remote-curl.c

   1 #include "cache.h"
   2 #include "git-curl-compat.h"
   3 #include "config.h"
   4 #include "remote.h"
   5 #include "connect.h"
   6 #include "strbuf.h"
   7 #include "walker.h"
   8 #include "http.h"
   9 #include "exec-cmd.h"
  10 #include "run-command.h"
  11 #include "pkt-line.h"
  12 #include "string-list.h"
  13 #include "sideband.h"
  14 #include "strvec.h"
  15 #include "credential.h"
  16 #include "oid-array.h"
  17 #include "send-pack.h"
  18 #include "protocol.h"
  19 #include "quote.h"
  20 #include "transport.h"
  21
  22 static struct remote *remote;
  23 /* always ends with a trailing slash */
  24 static struct strbuf url = STRBUF_INIT;
  25
  26 struct options {
  27         int verbosity;
  28         unsigned long depth;
  29         char *deepen_since;
  30         struct string_list deepen_not;
  31         struct string_list push_options;
  32         char *filter;
  33         unsigned progress : 1,
  34                 check_self_contained_and_connected : 1,
  35                 cloning : 1,
  36                 update_shallow : 1,
  37                 followtags : 1,
  38                 dry_run : 1,
  39                 thin : 1,
  40                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
  41                 push_cert : 2,
  42                 deepen_relative : 1,
  43
  44                 /* see documentation of corresponding flag in fetch-pack.h */
  45                 from_promisor : 1,
  46
  47                 refetch : 1,
  48                 atomic : 1,
  49                 object_format : 1,
  50                 force_if_includes : 1;
  51         const struct git_hash_algo *hash_algo;
  52 };
  53 static struct options options;
  54 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  55
  56 static int set_option(const char *name, const char *value)
  57 {
  58         if (!strcmp(name, "verbosity")) {
  59                 char *end;
  60                 int v = strtol(value, &end, 10);
  61                 if (value == end || *end)
  62                         return -1;
  63                 options.verbosity = v;
  64                 return 0;
  65         }
  66         else if (!strcmp(name, "progress")) {
  67                 if (!strcmp(value, "true"))
  68                         options.progress = 1;
  69                 else if (!strcmp(value, "false"))
  70                         options.progress = 0;
  71                 else
  72                         return -1;
  73                 return 0;
  74         }
  75         else if (!strcmp(name, "depth")) {
  76                 char *end;
  77                 unsigned long v = strtoul(value, &end, 10);
  78                 if (value == end || *end)
  79                         return -1;
  80                 options.depth = v;
  81                 return 0;
  82         }
  83         else if (!strcmp(name, "deepen-since")) {
  84                 options.deepen_since = xstrdup(value);
  85                 return 0;
  86         }
  87         else if (!strcmp(name, "deepen-not")) {
  88                 string_list_append(&options.deepen_not, value);
  89                 return 0;
  90         }
  91         else if (!strcmp(name, "deepen-relative")) {
  92                 if (!strcmp(value, "true"))
  93                         options.deepen_relative = 1;
  94                 else if (!strcmp(value, "false"))
  95                         options.deepen_relative = 0;
  96                 else
  97                         return -1;
  98                 return 0;
  99         }
 100         else if (!strcmp(name, "followtags")) {
 101                 if (!strcmp(value, "true"))
 102                         options.followtags = 1;
 103                 else if (!strcmp(value, "false"))
 104                         options.followtags = 0;
 105                 else
 106                         return -1;
 107                 return 0;
 108         }
 109         else if (!strcmp(name, "dry-run")) {
 110                 if (!strcmp(value, "true"))
 111                         options.dry_run = 1;
 112                 else if (!strcmp(value, "false"))
 113                         options.dry_run = 0;
 114                 else
 115                         return -1;
 116                 return 0;
 117         }
 118         else if (!strcmp(name, "check-connectivity")) {
 119                 if (!strcmp(value, "true"))
 120                         options.check_self_contained_and_connected = 1;
 121                 else if (!strcmp(value, "false"))
 122                         options.check_self_contained_and_connected = 0;
 123                 else
 124                         return -1;
 125                 return 0;
 126         }
 127         else if (!strcmp(name, "cas")) {
 128                 struct strbuf val = STRBUF_INIT;
 129                 strbuf_addstr(&val, "--force-with-lease=");
 130                 if (*value != '"')
 131                         strbuf_addstr(&val, value);
 132                 else if (unquote_c_style(&val, value, NULL))
 133                         return -1;
 134                 string_list_append(&cas_options, val.buf);
 135                 strbuf_release(&val);
 136                 return 0;
 137         } else if (!strcmp(name, TRANS_OPT_FORCE_IF_INCLUDES)) {
 138                 if (!strcmp(value, "true"))
 139                         options.force_if_includes = 1;
 140                 else if (!strcmp(value, "false"))
 141                         options.force_if_includes = 0;
 142                 else
 143                         return -1;
 144                 return 0;
 145         } else if (!strcmp(name, "cloning")) {
 146                 if (!strcmp(value, "true"))
 147                         options.cloning = 1;
 148                 else if (!strcmp(value, "false"))
 149                         options.cloning = 0;
 150                 else
 151                         return -1;
 152                 return 0;
 153         } else if (!strcmp(name, "update-shallow")) {
 154                 if (!strcmp(value, "true"))
 155                         options.update_shallow = 1;
 156                 else if (!strcmp(value, "false"))
 157                         options.update_shallow = 0;
 158                 else
 159                         return -1;
 160                 return 0;
 161         } else if (!strcmp(name, "pushcert")) {
 162                 if (!strcmp(value, "true"))
 163                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 164                 else if (!strcmp(value, "false"))
 165                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 166                 else if (!strcmp(value, "if-asked"))
 167                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 168                 else
 169                         return -1;
 170                 return 0;
 171         } else if (!strcmp(name, "atomic")) {
 172                 if (!strcmp(value, "true"))
 173                         options.atomic = 1;
 174                 else if (!strcmp(value, "false"))
 175                         options.atomic = 0;
 176                 else
 177                         return -1;
 178                 return 0;
 179         } else if (!strcmp(name, "push-option")) {
 180                 if (*value != '"')
 181                         string_list_append(&options.push_options, value);
 182                 else {
 183                         struct strbuf unquoted = STRBUF_INIT;
 184                         if (unquote_c_style(&unquoted, value, NULL) < 0)
 185                                 die(_("invalid quoting in push-option value: '%s'"), value);
 186                         string_list_append_nodup(&options.push_options,
 187                                                  strbuf_detach(&unquoted, NULL));
 188                 }
 189                 return 0;
 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         } else if (!strcmp(name, "from-promisor")) {
 201                 options.from_promisor = 1;
 202                 return 0;
 203         } else if (!strcmp(name, "refetch")) {
 204                 options.refetch = 1;
 205                 return 0;
 206         } else if (!strcmp(name, "filter")) {
 207                 options.filter = xstrdup(value);
 208                 return 0;
 209         } else if (!strcmp(name, "object-format")) {
 210                 int algo;
 211                 options.object_format = 1;
 212                 if (strcmp(value, "true")) {
 213                         algo = hash_algo_by_name(value);
 214                         if (algo == GIT_HASH_UNKNOWN)
 215                                 die("unknown object format '%s'", value);
 216                         options.hash_algo = &hash_algos[algo];
 217                 }
 218                 return 0;
 219         } else {
 220                 return 1 /* unsupported */;
 221         }
 222 }
 223
 224 struct discovery {
 225         char *service;
 226         char *buf_alloc;
 227         char *buf;
 228         size_t len;
 229         struct ref *refs;
 230         struct oid_array shallow;
 231         enum protocol_version version;
 232         unsigned proto_git : 1;
 233 };
 234 static struct discovery *last_discovery;
 235
 236 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 237 {
 238         struct ref *list = NULL;
 239         struct packet_reader reader;
 240
 241         packet_reader_init(&reader, -1, heads->buf, heads->len,
 242                            PACKET_READ_CHOMP_NEWLINE |
 243                            PACKET_READ_GENTLE_ON_EOF |
 244                            PACKET_READ_DIE_ON_ERR_PACKET);
 245
 246         heads->version = discover_version(&reader);
 247         switch (heads->version) {
 248         case protocol_v2:
 249                 /*
 250                  * Do nothing.  This isn't a list of refs but rather a
 251                  * capability advertisement.  Client would have run
 252                  * 'stateless-connect' so we'll dump this capability listing
 253                  * and let them request the refs themselves.
 254                  */
 255                 break;
 256         case protocol_v1:
 257         case protocol_v0:
 258                 get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
 259                                  NULL, &heads->shallow);
 260                 options.hash_algo = reader.hash_algo;
 261                 break;
 262         case protocol_unknown_version:
 263                 BUG("unknown protocol version");
 264         }
 265
 266         return list;
 267 }
 268
 269 static const struct git_hash_algo *detect_hash_algo(struct discovery *heads)
 270 {
 271         const char *p = memchr(heads->buf, '\t', heads->len);
 272         int algo;
 273         if (!p)
 274                 return the_hash_algo;
 275
 276         algo = hash_algo_by_length((p - heads->buf) / 2);
 277         if (algo == GIT_HASH_UNKNOWN)
 278                 return NULL;
 279         return &hash_algos[algo];
 280 }
 281
 282 static struct ref *parse_info_refs(struct discovery *heads)
 283 {
 284         char *data, *start, *mid;
 285         char *ref_name;
 286         int i = 0;
 287
 288         struct ref *refs = NULL;
 289         struct ref *ref = NULL;
 290         struct ref *last_ref = NULL;
 291
 292         options.hash_algo = detect_hash_algo(heads);
 293         if (!options.hash_algo)
 294                 die("%sinfo/refs not valid: could not determine hash algorithm; "
 295                     "is this a git repository?",
 296                     transport_anonymize_url(url.buf));
 297
 298         data = heads->buf;
 299         start = NULL;
 300         mid = data;
 301         while (i < heads->len) {
 302                 if (!start) {
 303                         start = &data[i];
 304                 }
 305                 if (data[i] == '\t')
 306                         mid = &data[i];
 307                 if (data[i] == '\n') {
 308                         if (mid - start != options.hash_algo->hexsz)
 309                                 die(_("%sinfo/refs not valid: is this a git repository?"),
 310                                     transport_anonymize_url(url.buf));
 311                         data[i] = 0;
 312                         ref_name = mid + 1;
 313                         ref = alloc_ref(ref_name);
 314                         get_oid_hex_algop(start, &ref->old_oid, options.hash_algo);
 315                         if (!refs)
 316                                 refs = ref;
 317                         if (last_ref)
 318                                 last_ref->next = ref;
 319                         last_ref = ref;
 320                         start = NULL;
 321                 }
 322                 i++;
 323         }
 324
 325         ref = alloc_ref("HEAD");
 326         if (!http_fetch_ref(url.buf, ref) &&
 327             !resolve_remote_symref(ref, refs)) {
 328                 ref->next = refs;
 329                 refs = ref;
 330         } else {
 331                 free(ref);
 332         }
 333
 334         return refs;
 335 }
 336
 337 static void free_discovery(struct discovery *d)
 338 {
 339         if (d) {
 340                 if (d == last_discovery)
 341                         last_discovery = NULL;
 342                 free(d->shallow.oid);
 343                 free(d->buf_alloc);
 344                 free_refs(d->refs);
 345                 free(d->service);
 346                 free(d);
 347         }
 348 }
 349
 350 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 351                              struct strbuf *msg)
 352 {
 353         const char *p, *eol;
 354
 355         /*
 356          * We only show text/plain parts, as other types are likely
 357          * to be ugly to look at on the user's terminal.
 358          */
 359         if (strcmp(type->buf, "text/plain"))
 360                 return -1;
 361         if (charset->len)
 362                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 363
 364         strbuf_trim(msg);
 365         if (!msg->len)
 366                 return -1;
 367
 368         p = msg->buf;
 369         do {
 370                 eol = strchrnul(p, '\n');
 371                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 372                 p = eol + 1;
 373         } while(*eol);
 374         return 0;
 375 }
 376
 377 static int get_protocol_http_header(enum protocol_version version,
 378                                     struct strbuf *header)
 379 {
 380         if (version > 0) {
 381                 strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
 382                             version);
 383
 384                 return 1;
 385         }
 386
 387         return 0;
 388 }
 389
 390 static void check_smart_http(struct discovery *d, const char *service,
 391                              struct strbuf *type)
 392 {
 393         const char *p;
 394         struct packet_reader reader;
 395
 396         /*
 397          * If we don't see x-$service-advertisement, then it's not smart-http.
 398          * But once we do, we commit to it and assume any other protocol
 399          * violations are hard errors.
 400          */
 401         if (!skip_prefix(type->buf, "application/x-", &p) ||
 402             !skip_prefix(p, service, &p) ||
 403             strcmp(p, "-advertisement"))
 404                 return;
 405
 406         packet_reader_init(&reader, -1, d->buf, d->len,
 407                            PACKET_READ_CHOMP_NEWLINE |
 408                            PACKET_READ_DIE_ON_ERR_PACKET);
 409         if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
 410                 die(_("invalid server response; expected service, got flush packet"));
 411
 412         if (skip_prefix(reader.line, "# service=", &p) && !strcmp(p, service)) {
 413                 /*
 414                  * The header can include additional metadata lines, up
 415                  * until a packet flush marker.  Ignore these now, but
 416                  * in the future we might start to scan them.
 417                  */
 418                 for (;;) {
 419                         packet_reader_read(&reader);
 420                         if (reader.pktlen <= 0) {
 421                                 break;
 422                         }
 423                 }
 424
 425                 /*
 426                  * v0 smart http; callers expect us to soak up the
 427                  * service and header packets
 428                  */
 429                 d->buf = reader.src_buffer;
 430                 d->len = reader.src_len;
 431                 d->proto_git = 1;
 432
 433         } else if (!strcmp(reader.line, "version 2")) {
 434                 /*
 435                  * v2 smart http; do not consume version packet, which will
 436                  * be handled elsewhere.
 437                  */
 438                 d->proto_git = 1;
 439
 440         } else {
 441                 die(_("invalid server response; got '%s'"), reader.line);
 442         }
 443 }
 444
 445 static struct discovery *discover_refs(const char *service, int for_push)
 446 {
 447         struct strbuf type = STRBUF_INIT;
 448         struct strbuf charset = STRBUF_INIT;
 449         struct strbuf buffer = STRBUF_INIT;
 450         struct strbuf refs_url = STRBUF_INIT;
 451         struct strbuf effective_url = STRBUF_INIT;
 452         struct strbuf protocol_header = STRBUF_INIT;
 453         struct string_list extra_headers = STRING_LIST_INIT_DUP;
 454         struct discovery *last = last_discovery;
 455         int http_ret, maybe_smart = 0;
 456         struct http_get_options http_options;
 457         enum protocol_version version = get_protocol_version_config();
 458
 459         if (last && !strcmp(service, last->service))
 460                 return last;
 461         free_discovery(last);
 462
 463         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 464         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 465              git_env_bool("GIT_SMART_HTTP", 1)) {
 466                 maybe_smart = 1;
 467                 if (!strchr(url.buf, '?'))
 468                         strbuf_addch(&refs_url, '?');
 469                 else
 470                         strbuf_addch(&refs_url, '&');
 471                 strbuf_addf(&refs_url, "service=%s", service);
 472         }
 473
 474         /*
 475          * NEEDSWORK: If we are trying to use protocol v2 and we are planning
 476          * to perform a push, then fallback to v0 since the client doesn't know
 477          * how to push yet using v2.
 478          */
 479         if (version == protocol_v2 && !strcmp("git-receive-pack", service))
 480                 version = protocol_v0;
 481
 482         /* Add the extra Git-Protocol header */
 483         if (get_protocol_http_header(version, &protocol_header))
 484                 string_list_append(&extra_headers, protocol_header.buf);
 485
 486         memset(&http_options, 0, sizeof(http_options));
 487         http_options.content_type = &type;
 488         http_options.charset = &charset;
 489         http_options.effective_url = &effective_url;
 490         http_options.base_url = &url;
 491         http_options.extra_headers = &extra_headers;
 492         http_options.initial_request = 1;
 493         http_options.no_cache = 1;
 494
 495         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 496         switch (http_ret) {
 497         case HTTP_OK:
 498                 break;
 499         case HTTP_MISSING_TARGET:
 500                 show_http_message(&type, &charset, &buffer);
 501                 die(_("repository '%s' not found"),
 502                     transport_anonymize_url(url.buf));
 503         case HTTP_NOAUTH:
 504                 show_http_message(&type, &charset, &buffer);
 505                 die(_("Authentication failed for '%s'"),
 506                     transport_anonymize_url(url.buf));
 507         case HTTP_NOMATCHPUBLICKEY:
 508                 show_http_message(&type, &charset, &buffer);
 509                 die(_("unable to access '%s' with http.pinnedPubkey configuration: %s"),
 510                     transport_anonymize_url(url.buf), curl_errorstr);
 511         default:
 512                 show_http_message(&type, &charset, &buffer);
 513                 die(_("unable to access '%s': %s"),
 514                     transport_anonymize_url(url.buf), curl_errorstr);
 515         }
 516
 517         if (options.verbosity && !starts_with(refs_url.buf, url.buf)) {
 518                 char *u = transport_anonymize_url(url.buf);
 519                 warning(_("redirecting to %s"), u);
 520                 free(u);
 521         }
 522
 523         last= xcalloc(1, sizeof(*last_discovery));
 524         last->service = xstrdup(service);
 525         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 526         last->buf = last->buf_alloc;
 527
 528         if (maybe_smart)
 529                 check_smart_http(last, service, &type);
 530
 531         if (last->proto_git)
 532                 last->refs = parse_git_refs(last, for_push);
 533         else
 534                 last->refs = parse_info_refs(last);
 535
 536         strbuf_release(&refs_url);
 537         strbuf_release(&type);
 538         strbuf_release(&charset);
 539         strbuf_release(&effective_url);
 540         strbuf_release(&buffer);
 541         strbuf_release(&protocol_header);
 542         string_list_clear(&extra_headers, 0);
 543         last_discovery = last;
 544         return last;
 545 }
 546
 547 static struct ref *get_refs(int for_push)
 548 {
 549         struct discovery *heads;
 550
 551         if (for_push)
 552                 heads = discover_refs("git-receive-pack", for_push);
 553         else
 554                 heads = discover_refs("git-upload-pack", for_push);
 555
 556         return heads->refs;
 557 }
 558
 559 static void output_refs(struct ref *refs)
 560 {
 561         struct ref *posn;
 562         if (options.object_format && options.hash_algo) {
 563                 printf(":object-format %s\n", options.hash_algo->name);
 564                 repo_set_hash_algo(the_repository,
 565                                 hash_algo_by_ptr(options.hash_algo));
 566         }
 567         for (posn = refs; posn; posn = posn->next) {
 568                 if (posn->symref)
 569                         printf("@%s %s\n", posn->symref, posn->name);
 570                 else
 571                         printf("%s %s\n", hash_to_hex_algop(posn->old_oid.hash,
 572                                                             options.hash_algo),
 573                                           posn->name);
 574         }
 575         printf("\n");
 576         fflush(stdout);
 577 }
 578
 579 struct rpc_state {
 580         const char *service_name;
 581         char *service_url;
 582         char *hdr_content_type;
 583         char *hdr_accept;
 584         char *hdr_accept_language;
 585         char *protocol_header;
 586         char *buf;
 587         size_t alloc;
 588         size_t len;
 589         size_t pos;
 590         int in;
 591         int out;
 592         int any_written;
 593         unsigned gzip_request : 1;
 594         unsigned initial_buffer : 1;
 595
 596         /*
 597          * Whenever a pkt-line is read into buf, append the 4 characters
 598          * denoting its length before appending the payload.
 599          */
 600         unsigned write_line_lengths : 1;
 601
 602         /*
 603          * Used by rpc_out; initialize to 0. This is true if a flush has been
 604          * read, but the corresponding line length (if write_line_lengths is
 605          * true) and EOF have not been sent to libcurl. Since each flush marks
 606          * the end of a request, each flush must be completely sent before any
 607          * further reading occurs.
 608          */
 609         unsigned flush_read_but_not_sent : 1;
 610 };
 611
 612 #define RPC_STATE_INIT { 0 }
 613
 614 /*
 615  * Appends the result of reading from rpc->out to the string represented by
 616  * rpc->buf and rpc->len if there is enough space. Returns 1 if there was
 617  * enough space, 0 otherwise.
 618  *
 619  * If rpc->write_line_lengths is true, appends the line length as a 4-byte
 620  * hexadecimal string before appending the result described above.
 621  *
 622  * Writes the total number of bytes appended into appended.
 623  */
 624 static int rpc_read_from_out(struct rpc_state *rpc, int options,
 625                              size_t *appended,
 626                              enum packet_read_status *status) {
 627         size_t left;
 628         char *buf;
 629         int pktlen_raw;
 630
 631         if (rpc->write_line_lengths) {
 632                 left = rpc->alloc - rpc->len - 4;
 633                 buf = rpc->buf + rpc->len + 4;
 634         } else {
 635                 left = rpc->alloc - rpc->len;
 636                 buf = rpc->buf + rpc->len;
 637         }
 638
 639         if (left < LARGE_PACKET_MAX)
 640                 return 0;
 641
 642         *status = packet_read_with_status(rpc->out, NULL, NULL, buf,
 643                         left, &pktlen_raw, options);
 644         if (*status != PACKET_READ_EOF) {
 645                 *appended = pktlen_raw + (rpc->write_line_lengths ? 4 : 0);
 646                 rpc->len += *appended;
 647         }
 648
 649         if (rpc->write_line_lengths) {
 650                 switch (*status) {
 651                 case PACKET_READ_EOF:
 652                         if (!(options & PACKET_READ_GENTLE_ON_EOF))
 653                                 die(_("shouldn't have EOF when not gentle on EOF"));
 654                         break;
 655                 case PACKET_READ_NORMAL:
 656                         set_packet_header(buf - 4, *appended);
 657                         break;
 658                 case PACKET_READ_DELIM:
 659                         memcpy(buf - 4, "0001", 4);
 660                         break;
 661                 case PACKET_READ_FLUSH:
 662                         memcpy(buf - 4, "0000", 4);
 663                         break;
 664                 case PACKET_READ_RESPONSE_END:
 665                         die(_("remote server sent unexpected response end packet"));
 666                 }
 667         }
 668
 669         return 1;
 670 }
 671
 672 static size_t rpc_out(void *ptr, size_t eltsize,
 673                 size_t nmemb, void *buffer_)
 674 {
 675         size_t max = eltsize * nmemb;
 676         struct rpc_state *rpc = buffer_;
 677         size_t avail = rpc->len - rpc->pos;
 678         enum packet_read_status status;
 679
 680         if (!avail) {
 681                 rpc->initial_buffer = 0;
 682                 rpc->len = 0;
 683                 rpc->pos = 0;
 684                 if (!rpc->flush_read_but_not_sent) {
 685                         if (!rpc_read_from_out(rpc, 0, &avail, &status))
 686                                 BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
 687                         if (status == PACKET_READ_FLUSH)
 688                                 rpc->flush_read_but_not_sent = 1;
 689                 }
 690                 /*
 691                  * If flush_read_but_not_sent is true, we have already read one
 692                  * full request but have not fully sent it + EOF, which is why
 693                  * we need to refrain from reading.
 694                  */
 695         }
 696         if (rpc->flush_read_but_not_sent) {
 697                 if (!avail) {
 698                         /*
 699                          * The line length either does not need to be sent at
 700                          * all or has already been completely sent. Now we can
 701                          * return 0, indicating EOF, meaning that the flush has
 702                          * been fully sent.
 703                          */
 704                         rpc->flush_read_but_not_sent = 0;
 705                         return 0;
 706                 }
 707                 /*
 708                  * If avail is non-zero, the line length for the flush still
 709                  * hasn't been fully sent. Proceed with sending the line
 710                  * length.
 711                  */
 712         }
 713
 714         if (max < avail)
 715                 avail = max;
 716         memcpy(ptr, rpc->buf + rpc->pos, avail);
 717         rpc->pos += avail;
 718         return avail;
 719 }
 720
 721 static int rpc_seek(void *clientp, curl_off_t offset, int origin)
 722 {
 723         struct rpc_state *rpc = clientp;
 724
 725         if (origin != SEEK_SET)
 726                 BUG("rpc_seek only handles SEEK_SET, not %d", origin);
 727
 728         if (rpc->initial_buffer) {
 729                 if (offset < 0 || offset > rpc->len) {
 730                         error("curl seek would be outside of rpc buffer");
 731                         return CURL_SEEKFUNC_FAIL;
 732                 }
 733                 rpc->pos = offset;
 734                 return CURL_SEEKFUNC_OK;
 735         }
 736         error(_("unable to rewind rpc post data - try increasing http.postBuffer"));
 737         return CURL_SEEKFUNC_FAIL;
 738 }
 739
 740 struct check_pktline_state {
 741         char len_buf[4];
 742         int len_filled;
 743         int remaining;
 744 };
 745
 746 static void check_pktline(struct check_pktline_state *state, const char *ptr, size_t size)
 747 {
 748         while (size) {
 749                 if (!state->remaining) {
 750                         int digits_remaining = 4 - state->len_filled;
 751                         if (digits_remaining > size)
 752                                 digits_remaining = size;
 753                         memcpy(&state->len_buf[state->len_filled], ptr, digits_remaining);
 754                         state->len_filled += digits_remaining;
 755                         ptr += digits_remaining;
 756                         size -= digits_remaining;
 757
 758                         if (state->len_filled == 4) {
 759                                 state->remaining = packet_length(state->len_buf);
 760                                 if (state->remaining < 0) {
 761                                         die(_("remote-curl: bad line length character: %.4s"), state->len_buf);
 762                                 } else if (state->remaining == 2) {
 763                                         die(_("remote-curl: unexpected response end packet"));
 764                                 } else if (state->remaining < 4) {
 765                                         state->remaining = 0;
 766                                 } else {
 767                                         state->remaining -= 4;
 768                                 }
 769                                 state->len_filled = 0;
 770                         }
 771                 }
 772
 773                 if (state->remaining) {
 774                         int remaining = state->remaining;
 775                         if (remaining > size)
 776                                 remaining = size;
 777                         ptr += remaining;
 778                         size -= remaining;
 779                         state->remaining -= remaining;
 780                 }
 781         }
 782 }
 783
 784 struct rpc_in_data {
 785         struct rpc_state *rpc;
 786         struct active_request_slot *slot;
 787         int check_pktline;
 788         struct check_pktline_state pktline_state;
 789 };
 790
 791 /*
 792  * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
 793  * from ptr.
 794  */
 795 static size_t rpc_in(char *ptr, size_t eltsize,
 796                 size_t nmemb, void *buffer_)
 797 {
 798         size_t size = eltsize * nmemb;
 799         struct rpc_in_data *data = buffer_;
 800         long response_code;
 801
 802         if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
 803                               &response_code) != CURLE_OK)
 804                 return size;
 805         if (response_code >= 300)
 806                 return size;
 807         if (size)
 808                 data->rpc->any_written = 1;
 809         if (data->check_pktline)
 810                 check_pktline(&data->pktline_state, ptr, size);
 811         write_or_die(data->rpc->in, ptr, size);
 812         return size;
 813 }
 814
 815 static int run_slot(struct active_request_slot *slot,
 816                     struct slot_results *results)
 817 {
 818         int err;
 819         struct slot_results results_buf;
 820
 821         if (!results)
 822                 results = &results_buf;
 823
 824         err = run_one_slot(slot, results);
 825
 826         if (err != HTTP_OK && err != HTTP_REAUTH) {
 827                 struct strbuf msg = STRBUF_INIT;
 828                 if (results->http_code && results->http_code != 200)
 829                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 830                 if (results->curl_result != CURLE_OK) {
 831                         if (msg.len)
 832                                 strbuf_addch(&msg, ' ');
 833                         strbuf_addf(&msg, "curl %d", results->curl_result);
 834                         if (curl_errorstr[0]) {
 835                                 strbuf_addch(&msg, ' ');
 836                                 strbuf_addstr(&msg, curl_errorstr);
 837                         }
 838                 }
 839                 error(_("RPC failed; %s"), msg.buf);
 840                 strbuf_release(&msg);
 841         }
 842
 843         return err;
 844 }
 845
 846 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 847 {
 848         struct active_request_slot *slot;
 849         struct curl_slist *headers = http_copy_default_headers();
 850         struct strbuf buf = STRBUF_INIT;
 851         int err;
 852
 853         slot = get_active_slot();
 854
 855         headers = curl_slist_append(headers, rpc->hdr_content_type);
 856         headers = curl_slist_append(headers, rpc->hdr_accept);
 857
 858         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 859         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 860         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 861         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 862         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 863         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 864         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 865         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 866         curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, &buf);
 867
 868         err = run_slot(slot, results);
 869
 870         curl_slist_free_all(headers);
 871         strbuf_release(&buf);
 872         return err;
 873 }
 874
 875 static curl_off_t xcurl_off_t(size_t len)
 876 {
 877         uintmax_t size = len;
 878         if (size > maximum_signed_value_of_type(curl_off_t))
 879                 die(_("cannot handle pushes this big"));
 880         return (curl_off_t)size;
 881 }
 882
 883 /*
 884  * If flush_received is true, do not attempt to read any more; just use what's
 885  * in rpc->buf.
 886  */
 887 static int post_rpc(struct rpc_state *rpc, int stateless_connect, int flush_received)
 888 {
 889         struct active_request_slot *slot;
 890         struct curl_slist *headers = http_copy_default_headers();
 891         int use_gzip = rpc->gzip_request;
 892         char *gzip_body = NULL;
 893         size_t gzip_size = 0;
 894         int err, large_request = 0;
 895         int needs_100_continue = 0;
 896         struct rpc_in_data rpc_in_data;
 897
 898         /* Try to load the entire request, if we can fit it into the
 899          * allocated buffer space we can use HTTP/1.0 and avoid the
 900          * chunked encoding mess.
 901          */
 902         if (!flush_received) {
 903                 while (1) {
 904                         size_t n;
 905                         enum packet_read_status status;
 906
 907                         if (!rpc_read_from_out(rpc, 0, &n, &status)) {
 908                                 large_request = 1;
 909                                 use_gzip = 0;
 910                                 break;
 911                         }
 912                         if (status == PACKET_READ_FLUSH)
 913                                 break;
 914                 }
 915         }
 916
 917         if (large_request) {
 918                 struct slot_results results;
 919
 920                 do {
 921                         err = probe_rpc(rpc, &results);
 922                         if (err == HTTP_REAUTH)
 923                                 credential_fill(&http_auth);
 924                 } while (err == HTTP_REAUTH);
 925                 if (err != HTTP_OK)
 926                         return -1;
 927
 928                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 929                         needs_100_continue = 1;
 930         }
 931
 932         headers = curl_slist_append(headers, rpc->hdr_content_type);
 933         headers = curl_slist_append(headers, rpc->hdr_accept);
 934         headers = curl_slist_append(headers, needs_100_continue ?
 935                 "Expect: 100-continue" : "Expect:");
 936
 937         /* Add Accept-Language header */
 938         if (rpc->hdr_accept_language)
 939                 headers = curl_slist_append(headers, rpc->hdr_accept_language);
 940
 941         /* Add the extra Git-Protocol header */
 942         if (rpc->protocol_header)
 943                 headers = curl_slist_append(headers, rpc->protocol_header);
 944
 945 retry:
 946         slot = get_active_slot();
 947
 948         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 949         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 950         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 951         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 952
 953         if (large_request) {
 954                 /* The request body is large and the size cannot be predicted.
 955                  * We must use chunked encoding to send it.
 956                  */
 957 #ifdef GIT_CURL_NEED_TRANSFER_ENCODING_HEADER
 958                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 959 #endif
 960                 rpc->initial_buffer = 1;
 961                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 962                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 963                 curl_easy_setopt(slot->curl, CURLOPT_SEEKFUNCTION, rpc_seek);
 964                 curl_easy_setopt(slot->curl, CURLOPT_SEEKDATA, rpc);
 965                 if (options.verbosity > 1) {
 966                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 967                         fflush(stderr);
 968                 }
 969
 970         } else if (gzip_body) {
 971                 /*
 972                  * If we are looping to retry authentication, then the previous
 973                  * run will have set up the headers and gzip buffer already,
 974                  * and we just need to send it.
 975                  */
 976                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 977                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 978
 979         } else if (use_gzip && 1024 < rpc->len) {
 980                 /* The client backend isn't giving us compressed data so
 981                  * we can try to deflate it ourselves, this may save on
 982                  * the transfer time.
 983                  */
 984                 git_zstream stream;
 985                 int ret;
 986
 987                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 988                 gzip_size = git_deflate_bound(&stream, rpc->len);
 989                 gzip_body = xmalloc(gzip_size);
 990
 991                 stream.next_in = (unsigned char *)rpc->buf;
 992                 stream.avail_in = rpc->len;
 993                 stream.next_out = (unsigned char *)gzip_body;
 994                 stream.avail_out = gzip_size;
 995
 996                 ret = git_deflate(&stream, Z_FINISH);
 997                 if (ret != Z_STREAM_END)
 998                         die(_("cannot deflate request; zlib deflate error %d"), ret);
 999
1000                 ret = git_deflate_end_gently(&stream);
1001                 if (ret != Z_OK)
1002                         die(_("cannot deflate request; zlib end error %d"), ret);
1003
1004                 gzip_size = stream.total_out;
1005
1006                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
1007                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
1008                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
1009
1010                 if (options.verbosity > 1) {
1011                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
1012                                 rpc->service_name,
1013                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
1014                         fflush(stderr);
1015                 }
1016         } else {
1017                 /* We know the complete request size in advance, use the
1018                  * more normal Content-Length approach.
1019                  */
1020                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
1021                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
1022                 if (options.verbosity > 1) {
1023                         fprintf(stderr, "POST %s (%lu bytes)\n",
1024                                 rpc->service_name, (unsigned long)rpc->len);
1025                         fflush(stderr);
1026                 }
1027         }
1028
1029         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1030         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
1031         rpc_in_data.rpc = rpc;
1032         rpc_in_data.slot = slot;
1033         rpc_in_data.check_pktline = stateless_connect;
1034         memset(&rpc_in_data.pktline_state, 0, sizeof(rpc_in_data.pktline_state));
1035         curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, &rpc_in_data);
1036         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1037
1038
1039         rpc->any_written = 0;
1040         err = run_slot(slot, NULL);
1041         if (err == HTTP_REAUTH && !large_request) {
1042                 credential_fill(&http_auth);
1043                 goto retry;
1044         }
1045         if (err != HTTP_OK)
1046                 err = -1;
1047
1048         if (!rpc->any_written)
1049                 err = -1;
1050
1051         if (rpc_in_data.pktline_state.len_filled)
1052                 err = error(_("%d bytes of length header were received"), rpc_in_data.pktline_state.len_filled);
1053         if (rpc_in_data.pktline_state.remaining)
1054                 err = error(_("%d bytes of body are still expected"), rpc_in_data.pktline_state.remaining);
1055
1056         if (stateless_connect)
1057                 packet_response_end(rpc->in);
1058
1059         curl_slist_free_all(headers);
1060         free(gzip_body);
1061         return err;
1062 }
1063
1064 static int rpc_service(struct rpc_state *rpc, struct discovery *heads,
1065                        const char **client_argv, const struct strbuf *preamble,
1066                        struct strbuf *rpc_result)
1067 {
1068         const char *svc = rpc->service_name;
1069         struct strbuf buf = STRBUF_INIT;
1070         struct child_process client = CHILD_PROCESS_INIT;
1071         int err = 0;
1072
1073         client.in = -1;
1074         client.out = -1;
1075         client.git_cmd = 1;
1076         strvec_pushv(&client.args, client_argv);
1077         if (start_command(&client))
1078                 exit(1);
1079         write_or_die(client.in, preamble->buf, preamble->len);
1080         if (heads)
1081                 write_or_die(client.in, heads->buf, heads->len);
1082
1083         rpc->alloc = http_post_buffer;
1084         rpc->buf = xmalloc(rpc->alloc);
1085         rpc->in = client.in;
1086         rpc->out = client.out;
1087
1088         strbuf_addf(&buf, "%s%s", url.buf, svc);
1089         rpc->service_url = strbuf_detach(&buf, NULL);
1090
1091         rpc->hdr_accept_language = xstrdup_or_null(http_get_accept_language_header());
1092
1093         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
1094         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
1095
1096         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
1097         rpc->hdr_accept = strbuf_detach(&buf, NULL);
1098
1099         if (get_protocol_http_header(heads->version, &buf))
1100                 rpc->protocol_header = strbuf_detach(&buf, NULL);
1101         else
1102                 rpc->protocol_header = NULL;
1103
1104         while (!err) {
1105                 int n = packet_read(rpc->out, rpc->buf, rpc->alloc, 0);
1106                 if (!n)
1107                         break;
1108                 rpc->pos = 0;
1109                 rpc->len = n;
1110                 err |= post_rpc(rpc, 0, 0);
1111         }
1112
1113         close(client.in);
1114         client.in = -1;
1115         if (!err) {
1116                 strbuf_read(rpc_result, client.out, 0);
1117         } else {
1118                 char buf[4096];
1119                 for (;;)
1120                         if (xread(client.out, buf, sizeof(buf)) <= 0)
1121                                 break;
1122         }
1123
1124         close(client.out);
1125         client.out = -1;
1126
1127         err |= finish_command(&client);
1128         free(rpc->service_url);
1129         free(rpc->hdr_content_type);
1130         free(rpc->hdr_accept);
1131         free(rpc->hdr_accept_language);
1132         free(rpc->protocol_header);
1133         free(rpc->buf);
1134         strbuf_release(&buf);
1135         return err;
1136 }
1137
1138 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
1139 {
1140         struct walker *walker;
1141         char **targets;
1142         int ret, i;
1143
1144         ALLOC_ARRAY(targets, nr_heads);
1145         if (options.depth || options.deepen_since)
1146                 die(_("dumb http transport does not support shallow capabilities"));
1147         for (i = 0; i < nr_heads; i++)
1148                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
1149
1150         walker = get_http_walker(url.buf);
1151         walker->get_verbosely = options.verbosity >= 3;
1152         walker->get_progress = options.progress;
1153         walker->get_recover = 0;
1154         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
1155         walker_free(walker);
1156
1157         for (i = 0; i < nr_heads; i++)
1158                 free(targets[i]);
1159         free(targets);
1160
1161         return ret ? error(_("fetch failed.")) : 0;
1162 }
1163
1164 static int fetch_git(struct discovery *heads,
1165         int nr_heads, struct ref **to_fetch)
1166 {
1167         struct rpc_state rpc = RPC_STATE_INIT;
1168         struct strbuf preamble = STRBUF_INIT;
1169         int i, err;
1170         struct strvec args = STRVEC_INIT;
1171         struct strbuf rpc_result = STRBUF_INIT;
1172
1173         strvec_pushl(&args, "fetch-pack", "--stateless-rpc",
1174                      "--stdin", "--lock-pack", NULL);
1175         if (options.followtags)
1176                 strvec_push(&args, "--include-tag");
1177         if (options.thin)
1178                 strvec_push(&args, "--thin");
1179         if (options.verbosity >= 3)
1180                 strvec_pushl(&args, "-v", "-v", NULL);
1181         if (options.check_self_contained_and_connected)
1182                 strvec_push(&args, "--check-self-contained-and-connected");
1183         if (options.cloning)
1184                 strvec_push(&args, "--cloning");
1185         if (options.update_shallow)
1186                 strvec_push(&args, "--update-shallow");
1187         if (!options.progress)
1188                 strvec_push(&args, "--no-progress");
1189         if (options.depth)
1190                 strvec_pushf(&args, "--depth=%lu", options.depth);
1191         if (options.deepen_since)
1192                 strvec_pushf(&args, "--shallow-since=%s", options.deepen_since);
1193         for (i = 0; i < options.deepen_not.nr; i++)
1194                 strvec_pushf(&args, "--shallow-exclude=%s",
1195                              options.deepen_not.items[i].string);
1196         if (options.deepen_relative && options.depth)
1197                 strvec_push(&args, "--deepen-relative");
1198         if (options.from_promisor)
1199                 strvec_push(&args, "--from-promisor");
1200         if (options.refetch)
1201                 strvec_push(&args, "--refetch");
1202         if (options.filter)
1203                 strvec_pushf(&args, "--filter=%s", options.filter);
1204         strvec_push(&args, url.buf);
1205
1206         for (i = 0; i < nr_heads; i++) {
1207                 struct ref *ref = to_fetch[i];
1208                 if (!*ref->name)
1209                         die(_("cannot fetch by sha1 over smart http"));
1210                 packet_buf_write(&preamble, "%s %s\n",
1211                                  oid_to_hex(&ref->old_oid), ref->name);
1212         }
1213         packet_buf_flush(&preamble);
1214
1215         memset(&rpc, 0, sizeof(rpc));
1216         rpc.service_name = "git-upload-pack",
1217         rpc.gzip_request = 1;
1218
1219         err = rpc_service(&rpc, heads, args.v, &preamble, &rpc_result);
1220         if (rpc_result.len)
1221                 write_or_die(1, rpc_result.buf, rpc_result.len);
1222         strbuf_release(&rpc_result);
1223         strbuf_release(&preamble);
1224         strvec_clear(&args);
1225         return err;
1226 }
1227
1228 static int fetch(int nr_heads, struct ref **to_fetch)
1229 {
1230         struct discovery *d = discover_refs("git-upload-pack", 0);
1231         if (d->proto_git)
1232                 return fetch_git(d, nr_heads, to_fetch);
1233         else
1234                 return fetch_dumb(nr_heads, to_fetch);
1235 }
1236
1237 static void parse_fetch(struct strbuf *buf)
1238 {
1239         struct ref **to_fetch = NULL;
1240         struct ref *list_head = NULL;
1241         struct ref **list = &list_head;
1242         int alloc_heads = 0, nr_heads = 0;
1243
1244         do {
1245                 const char *p;
1246                 if (skip_prefix(buf->buf, "fetch ", &p)) {
1247                         const char *name;
1248                         struct ref *ref;
1249                         struct object_id old_oid;
1250                         const char *q;
1251
1252                         if (parse_oid_hex(p, &old_oid, &q))
1253                                 die(_("protocol error: expected sha/ref, got '%s'"), p);
1254                         if (*q == ' ')
1255                                 name = q + 1;
1256                         else if (!*q)
1257                                 name = "";
1258                         else
1259                                 die(_("protocol error: expected sha/ref, got '%s'"), p);
1260
1261                         ref = alloc_ref(name);
1262                         oidcpy(&ref->old_oid, &old_oid);
1263
1264                         *list = ref;
1265                         list = &ref->next;
1266
1267                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1268                         to_fetch[nr_heads++] = ref;
1269                 }
1270                 else
1271                         die(_("http transport does not support %s"), buf->buf);
1272
1273                 strbuf_reset(buf);
1274                 if (strbuf_getline_lf(buf, stdin) == EOF)
1275                         return;
1276                 if (!*buf->buf)
1277                         break;
1278         } while (1);
1279
1280         if (fetch(nr_heads, to_fetch))
1281                 exit(128); /* error already reported */
1282         free_refs(list_head);
1283         free(to_fetch);
1284
1285         printf("\n");
1286         fflush(stdout);
1287         strbuf_reset(buf);
1288 }
1289
1290 static void parse_get(const char *arg)
1291 {
1292         struct strbuf url = STRBUF_INIT;
1293         struct strbuf path = STRBUF_INIT;
1294         const char *space;
1295
1296         space = strchr(arg, ' ');
1297
1298         if (!space)
1299                 die(_("protocol error: expected '<url> <path>', missing space"));
1300
1301         strbuf_add(&url, arg, space - arg);
1302         strbuf_addstr(&path, space + 1);
1303
1304         if (http_get_file(url.buf, path.buf, NULL))
1305                 die(_("failed to download file at URL '%s'"), url.buf);
1306
1307         strbuf_release(&url);
1308         strbuf_release(&path);
1309         printf("\n");
1310         fflush(stdout);
1311 }
1312
1313 static int push_dav(int nr_spec, const char **specs)
1314 {
1315         struct child_process child = CHILD_PROCESS_INIT;
1316         size_t i;
1317
1318         child.git_cmd = 1;
1319         strvec_push(&child.args, "http-push");
1320         strvec_push(&child.args, "--helper-status");
1321         if (options.dry_run)
1322                 strvec_push(&child.args, "--dry-run");
1323         if (options.verbosity > 1)
1324                 strvec_push(&child.args, "--verbose");
1325         strvec_push(&child.args, url.buf);
1326         for (i = 0; i < nr_spec; i++)
1327                 strvec_push(&child.args, specs[i]);
1328
1329         if (run_command(&child))
1330                 die(_("git-http-push failed"));
1331         return 0;
1332 }
1333
1334 static int push_git(struct discovery *heads, int nr_spec, const char **specs)
1335 {
1336         struct rpc_state rpc = RPC_STATE_INIT;
1337         int i, err;
1338         struct strvec args;
1339         struct string_list_item *cas_option;
1340         struct strbuf preamble = STRBUF_INIT;
1341         struct strbuf rpc_result = STRBUF_INIT;
1342
1343         strvec_init(&args);
1344         strvec_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1345                      NULL);
1346
1347         if (options.thin)
1348                 strvec_push(&args, "--thin");
1349         if (options.dry_run)
1350                 strvec_push(&args, "--dry-run");
1351         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1352                 strvec_push(&args, "--signed=yes");
1353         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1354                 strvec_push(&args, "--signed=if-asked");
1355         if (options.atomic)
1356                 strvec_push(&args, "--atomic");
1357         if (options.verbosity == 0)
1358                 strvec_push(&args, "--quiet");
1359         else if (options.verbosity > 1)
1360                 strvec_push(&args, "--verbose");
1361         for (i = 0; i < options.push_options.nr; i++)
1362                 strvec_pushf(&args, "--push-option=%s",
1363                              options.push_options.items[i].string);
1364         strvec_push(&args, options.progress ? "--progress" : "--no-progress");
1365         for_each_string_list_item(cas_option, &cas_options)
1366                 strvec_push(&args, cas_option->string);
1367         strvec_push(&args, url.buf);
1368
1369         if (options.force_if_includes)
1370                 strvec_push(&args, "--force-if-includes");
1371
1372         strvec_push(&args, "--stdin");
1373         for (i = 0; i < nr_spec; i++)
1374                 packet_buf_write(&preamble, "%s\n", specs[i]);
1375         packet_buf_flush(&preamble);
1376
1377         memset(&rpc, 0, sizeof(rpc));
1378         rpc.service_name = "git-receive-pack",
1379
1380         err = rpc_service(&rpc, heads, args.v, &preamble, &rpc_result);
1381         if (rpc_result.len)
1382                 write_or_die(1, rpc_result.buf, rpc_result.len);
1383         strbuf_release(&rpc_result);
1384         strbuf_release(&preamble);
1385         strvec_clear(&args);
1386         return err;
1387 }
1388
1389 static int push(int nr_spec, const char **specs)
1390 {
1391         struct discovery *heads = discover_refs("git-receive-pack", 1);
1392         int ret;
1393
1394         if (heads->proto_git)
1395                 ret = push_git(heads, nr_spec, specs);
1396         else
1397                 ret = push_dav(nr_spec, specs);
1398         free_discovery(heads);
1399         return ret;
1400 }
1401
1402 static void parse_push(struct strbuf *buf)
1403 {
1404         struct strvec specs = STRVEC_INIT;
1405         int ret;
1406
1407         do {
1408                 const char *arg;
1409                 if (skip_prefix(buf->buf, "push ", &arg))
1410                         strvec_push(&specs, arg);
1411                 else
1412                         die(_("http transport does not support %s"), buf->buf);
1413
1414                 strbuf_reset(buf);
1415                 if (strbuf_getline_lf(buf, stdin) == EOF)
1416                         goto free_specs;
1417                 if (!*buf->buf)
1418                         break;
1419         } while (1);
1420
1421         ret = push(specs.nr, specs.v);
1422         printf("\n");
1423         fflush(stdout);
1424
1425         if (ret)
1426                 exit(128); /* error already reported */
1427
1428 free_specs:
1429         strvec_clear(&specs);
1430 }
1431
1432 static int stateless_connect(const char *service_name)
1433 {
1434         struct discovery *discover;
1435         struct rpc_state rpc = RPC_STATE_INIT;
1436         struct strbuf buf = STRBUF_INIT;
1437         const char *accept_language;
1438
1439         /*
1440          * Run the info/refs request and see if the server supports protocol
1441          * v2.  If and only if the server supports v2 can we successfully
1442          * establish a stateless connection, otherwise we need to tell the
1443          * client to fallback to using other transport helper functions to
1444          * complete their request.
1445          */
1446         discover = discover_refs(service_name, 0);
1447         if (discover->version != protocol_v2) {
1448                 printf("fallback\n");
1449                 fflush(stdout);
1450                 return -1;
1451         } else {
1452                 /* Stateless Connection established */
1453                 printf("\n");
1454                 fflush(stdout);
1455         }
1456         accept_language = http_get_accept_language_header();
1457         if (accept_language)
1458                 rpc.hdr_accept_language = xstrfmt("%s", accept_language);
1459
1460         rpc.service_name = service_name;
1461         rpc.service_url = xstrfmt("%s%s", url.buf, rpc.service_name);
1462         rpc.hdr_content_type = xstrfmt("Content-Type: application/x-%s-request", rpc.service_name);
1463         rpc.hdr_accept = xstrfmt("Accept: application/x-%s-result", rpc.service_name);
1464         if (get_protocol_http_header(discover->version, &buf)) {
1465                 rpc.protocol_header = strbuf_detach(&buf, NULL);
1466         } else {
1467                 rpc.protocol_header = NULL;
1468                 strbuf_release(&buf);
1469         }
1470         rpc.buf = xmalloc(http_post_buffer);
1471         rpc.alloc = http_post_buffer;
1472         rpc.len = 0;
1473         rpc.pos = 0;
1474         rpc.in = 1;
1475         rpc.out = 0;
1476         rpc.any_written = 0;
1477         rpc.gzip_request = 1;
1478         rpc.initial_buffer = 0;
1479         rpc.write_line_lengths = 1;
1480         rpc.flush_read_but_not_sent = 0;
1481
1482         /*
1483          * Dump the capability listing that we got from the server earlier
1484          * during the info/refs request.
1485          */
1486         write_or_die(rpc.in, discover->buf, discover->len);
1487
1488         /* Until we see EOF keep sending POSTs */
1489         while (1) {
1490                 size_t avail;
1491                 enum packet_read_status status;
1492
1493                 if (!rpc_read_from_out(&rpc, PACKET_READ_GENTLE_ON_EOF, &avail,
1494                                        &status))
1495                         BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
1496                 if (status == PACKET_READ_EOF)
1497                         break;
1498                 if (post_rpc(&rpc, 1, status == PACKET_READ_FLUSH))
1499                         /* We would have an err here */
1500                         break;
1501                 /* Reset the buffer for next request */
1502                 rpc.len = 0;
1503         }
1504
1505         free(rpc.service_url);
1506         free(rpc.hdr_content_type);
1507         free(rpc.hdr_accept);
1508         free(rpc.hdr_accept_language);
1509         free(rpc.protocol_header);
1510         free(rpc.buf);
1511         strbuf_release(&buf);
1512
1513         return 0;
1514 }
1515
1516 int cmd_main(int argc, const char **argv)
1517 {
1518         struct strbuf buf = STRBUF_INIT;
1519         int nongit;
1520         int ret = 1;
1521
1522         setup_git_directory_gently(&nongit);
1523         if (argc < 2) {
1524                 error(_("remote-curl: usage: git remote-curl <remote> [<url>]"));
1525                 goto cleanup;
1526         }
1527
1528         options.verbosity = 1;
1529         options.progress = !!isatty(2);
1530         options.thin = 1;
1531         string_list_init_dup(&options.deepen_not);
1532         string_list_init_dup(&options.push_options);
1533
1534         /*
1535          * Just report "remote-curl" here (folding all the various aliases
1536          * ("git-remote-http", "git-remote-https", and etc.) here since they
1537          * are all just copies of the same actual executable.
1538          */
1539         trace2_cmd_name("remote-curl");
1540
1541         remote = remote_get(argv[1]);
1542
1543         if (argc > 2) {
1544                 end_url_with_slash(&url, argv[2]);
1545         } else {
1546                 end_url_with_slash(&url, remote->url[0]);
1547         }
1548
1549         http_init(remote, url.buf, 0);
1550
1551         do {
1552                 const char *arg;
1553
1554                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1555                         if (ferror(stdin))
1556                                 error(_("remote-curl: error reading command stream from git"));
1557                         goto cleanup;
1558                 }
1559                 if (buf.len == 0)
1560                         break;
1561                 if (starts_with(buf.buf, "fetch ")) {
1562                         if (nongit)
1563                                 die(_("remote-curl: fetch attempted without a local repo"));
1564                         parse_fetch(&buf);
1565
1566                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1567                         int for_push = !!strstr(buf.buf + 4, "for-push");
1568                         output_refs(get_refs(for_push));
1569
1570                 } else if (starts_with(buf.buf, "push ")) {
1571                         parse_push(&buf);
1572
1573                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1574                         char *value = strchr(arg, ' ');
1575                         int result;
1576
1577                         if (value)
1578                                 *value++ = '\0';
1579                         else
1580                                 value = "true";
1581
1582                         result = set_option(arg, value);
1583                         if (!result)
1584                                 printf("ok\n");
1585                         else if (result < 0)
1586                                 printf("error invalid value\n");
1587                         else
1588                                 printf("unsupported\n");
1589                         fflush(stdout);
1590
1591                 } else if (skip_prefix(buf.buf, "get ", &arg)) {
1592                         parse_get(arg);
1593                         fflush(stdout);
1594
1595                 } else if (!strcmp(buf.buf, "capabilities")) {
1596                         printf("stateless-connect\n");
1597                         printf("fetch\n");
1598                         printf("get\n");
1599                         printf("option\n");
1600                         printf("push\n");
1601                         printf("check-connectivity\n");
1602                         printf("object-format\n");
1603                         printf("\n");
1604                         fflush(stdout);
1605                 } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1606                         if (!stateless_connect(arg))
1607                                 break;
1608                 } else {
1609                         error(_("remote-curl: unknown command '%s' from git"), buf.buf);
1610                         goto cleanup;
1611                 }
1612                 strbuf_reset(&buf);
1613         } while (1);
1614
1615         http_cleanup();
1616         ret = 0;
1617 cleanup:
1618         strbuf_release(&buf);
1619
1620         return ret;
1621 }