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