git.oblomov.eu Git - git/blob - remote-curl.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "remote.h"
   4 #include "connect.h"
   5 #include "strbuf.h"
   6 #include "walker.h"
   7 #include "http.h"
   8 #include "exec-cmd.h"
   9 #include "run-command.h"
  10 #include "pkt-line.h"
  11 #include "string-list.h"
  12 #include "sideband.h"
  13 #include "argv-array.h"
  14 #include "credential.h"
  15 #include "sha1-array.h"
  16 #include "send-pack.h"
  17 #include "protocol.h"
  18 #include "quote.h"
  19 #include "transport.h"
  20
  21 static struct remote *remote;
  22 /* always ends with a trailing slash */
  23 static struct strbuf url = STRBUF_INIT;
  24
  25 struct options {
  26         int verbosity;
  27         unsigned long depth;
  28         char *deepen_since;
  29         struct string_list deepen_not;
  30         struct string_list push_options;
  31         char *filter;
  32         unsigned progress : 1,
  33                 check_self_contained_and_connected : 1,
  34                 cloning : 1,
  35                 update_shallow : 1,
  36                 followtags : 1,
  37                 dry_run : 1,
  38                 thin : 1,
  39                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
  40                 push_cert : 2,
  41                 deepen_relative : 1,
  42                 from_promisor : 1,
  43                 no_dependents : 1;
  44 };
  45 static struct options options;
  46 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  47
  48 static int set_option(const char *name, const char *value)
  49 {
  50         if (!strcmp(name, "verbosity")) {
  51                 char *end;
  52                 int v = strtol(value, &end, 10);
  53                 if (value == end || *end)
  54                         return -1;
  55                 options.verbosity = v;
  56                 return 0;
  57         }
  58         else if (!strcmp(name, "progress")) {
  59                 if (!strcmp(value, "true"))
  60                         options.progress = 1;
  61                 else if (!strcmp(value, "false"))
  62                         options.progress = 0;
  63                 else
  64                         return -1;
  65                 return 0;
  66         }
  67         else if (!strcmp(name, "depth")) {
  68                 char *end;
  69                 unsigned long v = strtoul(value, &end, 10);
  70                 if (value == end || *end)
  71                         return -1;
  72                 options.depth = v;
  73                 return 0;
  74         }
  75         else if (!strcmp(name, "deepen-since")) {
  76                 options.deepen_since = xstrdup(value);
  77                 return 0;
  78         }
  79         else if (!strcmp(name, "deepen-not")) {
  80                 string_list_append(&options.deepen_not, value);
  81                 return 0;
  82         }
  83         else if (!strcmp(name, "deepen-relative")) {
  84                 if (!strcmp(value, "true"))
  85                         options.deepen_relative = 1;
  86                 else if (!strcmp(value, "false"))
  87                         options.deepen_relative = 0;
  88                 else
  89                         return -1;
  90                 return 0;
  91         }
  92         else if (!strcmp(name, "followtags")) {
  93                 if (!strcmp(value, "true"))
  94                         options.followtags = 1;
  95                 else if (!strcmp(value, "false"))
  96                         options.followtags = 0;
  97                 else
  98                         return -1;
  99                 return 0;
 100         }
 101         else if (!strcmp(name, "dry-run")) {
 102                 if (!strcmp(value, "true"))
 103                         options.dry_run = 1;
 104                 else if (!strcmp(value, "false"))
 105                         options.dry_run = 0;
 106                 else
 107                         return -1;
 108                 return 0;
 109         }
 110         else if (!strcmp(name, "check-connectivity")) {
 111                 if (!strcmp(value, "true"))
 112                         options.check_self_contained_and_connected = 1;
 113                 else if (!strcmp(value, "false"))
 114                         options.check_self_contained_and_connected = 0;
 115                 else
 116                         return -1;
 117                 return 0;
 118         }
 119         else if (!strcmp(name, "cas")) {
 120                 struct strbuf val = STRBUF_INIT;
 121                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 122                 string_list_append(&cas_options, val.buf);
 123                 strbuf_release(&val);
 124                 return 0;
 125         } else if (!strcmp(name, "cloning")) {
 126                 if (!strcmp(value, "true"))
 127                         options.cloning = 1;
 128                 else if (!strcmp(value, "false"))
 129                         options.cloning = 0;
 130                 else
 131                         return -1;
 132                 return 0;
 133         } else if (!strcmp(name, "update-shallow")) {
 134                 if (!strcmp(value, "true"))
 135                         options.update_shallow = 1;
 136                 else if (!strcmp(value, "false"))
 137                         options.update_shallow = 0;
 138                 else
 139                         return -1;
 140                 return 0;
 141         } else if (!strcmp(name, "pushcert")) {
 142                 if (!strcmp(value, "true"))
 143                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 144                 else if (!strcmp(value, "false"))
 145                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 146                 else if (!strcmp(value, "if-asked"))
 147                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 148                 else
 149                         return -1;
 150                 return 0;
 151         } else if (!strcmp(name, "push-option")) {
 152                 if (*value != '"')
 153                         string_list_append(&options.push_options, value);
 154                 else {
 155                         struct strbuf unquoted = STRBUF_INIT;
 156                         if (unquote_c_style(&unquoted, value, NULL) < 0)
 157                                 die("invalid quoting in push-option value");
 158                         string_list_append_nodup(&options.push_options,
 159                                                  strbuf_detach(&unquoted, NULL));
 160                 }
 161                 return 0;
 162
 163 #if LIBCURL_VERSION_NUM >= 0x070a08
 164         } else if (!strcmp(name, "family")) {
 165                 if (!strcmp(value, "ipv4"))
 166                         git_curl_ipresolve = CURL_IPRESOLVE_V4;
 167                 else if (!strcmp(value, "ipv6"))
 168                         git_curl_ipresolve = CURL_IPRESOLVE_V6;
 169                 else if (!strcmp(value, "all"))
 170                         git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 171                 else
 172                         return -1;
 173                 return 0;
 174 #endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 175         } else if (!strcmp(name, "from-promisor")) {
 176                 options.from_promisor = 1;
 177                 return 0;
 178         } else if (!strcmp(name, "no-dependents")) {
 179                 options.no_dependents = 1;
 180                 return 0;
 181         } else if (!strcmp(name, "filter")) {
 182                 options.filter = xstrdup(value);
 183                 return 0;
 184         } else {
 185                 return 1 /* unsupported */;
 186         }
 187 }
 188
 189 struct discovery {
 190         char *service;
 191         char *buf_alloc;
 192         char *buf;
 193         size_t len;
 194         struct ref *refs;
 195         struct oid_array shallow;
 196         enum protocol_version version;
 197         unsigned proto_git : 1;
 198 };
 199 static struct discovery *last_discovery;
 200
 201 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 202 {
 203         struct ref *list = NULL;
 204         struct packet_reader reader;
 205
 206         packet_reader_init(&reader, -1, heads->buf, heads->len,
 207                            PACKET_READ_CHOMP_NEWLINE |
 208                            PACKET_READ_GENTLE_ON_EOF);
 209
 210         heads->version = discover_version(&reader);
 211         switch (heads->version) {
 212         case protocol_v2:
 213                 /*
 214                  * Do nothing.  This isn't a list of refs but rather a
 215                  * capability advertisement.  Client would have run
 216                  * 'stateless-connect' so we'll dump this capability listing
 217                  * and let them request the refs themselves.
 218                  */
 219                 break;
 220         case protocol_v1:
 221         case protocol_v0:
 222                 get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
 223                                  NULL, &heads->shallow);
 224                 break;
 225         case protocol_unknown_version:
 226                 BUG("unknown protocol version");
 227         }
 228
 229         return list;
 230 }
 231
 232 static struct ref *parse_info_refs(struct discovery *heads)
 233 {
 234         char *data, *start, *mid;
 235         char *ref_name;
 236         int i = 0;
 237
 238         struct ref *refs = NULL;
 239         struct ref *ref = NULL;
 240         struct ref *last_ref = NULL;
 241
 242         data = heads->buf;
 243         start = NULL;
 244         mid = data;
 245         while (i < heads->len) {
 246                 if (!start) {
 247                         start = &data[i];
 248                 }
 249                 if (data[i] == '\t')
 250                         mid = &data[i];
 251                 if (data[i] == '\n') {
 252                         if (mid - start != 40)
 253                                 die("%sinfo/refs not valid: is this a git repository?",
 254                                     transport_anonymize_url(url.buf));
 255                         data[i] = 0;
 256                         ref_name = mid + 1;
 257                         ref = alloc_ref(ref_name);
 258                         get_oid_hex(start, &ref->old_oid);
 259                         if (!refs)
 260                                 refs = ref;
 261                         if (last_ref)
 262                                 last_ref->next = ref;
 263                         last_ref = ref;
 264                         start = NULL;
 265                 }
 266                 i++;
 267         }
 268
 269         ref = alloc_ref("HEAD");
 270         if (!http_fetch_ref(url.buf, ref) &&
 271             !resolve_remote_symref(ref, refs)) {
 272                 ref->next = refs;
 273                 refs = ref;
 274         } else {
 275                 free(ref);
 276         }
 277
 278         return refs;
 279 }
 280
 281 static void free_discovery(struct discovery *d)
 282 {
 283         if (d) {
 284                 if (d == last_discovery)
 285                         last_discovery = NULL;
 286                 free(d->shallow.oid);
 287                 free(d->buf_alloc);
 288                 free_refs(d->refs);
 289                 free(d->service);
 290                 free(d);
 291         }
 292 }
 293
 294 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 295                              struct strbuf *msg)
 296 {
 297         const char *p, *eol;
 298
 299         /*
 300          * We only show text/plain parts, as other types are likely
 301          * to be ugly to look at on the user's terminal.
 302          */
 303         if (strcmp(type->buf, "text/plain"))
 304                 return -1;
 305         if (charset->len)
 306                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 307
 308         strbuf_trim(msg);
 309         if (!msg->len)
 310                 return -1;
 311
 312         p = msg->buf;
 313         do {
 314                 eol = strchrnul(p, '\n');
 315                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 316                 p = eol + 1;
 317         } while(*eol);
 318         return 0;
 319 }
 320
 321 static int get_protocol_http_header(enum protocol_version version,
 322                                     struct strbuf *header)
 323 {
 324         if (version > 0) {
 325                 strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
 326                             version);
 327
 328                 return 1;
 329         }
 330
 331         return 0;
 332 }
 333
 334 static struct discovery *discover_refs(const char *service, int for_push)
 335 {
 336         struct strbuf exp = STRBUF_INIT;
 337         struct strbuf type = STRBUF_INIT;
 338         struct strbuf charset = STRBUF_INIT;
 339         struct strbuf buffer = STRBUF_INIT;
 340         struct strbuf refs_url = STRBUF_INIT;
 341         struct strbuf effective_url = STRBUF_INIT;
 342         struct strbuf protocol_header = STRBUF_INIT;
 343         struct string_list extra_headers = STRING_LIST_INIT_DUP;
 344         struct discovery *last = last_discovery;
 345         int http_ret, maybe_smart = 0;
 346         struct http_get_options http_options;
 347         enum protocol_version version = get_protocol_version_config();
 348
 349         if (last && !strcmp(service, last->service))
 350                 return last;
 351         free_discovery(last);
 352
 353         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 354         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 355              git_env_bool("GIT_SMART_HTTP", 1)) {
 356                 maybe_smart = 1;
 357                 if (!strchr(url.buf, '?'))
 358                         strbuf_addch(&refs_url, '?');
 359                 else
 360                         strbuf_addch(&refs_url, '&');
 361                 strbuf_addf(&refs_url, "service=%s", service);
 362         }
 363
 364         /*
 365          * NEEDSWORK: If we are trying to use protocol v2 and we are planning
 366          * to perform a push, then fallback to v0 since the client doesn't know
 367          * how to push yet using v2.
 368          */
 369         if (version == protocol_v2 && !strcmp("git-receive-pack", service))
 370                 version = protocol_v0;
 371
 372         /* Add the extra Git-Protocol header */
 373         if (get_protocol_http_header(version, &protocol_header))
 374                 string_list_append(&extra_headers, protocol_header.buf);
 375
 376         memset(&http_options, 0, sizeof(http_options));
 377         http_options.content_type = &type;
 378         http_options.charset = &charset;
 379         http_options.effective_url = &effective_url;
 380         http_options.base_url = &url;
 381         http_options.extra_headers = &extra_headers;
 382         http_options.initial_request = 1;
 383         http_options.no_cache = 1;
 384         http_options.keep_error = 1;
 385
 386         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 387         switch (http_ret) {
 388         case HTTP_OK:
 389                 break;
 390         case HTTP_MISSING_TARGET:
 391                 show_http_message(&type, &charset, &buffer);
 392                 die("repository '%s' not found",
 393                     transport_anonymize_url(url.buf));
 394         case HTTP_NOAUTH:
 395                 show_http_message(&type, &charset, &buffer);
 396                 die("Authentication failed for '%s'",
 397                     transport_anonymize_url(url.buf));
 398         default:
 399                 show_http_message(&type, &charset, &buffer);
 400                 die("unable to access '%s': %s",
 401                     transport_anonymize_url(url.buf), curl_errorstr);
 402         }
 403
 404         if (options.verbosity && !starts_with(refs_url.buf, url.buf)) {
 405                 char *u = transport_anonymize_url(url.buf);
 406                 warning(_("redirecting to %s"), u);
 407                 free(u);
 408         }
 409
 410         last= xcalloc(1, sizeof(*last_discovery));
 411         last->service = xstrdup(service);
 412         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 413         last->buf = last->buf_alloc;
 414
 415         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 416         if (maybe_smart &&
 417             (5 <= last->len && last->buf[4] == '#') &&
 418             !strbuf_cmp(&exp, &type)) {
 419                 char *line;
 420
 421                 /*
 422                  * smart HTTP response; validate that the service
 423                  * pkt-line matches our request.
 424                  */
 425                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 426                 if (!line)
 427                         die("invalid server response; expected service, got flush packet");
 428
 429                 strbuf_reset(&exp);
 430                 strbuf_addf(&exp, "# service=%s", service);
 431                 if (strcmp(line, exp.buf))
 432                         die("invalid server response; got '%s'", line);
 433                 strbuf_release(&exp);
 434
 435                 /* The header can include additional metadata lines, up
 436                  * until a packet flush marker.  Ignore these now, but
 437                  * in the future we might start to scan them.
 438                  */
 439                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 440                         ;
 441
 442                 last->proto_git = 1;
 443         } else if (maybe_smart &&
 444                    last->len > 5 && starts_with(last->buf + 4, "version 2")) {
 445                 last->proto_git = 1;
 446         }
 447
 448         if (last->proto_git)
 449                 last->refs = parse_git_refs(last, for_push);
 450         else
 451                 last->refs = parse_info_refs(last);
 452
 453         strbuf_release(&refs_url);
 454         strbuf_release(&exp);
 455         strbuf_release(&type);
 456         strbuf_release(&charset);
 457         strbuf_release(&effective_url);
 458         strbuf_release(&buffer);
 459         strbuf_release(&protocol_header);
 460         string_list_clear(&extra_headers, 0);
 461         last_discovery = last;
 462         return last;
 463 }
 464
 465 static struct ref *get_refs(int for_push)
 466 {
 467         struct discovery *heads;
 468
 469         if (for_push)
 470                 heads = discover_refs("git-receive-pack", for_push);
 471         else
 472                 heads = discover_refs("git-upload-pack", for_push);
 473
 474         return heads->refs;
 475 }
 476
 477 static void output_refs(struct ref *refs)
 478 {
 479         struct ref *posn;
 480         for (posn = refs; posn; posn = posn->next) {
 481                 if (posn->symref)
 482                         printf("@%s %s\n", posn->symref, posn->name);
 483                 else
 484                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 485         }
 486         printf("\n");
 487         fflush(stdout);
 488 }
 489
 490 struct rpc_state {
 491         const char *service_name;
 492         const char **argv;
 493         struct strbuf *stdin_preamble;
 494         char *service_url;
 495         char *hdr_content_type;
 496         char *hdr_accept;
 497         char *protocol_header;
 498         char *buf;
 499         size_t alloc;
 500         size_t len;
 501         size_t pos;
 502         int in;
 503         int out;
 504         int any_written;
 505         struct strbuf result;
 506         unsigned gzip_request : 1;
 507         unsigned initial_buffer : 1;
 508 };
 509
 510 static size_t rpc_out(void *ptr, size_t eltsize,
 511                 size_t nmemb, void *buffer_)
 512 {
 513         size_t max = eltsize * nmemb;
 514         struct rpc_state *rpc = buffer_;
 515         size_t avail = rpc->len - rpc->pos;
 516
 517         if (!avail) {
 518                 rpc->initial_buffer = 0;
 519                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 520                 if (!avail)
 521                         return 0;
 522                 rpc->pos = 0;
 523                 rpc->len = avail;
 524         }
 525
 526         if (max < avail)
 527                 avail = max;
 528         memcpy(ptr, rpc->buf + rpc->pos, avail);
 529         rpc->pos += avail;
 530         return avail;
 531 }
 532
 533 #ifndef NO_CURL_IOCTL
 534 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 535 {
 536         struct rpc_state *rpc = clientp;
 537
 538         switch (cmd) {
 539         case CURLIOCMD_NOP:
 540                 return CURLIOE_OK;
 541
 542         case CURLIOCMD_RESTARTREAD:
 543                 if (rpc->initial_buffer) {
 544                         rpc->pos = 0;
 545                         return CURLIOE_OK;
 546                 }
 547                 error("unable to rewind rpc post data - try increasing http.postBuffer");
 548                 return CURLIOE_FAILRESTART;
 549
 550         default:
 551                 return CURLIOE_UNKNOWNCMD;
 552         }
 553 }
 554 #endif
 555
 556 static size_t rpc_in(char *ptr, size_t eltsize,
 557                 size_t nmemb, void *buffer_)
 558 {
 559         size_t size = eltsize * nmemb;
 560         struct rpc_state *rpc = buffer_;
 561         if (size)
 562                 rpc->any_written = 1;
 563         write_or_die(rpc->in, ptr, size);
 564         return size;
 565 }
 566
 567 static int run_slot(struct active_request_slot *slot,
 568                     struct slot_results *results)
 569 {
 570         int err;
 571         struct slot_results results_buf;
 572
 573         if (!results)
 574                 results = &results_buf;
 575
 576         err = run_one_slot(slot, results);
 577
 578         if (err != HTTP_OK && err != HTTP_REAUTH) {
 579                 struct strbuf msg = STRBUF_INIT;
 580                 if (results->http_code && results->http_code != 200)
 581                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 582                 if (results->curl_result != CURLE_OK) {
 583                         if (msg.len)
 584                                 strbuf_addch(&msg, ' ');
 585                         strbuf_addf(&msg, "curl %d", results->curl_result);
 586                         if (curl_errorstr[0]) {
 587                                 strbuf_addch(&msg, ' ');
 588                                 strbuf_addstr(&msg, curl_errorstr);
 589                         }
 590                 }
 591                 error("RPC failed; %s", msg.buf);
 592                 strbuf_release(&msg);
 593         }
 594
 595         return err;
 596 }
 597
 598 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 599 {
 600         struct active_request_slot *slot;
 601         struct curl_slist *headers = http_copy_default_headers();
 602         struct strbuf buf = STRBUF_INIT;
 603         int err;
 604
 605         slot = get_active_slot();
 606
 607         headers = curl_slist_append(headers, rpc->hdr_content_type);
 608         headers = curl_slist_append(headers, rpc->hdr_accept);
 609
 610         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 611         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 612         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 613         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 614         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 615         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 616         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 617         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 618         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 619
 620         err = run_slot(slot, results);
 621
 622         curl_slist_free_all(headers);
 623         strbuf_release(&buf);
 624         return err;
 625 }
 626
 627 static curl_off_t xcurl_off_t(ssize_t len) {
 628         if (len > maximum_signed_value_of_type(curl_off_t))
 629                 die("cannot handle pushes this big");
 630         return (curl_off_t) len;
 631 }
 632
 633 static int post_rpc(struct rpc_state *rpc)
 634 {
 635         struct active_request_slot *slot;
 636         struct curl_slist *headers = http_copy_default_headers();
 637         int use_gzip = rpc->gzip_request;
 638         char *gzip_body = NULL;
 639         size_t gzip_size = 0;
 640         int err, large_request = 0;
 641         int needs_100_continue = 0;
 642
 643         /* Try to load the entire request, if we can fit it into the
 644          * allocated buffer space we can use HTTP/1.0 and avoid the
 645          * chunked encoding mess.
 646          */
 647         while (1) {
 648                 size_t left = rpc->alloc - rpc->len;
 649                 char *buf = rpc->buf + rpc->len;
 650                 int n;
 651
 652                 if (left < LARGE_PACKET_MAX) {
 653                         large_request = 1;
 654                         use_gzip = 0;
 655                         break;
 656                 }
 657
 658                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 659                 if (!n)
 660                         break;
 661                 rpc->len += n;
 662         }
 663
 664         if (large_request) {
 665                 struct slot_results results;
 666
 667                 do {
 668                         err = probe_rpc(rpc, &results);
 669                         if (err == HTTP_REAUTH)
 670                                 credential_fill(&http_auth);
 671                 } while (err == HTTP_REAUTH);
 672                 if (err != HTTP_OK)
 673                         return -1;
 674
 675                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 676                         needs_100_continue = 1;
 677         }
 678
 679         headers = curl_slist_append(headers, rpc->hdr_content_type);
 680         headers = curl_slist_append(headers, rpc->hdr_accept);
 681         headers = curl_slist_append(headers, needs_100_continue ?
 682                 "Expect: 100-continue" : "Expect:");
 683
 684         /* Add the extra Git-Protocol header */
 685         if (rpc->protocol_header)
 686                 headers = curl_slist_append(headers, rpc->protocol_header);
 687
 688 retry:
 689         slot = get_active_slot();
 690
 691         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 692         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 693         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 694         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 695
 696         if (large_request) {
 697                 /* The request body is large and the size cannot be predicted.
 698                  * We must use chunked encoding to send it.
 699                  */
 700                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 701                 rpc->initial_buffer = 1;
 702                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 703                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 704 #ifndef NO_CURL_IOCTL
 705                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 706                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 707 #endif
 708                 if (options.verbosity > 1) {
 709                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 710                         fflush(stderr);
 711                 }
 712
 713         } else if (gzip_body) {
 714                 /*
 715                  * If we are looping to retry authentication, then the previous
 716                  * run will have set up the headers and gzip buffer already,
 717                  * and we just need to send it.
 718                  */
 719                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 720                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 721
 722         } else if (use_gzip && 1024 < rpc->len) {
 723                 /* The client backend isn't giving us compressed data so
 724                  * we can try to deflate it ourselves, this may save on
 725                  * the transfer time.
 726                  */
 727                 git_zstream stream;
 728                 int ret;
 729
 730                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 731                 gzip_size = git_deflate_bound(&stream, rpc->len);
 732                 gzip_body = xmalloc(gzip_size);
 733
 734                 stream.next_in = (unsigned char *)rpc->buf;
 735                 stream.avail_in = rpc->len;
 736                 stream.next_out = (unsigned char *)gzip_body;
 737                 stream.avail_out = gzip_size;
 738
 739                 ret = git_deflate(&stream, Z_FINISH);
 740                 if (ret != Z_STREAM_END)
 741                         die("cannot deflate request; zlib deflate error %d", ret);
 742
 743                 ret = git_deflate_end_gently(&stream);
 744                 if (ret != Z_OK)
 745                         die("cannot deflate request; zlib end error %d", ret);
 746
 747                 gzip_size = stream.total_out;
 748
 749                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 750                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 751                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 752
 753                 if (options.verbosity > 1) {
 754                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 755                                 rpc->service_name,
 756                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 757                         fflush(stderr);
 758                 }
 759         } else {
 760                 /* We know the complete request size in advance, use the
 761                  * more normal Content-Length approach.
 762                  */
 763                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 764                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 765                 if (options.verbosity > 1) {
 766                         fprintf(stderr, "POST %s (%lu bytes)\n",
 767                                 rpc->service_name, (unsigned long)rpc->len);
 768                         fflush(stderr);
 769                 }
 770         }
 771
 772         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 773         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 774         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 775
 776
 777         rpc->any_written = 0;
 778         err = run_slot(slot, NULL);
 779         if (err == HTTP_REAUTH && !large_request) {
 780                 credential_fill(&http_auth);
 781                 goto retry;
 782         }
 783         if (err != HTTP_OK)
 784                 err = -1;
 785
 786         if (!rpc->any_written)
 787                 err = -1;
 788
 789         curl_slist_free_all(headers);
 790         free(gzip_body);
 791         return err;
 792 }
 793
 794 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 795 {
 796         const char *svc = rpc->service_name;
 797         struct strbuf buf = STRBUF_INIT;
 798         struct strbuf *preamble = rpc->stdin_preamble;
 799         struct child_process client = CHILD_PROCESS_INIT;
 800         int err = 0;
 801
 802         client.in = -1;
 803         client.out = -1;
 804         client.git_cmd = 1;
 805         client.argv = rpc->argv;
 806         if (start_command(&client))
 807                 exit(1);
 808         if (preamble)
 809                 write_or_die(client.in, preamble->buf, preamble->len);
 810         if (heads)
 811                 write_or_die(client.in, heads->buf, heads->len);
 812
 813         rpc->alloc = http_post_buffer;
 814         rpc->buf = xmalloc(rpc->alloc);
 815         rpc->in = client.in;
 816         rpc->out = client.out;
 817         strbuf_init(&rpc->result, 0);
 818
 819         strbuf_addf(&buf, "%s%s", url.buf, svc);
 820         rpc->service_url = strbuf_detach(&buf, NULL);
 821
 822         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 823         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 824
 825         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 826         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 827
 828         if (get_protocol_http_header(heads->version, &buf))
 829                 rpc->protocol_header = strbuf_detach(&buf, NULL);
 830         else
 831                 rpc->protocol_header = NULL;
 832
 833         while (!err) {
 834                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 835                 if (!n)
 836                         break;
 837                 rpc->pos = 0;
 838                 rpc->len = n;
 839                 err |= post_rpc(rpc);
 840         }
 841
 842         close(client.in);
 843         client.in = -1;
 844         if (!err) {
 845                 strbuf_read(&rpc->result, client.out, 0);
 846         } else {
 847                 char buf[4096];
 848                 for (;;)
 849                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 850                                 break;
 851         }
 852
 853         close(client.out);
 854         client.out = -1;
 855
 856         err |= finish_command(&client);
 857         free(rpc->service_url);
 858         free(rpc->hdr_content_type);
 859         free(rpc->hdr_accept);
 860         free(rpc->protocol_header);
 861         free(rpc->buf);
 862         strbuf_release(&buf);
 863         return err;
 864 }
 865
 866 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 867 {
 868         struct walker *walker;
 869         char **targets;
 870         int ret, i;
 871
 872         ALLOC_ARRAY(targets, nr_heads);
 873         if (options.depth || options.deepen_since)
 874                 die("dumb http transport does not support shallow capabilities");
 875         for (i = 0; i < nr_heads; i++)
 876                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 877
 878         walker = get_http_walker(url.buf);
 879         walker->get_verbosely = options.verbosity >= 3;
 880         walker->get_recover = 0;
 881         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 882         walker_free(walker);
 883
 884         for (i = 0; i < nr_heads; i++)
 885                 free(targets[i]);
 886         free(targets);
 887
 888         return ret ? error("fetch failed.") : 0;
 889 }
 890
 891 static int fetch_git(struct discovery *heads,
 892         int nr_heads, struct ref **to_fetch)
 893 {
 894         struct rpc_state rpc;
 895         struct strbuf preamble = STRBUF_INIT;
 896         int i, err;
 897         struct argv_array args = ARGV_ARRAY_INIT;
 898
 899         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 900                          "--stdin", "--lock-pack", NULL);
 901         if (options.followtags)
 902                 argv_array_push(&args, "--include-tag");
 903         if (options.thin)
 904                 argv_array_push(&args, "--thin");
 905         if (options.verbosity >= 3)
 906                 argv_array_pushl(&args, "-v", "-v", NULL);
 907         if (options.check_self_contained_and_connected)
 908                 argv_array_push(&args, "--check-self-contained-and-connected");
 909         if (options.cloning)
 910                 argv_array_push(&args, "--cloning");
 911         if (options.update_shallow)
 912                 argv_array_push(&args, "--update-shallow");
 913         if (!options.progress)
 914                 argv_array_push(&args, "--no-progress");
 915         if (options.depth)
 916                 argv_array_pushf(&args, "--depth=%lu", options.depth);
 917         if (options.deepen_since)
 918                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 919         for (i = 0; i < options.deepen_not.nr; i++)
 920                 argv_array_pushf(&args, "--shallow-exclude=%s",
 921                                  options.deepen_not.items[i].string);
 922         if (options.deepen_relative && options.depth)
 923                 argv_array_push(&args, "--deepen-relative");
 924         if (options.from_promisor)
 925                 argv_array_push(&args, "--from-promisor");
 926         if (options.no_dependents)
 927                 argv_array_push(&args, "--no-dependents");
 928         if (options.filter)
 929                 argv_array_pushf(&args, "--filter=%s", options.filter);
 930         argv_array_push(&args, url.buf);
 931
 932         for (i = 0; i < nr_heads; i++) {
 933                 struct ref *ref = to_fetch[i];
 934                 if (!*ref->name)
 935                         die("cannot fetch by sha1 over smart http");
 936                 packet_buf_write(&preamble, "%s %s\n",
 937                                  oid_to_hex(&ref->old_oid), ref->name);
 938         }
 939         packet_buf_flush(&preamble);
 940
 941         memset(&rpc, 0, sizeof(rpc));
 942         rpc.service_name = "git-upload-pack",
 943         rpc.argv = args.argv;
 944         rpc.stdin_preamble = &preamble;
 945         rpc.gzip_request = 1;
 946
 947         err = rpc_service(&rpc, heads);
 948         if (rpc.result.len)
 949                 write_or_die(1, rpc.result.buf, rpc.result.len);
 950         strbuf_release(&rpc.result);
 951         strbuf_release(&preamble);
 952         argv_array_clear(&args);
 953         return err;
 954 }
 955
 956 static int fetch(int nr_heads, struct ref **to_fetch)
 957 {
 958         struct discovery *d = discover_refs("git-upload-pack", 0);
 959         if (d->proto_git)
 960                 return fetch_git(d, nr_heads, to_fetch);
 961         else
 962                 return fetch_dumb(nr_heads, to_fetch);
 963 }
 964
 965 static void parse_fetch(struct strbuf *buf)
 966 {
 967         struct ref **to_fetch = NULL;
 968         struct ref *list_head = NULL;
 969         struct ref **list = &list_head;
 970         int alloc_heads = 0, nr_heads = 0;
 971
 972         do {
 973                 const char *p;
 974                 if (skip_prefix(buf->buf, "fetch ", &p)) {
 975                         const char *name;
 976                         struct ref *ref;
 977                         struct object_id old_oid;
 978
 979                         if (get_oid_hex(p, &old_oid))
 980                                 die("protocol error: expected sha/ref, got %s'", p);
 981                         if (p[GIT_SHA1_HEXSZ] == ' ')
 982                                 name = p + GIT_SHA1_HEXSZ + 1;
 983                         else if (!p[GIT_SHA1_HEXSZ])
 984                                 name = "";
 985                         else
 986                                 die("protocol error: expected sha/ref, got %s'", p);
 987
 988                         ref = alloc_ref(name);
 989                         oidcpy(&ref->old_oid, &old_oid);
 990
 991                         *list = ref;
 992                         list = &ref->next;
 993
 994                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 995                         to_fetch[nr_heads++] = ref;
 996                 }
 997                 else
 998                         die("http transport does not support %s", buf->buf);
 999
1000                 strbuf_reset(buf);
1001                 if (strbuf_getline_lf(buf, stdin) == EOF)
1002                         return;
1003                 if (!*buf->buf)
1004                         break;
1005         } while (1);
1006
1007         if (fetch(nr_heads, to_fetch))
1008                 exit(128); /* error already reported */
1009         free_refs(list_head);
1010         free(to_fetch);
1011
1012         printf("\n");
1013         fflush(stdout);
1014         strbuf_reset(buf);
1015 }
1016
1017 static int push_dav(int nr_spec, char **specs)
1018 {
1019         struct child_process child = CHILD_PROCESS_INIT;
1020         size_t i;
1021
1022         child.git_cmd = 1;
1023         argv_array_push(&child.args, "http-push");
1024         argv_array_push(&child.args, "--helper-status");
1025         if (options.dry_run)
1026                 argv_array_push(&child.args, "--dry-run");
1027         if (options.verbosity > 1)
1028                 argv_array_push(&child.args, "--verbose");
1029         argv_array_push(&child.args, url.buf);
1030         for (i = 0; i < nr_spec; i++)
1031                 argv_array_push(&child.args, specs[i]);
1032
1033         if (run_command(&child))
1034                 die("git-http-push failed");
1035         return 0;
1036 }
1037
1038 static int push_git(struct discovery *heads, int nr_spec, char **specs)
1039 {
1040         struct rpc_state rpc;
1041         int i, err;
1042         struct argv_array args;
1043         struct string_list_item *cas_option;
1044         struct strbuf preamble = STRBUF_INIT;
1045
1046         argv_array_init(&args);
1047         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1048                          NULL);
1049
1050         if (options.thin)
1051                 argv_array_push(&args, "--thin");
1052         if (options.dry_run)
1053                 argv_array_push(&args, "--dry-run");
1054         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1055                 argv_array_push(&args, "--signed=yes");
1056         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1057                 argv_array_push(&args, "--signed=if-asked");
1058         if (options.verbosity == 0)
1059                 argv_array_push(&args, "--quiet");
1060         else if (options.verbosity > 1)
1061                 argv_array_push(&args, "--verbose");
1062         for (i = 0; i < options.push_options.nr; i++)
1063                 argv_array_pushf(&args, "--push-option=%s",
1064                                  options.push_options.items[i].string);
1065         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1066         for_each_string_list_item(cas_option, &cas_options)
1067                 argv_array_push(&args, cas_option->string);
1068         argv_array_push(&args, url.buf);
1069
1070         argv_array_push(&args, "--stdin");
1071         for (i = 0; i < nr_spec; i++)
1072                 packet_buf_write(&preamble, "%s\n", specs[i]);
1073         packet_buf_flush(&preamble);
1074
1075         memset(&rpc, 0, sizeof(rpc));
1076         rpc.service_name = "git-receive-pack",
1077         rpc.argv = args.argv;
1078         rpc.stdin_preamble = &preamble;
1079
1080         err = rpc_service(&rpc, heads);
1081         if (rpc.result.len)
1082                 write_or_die(1, rpc.result.buf, rpc.result.len);
1083         strbuf_release(&rpc.result);
1084         strbuf_release(&preamble);
1085         argv_array_clear(&args);
1086         return err;
1087 }
1088
1089 static int push(int nr_spec, char **specs)
1090 {
1091         struct discovery *heads = discover_refs("git-receive-pack", 1);
1092         int ret;
1093
1094         if (heads->proto_git)
1095                 ret = push_git(heads, nr_spec, specs);
1096         else
1097                 ret = push_dav(nr_spec, specs);
1098         free_discovery(heads);
1099         return ret;
1100 }
1101
1102 static void parse_push(struct strbuf *buf)
1103 {
1104         char **specs = NULL;
1105         int alloc_spec = 0, nr_spec = 0, i, ret;
1106
1107         do {
1108                 if (starts_with(buf->buf, "push ")) {
1109                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1110                         specs[nr_spec++] = xstrdup(buf->buf + 5);
1111                 }
1112                 else
1113                         die("http transport does not support %s", buf->buf);
1114
1115                 strbuf_reset(buf);
1116                 if (strbuf_getline_lf(buf, stdin) == EOF)
1117                         goto free_specs;
1118                 if (!*buf->buf)
1119                         break;
1120         } while (1);
1121
1122         ret = push(nr_spec, specs);
1123         printf("\n");
1124         fflush(stdout);
1125
1126         if (ret)
1127                 exit(128); /* error already reported */
1128
1129  free_specs:
1130         for (i = 0; i < nr_spec; i++)
1131                 free(specs[i]);
1132         free(specs);
1133 }
1134
1135 /*
1136  * Used to represent the state of a connection to an HTTP server when
1137  * communicating using git's wire-protocol version 2.
1138  */
1139 struct proxy_state {
1140         char *service_name;
1141         char *service_url;
1142         struct curl_slist *headers;
1143         struct strbuf request_buffer;
1144         int in;
1145         int out;
1146         struct packet_reader reader;
1147         size_t pos;
1148         int seen_flush;
1149 };
1150
1151 static void proxy_state_init(struct proxy_state *p, const char *service_name,
1152                              enum protocol_version version)
1153 {
1154         struct strbuf buf = STRBUF_INIT;
1155
1156         memset(p, 0, sizeof(*p));
1157         p->service_name = xstrdup(service_name);
1158
1159         p->in = 0;
1160         p->out = 1;
1161         strbuf_init(&p->request_buffer, 0);
1162
1163         strbuf_addf(&buf, "%s%s", url.buf, p->service_name);
1164         p->service_url = strbuf_detach(&buf, NULL);
1165
1166         p->headers = http_copy_default_headers();
1167
1168         strbuf_addf(&buf, "Content-Type: application/x-%s-request", p->service_name);
1169         p->headers = curl_slist_append(p->headers, buf.buf);
1170         strbuf_reset(&buf);
1171
1172         strbuf_addf(&buf, "Accept: application/x-%s-result", p->service_name);
1173         p->headers = curl_slist_append(p->headers, buf.buf);
1174         strbuf_reset(&buf);
1175
1176         p->headers = curl_slist_append(p->headers, "Transfer-Encoding: chunked");
1177
1178         /* Add the Git-Protocol header */
1179         if (get_protocol_http_header(version, &buf))
1180                 p->headers = curl_slist_append(p->headers, buf.buf);
1181
1182         packet_reader_init(&p->reader, p->in, NULL, 0,
1183                            PACKET_READ_GENTLE_ON_EOF);
1184
1185         strbuf_release(&buf);
1186 }
1187
1188 static void proxy_state_clear(struct proxy_state *p)
1189 {
1190         free(p->service_name);
1191         free(p->service_url);
1192         curl_slist_free_all(p->headers);
1193         strbuf_release(&p->request_buffer);
1194 }
1195
1196 /*
1197  * CURLOPT_READFUNCTION callback function.
1198  * Attempts to copy over a single packet-line at a time into the
1199  * curl provided buffer.
1200  */
1201 static size_t proxy_in(char *buffer, size_t eltsize,
1202                        size_t nmemb, void *userdata)
1203 {
1204         size_t max;
1205         struct proxy_state *p = userdata;
1206         size_t avail = p->request_buffer.len - p->pos;
1207
1208
1209         if (eltsize != 1)
1210                 BUG("curl read callback called with size = %"PRIuMAX" != 1",
1211                     (uintmax_t)eltsize);
1212         max = nmemb;
1213
1214         if (!avail) {
1215                 if (p->seen_flush) {
1216                         p->seen_flush = 0;
1217                         return 0;
1218                 }
1219
1220                 strbuf_reset(&p->request_buffer);
1221                 switch (packet_reader_read(&p->reader)) {
1222                 case PACKET_READ_EOF:
1223                         die("unexpected EOF when reading from parent process");
1224                 case PACKET_READ_NORMAL:
1225                         packet_buf_write_len(&p->request_buffer, p->reader.line,
1226                                              p->reader.pktlen);
1227                         break;
1228                 case PACKET_READ_DELIM:
1229                         packet_buf_delim(&p->request_buffer);
1230                         break;
1231                 case PACKET_READ_FLUSH:
1232                         packet_buf_flush(&p->request_buffer);
1233                         p->seen_flush = 1;
1234                         break;
1235                 }
1236                 p->pos = 0;
1237                 avail = p->request_buffer.len;
1238         }
1239
1240         if (max < avail)
1241                 avail = max;
1242         memcpy(buffer, p->request_buffer.buf + p->pos, avail);
1243         p->pos += avail;
1244         return avail;
1245 }
1246
1247 static size_t proxy_out(char *buffer, size_t eltsize,
1248                         size_t nmemb, void *userdata)
1249 {
1250         size_t size;
1251         struct proxy_state *p = userdata;
1252
1253         if (eltsize != 1)
1254                 BUG("curl read callback called with size = %"PRIuMAX" != 1",
1255                     (uintmax_t)eltsize);
1256         size = nmemb;
1257
1258         write_or_die(p->out, buffer, size);
1259         return size;
1260 }
1261
1262 /* Issues a request to the HTTP server configured in `p` */
1263 static int proxy_request(struct proxy_state *p)
1264 {
1265         struct active_request_slot *slot;
1266
1267         slot = get_active_slot();
1268
1269         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1270         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1271         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
1272         curl_easy_setopt(slot->curl, CURLOPT_URL, p->service_url);
1273         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, p->headers);
1274
1275         /* Setup function to read request from client */
1276         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, proxy_in);
1277         curl_easy_setopt(slot->curl, CURLOPT_READDATA, p);
1278
1279         /* Setup function to write server response to client */
1280         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, proxy_out);
1281         curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, p);
1282
1283         if (run_slot(slot, NULL) != HTTP_OK)
1284                 return -1;
1285
1286         return 0;
1287 }
1288
1289 static int stateless_connect(const char *service_name)
1290 {
1291         struct discovery *discover;
1292         struct proxy_state p;
1293
1294         /*
1295          * Run the info/refs request and see if the server supports protocol
1296          * v2.  If and only if the server supports v2 can we successfully
1297          * establish a stateless connection, otherwise we need to tell the
1298          * client to fallback to using other transport helper functions to
1299          * complete their request.
1300          */
1301         discover = discover_refs(service_name, 0);
1302         if (discover->version != protocol_v2) {
1303                 printf("fallback\n");
1304                 fflush(stdout);
1305                 return -1;
1306         } else {
1307                 /* Stateless Connection established */
1308                 printf("\n");
1309                 fflush(stdout);
1310         }
1311
1312         proxy_state_init(&p, service_name, discover->version);
1313
1314         /*
1315          * Dump the capability listing that we got from the server earlier
1316          * during the info/refs request.
1317          */
1318         write_or_die(p.out, discover->buf, discover->len);
1319
1320         /* Peek the next packet line.  Until we see EOF keep sending POSTs */
1321         while (packet_reader_peek(&p.reader) != PACKET_READ_EOF) {
1322                 if (proxy_request(&p)) {
1323                         /* We would have an err here */
1324                         break;
1325                 }
1326         }
1327
1328         proxy_state_clear(&p);
1329         return 0;
1330 }
1331
1332 int cmd_main(int argc, const char **argv)
1333 {
1334         struct strbuf buf = STRBUF_INIT;
1335         int nongit;
1336
1337         setup_git_directory_gently(&nongit);
1338         if (argc < 2) {
1339                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
1340                 return 1;
1341         }
1342
1343         options.verbosity = 1;
1344         options.progress = !!isatty(2);
1345         options.thin = 1;
1346         string_list_init(&options.deepen_not, 1);
1347         string_list_init(&options.push_options, 1);
1348
1349         remote = remote_get(argv[1]);
1350
1351         if (argc > 2) {
1352                 end_url_with_slash(&url, argv[2]);
1353         } else {
1354                 end_url_with_slash(&url, remote->url[0]);
1355         }
1356
1357         http_init(remote, url.buf, 0);
1358
1359         do {
1360                 const char *arg;
1361
1362                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1363                         if (ferror(stdin))
1364                                 error("remote-curl: error reading command stream from git");
1365                         return 1;
1366                 }
1367                 if (buf.len == 0)
1368                         break;
1369                 if (starts_with(buf.buf, "fetch ")) {
1370                         if (nongit)
1371                                 die("remote-curl: fetch attempted without a local repo");
1372                         parse_fetch(&buf);
1373
1374                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1375                         int for_push = !!strstr(buf.buf + 4, "for-push");
1376                         output_refs(get_refs(for_push));
1377
1378                 } else if (starts_with(buf.buf, "push ")) {
1379                         parse_push(&buf);
1380
1381                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1382                         char *value = strchr(arg, ' ');
1383                         int result;
1384
1385                         if (value)
1386                                 *value++ = '\0';
1387                         else
1388                                 value = "true";
1389
1390                         result = set_option(arg, value);
1391                         if (!result)
1392                                 printf("ok\n");
1393                         else if (result < 0)
1394                                 printf("error invalid value\n");
1395                         else
1396                                 printf("unsupported\n");
1397                         fflush(stdout);
1398
1399                 } else if (!strcmp(buf.buf, "capabilities")) {
1400                         printf("stateless-connect\n");
1401                         printf("fetch\n");
1402                         printf("option\n");
1403                         printf("push\n");
1404                         printf("check-connectivity\n");
1405                         printf("\n");
1406                         fflush(stdout);
1407                 } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1408                         if (!stateless_connect(arg))
1409                                 break;
1410                 } else {
1411                         error("remote-curl: unknown command '%s' from git", buf.buf);
1412                         return 1;
1413                 }
1414                 strbuf_reset(&buf);
1415         } while (1);
1416
1417         http_cleanup();
1418
1419         return 0;
1420 }