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

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "remote.h"
   4 #include "connect.h"
   5 #include "strbuf.h"
   6 #include "walker.h"
   7 #include "http.h"
   8 #include "exec-cmd.h"
   9 #include "run-command.h"
  10 #include "pkt-line.h"
  11 #include "string-list.h"
  12 #include "sideband.h"
  13 #include "argv-array.h"
  14 #include "credential.h"
  15 #include "sha1-array.h"
  16 #include "send-pack.h"
  17 #include "protocol.h"
  18 #include "quote.h"
  19
  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         uintmax_t size = len;
 637         if (size > maximum_signed_value_of_type(curl_off_t))
 638                 die("cannot handle pushes this big");
 639         return (curl_off_t)size;
 640 }
 641
 642 static int post_rpc(struct rpc_state *rpc)
 643 {
 644         struct active_request_slot *slot;
 645         struct curl_slist *headers = http_copy_default_headers();
 646         int use_gzip = rpc->gzip_request;
 647         char *gzip_body = NULL;
 648         size_t gzip_size = 0;
 649         int err, large_request = 0;
 650         int needs_100_continue = 0;
 651         struct rpc_in_data rpc_in_data;
 652
 653         /* Try to load the entire request, if we can fit it into the
 654          * allocated buffer space we can use HTTP/1.0 and avoid the
 655          * chunked encoding mess.
 656          */
 657         while (1) {
 658                 size_t left = rpc->alloc - rpc->len;
 659                 char *buf = rpc->buf + rpc->len;
 660                 int n;
 661
 662                 if (left < LARGE_PACKET_MAX) {
 663                         large_request = 1;
 664                         use_gzip = 0;
 665                         break;
 666                 }
 667
 668                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 669                 if (!n)
 670                         break;
 671                 rpc->len += n;
 672         }
 673
 674         if (large_request) {
 675                 struct slot_results results;
 676
 677                 do {
 678                         err = probe_rpc(rpc, &results);
 679                         if (err == HTTP_REAUTH)
 680                                 credential_fill(&http_auth);
 681                 } while (err == HTTP_REAUTH);
 682                 if (err != HTTP_OK)
 683                         return -1;
 684
 685                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 686                         needs_100_continue = 1;
 687         }
 688
 689         headers = curl_slist_append(headers, rpc->hdr_content_type);
 690         headers = curl_slist_append(headers, rpc->hdr_accept);
 691         headers = curl_slist_append(headers, needs_100_continue ?
 692                 "Expect: 100-continue" : "Expect:");
 693
 694         /* Add the extra Git-Protocol header */
 695         if (rpc->protocol_header)
 696                 headers = curl_slist_append(headers, rpc->protocol_header);
 697
 698 retry:
 699         slot = get_active_slot();
 700
 701         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 702         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 703         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 704         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 705
 706         if (large_request) {
 707                 /* The request body is large and the size cannot be predicted.
 708                  * We must use chunked encoding to send it.
 709                  */
 710                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 711                 rpc->initial_buffer = 1;
 712                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 713                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 714 #ifndef NO_CURL_IOCTL
 715                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 716                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 717 #endif
 718                 if (options.verbosity > 1) {
 719                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 720                         fflush(stderr);
 721                 }
 722
 723         } else if (gzip_body) {
 724                 /*
 725                  * If we are looping to retry authentication, then the previous
 726                  * run will have set up the headers and gzip buffer already,
 727                  * and we just need to send it.
 728                  */
 729                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 730                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 731
 732         } else if (use_gzip && 1024 < rpc->len) {
 733                 /* The client backend isn't giving us compressed data so
 734                  * we can try to deflate it ourselves, this may save on
 735                  * the transfer time.
 736                  */
 737                 git_zstream stream;
 738                 int ret;
 739
 740                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 741                 gzip_size = git_deflate_bound(&stream, rpc->len);
 742                 gzip_body = xmalloc(gzip_size);
 743
 744                 stream.next_in = (unsigned char *)rpc->buf;
 745                 stream.avail_in = rpc->len;
 746                 stream.next_out = (unsigned char *)gzip_body;
 747                 stream.avail_out = gzip_size;
 748
 749                 ret = git_deflate(&stream, Z_FINISH);
 750                 if (ret != Z_STREAM_END)
 751                         die("cannot deflate request; zlib deflate error %d", ret);
 752
 753                 ret = git_deflate_end_gently(&stream);
 754                 if (ret != Z_OK)
 755                         die("cannot deflate request; zlib end error %d", ret);
 756
 757                 gzip_size = stream.total_out;
 758
 759                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 760                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 761                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 762
 763                 if (options.verbosity > 1) {
 764                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 765                                 rpc->service_name,
 766                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 767                         fflush(stderr);
 768                 }
 769         } else {
 770                 /* We know the complete request size in advance, use the
 771                  * more normal Content-Length approach.
 772                  */
 773                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 774                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 775                 if (options.verbosity > 1) {
 776                         fprintf(stderr, "POST %s (%lu bytes)\n",
 777                                 rpc->service_name, (unsigned long)rpc->len);
 778                         fflush(stderr);
 779                 }
 780         }
 781
 782         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 783         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 784         rpc_in_data.rpc = rpc;
 785         rpc_in_data.slot = slot;
 786         curl_easy_setopt(slot->curl, CURLOPT_FILE, &rpc_in_data);
 787         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
 788
 789
 790         rpc->any_written = 0;
 791         err = run_slot(slot, NULL);
 792         if (err == HTTP_REAUTH && !large_request) {
 793                 credential_fill(&http_auth);
 794                 goto retry;
 795         }
 796         if (err != HTTP_OK)
 797                 err = -1;
 798
 799         if (!rpc->any_written)
 800                 err = -1;
 801
 802         curl_slist_free_all(headers);
 803         free(gzip_body);
 804         return err;
 805 }
 806
 807 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 808 {
 809         const char *svc = rpc->service_name;
 810         struct strbuf buf = STRBUF_INIT;
 811         struct strbuf *preamble = rpc->stdin_preamble;
 812         struct child_process client = CHILD_PROCESS_INIT;
 813         int err = 0;
 814
 815         client.in = -1;
 816         client.out = -1;
 817         client.git_cmd = 1;
 818         client.argv = rpc->argv;
 819         if (start_command(&client))
 820                 exit(1);
 821         if (preamble)
 822                 write_or_die(client.in, preamble->buf, preamble->len);
 823         if (heads)
 824                 write_or_die(client.in, heads->buf, heads->len);
 825
 826         rpc->alloc = http_post_buffer;
 827         rpc->buf = xmalloc(rpc->alloc);
 828         rpc->in = client.in;
 829         rpc->out = client.out;
 830         strbuf_init(&rpc->result, 0);
 831
 832         strbuf_addf(&buf, "%s%s", url.buf, svc);
 833         rpc->service_url = strbuf_detach(&buf, NULL);
 834
 835         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 836         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 837
 838         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 839         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 840
 841         if (get_protocol_http_header(heads->version, &buf))
 842                 rpc->protocol_header = strbuf_detach(&buf, NULL);
 843         else
 844                 rpc->protocol_header = NULL;
 845
 846         while (!err) {
 847                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 848                 if (!n)
 849                         break;
 850                 rpc->pos = 0;
 851                 rpc->len = n;
 852                 err |= post_rpc(rpc);
 853         }
 854
 855         close(client.in);
 856         client.in = -1;
 857         if (!err) {
 858                 strbuf_read(&rpc->result, client.out, 0);
 859         } else {
 860                 char buf[4096];
 861                 for (;;)
 862                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 863                                 break;
 864         }
 865
 866         close(client.out);
 867         client.out = -1;
 868
 869         err |= finish_command(&client);
 870         free(rpc->service_url);
 871         free(rpc->hdr_content_type);
 872         free(rpc->hdr_accept);
 873         free(rpc->protocol_header);
 874         free(rpc->buf);
 875         strbuf_release(&buf);
 876         return err;
 877 }
 878
 879 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 880 {
 881         struct walker *walker;
 882         char **targets;
 883         int ret, i;
 884
 885         ALLOC_ARRAY(targets, nr_heads);
 886         if (options.depth || options.deepen_since)
 887                 die("dumb http transport does not support shallow capabilities");
 888         for (i = 0; i < nr_heads; i++)
 889                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 890
 891         walker = get_http_walker(url.buf);
 892         walker->get_verbosely = options.verbosity >= 3;
 893         walker->get_recover = 0;
 894         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 895         walker_free(walker);
 896
 897         for (i = 0; i < nr_heads; i++)
 898                 free(targets[i]);
 899         free(targets);
 900
 901         return ret ? error("fetch failed.") : 0;
 902 }
 903
 904 static int fetch_git(struct discovery *heads,
 905         int nr_heads, struct ref **to_fetch)
 906 {
 907         struct rpc_state rpc;
 908         struct strbuf preamble = STRBUF_INIT;
 909         int i, err;
 910         struct argv_array args = ARGV_ARRAY_INIT;
 911
 912         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 913                          "--stdin", "--lock-pack", NULL);
 914         if (options.followtags)
 915                 argv_array_push(&args, "--include-tag");
 916         if (options.thin)
 917                 argv_array_push(&args, "--thin");
 918         if (options.verbosity >= 3)
 919                 argv_array_pushl(&args, "-v", "-v", NULL);
 920         if (options.check_self_contained_and_connected)
 921                 argv_array_push(&args, "--check-self-contained-and-connected");
 922         if (options.cloning)
 923                 argv_array_push(&args, "--cloning");
 924         if (options.update_shallow)
 925                 argv_array_push(&args, "--update-shallow");
 926         if (!options.progress)
 927                 argv_array_push(&args, "--no-progress");
 928         if (options.depth)
 929                 argv_array_pushf(&args, "--depth=%lu", options.depth);
 930         if (options.deepen_since)
 931                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 932         for (i = 0; i < options.deepen_not.nr; i++)
 933                 argv_array_pushf(&args, "--shallow-exclude=%s",
 934                                  options.deepen_not.items[i].string);
 935         if (options.deepen_relative && options.depth)
 936                 argv_array_push(&args, "--deepen-relative");
 937         if (options.from_promisor)
 938                 argv_array_push(&args, "--from-promisor");
 939         if (options.no_dependents)
 940                 argv_array_push(&args, "--no-dependents");
 941         if (options.filter)
 942                 argv_array_pushf(&args, "--filter=%s", options.filter);
 943         argv_array_push(&args, url.buf);
 944
 945         for (i = 0; i < nr_heads; i++) {
 946                 struct ref *ref = to_fetch[i];
 947                 if (!*ref->name)
 948                         die("cannot fetch by sha1 over smart http");
 949                 packet_buf_write(&preamble, "%s %s\n",
 950                                  oid_to_hex(&ref->old_oid), ref->name);
 951         }
 952         packet_buf_flush(&preamble);
 953
 954         memset(&rpc, 0, sizeof(rpc));
 955         rpc.service_name = "git-upload-pack",
 956         rpc.argv = args.argv;
 957         rpc.stdin_preamble = &preamble;
 958         rpc.gzip_request = 1;
 959
 960         err = rpc_service(&rpc, heads);
 961         if (rpc.result.len)
 962                 write_or_die(1, rpc.result.buf, rpc.result.len);
 963         strbuf_release(&rpc.result);
 964         strbuf_release(&preamble);
 965         argv_array_clear(&args);
 966         return err;
 967 }
 968
 969 static int fetch(int nr_heads, struct ref **to_fetch)
 970 {
 971         struct discovery *d = discover_refs("git-upload-pack", 0);
 972         if (d->proto_git)
 973                 return fetch_git(d, nr_heads, to_fetch);
 974         else
 975                 return fetch_dumb(nr_heads, to_fetch);
 976 }
 977
 978 static void parse_fetch(struct strbuf *buf)
 979 {
 980         struct ref **to_fetch = NULL;
 981         struct ref *list_head = NULL;
 982         struct ref **list = &list_head;
 983         int alloc_heads = 0, nr_heads = 0;
 984
 985         do {
 986                 const char *p;
 987                 if (skip_prefix(buf->buf, "fetch ", &p)) {
 988                         const char *name;
 989                         struct ref *ref;
 990                         struct object_id old_oid;
 991
 992                         if (get_oid_hex(p, &old_oid))
 993                                 die("protocol error: expected sha/ref, got %s'", p);
 994                         if (p[GIT_SHA1_HEXSZ] == ' ')
 995                                 name = p + GIT_SHA1_HEXSZ + 1;
 996                         else if (!p[GIT_SHA1_HEXSZ])
 997                                 name = "";
 998                         else
 999                                 die("protocol error: expected sha/ref, got %s'", p);
1000
1001                         ref = alloc_ref(name);
1002                         oidcpy(&ref->old_oid, &old_oid);
1003
1004                         *list = ref;
1005                         list = &ref->next;
1006
1007                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1008                         to_fetch[nr_heads++] = ref;
1009                 }
1010                 else
1011                         die("http transport does not support %s", buf->buf);
1012
1013                 strbuf_reset(buf);
1014                 if (strbuf_getline_lf(buf, stdin) == EOF)
1015                         return;
1016                 if (!*buf->buf)
1017                         break;
1018         } while (1);
1019
1020         if (fetch(nr_heads, to_fetch))
1021                 exit(128); /* error already reported */
1022         free_refs(list_head);
1023         free(to_fetch);
1024
1025         printf("\n");
1026         fflush(stdout);
1027         strbuf_reset(buf);
1028 }
1029
1030 static int push_dav(int nr_spec, char **specs)
1031 {
1032         struct child_process child = CHILD_PROCESS_INIT;
1033         size_t i;
1034
1035         child.git_cmd = 1;
1036         argv_array_push(&child.args, "http-push");
1037         argv_array_push(&child.args, "--helper-status");
1038         if (options.dry_run)
1039                 argv_array_push(&child.args, "--dry-run");
1040         if (options.verbosity > 1)
1041                 argv_array_push(&child.args, "--verbose");
1042         argv_array_push(&child.args, url.buf);
1043         for (i = 0; i < nr_spec; i++)
1044                 argv_array_push(&child.args, specs[i]);
1045
1046         if (run_command(&child))
1047                 die("git-http-push failed");
1048         return 0;
1049 }
1050
1051 static int push_git(struct discovery *heads, int nr_spec, char **specs)
1052 {
1053         struct rpc_state rpc;
1054         int i, err;
1055         struct argv_array args;
1056         struct string_list_item *cas_option;
1057         struct strbuf preamble = STRBUF_INIT;
1058
1059         argv_array_init(&args);
1060         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1061                          NULL);
1062
1063         if (options.thin)
1064                 argv_array_push(&args, "--thin");
1065         if (options.dry_run)
1066                 argv_array_push(&args, "--dry-run");
1067         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1068                 argv_array_push(&args, "--signed=yes");
1069         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1070                 argv_array_push(&args, "--signed=if-asked");
1071         if (options.verbosity == 0)
1072                 argv_array_push(&args, "--quiet");
1073         else if (options.verbosity > 1)
1074                 argv_array_push(&args, "--verbose");
1075         for (i = 0; i < options.push_options.nr; i++)
1076                 argv_array_pushf(&args, "--push-option=%s",
1077                                  options.push_options.items[i].string);
1078         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1079         for_each_string_list_item(cas_option, &cas_options)
1080                 argv_array_push(&args, cas_option->string);
1081         argv_array_push(&args, url.buf);
1082
1083         argv_array_push(&args, "--stdin");
1084         for (i = 0; i < nr_spec; i++)
1085                 packet_buf_write(&preamble, "%s\n", specs[i]);
1086         packet_buf_flush(&preamble);
1087
1088         memset(&rpc, 0, sizeof(rpc));
1089         rpc.service_name = "git-receive-pack",
1090         rpc.argv = args.argv;
1091         rpc.stdin_preamble = &preamble;
1092
1093         err = rpc_service(&rpc, heads);
1094         if (rpc.result.len)
1095                 write_or_die(1, rpc.result.buf, rpc.result.len);
1096         strbuf_release(&rpc.result);
1097         strbuf_release(&preamble);
1098         argv_array_clear(&args);
1099         return err;
1100 }
1101
1102 static int push(int nr_spec, char **specs)
1103 {
1104         struct discovery *heads = discover_refs("git-receive-pack", 1);
1105         int ret;
1106
1107         if (heads->proto_git)
1108                 ret = push_git(heads, nr_spec, specs);
1109         else
1110                 ret = push_dav(nr_spec, specs);
1111         free_discovery(heads);
1112         return ret;
1113 }
1114
1115 static void parse_push(struct strbuf *buf)
1116 {
1117         char **specs = NULL;
1118         int alloc_spec = 0, nr_spec = 0, i, ret;
1119
1120         do {
1121                 if (starts_with(buf->buf, "push ")) {
1122                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1123                         specs[nr_spec++] = xstrdup(buf->buf + 5);
1124                 }
1125                 else
1126                         die("http transport does not support %s", buf->buf);
1127
1128                 strbuf_reset(buf);
1129                 if (strbuf_getline_lf(buf, stdin) == EOF)
1130                         goto free_specs;
1131                 if (!*buf->buf)
1132                         break;
1133         } while (1);
1134
1135         ret = push(nr_spec, specs);
1136         printf("\n");
1137         fflush(stdout);
1138
1139         if (ret)
1140                 exit(128); /* error already reported */
1141
1142  free_specs:
1143         for (i = 0; i < nr_spec; i++)
1144                 free(specs[i]);
1145         free(specs);
1146 }
1147
1148 /*
1149  * Used to represent the state of a connection to an HTTP server when
1150  * communicating using git's wire-protocol version 2.
1151  */
1152 struct proxy_state {
1153         char *service_name;
1154         char *service_url;
1155         struct curl_slist *headers;
1156         struct strbuf request_buffer;
1157         int in;
1158         int out;
1159         struct packet_reader reader;
1160         size_t pos;
1161         int seen_flush;
1162 };
1163
1164 static void proxy_state_init(struct proxy_state *p, const char *service_name,
1165                              enum protocol_version version)
1166 {
1167         struct strbuf buf = STRBUF_INIT;
1168
1169         memset(p, 0, sizeof(*p));
1170         p->service_name = xstrdup(service_name);
1171
1172         p->in = 0;
1173         p->out = 1;
1174         strbuf_init(&p->request_buffer, 0);
1175
1176         strbuf_addf(&buf, "%s%s", url.buf, p->service_name);
1177         p->service_url = strbuf_detach(&buf, NULL);
1178
1179         p->headers = http_copy_default_headers();
1180
1181         strbuf_addf(&buf, "Content-Type: application/x-%s-request", p->service_name);
1182         p->headers = curl_slist_append(p->headers, buf.buf);
1183         strbuf_reset(&buf);
1184
1185         strbuf_addf(&buf, "Accept: application/x-%s-result", p->service_name);
1186         p->headers = curl_slist_append(p->headers, buf.buf);
1187         strbuf_reset(&buf);
1188
1189         p->headers = curl_slist_append(p->headers, "Transfer-Encoding: chunked");
1190
1191         /* Add the Git-Protocol header */
1192         if (get_protocol_http_header(version, &buf))
1193                 p->headers = curl_slist_append(p->headers, buf.buf);
1194
1195         packet_reader_init(&p->reader, p->in, NULL, 0,
1196                            PACKET_READ_GENTLE_ON_EOF);
1197
1198         strbuf_release(&buf);
1199 }
1200
1201 static void proxy_state_clear(struct proxy_state *p)
1202 {
1203         free(p->service_name);
1204         free(p->service_url);
1205         curl_slist_free_all(p->headers);
1206         strbuf_release(&p->request_buffer);
1207 }
1208
1209 /*
1210  * CURLOPT_READFUNCTION callback function.
1211  * Attempts to copy over a single packet-line at a time into the
1212  * curl provided buffer.
1213  */
1214 static size_t proxy_in(char *buffer, size_t eltsize,
1215                        size_t nmemb, void *userdata)
1216 {
1217         size_t max;
1218         struct proxy_state *p = userdata;
1219         size_t avail = p->request_buffer.len - p->pos;
1220
1221
1222         if (eltsize != 1)
1223                 BUG("curl read callback called with size = %"PRIuMAX" != 1",
1224                     (uintmax_t)eltsize);
1225         max = nmemb;
1226
1227         if (!avail) {
1228                 if (p->seen_flush) {
1229                         p->seen_flush = 0;
1230                         return 0;
1231                 }
1232
1233                 strbuf_reset(&p->request_buffer);
1234                 switch (packet_reader_read(&p->reader)) {
1235                 case PACKET_READ_EOF:
1236                         die("unexpected EOF when reading from parent process");
1237                 case PACKET_READ_NORMAL:
1238                         packet_buf_write_len(&p->request_buffer, p->reader.line,
1239                                              p->reader.pktlen);
1240                         break;
1241                 case PACKET_READ_DELIM:
1242                         packet_buf_delim(&p->request_buffer);
1243                         break;
1244                 case PACKET_READ_FLUSH:
1245                         packet_buf_flush(&p->request_buffer);
1246                         p->seen_flush = 1;
1247                         break;
1248                 }
1249                 p->pos = 0;
1250                 avail = p->request_buffer.len;
1251         }
1252
1253         if (max < avail)
1254                 avail = max;
1255         memcpy(buffer, p->request_buffer.buf + p->pos, avail);
1256         p->pos += avail;
1257         return avail;
1258 }
1259
1260 static size_t proxy_out(char *buffer, size_t eltsize,
1261                         size_t nmemb, void *userdata)
1262 {
1263         size_t size;
1264         struct proxy_state *p = userdata;
1265
1266         if (eltsize != 1)
1267                 BUG("curl read callback called with size = %"PRIuMAX" != 1",
1268                     (uintmax_t)eltsize);
1269         size = nmemb;
1270
1271         write_or_die(p->out, buffer, size);
1272         return size;
1273 }
1274
1275 /* Issues a request to the HTTP server configured in `p` */
1276 static int proxy_request(struct proxy_state *p)
1277 {
1278         struct active_request_slot *slot;
1279
1280         slot = get_active_slot();
1281
1282         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1283         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1284         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
1285         curl_easy_setopt(slot->curl, CURLOPT_URL, p->service_url);
1286         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, p->headers);
1287
1288         /* Setup function to read request from client */
1289         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, proxy_in);
1290         curl_easy_setopt(slot->curl, CURLOPT_READDATA, p);
1291
1292         /* Setup function to write server response to client */
1293         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, proxy_out);
1294         curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, p);
1295
1296         if (run_slot(slot, NULL) != HTTP_OK)
1297                 return -1;
1298
1299         return 0;
1300 }
1301
1302 static int stateless_connect(const char *service_name)
1303 {
1304         struct discovery *discover;
1305         struct proxy_state p;
1306
1307         /*
1308          * Run the info/refs request and see if the server supports protocol
1309          * v2.  If and only if the server supports v2 can we successfully
1310          * establish a stateless connection, otherwise we need to tell the
1311          * client to fallback to using other transport helper functions to
1312          * complete their request.
1313          */
1314         discover = discover_refs(service_name, 0);
1315         if (discover->version != protocol_v2) {
1316                 printf("fallback\n");
1317                 fflush(stdout);
1318                 return -1;
1319         } else {
1320                 /* Stateless Connection established */
1321                 printf("\n");
1322                 fflush(stdout);
1323         }
1324
1325         proxy_state_init(&p, service_name, discover->version);
1326
1327         /*
1328          * Dump the capability listing that we got from the server earlier
1329          * during the info/refs request.
1330          */
1331         write_or_die(p.out, discover->buf, discover->len);
1332
1333         /* Peek the next packet line.  Until we see EOF keep sending POSTs */
1334         while (packet_reader_peek(&p.reader) != PACKET_READ_EOF) {
1335                 if (proxy_request(&p)) {
1336                         /* We would have an err here */
1337                         break;
1338                 }
1339         }
1340
1341         proxy_state_clear(&p);
1342         return 0;
1343 }
1344
1345 int cmd_main(int argc, const char **argv)
1346 {
1347         struct strbuf buf = STRBUF_INIT;
1348         int nongit;
1349
1350         setup_git_directory_gently(&nongit);
1351         if (argc < 2) {
1352                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
1353                 return 1;
1354         }
1355
1356         options.verbosity = 1;
1357         options.progress = !!isatty(2);
1358         options.thin = 1;
1359         string_list_init(&options.deepen_not, 1);
1360         string_list_init(&options.push_options, 1);
1361
1362         remote = remote_get(argv[1]);
1363
1364         if (argc > 2) {
1365                 end_url_with_slash(&url, argv[2]);
1366         } else {
1367                 end_url_with_slash(&url, remote->url[0]);
1368         }
1369
1370         http_init(remote, url.buf, 0);
1371
1372         do {
1373                 const char *arg;
1374
1375                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1376                         if (ferror(stdin))
1377                                 error("remote-curl: error reading command stream from git");
1378                         return 1;
1379                 }
1380                 if (buf.len == 0)
1381                         break;
1382                 if (starts_with(buf.buf, "fetch ")) {
1383                         if (nongit)
1384                                 die("remote-curl: fetch attempted without a local repo");
1385                         parse_fetch(&buf);
1386
1387                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1388                         int for_push = !!strstr(buf.buf + 4, "for-push");
1389                         output_refs(get_refs(for_push));
1390
1391                 } else if (starts_with(buf.buf, "push ")) {
1392                         parse_push(&buf);
1393
1394                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1395                         char *value = strchr(arg, ' ');
1396                         int result;
1397
1398                         if (value)
1399                                 *value++ = '\0';
1400                         else
1401                                 value = "true";
1402
1403                         result = set_option(arg, value);
1404                         if (!result)
1405                                 printf("ok\n");
1406                         else if (result < 0)
1407                                 printf("error invalid value\n");
1408                         else
1409                                 printf("unsupported\n");
1410                         fflush(stdout);
1411
1412                 } else if (!strcmp(buf.buf, "capabilities")) {
1413                         printf("stateless-connect\n");
1414                         printf("fetch\n");
1415                         printf("option\n");
1416                         printf("push\n");
1417                         printf("check-connectivity\n");
1418                         printf("\n");
1419                         fflush(stdout);
1420                 } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1421                         if (!stateless_connect(arg))
1422                                 break;
1423                 } else {
1424                         error("remote-curl: unknown command '%s' from git", buf.buf);
1425                         return 1;
1426                 }
1427                 strbuf_reset(&buf);
1428         } while (1);
1429
1430         http_cleanup();
1431
1432         return 0;
1433 }