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                 force_if_includes : 1;
  49         const struct git_hash_algo *hash_algo;
  50 };
  51 static struct options options;
  52 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  53
  54 static int set_option(const char *name, const char *value)
  55 {
  56         if (!strcmp(name, "verbosity")) {
  57                 char *end;
  58                 int v = strtol(value, &end, 10);
  59                 if (value == end || *end)
  60                         return -1;
  61                 options.verbosity = v;
  62                 return 0;
  63         }
  64         else if (!strcmp(name, "progress")) {
  65                 if (!strcmp(value, "true"))
  66                         options.progress = 1;
  67                 else if (!strcmp(value, "false"))
  68                         options.progress = 0;
  69                 else
  70                         return -1;
  71                 return 0;
  72         }
  73         else if (!strcmp(name, "depth")) {
  74                 char *end;
  75                 unsigned long v = strtoul(value, &end, 10);
  76                 if (value == end || *end)
  77                         return -1;
  78                 options.depth = v;
  79                 return 0;
  80         }
  81         else if (!strcmp(name, "deepen-since")) {
  82                 options.deepen_since = xstrdup(value);
  83                 return 0;
  84         }
  85         else if (!strcmp(name, "deepen-not")) {
  86                 string_list_append(&options.deepen_not, value);
  87                 return 0;
  88         }
  89         else if (!strcmp(name, "deepen-relative")) {
  90                 if (!strcmp(value, "true"))
  91                         options.deepen_relative = 1;
  92                 else if (!strcmp(value, "false"))
  93                         options.deepen_relative = 0;
  94                 else
  95                         return -1;
  96                 return 0;
  97         }
  98         else if (!strcmp(name, "followtags")) {
  99                 if (!strcmp(value, "true"))
 100                         options.followtags = 1;
 101                 else if (!strcmp(value, "false"))
 102                         options.followtags = 0;
 103                 else
 104                         return -1;
 105                 return 0;
 106         }
 107         else if (!strcmp(name, "dry-run")) {
 108                 if (!strcmp(value, "true"))
 109                         options.dry_run = 1;
 110                 else if (!strcmp(value, "false"))
 111                         options.dry_run = 0;
 112                 else
 113                         return -1;
 114                 return 0;
 115         }
 116         else if (!strcmp(name, "check-connectivity")) {
 117                 if (!strcmp(value, "true"))
 118                         options.check_self_contained_and_connected = 1;
 119                 else if (!strcmp(value, "false"))
 120                         options.check_self_contained_and_connected = 0;
 121                 else
 122                         return -1;
 123                 return 0;
 124         }
 125         else if (!strcmp(name, "cas")) {
 126                 struct strbuf val = STRBUF_INIT;
 127                 strbuf_addstr(&val, "--force-with-lease=");
 128                 if (*value != '"')
 129                         strbuf_addstr(&val, value);
 130                 else if (unquote_c_style(&val, value, NULL))
 131                         return -1;
 132                 string_list_append(&cas_options, val.buf);
 133                 strbuf_release(&val);
 134                 return 0;
 135         } else if (!strcmp(name, TRANS_OPT_FORCE_IF_INCLUDES)) {
 136                 if (!strcmp(value, "true"))
 137                         options.force_if_includes = 1;
 138                 else if (!strcmp(value, "false"))
 139                         options.force_if_includes = 0;
 140                 else
 141                         return -1;
 142                 return 0;
 143         } else if (!strcmp(name, "cloning")) {
 144                 if (!strcmp(value, "true"))
 145                         options.cloning = 1;
 146                 else if (!strcmp(value, "false"))
 147                         options.cloning = 0;
 148                 else
 149                         return -1;
 150                 return 0;
 151         } else if (!strcmp(name, "update-shallow")) {
 152                 if (!strcmp(value, "true"))
 153                         options.update_shallow = 1;
 154                 else if (!strcmp(value, "false"))
 155                         options.update_shallow = 0;
 156                 else
 157                         return -1;
 158                 return 0;
 159         } else if (!strcmp(name, "pushcert")) {
 160                 if (!strcmp(value, "true"))
 161                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 162                 else if (!strcmp(value, "false"))
 163                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 164                 else if (!strcmp(value, "if-asked"))
 165                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 166                 else
 167                         return -1;
 168                 return 0;
 169         } else if (!strcmp(name, "atomic")) {
 170                 if (!strcmp(value, "true"))
 171                         options.atomic = 1;
 172                 else if (!strcmp(value, "false"))
 173                         options.atomic = 0;
 174                 else
 175                         return -1;
 176                 return 0;
 177         } else if (!strcmp(name, "push-option")) {
 178                 if (*value != '"')
 179                         string_list_append(&options.push_options, value);
 180                 else {
 181                         struct strbuf unquoted = STRBUF_INIT;
 182                         if (unquote_c_style(&unquoted, value, NULL) < 0)
 183                                 die(_("invalid quoting in push-option value: '%s'"), value);
 184                         string_list_append_nodup(&options.push_options,
 185                                                  strbuf_detach(&unquoted, NULL));
 186                 }
 187                 return 0;
 188
 189 #if LIBCURL_VERSION_NUM >= 0x070a08
 190         } else if (!strcmp(name, "family")) {
 191                 if (!strcmp(value, "ipv4"))
 192                         git_curl_ipresolve = CURL_IPRESOLVE_V4;
 193                 else if (!strcmp(value, "ipv6"))
 194                         git_curl_ipresolve = CURL_IPRESOLVE_V6;
 195                 else if (!strcmp(value, "all"))
 196                         git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 197                 else
 198                         return -1;
 199                 return 0;
 200 #endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 201         } else if (!strcmp(name, "from-promisor")) {
 202                 options.from_promisor = 1;
 203                 return 0;
 204         } else if (!strcmp(name, "filter")) {
 205                 options.filter = xstrdup(value);
 206                 return 0;
 207         } else if (!strcmp(name, "object-format")) {
 208                 int algo;
 209                 options.object_format = 1;
 210                 if (strcmp(value, "true")) {
 211                         algo = hash_algo_by_name(value);
 212                         if (algo == GIT_HASH_UNKNOWN)
 213                                 die("unknown object format '%s'", value);
 214                         options.hash_algo = &hash_algos[algo];
 215                 }
 216                 return 0;
 217         } else {
 218                 return 1 /* unsupported */;
 219         }
 220 }
 221
 222 struct discovery {
 223         char *service;
 224         char *buf_alloc;
 225         char *buf;
 226         size_t len;
 227         struct ref *refs;
 228         struct oid_array shallow;
 229         enum protocol_version version;
 230         unsigned proto_git : 1;
 231 };
 232 static struct discovery *last_discovery;
 233
 234 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 235 {
 236         struct ref *list = NULL;
 237         struct packet_reader reader;
 238
 239         packet_reader_init(&reader, -1, heads->buf, heads->len,
 240                            PACKET_READ_CHOMP_NEWLINE |
 241                            PACKET_READ_GENTLE_ON_EOF |
 242                            PACKET_READ_DIE_ON_ERR_PACKET);
 243
 244         heads->version = discover_version(&reader);
 245         switch (heads->version) {
 246         case protocol_v2:
 247                 /*
 248                  * Do nothing.  This isn't a list of refs but rather a
 249                  * capability advertisement.  Client would have run
 250                  * 'stateless-connect' so we'll dump this capability listing
 251                  * and let them request the refs themselves.
 252                  */
 253                 break;
 254         case protocol_v1:
 255         case protocol_v0:
 256                 get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
 257                                  NULL, &heads->shallow);
 258                 options.hash_algo = reader.hash_algo;
 259                 break;
 260         case protocol_unknown_version:
 261                 BUG("unknown protocol version");
 262         }
 263
 264         return list;
 265 }
 266
 267 static const struct git_hash_algo *detect_hash_algo(struct discovery *heads)
 268 {
 269         const char *p = memchr(heads->buf, '\t', heads->len);
 270         int algo;
 271         if (!p)
 272                 return the_hash_algo;
 273
 274         algo = hash_algo_by_length((p - heads->buf) / 2);
 275         if (algo == GIT_HASH_UNKNOWN)
 276                 return NULL;
 277         return &hash_algos[algo];
 278 }
 279
 280 static struct ref *parse_info_refs(struct discovery *heads)
 281 {
 282         char *data, *start, *mid;
 283         char *ref_name;
 284         int i = 0;
 285
 286         struct ref *refs = NULL;
 287         struct ref *ref = NULL;
 288         struct ref *last_ref = NULL;
 289
 290         options.hash_algo = detect_hash_algo(heads);
 291         if (!options.hash_algo)
 292                 die("%sinfo/refs not valid: could not determine hash algorithm; "
 293                     "is this a git repository?",
 294                     transport_anonymize_url(url.buf));
 295
 296         data = heads->buf;
 297         start = NULL;
 298         mid = data;
 299         while (i < heads->len) {
 300                 if (!start) {
 301                         start = &data[i];
 302                 }
 303                 if (data[i] == '\t')
 304                         mid = &data[i];
 305                 if (data[i] == '\n') {
 306                         if (mid - start != options.hash_algo->hexsz)
 307                                 die(_("%sinfo/refs not valid: is this a git repository?"),
 308                                     transport_anonymize_url(url.buf));
 309                         data[i] = 0;
 310                         ref_name = mid + 1;
 311                         ref = alloc_ref(ref_name);
 312                         get_oid_hex_algop(start, &ref->old_oid, options.hash_algo);
 313                         if (!refs)
 314                                 refs = ref;
 315                         if (last_ref)
 316                                 last_ref->next = ref;
 317                         last_ref = ref;
 318                         start = NULL;
 319                 }
 320                 i++;
 321         }
 322
 323         ref = alloc_ref("HEAD");
 324         if (!http_fetch_ref(url.buf, ref) &&
 325             !resolve_remote_symref(ref, refs)) {
 326                 ref->next = refs;
 327                 refs = ref;
 328         } else {
 329                 free(ref);
 330         }
 331
 332         return refs;
 333 }
 334
 335 static void free_discovery(struct discovery *d)
 336 {
 337         if (d) {
 338                 if (d == last_discovery)
 339                         last_discovery = NULL;
 340                 free(d->shallow.oid);
 341                 free(d->buf_alloc);
 342                 free_refs(d->refs);
 343                 free(d->service);
 344                 free(d);
 345         }
 346 }
 347
 348 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 349                              struct strbuf *msg)
 350 {
 351         const char *p, *eol;
 352
 353         /*
 354          * We only show text/plain parts, as other types are likely
 355          * to be ugly to look at on the user's terminal.
 356          */
 357         if (strcmp(type->buf, "text/plain"))
 358                 return -1;
 359         if (charset->len)
 360                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 361
 362         strbuf_trim(msg);
 363         if (!msg->len)
 364                 return -1;
 365
 366         p = msg->buf;
 367         do {
 368                 eol = strchrnul(p, '\n');
 369                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 370                 p = eol + 1;
 371         } while(*eol);
 372         return 0;
 373 }
 374
 375 static int get_protocol_http_header(enum protocol_version version,
 376                                     struct strbuf *header)
 377 {
 378         if (version > 0) {
 379                 strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
 380                             version);
 381
 382                 return 1;
 383         }
 384
 385         return 0;
 386 }
 387
 388 static void check_smart_http(struct discovery *d, const char *service,
 389                              struct strbuf *type)
 390 {
 391         const char *p;
 392         struct packet_reader reader;
 393
 394         /*
 395          * If we don't see x-$service-advertisement, then it's not smart-http.
 396          * But once we do, we commit to it and assume any other protocol
 397          * violations are hard errors.
 398          */
 399         if (!skip_prefix(type->buf, "application/x-", &p) ||
 400             !skip_prefix(p, service, &p) ||
 401             strcmp(p, "-advertisement"))
 402                 return;
 403
 404         packet_reader_init(&reader, -1, d->buf, d->len,
 405                            PACKET_READ_CHOMP_NEWLINE |
 406                            PACKET_READ_DIE_ON_ERR_PACKET);
 407         if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
 408                 die(_("invalid server response; expected service, got flush packet"));
 409
 410         if (skip_prefix(reader.line, "# service=", &p) && !strcmp(p, service)) {
 411                 /*
 412                  * The header can include additional metadata lines, up
 413                  * until a packet flush marker.  Ignore these now, but
 414                  * in the future we might start to scan them.
 415                  */
 416                 for (;;) {
 417                         packet_reader_read(&reader);
 418                         if (reader.pktlen <= 0) {
 419                                 break;
 420                         }
 421                 }
 422
 423                 /*
 424                  * v0 smart http; callers expect us to soak up the
 425                  * service and header packets
 426                  */
 427                 d->buf = reader.src_buffer;
 428                 d->len = reader.src_len;
 429                 d->proto_git = 1;
 430
 431         } else if (!strcmp(reader.line, "version 2")) {
 432                 /*
 433                  * v2 smart http; do not consume version packet, which will
 434                  * be handled elsewhere.
 435                  */
 436                 d->proto_git = 1;
 437
 438         } else {
 439                 die(_("invalid server response; got '%s'"), reader.line);
 440         }
 441 }
 442
 443 static struct discovery *discover_refs(const char *service, int for_push)
 444 {
 445         struct strbuf type = STRBUF_INIT;
 446         struct strbuf charset = STRBUF_INIT;
 447         struct strbuf buffer = STRBUF_INIT;
 448         struct strbuf refs_url = STRBUF_INIT;
 449         struct strbuf effective_url = STRBUF_INIT;
 450         struct strbuf protocol_header = STRBUF_INIT;
 451         struct string_list extra_headers = STRING_LIST_INIT_DUP;
 452         struct discovery *last = last_discovery;
 453         int http_ret, maybe_smart = 0;
 454         struct http_get_options http_options;
 455         enum protocol_version version = get_protocol_version_config();
 456
 457         if (last && !strcmp(service, last->service))
 458                 return last;
 459         free_discovery(last);
 460
 461         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 462         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 463              git_env_bool("GIT_SMART_HTTP", 1)) {
 464                 maybe_smart = 1;
 465                 if (!strchr(url.buf, '?'))
 466                         strbuf_addch(&refs_url, '?');
 467                 else
 468                         strbuf_addch(&refs_url, '&');
 469                 strbuf_addf(&refs_url, "service=%s", service);
 470         }
 471
 472         /*
 473          * NEEDSWORK: If we are trying to use protocol v2 and we are planning
 474          * to perform a push, then fallback to v0 since the client doesn't know
 475          * how to push yet using v2.
 476          */
 477         if (version == protocol_v2 && !strcmp("git-receive-pack", service))
 478                 version = protocol_v0;
 479
 480         /* Add the extra Git-Protocol header */
 481         if (get_protocol_http_header(version, &protocol_header))
 482                 string_list_append(&extra_headers, protocol_header.buf);
 483
 484         memset(&http_options, 0, sizeof(http_options));
 485         http_options.content_type = &type;
 486         http_options.charset = &charset;
 487         http_options.effective_url = &effective_url;
 488         http_options.base_url = &url;
 489         http_options.extra_headers = &extra_headers;
 490         http_options.initial_request = 1;
 491         http_options.no_cache = 1;
 492
 493         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 494         switch (http_ret) {
 495         case HTTP_OK:
 496                 break;
 497         case HTTP_MISSING_TARGET:
 498                 show_http_message(&type, &charset, &buffer);
 499                 die(_("repository '%s' not found"),
 500                     transport_anonymize_url(url.buf));
 501         case HTTP_NOAUTH:
 502                 show_http_message(&type, &charset, &buffer);
 503                 die(_("Authentication failed for '%s'"),
 504                     transport_anonymize_url(url.buf));
 505         default:
 506                 show_http_message(&type, &charset, &buffer);
 507                 die(_("unable to access '%s': %s"),
 508                     transport_anonymize_url(url.buf), curl_errorstr);
 509         }
 510
 511         if (options.verbosity && !starts_with(refs_url.buf, url.buf)) {
 512                 char *u = transport_anonymize_url(url.buf);
 513                 warning(_("redirecting to %s"), u);
 514                 free(u);
 515         }
 516
 517         last= xcalloc(1, sizeof(*last_discovery));
 518         last->service = xstrdup(service);
 519         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 520         last->buf = last->buf_alloc;
 521
 522         if (maybe_smart)
 523                 check_smart_http(last, service, &type);
 524
 525         if (last->proto_git)
 526                 last->refs = parse_git_refs(last, for_push);
 527         else
 528                 last->refs = parse_info_refs(last);
 529
 530         strbuf_release(&refs_url);
 531         strbuf_release(&type);
 532         strbuf_release(&charset);
 533         strbuf_release(&effective_url);
 534         strbuf_release(&buffer);
 535         strbuf_release(&protocol_header);
 536         string_list_clear(&extra_headers, 0);
 537         last_discovery = last;
 538         return last;
 539 }
 540
 541 static struct ref *get_refs(int for_push)
 542 {
 543         struct discovery *heads;
 544
 545         if (for_push)
 546                 heads = discover_refs("git-receive-pack", for_push);
 547         else
 548                 heads = discover_refs("git-upload-pack", for_push);
 549
 550         return heads->refs;
 551 }
 552
 553 static void output_refs(struct ref *refs)
 554 {
 555         struct ref *posn;
 556         if (options.object_format && options.hash_algo) {
 557                 printf(":object-format %s\n", options.hash_algo->name);
 558                 repo_set_hash_algo(the_repository,
 559                                 hash_algo_by_ptr(options.hash_algo));
 560         }
 561         for (posn = refs; posn; posn = posn->next) {
 562                 if (posn->symref)
 563                         printf("@%s %s\n", posn->symref, posn->name);
 564                 else
 565                         printf("%s %s\n", hash_to_hex_algop(posn->old_oid.hash,
 566                                                             options.hash_algo),
 567                                           posn->name);
 568         }
 569         printf("\n");
 570         fflush(stdout);
 571 }
 572
 573 struct rpc_state {
 574         const char *service_name;
 575         char *service_url;
 576         char *hdr_content_type;
 577         char *hdr_accept;
 578         char *protocol_header;
 579         char *buf;
 580         size_t alloc;
 581         size_t len;
 582         size_t pos;
 583         int in;
 584         int out;
 585         int any_written;
 586         unsigned gzip_request : 1;
 587         unsigned initial_buffer : 1;
 588
 589         /*
 590          * Whenever a pkt-line is read into buf, append the 4 characters
 591          * denoting its length before appending the payload.
 592          */
 593         unsigned write_line_lengths : 1;
 594
 595         /*
 596          * Used by rpc_out; initialize to 0. This is true if a flush has been
 597          * read, but the corresponding line length (if write_line_lengths is
 598          * true) and EOF have not been sent to libcurl. Since each flush marks
 599          * the end of a request, each flush must be completely sent before any
 600          * further reading occurs.
 601          */
 602         unsigned flush_read_but_not_sent : 1;
 603 };
 604
 605 /*
 606  * Appends the result of reading from rpc->out to the string represented by
 607  * rpc->buf and rpc->len if there is enough space. Returns 1 if there was
 608  * enough space, 0 otherwise.
 609  *
 610  * If rpc->write_line_lengths is true, appends the line length as a 4-byte
 611  * hexadecimal string before appending the result described above.
 612  *
 613  * Writes the total number of bytes appended into appended.
 614  */
 615 static int rpc_read_from_out(struct rpc_state *rpc, int options,
 616                              size_t *appended,
 617                              enum packet_read_status *status) {
 618         size_t left;
 619         char *buf;
 620         int pktlen_raw;
 621
 622         if (rpc->write_line_lengths) {
 623                 left = rpc->alloc - rpc->len - 4;
 624                 buf = rpc->buf + rpc->len + 4;
 625         } else {
 626                 left = rpc->alloc - rpc->len;
 627                 buf = rpc->buf + rpc->len;
 628         }
 629
 630         if (left < LARGE_PACKET_MAX)
 631                 return 0;
 632
 633         *status = packet_read_with_status(rpc->out, NULL, NULL, buf,
 634                         left, &pktlen_raw, options);
 635         if (*status != PACKET_READ_EOF) {
 636                 *appended = pktlen_raw + (rpc->write_line_lengths ? 4 : 0);
 637                 rpc->len += *appended;
 638         }
 639
 640         if (rpc->write_line_lengths) {
 641                 switch (*status) {
 642                 case PACKET_READ_EOF:
 643                         if (!(options & PACKET_READ_GENTLE_ON_EOF))
 644                                 die(_("shouldn't have EOF when not gentle on EOF"));
 645                         break;
 646                 case PACKET_READ_NORMAL:
 647                         set_packet_header(buf - 4, *appended);
 648                         break;
 649                 case PACKET_READ_DELIM:
 650                         memcpy(buf - 4, "0001", 4);
 651                         break;
 652                 case PACKET_READ_FLUSH:
 653                         memcpy(buf - 4, "0000", 4);
 654                         break;
 655                 case PACKET_READ_RESPONSE_END:
 656                         die(_("remote server sent unexpected response end packet"));
 657                 }
 658         }
 659
 660         return 1;
 661 }
 662
 663 static size_t rpc_out(void *ptr, size_t eltsize,
 664                 size_t nmemb, void *buffer_)
 665 {
 666         size_t max = eltsize * nmemb;
 667         struct rpc_state *rpc = buffer_;
 668         size_t avail = rpc->len - rpc->pos;
 669         enum packet_read_status status;
 670
 671         if (!avail) {
 672                 rpc->initial_buffer = 0;
 673                 rpc->len = 0;
 674                 rpc->pos = 0;
 675                 if (!rpc->flush_read_but_not_sent) {
 676                         if (!rpc_read_from_out(rpc, 0, &avail, &status))
 677                                 BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
 678                         if (status == PACKET_READ_FLUSH)
 679                                 rpc->flush_read_but_not_sent = 1;
 680                 }
 681                 /*
 682                  * If flush_read_but_not_sent is true, we have already read one
 683                  * full request but have not fully sent it + EOF, which is why
 684                  * we need to refrain from reading.
 685                  */
 686         }
 687         if (rpc->flush_read_but_not_sent) {
 688                 if (!avail) {
 689                         /*
 690                          * The line length either does not need to be sent at
 691                          * all or has already been completely sent. Now we can
 692                          * return 0, indicating EOF, meaning that the flush has
 693                          * been fully sent.
 694                          */
 695                         rpc->flush_read_but_not_sent = 0;
 696                         return 0;
 697                 }
 698                 /*
 699                  * If avail is non-zero, the line length for the flush still
 700                  * hasn't been fully sent. Proceed with sending the line
 701                  * length.
 702                  */
 703         }
 704
 705         if (max < avail)
 706                 avail = max;
 707         memcpy(ptr, rpc->buf + rpc->pos, avail);
 708         rpc->pos += avail;
 709         return avail;
 710 }
 711
 712 #ifndef NO_CURL_IOCTL
 713 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 714 {
 715         struct rpc_state *rpc = clientp;
 716
 717         switch (cmd) {
 718         case CURLIOCMD_NOP:
 719                 return CURLIOE_OK;
 720
 721         case CURLIOCMD_RESTARTREAD:
 722                 if (rpc->initial_buffer) {
 723                         rpc->pos = 0;
 724                         return CURLIOE_OK;
 725                 }
 726                 error(_("unable to rewind rpc post data - try increasing http.postBuffer"));
 727                 return CURLIOE_FAILRESTART;
 728
 729         default:
 730                 return CURLIOE_UNKNOWNCMD;
 731         }
 732 }
 733 #endif
 734
 735 struct check_pktline_state {
 736         char len_buf[4];
 737         int len_filled;
 738         int remaining;
 739 };
 740
 741 static void check_pktline(struct check_pktline_state *state, const char *ptr, size_t size)
 742 {
 743         while (size) {
 744                 if (!state->remaining) {
 745                         int digits_remaining = 4 - state->len_filled;
 746                         if (digits_remaining > size)
 747                                 digits_remaining = size;
 748                         memcpy(&state->len_buf[state->len_filled], ptr, digits_remaining);
 749                         state->len_filled += digits_remaining;
 750                         ptr += digits_remaining;
 751                         size -= digits_remaining;
 752
 753                         if (state->len_filled == 4) {
 754                                 state->remaining = packet_length(state->len_buf);
 755                                 if (state->remaining < 0) {
 756                                         die(_("remote-curl: bad line length character: %.4s"), state->len_buf);
 757                                 } else if (state->remaining == 2) {
 758                                         die(_("remote-curl: unexpected response end packet"));
 759                                 } else if (state->remaining < 4) {
 760                                         state->remaining = 0;
 761                                 } else {
 762                                         state->remaining -= 4;
 763                                 }
 764                                 state->len_filled = 0;
 765                         }
 766                 }
 767
 768                 if (state->remaining) {
 769                         int remaining = state->remaining;
 770                         if (remaining > size)
 771                                 remaining = size;
 772                         ptr += remaining;
 773                         size -= remaining;
 774                         state->remaining -= remaining;
 775                 }
 776         }
 777 }
 778
 779 struct rpc_in_data {
 780         struct rpc_state *rpc;
 781         struct active_request_slot *slot;
 782         int check_pktline;
 783         struct check_pktline_state pktline_state;
 784 };
 785
 786 /*
 787  * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
 788  * from ptr.
 789  */
 790 static size_t rpc_in(char *ptr, size_t eltsize,
 791                 size_t nmemb, void *buffer_)
 792 {
 793         size_t size = eltsize * nmemb;
 794         struct rpc_in_data *data = buffer_;
 795         long response_code;
 796
 797         if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
 798                               &response_code) != CURLE_OK)
 799                 return size;
 800         if (response_code >= 300)
 801                 return size;
 802         if (size)
 803                 data->rpc->any_written = 1;
 804         if (data->check_pktline)
 805                 check_pktline(&data->pktline_state, ptr, size);
 806         write_or_die(data->rpc->in, ptr, size);
 807         return size;
 808 }
 809
 810 static int run_slot(struct active_request_slot *slot,
 811                     struct slot_results *results)
 812 {
 813         int err;
 814         struct slot_results results_buf;
 815
 816         if (!results)
 817                 results = &results_buf;
 818
 819         err = run_one_slot(slot, results);
 820
 821         if (err != HTTP_OK && err != HTTP_REAUTH) {
 822                 struct strbuf msg = STRBUF_INIT;
 823                 if (results->http_code && results->http_code != 200)
 824                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 825                 if (results->curl_result != CURLE_OK) {
 826                         if (msg.len)
 827                                 strbuf_addch(&msg, ' ');
 828                         strbuf_addf(&msg, "curl %d", results->curl_result);
 829                         if (curl_errorstr[0]) {
 830                                 strbuf_addch(&msg, ' ');
 831                                 strbuf_addstr(&msg, curl_errorstr);
 832                         }
 833                 }
 834                 error(_("RPC failed; %s"), msg.buf);
 835                 strbuf_release(&msg);
 836         }
 837
 838         return err;
 839 }
 840
 841 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 842 {
 843         struct active_request_slot *slot;
 844         struct curl_slist *headers = http_copy_default_headers();
 845         struct strbuf buf = STRBUF_INIT;
 846         int err;
 847
 848         slot = get_active_slot();
 849
 850         headers = curl_slist_append(headers, rpc->hdr_content_type);
 851         headers = curl_slist_append(headers, rpc->hdr_accept);
 852
 853         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 854         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 855         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 856         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 857         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 858         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 859         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 860         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 861         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 862
 863         err = run_slot(slot, results);
 864
 865         curl_slist_free_all(headers);
 866         strbuf_release(&buf);
 867         return err;
 868 }
 869
 870 static curl_off_t xcurl_off_t(size_t len)
 871 {
 872         uintmax_t size = len;
 873         if (size > maximum_signed_value_of_type(curl_off_t))
 874                 die(_("cannot handle pushes this big"));
 875         return (curl_off_t)size;
 876 }
 877
 878 /*
 879  * If flush_received is true, do not attempt to read any more; just use what's
 880  * in rpc->buf.
 881  */
 882 static int post_rpc(struct rpc_state *rpc, int stateless_connect, int flush_received)
 883 {
 884         struct active_request_slot *slot;
 885         struct curl_slist *headers = http_copy_default_headers();
 886         int use_gzip = rpc->gzip_request;
 887         char *gzip_body = NULL;
 888         size_t gzip_size = 0;
 889         int err, large_request = 0;
 890         int needs_100_continue = 0;
 891         struct rpc_in_data rpc_in_data;
 892
 893         /* Try to load the entire request, if we can fit it into the
 894          * allocated buffer space we can use HTTP/1.0 and avoid the
 895          * chunked encoding mess.
 896          */
 897         if (!flush_received) {
 898                 while (1) {
 899                         size_t n;
 900                         enum packet_read_status status;
 901
 902                         if (!rpc_read_from_out(rpc, 0, &n, &status)) {
 903                                 large_request = 1;
 904                                 use_gzip = 0;
 905                                 break;
 906                         }
 907                         if (status == PACKET_READ_FLUSH)
 908                                 break;
 909                 }
 910         }
 911
 912         if (large_request) {
 913                 struct slot_results results;
 914
 915                 do {
 916                         err = probe_rpc(rpc, &results);
 917                         if (err == HTTP_REAUTH)
 918                                 credential_fill(&http_auth);
 919                 } while (err == HTTP_REAUTH);
 920                 if (err != HTTP_OK)
 921                         return -1;
 922
 923                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 924                         needs_100_continue = 1;
 925         }
 926
 927         headers = curl_slist_append(headers, rpc->hdr_content_type);
 928         headers = curl_slist_append(headers, rpc->hdr_accept);
 929         headers = curl_slist_append(headers, needs_100_continue ?
 930                 "Expect: 100-continue" : "Expect:");
 931
 932         /* Add the extra Git-Protocol header */
 933         if (rpc->protocol_header)
 934                 headers = curl_slist_append(headers, rpc->protocol_header);
 935
 936 retry:
 937         slot = get_active_slot();
 938
 939         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 940         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 941         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 942         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 943
 944         if (large_request) {
 945                 /* The request body is large and the size cannot be predicted.
 946                  * We must use chunked encoding to send it.
 947                  */
 948                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 949                 rpc->initial_buffer = 1;
 950                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 951                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 952 #ifndef NO_CURL_IOCTL
 953                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 954                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 955 #endif
 956                 if (options.verbosity > 1) {
 957                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 958                         fflush(stderr);
 959                 }
 960
 961         } else if (gzip_body) {
 962                 /*
 963                  * If we are looping to retry authentication, then the previous
 964                  * run will have set up the headers and gzip buffer already,
 965                  * and we just need to send it.
 966                  */
 967                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 968                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 969
 970         } else if (use_gzip && 1024 < rpc->len) {
 971                 /* The client backend isn't giving us compressed data so
 972                  * we can try to deflate it ourselves, this may save on
 973                  * the transfer time.
 974                  */
 975                 git_zstream stream;
 976                 int ret;
 977
 978                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 979                 gzip_size = git_deflate_bound(&stream, rpc->len);
 980                 gzip_body = xmalloc(gzip_size);
 981
 982                 stream.next_in = (unsigned char *)rpc->buf;
 983                 stream.avail_in = rpc->len;
 984                 stream.next_out = (unsigned char *)gzip_body;
 985                 stream.avail_out = gzip_size;
 986
 987                 ret = git_deflate(&stream, Z_FINISH);
 988                 if (ret != Z_STREAM_END)
 989                         die(_("cannot deflate request; zlib deflate error %d"), ret);
 990
 991                 ret = git_deflate_end_gently(&stream);
 992                 if (ret != Z_OK)
 993                         die(_("cannot deflate request; zlib end error %d"), ret);
 994
 995                 gzip_size = stream.total_out;
 996
 997                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 998                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 999                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
1000
1001                 if (options.verbosity > 1) {
1002                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
1003                                 rpc->service_name,
1004                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
1005                         fflush(stderr);
1006                 }
1007         } else {
1008                 /* We know the complete request size in advance, use the
1009                  * more normal Content-Length approach.
1010                  */
1011                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
1012                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
1013                 if (options.verbosity > 1) {
1014                         fprintf(stderr, "POST %s (%lu bytes)\n",
1015                                 rpc->service_name, (unsigned long)rpc->len);
1016                         fflush(stderr);
1017                 }
1018         }
1019
1020         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1021         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
1022         rpc_in_data.rpc = rpc;
1023         rpc_in_data.slot = slot;
1024         rpc_in_data.check_pktline = stateless_connect;
1025         memset(&rpc_in_data.pktline_state, 0, sizeof(rpc_in_data.pktline_state));
1026         curl_easy_setopt(slot->curl, CURLOPT_FILE, &rpc_in_data);
1027         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1028
1029
1030         rpc->any_written = 0;
1031         err = run_slot(slot, NULL);
1032         if (err == HTTP_REAUTH && !large_request) {
1033                 credential_fill(&http_auth);
1034                 goto retry;
1035         }
1036         if (err != HTTP_OK)
1037                 err = -1;
1038
1039         if (!rpc->any_written)
1040                 err = -1;
1041
1042         if (rpc_in_data.pktline_state.len_filled)
1043                 err = error(_("%d bytes of length header were received"), rpc_in_data.pktline_state.len_filled);
1044         if (rpc_in_data.pktline_state.remaining)
1045                 err = error(_("%d bytes of body are still expected"), rpc_in_data.pktline_state.remaining);
1046
1047         if (stateless_connect)
1048                 packet_response_end(rpc->in);
1049
1050         curl_slist_free_all(headers);
1051         free(gzip_body);
1052         return err;
1053 }
1054
1055 static int rpc_service(struct rpc_state *rpc, struct discovery *heads,
1056                        const char **client_argv, const struct strbuf *preamble,
1057                        struct strbuf *rpc_result)
1058 {
1059         const char *svc = rpc->service_name;
1060         struct strbuf buf = STRBUF_INIT;
1061         struct child_process client = CHILD_PROCESS_INIT;
1062         int err = 0;
1063
1064         client.in = -1;
1065         client.out = -1;
1066         client.git_cmd = 1;
1067         client.argv = client_argv;
1068         if (start_command(&client))
1069                 exit(1);
1070         write_or_die(client.in, preamble->buf, preamble->len);
1071         if (heads)
1072                 write_or_die(client.in, heads->buf, heads->len);
1073
1074         rpc->alloc = http_post_buffer;
1075         rpc->buf = xmalloc(rpc->alloc);
1076         rpc->in = client.in;
1077         rpc->out = client.out;
1078
1079         strbuf_addf(&buf, "%s%s", url.buf, svc);
1080         rpc->service_url = strbuf_detach(&buf, NULL);
1081
1082         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
1083         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
1084
1085         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
1086         rpc->hdr_accept = strbuf_detach(&buf, NULL);
1087
1088         if (get_protocol_http_header(heads->version, &buf))
1089                 rpc->protocol_header = strbuf_detach(&buf, NULL);
1090         else
1091                 rpc->protocol_header = NULL;
1092
1093         while (!err) {
1094                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
1095                 if (!n)
1096                         break;
1097                 rpc->pos = 0;
1098                 rpc->len = n;
1099                 err |= post_rpc(rpc, 0, 0);
1100         }
1101
1102         close(client.in);
1103         client.in = -1;
1104         if (!err) {
1105                 strbuf_read(rpc_result, client.out, 0);
1106         } else {
1107                 char buf[4096];
1108                 for (;;)
1109                         if (xread(client.out, buf, sizeof(buf)) <= 0)
1110                                 break;
1111         }
1112
1113         close(client.out);
1114         client.out = -1;
1115
1116         err |= finish_command(&client);
1117         free(rpc->service_url);
1118         free(rpc->hdr_content_type);
1119         free(rpc->hdr_accept);
1120         free(rpc->protocol_header);
1121         free(rpc->buf);
1122         strbuf_release(&buf);
1123         return err;
1124 }
1125
1126 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
1127 {
1128         struct walker *walker;
1129         char **targets;
1130         int ret, i;
1131
1132         ALLOC_ARRAY(targets, nr_heads);
1133         if (options.depth || options.deepen_since)
1134                 die(_("dumb http transport does not support shallow capabilities"));
1135         for (i = 0; i < nr_heads; i++)
1136                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
1137
1138         walker = get_http_walker(url.buf);
1139         walker->get_verbosely = options.verbosity >= 3;
1140         walker->get_progress = options.progress;
1141         walker->get_recover = 0;
1142         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
1143         walker_free(walker);
1144
1145         for (i = 0; i < nr_heads; i++)
1146                 free(targets[i]);
1147         free(targets);
1148
1149         return ret ? error(_("fetch failed.")) : 0;
1150 }
1151
1152 static int fetch_git(struct discovery *heads,
1153         int nr_heads, struct ref **to_fetch)
1154 {
1155         struct rpc_state rpc;
1156         struct strbuf preamble = STRBUF_INIT;
1157         int i, err;
1158         struct strvec args = STRVEC_INIT;
1159         struct strbuf rpc_result = STRBUF_INIT;
1160
1161         strvec_pushl(&args, "fetch-pack", "--stateless-rpc",
1162                      "--stdin", "--lock-pack", NULL);
1163         if (options.followtags)
1164                 strvec_push(&args, "--include-tag");
1165         if (options.thin)
1166                 strvec_push(&args, "--thin");
1167         if (options.verbosity >= 3)
1168                 strvec_pushl(&args, "-v", "-v", NULL);
1169         if (options.check_self_contained_and_connected)
1170                 strvec_push(&args, "--check-self-contained-and-connected");
1171         if (options.cloning)
1172                 strvec_push(&args, "--cloning");
1173         if (options.update_shallow)
1174                 strvec_push(&args, "--update-shallow");
1175         if (!options.progress)
1176                 strvec_push(&args, "--no-progress");
1177         if (options.depth)
1178                 strvec_pushf(&args, "--depth=%lu", options.depth);
1179         if (options.deepen_since)
1180                 strvec_pushf(&args, "--shallow-since=%s", options.deepen_since);
1181         for (i = 0; i < options.deepen_not.nr; i++)
1182                 strvec_pushf(&args, "--shallow-exclude=%s",
1183                              options.deepen_not.items[i].string);
1184         if (options.deepen_relative && options.depth)
1185                 strvec_push(&args, "--deepen-relative");
1186         if (options.from_promisor)
1187                 strvec_push(&args, "--from-promisor");
1188         if (options.filter)
1189                 strvec_pushf(&args, "--filter=%s", options.filter);
1190         strvec_push(&args, url.buf);
1191
1192         for (i = 0; i < nr_heads; i++) {
1193                 struct ref *ref = to_fetch[i];
1194                 if (!*ref->name)
1195                         die(_("cannot fetch by sha1 over smart http"));
1196                 packet_buf_write(&preamble, "%s %s\n",
1197                                  oid_to_hex(&ref->old_oid), ref->name);
1198         }
1199         packet_buf_flush(&preamble);
1200
1201         memset(&rpc, 0, sizeof(rpc));
1202         rpc.service_name = "git-upload-pack",
1203         rpc.gzip_request = 1;
1204
1205         err = rpc_service(&rpc, heads, args.v, &preamble, &rpc_result);
1206         if (rpc_result.len)
1207                 write_or_die(1, rpc_result.buf, rpc_result.len);
1208         strbuf_release(&rpc_result);
1209         strbuf_release(&preamble);
1210         strvec_clear(&args);
1211         return err;
1212 }
1213
1214 static int fetch(int nr_heads, struct ref **to_fetch)
1215 {
1216         struct discovery *d = discover_refs("git-upload-pack", 0);
1217         if (d->proto_git)
1218                 return fetch_git(d, nr_heads, to_fetch);
1219         else
1220                 return fetch_dumb(nr_heads, to_fetch);
1221 }
1222
1223 static void parse_fetch(struct strbuf *buf)
1224 {
1225         struct ref **to_fetch = NULL;
1226         struct ref *list_head = NULL;
1227         struct ref **list = &list_head;
1228         int alloc_heads = 0, nr_heads = 0;
1229
1230         do {
1231                 const char *p;
1232                 if (skip_prefix(buf->buf, "fetch ", &p)) {
1233                         const char *name;
1234                         struct ref *ref;
1235                         struct object_id old_oid;
1236                         const char *q;
1237
1238                         if (parse_oid_hex(p, &old_oid, &q))
1239                                 die(_("protocol error: expected sha/ref, got '%s'"), p);
1240                         if (*q == ' ')
1241                                 name = q + 1;
1242                         else if (!*q)
1243                                 name = "";
1244                         else
1245                                 die(_("protocol error: expected sha/ref, got '%s'"), p);
1246
1247                         ref = alloc_ref(name);
1248                         oidcpy(&ref->old_oid, &old_oid);
1249
1250                         *list = ref;
1251                         list = &ref->next;
1252
1253                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1254                         to_fetch[nr_heads++] = ref;
1255                 }
1256                 else
1257                         die(_("http transport does not support %s"), buf->buf);
1258
1259                 strbuf_reset(buf);
1260                 if (strbuf_getline_lf(buf, stdin) == EOF)
1261                         return;
1262                 if (!*buf->buf)
1263                         break;
1264         } while (1);
1265
1266         if (fetch(nr_heads, to_fetch))
1267                 exit(128); /* error already reported */
1268         free_refs(list_head);
1269         free(to_fetch);
1270
1271         printf("\n");
1272         fflush(stdout);
1273         strbuf_reset(buf);
1274 }
1275
1276 static int push_dav(int nr_spec, const char **specs)
1277 {
1278         struct child_process child = CHILD_PROCESS_INIT;
1279         size_t i;
1280
1281         child.git_cmd = 1;
1282         strvec_push(&child.args, "http-push");
1283         strvec_push(&child.args, "--helper-status");
1284         if (options.dry_run)
1285                 strvec_push(&child.args, "--dry-run");
1286         if (options.verbosity > 1)
1287                 strvec_push(&child.args, "--verbose");
1288         strvec_push(&child.args, url.buf);
1289         for (i = 0; i < nr_spec; i++)
1290                 strvec_push(&child.args, specs[i]);
1291
1292         if (run_command(&child))
1293                 die(_("git-http-push failed"));
1294         return 0;
1295 }
1296
1297 static int push_git(struct discovery *heads, int nr_spec, const char **specs)
1298 {
1299         struct rpc_state rpc;
1300         int i, err;
1301         struct strvec args;
1302         struct string_list_item *cas_option;
1303         struct strbuf preamble = STRBUF_INIT;
1304         struct strbuf rpc_result = STRBUF_INIT;
1305
1306         strvec_init(&args);
1307         strvec_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1308                      NULL);
1309
1310         if (options.thin)
1311                 strvec_push(&args, "--thin");
1312         if (options.dry_run)
1313                 strvec_push(&args, "--dry-run");
1314         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1315                 strvec_push(&args, "--signed=yes");
1316         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1317                 strvec_push(&args, "--signed=if-asked");
1318         if (options.atomic)
1319                 strvec_push(&args, "--atomic");
1320         if (options.verbosity == 0)
1321                 strvec_push(&args, "--quiet");
1322         else if (options.verbosity > 1)
1323                 strvec_push(&args, "--verbose");
1324         for (i = 0; i < options.push_options.nr; i++)
1325                 strvec_pushf(&args, "--push-option=%s",
1326                              options.push_options.items[i].string);
1327         strvec_push(&args, options.progress ? "--progress" : "--no-progress");
1328         for_each_string_list_item(cas_option, &cas_options)
1329                 strvec_push(&args, cas_option->string);
1330         strvec_push(&args, url.buf);
1331
1332         if (options.force_if_includes)
1333                 strvec_push(&args, "--force-if-includes");
1334
1335         strvec_push(&args, "--stdin");
1336         for (i = 0; i < nr_spec; i++)
1337                 packet_buf_write(&preamble, "%s\n", specs[i]);
1338         packet_buf_flush(&preamble);
1339
1340         memset(&rpc, 0, sizeof(rpc));
1341         rpc.service_name = "git-receive-pack",
1342
1343         err = rpc_service(&rpc, heads, args.v, &preamble, &rpc_result);
1344         if (rpc_result.len)
1345                 write_or_die(1, rpc_result.buf, rpc_result.len);
1346         strbuf_release(&rpc_result);
1347         strbuf_release(&preamble);
1348         strvec_clear(&args);
1349         return err;
1350 }
1351
1352 static int push(int nr_spec, const char **specs)
1353 {
1354         struct discovery *heads = discover_refs("git-receive-pack", 1);
1355         int ret;
1356
1357         if (heads->proto_git)
1358                 ret = push_git(heads, nr_spec, specs);
1359         else
1360                 ret = push_dav(nr_spec, specs);
1361         free_discovery(heads);
1362         return ret;
1363 }
1364
1365 static void parse_push(struct strbuf *buf)
1366 {
1367         struct strvec specs = STRVEC_INIT;
1368         int ret;
1369
1370         do {
1371                 const char *arg;
1372                 if (skip_prefix(buf->buf, "push ", &arg))
1373                         strvec_push(&specs, arg);
1374                 else
1375                         die(_("http transport does not support %s"), buf->buf);
1376
1377                 strbuf_reset(buf);
1378                 if (strbuf_getline_lf(buf, stdin) == EOF)
1379                         goto free_specs;
1380                 if (!*buf->buf)
1381                         break;
1382         } while (1);
1383
1384         ret = push(specs.nr, specs.v);
1385         printf("\n");
1386         fflush(stdout);
1387
1388         if (ret)
1389                 exit(128); /* error already reported */
1390
1391 free_specs:
1392         strvec_clear(&specs);
1393 }
1394
1395 static int stateless_connect(const char *service_name)
1396 {
1397         struct discovery *discover;
1398         struct rpc_state rpc;
1399         struct strbuf buf = STRBUF_INIT;
1400
1401         /*
1402          * Run the info/refs request and see if the server supports protocol
1403          * v2.  If and only if the server supports v2 can we successfully
1404          * establish a stateless connection, otherwise we need to tell the
1405          * client to fallback to using other transport helper functions to
1406          * complete their request.
1407          */
1408         discover = discover_refs(service_name, 0);
1409         if (discover->version != protocol_v2) {
1410                 printf("fallback\n");
1411                 fflush(stdout);
1412                 return -1;
1413         } else {
1414                 /* Stateless Connection established */
1415                 printf("\n");
1416                 fflush(stdout);
1417         }
1418
1419         rpc.service_name = service_name;
1420         rpc.service_url = xstrfmt("%s%s", url.buf, rpc.service_name);
1421         rpc.hdr_content_type = xstrfmt("Content-Type: application/x-%s-request", rpc.service_name);
1422         rpc.hdr_accept = xstrfmt("Accept: application/x-%s-result", rpc.service_name);
1423         if (get_protocol_http_header(discover->version, &buf)) {
1424                 rpc.protocol_header = strbuf_detach(&buf, NULL);
1425         } else {
1426                 rpc.protocol_header = NULL;
1427                 strbuf_release(&buf);
1428         }
1429         rpc.buf = xmalloc(http_post_buffer);
1430         rpc.alloc = http_post_buffer;
1431         rpc.len = 0;
1432         rpc.pos = 0;
1433         rpc.in = 1;
1434         rpc.out = 0;
1435         rpc.any_written = 0;
1436         rpc.gzip_request = 1;
1437         rpc.initial_buffer = 0;
1438         rpc.write_line_lengths = 1;
1439         rpc.flush_read_but_not_sent = 0;
1440
1441         /*
1442          * Dump the capability listing that we got from the server earlier
1443          * during the info/refs request.
1444          */
1445         write_or_die(rpc.in, discover->buf, discover->len);
1446
1447         /* Until we see EOF keep sending POSTs */
1448         while (1) {
1449                 size_t avail;
1450                 enum packet_read_status status;
1451
1452                 if (!rpc_read_from_out(&rpc, PACKET_READ_GENTLE_ON_EOF, &avail,
1453                                        &status))
1454                         BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
1455                 if (status == PACKET_READ_EOF)
1456                         break;
1457                 if (post_rpc(&rpc, 1, status == PACKET_READ_FLUSH))
1458                         /* We would have an err here */
1459                         break;
1460                 /* Reset the buffer for next request */
1461                 rpc.len = 0;
1462         }
1463
1464         free(rpc.service_url);
1465         free(rpc.hdr_content_type);
1466         free(rpc.hdr_accept);
1467         free(rpc.protocol_header);
1468         free(rpc.buf);
1469         strbuf_release(&buf);
1470
1471         return 0;
1472 }
1473
1474 int cmd_main(int argc, const char **argv)
1475 {
1476         struct strbuf buf = STRBUF_INIT;
1477         int nongit;
1478
1479         setup_git_directory_gently(&nongit);
1480         if (argc < 2) {
1481                 error(_("remote-curl: usage: git remote-curl <remote> [<url>]"));
1482                 return 1;
1483         }
1484
1485         options.verbosity = 1;
1486         options.progress = !!isatty(2);
1487         options.thin = 1;
1488         string_list_init(&options.deepen_not, 1);
1489         string_list_init(&options.push_options, 1);
1490
1491         /*
1492          * Just report "remote-curl" here (folding all the various aliases
1493          * ("git-remote-http", "git-remote-https", and etc.) here since they
1494          * are all just copies of the same actual executable.
1495          */
1496         trace2_cmd_name("remote-curl");
1497
1498         remote = remote_get(argv[1]);
1499
1500         if (argc > 2) {
1501                 end_url_with_slash(&url, argv[2]);
1502         } else {
1503                 end_url_with_slash(&url, remote->url[0]);
1504         }
1505
1506         http_init(remote, url.buf, 0);
1507
1508         do {
1509                 const char *arg;
1510
1511                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1512                         if (ferror(stdin))
1513                                 error(_("remote-curl: error reading command stream from git"));
1514                         return 1;
1515                 }
1516                 if (buf.len == 0)
1517                         break;
1518                 if (starts_with(buf.buf, "fetch ")) {
1519                         if (nongit)
1520                                 die(_("remote-curl: fetch attempted without a local repo"));
1521                         parse_fetch(&buf);
1522
1523                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1524                         int for_push = !!strstr(buf.buf + 4, "for-push");
1525                         output_refs(get_refs(for_push));
1526
1527                 } else if (starts_with(buf.buf, "push ")) {
1528                         parse_push(&buf);
1529
1530                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1531                         char *value = strchr(arg, ' ');
1532                         int result;
1533
1534                         if (value)
1535                                 *value++ = '\0';
1536                         else
1537                                 value = "true";
1538
1539                         result = set_option(arg, value);
1540                         if (!result)
1541                                 printf("ok\n");
1542                         else if (result < 0)
1543                                 printf("error invalid value\n");
1544                         else
1545                                 printf("unsupported\n");
1546                         fflush(stdout);
1547
1548                 } else if (!strcmp(buf.buf, "capabilities")) {
1549                         printf("stateless-connect\n");
1550                         printf("fetch\n");
1551                         printf("option\n");
1552                         printf("push\n");
1553                         printf("check-connectivity\n");
1554                         printf("object-format\n");
1555                         printf("\n");
1556                         fflush(stdout);
1557                 } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1558                         if (!stateless_connect(arg))
1559                                 break;
1560                 } else {
1561                         error(_("remote-curl: unknown command '%s' from git"), buf.buf);
1562                         return 1;
1563                 }
1564                 strbuf_reset(&buf);
1565         } while (1);
1566
1567         http_cleanup();
1568
1569         return 0;
1570 }