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 "strvec.h"
  14 #include "credential.h"
  15 #include "oid-array.h"
  16 #include "send-pack.h"
  17 #include "protocol.h"
  18 #include "quote.h"
  19 #include "transport.h"
  20
  21 static struct remote *remote;
  22 /* always ends with a trailing slash */
  23 static struct strbuf url = STRBUF_INIT;
  24
  25 struct options {
  26         int verbosity;
  27         unsigned long depth;
  28         char *deepen_since;
  29         struct string_list deepen_not;
  30         struct string_list push_options;
  31         char *filter;
  32         unsigned progress : 1,
  33                 check_self_contained_and_connected : 1,
  34                 cloning : 1,
  35                 update_shallow : 1,
  36                 followtags : 1,
  37                 dry_run : 1,
  38                 thin : 1,
  39                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
  40                 push_cert : 2,
  41                 deepen_relative : 1,
  42                 from_promisor : 1,
  43                 no_dependents : 1,
  44                 atomic : 1,
  45                 object_format : 1;
  46         const struct git_hash_algo *hash_algo;
  47 };
  48 static struct options options;
  49 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  50
  51 static int set_option(const char *name, const char *value)
  52 {
  53         if (!strcmp(name, "verbosity")) {
  54                 char *end;
  55                 int v = strtol(value, &end, 10);
  56                 if (value == end || *end)
  57                         return -1;
  58                 options.verbosity = v;
  59                 return 0;
  60         }
  61         else if (!strcmp(name, "progress")) {
  62                 if (!strcmp(value, "true"))
  63                         options.progress = 1;
  64                 else if (!strcmp(value, "false"))
  65                         options.progress = 0;
  66                 else
  67                         return -1;
  68                 return 0;
  69         }
  70         else if (!strcmp(name, "depth")) {
  71                 char *end;
  72                 unsigned long v = strtoul(value, &end, 10);
  73                 if (value == end || *end)
  74                         return -1;
  75                 options.depth = v;
  76                 return 0;
  77         }
  78         else if (!strcmp(name, "deepen-since")) {
  79                 options.deepen_since = xstrdup(value);
  80                 return 0;
  81         }
  82         else if (!strcmp(name, "deepen-not")) {
  83                 string_list_append(&options.deepen_not, value);
  84                 return 0;
  85         }
  86         else if (!strcmp(name, "deepen-relative")) {
  87                 if (!strcmp(value, "true"))
  88                         options.deepen_relative = 1;
  89                 else if (!strcmp(value, "false"))
  90                         options.deepen_relative = 0;
  91                 else
  92                         return -1;
  93                 return 0;
  94         }
  95         else if (!strcmp(name, "followtags")) {
  96                 if (!strcmp(value, "true"))
  97                         options.followtags = 1;
  98                 else if (!strcmp(value, "false"))
  99                         options.followtags = 0;
 100                 else
 101                         return -1;
 102                 return 0;
 103         }
 104         else if (!strcmp(name, "dry-run")) {
 105                 if (!strcmp(value, "true"))
 106                         options.dry_run = 1;
 107                 else if (!strcmp(value, "false"))
 108                         options.dry_run = 0;
 109                 else
 110                         return -1;
 111                 return 0;
 112         }
 113         else if (!strcmp(name, "check-connectivity")) {
 114                 if (!strcmp(value, "true"))
 115                         options.check_self_contained_and_connected = 1;
 116                 else if (!strcmp(value, "false"))
 117                         options.check_self_contained_and_connected = 0;
 118                 else
 119                         return -1;
 120                 return 0;
 121         }
 122         else if (!strcmp(name, "cas")) {
 123                 struct strbuf val = STRBUF_INIT;
 124                 strbuf_addstr(&val, "--force-with-lease=");
 125                 if (*value != '"')
 126                         strbuf_addstr(&val, value);
 127                 else if (unquote_c_style(&val, value, NULL))
 128                         return -1;
 129                 string_list_append(&cas_options, val.buf);
 130                 strbuf_release(&val);
 131                 return 0;
 132         } else if (!strcmp(name, "cloning")) {
 133                 if (!strcmp(value, "true"))
 134                         options.cloning = 1;
 135                 else if (!strcmp(value, "false"))
 136                         options.cloning = 0;
 137                 else
 138                         return -1;
 139                 return 0;
 140         } else if (!strcmp(name, "update-shallow")) {
 141                 if (!strcmp(value, "true"))
 142                         options.update_shallow = 1;
 143                 else if (!strcmp(value, "false"))
 144                         options.update_shallow = 0;
 145                 else
 146                         return -1;
 147                 return 0;
 148         } else if (!strcmp(name, "pushcert")) {
 149                 if (!strcmp(value, "true"))
 150                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 151                 else if (!strcmp(value, "false"))
 152                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 153                 else if (!strcmp(value, "if-asked"))
 154                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 155                 else
 156                         return -1;
 157                 return 0;
 158         } else if (!strcmp(name, "atomic")) {
 159                 if (!strcmp(value, "true"))
 160                         options.atomic = 1;
 161                 else if (!strcmp(value, "false"))
 162                         options.atomic = 0;
 163                 else
 164                         return -1;
 165                 return 0;
 166         } else if (!strcmp(name, "push-option")) {
 167                 if (*value != '"')
 168                         string_list_append(&options.push_options, value);
 169                 else {
 170                         struct strbuf unquoted = STRBUF_INIT;
 171                         if (unquote_c_style(&unquoted, value, NULL) < 0)
 172                                 die(_("invalid quoting in push-option value: '%s'"), value);
 173                         string_list_append_nodup(&options.push_options,
 174                                                  strbuf_detach(&unquoted, NULL));
 175                 }
 176                 return 0;
 177
 178 #if LIBCURL_VERSION_NUM >= 0x070a08
 179         } else if (!strcmp(name, "family")) {
 180                 if (!strcmp(value, "ipv4"))
 181                         git_curl_ipresolve = CURL_IPRESOLVE_V4;
 182                 else if (!strcmp(value, "ipv6"))
 183                         git_curl_ipresolve = CURL_IPRESOLVE_V6;
 184                 else if (!strcmp(value, "all"))
 185                         git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 186                 else
 187                         return -1;
 188                 return 0;
 189 #endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 190         } else if (!strcmp(name, "from-promisor")) {
 191                 options.from_promisor = 1;
 192                 return 0;
 193         } else if (!strcmp(name, "no-dependents")) {
 194                 options.no_dependents = 1;
 195                 return 0;
 196         } else if (!strcmp(name, "filter")) {
 197                 options.filter = xstrdup(value);
 198                 return 0;
 199         } else if (!strcmp(name, "object-format")) {
 200                 int algo;
 201                 options.object_format = 1;
 202                 if (strcmp(value, "true")) {
 203                         algo = hash_algo_by_name(value);
 204                         if (algo == GIT_HASH_UNKNOWN)
 205                                 die("unknown object format '%s'", value);
 206                         options.hash_algo = &hash_algos[algo];
 207                 }
 208                 return 0;
 209         } else {
 210                 return 1 /* unsupported */;
 211         }
 212 }
 213
 214 struct discovery {
 215         char *service;
 216         char *buf_alloc;
 217         char *buf;
 218         size_t len;
 219         struct ref *refs;
 220         struct oid_array shallow;
 221         enum protocol_version version;
 222         unsigned proto_git : 1;
 223 };
 224 static struct discovery *last_discovery;
 225
 226 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 227 {
 228         struct ref *list = NULL;
 229         struct packet_reader reader;
 230
 231         packet_reader_init(&reader, -1, heads->buf, heads->len,
 232                            PACKET_READ_CHOMP_NEWLINE |
 233                            PACKET_READ_GENTLE_ON_EOF |
 234                            PACKET_READ_DIE_ON_ERR_PACKET);
 235
 236         heads->version = discover_version(&reader);
 237         switch (heads->version) {
 238         case protocol_v2:
 239                 /*
 240                  * Do nothing.  This isn't a list of refs but rather a
 241                  * capability advertisement.  Client would have run
 242                  * 'stateless-connect' so we'll dump this capability listing
 243                  * and let them request the refs themselves.
 244                  */
 245                 break;
 246         case protocol_v1:
 247         case protocol_v0:
 248                 get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
 249                                  NULL, &heads->shallow);
 250                 options.hash_algo = reader.hash_algo;
 251                 break;
 252         case protocol_unknown_version:
 253                 BUG("unknown protocol version");
 254         }
 255
 256         return list;
 257 }
 258
 259 static const struct git_hash_algo *detect_hash_algo(struct discovery *heads)
 260 {
 261         const char *p = memchr(heads->buf, '\t', heads->len);
 262         int algo;
 263         if (!p)
 264                 return the_hash_algo;
 265
 266         algo = hash_algo_by_length((p - heads->buf) / 2);
 267         if (algo == GIT_HASH_UNKNOWN)
 268                 return NULL;
 269         return &hash_algos[algo];
 270 }
 271
 272 static struct ref *parse_info_refs(struct discovery *heads)
 273 {
 274         char *data, *start, *mid;
 275         char *ref_name;
 276         int i = 0;
 277
 278         struct ref *refs = NULL;
 279         struct ref *ref = NULL;
 280         struct ref *last_ref = NULL;
 281
 282         options.hash_algo = detect_hash_algo(heads);
 283         if (!options.hash_algo)
 284                 die("%sinfo/refs not valid: could not determine hash algorithm; "
 285                     "is this a git repository?",
 286                     transport_anonymize_url(url.buf));
 287
 288         data = heads->buf;
 289         start = NULL;
 290         mid = data;
 291         while (i < heads->len) {
 292                 if (!start) {
 293                         start = &data[i];
 294                 }
 295                 if (data[i] == '\t')
 296                         mid = &data[i];
 297                 if (data[i] == '\n') {
 298                         if (mid - start != options.hash_algo->hexsz)
 299                                 die(_("%sinfo/refs not valid: is this a git repository?"),
 300                                     transport_anonymize_url(url.buf));
 301                         data[i] = 0;
 302                         ref_name = mid + 1;
 303                         ref = alloc_ref(ref_name);
 304                         get_oid_hex_algop(start, &ref->old_oid, options.hash_algo);
 305                         if (!refs)
 306                                 refs = ref;
 307                         if (last_ref)
 308                                 last_ref->next = ref;
 309                         last_ref = ref;
 310                         start = NULL;
 311                 }
 312                 i++;
 313         }
 314
 315         ref = alloc_ref("HEAD");
 316         if (!http_fetch_ref(url.buf, ref) &&
 317             !resolve_remote_symref(ref, refs)) {
 318                 ref->next = refs;
 319                 refs = ref;
 320         } else {
 321                 free(ref);
 322         }
 323
 324         return refs;
 325 }
 326
 327 static void free_discovery(struct discovery *d)
 328 {
 329         if (d) {
 330                 if (d == last_discovery)
 331                         last_discovery = NULL;
 332                 free(d->shallow.oid);
 333                 free(d->buf_alloc);
 334                 free_refs(d->refs);
 335                 free(d->service);
 336                 free(d);
 337         }
 338 }
 339
 340 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 341                              struct strbuf *msg)
 342 {
 343         const char *p, *eol;
 344
 345         /*
 346          * We only show text/plain parts, as other types are likely
 347          * to be ugly to look at on the user's terminal.
 348          */
 349         if (strcmp(type->buf, "text/plain"))
 350                 return -1;
 351         if (charset->len)
 352                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 353
 354         strbuf_trim(msg);
 355         if (!msg->len)
 356                 return -1;
 357
 358         p = msg->buf;
 359         do {
 360                 eol = strchrnul(p, '\n');
 361                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 362                 p = eol + 1;
 363         } while(*eol);
 364         return 0;
 365 }
 366
 367 static int get_protocol_http_header(enum protocol_version version,
 368                                     struct strbuf *header)
 369 {
 370         if (version > 0) {
 371                 strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
 372                             version);
 373
 374                 return 1;
 375         }
 376
 377         return 0;
 378 }
 379
 380 static void check_smart_http(struct discovery *d, const char *service,
 381                              struct strbuf *type)
 382 {
 383         const char *p;
 384         struct packet_reader reader;
 385
 386         /*
 387          * If we don't see x-$service-advertisement, then it's not smart-http.
 388          * But once we do, we commit to it and assume any other protocol
 389          * violations are hard errors.
 390          */
 391         if (!skip_prefix(type->buf, "application/x-", &p) ||
 392             !skip_prefix(p, service, &p) ||
 393             strcmp(p, "-advertisement"))
 394                 return;
 395
 396         packet_reader_init(&reader, -1, d->buf, d->len,
 397                            PACKET_READ_CHOMP_NEWLINE |
 398                            PACKET_READ_DIE_ON_ERR_PACKET);
 399         if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
 400                 die(_("invalid server response; expected service, got flush packet"));
 401
 402         if (skip_prefix(reader.line, "# service=", &p) && !strcmp(p, service)) {
 403                 /*
 404                  * The header can include additional metadata lines, up
 405                  * until a packet flush marker.  Ignore these now, but
 406                  * in the future we might start to scan them.
 407                  */
 408                 for (;;) {
 409                         packet_reader_read(&reader);
 410                         if (reader.pktlen <= 0) {
 411                                 break;
 412                         }
 413                 }
 414
 415                 /*
 416                  * v0 smart http; callers expect us to soak up the
 417                  * service and header packets
 418                  */
 419                 d->buf = reader.src_buffer;
 420                 d->len = reader.src_len;
 421                 d->proto_git = 1;
 422
 423         } else if (!strcmp(reader.line, "version 2")) {
 424                 /*
 425                  * v2 smart http; do not consume version packet, which will
 426                  * be handled elsewhere.
 427                  */
 428                 d->proto_git = 1;
 429
 430         } else {
 431                 die(_("invalid server response; got '%s'"), reader.line);
 432         }
 433 }
 434
 435 static struct discovery *discover_refs(const char *service, int for_push)
 436 {
 437         struct strbuf type = STRBUF_INIT;
 438         struct strbuf charset = STRBUF_INIT;
 439         struct strbuf buffer = STRBUF_INIT;
 440         struct strbuf refs_url = STRBUF_INIT;
 441         struct strbuf effective_url = STRBUF_INIT;
 442         struct strbuf protocol_header = STRBUF_INIT;
 443         struct string_list extra_headers = STRING_LIST_INIT_DUP;
 444         struct discovery *last = last_discovery;
 445         int http_ret, maybe_smart = 0;
 446         struct http_get_options http_options;
 447         enum protocol_version version = get_protocol_version_config();
 448
 449         if (last && !strcmp(service, last->service))
 450                 return last;
 451         free_discovery(last);
 452
 453         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 454         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 455              git_env_bool("GIT_SMART_HTTP", 1)) {
 456                 maybe_smart = 1;
 457                 if (!strchr(url.buf, '?'))
 458                         strbuf_addch(&refs_url, '?');
 459                 else
 460                         strbuf_addch(&refs_url, '&');
 461                 strbuf_addf(&refs_url, "service=%s", service);
 462         }
 463
 464         /*
 465          * NEEDSWORK: If we are trying to use protocol v2 and we are planning
 466          * to perform a push, then fallback to v0 since the client doesn't know
 467          * how to push yet using v2.
 468          */
 469         if (version == protocol_v2 && !strcmp("git-receive-pack", service))
 470                 version = protocol_v0;
 471
 472         /* Add the extra Git-Protocol header */
 473         if (get_protocol_http_header(version, &protocol_header))
 474                 string_list_append(&extra_headers, protocol_header.buf);
 475
 476         memset(&http_options, 0, sizeof(http_options));
 477         http_options.content_type = &type;
 478         http_options.charset = &charset;
 479         http_options.effective_url = &effective_url;
 480         http_options.base_url = &url;
 481         http_options.extra_headers = &extra_headers;
 482         http_options.initial_request = 1;
 483         http_options.no_cache = 1;
 484
 485         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 486         switch (http_ret) {
 487         case HTTP_OK:
 488                 break;
 489         case HTTP_MISSING_TARGET:
 490                 show_http_message(&type, &charset, &buffer);
 491                 die(_("repository '%s' not found"),
 492                     transport_anonymize_url(url.buf));
 493         case HTTP_NOAUTH:
 494                 show_http_message(&type, &charset, &buffer);
 495                 die(_("Authentication failed for '%s'"),
 496                     transport_anonymize_url(url.buf));
 497         default:
 498                 show_http_message(&type, &charset, &buffer);
 499                 die(_("unable to access '%s': %s"),
 500                     transport_anonymize_url(url.buf), curl_errorstr);
 501         }
 502
 503         if (options.verbosity && !starts_with(refs_url.buf, url.buf)) {
 504                 char *u = transport_anonymize_url(url.buf);
 505                 warning(_("redirecting to %s"), u);
 506                 free(u);
 507         }
 508
 509         last= xcalloc(1, sizeof(*last_discovery));
 510         last->service = xstrdup(service);
 511         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 512         last->buf = last->buf_alloc;
 513
 514         if (maybe_smart)
 515                 check_smart_http(last, service, &type);
 516
 517         if (last->proto_git)
 518                 last->refs = parse_git_refs(last, for_push);
 519         else
 520                 last->refs = parse_info_refs(last);
 521
 522         strbuf_release(&refs_url);
 523         strbuf_release(&type);
 524         strbuf_release(&charset);
 525         strbuf_release(&effective_url);
 526         strbuf_release(&buffer);
 527         strbuf_release(&protocol_header);
 528         string_list_clear(&extra_headers, 0);
 529         last_discovery = last;
 530         return last;
 531 }
 532
 533 static struct ref *get_refs(int for_push)
 534 {
 535         struct discovery *heads;
 536
 537         if (for_push)
 538                 heads = discover_refs("git-receive-pack", for_push);
 539         else
 540                 heads = discover_refs("git-upload-pack", for_push);
 541
 542         return heads->refs;
 543 }
 544
 545 static void output_refs(struct ref *refs)
 546 {
 547         struct ref *posn;
 548         if (options.object_format && options.hash_algo) {
 549                 printf(":object-format %s\n", options.hash_algo->name);
 550         }
 551         for (posn = refs; posn; posn = posn->next) {
 552                 if (posn->symref)
 553                         printf("@%s %s\n", posn->symref, posn->name);
 554                 else
 555                         printf("%s %s\n", hash_to_hex_algop(posn->old_oid.hash,
 556                                                             options.hash_algo),
 557                                           posn->name);
 558         }
 559         printf("\n");
 560         fflush(stdout);
 561 }
 562
 563 struct rpc_state {
 564         const char *service_name;
 565         char *service_url;
 566         char *hdr_content_type;
 567         char *hdr_accept;
 568         char *protocol_header;
 569         char *buf;
 570         size_t alloc;
 571         size_t len;
 572         size_t pos;
 573         int in;
 574         int out;
 575         int any_written;
 576         unsigned gzip_request : 1;
 577         unsigned initial_buffer : 1;
 578
 579         /*
 580          * Whenever a pkt-line is read into buf, append the 4 characters
 581          * denoting its length before appending the payload.
 582          */
 583         unsigned write_line_lengths : 1;
 584
 585         /*
 586          * Used by rpc_out; initialize to 0. This is true if a flush has been
 587          * read, but the corresponding line length (if write_line_lengths is
 588          * true) and EOF have not been sent to libcurl. Since each flush marks
 589          * the end of a request, each flush must be completely sent before any
 590          * further reading occurs.
 591          */
 592         unsigned flush_read_but_not_sent : 1;
 593 };
 594
 595 /*
 596  * Appends the result of reading from rpc->out to the string represented by
 597  * rpc->buf and rpc->len if there is enough space. Returns 1 if there was
 598  * enough space, 0 otherwise.
 599  *
 600  * If rpc->write_line_lengths is true, appends the line length as a 4-byte
 601  * hexadecimal string before appending the result described above.
 602  *
 603  * Writes the total number of bytes appended into appended.
 604  */
 605 static int rpc_read_from_out(struct rpc_state *rpc, int options,
 606                              size_t *appended,
 607                              enum packet_read_status *status) {
 608         size_t left;
 609         char *buf;
 610         int pktlen_raw;
 611
 612         if (rpc->write_line_lengths) {
 613                 left = rpc->alloc - rpc->len - 4;
 614                 buf = rpc->buf + rpc->len + 4;
 615         } else {
 616                 left = rpc->alloc - rpc->len;
 617                 buf = rpc->buf + rpc->len;
 618         }
 619
 620         if (left < LARGE_PACKET_MAX)
 621                 return 0;
 622
 623         *status = packet_read_with_status(rpc->out, NULL, NULL, buf,
 624                         left, &pktlen_raw, options);
 625         if (*status != PACKET_READ_EOF) {
 626                 *appended = pktlen_raw + (rpc->write_line_lengths ? 4 : 0);
 627                 rpc->len += *appended;
 628         }
 629
 630         if (rpc->write_line_lengths) {
 631                 switch (*status) {
 632                 case PACKET_READ_EOF:
 633                         if (!(options & PACKET_READ_GENTLE_ON_EOF))
 634                                 die(_("shouldn't have EOF when not gentle on EOF"));
 635                         break;
 636                 case PACKET_READ_NORMAL:
 637                         set_packet_header(buf - 4, *appended);
 638                         break;
 639                 case PACKET_READ_DELIM:
 640                         memcpy(buf - 4, "0001", 4);
 641                         break;
 642                 case PACKET_READ_FLUSH:
 643                         memcpy(buf - 4, "0000", 4);
 644                         break;
 645                 case PACKET_READ_RESPONSE_END:
 646                         die(_("remote server sent stateless separator"));
 647                 }
 648         }
 649
 650         return 1;
 651 }
 652
 653 static size_t rpc_out(void *ptr, size_t eltsize,
 654                 size_t nmemb, void *buffer_)
 655 {
 656         size_t max = eltsize * nmemb;
 657         struct rpc_state *rpc = buffer_;
 658         size_t avail = rpc->len - rpc->pos;
 659         enum packet_read_status status;
 660
 661         if (!avail) {
 662                 rpc->initial_buffer = 0;
 663                 rpc->len = 0;
 664                 rpc->pos = 0;
 665                 if (!rpc->flush_read_but_not_sent) {
 666                         if (!rpc_read_from_out(rpc, 0, &avail, &status))
 667                                 BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
 668                         if (status == PACKET_READ_FLUSH)
 669                                 rpc->flush_read_but_not_sent = 1;
 670                 }
 671                 /*
 672                  * If flush_read_but_not_sent is true, we have already read one
 673                  * full request but have not fully sent it + EOF, which is why
 674                  * we need to refrain from reading.
 675                  */
 676         }
 677         if (rpc->flush_read_but_not_sent) {
 678                 if (!avail) {
 679                         /*
 680                          * The line length either does not need to be sent at
 681                          * all or has already been completely sent. Now we can
 682                          * return 0, indicating EOF, meaning that the flush has
 683                          * been fully sent.
 684                          */
 685                         rpc->flush_read_but_not_sent = 0;
 686                         return 0;
 687                 }
 688                 /*
 689                  * If avail is non-zero, the line length for the flush still
 690                  * hasn't been fully sent. Proceed with sending the line
 691                  * length.
 692                  */
 693         }
 694
 695         if (max < avail)
 696                 avail = max;
 697         memcpy(ptr, rpc->buf + rpc->pos, avail);
 698         rpc->pos += avail;
 699         return avail;
 700 }
 701
 702 #ifndef NO_CURL_IOCTL
 703 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 704 {
 705         struct rpc_state *rpc = clientp;
 706
 707         switch (cmd) {
 708         case CURLIOCMD_NOP:
 709                 return CURLIOE_OK;
 710
 711         case CURLIOCMD_RESTARTREAD:
 712                 if (rpc->initial_buffer) {
 713                         rpc->pos = 0;
 714                         return CURLIOE_OK;
 715                 }
 716                 error(_("unable to rewind rpc post data - try increasing http.postBuffer"));
 717                 return CURLIOE_FAILRESTART;
 718
 719         default:
 720                 return CURLIOE_UNKNOWNCMD;
 721         }
 722 }
 723 #endif
 724
 725 struct check_pktline_state {
 726         char len_buf[4];
 727         int len_filled;
 728         int remaining;
 729 };
 730
 731 static void check_pktline(struct check_pktline_state *state, const char *ptr, size_t size)
 732 {
 733         while (size) {
 734                 if (!state->remaining) {
 735                         int digits_remaining = 4 - state->len_filled;
 736                         if (digits_remaining > size)
 737                                 digits_remaining = size;
 738                         memcpy(&state->len_buf[state->len_filled], ptr, digits_remaining);
 739                         state->len_filled += digits_remaining;
 740                         ptr += digits_remaining;
 741                         size -= digits_remaining;
 742
 743                         if (state->len_filled == 4) {
 744                                 state->remaining = packet_length(state->len_buf);
 745                                 if (state->remaining < 0) {
 746                                         die(_("remote-curl: bad line length character: %.4s"), state->len_buf);
 747                                 } else if (state->remaining == 2) {
 748                                         die(_("remote-curl: unexpected response end packet"));
 749                                 } else if (state->remaining < 4) {
 750                                         state->remaining = 0;
 751                                 } else {
 752                                         state->remaining -= 4;
 753                                 }
 754                                 state->len_filled = 0;
 755                         }
 756                 }
 757
 758                 if (state->remaining) {
 759                         int remaining = state->remaining;
 760                         if (remaining > size)
 761                                 remaining = size;
 762                         ptr += remaining;
 763                         size -= remaining;
 764                         state->remaining -= remaining;
 765                 }
 766         }
 767 }
 768
 769 struct rpc_in_data {
 770         struct rpc_state *rpc;
 771         struct active_request_slot *slot;
 772         int check_pktline;
 773         struct check_pktline_state pktline_state;
 774 };
 775
 776 /*
 777  * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
 778  * from ptr.
 779  */
 780 static size_t rpc_in(char *ptr, size_t eltsize,
 781                 size_t nmemb, void *buffer_)
 782 {
 783         size_t size = eltsize * nmemb;
 784         struct rpc_in_data *data = buffer_;
 785         long response_code;
 786
 787         if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
 788                               &response_code) != CURLE_OK)
 789                 return size;
 790         if (response_code >= 300)
 791                 return size;
 792         if (size)
 793                 data->rpc->any_written = 1;
 794         if (data->check_pktline)
 795                 check_pktline(&data->pktline_state, ptr, size);
 796         write_or_die(data->rpc->in, ptr, size);
 797         return size;
 798 }
 799
 800 static int run_slot(struct active_request_slot *slot,
 801                     struct slot_results *results)
 802 {
 803         int err;
 804         struct slot_results results_buf;
 805
 806         if (!results)
 807                 results = &results_buf;
 808
 809         err = run_one_slot(slot, results);
 810
 811         if (err != HTTP_OK && err != HTTP_REAUTH) {
 812                 struct strbuf msg = STRBUF_INIT;
 813                 if (results->http_code && results->http_code != 200)
 814                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 815                 if (results->curl_result != CURLE_OK) {
 816                         if (msg.len)
 817                                 strbuf_addch(&msg, ' ');
 818                         strbuf_addf(&msg, "curl %d", results->curl_result);
 819                         if (curl_errorstr[0]) {
 820                                 strbuf_addch(&msg, ' ');
 821                                 strbuf_addstr(&msg, curl_errorstr);
 822                         }
 823                 }
 824                 error(_("RPC failed; %s"), msg.buf);
 825                 strbuf_release(&msg);
 826         }
 827
 828         return err;
 829 }
 830
 831 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 832 {
 833         struct active_request_slot *slot;
 834         struct curl_slist *headers = http_copy_default_headers();
 835         struct strbuf buf = STRBUF_INIT;
 836         int err;
 837
 838         slot = get_active_slot();
 839
 840         headers = curl_slist_append(headers, rpc->hdr_content_type);
 841         headers = curl_slist_append(headers, rpc->hdr_accept);
 842
 843         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 844         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 845         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 846         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 847         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 848         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 849         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 850         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 851         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 852
 853         err = run_slot(slot, results);
 854
 855         curl_slist_free_all(headers);
 856         strbuf_release(&buf);
 857         return err;
 858 }
 859
 860 static curl_off_t xcurl_off_t(size_t len)
 861 {
 862         uintmax_t size = len;
 863         if (size > maximum_signed_value_of_type(curl_off_t))
 864                 die(_("cannot handle pushes this big"));
 865         return (curl_off_t)size;
 866 }
 867
 868 /*
 869  * If flush_received is true, do not attempt to read any more; just use what's
 870  * in rpc->buf.
 871  */
 872 static int post_rpc(struct rpc_state *rpc, int stateless_connect, int flush_received)
 873 {
 874         struct active_request_slot *slot;
 875         struct curl_slist *headers = http_copy_default_headers();
 876         int use_gzip = rpc->gzip_request;
 877         char *gzip_body = NULL;
 878         size_t gzip_size = 0;
 879         int err, large_request = 0;
 880         int needs_100_continue = 0;
 881         struct rpc_in_data rpc_in_data;
 882
 883         /* Try to load the entire request, if we can fit it into the
 884          * allocated buffer space we can use HTTP/1.0 and avoid the
 885          * chunked encoding mess.
 886          */
 887         if (!flush_received) {
 888                 while (1) {
 889                         size_t n;
 890                         enum packet_read_status status;
 891
 892                         if (!rpc_read_from_out(rpc, 0, &n, &status)) {
 893                                 large_request = 1;
 894                                 use_gzip = 0;
 895                                 break;
 896                         }
 897                         if (status == PACKET_READ_FLUSH)
 898                                 break;
 899                 }
 900         }
 901
 902         if (large_request) {
 903                 struct slot_results results;
 904
 905                 do {
 906                         err = probe_rpc(rpc, &results);
 907                         if (err == HTTP_REAUTH)
 908                                 credential_fill(&http_auth);
 909                 } while (err == HTTP_REAUTH);
 910                 if (err != HTTP_OK)
 911                         return -1;
 912
 913                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 914                         needs_100_continue = 1;
 915         }
 916
 917         headers = curl_slist_append(headers, rpc->hdr_content_type);
 918         headers = curl_slist_append(headers, rpc->hdr_accept);
 919         headers = curl_slist_append(headers, needs_100_continue ?
 920                 "Expect: 100-continue" : "Expect:");
 921
 922         /* Add the extra Git-Protocol header */
 923         if (rpc->protocol_header)
 924                 headers = curl_slist_append(headers, rpc->protocol_header);
 925
 926 retry:
 927         slot = get_active_slot();
 928
 929         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 930         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 931         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 932         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 933
 934         if (large_request) {
 935                 /* The request body is large and the size cannot be predicted.
 936                  * We must use chunked encoding to send it.
 937                  */
 938                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 939                 rpc->initial_buffer = 1;
 940                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 941                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 942 #ifndef NO_CURL_IOCTL
 943                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 944                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 945 #endif
 946                 if (options.verbosity > 1) {
 947                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 948                         fflush(stderr);
 949                 }
 950
 951         } else if (gzip_body) {
 952                 /*
 953                  * If we are looping to retry authentication, then the previous
 954                  * run will have set up the headers and gzip buffer already,
 955                  * and we just need to send it.
 956                  */
 957                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 958                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 959
 960         } else if (use_gzip && 1024 < rpc->len) {
 961                 /* The client backend isn't giving us compressed data so
 962                  * we can try to deflate it ourselves, this may save on
 963                  * the transfer time.
 964                  */
 965                 git_zstream stream;
 966                 int ret;
 967
 968                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 969                 gzip_size = git_deflate_bound(&stream, rpc->len);
 970                 gzip_body = xmalloc(gzip_size);
 971
 972                 stream.next_in = (unsigned char *)rpc->buf;
 973                 stream.avail_in = rpc->len;
 974                 stream.next_out = (unsigned char *)gzip_body;
 975                 stream.avail_out = gzip_size;
 976
 977                 ret = git_deflate(&stream, Z_FINISH);
 978                 if (ret != Z_STREAM_END)
 979                         die(_("cannot deflate request; zlib deflate error %d"), ret);
 980
 981                 ret = git_deflate_end_gently(&stream);
 982                 if (ret != Z_OK)
 983                         die(_("cannot deflate request; zlib end error %d"), ret);
 984
 985                 gzip_size = stream.total_out;
 986
 987                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 988                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 989                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 990
 991                 if (options.verbosity > 1) {
 992                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 993                                 rpc->service_name,
 994                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 995                         fflush(stderr);
 996                 }
 997         } else {
 998                 /* We know the complete request size in advance, use the
 999                  * more normal Content-Length approach.
1000                  */
1001                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
1002                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
1003                 if (options.verbosity > 1) {
1004                         fprintf(stderr, "POST %s (%lu bytes)\n",
1005                                 rpc->service_name, (unsigned long)rpc->len);
1006                         fflush(stderr);
1007                 }
1008         }
1009
1010         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1011         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
1012         rpc_in_data.rpc = rpc;
1013         rpc_in_data.slot = slot;
1014         rpc_in_data.check_pktline = stateless_connect;
1015         memset(&rpc_in_data.pktline_state, 0, sizeof(rpc_in_data.pktline_state));
1016         curl_easy_setopt(slot->curl, CURLOPT_FILE, &rpc_in_data);
1017         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1018
1019
1020         rpc->any_written = 0;
1021         err = run_slot(slot, NULL);
1022         if (err == HTTP_REAUTH && !large_request) {
1023                 credential_fill(&http_auth);
1024                 goto retry;
1025         }
1026         if (err != HTTP_OK)
1027                 err = -1;
1028
1029         if (!rpc->any_written)
1030                 err = -1;
1031
1032         if (rpc_in_data.pktline_state.len_filled)
1033                 err = error(_("%d bytes of length header were received"), rpc_in_data.pktline_state.len_filled);
1034         if (rpc_in_data.pktline_state.remaining)
1035                 err = error(_("%d bytes of body are still expected"), rpc_in_data.pktline_state.remaining);
1036
1037         if (stateless_connect)
1038                 packet_response_end(rpc->in);
1039
1040         curl_slist_free_all(headers);
1041         free(gzip_body);
1042         return err;
1043 }
1044
1045 static int rpc_service(struct rpc_state *rpc, struct discovery *heads,
1046                        const char **client_argv, const struct strbuf *preamble,
1047                        struct strbuf *rpc_result)
1048 {
1049         const char *svc = rpc->service_name;
1050         struct strbuf buf = STRBUF_INIT;
1051         struct child_process client = CHILD_PROCESS_INIT;
1052         int err = 0;
1053
1054         client.in = -1;
1055         client.out = -1;
1056         client.git_cmd = 1;
1057         client.argv = client_argv;
1058         if (start_command(&client))
1059                 exit(1);
1060         write_or_die(client.in, preamble->buf, preamble->len);
1061         if (heads)
1062                 write_or_die(client.in, heads->buf, heads->len);
1063
1064         rpc->alloc = http_post_buffer;
1065         rpc->buf = xmalloc(rpc->alloc);
1066         rpc->in = client.in;
1067         rpc->out = client.out;
1068
1069         strbuf_addf(&buf, "%s%s", url.buf, svc);
1070         rpc->service_url = strbuf_detach(&buf, NULL);
1071
1072         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
1073         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
1074
1075         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
1076         rpc->hdr_accept = strbuf_detach(&buf, NULL);
1077
1078         if (get_protocol_http_header(heads->version, &buf))
1079                 rpc->protocol_header = strbuf_detach(&buf, NULL);
1080         else
1081                 rpc->protocol_header = NULL;
1082
1083         while (!err) {
1084                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
1085                 if (!n)
1086                         break;
1087                 rpc->pos = 0;
1088                 rpc->len = n;
1089                 err |= post_rpc(rpc, 0, 0);
1090         }
1091
1092         close(client.in);
1093         client.in = -1;
1094         if (!err) {
1095                 strbuf_read(rpc_result, client.out, 0);
1096         } else {
1097                 char buf[4096];
1098                 for (;;)
1099                         if (xread(client.out, buf, sizeof(buf)) <= 0)
1100                                 break;
1101         }
1102
1103         close(client.out);
1104         client.out = -1;
1105
1106         err |= finish_command(&client);
1107         free(rpc->service_url);
1108         free(rpc->hdr_content_type);
1109         free(rpc->hdr_accept);
1110         free(rpc->protocol_header);
1111         free(rpc->buf);
1112         strbuf_release(&buf);
1113         return err;
1114 }
1115
1116 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
1117 {
1118         struct walker *walker;
1119         char **targets;
1120         int ret, i;
1121
1122         ALLOC_ARRAY(targets, nr_heads);
1123         if (options.depth || options.deepen_since)
1124                 die(_("dumb http transport does not support shallow capabilities"));
1125         for (i = 0; i < nr_heads; i++)
1126                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
1127
1128         walker = get_http_walker(url.buf);
1129         walker->get_verbosely = options.verbosity >= 3;
1130         walker->get_progress = options.progress;
1131         walker->get_recover = 0;
1132         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
1133         walker_free(walker);
1134
1135         for (i = 0; i < nr_heads; i++)
1136                 free(targets[i]);
1137         free(targets);
1138
1139         return ret ? error(_("fetch failed.")) : 0;
1140 }
1141
1142 static int fetch_git(struct discovery *heads,
1143         int nr_heads, struct ref **to_fetch)
1144 {
1145         struct rpc_state rpc;
1146         struct strbuf preamble = STRBUF_INIT;
1147         int i, err;
1148         struct strvec args = STRVEC_INIT;
1149         struct strbuf rpc_result = STRBUF_INIT;
1150
1151         strvec_pushl(&args, "fetch-pack", "--stateless-rpc",
1152                      "--stdin", "--lock-pack", NULL);
1153         if (options.followtags)
1154                 strvec_push(&args, "--include-tag");
1155         if (options.thin)
1156                 strvec_push(&args, "--thin");
1157         if (options.verbosity >= 3)
1158                 strvec_pushl(&args, "-v", "-v", NULL);
1159         if (options.check_self_contained_and_connected)
1160                 strvec_push(&args, "--check-self-contained-and-connected");
1161         if (options.cloning)
1162                 strvec_push(&args, "--cloning");
1163         if (options.update_shallow)
1164                 strvec_push(&args, "--update-shallow");
1165         if (!options.progress)
1166                 strvec_push(&args, "--no-progress");
1167         if (options.depth)
1168                 strvec_pushf(&args, "--depth=%lu", options.depth);
1169         if (options.deepen_since)
1170                 strvec_pushf(&args, "--shallow-since=%s", options.deepen_since);
1171         for (i = 0; i < options.deepen_not.nr; i++)
1172                 strvec_pushf(&args, "--shallow-exclude=%s",
1173                              options.deepen_not.items[i].string);
1174         if (options.deepen_relative && options.depth)
1175                 strvec_push(&args, "--deepen-relative");
1176         if (options.from_promisor)
1177                 strvec_push(&args, "--from-promisor");
1178         if (options.no_dependents)
1179                 strvec_push(&args, "--no-dependents");
1180         if (options.filter)
1181                 strvec_pushf(&args, "--filter=%s", options.filter);
1182         strvec_push(&args, url.buf);
1183
1184         for (i = 0; i < nr_heads; i++) {
1185                 struct ref *ref = to_fetch[i];
1186                 if (!*ref->name)
1187                         die(_("cannot fetch by sha1 over smart http"));
1188                 packet_buf_write(&preamble, "%s %s\n",
1189                                  oid_to_hex(&ref->old_oid), ref->name);
1190         }
1191         packet_buf_flush(&preamble);
1192
1193         memset(&rpc, 0, sizeof(rpc));
1194         rpc.service_name = "git-upload-pack",
1195         rpc.gzip_request = 1;
1196
1197         err = rpc_service(&rpc, heads, args.v, &preamble, &rpc_result);
1198         if (rpc_result.len)
1199                 write_or_die(1, rpc_result.buf, rpc_result.len);
1200         strbuf_release(&rpc_result);
1201         strbuf_release(&preamble);
1202         strvec_clear(&args);
1203         return err;
1204 }
1205
1206 static int fetch(int nr_heads, struct ref **to_fetch)
1207 {
1208         struct discovery *d = discover_refs("git-upload-pack", 0);
1209         if (d->proto_git)
1210                 return fetch_git(d, nr_heads, to_fetch);
1211         else
1212                 return fetch_dumb(nr_heads, to_fetch);
1213 }
1214
1215 static void parse_fetch(struct strbuf *buf)
1216 {
1217         struct ref **to_fetch = NULL;
1218         struct ref *list_head = NULL;
1219         struct ref **list = &list_head;
1220         int alloc_heads = 0, nr_heads = 0;
1221
1222         do {
1223                 const char *p;
1224                 if (skip_prefix(buf->buf, "fetch ", &p)) {
1225                         const char *name;
1226                         struct ref *ref;
1227                         struct object_id old_oid;
1228                         const char *q;
1229
1230                         if (parse_oid_hex(p, &old_oid, &q))
1231                                 die(_("protocol error: expected sha/ref, got '%s'"), p);
1232                         if (*q == ' ')
1233                                 name = q + 1;
1234                         else if (!*q)
1235                                 name = "";
1236                         else
1237                                 die(_("protocol error: expected sha/ref, got '%s'"), p);
1238
1239                         ref = alloc_ref(name);
1240                         oidcpy(&ref->old_oid, &old_oid);
1241
1242                         *list = ref;
1243                         list = &ref->next;
1244
1245                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1246                         to_fetch[nr_heads++] = ref;
1247                 }
1248                 else
1249                         die(_("http transport does not support %s"), buf->buf);
1250
1251                 strbuf_reset(buf);
1252                 if (strbuf_getline_lf(buf, stdin) == EOF)
1253                         return;
1254                 if (!*buf->buf)
1255                         break;
1256         } while (1);
1257
1258         if (fetch(nr_heads, to_fetch))
1259                 exit(128); /* error already reported */
1260         free_refs(list_head);
1261         free(to_fetch);
1262
1263         printf("\n");
1264         fflush(stdout);
1265         strbuf_reset(buf);
1266 }
1267
1268 static int push_dav(int nr_spec, const char **specs)
1269 {
1270         struct child_process child = CHILD_PROCESS_INIT;
1271         size_t i;
1272
1273         child.git_cmd = 1;
1274         strvec_push(&child.args, "http-push");
1275         strvec_push(&child.args, "--helper-status");
1276         if (options.dry_run)
1277                 strvec_push(&child.args, "--dry-run");
1278         if (options.verbosity > 1)
1279                 strvec_push(&child.args, "--verbose");
1280         strvec_push(&child.args, url.buf);
1281         for (i = 0; i < nr_spec; i++)
1282                 strvec_push(&child.args, specs[i]);
1283
1284         if (run_command(&child))
1285                 die(_("git-http-push failed"));
1286         return 0;
1287 }
1288
1289 static int push_git(struct discovery *heads, int nr_spec, const char **specs)
1290 {
1291         struct rpc_state rpc;
1292         int i, err;
1293         struct strvec args;
1294         struct string_list_item *cas_option;
1295         struct strbuf preamble = STRBUF_INIT;
1296         struct strbuf rpc_result = STRBUF_INIT;
1297
1298         strvec_init(&args);
1299         strvec_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1300                      NULL);
1301
1302         if (options.thin)
1303                 strvec_push(&args, "--thin");
1304         if (options.dry_run)
1305                 strvec_push(&args, "--dry-run");
1306         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1307                 strvec_push(&args, "--signed=yes");
1308         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1309                 strvec_push(&args, "--signed=if-asked");
1310         if (options.atomic)
1311                 strvec_push(&args, "--atomic");
1312         if (options.verbosity == 0)
1313                 strvec_push(&args, "--quiet");
1314         else if (options.verbosity > 1)
1315                 strvec_push(&args, "--verbose");
1316         for (i = 0; i < options.push_options.nr; i++)
1317                 strvec_pushf(&args, "--push-option=%s",
1318                              options.push_options.items[i].string);
1319         strvec_push(&args, options.progress ? "--progress" : "--no-progress");
1320         for_each_string_list_item(cas_option, &cas_options)
1321                 strvec_push(&args, cas_option->string);
1322         strvec_push(&args, url.buf);
1323
1324         strvec_push(&args, "--stdin");
1325         for (i = 0; i < nr_spec; i++)
1326                 packet_buf_write(&preamble, "%s\n", specs[i]);
1327         packet_buf_flush(&preamble);
1328
1329         memset(&rpc, 0, sizeof(rpc));
1330         rpc.service_name = "git-receive-pack",
1331
1332         err = rpc_service(&rpc, heads, args.v, &preamble, &rpc_result);
1333         if (rpc_result.len)
1334                 write_or_die(1, rpc_result.buf, rpc_result.len);
1335         strbuf_release(&rpc_result);
1336         strbuf_release(&preamble);
1337         strvec_clear(&args);
1338         return err;
1339 }
1340
1341 static int push(int nr_spec, const char **specs)
1342 {
1343         struct discovery *heads = discover_refs("git-receive-pack", 1);
1344         int ret;
1345
1346         if (heads->proto_git)
1347                 ret = push_git(heads, nr_spec, specs);
1348         else
1349                 ret = push_dav(nr_spec, specs);
1350         free_discovery(heads);
1351         return ret;
1352 }
1353
1354 static void parse_push(struct strbuf *buf)
1355 {
1356         struct strvec specs = STRVEC_INIT;
1357         int ret;
1358
1359         do {
1360                 const char *arg;
1361                 if (skip_prefix(buf->buf, "push ", &arg))
1362                         strvec_push(&specs, arg);
1363                 else
1364                         die(_("http transport does not support %s"), buf->buf);
1365
1366                 strbuf_reset(buf);
1367                 if (strbuf_getline_lf(buf, stdin) == EOF)
1368                         goto free_specs;
1369                 if (!*buf->buf)
1370                         break;
1371         } while (1);
1372
1373         ret = push(specs.nr, specs.v);
1374         printf("\n");
1375         fflush(stdout);
1376
1377         if (ret)
1378                 exit(128); /* error already reported */
1379
1380 free_specs:
1381         strvec_clear(&specs);
1382 }
1383
1384 static int stateless_connect(const char *service_name)
1385 {
1386         struct discovery *discover;
1387         struct rpc_state rpc;
1388         struct strbuf buf = STRBUF_INIT;
1389
1390         /*
1391          * Run the info/refs request and see if the server supports protocol
1392          * v2.  If and only if the server supports v2 can we successfully
1393          * establish a stateless connection, otherwise we need to tell the
1394          * client to fallback to using other transport helper functions to
1395          * complete their request.
1396          */
1397         discover = discover_refs(service_name, 0);
1398         if (discover->version != protocol_v2) {
1399                 printf("fallback\n");
1400                 fflush(stdout);
1401                 return -1;
1402         } else {
1403                 /* Stateless Connection established */
1404                 printf("\n");
1405                 fflush(stdout);
1406         }
1407
1408         rpc.service_name = service_name;
1409         rpc.service_url = xstrfmt("%s%s", url.buf, rpc.service_name);
1410         rpc.hdr_content_type = xstrfmt("Content-Type: application/x-%s-request", rpc.service_name);
1411         rpc.hdr_accept = xstrfmt("Accept: application/x-%s-result", rpc.service_name);
1412         if (get_protocol_http_header(discover->version, &buf)) {
1413                 rpc.protocol_header = strbuf_detach(&buf, NULL);
1414         } else {
1415                 rpc.protocol_header = NULL;
1416                 strbuf_release(&buf);
1417         }
1418         rpc.buf = xmalloc(http_post_buffer);
1419         rpc.alloc = http_post_buffer;
1420         rpc.len = 0;
1421         rpc.pos = 0;
1422         rpc.in = 1;
1423         rpc.out = 0;
1424         rpc.any_written = 0;
1425         rpc.gzip_request = 1;
1426         rpc.initial_buffer = 0;
1427         rpc.write_line_lengths = 1;
1428         rpc.flush_read_but_not_sent = 0;
1429
1430         /*
1431          * Dump the capability listing that we got from the server earlier
1432          * during the info/refs request.
1433          */
1434         write_or_die(rpc.in, discover->buf, discover->len);
1435
1436         /* Until we see EOF keep sending POSTs */
1437         while (1) {
1438                 size_t avail;
1439                 enum packet_read_status status;
1440
1441                 if (!rpc_read_from_out(&rpc, PACKET_READ_GENTLE_ON_EOF, &avail,
1442                                        &status))
1443                         BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
1444                 if (status == PACKET_READ_EOF)
1445                         break;
1446                 if (post_rpc(&rpc, 1, status == PACKET_READ_FLUSH))
1447                         /* We would have an err here */
1448                         break;
1449                 /* Reset the buffer for next request */
1450                 rpc.len = 0;
1451         }
1452
1453         free(rpc.service_url);
1454         free(rpc.hdr_content_type);
1455         free(rpc.hdr_accept);
1456         free(rpc.protocol_header);
1457         free(rpc.buf);
1458         strbuf_release(&buf);
1459
1460         return 0;
1461 }
1462
1463 int cmd_main(int argc, const char **argv)
1464 {
1465         struct strbuf buf = STRBUF_INIT;
1466         int nongit;
1467
1468         setup_git_directory_gently(&nongit);
1469         if (argc < 2) {
1470                 error(_("remote-curl: usage: git remote-curl <remote> [<url>]"));
1471                 return 1;
1472         }
1473
1474         options.verbosity = 1;
1475         options.progress = !!isatty(2);
1476         options.thin = 1;
1477         string_list_init(&options.deepen_not, 1);
1478         string_list_init(&options.push_options, 1);
1479
1480         /*
1481          * Just report "remote-curl" here (folding all the various aliases
1482          * ("git-remote-http", "git-remote-https", and etc.) here since they
1483          * are all just copies of the same actual executable.
1484          */
1485         trace2_cmd_name("remote-curl");
1486
1487         remote = remote_get(argv[1]);
1488
1489         if (argc > 2) {
1490                 end_url_with_slash(&url, argv[2]);
1491         } else {
1492                 end_url_with_slash(&url, remote->url[0]);
1493         }
1494
1495         http_init(remote, url.buf, 0);
1496
1497         do {
1498                 const char *arg;
1499
1500                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1501                         if (ferror(stdin))
1502                                 error(_("remote-curl: error reading command stream from git"));
1503                         return 1;
1504                 }
1505                 if (buf.len == 0)
1506                         break;
1507                 if (starts_with(buf.buf, "fetch ")) {
1508                         if (nongit)
1509                                 die(_("remote-curl: fetch attempted without a local repo"));
1510                         parse_fetch(&buf);
1511
1512                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1513                         int for_push = !!strstr(buf.buf + 4, "for-push");
1514                         output_refs(get_refs(for_push));
1515
1516                 } else if (starts_with(buf.buf, "push ")) {
1517                         parse_push(&buf);
1518
1519                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1520                         char *value = strchr(arg, ' ');
1521                         int result;
1522
1523                         if (value)
1524                                 *value++ = '\0';
1525                         else
1526                                 value = "true";
1527
1528                         result = set_option(arg, value);
1529                         if (!result)
1530                                 printf("ok\n");
1531                         else if (result < 0)
1532                                 printf("error invalid value\n");
1533                         else
1534                                 printf("unsupported\n");
1535                         fflush(stdout);
1536
1537                 } else if (!strcmp(buf.buf, "capabilities")) {
1538                         printf("stateless-connect\n");
1539                         printf("fetch\n");
1540                         printf("option\n");
1541                         printf("push\n");
1542                         printf("check-connectivity\n");
1543                         printf("object-format\n");
1544                         printf("\n");
1545                         fflush(stdout);
1546                 } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1547                         if (!stateless_connect(arg))
1548                                 break;
1549                 } else {
1550                         error(_("remote-curl: unknown command '%s' from git"), buf.buf);
1551                         return 1;
1552                 }
1553                 strbuf_reset(&buf);
1554         } while (1);
1555
1556         http_cleanup();
1557
1558         return 0;
1559 }