remote-curl.c

   1 #include "git-compat-util.h"
   2 #include "alloc.h"
   3 #include "config.h"
   4 #include "environment.h"
   5 #include "gettext.h"
   6 #include "hex.h"
   7 #include "remote.h"
   8 #include "connect.h"
   9 #include "strbuf.h"
  10 #include "walker.h"
  11 #include "http.h"
  12 #include "exec-cmd.h"
  13 #include "run-command.h"
  14 #include "pkt-line.h"
  15 #include "string-list.h"
  16 #include "sideband.h"
  17 #include "strvec.h"
  18 #include "credential.h"
  19 #include "oid-array.h"
  20 #include "send-pack.h"
  21 #include "setup.h"
  22 #include "protocol.h"
  23 #include "quote.h"
  24 #include "transport.h"
  25 #include "write-or-die.h"
  26
  27 static struct remote *remote;
  28 /* always ends with a trailing slash */
  29 static struct strbuf url = STRBUF_INIT;
  30
  31 struct options {
  32         int verbosity;
  33         unsigned long depth;
  34         char *deepen_since;
  35         struct string_list deepen_not;
  36         struct string_list push_options;
  37         char *filter;
  38         unsigned progress : 1,
  39                 check_self_contained_and_connected : 1,
  40                 cloning : 1,
  41                 update_shallow : 1,
  42                 followtags : 1,
  43                 dry_run : 1,
  44                 thin : 1,
  45                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
  46                 push_cert : 2,
  47                 deepen_relative : 1,
  48
  49                 /* see documentation of corresponding flag in fetch-pack.h */
  50                 from_promisor : 1,
  51
  52                 refetch : 1,
  53                 atomic : 1,
  54                 object_format : 1,
  55                 force_if_includes : 1;
  56         const struct git_hash_algo *hash_algo;
  57 };
  58 static struct options options;
  59 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  60
  61 static int set_option(const char *name, const char *value)
  62 {
  63         if (!strcmp(name, "verbosity")) {
  64                 char *end;
  65                 int v = strtol(value, &end, 10);
  66                 if (value == end || *end)
  67                         return -1;
  68                 options.verbosity = v;
  69                 return 0;
  70         }
  71         else if (!strcmp(name, "progress")) {
  72                 if (!strcmp(value, "true"))
  73                         options.progress = 1;
  74                 else if (!strcmp(value, "false"))
  75                         options.progress = 0;
  76                 else
  77                         return -1;
  78                 return 0;
  79         }
  80         else if (!strcmp(name, "depth")) {
  81                 char *end;
  82                 unsigned long v = strtoul(value, &end, 10);
  83                 if (value == end || *end)
  84                         return -1;
  85                 options.depth = v;
  86                 return 0;
  87         }
  88         else if (!strcmp(name, "deepen-since")) {
  89                 options.deepen_since = xstrdup(value);
  90                 return 0;
  91         }
  92         else if (!strcmp(name, "deepen-not")) {
  93                 string_list_append(&options.deepen_not, value);
  94                 return 0;
  95         }
  96         else if (!strcmp(name, "deepen-relative")) {
  97                 if (!strcmp(value, "true"))
  98                         options.deepen_relative = 1;
  99                 else if (!strcmp(value, "false"))
 100                         options.deepen_relative = 0;
 101                 else
 102                         return -1;
 103                 return 0;
 104         }
 105         else if (!strcmp(name, "followtags")) {
 106                 if (!strcmp(value, "true"))
 107                         options.followtags = 1;
 108                 else if (!strcmp(value, "false"))
 109                         options.followtags = 0;
 110                 else
 111                         return -1;
 112                 return 0;
 113         }
 114         else if (!strcmp(name, "dry-run")) {
 115                 if (!strcmp(value, "true"))
 116                         options.dry_run = 1;
 117                 else if (!strcmp(value, "false"))
 118                         options.dry_run = 0;
 119                 else
 120                         return -1;
 121                 return 0;
 122         }
 123         else if (!strcmp(name, "check-connectivity")) {
 124                 if (!strcmp(value, "true"))
 125                         options.check_self_contained_and_connected = 1;
 126                 else if (!strcmp(value, "false"))
 127                         options.check_self_contained_and_connected = 0;
 128                 else
 129                         return -1;
 130                 return 0;
 131         }
 132         else if (!strcmp(name, "cas")) {
 133                 struct strbuf val = STRBUF_INIT;
 134                 strbuf_addstr(&val, "--force-with-lease=");
 135                 if (*value != '"')
 136                         strbuf_addstr(&val, value);
 137                 else if (unquote_c_style(&val, value, NULL))
 138                         return -1;
 139                 string_list_append(&cas_options, val.buf);
 140                 strbuf_release(&val);
 141                 return 0;
 142         } else if (!strcmp(name, TRANS_OPT_FORCE_IF_INCLUDES)) {
 143                 if (!strcmp(value, "true"))
 144                         options.force_if_includes = 1;
 145                 else if (!strcmp(value, "false"))
 146                         options.force_if_includes = 0;
 147                 else
 148                         return -1;
 149                 return 0;
 150         } else if (!strcmp(name, "cloning")) {
 151                 if (!strcmp(value, "true"))
 152                         options.cloning = 1;
 153                 else if (!strcmp(value, "false"))
 154                         options.cloning = 0;
 155                 else
 156                         return -1;
 157                 return 0;
 158         } else if (!strcmp(name, "update-shallow")) {
 159                 if (!strcmp(value, "true"))
 160                         options.update_shallow = 1;
 161                 else if (!strcmp(value, "false"))
 162                         options.update_shallow = 0;
 163                 else
 164                         return -1;
 165                 return 0;
 166         } else if (!strcmp(name, "pushcert")) {
 167                 if (!strcmp(value, "true"))
 168                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 169                 else if (!strcmp(value, "false"))
 170                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 171                 else if (!strcmp(value, "if-asked"))
 172                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 173                 else
 174                         return -1;
 175                 return 0;
 176         } else if (!strcmp(name, "atomic")) {
 177                 if (!strcmp(value, "true"))
 178                         options.atomic = 1;
 179                 else if (!strcmp(value, "false"))
 180                         options.atomic = 0;
 181                 else
 182                         return -1;
 183                 return 0;
 184         } else if (!strcmp(name, "push-option")) {
 185                 if (*value != '"')
 186                         string_list_append(&options.push_options, value);
 187                 else {
 188                         struct strbuf unquoted = STRBUF_INIT;
 189                         if (unquote_c_style(&unquoted, value, NULL) < 0)
 190                                 die(_("invalid quoting in push-option value: '%s'"), value);
 191                         string_list_append_nodup(&options.push_options,
 192                                                  strbuf_detach(&unquoted, NULL));
 193                 }
 194                 return 0;
 195         } else if (!strcmp(name, "family")) {
 196                 if (!strcmp(value, "ipv4"))
 197                         git_curl_ipresolve = CURL_IPRESOLVE_V4;
 198                 else if (!strcmp(value, "ipv6"))
 199                         git_curl_ipresolve = CURL_IPRESOLVE_V6;
 200                 else if (!strcmp(value, "all"))
 201                         git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 202                 else
 203                         return -1;
 204                 return 0;
 205         } else if (!strcmp(name, "from-promisor")) {
 206                 options.from_promisor = 1;
 207                 return 0;
 208         } else if (!strcmp(name, "refetch")) {
 209                 options.refetch = 1;
 210                 return 0;
 211         } else if (!strcmp(name, "filter")) {
 212                 options.filter = xstrdup(value);
 213                 return 0;
 214         } else if (!strcmp(name, "object-format")) {
 215                 int algo;
 216                 options.object_format = 1;
 217                 if (strcmp(value, "true")) {
 218                         algo = hash_algo_by_name(value);
 219                         if (algo == GIT_HASH_UNKNOWN)
 220                                 die("unknown object format '%s'", value);
 221                         options.hash_algo = &hash_algos[algo];
 222                 }
 223                 return 0;
 224         } else {
 225                 return 1 /* unsupported */;
 226         }
 227 }
 228
 229 struct discovery {
 230         char *service;
 231         char *buf_alloc;
 232         char *buf;
 233         size_t len;
 234         struct ref *refs;
 235         struct oid_array shallow;
 236         enum protocol_version version;
 237         unsigned proto_git : 1;
 238 };
 239 static struct discovery *last_discovery;
 240
 241 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 242 {
 243         struct ref *list = NULL;
 244         struct packet_reader reader;
 245
 246         packet_reader_init(&reader, -1, heads->buf, heads->len,
 247                            PACKET_READ_CHOMP_NEWLINE |
 248                            PACKET_READ_GENTLE_ON_EOF |
 249                            PACKET_READ_DIE_ON_ERR_PACKET);
 250
 251         heads->version = discover_version(&reader);
 252         switch (heads->version) {
 253         case protocol_v2:
 254                 /*
 255                  * Do nothing.  This isn't a list of refs but rather a
 256                  * capability advertisement.  Client would have run
 257                  * 'stateless-connect' so we'll dump this capability listing
 258                  * and let them request the refs themselves.
 259                  */
 260                 break;
 261         case protocol_v1:
 262         case protocol_v0:
 263                 get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
 264                                  NULL, &heads->shallow);
 265                 options.hash_algo = reader.hash_algo;
 266                 break;
 267         case protocol_unknown_version:
 268                 BUG("unknown protocol version");
 269         }
 270
 271         return list;
 272 }
 273
 274 static const struct git_hash_algo *detect_hash_algo(struct discovery *heads)
 275 {
 276         const char *p = memchr(heads->buf, '\t', heads->len);
 277         int algo;
 278         if (!p)
 279                 return the_hash_algo;
 280
 281         algo = hash_algo_by_length((p - heads->buf) / 2);
 282         if (algo == GIT_HASH_UNKNOWN)
 283                 return NULL;
 284         return &hash_algos[algo];
 285 }
 286
 287 static struct ref *parse_info_refs(struct discovery *heads)
 288 {
 289         char *data, *start, *mid;
 290         char *ref_name;
 291         int i = 0;
 292
 293         struct ref *refs = NULL;
 294         struct ref *ref = NULL;
 295         struct ref *last_ref = NULL;
 296
 297         options.hash_algo = detect_hash_algo(heads);
 298         if (!options.hash_algo)
 299                 die("%sinfo/refs not valid: could not determine hash algorithm; "
 300                     "is this a git repository?",
 301                     transport_anonymize_url(url.buf));
 302
 303         data = heads->buf;
 304         start = NULL;
 305         mid = data;
 306         while (i < heads->len) {
 307                 if (!start) {
 308                         start = &data[i];
 309                 }
 310                 if (data[i] == '\t')
 311                         mid = &data[i];
 312                 if (data[i] == '\n') {
 313                         if (mid - start != options.hash_algo->hexsz)
 314                                 die(_("%sinfo/refs not valid: is this a git repository?"),
 315                                     transport_anonymize_url(url.buf));
 316                         data[i] = 0;
 317                         ref_name = mid + 1;
 318                         ref = alloc_ref(ref_name);
 319                         get_oid_hex_algop(start, &ref->old_oid, options.hash_algo);
 320                         if (!refs)
 321                                 refs = ref;
 322                         if (last_ref)
 323                                 last_ref->next = ref;
 324                         last_ref = ref;
 325                         start = NULL;
 326                 }
 327                 i++;
 328         }
 329
 330         ref = alloc_ref("HEAD");
 331         if (!http_fetch_ref(url.buf, ref) &&
 332             !resolve_remote_symref(ref, refs)) {
 333                 ref->next = refs;
 334                 refs = ref;
 335         } else {
 336                 free(ref);
 337         }
 338
 339         return refs;
 340 }
 341
 342 static void free_discovery(struct discovery *d)
 343 {
 344         if (d) {
 345                 if (d == last_discovery)
 346                         last_discovery = NULL;
 347                 free(d->shallow.oid);
 348                 free(d->buf_alloc);
 349                 free_refs(d->refs);
 350                 free(d->service);
 351                 free(d);
 352         }
 353 }
 354
 355 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 356                              struct strbuf *msg)
 357 {
 358         const char *p, *eol;
 359
 360         /*
 361          * We only show text/plain parts, as other types are likely
 362          * to be ugly to look at on the user's terminal.
 363          */
 364         if (strcmp(type->buf, "text/plain"))
 365                 return -1;
 366         if (charset->len)
 367                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 368
 369         strbuf_trim(msg);
 370         if (!msg->len)
 371                 return -1;
 372
 373         p = msg->buf;
 374         do {
 375                 eol = strchrnul(p, '\n');
 376                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 377                 p = eol + 1;
 378         } while(*eol);
 379         return 0;
 380 }
 381
 382 static int get_protocol_http_header(enum protocol_version version,
 383                                     struct strbuf *header)
 384 {
 385         if (version > 0) {
 386                 strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
 387                             version);
 388
 389                 return 1;
 390         }
 391
 392         return 0;
 393 }
 394
 395 static void check_smart_http(struct discovery *d, const char *service,
 396                              struct strbuf *type)
 397 {
 398         const char *p;
 399         struct packet_reader reader;
 400
 401         /*
 402          * If we don't see x-$service-advertisement, then it's not smart-http.
 403          * But once we do, we commit to it and assume any other protocol
 404          * violations are hard errors.
 405          */
 406         if (!skip_prefix(type->buf, "application/x-", &p) ||
 407             !skip_prefix(p, service, &p) ||
 408             strcmp(p, "-advertisement"))
 409                 return;
 410
 411         packet_reader_init(&reader, -1, d->buf, d->len,
 412                            PACKET_READ_CHOMP_NEWLINE |
 413                            PACKET_READ_DIE_ON_ERR_PACKET);
 414         if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
 415                 die(_("invalid server response; expected service, got flush packet"));
 416
 417         if (skip_prefix(reader.line, "# service=", &p) && !strcmp(p, service)) {
 418                 /*
 419                  * The header can include additional metadata lines, up
 420                  * until a packet flush marker.  Ignore these now, but
 421                  * in the future we might start to scan them.
 422                  */
 423                 for (;;) {
 424                         packet_reader_read(&reader);
 425                         if (reader.pktlen <= 0) {
 426                                 break;
 427                         }
 428                 }
 429
 430                 /*
 431                  * v0 smart http; callers expect us to soak up the
 432                  * service and header packets
 433                  */
 434                 d->buf = reader.src_buffer;
 435                 d->len = reader.src_len;
 436                 d->proto_git = 1;
 437
 438         } else if (!strcmp(reader.line, "version 2")) {
 439                 /*
 440                  * v2 smart http; do not consume version packet, which will
 441                  * be handled elsewhere.
 442                  */
 443                 d->proto_git = 1;
 444
 445         } else {
 446                 die(_("invalid server response; got '%s'"), reader.line);
 447         }
 448 }
 449
 450 static struct discovery *discover_refs(const char *service, int for_push)
 451 {
 452         struct strbuf type = STRBUF_INIT;
 453         struct strbuf charset = STRBUF_INIT;
 454         struct strbuf buffer = STRBUF_INIT;
 455         struct strbuf refs_url = STRBUF_INIT;
 456         struct strbuf effective_url = STRBUF_INIT;
 457         struct strbuf protocol_header = STRBUF_INIT;
 458         struct string_list extra_headers = STRING_LIST_INIT_DUP;
 459         struct discovery *last = last_discovery;
 460         int http_ret, maybe_smart = 0;
 461         struct http_get_options http_options;
 462         enum protocol_version version = get_protocol_version_config();
 463
 464         if (last && !strcmp(service, last->service))
 465                 return last;
 466         free_discovery(last);
 467
 468         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 469         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 470              git_env_bool("GIT_SMART_HTTP", 1)) {
 471                 maybe_smart = 1;
 472                 if (!strchr(url.buf, '?'))
 473                         strbuf_addch(&refs_url, '?');
 474                 else
 475                         strbuf_addch(&refs_url, '&');
 476                 strbuf_addf(&refs_url, "service=%s", service);
 477         }
 478
 479         /*
 480          * NEEDSWORK: If we are trying to use protocol v2 and we are planning
 481          * to perform a push, then fallback to v0 since the client doesn't know
 482          * how to push yet using v2.
 483          */
 484         if (version == protocol_v2 && !strcmp("git-receive-pack", service))
 485                 version = protocol_v0;
 486
 487         /* Add the extra Git-Protocol header */
 488         if (get_protocol_http_header(version, &protocol_header))
 489                 string_list_append(&extra_headers, protocol_header.buf);
 490
 491         memset(&http_options, 0, sizeof(http_options));
 492         http_options.content_type = &type;
 493         http_options.charset = &charset;
 494         http_options.effective_url = &effective_url;
 495         http_options.base_url = &url;
 496         http_options.extra_headers = &extra_headers;
 497         http_options.initial_request = 1;
 498         http_options.no_cache = 1;
 499
 500         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 501         switch (http_ret) {
 502         case HTTP_OK:
 503                 break;
 504         case HTTP_MISSING_TARGET:
 505                 show_http_message(&type, &charset, &buffer);
 506                 die(_("repository '%s' not found"),
 507                     transport_anonymize_url(url.buf));
 508         case HTTP_NOAUTH:
 509                 show_http_message(&type, &charset, &buffer);
 510                 die(_("Authentication failed for '%s'"),
 511                     transport_anonymize_url(url.buf));
 512         case HTTP_NOMATCHPUBLICKEY:
 513                 show_http_message(&type, &charset, &buffer);
 514                 die(_("unable to access '%s' with http.pinnedPubkey configuration: %s"),
 515                     transport_anonymize_url(url.buf), curl_errorstr);
 516         default:
 517                 show_http_message(&type, &charset, &buffer);
 518                 die(_("unable to access '%s': %s"),
 519                     transport_anonymize_url(url.buf), curl_errorstr);
 520         }
 521
 522         if (options.verbosity && !starts_with(refs_url.buf, url.buf)) {
 523                 char *u = transport_anonymize_url(url.buf);
 524                 warning(_("redirecting to %s"), u);
 525                 free(u);
 526         }
 527
 528         last= xcalloc(1, sizeof(*last_discovery));
 529         last->service = xstrdup(service);
 530         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 531         last->buf = last->buf_alloc;
 532
 533         if (maybe_smart)
 534                 check_smart_http(last, service, &type);
 535
 536         if (last->proto_git)
 537                 last->refs = parse_git_refs(last, for_push);
 538         else
 539                 last->refs = parse_info_refs(last);
 540
 541         strbuf_release(&refs_url);
 542         strbuf_release(&type);
 543         strbuf_release(&charset);
 544         strbuf_release(&effective_url);
 545         strbuf_release(&buffer);
 546         strbuf_release(&protocol_header);
 547         string_list_clear(&extra_headers, 0);
 548         last_discovery = last;
 549         return last;
 550 }
 551
 552 static struct ref *get_refs(int for_push)
 553 {
 554         struct discovery *heads;
 555
 556         if (for_push)
 557                 heads = discover_refs("git-receive-pack", for_push);
 558         else
 559                 heads = discover_refs("git-upload-pack", for_push);
 560
 561         return heads->refs;
 562 }
 563
 564 static void output_refs(struct ref *refs)
 565 {
 566         struct ref *posn;
 567         if (options.object_format && options.hash_algo) {
 568                 printf(":object-format %s\n", options.hash_algo->name);
 569                 repo_set_hash_algo(the_repository,
 570                                 hash_algo_by_ptr(options.hash_algo));
 571         }
 572         for (posn = refs; posn; posn = posn->next) {
 573                 if (posn->symref)
 574                         printf("@%s %s\n", posn->symref, posn->name);
 575                 else
 576                         printf("%s %s\n", hash_to_hex_algop(posn->old_oid.hash,
 577                                                             options.hash_algo),
 578                                           posn->name);
 579         }
 580         printf("\n");
 581         fflush(stdout);
 582 }
 583
 584 struct rpc_state {
 585         const char *service_name;
 586         char *service_url;
 587         char *hdr_content_type;
 588         char *hdr_accept;
 589         char *hdr_accept_language;
 590         char *protocol_header;
 591         char *buf;
 592         size_t alloc;
 593         size_t len;
 594         size_t pos;
 595         int in;
 596         int out;
 597         int any_written;
 598         unsigned gzip_request : 1;
 599         unsigned initial_buffer : 1;
 600
 601         /*
 602          * Whenever a pkt-line is read into buf, append the 4 characters
 603          * denoting its length before appending the payload.
 604          */
 605         unsigned write_line_lengths : 1;
 606
 607         /*
 608          * Used by rpc_out; initialize to 0. This is true if a flush has been
 609          * read, but the corresponding line length (if write_line_lengths is
 610          * true) and EOF have not been sent to libcurl. Since each flush marks
 611          * the end of a request, each flush must be completely sent before any
 612          * further reading occurs.
 613          */
 614         unsigned flush_read_but_not_sent : 1;
 615 };
 616
 617 #define RPC_STATE_INIT { 0 }
 618
 619 /*
 620  * Appends the result of reading from rpc->out to the string represented by
 621  * rpc->buf and rpc->len if there is enough space. Returns 1 if there was
 622  * enough space, 0 otherwise.
 623  *
 624  * If rpc->write_line_lengths is true, appends the line length as a 4-byte
 625  * hexadecimal string before appending the result described above.
 626  *
 627  * Writes the total number of bytes appended into appended.
 628  */
 629 static int rpc_read_from_out(struct rpc_state *rpc, int options,
 630                              size_t *appended,
 631                              enum packet_read_status *status) {
 632         size_t left;
 633         char *buf;
 634         int pktlen_raw;
 635
 636         if (rpc->write_line_lengths) {
 637                 left = rpc->alloc - rpc->len - 4;
 638                 buf = rpc->buf + rpc->len + 4;
 639         } else {
 640                 left = rpc->alloc - rpc->len;
 641                 buf = rpc->buf + rpc->len;
 642         }
 643
 644         if (left < LARGE_PACKET_MAX)
 645                 return 0;
 646
 647         *status = packet_read_with_status(rpc->out, NULL, NULL, buf,
 648                         left, &pktlen_raw, options);
 649         if (*status != PACKET_READ_EOF) {
 650                 *appended = pktlen_raw + (rpc->write_line_lengths ? 4 : 0);
 651                 rpc->len += *appended;
 652         }
 653
 654         if (rpc->write_line_lengths) {
 655                 switch (*status) {
 656                 case PACKET_READ_EOF:
 657                         if (!(options & PACKET_READ_GENTLE_ON_EOF))
 658                                 die(_("shouldn't have EOF when not gentle on EOF"));
 659                         break;
 660                 case PACKET_READ_NORMAL:
 661                         set_packet_header(buf - 4, *appended);
 662                         break;
 663                 case PACKET_READ_DELIM:
 664                         memcpy(buf - 4, "0001", 4);
 665                         break;
 666                 case PACKET_READ_FLUSH:
 667                         memcpy(buf - 4, "0000", 4);
 668                         break;
 669                 case PACKET_READ_RESPONSE_END:
 670                         die(_("remote server sent unexpected response end packet"));
 671                 }
 672         }
 673
 674         return 1;
 675 }
 676
 677 static size_t rpc_out(void *ptr, size_t eltsize,
 678                 size_t nmemb, void *buffer_)
 679 {
 680         size_t max = eltsize * nmemb;
 681         struct rpc_state *rpc = buffer_;
 682         size_t avail = rpc->len - rpc->pos;
 683         enum packet_read_status status;
 684
 685         if (!avail) {
 686                 rpc->initial_buffer = 0;
 687                 rpc->len = 0;
 688                 rpc->pos = 0;
 689                 if (!rpc->flush_read_but_not_sent) {
 690                         if (!rpc_read_from_out(rpc, 0, &avail, &status))
 691                                 BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
 692                         if (status == PACKET_READ_FLUSH)
 693                                 rpc->flush_read_but_not_sent = 1;
 694                 }
 695                 /*
 696                  * If flush_read_but_not_sent is true, we have already read one
 697                  * full request but have not fully sent it + EOF, which is why
 698                  * we need to refrain from reading.
 699                  */
 700         }
 701         if (rpc->flush_read_but_not_sent) {
 702                 if (!avail) {
 703                         /*
 704                          * The line length either does not need to be sent at
 705                          * all or has already been completely sent. Now we can
 706                          * return 0, indicating EOF, meaning that the flush has
 707                          * been fully sent.
 708                          */
 709                         rpc->flush_read_but_not_sent = 0;
 710                         return 0;
 711                 }
 712                 /*
 713                  * If avail is non-zero, the line length for the flush still
 714                  * hasn't been fully sent. Proceed with sending the line
 715                  * length.
 716                  */
 717         }
 718
 719         if (max < avail)
 720                 avail = max;
 721         memcpy(ptr, rpc->buf + rpc->pos, avail);
 722         rpc->pos += avail;
 723         return avail;
 724 }
 725
 726 static int rpc_seek(void *clientp, curl_off_t offset, int origin)
 727 {
 728         struct rpc_state *rpc = clientp;
 729
 730         if (origin != SEEK_SET)
 731                 BUG("rpc_seek only handles SEEK_SET, not %d", origin);
 732
 733         if (rpc->initial_buffer) {
 734                 if (offset < 0 || offset > rpc->len) {
 735                         error("curl seek would be outside of rpc buffer");
 736                         return CURL_SEEKFUNC_FAIL;
 737                 }
 738                 rpc->pos = offset;
 739                 return CURL_SEEKFUNC_OK;
 740         }
 741         error(_("unable to rewind rpc post data - try increasing http.postBuffer"));
 742         return CURL_SEEKFUNC_FAIL;
 743 }
 744
 745 struct check_pktline_state {
 746         char len_buf[4];
 747         int len_filled;
 748         int remaining;
 749 };
 750
 751 static void check_pktline(struct check_pktline_state *state, const char *ptr, size_t size)
 752 {
 753         while (size) {
 754                 if (!state->remaining) {
 755                         int digits_remaining = 4 - state->len_filled;
 756                         if (digits_remaining > size)
 757                                 digits_remaining = size;
 758                         memcpy(&state->len_buf[state->len_filled], ptr, digits_remaining);
 759                         state->len_filled += digits_remaining;
 760                         ptr += digits_remaining;
 761                         size -= digits_remaining;
 762
 763                         if (state->len_filled == 4) {
 764                                 state->remaining = packet_length(state->len_buf);
 765                                 if (state->remaining < 0) {
 766                                         die(_("remote-curl: bad line length character: %.4s"), state->len_buf);
 767                                 } else if (state->remaining == 2) {
 768                                         die(_("remote-curl: unexpected response end packet"));
 769                                 } else if (state->remaining < 4) {
 770                                         state->remaining = 0;
 771                                 } else {
 772                                         state->remaining -= 4;
 773                                 }
 774                                 state->len_filled = 0;
 775                         }
 776                 }
 777
 778                 if (state->remaining) {
 779                         int remaining = state->remaining;
 780                         if (remaining > size)
 781                                 remaining = size;
 782                         ptr += remaining;
 783                         size -= remaining;
 784                         state->remaining -= remaining;
 785                 }
 786         }
 787 }
 788
 789 struct rpc_in_data {
 790         struct rpc_state *rpc;
 791         struct active_request_slot *slot;
 792         int check_pktline;
 793         struct check_pktline_state pktline_state;
 794 };
 795
 796 /*
 797  * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
 798  * from ptr.
 799  */
 800 static size_t rpc_in(char *ptr, size_t eltsize,
 801                 size_t nmemb, void *buffer_)
 802 {
 803         size_t size = eltsize * nmemb;
 804         struct rpc_in_data *data = buffer_;
 805         long response_code;
 806
 807         if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
 808                               &response_code) != CURLE_OK)
 809                 return size;
 810         if (response_code >= 300)
 811                 return size;
 812         if (size)
 813                 data->rpc->any_written = 1;
 814         if (data->check_pktline)
 815                 check_pktline(&data->pktline_state, ptr, size);
 816         write_or_die(data->rpc->in, ptr, size);
 817         return size;
 818 }
 819
 820 static int run_slot(struct active_request_slot *slot,
 821                     struct slot_results *results)
 822 {
 823         int err;
 824         struct slot_results results_buf;
 825
 826         if (!results)
 827                 results = &results_buf;
 828
 829         err = run_one_slot(slot, results);
 830
 831         if (err != HTTP_OK && err != HTTP_REAUTH) {
 832                 struct strbuf msg = STRBUF_INIT;
 833                 if (results->http_code && results->http_code != 200)
 834                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 835                 if (results->curl_result != CURLE_OK) {
 836                         if (msg.len)
 837                                 strbuf_addch(&msg, ' ');
 838                         strbuf_addf(&msg, "curl %d", results->curl_result);
 839                         if (curl_errorstr[0]) {
 840                                 strbuf_addch(&msg, ' ');
 841                                 strbuf_addstr(&msg, curl_errorstr);
 842                         }
 843                 }
 844                 error(_("RPC failed; %s"), msg.buf);
 845                 strbuf_release(&msg);
 846         }
 847
 848         return err;
 849 }
 850
 851 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 852 {
 853         struct active_request_slot *slot;
 854         struct curl_slist *headers = http_copy_default_headers();
 855         struct strbuf buf = STRBUF_INIT;
 856         int err;
 857
 858         slot = get_active_slot();
 859
 860         headers = curl_slist_append(headers, rpc->hdr_content_type);
 861         headers = curl_slist_append(headers, rpc->hdr_accept);
 862
 863         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 864         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 865         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 866         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 867         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 868         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 869         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 870         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 871         curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, &buf);
 872
 873         err = run_slot(slot, results);
 874
 875         curl_slist_free_all(headers);
 876         strbuf_release(&buf);
 877         return err;
 878 }
 879
 880 static curl_off_t xcurl_off_t(size_t len)
 881 {
 882         uintmax_t size = len;
 883         if (size > maximum_signed_value_of_type(curl_off_t))
 884                 die(_("cannot handle pushes this big"));
 885         return (curl_off_t)size;
 886 }
 887
 888 /*
 889  * If flush_received is true, do not attempt to read any more; just use what's
 890  * in rpc->buf.
 891  */
 892 static int post_rpc(struct rpc_state *rpc, int stateless_connect, int flush_received)
 893 {
 894         struct active_request_slot *slot;
 895         struct curl_slist *headers = http_copy_default_headers();
 896         int use_gzip = rpc->gzip_request;
 897         char *gzip_body = NULL;
 898         size_t gzip_size = 0;
 899         int err, large_request = 0;
 900         int needs_100_continue = 0;
 901         struct rpc_in_data rpc_in_data;
 902
 903         /* Try to load the entire request, if we can fit it into the
 904          * allocated buffer space we can use HTTP/1.0 and avoid the
 905          * chunked encoding mess.
 906          */
 907         if (!flush_received) {
 908                 while (1) {
 909                         size_t n;
 910                         enum packet_read_status status;
 911
 912                         if (!rpc_read_from_out(rpc, 0, &n, &status)) {
 913                                 large_request = 1;
 914                                 use_gzip = 0;
 915                                 break;
 916                         }
 917                         if (status == PACKET_READ_FLUSH)
 918                                 break;
 919                 }
 920         }
 921
 922         if (large_request) {
 923                 struct slot_results results;
 924
 925                 do {
 926                         err = probe_rpc(rpc, &results);
 927                         if (err == HTTP_REAUTH)
 928                                 credential_fill(&http_auth);
 929                 } while (err == HTTP_REAUTH);
 930                 if (err != HTTP_OK)
 931                         return -1;
 932
 933                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 934                         needs_100_continue = 1;
 935         }
 936
 937         headers = curl_slist_append(headers, rpc->hdr_content_type);
 938         headers = curl_slist_append(headers, rpc->hdr_accept);
 939         headers = curl_slist_append(headers, needs_100_continue ?
 940                 "Expect: 100-continue" : "Expect:");
 941
 942         /* Add Accept-Language header */
 943         if (rpc->hdr_accept_language)
 944                 headers = curl_slist_append(headers, rpc->hdr_accept_language);
 945
 946         /* Add the extra Git-Protocol header */
 947         if (rpc->protocol_header)
 948                 headers = curl_slist_append(headers, rpc->protocol_header);
 949
 950 retry:
 951         slot = get_active_slot();
 952
 953         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 954         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 955         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 956         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 957
 958         if (large_request) {
 959                 /* The request body is large and the size cannot be predicted.
 960                  * We must use chunked encoding to send it.
 961                  */
 962                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 963                 rpc->initial_buffer = 1;
 964                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 965                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 966                 curl_easy_setopt(slot->curl, CURLOPT_SEEKFUNCTION, rpc_seek);
 967                 curl_easy_setopt(slot->curl, CURLOPT_SEEKDATA, rpc);
 968                 if (options.verbosity > 1) {
 969                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 970                         fflush(stderr);
 971                 }
 972
 973         } else if (gzip_body) {
 974                 /*
 975                  * If we are looping to retry authentication, then the previous
 976                  * run will have set up the headers and gzip buffer already,
 977                  * and we just need to send it.
 978                  */
 979                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 980                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 981
 982         } else if (use_gzip && 1024 < rpc->len) {
 983                 /* The client backend isn't giving us compressed data so
 984                  * we can try to deflate it ourselves, this may save on
 985                  * the transfer time.
 986                  */
 987                 git_zstream stream;
 988                 int ret;
 989
 990                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 991                 gzip_size = git_deflate_bound(&stream, rpc->len);
 992                 gzip_body = xmalloc(gzip_size);
 993
 994                 stream.next_in = (unsigned char *)rpc->buf;
 995                 stream.avail_in = rpc->len;
 996                 stream.next_out = (unsigned char *)gzip_body;
 997                 stream.avail_out = gzip_size;
 998
 999                 ret = git_deflate(&stream, Z_FINISH);
1000                 if (ret != Z_STREAM_END)
1001                         die(_("cannot deflate request; zlib deflate error %d"), ret);
1002
1003                 ret = git_deflate_end_gently(&stream);
1004                 if (ret != Z_OK)
1005                         die(_("cannot deflate request; zlib end error %d"), ret);
1006
1007                 gzip_size = stream.total_out;
1008
1009                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
1010                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
1011                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
1012
1013                 if (options.verbosity > 1) {
1014                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
1015                                 rpc->service_name,
1016                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
1017                         fflush(stderr);
1018                 }
1019         } else {
1020                 /* We know the complete request size in advance, use the
1021                  * more normal Content-Length approach.
1022                  */
1023                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
1024                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
1025                 if (options.verbosity > 1) {
1026                         fprintf(stderr, "POST %s (%lu bytes)\n",
1027                                 rpc->service_name, (unsigned long)rpc->len);
1028                         fflush(stderr);
1029                 }
1030         }
1031
1032         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1033         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
1034         rpc_in_data.rpc = rpc;
1035         rpc_in_data.slot = slot;
1036         rpc_in_data.check_pktline = stateless_connect;
1037         memset(&rpc_in_data.pktline_state, 0, sizeof(rpc_in_data.pktline_state));
1038         curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, &rpc_in_data);
1039         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1040
1041
1042         rpc->any_written = 0;
1043         err = run_slot(slot, NULL);
1044         if (err == HTTP_REAUTH && !large_request) {
1045                 credential_fill(&http_auth);
1046                 goto retry;
1047         }
1048         if (err != HTTP_OK)
1049                 err = -1;
1050
1051         if (!rpc->any_written)
1052                 err = -1;
1053
1054         if (rpc_in_data.pktline_state.len_filled)
1055                 err = error(_("%d bytes of length header were received"), rpc_in_data.pktline_state.len_filled);
1056         if (rpc_in_data.pktline_state.remaining)
1057                 err = error(_("%d bytes of body are still expected"), rpc_in_data.pktline_state.remaining);
1058
1059         if (stateless_connect)
1060                 packet_response_end(rpc->in);
1061
1062         curl_slist_free_all(headers);
1063         free(gzip_body);
1064         return err;
1065 }
1066
1067 static int rpc_service(struct rpc_state *rpc, struct discovery *heads,
1068                        const char **client_argv, const struct strbuf *preamble,
1069                        struct strbuf *rpc_result)
1070 {
1071         const char *svc = rpc->service_name;
1072         struct strbuf buf = STRBUF_INIT;
1073         struct child_process client = CHILD_PROCESS_INIT;
1074         int err = 0;
1075
1076         client.in = -1;
1077         client.out = -1;
1078         client.git_cmd = 1;
1079         strvec_pushv(&client.args, client_argv);
1080         if (start_command(&client))
1081                 exit(1);
1082         write_or_die(client.in, preamble->buf, preamble->len);
1083         if (heads)
1084                 write_or_die(client.in, heads->buf, heads->len);
1085
1086         rpc->alloc = http_post_buffer;
1087         rpc->buf = xmalloc(rpc->alloc);
1088         rpc->in = client.in;
1089         rpc->out = client.out;
1090
1091         strbuf_addf(&buf, "%s%s", url.buf, svc);
1092         rpc->service_url = strbuf_detach(&buf, NULL);
1093
1094         rpc->hdr_accept_language = xstrdup_or_null(http_get_accept_language_header());
1095
1096         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
1097         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
1098
1099         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
1100         rpc->hdr_accept = strbuf_detach(&buf, NULL);
1101
1102         if (get_protocol_http_header(heads->version, &buf))
1103                 rpc->protocol_header = strbuf_detach(&buf, NULL);
1104         else
1105                 rpc->protocol_header = NULL;
1106
1107         while (!err) {
1108                 int n = packet_read(rpc->out, rpc->buf, rpc->alloc, 0);
1109                 if (!n)
1110                         break;
1111                 rpc->pos = 0;
1112                 rpc->len = n;
1113                 err |= post_rpc(rpc, 0, 0);
1114         }
1115
1116         close(client.in);
1117         client.in = -1;
1118         if (!err) {
1119                 strbuf_read(rpc_result, client.out, 0);
1120         } else {
1121                 char buf[4096];
1122                 for (;;)
1123                         if (xread(client.out, buf, sizeof(buf)) <= 0)
1124                                 break;
1125         }
1126
1127         close(client.out);
1128         client.out = -1;
1129
1130         err |= finish_command(&client);
1131         free(rpc->service_url);
1132         free(rpc->hdr_content_type);
1133         free(rpc->hdr_accept);
1134         free(rpc->hdr_accept_language);
1135         free(rpc->protocol_header);
1136         free(rpc->buf);
1137         strbuf_release(&buf);
1138         return err;
1139 }
1140
1141 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
1142 {
1143         struct walker *walker;
1144         char **targets;
1145         int ret, i;
1146
1147         ALLOC_ARRAY(targets, nr_heads);
1148         if (options.depth || options.deepen_since)
1149                 die(_("dumb http transport does not support shallow capabilities"));
1150         for (i = 0; i < nr_heads; i++)
1151                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
1152
1153         walker = get_http_walker(url.buf);
1154         walker->get_verbosely = options.verbosity >= 3;
1155         walker->get_progress = options.progress;
1156         walker->get_recover = 0;
1157         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
1158         walker_free(walker);
1159
1160         for (i = 0; i < nr_heads; i++)
1161                 free(targets[i]);
1162         free(targets);
1163
1164         return ret ? error(_("fetch failed.")) : 0;
1165 }
1166
1167 static int fetch_git(struct discovery *heads,
1168         int nr_heads, struct ref **to_fetch)
1169 {
1170         struct rpc_state rpc = RPC_STATE_INIT;
1171         struct strbuf preamble = STRBUF_INIT;
1172         int i, err;
1173         struct strvec args = STRVEC_INIT;
1174         struct strbuf rpc_result = STRBUF_INIT;
1175
1176         strvec_pushl(&args, "fetch-pack", "--stateless-rpc",
1177                      "--stdin", "--lock-pack", NULL);
1178         if (options.followtags)
1179                 strvec_push(&args, "--include-tag");
1180         if (options.thin)
1181                 strvec_push(&args, "--thin");
1182         if (options.verbosity >= 3)
1183                 strvec_pushl(&args, "-v", "-v", NULL);
1184         if (options.check_self_contained_and_connected)
1185                 strvec_push(&args, "--check-self-contained-and-connected");
1186         if (options.cloning)
1187                 strvec_push(&args, "--cloning");
1188         if (options.update_shallow)
1189                 strvec_push(&args, "--update-shallow");
1190         if (!options.progress)
1191                 strvec_push(&args, "--no-progress");
1192         if (options.depth)
1193                 strvec_pushf(&args, "--depth=%lu", options.depth);
1194         if (options.deepen_since)
1195                 strvec_pushf(&args, "--shallow-since=%s", options.deepen_since);
1196         for (i = 0; i < options.deepen_not.nr; i++)
1197                 strvec_pushf(&args, "--shallow-exclude=%s",
1198                              options.deepen_not.items[i].string);
1199         if (options.deepen_relative && options.depth)
1200                 strvec_push(&args, "--deepen-relative");
1201         if (options.from_promisor)
1202                 strvec_push(&args, "--from-promisor");
1203         if (options.refetch)
1204                 strvec_push(&args, "--refetch");
1205         if (options.filter)
1206                 strvec_pushf(&args, "--filter=%s", options.filter);
1207         strvec_push(&args, url.buf);
1208
1209         for (i = 0; i < nr_heads; i++) {
1210                 struct ref *ref = to_fetch[i];
1211                 if (!*ref->name)
1212                         die(_("cannot fetch by sha1 over smart http"));
1213                 packet_buf_write(&preamble, "%s %s\n",
1214                                  oid_to_hex(&ref->old_oid), ref->name);
1215         }
1216         packet_buf_flush(&preamble);
1217
1218         memset(&rpc, 0, sizeof(rpc));
1219         rpc.service_name = "git-upload-pack",
1220         rpc.gzip_request = 1;
1221
1222         err = rpc_service(&rpc, heads, args.v, &preamble, &rpc_result);
1223         if (rpc_result.len)
1224                 write_or_die(1, rpc_result.buf, rpc_result.len);
1225         strbuf_release(&rpc_result);
1226         strbuf_release(&preamble);
1227         strvec_clear(&args);
1228         return err;
1229 }
1230
1231 static int fetch(int nr_heads, struct ref **to_fetch)
1232 {
1233         struct discovery *d = discover_refs("git-upload-pack", 0);
1234         if (d->proto_git)
1235                 return fetch_git(d, nr_heads, to_fetch);
1236         else
1237                 return fetch_dumb(nr_heads, to_fetch);
1238 }
1239
1240 static void parse_fetch(struct strbuf *buf)
1241 {
1242         struct ref **to_fetch = NULL;
1243         struct ref *list_head = NULL;
1244         struct ref **list = &list_head;
1245         int alloc_heads = 0, nr_heads = 0;
1246
1247         do {
1248                 const char *p;
1249                 if (skip_prefix(buf->buf, "fetch ", &p)) {
1250                         const char *name;
1251                         struct ref *ref;
1252                         struct object_id old_oid;
1253                         const char *q;
1254
1255                         if (parse_oid_hex(p, &old_oid, &q))
1256                                 die(_("protocol error: expected sha/ref, got '%s'"), p);
1257                         if (*q == ' ')
1258                                 name = q + 1;
1259                         else if (!*q)
1260                                 name = "";
1261                         else
1262                                 die(_("protocol error: expected sha/ref, got '%s'"), p);
1263
1264                         ref = alloc_ref(name);
1265                         oidcpy(&ref->old_oid, &old_oid);
1266
1267                         *list = ref;
1268                         list = &ref->next;
1269
1270                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1271                         to_fetch[nr_heads++] = ref;
1272                 }
1273                 else
1274                         die(_("http transport does not support %s"), buf->buf);
1275
1276                 strbuf_reset(buf);
1277                 if (strbuf_getline_lf(buf, stdin) == EOF)
1278                         return;
1279                 if (!*buf->buf)
1280                         break;
1281         } while (1);
1282
1283         if (fetch(nr_heads, to_fetch))
1284                 exit(128); /* error already reported */
1285         free_refs(list_head);
1286         free(to_fetch);
1287
1288         printf("\n");
1289         fflush(stdout);
1290         strbuf_reset(buf);
1291 }
1292
1293 static void parse_get(const char *arg)
1294 {
1295         struct strbuf url = STRBUF_INIT;
1296         struct strbuf path = STRBUF_INIT;
1297         const char *space;
1298
1299         space = strchr(arg, ' ');
1300
1301         if (!space)
1302                 die(_("protocol error: expected '<url> <path>', missing space"));
1303
1304         strbuf_add(&url, arg, space - arg);
1305         strbuf_addstr(&path, space + 1);
1306
1307         if (http_get_file(url.buf, path.buf, NULL))
1308                 die(_("failed to download file at URL '%s'"), url.buf);
1309
1310         strbuf_release(&url);
1311         strbuf_release(&path);
1312         printf("\n");
1313         fflush(stdout);
1314 }
1315
1316 static int push_dav(int nr_spec, const char **specs)
1317 {
1318         struct child_process child = CHILD_PROCESS_INIT;
1319         size_t i;
1320
1321         child.git_cmd = 1;
1322         strvec_push(&child.args, "http-push");
1323         strvec_push(&child.args, "--helper-status");
1324         if (options.dry_run)
1325                 strvec_push(&child.args, "--dry-run");
1326         if (options.verbosity > 1)
1327                 strvec_push(&child.args, "--verbose");
1328         strvec_push(&child.args, url.buf);
1329         for (i = 0; i < nr_spec; i++)
1330                 strvec_push(&child.args, specs[i]);
1331
1332         if (run_command(&child))
1333                 die(_("git-http-push failed"));
1334         return 0;
1335 }
1336
1337 static int push_git(struct discovery *heads, int nr_spec, const char **specs)
1338 {
1339         struct rpc_state rpc = RPC_STATE_INIT;
1340         int i, err;
1341         struct strvec args;
1342         struct string_list_item *cas_option;
1343         struct strbuf preamble = STRBUF_INIT;
1344         struct strbuf rpc_result = STRBUF_INIT;
1345
1346         strvec_init(&args);
1347         strvec_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1348                      NULL);
1349
1350         if (options.thin)
1351                 strvec_push(&args, "--thin");
1352         if (options.dry_run)
1353                 strvec_push(&args, "--dry-run");
1354         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1355                 strvec_push(&args, "--signed=yes");
1356         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1357                 strvec_push(&args, "--signed=if-asked");
1358         if (options.atomic)
1359                 strvec_push(&args, "--atomic");
1360         if (options.verbosity == 0)
1361                 strvec_push(&args, "--quiet");
1362         else if (options.verbosity > 1)
1363                 strvec_push(&args, "--verbose");
1364         for (i = 0; i < options.push_options.nr; i++)
1365                 strvec_pushf(&args, "--push-option=%s",
1366                              options.push_options.items[i].string);
1367         strvec_push(&args, options.progress ? "--progress" : "--no-progress");
1368         for_each_string_list_item(cas_option, &cas_options)
1369                 strvec_push(&args, cas_option->string);
1370         strvec_push(&args, url.buf);
1371
1372         if (options.force_if_includes)
1373                 strvec_push(&args, "--force-if-includes");
1374
1375         strvec_push(&args, "--stdin");
1376         for (i = 0; i < nr_spec; i++)
1377                 packet_buf_write(&preamble, "%s\n", specs[i]);
1378         packet_buf_flush(&preamble);
1379
1380         memset(&rpc, 0, sizeof(rpc));
1381         rpc.service_name = "git-receive-pack",
1382
1383         err = rpc_service(&rpc, heads, args.v, &preamble, &rpc_result);
1384         if (rpc_result.len)
1385                 write_or_die(1, rpc_result.buf, rpc_result.len);
1386         strbuf_release(&rpc_result);
1387         strbuf_release(&preamble);
1388         strvec_clear(&args);
1389         return err;
1390 }
1391
1392 static int push(int nr_spec, const char **specs)
1393 {
1394         struct discovery *heads = discover_refs("git-receive-pack", 1);
1395         int ret;
1396
1397         if (heads->proto_git)
1398                 ret = push_git(heads, nr_spec, specs);
1399         else
1400                 ret = push_dav(nr_spec, specs);
1401         free_discovery(heads);
1402         return ret;
1403 }
1404
1405 static void parse_push(struct strbuf *buf)
1406 {
1407         struct strvec specs = STRVEC_INIT;
1408         int ret;
1409
1410         do {
1411                 const char *arg;
1412                 if (skip_prefix(buf->buf, "push ", &arg))
1413                         strvec_push(&specs, arg);
1414                 else
1415                         die(_("http transport does not support %s"), buf->buf);
1416
1417                 strbuf_reset(buf);
1418                 if (strbuf_getline_lf(buf, stdin) == EOF)
1419                         goto free_specs;
1420                 if (!*buf->buf)
1421                         break;
1422         } while (1);
1423
1424         ret = push(specs.nr, specs.v);
1425         printf("\n");
1426         fflush(stdout);
1427
1428         if (ret)
1429                 exit(128); /* error already reported */
1430
1431 free_specs:
1432         strvec_clear(&specs);
1433 }
1434
1435 static int stateless_connect(const char *service_name)
1436 {
1437         struct discovery *discover;
1438         struct rpc_state rpc = RPC_STATE_INIT;
1439         struct strbuf buf = STRBUF_INIT;
1440         const char *accept_language;
1441
1442         /*
1443          * Run the info/refs request and see if the server supports protocol
1444          * v2.  If and only if the server supports v2 can we successfully
1445          * establish a stateless connection, otherwise we need to tell the
1446          * client to fallback to using other transport helper functions to
1447          * complete their request.
1448          */
1449         discover = discover_refs(service_name, 0);
1450         if (discover->version != protocol_v2) {
1451                 printf("fallback\n");
1452                 fflush(stdout);
1453                 return -1;
1454         } else {
1455                 /* Stateless Connection established */
1456                 printf("\n");
1457                 fflush(stdout);
1458         }
1459         accept_language = http_get_accept_language_header();
1460         if (accept_language)
1461                 rpc.hdr_accept_language = xstrfmt("%s", accept_language);
1462
1463         rpc.service_name = service_name;
1464         rpc.service_url = xstrfmt("%s%s", url.buf, rpc.service_name);
1465         rpc.hdr_content_type = xstrfmt("Content-Type: application/x-%s-request", rpc.service_name);
1466         rpc.hdr_accept = xstrfmt("Accept: application/x-%s-result", rpc.service_name);
1467         if (get_protocol_http_header(discover->version, &buf)) {
1468                 rpc.protocol_header = strbuf_detach(&buf, NULL);
1469         } else {
1470                 rpc.protocol_header = NULL;
1471                 strbuf_release(&buf);
1472         }
1473         rpc.buf = xmalloc(http_post_buffer);
1474         rpc.alloc = http_post_buffer;
1475         rpc.len = 0;
1476         rpc.pos = 0;
1477         rpc.in = 1;
1478         rpc.out = 0;
1479         rpc.any_written = 0;
1480         rpc.gzip_request = 1;
1481         rpc.initial_buffer = 0;
1482         rpc.write_line_lengths = 1;
1483         rpc.flush_read_but_not_sent = 0;
1484
1485         /*
1486          * Dump the capability listing that we got from the server earlier
1487          * during the info/refs request.
1488          */
1489         write_or_die(rpc.in, discover->buf, discover->len);
1490
1491         /* Until we see EOF keep sending POSTs */
1492         while (1) {
1493                 size_t avail;
1494                 enum packet_read_status status;
1495
1496                 if (!rpc_read_from_out(&rpc, PACKET_READ_GENTLE_ON_EOF, &avail,
1497                                        &status))
1498                         BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
1499                 if (status == PACKET_READ_EOF)
1500                         break;
1501                 if (post_rpc(&rpc, 1, status == PACKET_READ_FLUSH))
1502                         /* We would have an err here */
1503                         break;
1504                 /* Reset the buffer for next request */
1505                 rpc.len = 0;
1506         }
1507
1508         free(rpc.service_url);
1509         free(rpc.hdr_content_type);
1510         free(rpc.hdr_accept);
1511         free(rpc.hdr_accept_language);
1512         free(rpc.protocol_header);
1513         free(rpc.buf);
1514         strbuf_release(&buf);
1515
1516         return 0;
1517 }
1518
1519 int cmd_main(int argc, const char **argv)
1520 {
1521         struct strbuf buf = STRBUF_INIT;
1522         int nongit;
1523         int ret = 1;
1524
1525         setup_git_directory_gently(&nongit);
1526         if (argc < 2) {
1527                 error(_("remote-curl: usage: git remote-curl <remote> [<url>]"));
1528                 goto cleanup;
1529         }
1530
1531         options.verbosity = 1;
1532         options.progress = !!isatty(2);
1533         options.thin = 1;
1534         string_list_init_dup(&options.deepen_not);
1535         string_list_init_dup(&options.push_options);
1536
1537         /*
1538          * Just report "remote-curl" here (folding all the various aliases
1539          * ("git-remote-http", "git-remote-https", and etc.) here since they
1540          * are all just copies of the same actual executable.
1541          */
1542         trace2_cmd_name("remote-curl");
1543
1544         remote = remote_get(argv[1]);
1545
1546         if (argc > 2) {
1547                 end_url_with_slash(&url, argv[2]);
1548         } else {
1549                 end_url_with_slash(&url, remote->url[0]);
1550         }
1551
1552         http_init(remote, url.buf, 0);
1553
1554         do {
1555                 const char *arg;
1556
1557                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1558                         if (ferror(stdin))
1559                                 error(_("remote-curl: error reading command stream from git"));
1560                         goto cleanup;
1561                 }
1562                 if (buf.len == 0)
1563                         break;
1564                 if (starts_with(buf.buf, "fetch ")) {
1565                         if (nongit)
1566                                 die(_("remote-curl: fetch attempted without a local repo"));
1567                         parse_fetch(&buf);
1568
1569                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1570                         int for_push = !!strstr(buf.buf + 4, "for-push");
1571                         output_refs(get_refs(for_push));
1572
1573                 } else if (starts_with(buf.buf, "push ")) {
1574                         parse_push(&buf);
1575
1576                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1577                         char *value = strchr(arg, ' ');
1578                         int result;
1579
1580                         if (value)
1581                                 *value++ = '\0';
1582                         else
1583                                 value = "true";
1584
1585                         result = set_option(arg, value);
1586                         if (!result)
1587                                 printf("ok\n");
1588                         else if (result < 0)
1589                                 printf("error invalid value\n");
1590                         else
1591                                 printf("unsupported\n");
1592                         fflush(stdout);
1593
1594                 } else if (skip_prefix(buf.buf, "get ", &arg)) {
1595                         parse_get(arg);
1596                         fflush(stdout);
1597
1598                 } else if (!strcmp(buf.buf, "capabilities")) {
1599                         printf("stateless-connect\n");
1600                         printf("fetch\n");
1601                         printf("get\n");
1602                         printf("option\n");
1603                         printf("push\n");
1604                         printf("check-connectivity\n");
1605                         printf("object-format\n");
1606                         printf("\n");
1607                         fflush(stdout);
1608                 } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1609                         if (!stateless_connect(arg))
1610                                 break;
1611                 } else {
1612                         error(_("remote-curl: unknown command '%s' from git"), buf.buf);
1613                         goto cleanup;
1614                 }
1615                 strbuf_reset(&buf);
1616         } while (1);
1617
1618         http_cleanup();
1619         ret = 0;
1620 cleanup:
1621         strbuf_release(&buf);
1622
1623         return ret;
1624 }