git.oblomov.eu Git - git/blob - upload-pack.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "refs.h"
   4 #include "pkt-line.h"
   5 #include "sideband.h"
   6 #include "repository.h"
   7 #include "object-store.h"
   8 #include "tag.h"
   9 #include "object.h"
  10 #include "commit.h"
  11 #include "diff.h"
  12 #include "revision.h"
  13 #include "list-objects.h"
  14 #include "list-objects-filter.h"
  15 #include "list-objects-filter-options.h"
  16 #include "run-command.h"
  17 #include "connect.h"
  18 #include "sigchain.h"
  19 #include "version.h"
  20 #include "string-list.h"
  21 #include "argv-array.h"
  22 #include "prio-queue.h"
  23 #include "protocol.h"
  24 #include "quote.h"
  25 #include "upload-pack.h"
  26 #include "serve.h"
  27 #include "commit-graph.h"
  28 #include "commit-reach.h"
  29 #include "shallow.h"
  30
  31 /* Remember to update object flag allocation in object.h */
  32 #define THEY_HAVE       (1u << 11)
  33 #define OUR_REF         (1u << 12)
  34 #define WANTED          (1u << 13)
  35 #define COMMON_KNOWN    (1u << 14)
  36
  37 #define SHALLOW         (1u << 16)
  38 #define NOT_SHALLOW     (1u << 17)
  39 #define CLIENT_SHALLOW  (1u << 18)
  40 #define HIDDEN_REF      (1u << 19)
  41
  42 #define ALL_FLAGS (THEY_HAVE | OUR_REF | WANTED | COMMON_KNOWN | SHALLOW | \
  43                 NOT_SHALLOW | CLIENT_SHALLOW | HIDDEN_REF)
  44
  45 static timestamp_t oldest_have;
  46
  47 /* Allow specifying sha1 if it is a ref tip. */
  48 #define ALLOW_TIP_SHA1  01
  49 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  50 #define ALLOW_REACHABLE_SHA1    02
  51 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  52 #define ALLOW_ANY_SHA1  07
  53 static unsigned int allow_unadvertised_object_request;
  54 static int shallow_nr;
  55 static struct object_array extra_edge_obj;
  56 static const char *pack_objects_hook;
  57
  58 static int allow_sideband_all;
  59
  60 /*
  61  * Please annotate, and if possible group together, fields used only
  62  * for protocol v0 or only for protocol v2.
  63  */
  64 struct upload_pack_data {
  65         struct string_list symref;                              /* v0 only */
  66         struct object_array want_obj;
  67         struct object_array have_obj;
  68         struct oid_array haves;                                 /* v2 only */
  69         struct string_list wanted_refs;                         /* v2 only */
  70
  71         struct object_array shallows;
  72         struct string_list deepen_not;
  73         int depth;
  74         timestamp_t deepen_since;
  75         int deepen_rev_list;
  76         int deepen_relative;
  77         int keepalive;
  78
  79         unsigned int timeout;                                   /* v0 only */
  80         enum {
  81                 NO_MULTI_ACK = 0,
  82                 MULTI_ACK = 1,
  83                 MULTI_ACK_DETAILED = 2
  84         } multi_ack;                                            /* v0 only */
  85
  86         /* 0 for no sideband, otherwise DEFAULT_PACKET_MAX or LARGE_PACKET_MAX */
  87         int use_sideband;
  88
  89         struct list_objects_filter_options filter_options;
  90
  91         struct packet_writer writer;
  92
  93         unsigned stateless_rpc : 1;                             /* v0 only */
  94         unsigned no_done : 1;                                   /* v0 only */
  95         unsigned daemon_mode : 1;                               /* v0 only */
  96         unsigned filter_capability_requested : 1;               /* v0 only */
  97
  98         unsigned use_thin_pack : 1;
  99         unsigned use_ofs_delta : 1;
 100         unsigned no_progress : 1;
 101         unsigned use_include_tag : 1;
 102         unsigned allow_filter : 1;
 103
 104         unsigned done : 1;                                      /* v2 only */
 105         unsigned allow_ref_in_want : 1;                         /* v2 only */
 106 };
 107
 108 static void upload_pack_data_init(struct upload_pack_data *data)
 109 {
 110         struct string_list symref = STRING_LIST_INIT_DUP;
 111         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
 112         struct object_array want_obj = OBJECT_ARRAY_INIT;
 113         struct object_array have_obj = OBJECT_ARRAY_INIT;
 114         struct oid_array haves = OID_ARRAY_INIT;
 115         struct object_array shallows = OBJECT_ARRAY_INIT;
 116         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 117
 118         memset(data, 0, sizeof(*data));
 119         data->symref = symref;
 120         data->wanted_refs = wanted_refs;
 121         data->want_obj = want_obj;
 122         data->have_obj = have_obj;
 123         data->haves = haves;
 124         data->shallows = shallows;
 125         data->deepen_not = deepen_not;
 126         packet_writer_init(&data->writer, 1);
 127
 128         data->keepalive = 5;
 129 }
 130
 131 static void upload_pack_data_clear(struct upload_pack_data *data)
 132 {
 133         string_list_clear(&data->symref, 1);
 134         string_list_clear(&data->wanted_refs, 1);
 135         object_array_clear(&data->want_obj);
 136         object_array_clear(&data->have_obj);
 137         oid_array_clear(&data->haves);
 138         object_array_clear(&data->shallows);
 139         string_list_clear(&data->deepen_not, 0);
 140         list_objects_filter_release(&data->filter_options);
 141 }
 142
 143 static void reset_timeout(unsigned int timeout)
 144 {
 145         alarm(timeout);
 146 }
 147
 148 static void send_client_data(int fd, const char *data, ssize_t sz,
 149                              int use_sideband)
 150 {
 151         if (use_sideband) {
 152                 send_sideband(1, fd, data, sz, use_sideband);
 153                 return;
 154         }
 155         if (fd == 3)
 156                 /* emergency quit */
 157                 fd = 2;
 158         if (fd == 2) {
 159                 /* XXX: are we happy to lose stuff here? */
 160                 xwrite(fd, data, sz);
 161                 return;
 162         }
 163         write_or_die(fd, data, sz);
 164 }
 165
 166 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
 167 {
 168         FILE *fp = cb_data;
 169         if (graft->nr_parent == -1)
 170                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
 171         return 0;
 172 }
 173
 174 static void create_pack_file(struct upload_pack_data *pack_data)
 175 {
 176         struct child_process pack_objects = CHILD_PROCESS_INIT;
 177         char data[8193], progress[128];
 178         char abort_msg[] = "aborting due to possible repository "
 179                 "corruption on the remote side.";
 180         int buffered = -1;
 181         ssize_t sz;
 182         int i;
 183         FILE *pipe_fd;
 184
 185         if (!pack_objects_hook)
 186                 pack_objects.git_cmd = 1;
 187         else {
 188                 argv_array_push(&pack_objects.args, pack_objects_hook);
 189                 argv_array_push(&pack_objects.args, "git");
 190                 pack_objects.use_shell = 1;
 191         }
 192
 193         if (shallow_nr) {
 194                 argv_array_push(&pack_objects.args, "--shallow-file");
 195                 argv_array_push(&pack_objects.args, "");
 196         }
 197         argv_array_push(&pack_objects.args, "pack-objects");
 198         argv_array_push(&pack_objects.args, "--revs");
 199         if (pack_data->use_thin_pack)
 200                 argv_array_push(&pack_objects.args, "--thin");
 201
 202         argv_array_push(&pack_objects.args, "--stdout");
 203         if (shallow_nr)
 204                 argv_array_push(&pack_objects.args, "--shallow");
 205         if (!pack_data->no_progress)
 206                 argv_array_push(&pack_objects.args, "--progress");
 207         if (pack_data->use_ofs_delta)
 208                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 209         if (pack_data->use_include_tag)
 210                 argv_array_push(&pack_objects.args, "--include-tag");
 211         if (pack_data->filter_options.choice) {
 212                 const char *spec =
 213                         expand_list_objects_filter_spec(&pack_data->filter_options);
 214                 if (pack_objects.use_shell) {
 215                         struct strbuf buf = STRBUF_INIT;
 216                         sq_quote_buf(&buf, spec);
 217                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 218                         strbuf_release(&buf);
 219                 } else {
 220                         argv_array_pushf(&pack_objects.args, "--filter=%s",
 221                                          spec);
 222                 }
 223         }
 224
 225         pack_objects.in = -1;
 226         pack_objects.out = -1;
 227         pack_objects.err = -1;
 228
 229         if (start_command(&pack_objects))
 230                 die("git upload-pack: unable to fork git-pack-objects");
 231
 232         pipe_fd = xfdopen(pack_objects.in, "w");
 233
 234         if (shallow_nr)
 235                 for_each_commit_graft(write_one_shallow, pipe_fd);
 236
 237         for (i = 0; i < pack_data->want_obj.nr; i++)
 238                 fprintf(pipe_fd, "%s\n",
 239                         oid_to_hex(&pack_data->want_obj.objects[i].item->oid));
 240         fprintf(pipe_fd, "--not\n");
 241         for (i = 0; i < pack_data->have_obj.nr; i++)
 242                 fprintf(pipe_fd, "%s\n",
 243                         oid_to_hex(&pack_data->have_obj.objects[i].item->oid));
 244         for (i = 0; i < extra_edge_obj.nr; i++)
 245                 fprintf(pipe_fd, "%s\n",
 246                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 247         fprintf(pipe_fd, "\n");
 248         fflush(pipe_fd);
 249         fclose(pipe_fd);
 250
 251         /* We read from pack_objects.err to capture stderr output for
 252          * progress bar, and pack_objects.out to capture the pack data.
 253          */
 254
 255         while (1) {
 256                 struct pollfd pfd[2];
 257                 int pe, pu, pollsize, polltimeout;
 258                 int ret;
 259
 260                 reset_timeout(pack_data->timeout);
 261
 262                 pollsize = 0;
 263                 pe = pu = -1;
 264
 265                 if (0 <= pack_objects.out) {
 266                         pfd[pollsize].fd = pack_objects.out;
 267                         pfd[pollsize].events = POLLIN;
 268                         pu = pollsize;
 269                         pollsize++;
 270                 }
 271                 if (0 <= pack_objects.err) {
 272                         pfd[pollsize].fd = pack_objects.err;
 273                         pfd[pollsize].events = POLLIN;
 274                         pe = pollsize;
 275                         pollsize++;
 276                 }
 277
 278                 if (!pollsize)
 279                         break;
 280
 281                 polltimeout = pack_data->keepalive < 0
 282                         ? -1
 283                         : 1000 * pack_data->keepalive;
 284
 285                 ret = poll(pfd, pollsize, polltimeout);
 286
 287                 if (ret < 0) {
 288                         if (errno != EINTR) {
 289                                 error_errno("poll failed, resuming");
 290                                 sleep(1);
 291                         }
 292                         continue;
 293                 }
 294                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 295                         /* Status ready; we ship that in the side-band
 296                          * or dump to the standard error.
 297                          */
 298                         sz = xread(pack_objects.err, progress,
 299                                   sizeof(progress));
 300                         if (0 < sz)
 301                                 send_client_data(2, progress, sz,
 302                                                  pack_data->use_sideband);
 303                         else if (sz == 0) {
 304                                 close(pack_objects.err);
 305                                 pack_objects.err = -1;
 306                         }
 307                         else
 308                                 goto fail;
 309                         /* give priority to status messages */
 310                         continue;
 311                 }
 312                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 313                         /* Data ready; we keep the last byte to ourselves
 314                          * in case we detect broken rev-list, so that we
 315                          * can leave the stream corrupted.  This is
 316                          * unfortunate -- unpack-objects would happily
 317                          * accept a valid packdata with trailing garbage,
 318                          * so appending garbage after we pass all the
 319                          * pack data is not good enough to signal
 320                          * breakage to downstream.
 321                          */
 322                         char *cp = data;
 323                         ssize_t outsz = 0;
 324                         if (0 <= buffered) {
 325                                 *cp++ = buffered;
 326                                 outsz++;
 327                         }
 328                         sz = xread(pack_objects.out, cp,
 329                                   sizeof(data) - outsz);
 330                         if (0 < sz)
 331                                 ;
 332                         else if (sz == 0) {
 333                                 close(pack_objects.out);
 334                                 pack_objects.out = -1;
 335                         }
 336                         else
 337                                 goto fail;
 338                         sz += outsz;
 339                         if (1 < sz) {
 340                                 buffered = data[sz-1] & 0xFF;
 341                                 sz--;
 342                         }
 343                         else
 344                                 buffered = -1;
 345                         send_client_data(1, data, sz,
 346                                          pack_data->use_sideband);
 347                 }
 348
 349                 /*
 350                  * We hit the keepalive timeout without saying anything; send
 351                  * an empty message on the data sideband just to let the other
 352                  * side know we're still working on it, but don't have any data
 353                  * yet.
 354                  *
 355                  * If we don't have a sideband channel, there's no room in the
 356                  * protocol to say anything, so those clients are just out of
 357                  * luck.
 358                  */
 359                 if (!ret && pack_data->use_sideband) {
 360                         static const char buf[] = "0005\1";
 361                         write_or_die(1, buf, 5);
 362                 }
 363         }
 364
 365         if (finish_command(&pack_objects)) {
 366                 error("git upload-pack: git-pack-objects died with error.");
 367                 goto fail;
 368         }
 369
 370         /* flush the data */
 371         if (0 <= buffered) {
 372                 data[0] = buffered;
 373                 send_client_data(1, data, 1,
 374                                  pack_data->use_sideband);
 375                 fprintf(stderr, "flushed.\n");
 376         }
 377         if (pack_data->use_sideband)
 378                 packet_flush(1);
 379         return;
 380
 381  fail:
 382         send_client_data(3, abort_msg, sizeof(abort_msg),
 383                          pack_data->use_sideband);
 384         die("git upload-pack: %s", abort_msg);
 385 }
 386
 387 static int got_oid(const char *hex, struct object_id *oid,
 388                    struct object_array *have_obj)
 389 {
 390         struct object *o;
 391         int we_knew_they_have = 0;
 392
 393         if (get_oid_hex(hex, oid))
 394                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 395         if (!has_object_file(oid))
 396                 return -1;
 397
 398         o = parse_object(the_repository, oid);
 399         if (!o)
 400                 die("oops (%s)", oid_to_hex(oid));
 401         if (o->type == OBJ_COMMIT) {
 402                 struct commit_list *parents;
 403                 struct commit *commit = (struct commit *)o;
 404                 if (o->flags & THEY_HAVE)
 405                         we_knew_they_have = 1;
 406                 else
 407                         o->flags |= THEY_HAVE;
 408                 if (!oldest_have || (commit->date < oldest_have))
 409                         oldest_have = commit->date;
 410                 for (parents = commit->parents;
 411                      parents;
 412                      parents = parents->next)
 413                         parents->item->object.flags |= THEY_HAVE;
 414         }
 415         if (!we_knew_they_have) {
 416                 add_object_array(o, NULL, have_obj);
 417                 return 1;
 418         }
 419         return 0;
 420 }
 421
 422 static int ok_to_give_up(const struct object_array *have_obj,
 423                          struct object_array *want_obj)
 424 {
 425         uint32_t min_generation = GENERATION_NUMBER_ZERO;
 426
 427         if (!have_obj->nr)
 428                 return 0;
 429
 430         return can_all_from_reach_with_flag(want_obj, THEY_HAVE,
 431                                             COMMON_KNOWN, oldest_have,
 432                                             min_generation);
 433 }
 434
 435 static int get_common_commits(struct upload_pack_data *data,
 436                               struct packet_reader *reader)
 437 {
 438         struct object_id oid;
 439         char last_hex[GIT_MAX_HEXSZ + 1];
 440         int got_common = 0;
 441         int got_other = 0;
 442         int sent_ready = 0;
 443
 444         save_commit_buffer = 0;
 445
 446         for (;;) {
 447                 const char *arg;
 448
 449                 reset_timeout(data->timeout);
 450
 451                 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
 452                         if (data->multi_ack == MULTI_ACK_DETAILED
 453                             && got_common
 454                             && !got_other
 455                             && ok_to_give_up(&data->have_obj, &data->want_obj)) {
 456                                 sent_ready = 1;
 457                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 458                         }
 459                         if (data->have_obj.nr == 0 || data->multi_ack)
 460                                 packet_write_fmt(1, "NAK\n");
 461
 462                         if (data->no_done && sent_ready) {
 463                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 464                                 return 0;
 465                         }
 466                         if (data->stateless_rpc)
 467                                 exit(0);
 468                         got_common = 0;
 469                         got_other = 0;
 470                         continue;
 471                 }
 472                 if (skip_prefix(reader->line, "have ", &arg)) {
 473                         switch (got_oid(arg, &oid, &data->have_obj)) {
 474                         case -1: /* they have what we do not */
 475                                 got_other = 1;
 476                                 if (data->multi_ack
 477                                     && ok_to_give_up(&data->have_obj, &data->want_obj)) {
 478                                         const char *hex = oid_to_hex(&oid);
 479                                         if (data->multi_ack == MULTI_ACK_DETAILED) {
 480                                                 sent_ready = 1;
 481                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 482                                         } else
 483                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 484                                 }
 485                                 break;
 486                         default:
 487                                 got_common = 1;
 488                                 oid_to_hex_r(last_hex, &oid);
 489                                 if (data->multi_ack == MULTI_ACK_DETAILED)
 490                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 491                                 else if (data->multi_ack)
 492                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 493                                 else if (data->have_obj.nr == 1)
 494                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 495                                 break;
 496                         }
 497                         continue;
 498                 }
 499                 if (!strcmp(reader->line, "done")) {
 500                         if (data->have_obj.nr > 0) {
 501                                 if (data->multi_ack)
 502                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 503                                 return 0;
 504                         }
 505                         packet_write_fmt(1, "NAK\n");
 506                         return -1;
 507                 }
 508                 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
 509         }
 510 }
 511
 512 static int is_our_ref(struct object *o)
 513 {
 514         int allow_hidden_ref = (allow_unadvertised_object_request &
 515                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 516         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 517 }
 518
 519 /*
 520  * on successful case, it's up to the caller to close cmd->out
 521  */
 522 static int do_reachable_revlist(struct child_process *cmd,
 523                                 struct object_array *src,
 524                                 struct object_array *reachable)
 525 {
 526         static const char *argv[] = {
 527                 "rev-list", "--stdin", NULL,
 528         };
 529         struct object *o;
 530         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 531         int i;
 532         const unsigned hexsz = the_hash_algo->hexsz;
 533
 534         cmd->argv = argv;
 535         cmd->git_cmd = 1;
 536         cmd->no_stderr = 1;
 537         cmd->in = -1;
 538         cmd->out = -1;
 539
 540         /*
 541          * If the next rev-list --stdin encounters an unknown commit,
 542          * it terminates, which will cause SIGPIPE in the write loop
 543          * below.
 544          */
 545         sigchain_push(SIGPIPE, SIG_IGN);
 546
 547         if (start_command(cmd))
 548                 goto error;
 549
 550         namebuf[0] = '^';
 551         namebuf[hexsz + 1] = '\n';
 552         for (i = get_max_object_index(); 0 < i; ) {
 553                 o = get_indexed_object(--i);
 554                 if (!o)
 555                         continue;
 556                 if (reachable && o->type == OBJ_COMMIT)
 557                         o->flags &= ~TMP_MARK;
 558                 if (!is_our_ref(o))
 559                         continue;
 560                 memcpy(namebuf + 1, oid_to_hex(&o->oid), hexsz);
 561                 if (write_in_full(cmd->in, namebuf, hexsz + 2) < 0)
 562                         goto error;
 563         }
 564         namebuf[hexsz] = '\n';
 565         for (i = 0; i < src->nr; i++) {
 566                 o = src->objects[i].item;
 567                 if (is_our_ref(o)) {
 568                         if (reachable)
 569                                 add_object_array(o, NULL, reachable);
 570                         continue;
 571                 }
 572                 if (reachable && o->type == OBJ_COMMIT)
 573                         o->flags |= TMP_MARK;
 574                 memcpy(namebuf, oid_to_hex(&o->oid), hexsz);
 575                 if (write_in_full(cmd->in, namebuf, hexsz + 1) < 0)
 576                         goto error;
 577         }
 578         close(cmd->in);
 579         cmd->in = -1;
 580         sigchain_pop(SIGPIPE);
 581
 582         return 0;
 583
 584 error:
 585         sigchain_pop(SIGPIPE);
 586
 587         if (cmd->in >= 0)
 588                 close(cmd->in);
 589         if (cmd->out >= 0)
 590                 close(cmd->out);
 591         return -1;
 592 }
 593
 594 static int get_reachable_list(struct object_array *src,
 595                               struct object_array *reachable)
 596 {
 597         struct child_process cmd = CHILD_PROCESS_INIT;
 598         int i;
 599         struct object *o;
 600         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 601         const unsigned hexsz = the_hash_algo->hexsz;
 602
 603         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 604                 return -1;
 605
 606         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 607                 struct object_id oid;
 608                 const char *p;
 609
 610                 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
 611                         break;
 612
 613                 o = lookup_object(the_repository, &oid);
 614                 if (o && o->type == OBJ_COMMIT) {
 615                         o->flags &= ~TMP_MARK;
 616                 }
 617         }
 618         for (i = get_max_object_index(); 0 < i; i--) {
 619                 o = get_indexed_object(i - 1);
 620                 if (o && o->type == OBJ_COMMIT &&
 621                     (o->flags & TMP_MARK)) {
 622                         add_object_array(o, NULL, reachable);
 623                                 o->flags &= ~TMP_MARK;
 624                 }
 625         }
 626         close(cmd.out);
 627
 628         if (finish_command(&cmd))
 629                 return -1;
 630
 631         return 0;
 632 }
 633
 634 static int has_unreachable(struct object_array *src)
 635 {
 636         struct child_process cmd = CHILD_PROCESS_INIT;
 637         char buf[1];
 638         int i;
 639
 640         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 641                 return 1;
 642
 643         /*
 644          * The commits out of the rev-list are not ancestors of
 645          * our ref.
 646          */
 647         i = read_in_full(cmd.out, buf, 1);
 648         if (i)
 649                 goto error;
 650         close(cmd.out);
 651         cmd.out = -1;
 652
 653         /*
 654          * rev-list may have died by encountering a bad commit
 655          * in the history, in which case we do want to bail out
 656          * even when it showed no commit.
 657          */
 658         if (finish_command(&cmd))
 659                 goto error;
 660
 661         /* All the non-tip ones are ancestors of what we advertised */
 662         return 0;
 663
 664 error:
 665         sigchain_pop(SIGPIPE);
 666         if (cmd.out >= 0)
 667                 close(cmd.out);
 668         return 1;
 669 }
 670
 671 static void check_non_tip(struct upload_pack_data *data)
 672 {
 673         int i;
 674
 675         /*
 676          * In the normal in-process case without
 677          * uploadpack.allowReachableSHA1InWant,
 678          * non-tip requests can never happen.
 679          */
 680         if (!data->stateless_rpc
 681             && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 682                 goto error;
 683         if (!has_unreachable(&data->want_obj))
 684                 /* All the non-tip ones are ancestors of what we advertised */
 685                 return;
 686
 687 error:
 688         /* Pick one of them (we know there at least is one) */
 689         for (i = 0; i < data->want_obj.nr; i++) {
 690                 struct object *o = data->want_obj.objects[i].item;
 691                 if (!is_our_ref(o)) {
 692                         packet_writer_error(&data->writer,
 693                                             "upload-pack: not our ref %s",
 694                                             oid_to_hex(&o->oid));
 695                         die("git upload-pack: not our ref %s",
 696                             oid_to_hex(&o->oid));
 697                 }
 698         }
 699 }
 700
 701 static void send_shallow(struct packet_writer *writer,
 702                          struct commit_list *result)
 703 {
 704         while (result) {
 705                 struct object *object = &result->item->object;
 706                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 707                         packet_writer_write(writer, "shallow %s",
 708                                             oid_to_hex(&object->oid));
 709                         register_shallow(the_repository, &object->oid);
 710                         shallow_nr++;
 711                 }
 712                 result = result->next;
 713         }
 714 }
 715
 716 static void send_unshallow(struct packet_writer *writer,
 717                            const struct object_array *shallows,
 718                            struct object_array *want_obj)
 719 {
 720         int i;
 721
 722         for (i = 0; i < shallows->nr; i++) {
 723                 struct object *object = shallows->objects[i].item;
 724                 if (object->flags & NOT_SHALLOW) {
 725                         struct commit_list *parents;
 726                         packet_writer_write(writer, "unshallow %s",
 727                                             oid_to_hex(&object->oid));
 728                         object->flags &= ~CLIENT_SHALLOW;
 729                         /*
 730                          * We want to _register_ "object" as shallow, but we
 731                          * also need to traverse object's parents to deepen a
 732                          * shallow clone. Unregister it for now so we can
 733                          * parse and add the parents to the want list, then
 734                          * re-register it.
 735                          */
 736                         unregister_shallow(&object->oid);
 737                         object->parsed = 0;
 738                         parse_commit_or_die((struct commit *)object);
 739                         parents = ((struct commit *)object)->parents;
 740                         while (parents) {
 741                                 add_object_array(&parents->item->object,
 742                                                  NULL, want_obj);
 743                                 parents = parents->next;
 744                         }
 745                         add_object_array(object, NULL, &extra_edge_obj);
 746                 }
 747                 /* make sure commit traversal conforms to client */
 748                 register_shallow(the_repository, &object->oid);
 749         }
 750 }
 751
 752 static int check_ref(const char *refname_full, const struct object_id *oid,
 753                      int flag, void *cb_data);
 754 static void deepen(struct packet_writer *writer, int depth, int deepen_relative,
 755                    struct object_array *shallows, struct object_array *want_obj)
 756 {
 757         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 758                 int i;
 759
 760                 for (i = 0; i < shallows->nr; i++) {
 761                         struct object *object = shallows->objects[i].item;
 762                         object->flags |= NOT_SHALLOW;
 763                 }
 764         } else if (deepen_relative) {
 765                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 766                 struct commit_list *result;
 767
 768                 /*
 769                  * Checking for reachable shallows requires that our refs be
 770                  * marked with OUR_REF.
 771                  */
 772                 head_ref_namespaced(check_ref, NULL);
 773                 for_each_namespaced_ref(check_ref, NULL);
 774
 775                 get_reachable_list(shallows, &reachable_shallows);
 776                 result = get_shallow_commits(&reachable_shallows,
 777                                              depth + 1,
 778                                              SHALLOW, NOT_SHALLOW);
 779                 send_shallow(writer, result);
 780                 free_commit_list(result);
 781                 object_array_clear(&reachable_shallows);
 782         } else {
 783                 struct commit_list *result;
 784
 785                 result = get_shallow_commits(want_obj, depth,
 786                                              SHALLOW, NOT_SHALLOW);
 787                 send_shallow(writer, result);
 788                 free_commit_list(result);
 789         }
 790
 791         send_unshallow(writer, shallows, want_obj);
 792 }
 793
 794 static void deepen_by_rev_list(struct packet_writer *writer, int ac,
 795                                const char **av,
 796                                struct object_array *shallows,
 797                                struct object_array *want_obj)
 798 {
 799         struct commit_list *result;
 800
 801         disable_commit_graph(the_repository);
 802         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 803         send_shallow(writer, result);
 804         free_commit_list(result);
 805         send_unshallow(writer, shallows, want_obj);
 806 }
 807
 808 /* Returns 1 if a shallow list is sent or 0 otherwise */
 809 static int send_shallow_list(struct packet_writer *writer,
 810                              int depth, int deepen_rev_list,
 811                              timestamp_t deepen_since,
 812                              struct string_list *deepen_not,
 813                              int deepen_relative,
 814                              struct object_array *shallows,
 815                              struct object_array *want_obj)
 816 {
 817         int ret = 0;
 818
 819         if (depth > 0 && deepen_rev_list)
 820                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 821         if (depth > 0) {
 822                 deepen(writer, depth, deepen_relative, shallows, want_obj);
 823                 ret = 1;
 824         } else if (deepen_rev_list) {
 825                 struct argv_array av = ARGV_ARRAY_INIT;
 826                 int i;
 827
 828                 argv_array_push(&av, "rev-list");
 829                 if (deepen_since)
 830                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 831                 if (deepen_not->nr) {
 832                         argv_array_push(&av, "--not");
 833                         for (i = 0; i < deepen_not->nr; i++) {
 834                                 struct string_list_item *s = deepen_not->items + i;
 835                                 argv_array_push(&av, s->string);
 836                         }
 837                         argv_array_push(&av, "--not");
 838                 }
 839                 for (i = 0; i < want_obj->nr; i++) {
 840                         struct object *o = want_obj->objects[i].item;
 841                         argv_array_push(&av, oid_to_hex(&o->oid));
 842                 }
 843                 deepen_by_rev_list(writer, av.argc, av.argv, shallows, want_obj);
 844                 argv_array_clear(&av);
 845                 ret = 1;
 846         } else {
 847                 if (shallows->nr > 0) {
 848                         int i;
 849                         for (i = 0; i < shallows->nr; i++)
 850                                 register_shallow(the_repository,
 851                                                  &shallows->objects[i].item->oid);
 852                 }
 853         }
 854
 855         shallow_nr += shallows->nr;
 856         return ret;
 857 }
 858
 859 static int process_shallow(const char *line, struct object_array *shallows)
 860 {
 861         const char *arg;
 862         if (skip_prefix(line, "shallow ", &arg)) {
 863                 struct object_id oid;
 864                 struct object *object;
 865                 if (get_oid_hex(arg, &oid))
 866                         die("invalid shallow line: %s", line);
 867                 object = parse_object(the_repository, &oid);
 868                 if (!object)
 869                         return 1;
 870                 if (object->type != OBJ_COMMIT)
 871                         die("invalid shallow object %s", oid_to_hex(&oid));
 872                 if (!(object->flags & CLIENT_SHALLOW)) {
 873                         object->flags |= CLIENT_SHALLOW;
 874                         add_object_array(object, NULL, shallows);
 875                 }
 876                 return 1;
 877         }
 878
 879         return 0;
 880 }
 881
 882 static int process_deepen(const char *line, int *depth)
 883 {
 884         const char *arg;
 885         if (skip_prefix(line, "deepen ", &arg)) {
 886                 char *end = NULL;
 887                 *depth = (int)strtol(arg, &end, 0);
 888                 if (!end || *end || *depth <= 0)
 889                         die("Invalid deepen: %s", line);
 890                 return 1;
 891         }
 892
 893         return 0;
 894 }
 895
 896 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 897 {
 898         const char *arg;
 899         if (skip_prefix(line, "deepen-since ", &arg)) {
 900                 char *end = NULL;
 901                 *deepen_since = parse_timestamp(arg, &end, 0);
 902                 if (!end || *end || !deepen_since ||
 903                     /* revisions.c's max_age -1 is special */
 904                     *deepen_since == -1)
 905                         die("Invalid deepen-since: %s", line);
 906                 *deepen_rev_list = 1;
 907                 return 1;
 908         }
 909         return 0;
 910 }
 911
 912 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 913 {
 914         const char *arg;
 915         if (skip_prefix(line, "deepen-not ", &arg)) {
 916                 char *ref = NULL;
 917                 struct object_id oid;
 918                 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
 919                         die("git upload-pack: ambiguous deepen-not: %s", line);
 920                 string_list_append(deepen_not, ref);
 921                 free(ref);
 922                 *deepen_rev_list = 1;
 923                 return 1;
 924         }
 925         return 0;
 926 }
 927
 928 static void receive_needs(struct upload_pack_data *data,
 929                           struct packet_reader *reader)
 930 {
 931         int has_non_tip = 0;
 932
 933         shallow_nr = 0;
 934         for (;;) {
 935                 struct object *o;
 936                 const char *features;
 937                 struct object_id oid_buf;
 938                 const char *arg;
 939
 940                 reset_timeout(data->timeout);
 941                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 942                         break;
 943
 944                 if (process_shallow(reader->line, &data->shallows))
 945                         continue;
 946                 if (process_deepen(reader->line, &data->depth))
 947                         continue;
 948                 if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
 949                         continue;
 950                 if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
 951                         continue;
 952
 953                 if (skip_prefix(reader->line, "filter ", &arg)) {
 954                         if (!data->filter_capability_requested)
 955                                 die("git upload-pack: filtering capability not negotiated");
 956                         list_objects_filter_die_if_populated(&data->filter_options);
 957                         parse_list_objects_filter(&data->filter_options, arg);
 958                         continue;
 959                 }
 960
 961                 if (!skip_prefix(reader->line, "want ", &arg) ||
 962                     parse_oid_hex(arg, &oid_buf, &features))
 963                         die("git upload-pack: protocol error, "
 964                             "expected to get object ID, not '%s'", reader->line);
 965
 966                 if (parse_feature_request(features, "deepen-relative"))
 967                         data->deepen_relative = 1;
 968                 if (parse_feature_request(features, "multi_ack_detailed"))
 969                         data->multi_ack = MULTI_ACK_DETAILED;
 970                 else if (parse_feature_request(features, "multi_ack"))
 971                         data->multi_ack = MULTI_ACK;
 972                 if (parse_feature_request(features, "no-done"))
 973                         data->no_done = 1;
 974                 if (parse_feature_request(features, "thin-pack"))
 975                         data->use_thin_pack = 1;
 976                 if (parse_feature_request(features, "ofs-delta"))
 977                         data->use_ofs_delta = 1;
 978                 if (parse_feature_request(features, "side-band-64k"))
 979                         data->use_sideband = LARGE_PACKET_MAX;
 980                 else if (parse_feature_request(features, "side-band"))
 981                         data->use_sideband = DEFAULT_PACKET_MAX;
 982                 if (parse_feature_request(features, "no-progress"))
 983                         data->no_progress = 1;
 984                 if (parse_feature_request(features, "include-tag"))
 985                         data->use_include_tag = 1;
 986                 if (data->allow_filter &&
 987                     parse_feature_request(features, "filter"))
 988                         data->filter_capability_requested = 1;
 989
 990                 o = parse_object(the_repository, &oid_buf);
 991                 if (!o) {
 992                         packet_writer_error(&data->writer,
 993                                             "upload-pack: not our ref %s",
 994                                             oid_to_hex(&oid_buf));
 995                         die("git upload-pack: not our ref %s",
 996                             oid_to_hex(&oid_buf));
 997                 }
 998                 if (!(o->flags & WANTED)) {
 999                         o->flags |= WANTED;
1000                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
1001                               || is_our_ref(o)))
1002                                 has_non_tip = 1;
1003                         add_object_array(o, NULL, &data->want_obj);
1004                 }
1005         }
1006
1007         /*
1008          * We have sent all our refs already, and the other end
1009          * should have chosen out of them. When we are operating
1010          * in the stateless RPC mode, however, their choice may
1011          * have been based on the set of older refs advertised
1012          * by another process that handled the initial request.
1013          */
1014         if (has_non_tip)
1015                 check_non_tip(data);
1016
1017         if (!data->use_sideband && data->daemon_mode)
1018                 data->no_progress = 1;
1019
1020         if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1021                 return;
1022
1023         if (send_shallow_list(&data->writer,
1024                               data->depth,
1025                               data->deepen_rev_list,
1026                               data->deepen_since,
1027                               &data->deepen_not,
1028                               data->deepen_relative,
1029                               &data->shallows,
1030                               &data->want_obj))
1031                 packet_flush(1);
1032 }
1033
1034 /* return non-zero if the ref is hidden, otherwise 0 */
1035 static int mark_our_ref(const char *refname, const char *refname_full,
1036                         const struct object_id *oid)
1037 {
1038         struct object *o = lookup_unknown_object(oid);
1039
1040         if (ref_is_hidden(refname, refname_full)) {
1041                 o->flags |= HIDDEN_REF;
1042                 return 1;
1043         }
1044         o->flags |= OUR_REF;
1045         return 0;
1046 }
1047
1048 static int check_ref(const char *refname_full, const struct object_id *oid,
1049                      int flag, void *cb_data)
1050 {
1051         const char *refname = strip_namespace(refname_full);
1052
1053         mark_our_ref(refname, refname_full, oid);
1054         return 0;
1055 }
1056
1057 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1058 {
1059         struct string_list_item *item;
1060
1061         if (!symref->nr)
1062                 return;
1063         for_each_string_list_item(item, symref)
1064                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1065 }
1066
1067 static int send_ref(const char *refname, const struct object_id *oid,
1068                     int flag, void *cb_data)
1069 {
1070         static const char *capabilities = "multi_ack thin-pack side-band"
1071                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1072                 " deepen-relative no-progress include-tag multi_ack_detailed";
1073         const char *refname_nons = strip_namespace(refname);
1074         struct object_id peeled;
1075         struct upload_pack_data *data = cb_data;
1076
1077         if (mark_our_ref(refname_nons, refname, oid))
1078                 return 0;
1079
1080         if (capabilities) {
1081                 struct strbuf symref_info = STRBUF_INIT;
1082
1083                 format_symref_info(&symref_info, &data->symref);
1084                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
1085                              oid_to_hex(oid), refname_nons,
1086                              0, capabilities,
1087                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
1088                                      " allow-tip-sha1-in-want" : "",
1089                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
1090                                      " allow-reachable-sha1-in-want" : "",
1091                              data->stateless_rpc ? " no-done" : "",
1092                              symref_info.buf,
1093                              data->allow_filter ? " filter" : "",
1094                              git_user_agent_sanitized());
1095                 strbuf_release(&symref_info);
1096         } else {
1097                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1098         }
1099         capabilities = NULL;
1100         if (!peel_ref(refname, &peeled))
1101                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1102         return 0;
1103 }
1104
1105 static int find_symref(const char *refname, const struct object_id *oid,
1106                        int flag, void *cb_data)
1107 {
1108         const char *symref_target;
1109         struct string_list_item *item;
1110
1111         if ((flag & REF_ISSYMREF) == 0)
1112                 return 0;
1113         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1114         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1115                 die("'%s' is a symref but it is not?", refname);
1116         item = string_list_append(cb_data, strip_namespace(refname));
1117         item->util = xstrdup(strip_namespace(symref_target));
1118         return 0;
1119 }
1120
1121 static int upload_pack_config(const char *var, const char *value, void *cb_data)
1122 {
1123         struct upload_pack_data *data = cb_data;
1124
1125         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1126                 if (git_config_bool(var, value))
1127                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1128                 else
1129                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1130         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1131                 if (git_config_bool(var, value))
1132                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1133                 else
1134                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1135         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1136                 if (git_config_bool(var, value))
1137                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1138                 else
1139                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1140         } else if (!strcmp("uploadpack.keepalive", var)) {
1141                 data->keepalive = git_config_int(var, value);
1142                 if (!data->keepalive)
1143                         data->keepalive = -1;
1144         } else if (!strcmp("uploadpack.allowfilter", var)) {
1145                 data->allow_filter = git_config_bool(var, value);
1146         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1147                 data->allow_ref_in_want = git_config_bool(var, value);
1148         } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1149                 allow_sideband_all = git_config_bool(var, value);
1150         } else if (!strcmp("core.precomposeunicode", var)) {
1151                 precomposed_unicode = git_config_bool(var, value);
1152         }
1153
1154         if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
1155         current_config_scope() != CONFIG_SCOPE_WORKTREE) {
1156                 if (!strcmp("uploadpack.packobjectshook", var))
1157                         return git_config_string(&pack_objects_hook, var, value);
1158         }
1159
1160         return parse_hide_refs_config(var, value, "uploadpack");
1161 }
1162
1163 void upload_pack(struct upload_pack_options *options)
1164 {
1165         struct packet_reader reader;
1166         struct upload_pack_data data;
1167
1168         upload_pack_data_init(&data);
1169
1170         git_config(upload_pack_config, &data);
1171
1172         data.stateless_rpc = options->stateless_rpc;
1173         data.daemon_mode = options->daemon_mode;
1174         data.timeout = options->timeout;
1175
1176         head_ref_namespaced(find_symref, &data.symref);
1177
1178         if (options->advertise_refs || !data.stateless_rpc) {
1179                 reset_timeout(data.timeout);
1180                 head_ref_namespaced(send_ref, &data);
1181                 for_each_namespaced_ref(send_ref, &data);
1182                 advertise_shallow_grafts(1);
1183                 packet_flush(1);
1184         } else {
1185                 head_ref_namespaced(check_ref, NULL);
1186                 for_each_namespaced_ref(check_ref, NULL);
1187         }
1188
1189         if (!options->advertise_refs) {
1190                 packet_reader_init(&reader, 0, NULL, 0,
1191                                    PACKET_READ_CHOMP_NEWLINE |
1192                                    PACKET_READ_DIE_ON_ERR_PACKET);
1193
1194                 receive_needs(&data, &reader);
1195                 if (data.want_obj.nr) {
1196                         get_common_commits(&data, &reader);
1197                         create_pack_file(&data);
1198                 }
1199         }
1200
1201         upload_pack_data_clear(&data);
1202 }
1203
1204 static int parse_want(struct packet_writer *writer, const char *line,
1205                       struct object_array *want_obj)
1206 {
1207         const char *arg;
1208         if (skip_prefix(line, "want ", &arg)) {
1209                 struct object_id oid;
1210                 struct object *o;
1211
1212                 if (get_oid_hex(arg, &oid))
1213                         die("git upload-pack: protocol error, "
1214                             "expected to get oid, not '%s'", line);
1215
1216                 o = parse_object(the_repository, &oid);
1217                 if (!o) {
1218                         packet_writer_error(writer,
1219                                             "upload-pack: not our ref %s",
1220                                             oid_to_hex(&oid));
1221                         die("git upload-pack: not our ref %s",
1222                             oid_to_hex(&oid));
1223                 }
1224
1225                 if (!(o->flags & WANTED)) {
1226                         o->flags |= WANTED;
1227                         add_object_array(o, NULL, want_obj);
1228                 }
1229
1230                 return 1;
1231         }
1232
1233         return 0;
1234 }
1235
1236 static int parse_want_ref(struct packet_writer *writer, const char *line,
1237                           struct string_list *wanted_refs,
1238                           struct object_array *want_obj)
1239 {
1240         const char *arg;
1241         if (skip_prefix(line, "want-ref ", &arg)) {
1242                 struct object_id oid;
1243                 struct string_list_item *item;
1244                 struct object *o;
1245
1246                 if (read_ref(arg, &oid)) {
1247                         packet_writer_error(writer, "unknown ref %s", arg);
1248                         die("unknown ref %s", arg);
1249                 }
1250
1251                 item = string_list_append(wanted_refs, arg);
1252                 item->util = oiddup(&oid);
1253
1254                 o = parse_object_or_die(&oid, arg);
1255                 if (!(o->flags & WANTED)) {
1256                         o->flags |= WANTED;
1257                         add_object_array(o, NULL, want_obj);
1258                 }
1259
1260                 return 1;
1261         }
1262
1263         return 0;
1264 }
1265
1266 static int parse_have(const char *line, struct oid_array *haves)
1267 {
1268         const char *arg;
1269         if (skip_prefix(line, "have ", &arg)) {
1270                 struct object_id oid;
1271
1272                 if (get_oid_hex(arg, &oid))
1273                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1274                 oid_array_append(haves, &oid);
1275                 return 1;
1276         }
1277
1278         return 0;
1279 }
1280
1281 static void process_args(struct packet_reader *request,
1282                          struct upload_pack_data *data)
1283 {
1284         while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1285                 const char *arg = request->line;
1286                 const char *p;
1287
1288                 /* process want */
1289                 if (parse_want(&data->writer, arg, &data->want_obj))
1290                         continue;
1291                 if (data->allow_ref_in_want &&
1292                     parse_want_ref(&data->writer, arg, &data->wanted_refs,
1293                                    &data->want_obj))
1294                         continue;
1295                 /* process have line */
1296                 if (parse_have(arg, &data->haves))
1297                         continue;
1298
1299                 /* process args like thin-pack */
1300                 if (!strcmp(arg, "thin-pack")) {
1301                         data->use_thin_pack = 1;
1302                         continue;
1303                 }
1304                 if (!strcmp(arg, "ofs-delta")) {
1305                         data->use_ofs_delta = 1;
1306                         continue;
1307                 }
1308                 if (!strcmp(arg, "no-progress")) {
1309                         data->no_progress = 1;
1310                         continue;
1311                 }
1312                 if (!strcmp(arg, "include-tag")) {
1313                         data->use_include_tag = 1;
1314                         continue;
1315                 }
1316                 if (!strcmp(arg, "done")) {
1317                         data->done = 1;
1318                         continue;
1319                 }
1320
1321                 /* Shallow related arguments */
1322                 if (process_shallow(arg, &data->shallows))
1323                         continue;
1324                 if (process_deepen(arg, &data->depth))
1325                         continue;
1326                 if (process_deepen_since(arg, &data->deepen_since,
1327                                          &data->deepen_rev_list))
1328                         continue;
1329                 if (process_deepen_not(arg, &data->deepen_not,
1330                                        &data->deepen_rev_list))
1331                         continue;
1332                 if (!strcmp(arg, "deepen-relative")) {
1333                         data->deepen_relative = 1;
1334                         continue;
1335                 }
1336
1337                 if (data->allow_filter && skip_prefix(arg, "filter ", &p)) {
1338                         list_objects_filter_die_if_populated(&data->filter_options);
1339                         parse_list_objects_filter(&data->filter_options, p);
1340                         continue;
1341                 }
1342
1343                 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1344                      allow_sideband_all) &&
1345                     !strcmp(arg, "sideband-all")) {
1346                         data->writer.use_sideband = 1;
1347                         continue;
1348                 }
1349
1350                 /* ignore unknown lines maybe? */
1351                 die("unexpected line: '%s'", arg);
1352         }
1353
1354         if (request->status != PACKET_READ_FLUSH)
1355                 die(_("expected flush after fetch arguments"));
1356 }
1357
1358 static int process_haves(struct oid_array *haves, struct oid_array *common,
1359                          struct object_array *have_obj)
1360 {
1361         int i;
1362
1363         /* Process haves */
1364         for (i = 0; i < haves->nr; i++) {
1365                 const struct object_id *oid = &haves->oid[i];
1366                 struct object *o;
1367                 int we_knew_they_have = 0;
1368
1369                 if (!has_object_file(oid))
1370                         continue;
1371
1372                 oid_array_append(common, oid);
1373
1374                 o = parse_object(the_repository, oid);
1375                 if (!o)
1376                         die("oops (%s)", oid_to_hex(oid));
1377                 if (o->type == OBJ_COMMIT) {
1378                         struct commit_list *parents;
1379                         struct commit *commit = (struct commit *)o;
1380                         if (o->flags & THEY_HAVE)
1381                                 we_knew_they_have = 1;
1382                         else
1383                                 o->flags |= THEY_HAVE;
1384                         if (!oldest_have || (commit->date < oldest_have))
1385                                 oldest_have = commit->date;
1386                         for (parents = commit->parents;
1387                              parents;
1388                              parents = parents->next)
1389                                 parents->item->object.flags |= THEY_HAVE;
1390                 }
1391                 if (!we_knew_they_have)
1392                         add_object_array(o, NULL, have_obj);
1393         }
1394
1395         return 0;
1396 }
1397
1398 static int send_acks(struct packet_writer *writer, struct oid_array *acks,
1399                      const struct object_array *have_obj,
1400                      struct object_array *want_obj)
1401 {
1402         int i;
1403
1404         packet_writer_write(writer, "acknowledgments\n");
1405
1406         /* Send Acks */
1407         if (!acks->nr)
1408                 packet_writer_write(writer, "NAK\n");
1409
1410         for (i = 0; i < acks->nr; i++) {
1411                 packet_writer_write(writer, "ACK %s\n",
1412                                     oid_to_hex(&acks->oid[i]));
1413         }
1414
1415         if (ok_to_give_up(have_obj, want_obj)) {
1416                 /* Send Ready */
1417                 packet_writer_write(writer, "ready\n");
1418                 return 1;
1419         }
1420
1421         return 0;
1422 }
1423
1424 static int process_haves_and_send_acks(struct upload_pack_data *data)
1425 {
1426         struct oid_array common = OID_ARRAY_INIT;
1427         int ret = 0;
1428
1429         process_haves(&data->haves, &common, &data->have_obj);
1430         if (data->done) {
1431                 ret = 1;
1432         } else if (send_acks(&data->writer, &common,
1433                              &data->have_obj, &data->want_obj)) {
1434                 packet_writer_delim(&data->writer);
1435                 ret = 1;
1436         } else {
1437                 /* Add Flush */
1438                 packet_writer_flush(&data->writer);
1439                 ret = 0;
1440         }
1441
1442         oid_array_clear(&data->haves);
1443         oid_array_clear(&common);
1444         return ret;
1445 }
1446
1447 static void send_wanted_ref_info(struct upload_pack_data *data)
1448 {
1449         const struct string_list_item *item;
1450
1451         if (!data->wanted_refs.nr)
1452                 return;
1453
1454         packet_writer_write(&data->writer, "wanted-refs\n");
1455
1456         for_each_string_list_item(item, &data->wanted_refs) {
1457                 packet_writer_write(&data->writer, "%s %s\n",
1458                                     oid_to_hex(item->util),
1459                                     item->string);
1460         }
1461
1462         packet_writer_delim(&data->writer);
1463 }
1464
1465 static void send_shallow_info(struct upload_pack_data *data)
1466 {
1467         /* No shallow info needs to be sent */
1468         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1469             !is_repository_shallow(the_repository))
1470                 return;
1471
1472         packet_writer_write(&data->writer, "shallow-info\n");
1473
1474         if (!send_shallow_list(&data->writer, data->depth,
1475                                data->deepen_rev_list,
1476                                data->deepen_since, &data->deepen_not,
1477                                data->deepen_relative,
1478                                &data->shallows, &data->want_obj) &&
1479             is_repository_shallow(the_repository))
1480                 deepen(&data->writer, INFINITE_DEPTH, data->deepen_relative,
1481                        &data->shallows, &data->want_obj);
1482
1483         packet_delim(1);
1484 }
1485
1486 enum fetch_state {
1487         FETCH_PROCESS_ARGS = 0,
1488         FETCH_SEND_ACKS,
1489         FETCH_SEND_PACK,
1490         FETCH_DONE,
1491 };
1492
1493 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1494                    struct packet_reader *request)
1495 {
1496         enum fetch_state state = FETCH_PROCESS_ARGS;
1497         struct upload_pack_data data;
1498
1499         clear_object_flags(ALL_FLAGS);
1500
1501         upload_pack_data_init(&data);
1502         data.use_sideband = LARGE_PACKET_MAX;
1503
1504         git_config(upload_pack_config, &data);
1505
1506         while (state != FETCH_DONE) {
1507                 switch (state) {
1508                 case FETCH_PROCESS_ARGS:
1509                         process_args(request, &data);
1510
1511                         if (!data.want_obj.nr) {
1512                                 /*
1513                                  * Request didn't contain any 'want' lines,
1514                                  * guess they didn't want anything.
1515                                  */
1516                                 state = FETCH_DONE;
1517                         } else if (data.haves.nr) {
1518                                 /*
1519                                  * Request had 'have' lines, so lets ACK them.
1520                                  */
1521                                 state = FETCH_SEND_ACKS;
1522                         } else {
1523                                 /*
1524                                  * Request had 'want's but no 'have's so we can
1525                                  * immedietly go to construct and send a pack.
1526                                  */
1527                                 state = FETCH_SEND_PACK;
1528                         }
1529                         break;
1530                 case FETCH_SEND_ACKS:
1531                         if (process_haves_and_send_acks(&data))
1532                                 state = FETCH_SEND_PACK;
1533                         else
1534                                 state = FETCH_DONE;
1535                         break;
1536                 case FETCH_SEND_PACK:
1537                         send_wanted_ref_info(&data);
1538                         send_shallow_info(&data);
1539
1540                         packet_writer_write(&data.writer, "packfile\n");
1541                         create_pack_file(&data);
1542                         state = FETCH_DONE;
1543                         break;
1544                 case FETCH_DONE:
1545                         continue;
1546                 }
1547         }
1548
1549         upload_pack_data_clear(&data);
1550         return 0;
1551 }
1552
1553 int upload_pack_advertise(struct repository *r,
1554                           struct strbuf *value)
1555 {
1556         if (value) {
1557                 int allow_filter_value;
1558                 int allow_ref_in_want;
1559                 int allow_sideband_all_value;
1560
1561                 strbuf_addstr(value, "shallow");
1562
1563                 if (!repo_config_get_bool(the_repository,
1564                                          "uploadpack.allowfilter",
1565                                          &allow_filter_value) &&
1566                     allow_filter_value)
1567                         strbuf_addstr(value, " filter");
1568
1569                 if (!repo_config_get_bool(the_repository,
1570                                          "uploadpack.allowrefinwant",
1571                                          &allow_ref_in_want) &&
1572                     allow_ref_in_want)
1573                         strbuf_addstr(value, " ref-in-want");
1574
1575                 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1576                     (!repo_config_get_bool(the_repository,
1577                                            "uploadpack.allowsidebandall",
1578                                            &allow_sideband_all_value) &&
1579                      allow_sideband_all_value))
1580                         strbuf_addstr(value, " sideband-all");
1581         }
1582
1583         return 1;
1584 }