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