rpc ? " no-done" : "",
 986                             symref_info.buf,
 987                             allow_filter ? " filter" : "",
 988                             git_user_agent_sanitized());
 989                strbuf_release(&symref_info);
 990        } else {
 991                packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
 992        }
 993        capabilities = NULL;
 994        if (!peel_ref(refname, &peeled))
 995                packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
 996        return 0;
 997}
 998
 999static int find_symref(const char *refname, const struct object_id *oid,
1000                       int flag, void *cb_data)
1001{
1002        const char *symref_target;
1003        struct string_list_item *item;
1004
1005        if ((flag & REF_ISSYMREF) == 0)
1006                return 0;
1007        symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1008        if (!symref_target || (flag & REF_ISSYMREF) == 0)
1009                die("'%s' is a symref but it is not?", refname);
1010        item = string_list_append(cb_data, refname);
1011        item->util = xstrdup(symref_target);
1012        return 0;
1013}
1014
1015static int upload_pack_config(const char *var, const char *value, void *unused)
1016{
1017        if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1018                if (git_config_bool(var, value))
1019                        allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1020                else
1021                        allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1022        } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1023                if (git_config_bool(var, value))
1024                        allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1025                else
1026                        allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1027        } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1028                if (git_config_bool(var, value))
1029                        allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1030                else
1031                        allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1032        } else if (!strcmp("uploadpack.keepalive", var)) {
1033                keepalive = git_config_int(var, value);
1034                if (!keepalive)
1035                        keepalive = -1;
1036        } else if (current_config_scope() != CONFIG_SCOPE_REPO) {
1037                if (!strcmp("uploadpack.packobjectshook", var))
1038                        return git_config_string(&pack_objects_hook, var, value);
1039        } else if (!strcmp("uploadpack.allowfilter", var)) {
1040                allow_filter = git_config_bool(var, value);
1041        } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1042                allow_ref_in_want = git_config_bool(var, value);
1043        }
1044        return parse_hide_refs_config(var, value, "uploadpack");
1045}
1046
1047void upload_pack(struct upload_pack_options *options)
1048{
1049        struct string_list symref = STRING_LIST_INIT_DUP;
1050        struct object_array want_obj = OBJECT_ARRAY_INIT;
1051
1052        stateless_rpc = options->stateless_rpc;
1053        timeout = options->timeout;
1054        daemon_mode = options->daemon_mode;
1055
1056        git_config(upload_pack_config, NULL);
1057
1058        head_ref_namespaced(find_symref, &symref);
1059
1060        if (options->advertise_refs || !stateless_rpc) {
1061                reset_timeout();
1062                head_ref_namespaced(send_ref, &symref);
1063                for_each_namespaced_ref(send_ref, &symref);
1064                advertise_shallow_grafts(1);
1065                packet_flush(1);
1066        } else {
1067                head_ref_namespaced(check_ref, NULL);
1068                for_each_namespaced_ref(check_ref, NULL);
1069        }
1070        string_list_clear(&symref, 1);
1071        if (options->advertise_refs)
1072                return;
1073
1074        receive_needs(&want_obj);
1075        if (want_obj.nr) {
1076                struct object_array have_obj = OBJECT_ARRAY_INIT;
1077                get_common_commits(&have_obj, &want_obj);
1078                create_pack_file(&have_obj, &want_obj);
1079        }
1080}
1081
1082struct upload_pack_data {
1083        struct object_array wants;
1084        struct string_list wanted_refs;
1085        struct oid_array haves;
1086
1087        struct object_array shallows;
1088        struct string_list deepen_not;
1089        int depth;
1090        timestamp_t deepen_since;
1091        int deepen_rev_list;
1092        int deepen_relative;
1093
1094        unsigned stateless_rpc : 1;
1095
1096        unsigned use_thin_pack : 1;
1097        unsigned use_ofs_delta : 1;
1098        unsigned no_progress : 1;
1099        unsigned use_include_tag : 1;
1100        unsigned done : 1;
1101};
1102
1103static void upload_pack_data_init(struct upload_pack_data *data)
1104{
1105        struct object_array wants = OBJECT_ARRAY_INIT;
1106        struct string_list wanted_refs = STRING_LIST_INIT_DUP;
1107        struct oid_array haves = OID_ARRAY_INIT;
1108        struct object_array shallows = OBJECT_ARRAY_INIT;
1109        struct string_list deepen_not = STRING_LIST_INIT_DUP;
1110
1111        memset(data, 0, sizeof(*data));
1112        data->wants = wants;
1113        data->wanted_refs = wanted_refs;
1114        data->haves = haves;
1115        data->shallows = shallows;
1116        data->deepen_not = deepen_not;
1117}
1118
1119static void upload_pack_data_clear(struct upload_pack_data *data)
1120{
1121        object_array_clear(&data->wants);
1122        string_list_clear(&data->wanted_refs, 1);
1123        oid_array_clear(&data->haves);
1124        object_array_clear(&data->shallows);
1125        string_list_clear(&data->deepen_not, 0);
1126}
1127
1128static int parse_want(const char *line, struct object_array *want_obj)
1129{
1130        const char *arg;
1131        if (skip_prefix(line, "want ", &arg)) {
1132                struct object_id oid;
1133                struct object *o;
1134
1135                if (get_oid_hex(arg, &oid))
1136                        die("git upload-pack: protocol error, "
1137                            "expected to get oid, not '%s'", line);
1138
1139                o = parse_object(the_repository, &oid);
1140                if (!o) {
1141                        packet_write_fmt(1,
1142                                         "ERR upload-pack: not our ref %s",
1143                                         oid_to_hex(&oid));
1144                        die("git upload-pack: not our ref %s",
1145                            oid_to_hex(&oid));
1146                }
1147
1148                if (!(o->flags & WANTED)) {
1149                        o->flags |= WANTED;
1150                        add_object_array(o, NULL, want_obj);
1151                }
1152
1153                return 1;
1154        }
1155
1156        return 0;
1157}
1158
1159static int parse_want_ref(const char *line, struct string_list *wanted_refs,
1160                          struct object_array *want_obj)
1161{
1162        const char *arg;
1163        if (skip_prefix(line, "want-ref ", &arg)) {
1164                struct object_id oid;
1165                struct string_list_item *item;
1166                struct object *o;
1167
1168                if (read_ref(arg, &oid)) {
1169                        packet_write_fmt(1, "ERR unknown ref %s", arg);
1170                        die("unknown ref %s", arg);
1171                }
1172
1173                item = string_list_append(wanted_refs, arg);
1174                item->util = oiddup(&oid);
1175
1176                o = parse_object_or_die(&oid, arg);
1177                if (!(o->flags & WANTED)) {
1178                        o->flags |= WANTED;
1179                        add_object_array(o, NULL, want_obj);
1180                }
1181
1182                return 1;
1183        }
1184
1185        return 0;
1186}
1187
1188static int parse_have(const char *line, struct oid_array *haves)
1189{
1190        const char *arg;
1191        if (skip_prefix(line, "have ", &arg)) {
1192                struct object_id oid;
1193
1194                if (get_oid_hex(arg, &oid))
1195                        die("git upload-pack: expected SHA1 object, got '%s'", arg);
1196                oid_array_append(haves, &oid);
1197                return 1;
1198        }
1199
1200        return 0;
1201}
1202
1203static void process_args(struct packet_reader *request,
1204                         struct upload_pack_data *data,
1205                         struct object_array *want_obj)
1206{
1207        while (packet_reader_read(request) != PACKET_READ_FLUSH) {
1208                const char *arg = request->line;
1209                const char *p;
1210
1211                /* process want */
1212                if (parse_want(arg, want_obj))
1213                        continue;
1214                if (allow_ref_in_want &&
1215                    parse_want_ref(arg, &data->wanted_refs, want_obj))
1216                        continue;
1217                /* process have line */
1218                if (parse_have(arg, &data->haves))
1219                        continue;
1220
1221                /* process args like thin-pack */
1222                if (!strcmp(arg, "thin-pack")) {
1223                        use_thin_pack = 1;
1224                        continue;
1225                }
1226                if (!strcmp(arg, "ofs-delta")) {
1227                        use_ofs_delta = 1;
1228                        continue;
1229                }
1230                if (!strcmp(arg, "no-progress")) {
1231                        no_progress = 1;
1232                        continue;
1233                }
1234                if (!strcmp(arg, "include-tag")) {
1235                        use_include_tag = 1;
1236                        continue;
1237                }
1238                if (!strcmp(arg, "done")) {
1239                        data->done = 1;
1240                        continue;
1241                }
1242
1243                /* Shallow related arguments */
1244                if (process_shallow(arg, &data->shallows))
1245                        continue;
1246                if (process_deepen(arg, &data->depth))
1247                        continue;
1248                if (process_deepen_since(arg, &data->deepen_since,
1249                                         &data->deepen_rev_list))
1250                        continue;
1251                if (process_deepen_not(arg, &data->deepen_not,
1252                                       &data->deepen_rev_list))
1253                        continue;
1254                if (!strcmp(arg, "deepen-relative")) {
1255                        data->deepen_relative = 1;
1256                        continue;
1257                }
1258
1259                if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1260                        parse_list_objects_filter(&filter_options, p);
1261                        continue;
1262                }
1263
1264                /* ignore unknown lines maybe? */
1265                die("unexpected line: '%s'", arg);
1266        }
1267}
1268
1269static int process_haves(struct oid_array *haves, struct oid_array *common,
1270                         struct object_array *have_obj)
1271{
1272        int i;
1273
1274        /* Process haves */
1275        for (i = 0; i < haves->nr; i++) {
1276                const struct object_id *oid = &haves->oid[i];
1277                struct object *o;
1278                int we_knew_they_have = 0;
1279
1280                if (!has_object_file(oid))
1281                        continue;
1282
1283                oid_array_append(common, oid);
1284
1285                o = parse_object(the_repository, oid);
1286                if (!o)
1287                        die("oops (%s)", oid_to_hex(oid));
1288                if (o->type == OBJ_COMMIT) {
1289                        struct commit_list *parents;
1290                        struct commit *commit = (struct commit *)o;
1291                        if (o->flags & THEY_HAVE)
1292                                we_knew_they_have = 1;
1293                        else
1294                                o->flags |= THEY_HAVE;
1295                        if (!oldest_have || (commit->date < oldest_have))
1296                                oldest_have = commit->date;
1297                        for (parents = commit->parents;
1298                             parents;
1299                             parents = parents->next)
1300                                parents->item->object.flags |= THEY_HAVE;
1301                }
1302                if (!we_knew_they_have)
1303                        add_object_array(o, NULL, have_obj);
1304        }
1305
1306        return 0;
1307}
1308
1309static int send_acks(struct oid_array *acks, struct strbuf *response,
1310                     const struct object_array *have_obj,
1311                     struct object_array *want_obj)
1312{
1313        int i;
1314
1315        packet_buf_write(response, "acknowledgments\n");
1316
1317        /* Send Acks */
1318        if (!acks->nr)
1319                packet_buf_write(response, "NAK\n");
1320
1321        for (i = 0; i < acks->nr; i++) {
1322                packet_buf_write(response, "ACK %s\n",
1323                                 oid_to_hex(&acks->oid[i]));
1324        }
1325
1326        if (ok_to_give_up(have_obj, want_obj)) {
1327                /* Send Ready */
1328                packet_buf_write(response, "ready\n");
1329                return 1;
1330        }
1331
1332        return 0;
1333}
1334
1335static int process_haves_and_send_acks(struct upload_pack_data *data,
1336                                       struct object_array *have_obj,
1337                                       struct object_array *want_obj)
1338{
1339        struct oid_array common = OID_ARRAY_INIT;
1340        struct strbuf response = STRBUF_INIT;
1341        int ret = 0;
1342
1343        process_haves(&data->haves, &common, have_obj);
1344        if (data->done) {
1345                ret = 1;
1346        } else if (send_acks(&common, &response, have_obj, want_obj)) {
1347                packet_buf_delim(&response);
1348                ret = 1;
1349        } else {
1350                /* Add Flush */
1351                packet_buf_flush(&response);
1352                ret = 0;
1353        }
1354
1355        /* Send response */
1356        write_or_die(1, response.buf, response.len);
1357        strbuf_release(&response);
1358
1359        oid_array_clear(&data->haves);
1360        oid_array_clear(&common);
1361        return ret;
1362}
1363
1364static void send_wanted_ref_info(struct upload_pack_data *data)
1365{
1366        const struct string_list_item *item;
1367
1368        if (!data->wanted_refs.nr)
1369                return;
1370
1371        packet_write_fmt(1, "wanted-refs\n");
1372
1373        for_each_string_list_item(item, &data->wanted_refs) {
1374                packet_write_fmt(1, "%s %s\n",
1375                                 oid_to_hex(item->util),
1376                                 item->string);
1377        }
1378
1379        packet_delim(1);
1380}
1381
1382static void send_shallow_info(struct upload_pack_data *data,
1383                              struct object_array *want_obj)
1384{
1385        /* No shallow info needs to be sent */
1386        if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1387            !is_repository_shallow(the_repository))
1388                return;
1389
1390        packet_write_fmt(1, "shallow-info\n");
1391
1392        if (!send_shallow_list(data->depth, data->deepen_rev_list,
1393                               data->deepen_since, &data->deepen_not,
1394                               &data->shallows, want_obj) &&
1395            is_repository_shallow(the_repository))
1396                deepen(INFINITE_DEPTH, data->deepen_relative, &data->shallows,
1397                       want_obj);
1398
1399        packet_delim(1);
1400}
1401
1402enum fetch_state {
1403        FETCH_PROCESS_ARGS = 0,
1404        FETCH_SEND_ACKS,
1405        FETCH_SEND_PACK,
1406        FETCH_DONE,
1407};
1408
1409int upload_pack_v2(struct repository *r, struct argv_array *keys,
1410                   struct packet_reader *request)
1411{
1412        enum fetch_state state = FETCH_PROCESS_ARGS;
1413        struct upload_pack_data data;
1414        /* NEEDSWORK: make this non-static */
1415        static struct object_array have_obj;
1416        /* NEEDSWORK: make this non-static */
1417        static struct object_array want_obj;
1418
1419        git_config(upload_pack_config, NULL);
1420
1421        upload_pack_data_init(&data);
1422        use_sideband = LARGE_PACKET_MAX;
1423
1424        while (state != FETCH_DONE) {
1425                switch (state) {
1426                case FETCH_PROCESS_ARGS:
1427                        process_args(request, &data, &want_obj);
1428
1429                        if (!want_obj.nr) {
1430                                /*
1431                                 * Request didn't contain any 'want' lines,
1432                                 * guess they didn't want anything.
1433                                 */
1434                                state = FETCH_DONE;
1435                        } else if (data.haves.nr) {
1436                                /*
1437                                 * Request had 'have' lines, so lets ACK them.
1438                                 */
1439                                state = FETCH_SEND_ACKS;
1440                        } else {
1441                                /*
1442                                 * Request had 'want's but no 'have's so we can
1443                                 * immedietly go to construct and send a pack.
1444                                 */
1445                                state = FETCH_SEND_PACK;
1446                        }
1447                        break;
1448                case FETCH_SEND_ACKS:
1449                        if (process_haves_and_send_acks(&data, &have_obj,
1450                                                        &want_obj))
1451                                state = FETCH_SEND_PACK;
1452                        else
1453                                state = FETCH_DONE;
1454                        break;
1455                case FETCH_SEND_PACK:
1456                        send_wanted_ref_info(&data);
1457                        send_shallow_info(&data, &want_obj);
1458
1459                        packet_write_fmt(1, "packfile\n");
1460                        create_pack_file(&have_obj, &want_obj);
1461                        state = FETCH_DONE;
1462                        break;
1463                case FETCH_DONE:
1464                        continue;
1465                }
1466        }
1467
1468        upload_pack_data_clear(&data);
1469        return 0;
1470}
1471
1472int upload_pack_advertise(struct repository *r,
1473                          struct strbuf *value)
1474{
1475        if (value) {
1476                int allow_filter_value;
1477                int allow_ref_in_want;
1478
1479                strbuf_addstr(value, "shallow");
1480
1481                if (!repo_config_get_bool(the_repository,
1482                                         "uploadpack.allowfilter",
1483                                         &allow_filter_value) &&
1484                    allow_filter_value)
1485                        strbuf_addstr(value, " filter");
1486
1487                if (!repo_config_get_bool(the_repository,
1488                                         "uploadpack.allowrefinwant",
1489                                         &allow_ref_in_want) &&
1490                    allow_ref_in_want)
1491                        strbuf_addstr(value, " ref-in-want");
1492        }
1493
1494        return 1;
1495}