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
 209         heads->version = discover_version(&reader);
 210         switch (heads->version) {
 211         case protocol_v2:
 212                 /*
 213                  * Do nothing.  This isn't a list of refs but rather a
 214                  * capability advertisement.  Client would have run
 215                  * 'stateless-connect' so we'll dump this capability listing
 216                  * and let them request the refs themselves.
 217                  */
 218                 break;
 219         case protocol_v1:
 220         case protocol_v0:
 221                 get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
 222                                  NULL, &heads->shallow);
 223                 break;
 224         case protocol_unknown_version:
 225                 BUG("unknown protocol version");
 226         }
 227
 228         return list;
 229 }
 230
 231 static struct ref *parse_info_refs(struct discovery *heads)
 232 {
 233         char *data, *start, *mid;
 234         char *ref_name;
 235         int i = 0;
 236
 237         struct ref *refs = NULL;
 238         struct ref *ref = NULL;
 239         struct ref *last_ref = NULL;
 240
 241         data = heads->buf;
 242         start = NULL;
 243         mid = data;
 244         while (i < heads->len) {
 245                 if (!start) {
 246                         start = &data[i];
 247                 }
 248                 if (data[i] == '\t')
 249                         mid = &data[i];
 250                 if (data[i] == '\n') {
 251                         if (mid - start != 40)
 252                                 die("%sinfo/refs not valid: is this a git repository?",
 253                                     url.buf);
 254                         data[i] = 0;
 255                         ref_name = mid + 1;
 256                         ref = alloc_ref(ref_name);
 257                         get_oid_hex(start, &ref->old_oid);
 258                         if (!refs)
 259                                 refs = ref;
 260                         if (last_ref)
 261                                 last_ref->next = ref;
 262                         last_ref = ref;
 263                         start = NULL;
 264                 }
 265                 i++;
 266         }
 267
 268         ref = alloc_ref("HEAD");
 269         if (!http_fetch_ref(url.buf, ref) &&
 270             !resolve_remote_symref(ref, refs)) {
 271                 ref->next = refs;
 272                 refs = ref;
 273         } else {
 274                 free(ref);
 275         }
 276
 277         return refs;
 278 }
 279
 280 static void free_discovery(struct discovery *d)
 281 {
 282         if (d) {
 283                 if (d == last_discovery)
 284                         last_discovery = NULL;
 285                 free(d->shallow.oid);
 286                 free(d->buf_alloc);
 287                 free_refs(d->refs);
 288                 free(d->service);
 289                 free(d);
 290         }
 291 }
 292
 293 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 294                              struct strbuf *msg)
 295 {
 296         const char *p, *eol;
 297
 298         /*
 299          * We only show text/plain parts, as other types are likely
 300          * to be ugly to look at on the user's terminal.
 301          */
 302         if (strcmp(type->buf, "text/plain"))
 303                 return -1;
 304         if (charset->len)
 305                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 306
 307         strbuf_trim(msg);
 308         if (!msg->len)
 309                 return -1;
 310
 311         p = msg->buf;
 312         do {
 313                 eol = strchrnul(p, '\n');
 314                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 315                 p = eol + 1;
 316         } while(*eol);
 317         return 0;
 318 }
 319
 320 static int get_protocol_http_header(enum protocol_version version,
 321                                     struct strbuf *header)
 322 {
 323         if (version > 0) {
 324                 strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
 325                             version);
 326
 327                 return 1;
 328         }
 329
 330         return 0;
 331 }
 332
 333 static struct discovery *discover_refs(const char *service, int for_push)
 334 {
 335         struct strbuf exp = STRBUF_INIT;
 336         struct strbuf type = STRBUF_INIT;
 337         struct strbuf charset = STRBUF_INIT;
 338         struct strbuf buffer = STRBUF_INIT;
 339         struct strbuf refs_url = STRBUF_INIT;
 340         struct strbuf effective_url = STRBUF_INIT;
 341         struct strbuf protocol_header = STRBUF_INIT;
 342         struct string_list extra_headers = STRING_LIST_INIT_DUP;
 343         struct discovery *last = last_discovery;
 344         int http_ret, maybe_smart = 0;
 345         struct http_get_options http_options;
 346         enum protocol_version version = get_protocol_version_config();
 347
 348         if (last && !strcmp(service, last->service))
 349                 return last;
 350         free_discovery(last);
 351
 352         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 353         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 354              git_env_bool("GIT_SMART_HTTP", 1)) {
 355                 maybe_smart = 1;
 356                 if (!strchr(url.buf, '?'))
 357                         strbuf_addch(&refs_url, '?');
 358                 else
 359                         strbuf_addch(&refs_url, '&');
 360                 strbuf_addf(&refs_url, "service=%s", service);
 361         }
 362
 363         /*
 364          * NEEDSWORK: If we are trying to use protocol v2 and we are planning
 365          * to perform a push, then fallback to v0 since the client doesn't know
 366          * how to push yet using v2.
 367          */
 368         if (version == protocol_v2 && !strcmp("git-receive-pack", service))
 369                 version = protocol_v0;
 370
 371         /* Add the extra Git-Protocol header */
 372         if (get_protocol_http_header(version, &protocol_header))
 373                 string_list_append(&extra_headers, protocol_header.buf);
 374
 375         memset(&http_options, 0, sizeof(http_options));
 376         http_options.content_type = &type;
 377         http_options.charset = &charset;
 378         http_options.effective_url = &effective_url;
 379         http_options.base_url = &url;
 380         http_options.extra_headers = &extra_headers;
 381         http_options.initial_request = 1;
 382         http_options.no_cache = 1;
 383
 384         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 385         switch (http_ret) {
 386         case HTTP_OK:
 387                 break;
 388         case HTTP_MISSING_TARGET:
 389                 show_http_message(&type, &charset, &buffer);
 390                 die("repository '%s' not found", url.buf);
 391         case HTTP_NOAUTH:
 392                 show_http_message(&type, &charset, &buffer);
 393                 die("Authentication failed for '%s'", url.buf);
 394         default:
 395                 show_http_message(&type, &charset, &buffer);
 396                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 397         }
 398
 399         if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 400                 warning(_("redirecting to %s"), url.buf);
 401
 402         last= xcalloc(1, sizeof(*last_discovery));
 403         last->service = xstrdup(service);
 404         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 405         last->buf = last->buf_alloc;
 406
 407         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 408         if (maybe_smart &&
 409             (5 <= last->len && last->buf[4] == '#') &&
 410             !strbuf_cmp(&exp, &type)) {
 411                 char *line;
 412
 413                 /*
 414                  * smart HTTP response; validate that the service
 415                  * pkt-line matches our request.
 416                  */
 417                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 418                 if (!line)
 419                         die("invalid server response; expected service, got flush packet");
 420
 421                 strbuf_reset(&exp);
 422                 strbuf_addf(&exp, "# service=%s", service);
 423                 if (strcmp(line, exp.buf))
 424                         die("invalid server response; got '%s'", line);
 425                 strbuf_release(&exp);
 426
 427                 /* The header can include additional metadata lines, up
 428                  * until a packet flush marker.  Ignore these now, but
 429                  * in the future we might start to scan them.
 430                  */
 431                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 432                         ;
 433
 434                 last->proto_git = 1;
 435         } else if (maybe_smart &&
 436                    last->len > 5 && starts_with(last->buf + 4, "version 2")) {
 437                 last->proto_git = 1;
 438         }
 439
 440         if (last->proto_git)
 441                 last->refs = parse_git_refs(last, for_push);
 442         else
 443                 last->refs = parse_info_refs(last);
 444
 445         strbuf_release(&refs_url);
 446         strbuf_release(&exp);
 447         strbuf_release(&type);
 448         strbuf_release(&charset);
 449         strbuf_release(&effective_url);
 450         strbuf_release(&buffer);
 451         strbuf_release(&protocol_header);
 452         string_list_clear(&extra_headers, 0);
 453         last_discovery = last;
 454         return last;
 455 }
 456
 457 static struct ref *get_refs(int for_push)
 458 {
 459         struct discovery *heads;
 460
 461         if (for_push)
 462                 heads = discover_refs("git-receive-pack", for_push);
 463         else
 464                 heads = discover_refs("git-upload-pack", for_push);
 465
 466         return heads->refs;
 467 }
 468
 469 static void output_refs(struct ref *refs)
 470 {
 471         struct ref *posn;
 472         for (posn = refs; posn; posn = posn->next) {
 473                 if (posn->symref)
 474                         printf("@%s %s\n", posn->symref, posn->name);
 475                 else
 476                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 477         }
 478         printf("\n");
 479         fflush(stdout);
 480 }
 481
 482 struct rpc_state {
 483         const char *service_name;
 484         const char **argv;
 485         struct strbuf *stdin_preamble;
 486         char *service_url;
 487         char *hdr_content_type;
 488         char *hdr_accept;
 489         char *protocol_header;
 490         char *buf;
 491         size_t alloc;
 492         size_t len;
 493         size_t pos;
 494         int in;
 495         int out;
 496         int any_written;
 497         struct strbuf result;
 498         unsigned gzip_request : 1;
 499         unsigned initial_buffer : 1;
 500 };
 501
 502 static size_t rpc_out(void *ptr, size_t eltsize,
 503                 size_t nmemb, void *buffer_)
 504 {
 505         size_t max = eltsize * nmemb;
 506         struct rpc_state *rpc = buffer_;
 507         size_t avail = rpc->len - rpc->pos;
 508
 509         if (!avail) {
 510                 rpc->initial_buffer = 0;
 511                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 512                 if (!avail)
 513                         return 0;
 514                 rpc->pos = 0;
 515                 rpc->len = avail;
 516         }
 517
 518         if (max < avail)
 519                 avail = max;
 520         memcpy(ptr, rpc->buf + rpc->pos, avail);
 521         rpc->pos += avail;
 522         return avail;
 523 }
 524
 525 #ifndef NO_CURL_IOCTL
 526 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 527 {
 528         struct rpc_state *rpc = clientp;
 529
 530         switch (cmd) {
 531         case CURLIOCMD_NOP:
 532                 return CURLIOE_OK;
 533
 534         case CURLIOCMD_RESTARTREAD:
 535                 if (rpc->initial_buffer) {
 536                         rpc->pos = 0;
 537                         return CURLIOE_OK;
 538                 }
 539                 error("unable to rewind rpc post data - try increasing http.postBuffer");
 540                 return CURLIOE_FAILRESTART;
 541
 542         default:
 543                 return CURLIOE_UNKNOWNCMD;
 544         }
 545 }
 546 #endif
 547
 548 struct rpc_in_data {
 549         struct rpc_state *rpc;
 550         struct active_request_slot *slot;
 551 };
 552
 553 /*
 554  * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
 555  * from ptr.
 556  */
 557 static size_t rpc_in(char *ptr, size_t eltsize,
 558                 size_t nmemb, void *buffer_)
 559 {
 560         size_t size = eltsize * nmemb;
 561         struct rpc_in_data *data = buffer_;
 562         long response_code;
 563
 564         if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
 565                               &response_code) != CURLE_OK)
 566                 return size;
 567         if (response_code >= 300)
 568                 return size;
 569         if (size)
 570                 data->rpc->any_written = 1;
 571         write_or_die(data->rpc->in, ptr, size);
 572         return size;
 573 }
 574
 575 static int run_slot(struct active_request_slot *slot,
 576                     struct slot_results *results)
 577 {
 578         int err;
 579         struct slot_results results_buf;
 580
 581         if (!results)
 582                 results = &results_buf;
 583
 584         err = run_one_slot(slot, results);
 585
 586         if (err != HTTP_OK && err != HTTP_REAUTH) {
 587                 struct strbuf msg = STRBUF_INIT;
 588                 if (results->http_code && results->http_code != 200)
 589                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 590                 if (results->curl_result != CURLE_OK) {
 591                         if (msg.len)
 592                                 strbuf_addch(&msg, ' ');
 593                         strbuf_addf(&msg, "curl %d", results->curl_result);
 594                         if (curl_errorstr[0]) {
 595                                 strbuf_addch(&msg, ' ');
 596                                 strbuf_addstr(&msg, curl_errorstr);
 597                         }
 598                 }
 599                 error("RPC failed; %s", msg.buf);
 600                 strbuf_release(&msg);
 601         }
 602
 603         return err;
 604 }
 605
 606 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 607 {
 608         struct active_request_slot *slot;
 609         struct curl_slist *headers = http_copy_default_headers();
 610         struct strbuf buf = STRBUF_INIT;
 611         int err;
 612
 613         slot = get_active_slot();
 614
 615         headers = curl_slist_append(headers, rpc->hdr_content_type);
 616         headers = curl_slist_append(headers, rpc->hdr_accept);
 617
 618         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 619         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 620         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 621         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 622         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 623         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 624         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 625         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 626         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 627
 628         err = run_slot(slot, results);
 629
 630         curl_slist_free_all(headers);
 631         strbuf_release(&buf);
 632         return err;
 633 }
 634
 635 static curl_off_t xcurl_off_t(size_t len)
 636 {
 637         uintmax_t size = len;
 638         if (size > maximum_signed_value_of_type(curl_off_t))
 639                 die("cannot handle pushes this big");
 640         return (curl_off_t)size;
 641 }
 642
 643 static int post_rpc(struct rpc_state *rpc)
 644 {
 645         struct active_request_slot *slot;
 646         struct curl_slist *headers = http_copy_default_headers();
 647         int use_gzip = rpc->gzip_request;
 648         char *gzip_body = NULL;
 649         size_t gzip_size = 0;
 650         int err, large_request = 0;
 651         int needs_100_continue = 0;
 652         struct rpc_in_data rpc_in_data;
 653
 654         /* Try to load the entire request, if we can fit it into the
 655          * allocated buffer space we can use HTTP/1.0 and avoid the
 656          * chunked encoding mess.
 657          */
 658         while (1) {
 659                 size_t left = rpc->alloc - rpc->len;
 660                 char *buf = rpc->buf + rpc->len;
 661                 int n;
 662
 663                 if (left < LARGE_PACKET_MAX) {
 664                         large_request = 1;
 665                         use_gzip = 0;
 666                         break;
 667                 }
 668
 669                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 670                 if (!n)
 671                         break;
 672                 rpc->len += n;
 673         }
 674
 675         if (large_request) {
 676                 struct slot_results results;
 677
 678                 do {
 679                         err = probe_rpc(rpc, &results);
 680                         if (err == HTTP_REAUTH)
 681                                 credential_fill(&http_auth);
 682                 } while (err == HTTP_REAUTH);
 683                 if (err != HTTP_OK)
 684                         return -1;
 685
 686                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 687                         needs_100_continue = 1;
 688         }
 689
 690         headers = curl_slist_append(headers, rpc->hdr_content_type);
 691         headers = curl_slist_append(headers, rpc->hdr_accept);
 692         headers = curl_slist_append(headers, needs_100_continue ?
 693                 "Expect: 100-continue" : "Expect:");
 694
 695         /* Add the extra Git-Protocol header */
 696         if (rpc->protocol_header)
 697                 headers = curl_slist_append(headers, rpc->protocol_header);
 698
 699 retry:
 700         slot = get_active_slot();
 701
 702         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 703         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 704         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 705         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 706
 707         if (large_request) {
 708                 /* The request body is large and the size cannot be predicted.
 709                  * We must use chunked encoding to send it.
 710                  */
 711                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 712                 rpc->initial_buffer = 1;
 713                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 714                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 715 #ifndef NO_CURL_IOCTL
 716                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 717                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 718 #endif
 719                 if (options.verbosity > 1) {
 720                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 721                         fflush(stderr);
 722                 }
 723
 724         } else if (gzip_body) {
 725                 /*
 726                  * If we are looping to retry authentication, then the previous
 727                  * run will have set up the headers and gzip buffer already,
 728                  * and we just need to send it.
 729                  */
 730                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 731                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 732
 733         } else if (use_gzip && 1024 < rpc->len) {
 734                 /* The client backend isn't giving us compressed data so
 735                  * we can try to deflate it ourselves, this may save on
 736                  * the transfer time.
 737                  */
 738                 git_zstream stream;
 739                 int ret;
 740
 741                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 742                 gzip_size = git_deflate_bound(&stream, rpc->len);
 743                 gzip_body = xmalloc(gzip_size);
 744
 745                 stream.next_in = (unsigned char *)rpc->buf;
 746                 stream.avail_in = rpc->len;
 747                 stream.next_out = (unsigned char *)gzip_body;
 748                 stream.avail_out = gzip_size;
 749
 750                 ret = git_deflate(&stream, Z_FINISH);
 751                 if (ret != Z_STREAM_END)
 752                         die("cannot deflate request; zlib deflate error %d", ret);
 753
 754                 ret = git_deflate_end_gently(&stream);
 755                 if (ret != Z_OK)
 756                         die("cannot deflate request; zlib end error %d", ret);
 757
 758                 gzip_size = stream.total_out;
 759
 760                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 761                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 762                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 763
 764                 if (options.verbosity > 1) {
 765                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 766                                 rpc->service_name,
 767                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 768                         fflush(stderr);
 769                 }
 770         } else {
 771                 /* We know the complete request size in advance, use the
 772                  * more normal Content-Length approach.
 773                  */
 774                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 775                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 776                 if (options.verbosity > 1) {
 777                         fprintf(stderr, "POST %s (%lu bytes)\n",
 778                                 rpc->service_name, (unsigned long)rpc->len);
 779                         fflush(stderr);
 780                 }
 781         }
 782
 783         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 784         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 785         rpc_in_data.rpc = rpc;
 786         rpc_in_data.slot = slot;
 787         curl_easy_setopt(slot->curl, CURLOPT_FILE, &rpc_in_data);
 788         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
 789
 790
 791         rpc->any_written = 0;
 792         err = run_slot(slot, NULL);
 793         if (err == HTTP_REAUTH && !large_request) {
 794                 credential_fill(&http_auth);
 795                 goto retry;
 796         }
 797         if (err != HTTP_OK)
 798                 err = -1;
 799
 800         if (!rpc->any_written)
 801                 err = -1;
 802
 803         curl_slist_free_all(headers);
 804         free(gzip_body);
 805         return err;
 806 }
 807
 808 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 809 {
 810         const char *svc = rpc->service_name;
 811         struct strbuf buf = STRBUF_INIT;
 812         struct strbuf *preamble = rpc->stdin_preamble;
 813         struct child_process client = CHILD_PROCESS_INIT;
 814         int err = 0;
 815
 816         client.in = -1;
 817         client.out = -1;
 818         client.git_cmd = 1;
 819         client.argv = rpc->argv;
 820         if (start_command(&client))
 821                 exit(1);
 822         if (preamble)
 823                 write_or_die(client.in, preamble->buf, preamble->len);
 824         if (heads)
 825                 write_or_die(client.in, heads->buf, heads->len);
 826
 827         rpc->alloc = http_post_buffer;
 828         rpc->buf = xmalloc(rpc->alloc);
 829         rpc->in = client.in;
 830         rpc->out = client.out;
 831         strbuf_init(&rpc->result, 0);
 832
 833         strbuf_addf(&buf, "%s%s", url.buf, svc);
 834         rpc->service_url = strbuf_detach(&buf, NULL);
 835
 836         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 837         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 838
 839         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 840         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 841
 842         if (get_protocol_http_header(heads->version, &buf))
 843                 rpc->protocol_header = strbuf_detach(&buf, NULL);
 844         else
 845                 rpc->protocol_header = NULL;
 846
 847         while (!err) {
 848                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 849                 if (!n)
 850                         break;
 851                 rpc->pos = 0;
 852                 rpc->len = n;
 853                 err |= post_rpc(rpc);
 854         }
 855
 856         close(client.in);
 857         client.in = -1;
 858         if (!err) {
 859                 strbuf_read(&rpc->result, client.out, 0);
 860         } else {
 861                 char buf[4096];
 862                 for (;;)
 863                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 864                                 break;
 865         }
 866
 867         close(client.out);
 868         client.out = -1;
 869
 870         err |= finish_command(&client);
 871         free(rpc->service_url);
 872         free(rpc->hdr_content_type);
 873         free(rpc->hdr_accept);
 874         free(rpc->protocol_header);
 875         free(rpc->buf);
 876         strbuf_release(&buf);
 877         return err;
 878 }
 879
 880 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 881 {
 882         struct walker *walker;
 883         char **targets;
 884         int ret, i;
 885
 886         ALLOC_ARRAY(targets, nr_heads);
 887         if (options.depth || options.deepen_since)
 888                 die("dumb http transport does not support shallow capabilities");
 889         for (i = 0; i < nr_heads; i++)
 890                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 891
 892         walker = get_http_walker(url.buf);
 893         walker->get_verbosely = options.verbosity >= 3;
 894         walker->get_recover = 0;
 895         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 896         walker_free(walker);
 897
 898         for (i = 0; i < nr_heads; i++)
 899                 free(targets[i]);
 900         free(targets);
 901
 902         return ret ? error("fetch failed.") : 0;
 903 }
 904
 905 static int fetch_git(struct discovery *heads,
 906         int nr_heads, struct ref **to_fetch)
 907 {
 908         struct rpc_state rpc;
 909         struct strbuf preamble = STRBUF_INIT;
 910         int i, err;
 911         struct argv_array args = ARGV_ARRAY_INIT;
 912
 913         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 914                          "--stdin", "--lock-pack", NULL);
 915         if (options.followtags)
 916                 argv_array_push(&args, "--include-tag");
 917         if (options.thin)
 918                 argv_array_push(&args, "--thin");
 919         if (options.verbosity >= 3)
 920                 argv_array_pushl(&args, "-v", "-v", NULL);
 921         if (options.check_self_contained_and_connected)
 922                 argv_array_push(&args, "--check-self-contained-and-connected");
 923         if (options.cloning)
 924                 argv_array_push(&args, "--cloning");
 925         if (options.update_shallow)
 926                 argv_array_push(&args, "--update-shallow");
 927         if (!options.progress)
 928                 argv_array_push(&args, "--no-progress");
 929         if (options.depth)
 930                 argv_array_pushf(&args, "--depth=%lu", options.depth);
 931         if (options.deepen_since)
 932                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 933         for (i = 0; i < options.deepen_not.nr; i++)
 934                 argv_array_pushf(&args, "--shallow-exclude=%s",
 935                                  options.deepen_not.items[i].string);
 936         if (options.deepen_relative && options.depth)
 937                 argv_array_push(&args, "--deepen-relative");
 938         if (options.from_promisor)
 939                 argv_array_push(&args, "--from-promisor");
 940         if (options.no_dependents)
 941                 argv_array_push(&args, "--no-dependents");
 942         if (options.filter)
 943                 argv_array_pushf(&args, "--filter=%s", options.filter);
 944         argv_array_push(&args, url.buf);
 945
 946         for (i = 0; i < nr_heads; i++) {
 947                 struct ref *ref = to_fetch[i];
 948                 if (!*ref->name)
 949                         die("cannot fetch by sha1 over smart http");
 950                 packet_buf_write(&preamble, "%s %s\n",
 951                                  oid_to_hex(&ref->old_oid), ref->name);
 952         }
 953         packet_buf_flush(&preamble);
 954
 955         memset(&rpc, 0, sizeof(rpc));
 956         rpc.service_name = "git-upload-pack",
 957         rpc.argv = args.argv;
 958         rpc.stdin_preamble = &preamble;
 959         rpc.gzip_request = 1;
 960
 961         err = rpc_service(&rpc, heads);
 962         if (rpc.result.len)
 963                 write_or_die(1, rpc.result.buf, rpc.result.len);
 964         strbuf_release(&rpc.result);
 965         strbuf_release(&preamble);
 966         argv_array_clear(&args);
 967         return err;
 968 }
 969
 970 static int fetch(int nr_heads, struct ref **to_fetch)
 971 {
 972         struct discovery *d = discover_refs("git-upload-pack", 0);
 973         if (d->proto_git)
 974                 return fetch_git(d, nr_heads, to_fetch);
 975         else
 976                 return fetch_dumb(nr_heads, to_fetch);
 977 }
 978
 979 static void parse_fetch(struct strbuf *buf)
 980 {
 981         struct ref **to_fetch = NULL;
 982         struct ref *list_head = NULL;
 983         struct ref **list = &list_head;
 984         int alloc_heads = 0, nr_heads = 0;
 985
 986         do {
 987                 const char *p;
 988                 if (skip_prefix(buf->buf, "fetch ", &p)) {
 989                         const char *name;
 990                         struct ref *ref;
 991                         struct object_id old_oid;
 992
 993                         if (get_oid_hex(p, &old_oid))
 994                                 die("protocol error: expected sha/ref, got %s'", p);
 995                         if (p[GIT_SHA1_HEXSZ] == ' ')
 996                                 name = p + GIT_SHA1_HEXSZ + 1;
 997                         else if (!p[GIT_SHA1_HEXSZ])
 998                                 name = "";
 999                         else
1000                                 die("protocol error: expected sha/ref, got %s'", p);
1001
1002                         ref = alloc_ref(name);
1003                         oidcpy(&ref->old_oid, &old_oid);
1004
1005                         *list = ref;
1006                         list = &ref->next;
1007
1008                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1009                         to_fetch[nr_heads++] = ref;
1010                 }
1011                 else
1012                         die("http transport does not support %s", buf->buf);
1013
1014                 strbuf_reset(buf);
1015                 if (strbuf_getline_lf(buf, stdin) == EOF)
1016                         return;
1017                 if (!*buf->buf)
1018                         break;
1019         } while (1);
1020
1021         if (fetch(nr_heads, to_fetch))
1022                 exit(128); /* error already reported */
1023         free_refs(list_head);
1024         free(to_fetch);
1025
1026         printf("\n");
1027         fflush(stdout);
1028         strbuf_reset(buf);
1029 }
1030
1031 static int push_dav(int nr_spec, char **specs)
1032 {
1033         struct child_process child = CHILD_PROCESS_INIT;
1034         size_t i;
1035
1036         child.git_cmd = 1;
1037         argv_array_push(&child.args, "http-push");
1038         argv_array_push(&child.args, "--helper-status");
1039         if (options.dry_run)
1040                 argv_array_push(&child.args, "--dry-run");
1041         if (options.verbosity > 1)
1042                 argv_array_push(&child.args, "--verbose");
1043         argv_array_push(&child.args, url.buf);
1044         for (i = 0; i < nr_spec; i++)
1045                 argv_array_push(&child.args, specs[i]);
1046
1047         if (run_command(&child))
1048                 die("git-http-push failed");
1049         return 0;
1050 }
1051
1052 static int push_git(struct discovery *heads, int nr_spec, char **specs)
1053 {
1054         struct rpc_state rpc;
1055         int i, err;
1056         struct argv_array args;
1057         struct string_list_item *cas_option;
1058         struct strbuf preamble = STRBUF_INIT;
1059
1060         argv_array_init(&args);
1061         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1062                          NULL);
1063
1064         if (options.thin)
1065                 argv_array_push(&args, "--thin");
1066         if (options.dry_run)
1067                 argv_array_push(&args, "--dry-run");
1068         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1069                 argv_array_push(&args, "--signed=yes");
1070         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1071                 argv_array_push(&args, "--signed=if-asked");
1072         if (options.verbosity == 0)
1073                 argv_array_push(&args, "--quiet");
1074         else if (options.verbosity > 1)
1075                 argv_array_push(&args, "--verbose");
1076         for (i = 0; i < options.push_options.nr; i++)
1077                 argv_array_pushf(&args, "--push-option=%s",
1078                                  options.push_options.items[i].string);
1079         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1080         for_each_string_list_item(cas_option, &cas_options)
1081                 argv_array_push(&args, cas_option->string);
1082         argv_array_push(&args, url.buf);
1083
1084         argv_array_push(&args, "--stdin");
1085         for (i = 0; i < nr_spec; i++)
1086                 packet_buf_write(&preamble, "%s\n", specs[i]);
1087         packet_buf_flush(&preamble);
1088
1089         memset(&rpc, 0, sizeof(rpc));
1090         rpc.service_name = "git-receive-pack",
1091         rpc.argv = args.argv;
1092         rpc.stdin_preamble = &preamble;
1093
1094         err = rpc_service(&rpc, heads);
1095         if (rpc.result.len)
1096                 write_or_die(1, rpc.result.buf, rpc.result.len);
1097         strbuf_release(&rpc.result);
1098         strbuf_release(&preamble);
1099         argv_array_clear(&args);
1100         return err;
1101 }
1102
1103 static int push(int nr_spec, char **specs)
1104 {
1105         struct discovery *heads = discover_refs("git-receive-pack", 1);
1106         int ret;
1107
1108         if (heads->proto_git)
1109                 ret = push_git(heads, nr_spec, specs);
1110         else
1111                 ret = push_dav(nr_spec, specs);
1112         free_discovery(heads);
1113         return ret;
1114 }
1115
1116 static void parse_push(struct strbuf *buf)
1117 {
1118         char **specs = NULL;
1119         int alloc_spec = 0, nr_spec = 0, i, ret;
1120
1121         do {
1122                 if (starts_with(buf->buf, "push ")) {
1123                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1124                         specs[nr_spec++] = xstrdup(buf->buf + 5);
1125                 }
1126                 else
1127                         die("http transport does not support %s", buf->buf);
1128
1129                 strbuf_reset(buf);
1130                 if (strbuf_getline_lf(buf, stdin) == EOF)
1131                         goto free_specs;
1132                 if (!*buf->buf)
1133                         break;
1134         } while (1);
1135
1136         ret = push(nr_spec, specs);
1137         printf("\n");
1138         fflush(stdout);
1139
1140         if (ret)
1141                 exit(128); /* error already reported */
1142
1143  free_specs:
1144         for (i = 0; i < nr_spec; i++)
1145                 free(specs[i]);
1146         free(specs);
1147 }
1148
1149 /*
1150  * Used to represent the state of a connection to an HTTP server when
1151  * communicating using git's wire-protocol version 2.
1152  */
1153 struct proxy_state {
1154         char *service_name;
1155         char *service_url;
1156         struct curl_slist *headers;
1157         struct strbuf request_buffer;
1158         int in;
1159         int out;
1160         struct packet_reader reader;
1161         size_t pos;
1162         int seen_flush;
1163 };
1164
1165 static void proxy_state_init(struct proxy_state *p, const char *service_name,
1166                              enum protocol_version version)
1167 {
1168         struct strbuf buf = STRBUF_INIT;
1169
1170         memset(p, 0, sizeof(*p));
1171         p->service_name = xstrdup(service_name);
1172
1173         p->in = 0;
1174         p->out = 1;
1175         strbuf_init(&p->request_buffer, 0);
1176
1177         strbuf_addf(&buf, "%s%s", url.buf, p->service_name);
1178         p->service_url = strbuf_detach(&buf, NULL);
1179
1180         p->headers = http_copy_default_headers();
1181
1182         strbuf_addf(&buf, "Content-Type: application/x-%s-request", p->service_name);
1183         p->headers = curl_slist_append(p->headers, buf.buf);
1184         strbuf_reset(&buf);
1185
1186         strbuf_addf(&buf, "Accept: application/x-%s-result", p->service_name);
1187         p->headers = curl_slist_append(p->headers, buf.buf);
1188         strbuf_reset(&buf);
1189
1190         p->headers = curl_slist_append(p->headers, "Transfer-Encoding: chunked");
1191
1192         /* Add the Git-Protocol header */
1193         if (get_protocol_http_header(version, &buf))
1194                 p->headers = curl_slist_append(p->headers, buf.buf);
1195
1196         packet_reader_init(&p->reader, p->in, NULL, 0,
1197                            PACKET_READ_GENTLE_ON_EOF);
1198
1199         strbuf_release(&buf);
1200 }
1201
1202 static void proxy_state_clear(struct proxy_state *p)
1203 {
1204         free(p->service_name);
1205         free(p->service_url);
1206         curl_slist_free_all(p->headers);
1207         strbuf_release(&p->request_buffer);
1208 }
1209
1210 /*
1211  * CURLOPT_READFUNCTION callback function.
1212  * Attempts to copy over a single packet-line at a time into the
1213  * curl provided buffer.
1214  */
1215 static size_t proxy_in(char *buffer, size_t eltsize,
1216                        size_t nmemb, void *userdata)
1217 {
1218         size_t max;
1219         struct proxy_state *p = userdata;
1220         size_t avail = p->request_buffer.len - p->pos;
1221
1222
1223         if (eltsize != 1)
1224                 BUG("curl read callback called with size = %"PRIuMAX" != 1",
1225                     (uintmax_t)eltsize);
1226         max = nmemb;
1227
1228         if (!avail) {
1229                 if (p->seen_flush) {
1230                         p->seen_flush = 0;
1231                         return 0;
1232                 }
1233
1234                 strbuf_reset(&p->request_buffer);
1235                 switch (packet_reader_read(&p->reader)) {
1236                 case PACKET_READ_EOF:
1237                         die("unexpected EOF when reading from parent process");
1238                 case PACKET_READ_NORMAL:
1239                         packet_buf_write_len(&p->request_buffer, p->reader.line,
1240                                              p->reader.pktlen);
1241                         break;
1242                 case PACKET_READ_DELIM:
1243                         packet_buf_delim(&p->request_buffer);
1244                         break;
1245                 case PACKET_READ_FLUSH:
1246                         packet_buf_flush(&p->request_buffer);
1247                         p->seen_flush = 1;
1248                         break;
1249                 }
1250                 p->pos = 0;
1251                 avail = p->request_buffer.len;
1252         }
1253
1254         if (max < avail)
1255                 avail = max;
1256         memcpy(buffer, p->request_buffer.buf + p->pos, avail);
1257         p->pos += avail;
1258         return avail;
1259 }
1260
1261 static size_t proxy_out(char *buffer, size_t eltsize,
1262                         size_t nmemb, void *userdata)
1263 {
1264         size_t size;
1265         struct proxy_state *p = userdata;
1266
1267         if (eltsize != 1)
1268                 BUG("curl read callback called with size = %"PRIuMAX" != 1",
1269                     (uintmax_t)eltsize);
1270         size = nmemb;
1271
1272         write_or_die(p->out, buffer, size);
1273         return size;
1274 }
1275
1276 /* Issues a request to the HTTP server configured in `p` */
1277 static int proxy_request(struct proxy_state *p)
1278 {
1279         struct active_request_slot *slot;
1280
1281         slot = get_active_slot();
1282
1283         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1284         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1285         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
1286         curl_easy_setopt(slot->curl, CURLOPT_URL, p->service_url);
1287         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, p->headers);
1288
1289         /* Setup function to read request from client */
1290         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, proxy_in);
1291         curl_easy_setopt(slot->curl, CURLOPT_READDATA, p);
1292
1293         /* Setup function to write server response to client */
1294         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, proxy_out);
1295         curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, p);
1296
1297         if (run_slot(slot, NULL) != HTTP_OK)
1298                 return -1;
1299
1300         return 0;
1301 }
1302
1303 static int stateless_connect(const char *service_name)
1304 {
1305         struct discovery *discover;
1306         struct proxy_state p;
1307
1308         /*
1309          * Run the info/refs request and see if the server supports protocol
1310          * v2.  If and only if the server supports v2 can we successfully
1311          * establish a stateless connection, otherwise we need to tell the
1312          * client to fallback to using other transport helper functions to
1313          * complete their request.
1314          */
1315         discover = discover_refs(service_name, 0);
1316         if (discover->version != protocol_v2) {
1317                 printf("fallback\n");
1318                 fflush(stdout);
1319                 return -1;
1320         } else {
1321                 /* Stateless Connection established */
1322                 printf("\n");
1323                 fflush(stdout);
1324         }
1325
1326         proxy_state_init(&p, service_name, discover->version);
1327
1328         /*
1329          * Dump the capability listing that we got from the server earlier
1330          * during the info/refs request.
1331          */
1332         write_or_die(p.out, discover->buf, discover->len);
1333
1334         /* Peek the next packet line.  Until we see EOF keep sending POSTs */
1335         while (packet_reader_peek(&p.reader) != PACKET_READ_EOF) {
1336                 if (proxy_request(&p)) {
1337                         /* We would have an err here */
1338                         break;
1339                 }
1340         }
1341
1342         proxy_state_clear(&p);
1343         return 0;
1344 }
1345
1346 int cmd_main(int argc, const char **argv)
1347 {
1348         struct strbuf buf = STRBUF_INIT;
1349         int nongit;
1350
1351         setup_git_directory_gently(&nongit);
1352         if (argc < 2) {
1353                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
1354                 return 1;
1355         }
1356
1357         options.verbosity = 1;
1358         options.progress = !!isatty(2);
1359         options.thin = 1;
1360         string_list_init(&options.deepen_not, 1);
1361         string_list_init(&options.push_options, 1);
1362
1363         remote = remote_get(argv[1]);
1364
1365         if (argc > 2) {
1366                 end_url_with_slash(&url, argv[2]);
1367         } else {
1368                 end_url_with_slash(&url, remote->url[0]);
1369         }
1370
1371         http_init(remote, url.buf, 0);
1372
1373         do {
1374                 const char *arg;
1375
1376                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1377                         if (ferror(stdin))
1378                                 error("remote-curl: error reading command stream from git");
1379                         return 1;
1380                 }
1381                 if (buf.len == 0)
1382                         break;
1383                 if (starts_with(buf.buf, "fetch ")) {
1384                         if (nongit)
1385                                 die("remote-curl: fetch attempted without a local repo");
1386                         parse_fetch(&buf);
1387
1388                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1389                         int for_push = !!strstr(buf.buf + 4, "for-push");
1390                         output_refs(get_refs(for_push));
1391
1392                 } else if (starts_with(buf.buf, "push ")) {
1393                         parse_push(&buf);
1394
1395                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1396                         char *value = strchr(arg, ' ');
1397                         int result;
1398
1399                         if (value)
1400                                 *value++ = '\0';
1401                         else
1402                                 value = "true";
1403
1404                         result = set_option(arg, value);
1405                         if (!result)
1406                                 printf("ok\n");
1407                         else if (result < 0)
1408                                 printf("error invalid value\n");
1409                         else
1410                                 printf("unsupported\n");
1411                         fflush(stdout);
1412
1413                 } else if (!strcmp(buf.buf, "capabilities")) {
1414                         printf("stateless-connect\n");
1415                         printf("fetch\n");
1416                         printf("option\n");
1417                         printf("push\n");
1418                         printf("check-connectivity\n");
1419                         printf("\n");
1420                         fflush(stdout);
1421                 } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1422                         if (!stateless_connect(arg))
1423                                 break;
1424                 } else {
1425                         error("remote-curl: unknown command '%s' from git", buf.buf);
1426                         return 1;
1427                 }
1428                 strbuf_reset(&buf);
1429         } while (1);
1430
1431         http_cleanup();
1432
1433         return 0;
1434 }