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         char *service_url;
 509         char *hdr_content_type;
 510         char *hdr_accept;
 511         char *protocol_header;
 512         char *buf;
 513         size_t alloc;
 514         size_t len;
 515         size_t pos;
 516         int in;
 517         int out;
 518         int any_written;
 519         struct strbuf result;
 520         unsigned gzip_request : 1;
 521         unsigned initial_buffer : 1;
 522 };
 523
 524 static size_t rpc_out(void *ptr, size_t eltsize,
 525                 size_t nmemb, void *buffer_)
 526 {
 527         size_t max = eltsize * nmemb;
 528         struct rpc_state *rpc = buffer_;
 529         size_t avail = rpc->len - rpc->pos;
 530
 531         if (!avail) {
 532                 rpc->initial_buffer = 0;
 533                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 534                 if (!avail)
 535                         return 0;
 536                 rpc->pos = 0;
 537                 rpc->len = avail;
 538         }
 539
 540         if (max < avail)
 541                 avail = max;
 542         memcpy(ptr, rpc->buf + rpc->pos, avail);
 543         rpc->pos += avail;
 544         return avail;
 545 }
 546
 547 #ifndef NO_CURL_IOCTL
 548 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 549 {
 550         struct rpc_state *rpc = clientp;
 551
 552         switch (cmd) {
 553         case CURLIOCMD_NOP:
 554                 return CURLIOE_OK;
 555
 556         case CURLIOCMD_RESTARTREAD:
 557                 if (rpc->initial_buffer) {
 558                         rpc->pos = 0;
 559                         return CURLIOE_OK;
 560                 }
 561                 error("unable to rewind rpc post data - try increasing http.postBuffer");
 562                 return CURLIOE_FAILRESTART;
 563
 564         default:
 565                 return CURLIOE_UNKNOWNCMD;
 566         }
 567 }
 568 #endif
 569
 570 struct rpc_in_data {
 571         struct rpc_state *rpc;
 572         struct active_request_slot *slot;
 573 };
 574
 575 /*
 576  * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
 577  * from ptr.
 578  */
 579 static size_t rpc_in(char *ptr, size_t eltsize,
 580                 size_t nmemb, void *buffer_)
 581 {
 582         size_t size = eltsize * nmemb;
 583         struct rpc_in_data *data = buffer_;
 584         long response_code;
 585
 586         if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
 587                               &response_code) != CURLE_OK)
 588                 return size;
 589         if (response_code >= 300)
 590                 return size;
 591         if (size)
 592                 data->rpc->any_written = 1;
 593         write_or_die(data->rpc->in, ptr, size);
 594         return size;
 595 }
 596
 597 static int run_slot(struct active_request_slot *slot,
 598                     struct slot_results *results)
 599 {
 600         int err;
 601         struct slot_results results_buf;
 602
 603         if (!results)
 604                 results = &results_buf;
 605
 606         err = run_one_slot(slot, results);
 607
 608         if (err != HTTP_OK && err != HTTP_REAUTH) {
 609                 struct strbuf msg = STRBUF_INIT;
 610                 if (results->http_code && results->http_code != 200)
 611                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 612                 if (results->curl_result != CURLE_OK) {
 613                         if (msg.len)
 614                                 strbuf_addch(&msg, ' ');
 615                         strbuf_addf(&msg, "curl %d", results->curl_result);
 616                         if (curl_errorstr[0]) {
 617                                 strbuf_addch(&msg, ' ');
 618                                 strbuf_addstr(&msg, curl_errorstr);
 619                         }
 620                 }
 621                 error("RPC failed; %s", msg.buf);
 622                 strbuf_release(&msg);
 623         }
 624
 625         return err;
 626 }
 627
 628 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 629 {
 630         struct active_request_slot *slot;
 631         struct curl_slist *headers = http_copy_default_headers();
 632         struct strbuf buf = STRBUF_INIT;
 633         int err;
 634
 635         slot = get_active_slot();
 636
 637         headers = curl_slist_append(headers, rpc->hdr_content_type);
 638         headers = curl_slist_append(headers, rpc->hdr_accept);
 639
 640         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 641         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 642         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 643         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 644         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 645         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 646         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 647         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 648         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 649
 650         err = run_slot(slot, results);
 651
 652         curl_slist_free_all(headers);
 653         strbuf_release(&buf);
 654         return err;
 655 }
 656
 657 static curl_off_t xcurl_off_t(size_t len)
 658 {
 659         uintmax_t size = len;
 660         if (size > maximum_signed_value_of_type(curl_off_t))
 661                 die("cannot handle pushes this big");
 662         return (curl_off_t)size;
 663 }
 664
 665 static int post_rpc(struct rpc_state *rpc)
 666 {
 667         struct active_request_slot *slot;
 668         struct curl_slist *headers = http_copy_default_headers();
 669         int use_gzip = rpc->gzip_request;
 670         char *gzip_body = NULL;
 671         size_t gzip_size = 0;
 672         int err, large_request = 0;
 673         int needs_100_continue = 0;
 674         struct rpc_in_data rpc_in_data;
 675
 676         /* Try to load the entire request, if we can fit it into the
 677          * allocated buffer space we can use HTTP/1.0 and avoid the
 678          * chunked encoding mess.
 679          */
 680         while (1) {
 681                 size_t left = rpc->alloc - rpc->len;
 682                 char *buf = rpc->buf + rpc->len;
 683                 int n;
 684
 685                 if (left < LARGE_PACKET_MAX) {
 686                         large_request = 1;
 687                         use_gzip = 0;
 688                         break;
 689                 }
 690
 691                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 692                 if (!n)
 693                         break;
 694                 rpc->len += n;
 695         }
 696
 697         if (large_request) {
 698                 struct slot_results results;
 699
 700                 do {
 701                         err = probe_rpc(rpc, &results);
 702                         if (err == HTTP_REAUTH)
 703                                 credential_fill(&http_auth);
 704                 } while (err == HTTP_REAUTH);
 705                 if (err != HTTP_OK)
 706                         return -1;
 707
 708                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 709                         needs_100_continue = 1;
 710         }
 711
 712         headers = curl_slist_append(headers, rpc->hdr_content_type);
 713         headers = curl_slist_append(headers, rpc->hdr_accept);
 714         headers = curl_slist_append(headers, needs_100_continue ?
 715                 "Expect: 100-continue" : "Expect:");
 716
 717         /* Add the extra Git-Protocol header */
 718         if (rpc->protocol_header)
 719                 headers = curl_slist_append(headers, rpc->protocol_header);
 720
 721 retry:
 722         slot = get_active_slot();
 723
 724         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 725         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 726         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 727         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 728
 729         if (large_request) {
 730                 /* The request body is large and the size cannot be predicted.
 731                  * We must use chunked encoding to send it.
 732                  */
 733                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 734                 rpc->initial_buffer = 1;
 735                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 736                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 737 #ifndef NO_CURL_IOCTL
 738                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 739                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 740 #endif
 741                 if (options.verbosity > 1) {
 742                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 743                         fflush(stderr);
 744                 }
 745
 746         } else if (gzip_body) {
 747                 /*
 748                  * If we are looping to retry authentication, then the previous
 749                  * run will have set up the headers and gzip buffer already,
 750                  * and we just need to send it.
 751                  */
 752                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 753                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 754
 755         } else if (use_gzip && 1024 < rpc->len) {
 756                 /* The client backend isn't giving us compressed data so
 757                  * we can try to deflate it ourselves, this may save on
 758                  * the transfer time.
 759                  */
 760                 git_zstream stream;
 761                 int ret;
 762
 763                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 764                 gzip_size = git_deflate_bound(&stream, rpc->len);
 765                 gzip_body = xmalloc(gzip_size);
 766
 767                 stream.next_in = (unsigned char *)rpc->buf;
 768                 stream.avail_in = rpc->len;
 769                 stream.next_out = (unsigned char *)gzip_body;
 770                 stream.avail_out = gzip_size;
 771
 772                 ret = git_deflate(&stream, Z_FINISH);
 773                 if (ret != Z_STREAM_END)
 774                         die("cannot deflate request; zlib deflate error %d", ret);
 775
 776                 ret = git_deflate_end_gently(&stream);
 777                 if (ret != Z_OK)
 778                         die("cannot deflate request; zlib end error %d", ret);
 779
 780                 gzip_size = stream.total_out;
 781
 782                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 783                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 784                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 785
 786                 if (options.verbosity > 1) {
 787                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 788                                 rpc->service_name,
 789                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 790                         fflush(stderr);
 791                 }
 792         } else {
 793                 /* We know the complete request size in advance, use the
 794                  * more normal Content-Length approach.
 795                  */
 796                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 797                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 798                 if (options.verbosity > 1) {
 799                         fprintf(stderr, "POST %s (%lu bytes)\n",
 800                                 rpc->service_name, (unsigned long)rpc->len);
 801                         fflush(stderr);
 802                 }
 803         }
 804
 805         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 806         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 807         rpc_in_data.rpc = rpc;
 808         rpc_in_data.slot = slot;
 809         curl_easy_setopt(slot->curl, CURLOPT_FILE, &rpc_in_data);
 810         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
 811
 812
 813         rpc->any_written = 0;
 814         err = run_slot(slot, NULL);
 815         if (err == HTTP_REAUTH && !large_request) {
 816                 credential_fill(&http_auth);
 817                 goto retry;
 818         }
 819         if (err != HTTP_OK)
 820                 err = -1;
 821
 822         if (!rpc->any_written)
 823                 err = -1;
 824
 825         curl_slist_free_all(headers);
 826         free(gzip_body);
 827         return err;
 828 }
 829
 830 static int rpc_service(struct rpc_state *rpc, struct discovery *heads,
 831                        const char **client_argv, const struct strbuf *preamble)
 832 {
 833         const char *svc = rpc->service_name;
 834         struct strbuf buf = STRBUF_INIT;
 835         struct child_process client = CHILD_PROCESS_INIT;
 836         int err = 0;
 837
 838         client.in = -1;
 839         client.out = -1;
 840         client.git_cmd = 1;
 841         client.argv = client_argv;
 842         if (start_command(&client))
 843                 exit(1);
 844         write_or_die(client.in, preamble->buf, preamble->len);
 845         if (heads)
 846                 write_or_die(client.in, heads->buf, heads->len);
 847
 848         rpc->alloc = http_post_buffer;
 849         rpc->buf = xmalloc(rpc->alloc);
 850         rpc->in = client.in;
 851         rpc->out = client.out;
 852         strbuf_init(&rpc->result, 0);
 853
 854         strbuf_addf(&buf, "%s%s", url.buf, svc);
 855         rpc->service_url = strbuf_detach(&buf, NULL);
 856
 857         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 858         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 859
 860         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 861         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 862
 863         if (get_protocol_http_header(heads->version, &buf))
 864                 rpc->protocol_header = strbuf_detach(&buf, NULL);
 865         else
 866                 rpc->protocol_header = NULL;
 867
 868         while (!err) {
 869                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 870                 if (!n)
 871                         break;
 872                 rpc->pos = 0;
 873                 rpc->len = n;
 874                 err |= post_rpc(rpc);
 875         }
 876
 877         close(client.in);
 878         client.in = -1;
 879         if (!err) {
 880                 strbuf_read(&rpc->result, client.out, 0);
 881         } else {
 882                 char buf[4096];
 883                 for (;;)
 884                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 885                                 break;
 886         }
 887
 888         close(client.out);
 889         client.out = -1;
 890
 891         err |= finish_command(&client);
 892         free(rpc->service_url);
 893         free(rpc->hdr_content_type);
 894         free(rpc->hdr_accept);
 895         free(rpc->protocol_header);
 896         free(rpc->buf);
 897         strbuf_release(&buf);
 898         return err;
 899 }
 900
 901 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 902 {
 903         struct walker *walker;
 904         char **targets;
 905         int ret, i;
 906
 907         ALLOC_ARRAY(targets, nr_heads);
 908         if (options.depth || options.deepen_since)
 909                 die("dumb http transport does not support shallow capabilities");
 910         for (i = 0; i < nr_heads; i++)
 911                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 912
 913         walker = get_http_walker(url.buf);
 914         walker->get_verbosely = options.verbosity >= 3;
 915         walker->get_recover = 0;
 916         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 917         walker_free(walker);
 918
 919         for (i = 0; i < nr_heads; i++)
 920                 free(targets[i]);
 921         free(targets);
 922
 923         return ret ? error("fetch failed.") : 0;
 924 }
 925
 926 static int fetch_git(struct discovery *heads,
 927         int nr_heads, struct ref **to_fetch)
 928 {
 929         struct rpc_state rpc;
 930         struct strbuf preamble = STRBUF_INIT;
 931         int i, err;
 932         struct argv_array args = ARGV_ARRAY_INIT;
 933
 934         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 935                          "--stdin", "--lock-pack", NULL);
 936         if (options.followtags)
 937                 argv_array_push(&args, "--include-tag");
 938         if (options.thin)
 939                 argv_array_push(&args, "--thin");
 940         if (options.verbosity >= 3)
 941                 argv_array_pushl(&args, "-v", "-v", NULL);
 942         if (options.check_self_contained_and_connected)
 943                 argv_array_push(&args, "--check-self-contained-and-connected");
 944         if (options.cloning)
 945                 argv_array_push(&args, "--cloning");
 946         if (options.update_shallow)
 947                 argv_array_push(&args, "--update-shallow");
 948         if (!options.progress)
 949                 argv_array_push(&args, "--no-progress");
 950         if (options.depth)
 951                 argv_array_pushf(&args, "--depth=%lu", options.depth);
 952         if (options.deepen_since)
 953                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 954         for (i = 0; i < options.deepen_not.nr; i++)
 955                 argv_array_pushf(&args, "--shallow-exclude=%s",
 956                                  options.deepen_not.items[i].string);
 957         if (options.deepen_relative && options.depth)
 958                 argv_array_push(&args, "--deepen-relative");
 959         if (options.from_promisor)
 960                 argv_array_push(&args, "--from-promisor");
 961         if (options.no_dependents)
 962                 argv_array_push(&args, "--no-dependents");
 963         if (options.filter)
 964                 argv_array_pushf(&args, "--filter=%s", options.filter);
 965         argv_array_push(&args, url.buf);
 966
 967         for (i = 0; i < nr_heads; i++) {
 968                 struct ref *ref = to_fetch[i];
 969                 if (!*ref->name)
 970                         die("cannot fetch by sha1 over smart http");
 971                 packet_buf_write(&preamble, "%s %s\n",
 972                                  oid_to_hex(&ref->old_oid), ref->name);
 973         }
 974         packet_buf_flush(&preamble);
 975
 976         memset(&rpc, 0, sizeof(rpc));
 977         rpc.service_name = "git-upload-pack",
 978         rpc.gzip_request = 1;
 979
 980         err = rpc_service(&rpc, heads, args.argv, &preamble);
 981         if (rpc.result.len)
 982                 write_or_die(1, rpc.result.buf, rpc.result.len);
 983         strbuf_release(&rpc.result);
 984         strbuf_release(&preamble);
 985         argv_array_clear(&args);
 986         return err;
 987 }
 988
 989 static int fetch(int nr_heads, struct ref **to_fetch)
 990 {
 991         struct discovery *d = discover_refs("git-upload-pack", 0);
 992         if (d->proto_git)
 993                 return fetch_git(d, nr_heads, to_fetch);
 994         else
 995                 return fetch_dumb(nr_heads, to_fetch);
 996 }
 997
 998 static void parse_fetch(struct strbuf *buf)
 999 {
1000         struct ref **to_fetch = NULL;
1001         struct ref *list_head = NULL;
1002         struct ref **list = &list_head;
1003         int alloc_heads = 0, nr_heads = 0;
1004
1005         do {
1006                 const char *p;
1007                 if (skip_prefix(buf->buf, "fetch ", &p)) {
1008                         const char *name;
1009                         struct ref *ref;
1010                         struct object_id old_oid;
1011
1012                         if (get_oid_hex(p, &old_oid))
1013                                 die("protocol error: expected sha/ref, got %s'", p);
1014                         if (p[GIT_SHA1_HEXSZ] == ' ')
1015                                 name = p + GIT_SHA1_HEXSZ + 1;
1016                         else if (!p[GIT_SHA1_HEXSZ])
1017                                 name = "";
1018                         else
1019                                 die("protocol error: expected sha/ref, got %s'", p);
1020
1021                         ref = alloc_ref(name);
1022                         oidcpy(&ref->old_oid, &old_oid);
1023
1024                         *list = ref;
1025                         list = &ref->next;
1026
1027                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1028                         to_fetch[nr_heads++] = ref;
1029                 }
1030                 else
1031                         die("http transport does not support %s", buf->buf);
1032
1033                 strbuf_reset(buf);
1034                 if (strbuf_getline_lf(buf, stdin) == EOF)
1035                         return;
1036                 if (!*buf->buf)
1037                         break;
1038         } while (1);
1039
1040         if (fetch(nr_heads, to_fetch))
1041                 exit(128); /* error already reported */
1042         free_refs(list_head);
1043         free(to_fetch);
1044
1045         printf("\n");
1046         fflush(stdout);
1047         strbuf_reset(buf);
1048 }
1049
1050 static int push_dav(int nr_spec, char **specs)
1051 {
1052         struct child_process child = CHILD_PROCESS_INIT;
1053         size_t i;
1054
1055         child.git_cmd = 1;
1056         argv_array_push(&child.args, "http-push");
1057         argv_array_push(&child.args, "--helper-status");
1058         if (options.dry_run)
1059                 argv_array_push(&child.args, "--dry-run");
1060         if (options.verbosity > 1)
1061                 argv_array_push(&child.args, "--verbose");
1062         argv_array_push(&child.args, url.buf);
1063         for (i = 0; i < nr_spec; i++)
1064                 argv_array_push(&child.args, specs[i]);
1065
1066         if (run_command(&child))
1067                 die("git-http-push failed");
1068         return 0;
1069 }
1070
1071 static int push_git(struct discovery *heads, int nr_spec, char **specs)
1072 {
1073         struct rpc_state rpc;
1074         int i, err;
1075         struct argv_array args;
1076         struct string_list_item *cas_option;
1077         struct strbuf preamble = STRBUF_INIT;
1078
1079         argv_array_init(&args);
1080         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1081                          NULL);
1082
1083         if (options.thin)
1084                 argv_array_push(&args, "--thin");
1085         if (options.dry_run)
1086                 argv_array_push(&args, "--dry-run");
1087         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1088                 argv_array_push(&args, "--signed=yes");
1089         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1090                 argv_array_push(&args, "--signed=if-asked");
1091         if (options.verbosity == 0)
1092                 argv_array_push(&args, "--quiet");
1093         else if (options.verbosity > 1)
1094                 argv_array_push(&args, "--verbose");
1095         for (i = 0; i < options.push_options.nr; i++)
1096                 argv_array_pushf(&args, "--push-option=%s",
1097                                  options.push_options.items[i].string);
1098         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1099         for_each_string_list_item(cas_option, &cas_options)
1100                 argv_array_push(&args, cas_option->string);
1101         argv_array_push(&args, url.buf);
1102
1103         argv_array_push(&args, "--stdin");
1104         for (i = 0; i < nr_spec; i++)
1105                 packet_buf_write(&preamble, "%s\n", specs[i]);
1106         packet_buf_flush(&preamble);
1107
1108         memset(&rpc, 0, sizeof(rpc));
1109         rpc.service_name = "git-receive-pack",
1110
1111         err = rpc_service(&rpc, heads, args.argv, &preamble);
1112         if (rpc.result.len)
1113                 write_or_die(1, rpc.result.buf, rpc.result.len);
1114         strbuf_release(&rpc.result);
1115         strbuf_release(&preamble);
1116         argv_array_clear(&args);
1117         return err;
1118 }
1119
1120 static int push(int nr_spec, char **specs)
1121 {
1122         struct discovery *heads = discover_refs("git-receive-pack", 1);
1123         int ret;
1124
1125         if (heads->proto_git)
1126                 ret = push_git(heads, nr_spec, specs);
1127         else
1128                 ret = push_dav(nr_spec, specs);
1129         free_discovery(heads);
1130         return ret;
1131 }
1132
1133 static void parse_push(struct strbuf *buf)
1134 {
1135         char **specs = NULL;
1136         int alloc_spec = 0, nr_spec = 0, i, ret;
1137
1138         do {
1139                 if (starts_with(buf->buf, "push ")) {
1140                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1141                         specs[nr_spec++] = xstrdup(buf->buf + 5);
1142                 }
1143                 else
1144                         die("http transport does not support %s", buf->buf);
1145
1146                 strbuf_reset(buf);
1147                 if (strbuf_getline_lf(buf, stdin) == EOF)
1148                         goto free_specs;
1149                 if (!*buf->buf)
1150                         break;
1151         } while (1);
1152
1153         ret = push(nr_spec, specs);
1154         printf("\n");
1155         fflush(stdout);
1156
1157         if (ret)
1158                 exit(128); /* error already reported */
1159
1160  free_specs:
1161         for (i = 0; i < nr_spec; i++)
1162                 free(specs[i]);
1163         free(specs);
1164 }
1165
1166 /*
1167  * Used to represent the state of a connection to an HTTP server when
1168  * communicating using git's wire-protocol version 2.
1169  */
1170 struct proxy_state {
1171         char *service_name;
1172         char *service_url;
1173         struct curl_slist *headers;
1174         struct strbuf request_buffer;
1175         int in;
1176         int out;
1177         struct packet_reader reader;
1178         size_t pos;
1179         int seen_flush;
1180 };
1181
1182 static void proxy_state_init(struct proxy_state *p, const char *service_name,
1183                              enum protocol_version version)
1184 {
1185         struct strbuf buf = STRBUF_INIT;
1186
1187         memset(p, 0, sizeof(*p));
1188         p->service_name = xstrdup(service_name);
1189
1190         p->in = 0;
1191         p->out = 1;
1192         strbuf_init(&p->request_buffer, 0);
1193
1194         strbuf_addf(&buf, "%s%s", url.buf, p->service_name);
1195         p->service_url = strbuf_detach(&buf, NULL);
1196
1197         p->headers = http_copy_default_headers();
1198
1199         strbuf_addf(&buf, "Content-Type: application/x-%s-request", p->service_name);
1200         p->headers = curl_slist_append(p->headers, buf.buf);
1201         strbuf_reset(&buf);
1202
1203         strbuf_addf(&buf, "Accept: application/x-%s-result", p->service_name);
1204         p->headers = curl_slist_append(p->headers, buf.buf);
1205         strbuf_reset(&buf);
1206
1207         p->headers = curl_slist_append(p->headers, "Transfer-Encoding: chunked");
1208
1209         /* Add the Git-Protocol header */
1210         if (get_protocol_http_header(version, &buf))
1211                 p->headers = curl_slist_append(p->headers, buf.buf);
1212
1213         packet_reader_init(&p->reader, p->in, NULL, 0,
1214                            PACKET_READ_GENTLE_ON_EOF |
1215                            PACKET_READ_DIE_ON_ERR_PACKET);
1216
1217         strbuf_release(&buf);
1218 }
1219
1220 static void proxy_state_clear(struct proxy_state *p)
1221 {
1222         free(p->service_name);
1223         free(p->service_url);
1224         curl_slist_free_all(p->headers);
1225         strbuf_release(&p->request_buffer);
1226 }
1227
1228 /*
1229  * CURLOPT_READFUNCTION callback function.
1230  * Attempts to copy over a single packet-line at a time into the
1231  * curl provided buffer.
1232  */
1233 static size_t proxy_in(char *buffer, size_t eltsize,
1234                        size_t nmemb, void *userdata)
1235 {
1236         size_t max;
1237         struct proxy_state *p = userdata;
1238         size_t avail = p->request_buffer.len - p->pos;
1239
1240
1241         if (eltsize != 1)
1242                 BUG("curl read callback called with size = %"PRIuMAX" != 1",
1243                     (uintmax_t)eltsize);
1244         max = nmemb;
1245
1246         if (!avail) {
1247                 if (p->seen_flush) {
1248                         p->seen_flush = 0;
1249                         return 0;
1250                 }
1251
1252                 strbuf_reset(&p->request_buffer);
1253                 switch (packet_reader_read(&p->reader)) {
1254                 case PACKET_READ_EOF:
1255                         die("unexpected EOF when reading from parent process");
1256                 case PACKET_READ_NORMAL:
1257                         packet_buf_write_len(&p->request_buffer, p->reader.line,
1258                                              p->reader.pktlen);
1259                         break;
1260                 case PACKET_READ_DELIM:
1261                         packet_buf_delim(&p->request_buffer);
1262                         break;
1263                 case PACKET_READ_FLUSH:
1264                         packet_buf_flush(&p->request_buffer);
1265                         p->seen_flush = 1;
1266                         break;
1267                 }
1268                 p->pos = 0;
1269                 avail = p->request_buffer.len;
1270         }
1271
1272         if (max < avail)
1273                 avail = max;
1274         memcpy(buffer, p->request_buffer.buf + p->pos, avail);
1275         p->pos += avail;
1276         return avail;
1277 }
1278
1279 static size_t proxy_out(char *buffer, size_t eltsize,
1280                         size_t nmemb, void *userdata)
1281 {
1282         size_t size;
1283         struct proxy_state *p = userdata;
1284
1285         if (eltsize != 1)
1286                 BUG("curl read callback called with size = %"PRIuMAX" != 1",
1287                     (uintmax_t)eltsize);
1288         size = nmemb;
1289
1290         write_or_die(p->out, buffer, size);
1291         return size;
1292 }
1293
1294 /* Issues a request to the HTTP server configured in `p` */
1295 static int proxy_request(struct proxy_state *p)
1296 {
1297         struct active_request_slot *slot;
1298
1299         slot = get_active_slot();
1300
1301         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1302         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1303         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
1304         curl_easy_setopt(slot->curl, CURLOPT_URL, p->service_url);
1305         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, p->headers);
1306
1307         /* Setup function to read request from client */
1308         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, proxy_in);
1309         curl_easy_setopt(slot->curl, CURLOPT_READDATA, p);
1310
1311         /* Setup function to write server response to client */
1312         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, proxy_out);
1313         curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, p);
1314
1315         if (run_slot(slot, NULL) != HTTP_OK)
1316                 return -1;
1317
1318         return 0;
1319 }
1320
1321 static int stateless_connect(const char *service_name)
1322 {
1323         struct discovery *discover;
1324         struct proxy_state p;
1325
1326         /*
1327          * Run the info/refs request and see if the server supports protocol
1328          * v2.  If and only if the server supports v2 can we successfully
1329          * establish a stateless connection, otherwise we need to tell the
1330          * client to fallback to using other transport helper functions to
1331          * complete their request.
1332          */
1333         discover = discover_refs(service_name, 0);
1334         if (discover->version != protocol_v2) {
1335                 printf("fallback\n");
1336                 fflush(stdout);
1337                 return -1;
1338         } else {
1339                 /* Stateless Connection established */
1340                 printf("\n");
1341                 fflush(stdout);
1342         }
1343
1344         proxy_state_init(&p, service_name, discover->version);
1345
1346         /*
1347          * Dump the capability listing that we got from the server earlier
1348          * during the info/refs request.
1349          */
1350         write_or_die(p.out, discover->buf, discover->len);
1351
1352         /* Peek the next packet line.  Until we see EOF keep sending POSTs */
1353         while (packet_reader_peek(&p.reader) != PACKET_READ_EOF) {
1354                 if (proxy_request(&p)) {
1355                         /* We would have an err here */
1356                         break;
1357                 }
1358         }
1359
1360         proxy_state_clear(&p);
1361         return 0;
1362 }
1363
1364 int cmd_main(int argc, const char **argv)
1365 {
1366         struct strbuf buf = STRBUF_INIT;
1367         int nongit;
1368
1369         setup_git_directory_gently(&nongit);
1370         if (argc < 2) {
1371                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
1372                 return 1;
1373         }
1374
1375         options.verbosity = 1;
1376         options.progress = !!isatty(2);
1377         options.thin = 1;
1378         string_list_init(&options.deepen_not, 1);
1379         string_list_init(&options.push_options, 1);
1380
1381         remote = remote_get(argv[1]);
1382
1383         if (argc > 2) {
1384                 end_url_with_slash(&url, argv[2]);
1385         } else {
1386                 end_url_with_slash(&url, remote->url[0]);
1387         }
1388
1389         http_init(remote, url.buf, 0);
1390
1391         do {
1392                 const char *arg;
1393
1394                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1395                         if (ferror(stdin))
1396                                 error("remote-curl: error reading command stream from git");
1397                         return 1;
1398                 }
1399                 if (buf.len == 0)
1400                         break;
1401                 if (starts_with(buf.buf, "fetch ")) {
1402                         if (nongit)
1403                                 die("remote-curl: fetch attempted without a local repo");
1404                         parse_fetch(&buf);
1405
1406                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1407                         int for_push = !!strstr(buf.buf + 4, "for-push");
1408                         output_refs(get_refs(for_push));
1409
1410                 } else if (starts_with(buf.buf, "push ")) {
1411                         parse_push(&buf);
1412
1413                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1414                         char *value = strchr(arg, ' ');
1415                         int result;
1416
1417                         if (value)
1418                                 *value++ = '\0';
1419                         else
1420                                 value = "true";
1421
1422                         result = set_option(arg, value);
1423                         if (!result)
1424                                 printf("ok\n");
1425                         else if (result < 0)
1426                                 printf("error invalid value\n");
1427                         else
1428                                 printf("unsupported\n");
1429                         fflush(stdout);
1430
1431                 } else if (!strcmp(buf.buf, "capabilities")) {
1432                         printf("stateless-connect\n");
1433                         printf("fetch\n");
1434                         printf("option\n");
1435                         printf("push\n");
1436                         printf("check-connectivity\n");
1437                         printf("\n");
1438                         fflush(stdout);
1439                 } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1440                         if (!stateless_connect(arg))
1441                                 break;
1442                 } else {
1443                         error("remote-curl: unknown command '%s' from git", buf.buf);
1444                         return 1;
1445                 }
1446                 strbuf_reset(&buf);
1447         } while (1);
1448
1449         http_cleanup();
1450
1451         return 0;
1452 }