remote-curl.c

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