remote-curl.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "remote.h"
   4 #include "connect.h"
   5 #include "strbuf.h"
   6 #include "walker.h"
   7 #include "http.h"
   8 #include "exec-cmd.h"
   9 #include "run-command.h"
  10 #include "pkt-line.h"
  11 #include "string-list.h"
  12 #include "sideband.h"
  13 #include "argv-array.h"
  14 #include "credential.h"
  15 #include "sha1-array.h"
  16 #include "send-pack.h"
  17 #include "protocol.h"
  18 #include "quote.h"
  19
  20 static struct remote *remote;
  21 /* always ends with a trailing slash */
  22 static struct strbuf url = STRBUF_INIT;
  23
  24 struct options {
  25         int verbosity;
  26         unsigned long depth;
  27         char *deepen_since;
  28         struct string_list deepen_not;
  29         struct string_list push_options;
  30         char *filter;
  31         unsigned progress : 1,
  32                 check_self_contained_and_connected : 1,
  33                 cloning : 1,
  34                 update_shallow : 1,
  35                 followtags : 1,
  36                 dry_run : 1,
  37                 thin : 1,
  38                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
  39                 push_cert : 2,
  40                 deepen_relative : 1,
  41                 from_promisor : 1,
  42                 no_dependents : 1;
  43 };
  44 static struct options options;
  45 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  46
  47 static int set_option(const char *name, const char *value)
  48 {
  49         if (!strcmp(name, "verbosity")) {
  50                 char *end;
  51                 int v = strtol(value, &end, 10);
  52                 if (value == end || *end)
  53                         return -1;
  54                 options.verbosity = v;
  55                 return 0;
  56         }
  57         else if (!strcmp(name, "progress")) {
  58                 if (!strcmp(value, "true"))
  59                         options.progress = 1;
  60                 else if (!strcmp(value, "false"))
  61                         options.progress = 0;
  62                 else
  63                         return -1;
  64                 return 0;
  65         }
  66         else if (!strcmp(name, "depth")) {
  67                 char *end;
  68                 unsigned long v = strtoul(value, &end, 10);
  69                 if (value == end || *end)
  70                         return -1;
  71                 options.depth = v;
  72                 return 0;
  73         }
  74         else if (!strcmp(name, "deepen-since")) {
  75                 options.deepen_since = xstrdup(value);
  76                 return 0;
  77         }
  78         else if (!strcmp(name, "deepen-not")) {
  79                 string_list_append(&options.deepen_not, value);
  80                 return 0;
  81         }
  82         else if (!strcmp(name, "deepen-relative")) {
  83                 if (!strcmp(value, "true"))
  84                         options.deepen_relative = 1;
  85                 else if (!strcmp(value, "false"))
  86                         options.deepen_relative = 0;
  87                 else
  88                         return -1;
  89                 return 0;
  90         }
  91         else if (!strcmp(name, "followtags")) {
  92                 if (!strcmp(value, "true"))
  93                         options.followtags = 1;
  94                 else if (!strcmp(value, "false"))
  95                         options.followtags = 0;
  96                 else
  97                         return -1;
  98                 return 0;
  99         }
 100         else if (!strcmp(name, "dry-run")) {
 101                 if (!strcmp(value, "true"))
 102                         options.dry_run = 1;
 103                 else if (!strcmp(value, "false"))
 104                         options.dry_run = 0;
 105                 else
 106                         return -1;
 107                 return 0;
 108         }
 109         else if (!strcmp(name, "check-connectivity")) {
 110                 if (!strcmp(value, "true"))
 111                         options.check_self_contained_and_connected = 1;
 112                 else if (!strcmp(value, "false"))
 113                         options.check_self_contained_and_connected = 0;
 114                 else
 115                         return -1;
 116                 return 0;
 117         }
 118         else if (!strcmp(name, "cas")) {
 119                 struct strbuf val = STRBUF_INIT;
 120                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 121                 string_list_append(&cas_options, val.buf);
 122                 strbuf_release(&val);
 123                 return 0;
 124         } else if (!strcmp(name, "cloning")) {
 125                 if (!strcmp(value, "true"))
 126                         options.cloning = 1;
 127                 else if (!strcmp(value, "false"))
 128                         options.cloning = 0;
 129                 else
 130                         return -1;
 131                 return 0;
 132         } else if (!strcmp(name, "update-shallow")) {
 133                 if (!strcmp(value, "true"))
 134                         options.update_shallow = 1;
 135                 else if (!strcmp(value, "false"))
 136                         options.update_shallow = 0;
 137                 else
 138                         return -1;
 139                 return 0;
 140         } else if (!strcmp(name, "pushcert")) {
 141                 if (!strcmp(value, "true"))
 142                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 143                 else if (!strcmp(value, "false"))
 144                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 145                 else if (!strcmp(value, "if-asked"))
 146                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 147                 else
 148                         return -1;
 149                 return 0;
 150         } else if (!strcmp(name, "push-option")) {
 151                 if (*value != '"')
 152                         string_list_append(&options.push_options, value);
 153                 else {
 154                         struct strbuf unquoted = STRBUF_INIT;
 155                         if (unquote_c_style(&unquoted, value, NULL) < 0)
 156                                 die("invalid quoting in push-option value");
 157                         string_list_append_nodup(&options.push_options,
 158                                                  strbuf_detach(&unquoted, NULL));
 159                 }
 160                 return 0;
 161
 162 #if LIBCURL_VERSION_NUM >= 0x070a08
 163         } else if (!strcmp(name, "family")) {
 164                 if (!strcmp(value, "ipv4"))
 165                         git_curl_ipresolve = CURL_IPRESOLVE_V4;
 166                 else if (!strcmp(value, "ipv6"))
 167                         git_curl_ipresolve = CURL_IPRESOLVE_V6;
 168                 else if (!strcmp(value, "all"))
 169                         git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 170                 else
 171                         return -1;
 172                 return 0;
 173 #endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 174         } else if (!strcmp(name, "from-promisor")) {
 175                 options.from_promisor = 1;
 176                 return 0;
 177         } else if (!strcmp(name, "no-dependents")) {
 178                 options.no_dependents = 1;
 179                 return 0;
 180         } else if (!strcmp(name, "filter")) {
 181                 options.filter = xstrdup(value);
 182                 return 0;
 183         } else {
 184                 return 1 /* unsupported */;
 185         }
 186 }
 187
 188 struct discovery {
 189         char *service;
 190         char *buf_alloc;
 191         char *buf;
 192         size_t len;
 193         struct ref *refs;
 194         struct oid_array shallow;
 195         enum protocol_version version;
 196         unsigned proto_git : 1;
 197 };
 198 static struct discovery *last_discovery;
 199
 200 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 201 {
 202         struct ref *list = NULL;
 203         struct packet_reader reader;
 204
 205         packet_reader_init(&reader, -1, heads->buf, heads->len,
 206                            PACKET_READ_CHOMP_NEWLINE |
 207                            PACKET_READ_GENTLE_ON_EOF |
 208                            PACKET_READ_DIE_ON_ERR_PACKET);
 209
 210         heads->version = discover_version(&reader);
 211         switch (heads->version) {
 212         case protocol_v2:
 213                 /*
 214                  * Do nothing.  This isn't a list of refs but rather a
 215                  * capability advertisement.  Client would have run
 216                  * 'stateless-connect' so we'll dump this capability listing
 217                  * and let them request the refs themselves.
 218                  */
 219                 break;
 220         case protocol_v1:
 221         case protocol_v0:
 222                 get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
 223                                  NULL, &heads->shallow);
 224                 break;
 225         case protocol_unknown_version:
 226                 BUG("unknown protocol version");
 227         }
 228
 229         return list;
 230 }
 231
 232 static struct ref *parse_info_refs(struct discovery *heads)
 233 {
 234         char *data, *start, *mid;
 235         char *ref_name;
 236         int i = 0;
 237
 238         struct ref *refs = NULL;
 239         struct ref *ref = NULL;
 240         struct ref *last_ref = NULL;
 241
 242         data = heads->buf;
 243         start = NULL;
 244         mid = data;
 245         while (i < heads->len) {
 246                 if (!start) {
 247                         start = &data[i];
 248                 }
 249                 if (data[i] == '\t')
 250                         mid = &data[i];
 251                 if (data[i] == '\n') {
 252                         if (mid - start != 40)
 253                                 die("%sinfo/refs not valid: is this a git repository?",
 254                                     url.buf);
 255                         data[i] = 0;
 256                         ref_name = mid + 1;
 257                         ref = alloc_ref(ref_name);
 258                         get_oid_hex(start, &ref->old_oid);
 259                         if (!refs)
 260                                 refs = ref;
 261                         if (last_ref)
 262                                 last_ref->next = ref;
 263                         last_ref = ref;
 264                         start = NULL;
 265                 }
 266                 i++;
 267         }
 268
 269         ref = alloc_ref("HEAD");
 270         if (!http_fetch_ref(url.buf, ref) &&
 271             !resolve_remote_symref(ref, refs)) {
 272                 ref->next = refs;
 273                 refs = ref;
 274         } else {
 275                 free(ref);
 276         }
 277
 278         return refs;
 279 }
 280
 281 static void free_discovery(struct discovery *d)
 282 {
 283         if (d) {
 284                 if (d == last_discovery)
 285                         last_discovery = NULL;
 286                 free(d->shallow.oid);
 287                 free(d->buf_alloc);
 288                 free_refs(d->refs);
 289                 free(d->service);
 290                 free(d);
 291         }
 292 }
 293
 294 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 295                              struct strbuf *msg)
 296 {
 297         const char *p, *eol;
 298
 299         /*
 300          * We only show text/plain parts, as other types are likely
 301          * to be ugly to look at on the user's terminal.
 302          */
 303         if (strcmp(type->buf, "text/plain"))
 304                 return -1;
 305         if (charset->len)
 306                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 307
 308         strbuf_trim(msg);
 309         if (!msg->len)
 310                 return -1;
 311
 312         p = msg->buf;
 313         do {
 314                 eol = strchrnul(p, '\n');
 315                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 316                 p = eol + 1;
 317         } while(*eol);
 318         return 0;
 319 }
 320
 321 static int get_protocol_http_header(enum protocol_version version,
 322                                     struct strbuf *header)
 323 {
 324         if (version > 0) {
 325                 strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
 326                             version);
 327
 328                 return 1;
 329         }
 330
 331         return 0;
 332 }
 333
 334 static struct discovery *discover_refs(const char *service, int for_push)
 335 {
 336         struct strbuf exp = STRBUF_INIT;
 337         struct strbuf type = STRBUF_INIT;
 338         struct strbuf charset = STRBUF_INIT;
 339         struct strbuf buffer = STRBUF_INIT;
 340         struct strbuf refs_url = STRBUF_INIT;
 341         struct strbuf effective_url = STRBUF_INIT;
 342         struct strbuf protocol_header = STRBUF_INIT;
 343         struct string_list extra_headers = STRING_LIST_INIT_DUP;
 344         struct discovery *last = last_discovery;
 345         int http_ret, maybe_smart = 0;
 346         struct http_get_options http_options;
 347         enum protocol_version version = get_protocol_version_config();
 348
 349         if (last && !strcmp(service, last->service))
 350                 return last;
 351         free_discovery(last);
 352
 353         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 354         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 355              git_env_bool("GIT_SMART_HTTP", 1)) {
 356                 maybe_smart = 1;
 357                 if (!strchr(url.buf, '?'))
 358                         strbuf_addch(&refs_url, '?');
 359                 else
 360                         strbuf_addch(&refs_url, '&');
 361                 strbuf_addf(&refs_url, "service=%s", service);
 362         }
 363
 364         /*
 365          * NEEDSWORK: If we are trying to use protocol v2 and we are planning
 366          * to perform a push, then fallback to v0 since the client doesn't know
 367          * how to push yet using v2.
 368          */
 369         if (version == protocol_v2 && !strcmp("git-receive-pack", service))
 370                 version = protocol_v0;
 371
 372         /* Add the extra Git-Protocol header */
 373         if (get_protocol_http_header(version, &protocol_header))
 374                 string_list_append(&extra_headers, protocol_header.buf);
 375
 376         memset(&http_options, 0, sizeof(http_options));
 377         http_options.content_type = &type;
 378         http_options.charset = &charset;
 379         http_options.effective_url = &effective_url;
 380         http_options.base_url = &url;
 381         http_options.extra_headers = &extra_headers;
 382         http_options.initial_request = 1;
 383         http_options.no_cache = 1;
 384         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", url.buf);
 393         case HTTP_NOAUTH:
 394                 show_http_message(&type, &charset, &buffer);
 395                 die("Authentication failed for '%s'", url.buf);
 396         default:
 397                 show_http_message(&type, &charset, &buffer);
 398                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 399         }
 400
 401         if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 402                 warning(_("redirecting to %s"), url.buf);
 403
 404         last= xcalloc(1, sizeof(*last_discovery));
 405         last->service = xstrdup(service);
 406         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 407         last->buf = last->buf_alloc;
 408
 409         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 410         if (maybe_smart &&
 411             (5 <= last->len && last->buf[4] == '#') &&
 412             !strbuf_cmp(&exp, &type)) {
 413                 struct packet_reader reader;
 414                 packet_reader_init(&reader, -1, last->buf, last->len,
 415                                    PACKET_READ_CHOMP_NEWLINE |
 416                                    PACKET_READ_DIE_ON_ERR_PACKET);
 417
 418                 /*
 419                  * smart HTTP response; validate that the service
 420                  * pkt-line matches our request.
 421                  */
 422                 if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
 423                         die("invalid server response; expected service, got flush packet");
 424
 425                 strbuf_reset(&exp);
 426                 strbuf_addf(&exp, "# service=%s", service);
 427                 if (strcmp(reader.line, exp.buf))
 428                         die("invalid server response; got '%s'", reader.line);
 429                 strbuf_release(&exp);
 430
 431                 /* The header can include additional metadata lines, up
 432                  * until a packet flush marker.  Ignore these now, but
 433                  * in the future we might start to scan them.
 434                  */
 435                 for (;;) {
 436                         packet_reader_read(&reader);
 437                         if (reader.pktlen <= 0) {
 438                                 break;
 439                         }
 440                 }
 441
 442                 last->buf = reader.src_buffer;
 443                 last->len = reader.src_len;
 444
 445                 last->proto_git = 1;
 446         } else if (maybe_smart &&
 447                    last->len > 5 && starts_with(last->buf + 4, "version 2")) {
 448                 last->proto_git = 1;
 449         }
 450
 451         if (last->proto_git)
 452                 last->refs = parse_git_refs(last, for_push);
 453         else
 454                 last->refs = parse_info_refs(last);
 455
 456         strbuf_release(&refs_url);
 457         strbuf_release(&exp);
 458         strbuf_release(&type);
 459         strbuf_release(&charset);
 460         strbuf_release(&effective_url);
 461         strbuf_release(&buffer);
 462         strbuf_release(&protocol_header);
 463         string_list_clear(&extra_headers, 0);
 464         last_discovery = last;
 465         return last;
 466 }
 467
 468 static struct ref *get_refs(int for_push)
 469 {
 470         struct discovery *heads;
 471
 472         if (for_push)
 473                 heads = discover_refs("git-receive-pack", for_push);
 474         else
 475                 heads = discover_refs("git-upload-pack", for_push);
 476
 477         return heads->refs;
 478 }
 479
 480 static void output_refs(struct ref *refs)
 481 {
 482         struct ref *posn;
 483         for (posn = refs; posn; posn = posn->next) {
 484                 if (posn->symref)
 485                         printf("@%s %s\n", posn->symref, posn->name);
 486                 else
 487                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 488         }
 489         printf("\n");
 490         fflush(stdout);
 491 }
 492
 493 struct rpc_state {
 494         const char *service_name;
 495         const char **argv;
 496         struct strbuf *stdin_preamble;
 497         char *service_url;
 498         char *hdr_content_type;
 499         char *hdr_accept;
 500         char *protocol_header;
 501         char *buf;
 502         size_t alloc;
 503         size_t len;
 504         size_t pos;
 505         int in;
 506         int out;
 507         int any_written;
 508         struct strbuf result;
 509         unsigned gzip_request : 1;
 510         unsigned initial_buffer : 1;
 511 };
 512
 513 static size_t rpc_out(void *ptr, size_t eltsize,
 514                 size_t nmemb, void *buffer_)
 515 {
 516         size_t max = eltsize * nmemb;
 517         struct rpc_state *rpc = buffer_;
 518         size_t avail = rpc->len - rpc->pos;
 519
 520         if (!avail) {
 521                 rpc->initial_buffer = 0;
 522                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 523                 if (!avail)
 524                         return 0;
 525                 rpc->pos = 0;
 526                 rpc->len = avail;
 527         }
 528
 529         if (max < avail)
 530                 avail = max;
 531         memcpy(ptr, rpc->buf + rpc->pos, avail);
 532         rpc->pos += avail;
 533         return avail;
 534 }
 535
 536 #ifndef NO_CURL_IOCTL
 537 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 538 {
 539         struct rpc_state *rpc = clientp;
 540
 541         switch (cmd) {
 542         case CURLIOCMD_NOP:
 543                 return CURLIOE_OK;
 544
 545         case CURLIOCMD_RESTARTREAD:
 546                 if (rpc->initial_buffer) {
 547                         rpc->pos = 0;
 548                         return CURLIOE_OK;
 549                 }
 550                 error("unable to rewind rpc post data - try increasing http.postBuffer");
 551                 return CURLIOE_FAILRESTART;
 552
 553         default:
 554                 return CURLIOE_UNKNOWNCMD;
 555         }
 556 }
 557 #endif
 558
 559 static size_t rpc_in(char *ptr, size_t eltsize,
 560                 size_t nmemb, void *buffer_)
 561 {
 562         size_t size = eltsize * nmemb;
 563         struct rpc_state *rpc = buffer_;
 564         if (size)
 565                 rpc->any_written = 1;
 566         write_or_die(rpc->in, ptr, size);
 567         return size;
 568 }
 569
 570 static int run_slot(struct active_request_slot *slot,
 571                     struct slot_results *results)
 572 {
 573         int err;
 574         struct slot_results results_buf;
 575
 576         if (!results)
 577                 results = &results_buf;
 578
 579         err = run_one_slot(slot, results);
 580
 581         if (err != HTTP_OK && err != HTTP_REAUTH) {
 582                 struct strbuf msg = STRBUF_INIT;
 583                 if (results->http_code && results->http_code != 200)
 584                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 585                 if (results->curl_result != CURLE_OK) {
 586                         if (msg.len)
 587                                 strbuf_addch(&msg, ' ');
 588                         strbuf_addf(&msg, "curl %d", results->curl_result);
 589                         if (curl_errorstr[0]) {
 590                                 strbuf_addch(&msg, ' ');
 591                                 strbuf_addstr(&msg, curl_errorstr);
 592                         }
 593                 }
 594                 error("RPC failed; %s", msg.buf);
 595                 strbuf_release(&msg);
 596         }
 597
 598         return err;
 599 }
 600
 601 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 602 {
 603         struct active_request_slot *slot;
 604         struct curl_slist *headers = http_copy_default_headers();
 605         struct strbuf buf = STRBUF_INIT;
 606         int err;
 607
 608         slot = get_active_slot();
 609
 610         headers = curl_slist_append(headers, rpc->hdr_content_type);
 611         headers = curl_slist_append(headers, rpc->hdr_accept);
 612
 613         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 614         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 615         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 616         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 617         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 618         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 619         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 620         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 621         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 622
 623         err = run_slot(slot, results);
 624
 625         curl_slist_free_all(headers);
 626         strbuf_release(&buf);
 627         return err;
 628 }
 629
 630 static curl_off_t xcurl_off_t(size_t len) {
 631         uintmax_t size = len;
 632         if (size > maximum_signed_value_of_type(curl_off_t))
 633                 die("cannot handle pushes this big");
 634         return (curl_off_t)size;
 635 }
 636
 637 static int post_rpc(struct rpc_state *rpc)
 638 {
 639         struct active_request_slot *slot;
 640         struct curl_slist *headers = http_copy_default_headers();
 641         int use_gzip = rpc->gzip_request;
 642         char *gzip_body = NULL;
 643         size_t gzip_size = 0;
 644         int err, large_request = 0;
 645         int needs_100_continue = 0;
 646
 647         /* Try to load the entire request, if we can fit it into the
 648          * allocated buffer space we can use HTTP/1.0 and avoid the
 649          * chunked encoding mess.
 650          */
 651         while (1) {
 652                 size_t left = rpc->alloc - rpc->len;
 653                 char *buf = rpc->buf + rpc->len;
 654                 int n;
 655
 656                 if (left < LARGE_PACKET_MAX) {
 657                         large_request = 1;
 658                         use_gzip = 0;
 659                         break;
 660                 }
 661
 662                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 663                 if (!n)
 664                         break;
 665                 rpc->len += n;
 666         }
 667
 668         if (large_request) {
 669                 struct slot_results results;
 670
 671                 do {
 672                         err = probe_rpc(rpc, &results);
 673                         if (err == HTTP_REAUTH)
 674                                 credential_fill(&http_auth);
 675                 } while (err == HTTP_REAUTH);
 676                 if (err != HTTP_OK)
 677                         return -1;
 678
 679                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 680                         needs_100_continue = 1;
 681         }
 682
 683         headers = curl_slist_append(headers, rpc->hdr_content_type);
 684         headers = curl_slist_append(headers, rpc->hdr_accept);
 685         headers = curl_slist_append(headers, needs_100_continue ?
 686                 "Expect: 100-continue" : "Expect:");
 687
 688         /* Add the extra Git-Protocol header */
 689         if (rpc->protocol_header)
 690                 headers = curl_slist_append(headers, rpc->protocol_header);
 691
 692 retry:
 693         slot = get_active_slot();
 694
 695         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 696         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 697         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 698         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 699
 700         if (large_request) {
 701                 /* The request body is large and the size cannot be predicted.
 702                  * We must use chunked encoding to send it.
 703                  */
 704                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 705                 rpc->initial_buffer = 1;
 706                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 707                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 708 #ifndef NO_CURL_IOCTL
 709                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 710                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 711 #endif
 712                 if (options.verbosity > 1) {
 713                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 714                         fflush(stderr);
 715                 }
 716
 717         } else if (gzip_body) {
 718                 /*
 719                  * If we are looping to retry authentication, then the previous
 720                  * run will have set up the headers and gzip buffer already,
 721                  * and we just need to send it.
 722                  */
 723                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 724                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 725
 726         } else if (use_gzip && 1024 < rpc->len) {
 727                 /* The client backend isn't giving us compressed data so
 728                  * we can try to deflate it ourselves, this may save on
 729                  * the transfer time.
 730                  */
 731                 git_zstream stream;
 732                 int ret;
 733
 734                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 735                 gzip_size = git_deflate_bound(&stream, rpc->len);
 736                 gzip_body = xmalloc(gzip_size);
 737
 738                 stream.next_in = (unsigned char *)rpc->buf;
 739                 stream.avail_in = rpc->len;
 740                 stream.next_out = (unsigned char *)gzip_body;
 741                 stream.avail_out = gzip_size;
 742
 743                 ret = git_deflate(&stream, Z_FINISH);
 744                 if (ret != Z_STREAM_END)
 745                         die("cannot deflate request; zlib deflate error %d", ret);
 746
 747                 ret = git_deflate_end_gently(&stream);
 748                 if (ret != Z_OK)
 749                         die("cannot deflate request; zlib end error %d", ret);
 750
 751                 gzip_size = stream.total_out;
 752
 753                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 754                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 755                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 756
 757                 if (options.verbosity > 1) {
 758                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 759                                 rpc->service_name,
 760                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 761                         fflush(stderr);
 762                 }
 763         } else {
 764                 /* We know the complete request size in advance, use the
 765                  * more normal Content-Length approach.
 766                  */
 767                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 768                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 769                 if (options.verbosity > 1) {
 770                         fprintf(stderr, "POST %s (%lu bytes)\n",
 771                                 rpc->service_name, (unsigned long)rpc->len);
 772                         fflush(stderr);
 773                 }
 774         }
 775
 776         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 777         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 778         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 779
 780
 781         rpc->any_written = 0;
 782         err = run_slot(slot, NULL);
 783         if (err == HTTP_REAUTH && !large_request) {
 784                 credential_fill(&http_auth);
 785                 goto retry;
 786         }
 787         if (err != HTTP_OK)
 788                 err = -1;
 789
 790         if (!rpc->any_written)
 791                 err = -1;
 792
 793         curl_slist_free_all(headers);
 794         free(gzip_body);
 795         return err;
 796 }
 797
 798 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 799 {
 800         const char *svc = rpc->service_name;
 801         struct strbuf buf = STRBUF_INIT;
 802         struct strbuf *preamble = rpc->stdin_preamble;
 803         struct child_process client = CHILD_PROCESS_INIT;
 804         int err = 0;
 805
 806         client.in = -1;
 807         client.out = -1;
 808         client.git_cmd = 1;
 809         client.argv = rpc->argv;
 810         if (start_command(&client))
 811                 exit(1);
 812         if (preamble)
 813                 write_or_die(client.in, preamble->buf, preamble->len);
 814         if (heads)
 815                 write_or_die(client.in, heads->buf, heads->len);
 816
 817         rpc->alloc = http_post_buffer;
 818         rpc->buf = xmalloc(rpc->alloc);
 819         rpc->in = client.in;
 820         rpc->out = client.out;
 821         strbuf_init(&rpc->result, 0);
 822
 823         strbuf_addf(&buf, "%s%s", url.buf, svc);
 824         rpc->service_url = strbuf_detach(&buf, NULL);
 825
 826         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 827         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 828
 829         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 830         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 831
 832         if (get_protocol_http_header(heads->version, &buf))
 833                 rpc->protocol_header = strbuf_detach(&buf, NULL);
 834         else
 835                 rpc->protocol_header = NULL;
 836
 837         while (!err) {
 838                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 839                 if (!n)
 840                         break;
 841                 rpc->pos = 0;
 842                 rpc->len = n;
 843                 err |= post_rpc(rpc);
 844         }
 845
 846         close(client.in);
 847         client.in = -1;
 848         if (!err) {
 849                 strbuf_read(&rpc->result, client.out, 0);
 850         } else {
 851                 char buf[4096];
 852                 for (;;)
 853                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 854                                 break;
 855         }
 856
 857         close(client.out);
 858         client.out = -1;
 859
 860         err |= finish_command(&client);
 861         free(rpc->service_url);
 862         free(rpc->hdr_content_type);
 863         free(rpc->hdr_accept);
 864         free(rpc->protocol_header);
 865         free(rpc->buf);
 866         strbuf_release(&buf);
 867         return err;
 868 }
 869
 870 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 871 {
 872         struct walker *walker;
 873         char **targets;
 874         int ret, i;
 875
 876         ALLOC_ARRAY(targets, nr_heads);
 877         if (options.depth || options.deepen_since)
 878                 die("dumb http transport does not support shallow capabilities");
 879         for (i = 0; i < nr_heads; i++)
 880                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 881
 882         walker = get_http_walker(url.buf);
 883         walker->get_verbosely = options.verbosity >= 3;
 884         walker->get_recover = 0;
 885         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 886         walker_free(walker);
 887
 888         for (i = 0; i < nr_heads; i++)
 889                 free(targets[i]);
 890         free(targets);
 891
 892         return ret ? error("fetch failed.") : 0;
 893 }
 894
 895 static int fetch_git(struct discovery *heads,
 896         int nr_heads, struct ref **to_fetch)
 897 {
 898         struct rpc_state rpc;
 899         struct strbuf preamble = STRBUF_INIT;
 900         int i, err;
 901         struct argv_array args = ARGV_ARRAY_INIT;
 902
 903         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 904                          "--stdin", "--lock-pack", NULL);
 905         if (options.followtags)
 906                 argv_array_push(&args, "--include-tag");
 907         if (options.thin)
 908                 argv_array_push(&args, "--thin");
 909         if (options.verbosity >= 3)
 910                 argv_array_pushl(&args, "-v", "-v", NULL);
 911         if (options.check_self_contained_and_connected)
 912                 argv_array_push(&args, "--check-self-contained-and-connected");
 913         if (options.cloning)
 914                 argv_array_push(&args, "--cloning");
 915         if (options.update_shallow)
 916                 argv_array_push(&args, "--update-shallow");
 917         if (!options.progress)
 918                 argv_array_push(&args, "--no-progress");
 919         if (options.depth)
 920                 argv_array_pushf(&args, "--depth=%lu", options.depth);
 921         if (options.deepen_since)
 922                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 923         for (i = 0; i < options.deepen_not.nr; i++)
 924                 argv_array_pushf(&args, "--shallow-exclude=%s",
 925                                  options.deepen_not.items[i].string);
 926         if (options.deepen_relative && options.depth)
 927                 argv_array_push(&args, "--deepen-relative");
 928         if (options.from_promisor)
 929                 argv_array_push(&args, "--from-promisor");
 930         if (options.no_dependents)
 931                 argv_array_push(&args, "--no-dependents");
 932         if (options.filter)
 933                 argv_array_pushf(&args, "--filter=%s", options.filter);
 934         argv_array_push(&args, url.buf);
 935
 936         for (i = 0; i < nr_heads; i++) {
 937                 struct ref *ref = to_fetch[i];
 938                 if (!*ref->name)
 939                         die("cannot fetch by sha1 over smart http");
 940                 packet_buf_write(&preamble, "%s %s\n",
 941                                  oid_to_hex(&ref->old_oid), ref->name);
 942         }
 943         packet_buf_flush(&preamble);
 944
 945         memset(&rpc, 0, sizeof(rpc));
 946         rpc.service_name = "git-upload-pack",
 947         rpc.argv = args.argv;
 948         rpc.stdin_preamble = &preamble;
 949         rpc.gzip_request = 1;
 950
 951         err = rpc_service(&rpc, heads);
 952         if (rpc.result.len)
 953                 write_or_die(1, rpc.result.buf, rpc.result.len);
 954         strbuf_release(&rpc.result);
 955         strbuf_release(&preamble);
 956         argv_array_clear(&args);
 957         return err;
 958 }
 959
 960 static int fetch(int nr_heads, struct ref **to_fetch)
 961 {
 962         struct discovery *d = discover_refs("git-upload-pack", 0);
 963         if (d->proto_git)
 964                 return fetch_git(d, nr_heads, to_fetch);
 965         else
 966                 return fetch_dumb(nr_heads, to_fetch);
 967 }
 968
 969 static void parse_fetch(struct strbuf *buf)
 970 {
 971         struct ref **to_fetch = NULL;
 972         struct ref *list_head = NULL;
 973         struct ref **list = &list_head;
 974         int alloc_heads = 0, nr_heads = 0;
 975
 976         do {
 977                 const char *p;
 978                 if (skip_prefix(buf->buf, "fetch ", &p)) {
 979                         const char *name;
 980                         struct ref *ref;
 981                         struct object_id old_oid;
 982
 983                         if (get_oid_hex(p, &old_oid))
 984                                 die("protocol error: expected sha/ref, got %s'", p);
 985                         if (p[GIT_SHA1_HEXSZ] == ' ')
 986                                 name = p + GIT_SHA1_HEXSZ + 1;
 987                         else if (!p[GIT_SHA1_HEXSZ])
 988                                 name = "";
 989                         else
 990                                 die("protocol error: expected sha/ref, got %s'", p);
 991
 992                         ref = alloc_ref(name);
 993                         oidcpy(&ref->old_oid, &old_oid);
 994
 995                         *list = ref;
 996                         list = &ref->next;
 997
 998                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 999                         to_fetch[nr_heads++] = ref;
1000                 }
1001                 else
1002                         die("http transport does not support %s", buf->buf);
1003
1004                 strbuf_reset(buf);
1005                 if (strbuf_getline_lf(buf, stdin) == EOF)
1006                         return;
1007                 if (!*buf->buf)
1008                         break;
1009         } while (1);
1010
1011         if (fetch(nr_heads, to_fetch))
1012                 exit(128); /* error already reported */
1013         free_refs(list_head);
1014         free(to_fetch);
1015
1016         printf("\n");
1017         fflush(stdout);
1018         strbuf_reset(buf);
1019 }
1020
1021 static int push_dav(int nr_spec, char **specs)
1022 {
1023         struct child_process child = CHILD_PROCESS_INIT;
1024         size_t i;
1025
1026         child.git_cmd = 1;
1027         argv_array_push(&child.args, "http-push");
1028         argv_array_push(&child.args, "--helper-status");
1029         if (options.dry_run)
1030                 argv_array_push(&child.args, "--dry-run");
1031         if (options.verbosity > 1)
1032                 argv_array_push(&child.args, "--verbose");
1033         argv_array_push(&child.args, url.buf);
1034         for (i = 0; i < nr_spec; i++)
1035                 argv_array_push(&child.args, specs[i]);
1036
1037         if (run_command(&child))
1038                 die("git-http-push failed");
1039         return 0;
1040 }
1041
1042 static int push_git(struct discovery *heads, int nr_spec, char **specs)
1043 {
1044         struct rpc_state rpc;
1045         int i, err;
1046         struct argv_array args;
1047         struct string_list_item *cas_option;
1048         struct strbuf preamble = STRBUF_INIT;
1049
1050         argv_array_init(&args);
1051         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1052                          NULL);
1053
1054         if (options.thin)
1055                 argv_array_push(&args, "--thin");
1056         if (options.dry_run)
1057                 argv_array_push(&args, "--dry-run");
1058         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1059                 argv_array_push(&args, "--signed=yes");
1060         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1061                 argv_array_push(&args, "--signed=if-asked");
1062         if (options.verbosity == 0)
1063                 argv_array_push(&args, "--quiet");
1064         else if (options.verbosity > 1)
1065                 argv_array_push(&args, "--verbose");
1066         for (i = 0; i < options.push_options.nr; i++)
1067                 argv_array_pushf(&args, "--push-option=%s",
1068                                  options.push_options.items[i].string);
1069         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1070         for_each_string_list_item(cas_option, &cas_options)
1071                 argv_array_push(&args, cas_option->string);
1072         argv_array_push(&args, url.buf);
1073
1074         argv_array_push(&args, "--stdin");
1075         for (i = 0; i < nr_spec; i++)
1076                 packet_buf_write(&preamble, "%s\n", specs[i]);
1077         packet_buf_flush(&preamble);
1078
1079         memset(&rpc, 0, sizeof(rpc));
1080         rpc.service_name = "git-receive-pack",
1081         rpc.argv = args.argv;
1082         rpc.stdin_preamble = &preamble;
1083
1084         err = rpc_service(&rpc, heads);
1085         if (rpc.result.len)
1086                 write_or_die(1, rpc.result.buf, rpc.result.len);
1087         strbuf_release(&rpc.result);
1088         strbuf_release(&preamble);
1089         argv_array_clear(&args);
1090         return err;
1091 }
1092
1093 static int push(int nr_spec, char **specs)
1094 {
1095         struct discovery *heads = discover_refs("git-receive-pack", 1);
1096         int ret;
1097
1098         if (heads->proto_git)
1099                 ret = push_git(heads, nr_spec, specs);
1100         else
1101                 ret = push_dav(nr_spec, specs);
1102         free_discovery(heads);
1103         return ret;
1104 }
1105
1106 static void parse_push(struct strbuf *buf)
1107 {
1108         char **specs = NULL;
1109         int alloc_spec = 0, nr_spec = 0, i, ret;
1110
1111         do {
1112                 if (starts_with(buf->buf, "push ")) {
1113                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1114                         specs[nr_spec++] = xstrdup(buf->buf + 5);
1115                 }
1116                 else
1117                         die("http transport does not support %s", buf->buf);
1118
1119                 strbuf_reset(buf);
1120                 if (strbuf_getline_lf(buf, stdin) == EOF)
1121                         goto free_specs;
1122                 if (!*buf->buf)
1123                         break;
1124         } while (1);
1125
1126         ret = push(nr_spec, specs);
1127         printf("\n");
1128         fflush(stdout);
1129
1130         if (ret)
1131                 exit(128); /* error already reported */
1132
1133  free_specs:
1134         for (i = 0; i < nr_spec; i++)
1135                 free(specs[i]);
1136         free(specs);
1137 }
1138
1139 /*
1140  * Used to represent the state of a connection to an HTTP server when
1141  * communicating using git's wire-protocol version 2.
1142  */
1143 struct proxy_state {
1144         char *service_name;
1145         char *service_url;
1146         struct curl_slist *headers;
1147         struct strbuf request_buffer;
1148         int in;
1149         int out;
1150         struct packet_reader reader;
1151         size_t pos;
1152         int seen_flush;
1153 };
1154
1155 static void proxy_state_init(struct proxy_state *p, const char *service_name,
1156                              enum protocol_version version)
1157 {
1158         struct strbuf buf = STRBUF_INIT;
1159
1160         memset(p, 0, sizeof(*p));
1161         p->service_name = xstrdup(service_name);
1162
1163         p->in = 0;
1164         p->out = 1;
1165         strbuf_init(&p->request_buffer, 0);
1166
1167         strbuf_addf(&buf, "%s%s", url.buf, p->service_name);
1168         p->service_url = strbuf_detach(&buf, NULL);
1169
1170         p->headers = http_copy_default_headers();
1171
1172         strbuf_addf(&buf, "Content-Type: application/x-%s-request", p->service_name);
1173         p->headers = curl_slist_append(p->headers, buf.buf);
1174         strbuf_reset(&buf);
1175
1176         strbuf_addf(&buf, "Accept: application/x-%s-result", p->service_name);
1177         p->headers = curl_slist_append(p->headers, buf.buf);
1178         strbuf_reset(&buf);
1179
1180         p->headers = curl_slist_append(p->headers, "Transfer-Encoding: chunked");
1181
1182         /* Add the Git-Protocol header */
1183         if (get_protocol_http_header(version, &buf))
1184                 p->headers = curl_slist_append(p->headers, buf.buf);
1185
1186         packet_reader_init(&p->reader, p->in, NULL, 0,
1187                            PACKET_READ_GENTLE_ON_EOF |
1188                            PACKET_READ_DIE_ON_ERR_PACKET);
1189
1190         strbuf_release(&buf);
1191 }
1192
1193 static void proxy_state_clear(struct proxy_state *p)
1194 {
1195         free(p->service_name);
1196         free(p->service_url);
1197         curl_slist_free_all(p->headers);
1198         strbuf_release(&p->request_buffer);
1199 }
1200
1201 /*
1202  * CURLOPT_READFUNCTION callback function.
1203  * Attempts to copy over a single packet-line at a time into the
1204  * curl provided buffer.
1205  */
1206 static size_t proxy_in(char *buffer, size_t eltsize,
1207                        size_t nmemb, void *userdata)
1208 {
1209         size_t max;
1210         struct proxy_state *p = userdata;
1211         size_t avail = p->request_buffer.len - p->pos;
1212
1213
1214         if (eltsize != 1)
1215                 BUG("curl read callback called with size = %"PRIuMAX" != 1",
1216                     (uintmax_t)eltsize);
1217         max = nmemb;
1218
1219         if (!avail) {
1220                 if (p->seen_flush) {
1221                         p->seen_flush = 0;
1222                         return 0;
1223                 }
1224
1225                 strbuf_reset(&p->request_buffer);
1226                 switch (packet_reader_read(&p->reader)) {
1227                 case PACKET_READ_EOF:
1228                         die("unexpected EOF when reading from parent process");
1229                 case PACKET_READ_NORMAL:
1230                         packet_buf_write_len(&p->request_buffer, p->reader.line,
1231                                              p->reader.pktlen);
1232                         break;
1233                 case PACKET_READ_DELIM:
1234                         packet_buf_delim(&p->request_buffer);
1235                         break;
1236                 case PACKET_READ_FLUSH:
1237                         packet_buf_flush(&p->request_buffer);
1238                         p->seen_flush = 1;
1239                         break;
1240                 }
1241                 p->pos = 0;
1242                 avail = p->request_buffer.len;
1243         }
1244
1245         if (max < avail)
1246                 avail = max;
1247         memcpy(buffer, p->request_buffer.buf + p->pos, avail);
1248         p->pos += avail;
1249         return avail;
1250 }
1251
1252 static size_t proxy_out(char *buffer, size_t eltsize,
1253                         size_t nmemb, void *userdata)
1254 {
1255         size_t size;
1256         struct proxy_state *p = userdata;
1257
1258         if (eltsize != 1)
1259                 BUG("curl read callback called with size = %"PRIuMAX" != 1",
1260                     (uintmax_t)eltsize);
1261         size = nmemb;
1262
1263         write_or_die(p->out, buffer, size);
1264         return size;
1265 }
1266
1267 /* Issues a request to the HTTP server configured in `p` */
1268 static int proxy_request(struct proxy_state *p)
1269 {
1270         struct active_request_slot *slot;
1271
1272         slot = get_active_slot();
1273
1274         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1275         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1276         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
1277         curl_easy_setopt(slot->curl, CURLOPT_URL, p->service_url);
1278         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, p->headers);
1279
1280         /* Setup function to read request from client */
1281         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, proxy_in);
1282         curl_easy_setopt(slot->curl, CURLOPT_READDATA, p);
1283
1284         /* Setup function to write server response to client */
1285         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, proxy_out);
1286         curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, p);
1287
1288         if (run_slot(slot, NULL) != HTTP_OK)
1289                 return -1;
1290
1291         return 0;
1292 }
1293
1294 static int stateless_connect(const char *service_name)
1295 {
1296         struct discovery *discover;
1297         struct proxy_state p;
1298
1299         /*
1300          * Run the info/refs request and see if the server supports protocol
1301          * v2.  If and only if the server supports v2 can we successfully
1302          * establish a stateless connection, otherwise we need to tell the
1303          * client to fallback to using other transport helper functions to
1304          * complete their request.
1305          */
1306         discover = discover_refs(service_name, 0);
1307         if (discover->version != protocol_v2) {
1308                 printf("fallback\n");
1309                 fflush(stdout);
1310                 return -1;
1311         } else {
1312                 /* Stateless Connection established */
1313                 printf("\n");
1314                 fflush(stdout);
1315         }
1316
1317         proxy_state_init(&p, service_name, discover->version);
1318
1319         /*
1320          * Dump the capability listing that we got from the server earlier
1321          * during the info/refs request.
1322          */
1323         write_or_die(p.out, discover->buf, discover->len);
1324
1325         /* Peek the next packet line.  Until we see EOF keep sending POSTs */
1326         while (packet_reader_peek(&p.reader) != PACKET_READ_EOF) {
1327                 if (proxy_request(&p)) {
1328                         /* We would have an err here */
1329                         break;
1330                 }
1331         }
1332
1333         proxy_state_clear(&p);
1334         return 0;
1335 }
1336
1337 int cmd_main(int argc, const char **argv)
1338 {
1339         struct strbuf buf = STRBUF_INIT;
1340         int nongit;
1341
1342         setup_git_directory_gently(&nongit);
1343         if (argc < 2) {
1344                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
1345                 return 1;
1346         }
1347
1348         options.verbosity = 1;
1349         options.progress = !!isatty(2);
1350         options.thin = 1;
1351         string_list_init(&options.deepen_not, 1);
1352         string_list_init(&options.push_options, 1);
1353
1354         remote = remote_get(argv[1]);
1355
1356         if (argc > 2) {
1357                 end_url_with_slash(&url, argv[2]);
1358         } else {
1359                 end_url_with_slash(&url, remote->url[0]);
1360         }
1361
1362         http_init(remote, url.buf, 0);
1363
1364         do {
1365                 const char *arg;
1366
1367                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1368                         if (ferror(stdin))
1369                                 error("remote-curl: error reading command stream from git");
1370                         return 1;
1371                 }
1372                 if (buf.len == 0)
1373                         break;
1374                 if (starts_with(buf.buf, "fetch ")) {
1375                         if (nongit)
1376                                 die("remote-curl: fetch attempted without a local repo");
1377                         parse_fetch(&buf);
1378
1379                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1380                         int for_push = !!strstr(buf.buf + 4, "for-push");
1381                         output_refs(get_refs(for_push));
1382
1383                 } else if (starts_with(buf.buf, "push ")) {
1384                         parse_push(&buf);
1385
1386                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1387                         char *value = strchr(arg, ' ');
1388                         int result;
1389
1390                         if (value)
1391                                 *value++ = '\0';
1392                         else
1393                                 value = "true";
1394
1395                         result = set_option(arg, value);
1396                         if (!result)
1397                                 printf("ok\n");
1398                         else if (result < 0)
1399                                 printf("error invalid value\n");
1400                         else
1401                                 printf("unsupported\n");
1402                         fflush(stdout);
1403
1404                 } else if (!strcmp(buf.buf, "capabilities")) {
1405                         printf("stateless-connect\n");
1406                         printf("fetch\n");
1407                         printf("option\n");
1408                         printf("push\n");
1409                         printf("check-connectivity\n");
1410                         printf("\n");
1411                         fflush(stdout);
1412                 } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1413                         if (!stateless_connect(arg))
1414                                 break;
1415                 } else {
1416                         error("remote-curl: unknown command '%s' from git", buf.buf);
1417                         return 1;
1418                 }
1419                 strbuf_reset(&buf);
1420         } while (1);
1421
1422         http_cleanup();
1423
1424         return 0;
1425 }