remote-curl.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "remote.h"
   4 #include "connect.h"
   5 #include "strbuf.h"
   6 #include "walker.h"
   7 #include "http.h"
   8 #include "exec-cmd.h"
   9 #include "run-command.h"
  10 #include "pkt-line.h"
  11 #include "string-list.h"
  12 #include "sideband.h"
  13 #include "argv-array.h"
  14 #include "credential.h"
  15 #include "sha1-array.h"
  16 #include "send-pack.h"
  17 #include "protocol.h"
  18 #include "quote.h"
  19
  20 static struct remote *remote;
  21 /* always ends with a trailing slash */
  22 static struct strbuf url = STRBUF_INIT;
  23
  24 struct options {
  25         int verbosity;
  26         unsigned long depth;
  27         char *deepen_since;
  28         struct string_list deepen_not;
  29         struct string_list push_options;
  30         char *filter;
  31         unsigned progress : 1,
  32                 check_self_contained_and_connected : 1,
  33                 cloning : 1,
  34                 update_shallow : 1,
  35                 followtags : 1,
  36                 dry_run : 1,
  37                 thin : 1,
  38                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
  39                 push_cert : 2,
  40                 deepen_relative : 1,
  41                 from_promisor : 1,
  42                 no_dependents : 1;
  43 };
  44 static struct options options;
  45 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  46
  47 static int set_option(const char *name, const char *value)
  48 {
  49         if (!strcmp(name, "verbosity")) {
  50                 char *end;
  51                 int v = strtol(value, &end, 10);
  52                 if (value == end || *end)
  53                         return -1;
  54                 options.verbosity = v;
  55                 return 0;
  56         }
  57         else if (!strcmp(name, "progress")) {
  58                 if (!strcmp(value, "true"))
  59                         options.progress = 1;
  60                 else if (!strcmp(value, "false"))
  61                         options.progress = 0;
  62                 else
  63                         return -1;
  64                 return 0;
  65         }
  66         else if (!strcmp(name, "depth")) {
  67                 char *end;
  68                 unsigned long v = strtoul(value, &end, 10);
  69                 if (value == end || *end)
  70                         return -1;
  71                 options.depth = v;
  72                 return 0;
  73         }
  74         else if (!strcmp(name, "deepen-since")) {
  75                 options.deepen_since = xstrdup(value);
  76                 return 0;
  77         }
  78         else if (!strcmp(name, "deepen-not")) {
  79                 string_list_append(&options.deepen_not, value);
  80                 return 0;
  81         }
  82         else if (!strcmp(name, "deepen-relative")) {
  83                 if (!strcmp(value, "true"))
  84                         options.deepen_relative = 1;
  85                 else if (!strcmp(value, "false"))
  86                         options.deepen_relative = 0;
  87                 else
  88                         return -1;
  89                 return 0;
  90         }
  91         else if (!strcmp(name, "followtags")) {
  92                 if (!strcmp(value, "true"))
  93                         options.followtags = 1;
  94                 else if (!strcmp(value, "false"))
  95                         options.followtags = 0;
  96                 else
  97                         return -1;
  98                 return 0;
  99         }
 100         else if (!strcmp(name, "dry-run")) {
 101                 if (!strcmp(value, "true"))
 102                         options.dry_run = 1;
 103                 else if (!strcmp(value, "false"))
 104                         options.dry_run = 0;
 105                 else
 106                         return -1;
 107                 return 0;
 108         }
 109         else if (!strcmp(name, "check-connectivity")) {
 110                 if (!strcmp(value, "true"))
 111                         options.check_self_contained_and_connected = 1;
 112                 else if (!strcmp(value, "false"))
 113                         options.check_self_contained_and_connected = 0;
 114                 else
 115                         return -1;
 116                 return 0;
 117         }
 118         else if (!strcmp(name, "cas")) {
 119                 struct strbuf val = STRBUF_INIT;
 120                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 121                 string_list_append(&cas_options, val.buf);
 122                 strbuf_release(&val);
 123                 return 0;
 124         } else if (!strcmp(name, "cloning")) {
 125                 if (!strcmp(value, "true"))
 126                         options.cloning = 1;
 127                 else if (!strcmp(value, "false"))
 128                         options.cloning = 0;
 129                 else
 130                         return -1;
 131                 return 0;
 132         } else if (!strcmp(name, "update-shallow")) {
 133                 if (!strcmp(value, "true"))
 134                         options.update_shallow = 1;
 135                 else if (!strcmp(value, "false"))
 136                         options.update_shallow = 0;
 137                 else
 138                         return -1;
 139                 return 0;
 140         } else if (!strcmp(name, "pushcert")) {
 141                 if (!strcmp(value, "true"))
 142                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 143                 else if (!strcmp(value, "false"))
 144                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 145                 else if (!strcmp(value, "if-asked"))
 146                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 147                 else
 148                         return -1;
 149                 return 0;
 150         } else if (!strcmp(name, "push-option")) {
 151                 if (*value != '"')
 152                         string_list_append(&options.push_options, value);
 153                 else {
 154                         struct strbuf unquoted = STRBUF_INIT;
 155                         if (unquote_c_style(&unquoted, value, NULL) < 0)
 156                                 die("invalid quoting in push-option value");
 157                         string_list_append_nodup(&options.push_options,
 158                                                  strbuf_detach(&unquoted, NULL));
 159                 }
 160                 return 0;
 161
 162 #if LIBCURL_VERSION_NUM >= 0x070a08
 163         } else if (!strcmp(name, "family")) {
 164                 if (!strcmp(value, "ipv4"))
 165                         git_curl_ipresolve = CURL_IPRESOLVE_V4;
 166                 else if (!strcmp(value, "ipv6"))
 167                         git_curl_ipresolve = CURL_IPRESOLVE_V6;
 168                 else if (!strcmp(value, "all"))
 169                         git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 170                 else
 171                         return -1;
 172                 return 0;
 173 #endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 174         } else if (!strcmp(name, "from-promisor")) {
 175                 options.from_promisor = 1;
 176                 return 0;
 177         } else if (!strcmp(name, "no-dependents")) {
 178                 options.no_dependents = 1;
 179                 return 0;
 180         } else if (!strcmp(name, "filter")) {
 181                 options.filter = xstrdup(value);
 182                 return 0;
 183         } else {
 184                 return 1 /* unsupported */;
 185         }
 186 }
 187
 188 struct discovery {
 189         char *service;
 190         char *buf_alloc;
 191         char *buf;
 192         size_t len;
 193         struct ref *refs;
 194         struct oid_array shallow;
 195         enum protocol_version version;
 196         unsigned proto_git : 1;
 197 };
 198 static struct discovery *last_discovery;
 199
 200 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 201 {
 202         struct ref *list = NULL;
 203         struct packet_reader reader;
 204
 205         packet_reader_init(&reader, -1, heads->buf, heads->len,
 206                            PACKET_READ_CHOMP_NEWLINE |
 207                            PACKET_READ_GENTLE_ON_EOF |
 208                            PACKET_READ_DIE_ON_ERR_PACKET);
 209
 210         heads->version = discover_version(&reader);
 211         switch (heads->version) {
 212         case protocol_v2:
 213                 /*
 214                  * Do nothing.  This isn't a list of refs but rather a
 215                  * capability advertisement.  Client would have run
 216                  * 'stateless-connect' so we'll dump this capability listing
 217                  * and let them request the refs themselves.
 218                  */
 219                 break;
 220         case protocol_v1:
 221         case protocol_v0:
 222                 get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
 223                                  NULL, &heads->shallow);
 224                 break;
 225         case protocol_unknown_version:
 226                 BUG("unknown protocol version");
 227         }
 228
 229         return list;
 230 }
 231
 232 static struct ref *parse_info_refs(struct discovery *heads)
 233 {
 234         char *data, *start, *mid;
 235         char *ref_name;
 236         int i = 0;
 237
 238         struct ref *refs = NULL;
 239         struct ref *ref = NULL;
 240         struct ref *last_ref = NULL;
 241
 242         data = heads->buf;
 243         start = NULL;
 244         mid = data;
 245         while (i < heads->len) {
 246                 if (!start) {
 247                         start = &data[i];
 248                 }
 249                 if (data[i] == '\t')
 250                         mid = &data[i];
 251                 if (data[i] == '\n') {
 252                         if (mid - start != 40)
 253                                 die("%sinfo/refs not valid: is this a git repository?",
 254                                     url.buf);
 255                         data[i] = 0;
 256                         ref_name = mid + 1;
 257                         ref = alloc_ref(ref_name);
 258                         get_oid_hex(start, &ref->old_oid);
 259                         if (!refs)
 260                                 refs = ref;
 261                         if (last_ref)
 262                                 last_ref->next = ref;
 263                         last_ref = ref;
 264                         start = NULL;
 265                 }
 266                 i++;
 267         }
 268
 269         ref = alloc_ref("HEAD");
 270         if (!http_fetch_ref(url.buf, ref) &&
 271             !resolve_remote_symref(ref, refs)) {
 272                 ref->next = refs;
 273                 refs = ref;
 274         } else {
 275                 free(ref);
 276         }
 277
 278         return refs;
 279 }
 280
 281 static void free_discovery(struct discovery *d)
 282 {
 283         if (d) {
 284                 if (d == last_discovery)
 285                         last_discovery = NULL;
 286                 free(d->shallow.oid);
 287                 free(d->buf_alloc);
 288                 free_refs(d->refs);
 289                 free(d->service);
 290                 free(d);
 291         }
 292 }
 293
 294 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 295                              struct strbuf *msg)
 296 {
 297         const char *p, *eol;
 298
 299         /*
 300          * We only show text/plain parts, as other types are likely
 301          * to be ugly to look at on the user's terminal.
 302          */
 303         if (strcmp(type->buf, "text/plain"))
 304                 return -1;
 305         if (charset->len)
 306                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 307
 308         strbuf_trim(msg);
 309         if (!msg->len)
 310                 return -1;
 311
 312         p = msg->buf;
 313         do {
 314                 eol = strchrnul(p, '\n');
 315                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 316                 p = eol + 1;
 317         } while(*eol);
 318         return 0;
 319 }
 320
 321 static int get_protocol_http_header(enum protocol_version version,
 322                                     struct strbuf *header)
 323 {
 324         if (version > 0) {
 325                 strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
 326                             version);
 327
 328                 return 1;
 329         }
 330
 331         return 0;
 332 }
 333
 334 static void check_smart_http(struct discovery *d, const char *service,
 335                              struct strbuf *type)
 336 {
 337         const char *p;
 338         struct packet_reader reader;
 339
 340         /*
 341          * If we don't see x-$service-advertisement, then it's not smart-http.
 342          * But once we do, we commit to it and assume any other protocol
 343          * violations are hard errors.
 344          */
 345         if (!skip_prefix(type->buf, "application/x-", &p) ||
 346             !skip_prefix(p, service, &p) ||
 347             strcmp(p, "-advertisement"))
 348                 return;
 349
 350         packet_reader_init(&reader, -1, d->buf, d->len,
 351                            PACKET_READ_CHOMP_NEWLINE |
 352                            PACKET_READ_DIE_ON_ERR_PACKET);
 353         if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
 354                 die("invalid server response; expected service, got flush packet");
 355
 356         if (skip_prefix(reader.line, "# service=", &p) && !strcmp(p, service)) {
 357                 /*
 358                  * The header can include additional metadata lines, up
 359                  * until a packet flush marker.  Ignore these now, but
 360                  * in the future we might start to scan them.
 361                  */
 362                 for (;;) {
 363                         packet_reader_read(&reader);
 364                         if (reader.pktlen <= 0) {
 365                                 break;
 366                         }
 367                 }
 368
 369                 /*
 370                  * v0 smart http; callers expect us to soak up the
 371                  * service and header packets
 372                  */
 373                 d->buf = reader.src_buffer;
 374                 d->len = reader.src_len;
 375                 d->proto_git = 1;
 376
 377         } else if (!strcmp(reader.line, "version 2")) {
 378                 /*
 379                  * v2 smart http; do not consume version packet, which will
 380                  * be handled elsewhere.
 381                  */
 382                 d->proto_git = 1;
 383
 384         } else {
 385                 die("invalid server response; got '%s'", reader.line);
 386         }
 387 }
 388
 389 static struct discovery *discover_refs(const char *service, int for_push)
 390 {
 391         struct strbuf type = STRBUF_INIT;
 392         struct strbuf charset = STRBUF_INIT;
 393         struct strbuf buffer = STRBUF_INIT;
 394         struct strbuf refs_url = STRBUF_INIT;
 395         struct strbuf effective_url = STRBUF_INIT;
 396         struct strbuf protocol_header = STRBUF_INIT;
 397         struct string_list extra_headers = STRING_LIST_INIT_DUP;
 398         struct discovery *last = last_discovery;
 399         int http_ret, maybe_smart = 0;
 400         struct http_get_options http_options;
 401         enum protocol_version version = get_protocol_version_config();
 402
 403         if (last && !strcmp(service, last->service))
 404                 return last;
 405         free_discovery(last);
 406
 407         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 408         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 409              git_env_bool("GIT_SMART_HTTP", 1)) {
 410                 maybe_smart = 1;
 411                 if (!strchr(url.buf, '?'))
 412                         strbuf_addch(&refs_url, '?');
 413                 else
 414                         strbuf_addch(&refs_url, '&');
 415                 strbuf_addf(&refs_url, "service=%s", service);
 416         }
 417
 418         /*
 419          * NEEDSWORK: If we are trying to use protocol v2 and we are planning
 420          * to perform a push, then fallback to v0 since the client doesn't know
 421          * how to push yet using v2.
 422          */
 423         if (version == protocol_v2 && !strcmp("git-receive-pack", service))
 424                 version = protocol_v0;
 425
 426         /* Add the extra Git-Protocol header */
 427         if (get_protocol_http_header(version, &protocol_header))
 428                 string_list_append(&extra_headers, protocol_header.buf);
 429
 430         memset(&http_options, 0, sizeof(http_options));
 431         http_options.content_type = &type;
 432         http_options.charset = &charset;
 433         http_options.effective_url = &effective_url;
 434         http_options.base_url = &url;
 435         http_options.extra_headers = &extra_headers;
 436         http_options.initial_request = 1;
 437         http_options.no_cache = 1;
 438
 439         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 440         switch (http_ret) {
 441         case HTTP_OK:
 442                 break;
 443         case HTTP_MISSING_TARGET:
 444                 show_http_message(&type, &charset, &buffer);
 445                 die("repository '%s' not found", url.buf);
 446         case HTTP_NOAUTH:
 447                 show_http_message(&type, &charset, &buffer);
 448                 die("Authentication failed for '%s'", url.buf);
 449         default:
 450                 show_http_message(&type, &charset, &buffer);
 451                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 452         }
 453
 454         if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 455                 warning(_("redirecting to %s"), url.buf);
 456
 457         last= xcalloc(1, sizeof(*last_discovery));
 458         last->service = xstrdup(service);
 459         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 460         last->buf = last->buf_alloc;
 461
 462         if (maybe_smart)
 463                 check_smart_http(last, service, &type);
 464
 465         if (last->proto_git)
 466                 last->refs = parse_git_refs(last, for_push);
 467         else
 468                 last->refs = parse_info_refs(last);
 469
 470         strbuf_release(&refs_url);
 471         strbuf_release(&type);
 472         strbuf_release(&charset);
 473         strbuf_release(&effective_url);
 474         strbuf_release(&buffer);
 475         strbuf_release(&protocol_header);
 476         string_list_clear(&extra_headers, 0);
 477         last_discovery = last;
 478         return last;
 479 }
 480
 481 static struct ref *get_refs(int for_push)
 482 {
 483         struct discovery *heads;
 484
 485         if (for_push)
 486                 heads = discover_refs("git-receive-pack", for_push);
 487         else
 488                 heads = discover_refs("git-upload-pack", for_push);
 489
 490         return heads->refs;
 491 }
 492
 493 static void output_refs(struct ref *refs)
 494 {
 495         struct ref *posn;
 496         for (posn = refs; posn; posn = posn->next) {
 497                 if (posn->symref)
 498                         printf("@%s %s\n", posn->symref, posn->name);
 499                 else
 500                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 501         }
 502         printf("\n");
 503         fflush(stdout);
 504 }
 505
 506 struct rpc_state {
 507         const char *service_name;
 508         const char **argv;
 509         struct strbuf *stdin_preamble;
 510         char *service_url;
 511         char *hdr_content_type;
 512         char *hdr_accept;
 513         char *protocol_header;
 514         char *buf;
 515         size_t alloc;
 516         size_t len;
 517         size_t pos;
 518         int in;
 519         int out;
 520         int any_written;
 521         struct strbuf result;
 522         unsigned gzip_request : 1;
 523         unsigned initial_buffer : 1;
 524 };
 525
 526 static size_t rpc_out(void *ptr, size_t eltsize,
 527                 size_t nmemb, void *buffer_)
 528 {
 529         size_t max = eltsize * nmemb;
 530         struct rpc_state *rpc = buffer_;
 531         size_t avail = rpc->len - rpc->pos;
 532
 533         if (!avail) {
 534                 rpc->initial_buffer = 0;
 535                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 536                 if (!avail)
 537                         return 0;
 538                 rpc->pos = 0;
 539                 rpc->len = avail;
 540         }
 541
 542         if (max < avail)
 543                 avail = max;
 544         memcpy(ptr, rpc->buf + rpc->pos, avail);
 545         rpc->pos += avail;
 546         return avail;
 547 }
 548
 549 #ifndef NO_CURL_IOCTL
 550 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 551 {
 552         struct rpc_state *rpc = clientp;
 553
 554         switch (cmd) {
 555         case CURLIOCMD_NOP:
 556                 return CURLIOE_OK;
 557
 558         case CURLIOCMD_RESTARTREAD:
 559                 if (rpc->initial_buffer) {
 560                         rpc->pos = 0;
 561                         return CURLIOE_OK;
 562                 }
 563                 error("unable to rewind rpc post data - try increasing http.postBuffer");
 564                 return CURLIOE_FAILRESTART;
 565
 566         default:
 567                 return CURLIOE_UNKNOWNCMD;
 568         }
 569 }
 570 #endif
 571
 572 struct rpc_in_data {
 573         struct rpc_state *rpc;
 574         struct active_request_slot *slot;
 575 };
 576
 577 /*
 578  * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
 579  * from ptr.
 580  */
 581 static size_t rpc_in(char *ptr, size_t eltsize,
 582                 size_t nmemb, void *buffer_)
 583 {
 584         size_t size = eltsize * nmemb;
 585         struct rpc_in_data *data = buffer_;
 586         long response_code;
 587
 588         if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
 589                               &response_code) != CURLE_OK)
 590                 return size;
 591         if (response_code >= 300)
 592                 return size;
 593         if (size)
 594                 data->rpc->any_written = 1;
 595         write_or_die(data->rpc->in, ptr, size);
 596         return size;
 597 }
 598
 599 static int run_slot(struct active_request_slot *slot,
 600                     struct slot_results *results)
 601 {
 602         int err;
 603         struct slot_results results_buf;
 604
 605         if (!results)
 606                 results = &results_buf;
 607
 608         err = run_one_slot(slot, results);
 609
 610         if (err != HTTP_OK && err != HTTP_REAUTH) {
 611                 struct strbuf msg = STRBUF_INIT;
 612                 if (results->http_code && results->http_code != 200)
 613                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 614                 if (results->curl_result != CURLE_OK) {
 615                         if (msg.len)
 616                                 strbuf_addch(&msg, ' ');
 617                         strbuf_addf(&msg, "curl %d", results->curl_result);
 618                         if (curl_errorstr[0]) {
 619                                 strbuf_addch(&msg, ' ');
 620                                 strbuf_addstr(&msg, curl_errorstr);
 621                         }
 622                 }
 623                 error("RPC failed; %s", msg.buf);
 624                 strbuf_release(&msg);
 625         }
 626
 627         return err;
 628 }
 629
 630 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 631 {
 632         struct active_request_slot *slot;
 633         struct curl_slist *headers = http_copy_default_headers();
 634         struct strbuf buf = STRBUF_INIT;
 635         int err;
 636
 637         slot = get_active_slot();
 638
 639         headers = curl_slist_append(headers, rpc->hdr_content_type);
 640         headers = curl_slist_append(headers, rpc->hdr_accept);
 641
 642         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 643         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 644         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 645         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 646         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 647         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 648         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 649         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 650         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 651
 652         err = run_slot(slot, results);
 653
 654         curl_slist_free_all(headers);
 655         strbuf_release(&buf);
 656         return err;
 657 }
 658
 659 static curl_off_t xcurl_off_t(size_t len)
 660 {
 661         uintmax_t size = len;
 662         if (size > maximum_signed_value_of_type(curl_off_t))
 663                 die("cannot handle pushes this big");
 664         return (curl_off_t)size;
 665 }
 666
 667 static int post_rpc(struct rpc_state *rpc)
 668 {
 669         struct active_request_slot *slot;
 670         struct curl_slist *headers = http_copy_default_headers();
 671         int use_gzip = rpc->gzip_request;
 672         char *gzip_body = NULL;
 673         size_t gzip_size = 0;
 674         int err, large_request = 0;
 675         int needs_100_continue = 0;
 676         struct rpc_in_data rpc_in_data;
 677
 678         /* Try to load the entire request, if we can fit it into the
 679          * allocated buffer space we can use HTTP/1.0 and avoid the
 680          * chunked encoding mess.
 681          */
 682         while (1) {
 683                 size_t left = rpc->alloc - rpc->len;
 684                 char *buf = rpc->buf + rpc->len;
 685                 int n;
 686
 687                 if (left < LARGE_PACKET_MAX) {
 688                         large_request = 1;
 689                         use_gzip = 0;
 690                         break;
 691                 }
 692
 693                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 694                 if (!n)
 695                         break;
 696                 rpc->len += n;
 697         }
 698
 699         if (large_request) {
 700                 struct slot_results results;
 701
 702                 do {
 703                         err = probe_rpc(rpc, &results);
 704                         if (err == HTTP_REAUTH)
 705                                 credential_fill(&http_auth);
 706                 } while (err == HTTP_REAUTH);
 707                 if (err != HTTP_OK)
 708                         return -1;
 709
 710                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 711                         needs_100_continue = 1;
 712         }
 713
 714         headers = curl_slist_append(headers, rpc->hdr_content_type);
 715         headers = curl_slist_append(headers, rpc->hdr_accept);
 716         headers = curl_slist_append(headers, needs_100_continue ?
 717                 "Expect: 100-continue" : "Expect:");
 718
 719         /* Add the extra Git-Protocol header */
 720         if (rpc->protocol_header)
 721                 headers = curl_slist_append(headers, rpc->protocol_header);
 722
 723 retry:
 724         slot = get_active_slot();
 725
 726         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 727         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 728         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 729         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 730
 731         if (large_request) {
 732                 /* The request body is large and the size cannot be predicted.
 733                  * We must use chunked encoding to send it.
 734                  */
 735                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 736                 rpc->initial_buffer = 1;
 737                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 738                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 739 #ifndef NO_CURL_IOCTL
 740                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 741                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 742 #endif
 743                 if (options.verbosity > 1) {
 744                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 745                         fflush(stderr);
 746                 }
 747
 748         } else if (gzip_body) {
 749                 /*
 750                  * If we are looping to retry authentication, then the previous
 751                  * run will have set up the headers and gzip buffer already,
 752                  * and we just need to send it.
 753                  */
 754                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 755                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 756
 757         } else if (use_gzip && 1024 < rpc->len) {
 758                 /* The client backend isn't giving us compressed data so
 759                  * we can try to deflate it ourselves, this may save on
 760                  * the transfer time.
 761                  */
 762                 git_zstream stream;
 763                 int ret;
 764
 765                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 766                 gzip_size = git_deflate_bound(&stream, rpc->len);
 767                 gzip_body = xmalloc(gzip_size);
 768
 769                 stream.next_in = (unsigned char *)rpc->buf;
 770                 stream.avail_in = rpc->len;
 771                 stream.next_out = (unsigned char *)gzip_body;
 772                 stream.avail_out = gzip_size;
 773
 774                 ret = git_deflate(&stream, Z_FINISH);
 775                 if (ret != Z_STREAM_END)
 776                         die("cannot deflate request; zlib deflate error %d", ret);
 777
 778                 ret = git_deflate_end_gently(&stream);
 779                 if (ret != Z_OK)
 780                         die("cannot deflate request; zlib end error %d", ret);
 781
 782                 gzip_size = stream.total_out;
 783
 784                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 785                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 786                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 787
 788                 if (options.verbosity > 1) {
 789                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 790                                 rpc->service_name,
 791                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 792                         fflush(stderr);
 793                 }
 794         } else {
 795                 /* We know the complete request size in advance, use the
 796                  * more normal Content-Length approach.
 797                  */
 798                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 799                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 800                 if (options.verbosity > 1) {
 801                         fprintf(stderr, "POST %s (%lu bytes)\n",
 802                                 rpc->service_name, (unsigned long)rpc->len);
 803                         fflush(stderr);
 804                 }
 805         }
 806
 807         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 808         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 809         rpc_in_data.rpc = rpc;
 810         rpc_in_data.slot = slot;
 811         curl_easy_setopt(slot->curl, CURLOPT_FILE, &rpc_in_data);
 812         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
 813
 814
 815         rpc->any_written = 0;
 816         err = run_slot(slot, NULL);
 817         if (err == HTTP_REAUTH && !large_request) {
 818                 credential_fill(&http_auth);
 819                 goto retry;
 820         }
 821         if (err != HTTP_OK)
 822                 err = -1;
 823
 824         if (!rpc->any_written)
 825                 err = -1;
 826
 827         curl_slist_free_all(headers);
 828         free(gzip_body);
 829         return err;
 830 }
 831
 832 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 833 {
 834         const char *svc = rpc->service_name;
 835         struct strbuf buf = STRBUF_INIT;
 836         struct strbuf *preamble = rpc->stdin_preamble;
 837         struct child_process client = CHILD_PROCESS_INIT;
 838         int err = 0;
 839
 840         client.in = -1;
 841         client.out = -1;
 842         client.git_cmd = 1;
 843         client.argv = rpc->argv;
 844         if (start_command(&client))
 845                 exit(1);
 846         if (preamble)
 847                 write_or_die(client.in, preamble->buf, preamble->len);
 848         if (heads)
 849                 write_or_die(client.in, heads->buf, heads->len);
 850
 851         rpc->alloc = http_post_buffer;
 852         rpc->buf = xmalloc(rpc->alloc);
 853         rpc->in = client.in;
 854         rpc->out = client.out;
 855         strbuf_init(&rpc->result, 0);
 856
 857         strbuf_addf(&buf, "%s%s", url.buf, svc);
 858         rpc->service_url = strbuf_detach(&buf, NULL);
 859
 860         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 861         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 862
 863         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 864         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 865
 866         if (get_protocol_http_header(heads->version, &buf))
 867                 rpc->protocol_header = strbuf_detach(&buf, NULL);
 868         else
 869                 rpc->protocol_header = NULL;
 870
 871         while (!err) {
 872                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 873                 if (!n)
 874                         break;
 875                 rpc->pos = 0;
 876                 rpc->len = n;
 877                 err |= post_rpc(rpc);
 878         }
 879
 880         close(client.in);
 881         client.in = -1;
 882         if (!err) {
 883                 strbuf_read(&rpc->result, client.out, 0);
 884         } else {
 885                 char buf[4096];
 886                 for (;;)
 887                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 888                                 break;
 889         }
 890
 891         close(client.out);
 892         client.out = -1;
 893
 894         err |= finish_command(&client);
 895         free(rpc->service_url);
 896         free(rpc->hdr_content_type);
 897         free(rpc->hdr_accept);
 898         free(rpc->protocol_header);
 899         free(rpc->buf);
 900         strbuf_release(&buf);
 901         return err;
 902 }
 903
 904 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 905 {
 906         struct walker *walker;
 907         char **targets;
 908         int ret, i;
 909
 910         ALLOC_ARRAY(targets, nr_heads);
 911         if (options.depth || options.deepen_since)
 912                 die("dumb http transport does not support shallow capabilities");
 913         for (i = 0; i < nr_heads; i++)
 914                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 915
 916         walker = get_http_walker(url.buf);
 917         walker->get_verbosely = options.verbosity >= 3;
 918         walker->get_recover = 0;
 919         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 920         walker_free(walker);
 921
 922         for (i = 0; i < nr_heads; i++)
 923                 free(targets[i]);
 924         free(targets);
 925
 926         return ret ? error("fetch failed.") : 0;
 927 }
 928
 929 static int fetch_git(struct discovery *heads,
 930         int nr_heads, struct ref **to_fetch)
 931 {
 932         struct rpc_state rpc;
 933         struct strbuf preamble = STRBUF_INIT;
 934         int i, err;
 935         struct argv_array args = ARGV_ARRAY_INIT;
 936
 937         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 938                          "--stdin", "--lock-pack", NULL);
 939         if (options.followtags)
 940                 argv_array_push(&args, "--include-tag");
 941         if (options.thin)
 942                 argv_array_push(&args, "--thin");
 943         if (options.verbosity >= 3)
 944                 argv_array_pushl(&args, "-v", "-v", NULL);
 945         if (options.check_self_contained_and_connected)
 946                 argv_array_push(&args, "--check-self-contained-and-connected");
 947         if (options.cloning)
 948                 argv_array_push(&args, "--cloning");
 949         if (options.update_shallow)
 950                 argv_array_push(&args, "--update-shallow");
 951         if (!options.progress)
 952                 argv_array_push(&args, "--no-progress");
 953         if (options.depth)
 954                 argv_array_pushf(&args, "--depth=%lu", options.depth);
 955         if (options.deepen_since)
 956                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 957         for (i = 0; i < options.deepen_not.nr; i++)
 958                 argv_array_pushf(&args, "--shallow-exclude=%s",
 959                                  options.deepen_not.items[i].string);
 960         if (options.deepen_relative && options.depth)
 961                 argv_array_push(&args, "--deepen-relative");
 962         if (options.from_promisor)
 963                 argv_array_push(&args, "--from-promisor");
 964         if (options.no_dependents)
 965                 argv_array_push(&args, "--no-dependents");
 966         if (options.filter)
 967                 argv_array_pushf(&args, "--filter=%s", options.filter);
 968         argv_array_push(&args, url.buf);
 969
 970         for (i = 0; i < nr_heads; i++) {
 971                 struct ref *ref = to_fetch[i];
 972                 if (!*ref->name)
 973                         die("cannot fetch by sha1 over smart http");
 974                 packet_buf_write(&preamble, "%s %s\n",
 975                                  oid_to_hex(&ref->old_oid), ref->name);
 976         }
 977         packet_buf_flush(&preamble);
 978
 979         memset(&rpc, 0, sizeof(rpc));
 980         rpc.service_name = "git-upload-pack",
 981         rpc.argv = args.argv;
 982         rpc.stdin_preamble = &preamble;
 983         rpc.gzip_request = 1;
 984
 985         err = rpc_service(&rpc, heads);
 986         if (rpc.result.len)
 987                 write_or_die(1, rpc.result.buf, rpc.result.len);
 988         strbuf_release(&rpc.result);
 989         strbuf_release(&preamble);
 990         argv_array_clear(&args);
 991         return err;
 992 }
 993
 994 static int fetch(int nr_heads, struct ref **to_fetch)
 995 {
 996         struct discovery *d = discover_refs("git-upload-pack", 0);
 997         if (d->proto_git)
 998                 return fetch_git(d, nr_heads, to_fetch);
 999         else
1000                 return fetch_dumb(nr_heads, to_fetch);
1001 }
1002
1003 static void parse_fetch(struct strbuf *buf)
1004 {
1005         struct ref **to_fetch = NULL;
1006         struct ref *list_head = NULL;
1007         struct ref **list = &list_head;
1008         int alloc_heads = 0, nr_heads = 0;
1009
1010         do {
1011                 const char *p;
1012                 if (skip_prefix(buf->buf, "fetch ", &p)) {
1013                         const char *name;
1014                         struct ref *ref;
1015                         struct object_id old_oid;
1016
1017                         if (get_oid_hex(p, &old_oid))
1018                                 die("protocol error: expected sha/ref, got %s'", p);
1019                         if (p[GIT_SHA1_HEXSZ] == ' ')
1020                                 name = p + GIT_SHA1_HEXSZ + 1;
1021                         else if (!p[GIT_SHA1_HEXSZ])
1022                                 name = "";
1023                         else
1024                                 die("protocol error: expected sha/ref, got %s'", p);
1025
1026                         ref = alloc_ref(name);
1027                         oidcpy(&ref->old_oid, &old_oid);
1028
1029                         *list = ref;
1030                         list = &ref->next;
1031
1032                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1033                         to_fetch[nr_heads++] = ref;
1034                 }
1035                 else
1036                         die("http transport does not support %s", buf->buf);
1037
1038                 strbuf_reset(buf);
1039                 if (strbuf_getline_lf(buf, stdin) == EOF)
1040                         return;
1041                 if (!*buf->buf)
1042                         break;
1043         } while (1);
1044
1045         if (fetch(nr_heads, to_fetch))
1046                 exit(128); /* error already reported */
1047         free_refs(list_head);
1048         free(to_fetch);
1049
1050         printf("\n");
1051         fflush(stdout);
1052         strbuf_reset(buf);
1053 }
1054
1055 static int push_dav(int nr_spec, char **specs)
1056 {
1057         struct child_process child = CHILD_PROCESS_INIT;
1058         size_t i;
1059
1060         child.git_cmd = 1;
1061         argv_array_push(&child.args, "http-push");
1062         argv_array_push(&child.args, "--helper-status");
1063         if (options.dry_run)
1064                 argv_array_push(&child.args, "--dry-run");
1065         if (options.verbosity > 1)
1066                 argv_array_push(&child.args, "--verbose");
1067         argv_array_push(&child.args, url.buf);
1068         for (i = 0; i < nr_spec; i++)
1069                 argv_array_push(&child.args, specs[i]);
1070
1071         if (run_command(&child))
1072                 die("git-http-push failed");
1073         return 0;
1074 }
1075
1076 static int push_git(struct discovery *heads, int nr_spec, char **specs)
1077 {
1078         struct rpc_state rpc;
1079         int i, err;
1080         struct argv_array args;
1081         struct string_list_item *cas_option;
1082         struct strbuf preamble = STRBUF_INIT;
1083
1084         argv_array_init(&args);
1085         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1086                          NULL);
1087
1088         if (options.thin)
1089                 argv_array_push(&args, "--thin");
1090         if (options.dry_run)
1091                 argv_array_push(&args, "--dry-run");
1092         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1093                 argv_array_push(&args, "--signed=yes");
1094         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1095                 argv_array_push(&args, "--signed=if-asked");
1096         if (options.verbosity == 0)
1097                 argv_array_push(&args, "--quiet");
1098         else if (options.verbosity > 1)
1099                 argv_array_push(&args, "--verbose");
1100         for (i = 0; i < options.push_options.nr; i++)
1101                 argv_array_pushf(&args, "--push-option=%s",
1102                                  options.push_options.items[i].string);
1103         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1104         for_each_string_list_item(cas_option, &cas_options)
1105                 argv_array_push(&args, cas_option->string);
1106         argv_array_push(&args, url.buf);
1107
1108         argv_array_push(&args, "--stdin");
1109         for (i = 0; i < nr_spec; i++)
1110                 packet_buf_write(&preamble, "%s\n", specs[i]);
1111         packet_buf_flush(&preamble);
1112
1113         memset(&rpc, 0, sizeof(rpc));
1114         rpc.service_name = "git-receive-pack",
1115         rpc.argv = args.argv;
1116         rpc.stdin_preamble = &preamble;
1117
1118         err = rpc_service(&rpc, heads);
1119         if (rpc.result.len)
1120                 write_or_die(1, rpc.result.buf, rpc.result.len);
1121         strbuf_release(&rpc.result);
1122         strbuf_release(&preamble);
1123         argv_array_clear(&args);
1124         return err;
1125 }
1126
1127 static int push(int nr_spec, char **specs)
1128 {
1129         struct discovery *heads = discover_refs("git-receive-pack", 1);
1130         int ret;
1131
1132         if (heads->proto_git)
1133                 ret = push_git(heads, nr_spec, specs);
1134         else
1135                 ret = push_dav(nr_spec, specs);
1136         free_discovery(heads);
1137         return ret;
1138 }
1139
1140 static void parse_push(struct strbuf *buf)
1141 {
1142         char **specs = NULL;
1143         int alloc_spec = 0, nr_spec = 0, i, ret;
1144
1145         do {
1146                 if (starts_with(buf->buf, "push ")) {
1147                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1148                         specs[nr_spec++] = xstrdup(buf->buf + 5);
1149                 }
1150                 else
1151                         die("http transport does not support %s", buf->buf);
1152
1153                 strbuf_reset(buf);
1154                 if (strbuf_getline_lf(buf, stdin) == EOF)
1155                         goto free_specs;
1156                 if (!*buf->buf)
1157                         break;
1158         } while (1);
1159
1160         ret = push(nr_spec, specs);
1161         printf("\n");
1162         fflush(stdout);
1163
1164         if (ret)
1165                 exit(128); /* error already reported */
1166
1167  free_specs:
1168         for (i = 0; i < nr_spec; i++)
1169                 free(specs[i]);
1170         free(specs);
1171 }
1172
1173 /*
1174  * Used to represent the state of a connection to an HTTP server when
1175  * communicating using git's wire-protocol version 2.
1176  */
1177 struct proxy_state {
1178         char *service_name;
1179         char *service_url;
1180         struct curl_slist *headers;
1181         struct strbuf request_buffer;
1182         int in;
1183         int out;
1184         struct packet_reader reader;
1185         size_t pos;
1186         int seen_flush;
1187 };
1188
1189 static void proxy_state_init(struct proxy_state *p, const char *service_name,
1190                              enum protocol_version version)
1191 {
1192         struct strbuf buf = STRBUF_INIT;
1193
1194         memset(p, 0, sizeof(*p));
1195         p->service_name = xstrdup(service_name);
1196
1197         p->in = 0;
1198         p->out = 1;
1199         strbuf_init(&p->request_buffer, 0);
1200
1201         strbuf_addf(&buf, "%s%s", url.buf, p->service_name);
1202         p->service_url = strbuf_detach(&buf, NULL);
1203
1204         p->headers = http_copy_default_headers();
1205
1206         strbuf_addf(&buf, "Content-Type: application/x-%s-request", p->service_name);
1207         p->headers = curl_slist_append(p->headers, buf.buf);
1208         strbuf_reset(&buf);
1209
1210         strbuf_addf(&buf, "Accept: application/x-%s-result", p->service_name);
1211         p->headers = curl_slist_append(p->headers, buf.buf);
1212         strbuf_reset(&buf);
1213
1214         p->headers = curl_slist_append(p->headers, "Transfer-Encoding: chunked");
1215
1216         /* Add the Git-Protocol header */
1217         if (get_protocol_http_header(version, &buf))
1218                 p->headers = curl_slist_append(p->headers, buf.buf);
1219
1220         packet_reader_init(&p->reader, p->in, NULL, 0,
1221                            PACKET_READ_GENTLE_ON_EOF |
1222                            PACKET_READ_DIE_ON_ERR_PACKET);
1223
1224         strbuf_release(&buf);
1225 }
1226
1227 static void proxy_state_clear(struct proxy_state *p)
1228 {
1229         free(p->service_name);
1230         free(p->service_url);
1231         curl_slist_free_all(p->headers);
1232         strbuf_release(&p->request_buffer);
1233 }
1234
1235 /*
1236  * CURLOPT_READFUNCTION callback function.
1237  * Attempts to copy over a single packet-line at a time into the
1238  * curl provided buffer.
1239  */
1240 static size_t proxy_in(char *buffer, size_t eltsize,
1241                        size_t nmemb, void *userdata)
1242 {
1243         size_t max;
1244         struct proxy_state *p = userdata;
1245         size_t avail = p->request_buffer.len - p->pos;
1246
1247
1248         if (eltsize != 1)
1249                 BUG("curl read callback called with size = %"PRIuMAX" != 1",
1250                     (uintmax_t)eltsize);
1251         max = nmemb;
1252
1253         if (!avail) {
1254                 if (p->seen_flush) {
1255                         p->seen_flush = 0;
1256                         return 0;
1257                 }
1258
1259                 strbuf_reset(&p->request_buffer);
1260                 switch (packet_reader_read(&p->reader)) {
1261                 case PACKET_READ_EOF:
1262                         die("unexpected EOF when reading from parent process");
1263                 case PACKET_READ_NORMAL:
1264                         packet_buf_write_len(&p->request_buffer, p->reader.line,
1265                                              p->reader.pktlen);
1266                         break;
1267                 case PACKET_READ_DELIM:
1268                         packet_buf_delim(&p->request_buffer);
1269                         break;
1270                 case PACKET_READ_FLUSH:
1271                         packet_buf_flush(&p->request_buffer);
1272                         p->seen_flush = 1;
1273                         break;
1274                 }
1275                 p->pos = 0;
1276                 avail = p->request_buffer.len;
1277         }
1278
1279         if (max < avail)
1280                 avail = max;
1281         memcpy(buffer, p->request_buffer.buf + p->pos, avail);
1282         p->pos += avail;
1283         return avail;
1284 }
1285
1286 static size_t proxy_out(char *buffer, size_t eltsize,
1287                         size_t nmemb, void *userdata)
1288 {
1289         size_t size;
1290         struct proxy_state *p = userdata;
1291
1292         if (eltsize != 1)
1293                 BUG("curl read callback called with size = %"PRIuMAX" != 1",
1294                     (uintmax_t)eltsize);
1295         size = nmemb;
1296
1297         write_or_die(p->out, buffer, size);
1298         return size;
1299 }
1300
1301 /* Issues a request to the HTTP server configured in `p` */
1302 static int proxy_request(struct proxy_state *p)
1303 {
1304         struct active_request_slot *slot;
1305
1306         slot = get_active_slot();
1307
1308         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1309         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1310         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
1311         curl_easy_setopt(slot->curl, CURLOPT_URL, p->service_url);
1312         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, p->headers);
1313
1314         /* Setup function to read request from client */
1315         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, proxy_in);
1316         curl_easy_setopt(slot->curl, CURLOPT_READDATA, p);
1317
1318         /* Setup function to write server response to client */
1319         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, proxy_out);
1320         curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, p);
1321
1322         if (run_slot(slot, NULL) != HTTP_OK)
1323                 return -1;
1324
1325         return 0;
1326 }
1327
1328 static int stateless_connect(const char *service_name)
1329 {
1330         struct discovery *discover;
1331         struct proxy_state p;
1332
1333         /*
1334          * Run the info/refs request and see if the server supports protocol
1335          * v2.  If and only if the server supports v2 can we successfully
1336          * establish a stateless connection, otherwise we need to tell the
1337          * client to fallback to using other transport helper functions to
1338          * complete their request.
1339          */
1340         discover = discover_refs(service_name, 0);
1341         if (discover->version != protocol_v2) {
1342                 printf("fallback\n");
1343                 fflush(stdout);
1344                 return -1;
1345         } else {
1346                 /* Stateless Connection established */
1347                 printf("\n");
1348                 fflush(stdout);
1349         }
1350
1351         proxy_state_init(&p, service_name, discover->version);
1352
1353         /*
1354          * Dump the capability listing that we got from the server earlier
1355          * during the info/refs request.
1356          */
1357         write_or_die(p.out, discover->buf, discover->len);
1358
1359         /* Peek the next packet line.  Until we see EOF keep sending POSTs */
1360         while (packet_reader_peek(&p.reader) != PACKET_READ_EOF) {
1361                 if (proxy_request(&p)) {
1362                         /* We would have an err here */
1363                         break;
1364                 }
1365         }
1366
1367         proxy_state_clear(&p);
1368         return 0;
1369 }
1370
1371 int cmd_main(int argc, const char **argv)
1372 {
1373         struct strbuf buf = STRBUF_INIT;
1374         int nongit;
1375
1376         setup_git_directory_gently(&nongit);
1377         if (argc < 2) {
1378                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
1379                 return 1;
1380         }
1381
1382         options.verbosity = 1;
1383         options.progress = !!isatty(2);
1384         options.thin = 1;
1385         string_list_init(&options.deepen_not, 1);
1386         string_list_init(&options.push_options, 1);
1387
1388         remote = remote_get(argv[1]);
1389
1390         if (argc > 2) {
1391                 end_url_with_slash(&url, argv[2]);
1392         } else {
1393                 end_url_with_slash(&url, remote->url[0]);
1394         }
1395
1396         http_init(remote, url.buf, 0);
1397
1398         do {
1399                 const char *arg;
1400
1401                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1402                         if (ferror(stdin))
1403                                 error("remote-curl: error reading command stream from git");
1404                         return 1;
1405                 }
1406                 if (buf.len == 0)
1407                         break;
1408                 if (starts_with(buf.buf, "fetch ")) {
1409                         if (nongit)
1410                                 die("remote-curl: fetch attempted without a local repo");
1411                         parse_fetch(&buf);
1412
1413                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1414                         int for_push = !!strstr(buf.buf + 4, "for-push");
1415                         output_refs(get_refs(for_push));
1416
1417                 } else if (starts_with(buf.buf, "push ")) {
1418                         parse_push(&buf);
1419
1420                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1421                         char *value = strchr(arg, ' ');
1422                         int result;
1423
1424                         if (value)
1425                                 *value++ = '\0';
1426                         else
1427                                 value = "true";
1428
1429                         result = set_option(arg, value);
1430                         if (!result)
1431                                 printf("ok\n");
1432                         else if (result < 0)
1433                                 printf("error invalid value\n");
1434                         else
1435                                 printf("unsupported\n");
1436                         fflush(stdout);
1437
1438                 } else if (!strcmp(buf.buf, "capabilities")) {
1439                         printf("stateless-connect\n");
1440                         printf("fetch\n");
1441                         printf("option\n");
1442                         printf("push\n");
1443                         printf("check-connectivity\n");
1444                         printf("\n");
1445                         fflush(stdout);
1446                 } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1447                         if (!stateless_connect(arg))
1448                                 break;
1449                 } else {
1450                         error("remote-curl: unknown command '%s' from git", buf.buf);
1451                         return 1;
1452                 }
1453                 strbuf_reset(&buf);
1454         } while (1);
1455
1456         http_cleanup();
1457
1458         return 0;
1459 }