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