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