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