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 "trace2.h"
  25 #include "transport.h"
  26 #include "write-or-die.h"
  27
  28 static struct remote *remote;
  29 /* always ends with a trailing slash */
  30 static struct strbuf url = STRBUF_INIT;
  31
  32 struct options {
  33         int verbosity;
  34         unsigned long depth;
  35         char *deepen_since;
  36         struct string_list deepen_not;
  37         struct string_list push_options;
  38         char *filter;
  39         unsigned progress : 1,
  40                 check_self_contained_and_connected : 1,
  41                 cloning : 1,
  42                 update_shallow : 1,
  43                 followtags : 1,
  44                 dry_run : 1,
  45                 thin : 1,
  46                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
  47                 push_cert : 2,
  48                 deepen_relative : 1,
  49
  50                 /* see documentation of corresponding flag in fetch-pack.h */
  51                 from_promisor : 1,
  52
  53                 refetch : 1,
  54                 atomic : 1,
  55                 object_format : 1,
  56                 force_if_includes : 1;
  57         const struct git_hash_algo *hash_algo;
  58 };
  59 static struct options options;
  60 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  61
  62 static int set_option(const char *name, const char *value)
  63 {
  64         if (!strcmp(name, "verbosity")) {
  65                 char *end;
  66                 int v = strtol(value, &end, 10);
  67                 if (value == end || *end)
  68                         return -1;
  69                 options.verbosity = v;
  70                 return 0;
  71         }
  72         else if (!strcmp(name, "progress")) {
  73                 if (!strcmp(value, "true"))
  74                         options.progress = 1;
  75                 else if (!strcmp(value, "false"))
  76                         options.progress = 0;
  77                 else
  78                         return -1;
  79                 return 0;
  80         }
  81         else if (!strcmp(name, "depth")) {
  82                 char *end;
  83                 unsigned long v = strtoul(value, &end, 10);
  84                 if (value == end || *end)
  85                         return -1;
  86                 options.depth = v;
  87                 return 0;
  88         }
  89         else if (!strcmp(name, "deepen-since")) {
  90                 options.deepen_since = xstrdup(value);
  91                 return 0;
  92         }
  93         else if (!strcmp(name, "deepen-not")) {
  94                 string_list_append(&options.deepen_not, value);
  95                 return 0;
  96         }
  97         else if (!strcmp(name, "deepen-relative")) {
  98                 if (!strcmp(value, "true"))
  99                         options.deepen_relative = 1;
 100                 else if (!strcmp(value, "false"))
 101                         options.deepen_relative = 0;
 102                 else
 103                         return -1;
 104                 return 0;
 105         }
 106         else if (!strcmp(name, "followtags")) {
 107                 if (!strcmp(value, "true"))
 108                         options.followtags = 1;
 109                 else if (!strcmp(value, "false"))
 110                         options.followtags = 0;
 111                 else
 112                         return -1;
 113                 return 0;
 114         }
 115         else if (!strcmp(name, "dry-run")) {
 116                 if (!strcmp(value, "true"))
 117                         options.dry_run = 1;
 118                 else if (!strcmp(value, "false"))
 119                         options.dry_run = 0;
 120                 else
 121                         return -1;
 122                 return 0;
 123         }
 124         else if (!strcmp(name, "check-connectivity")) {
 125                 if (!strcmp(value, "true"))
 126                         options.check_self_contained_and_connected = 1;
 127                 else if (!strcmp(value, "false"))
 128                         options.check_self_contained_and_connected = 0;
 129                 else
 130                         return -1;
 131                 return 0;
 132         }
 133         else if (!strcmp(name, "cas")) {
 134                 struct strbuf val = STRBUF_INIT;
 135                 strbuf_addstr(&val, "--force-with-lease=");
 136                 if (*value != '"')
 137                         strbuf_addstr(&val, value);
 138                 else if (unquote_c_style(&val, value, NULL))
 139                         return -1;
 140                 string_list_append(&cas_options, val.buf);
 141                 strbuf_release(&val);
 142                 return 0;
 143         } else if (!strcmp(name, TRANS_OPT_FORCE_IF_INCLUDES)) {
 144                 if (!strcmp(value, "true"))
 145                         options.force_if_includes = 1;
 146                 else if (!strcmp(value, "false"))
 147                         options.force_if_includes = 0;
 148                 else
 149                         return -1;
 150                 return 0;
 151         } else if (!strcmp(name, "cloning")) {
 152                 if (!strcmp(value, "true"))
 153                         options.cloning = 1;
 154                 else if (!strcmp(value, "false"))
 155                         options.cloning = 0;
 156                 else
 157                         return -1;
 158                 return 0;
 159         } else if (!strcmp(name, "update-shallow")) {
 160                 if (!strcmp(value, "true"))
 161                         options.update_shallow = 1;
 162                 else if (!strcmp(value, "false"))
 163                         options.update_shallow = 0;
 164                 else
 165                         return -1;
 166                 return 0;
 167         } else if (!strcmp(name, "pushcert")) {
 168                 if (!strcmp(value, "true"))
 169                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 170                 else if (!strcmp(value, "false"))
 171                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 172                 else if (!strcmp(value, "if-asked"))
 173                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 174                 else
 175                         return -1;
 176                 return 0;
 177         } else if (!strcmp(name, "atomic")) {
 178                 if (!strcmp(value, "true"))
 179                         options.atomic = 1;
 180                 else if (!strcmp(value, "false"))
 181                         options.atomic = 0;
 182                 else
 183                         return -1;
 184                 return 0;
 185         } else if (!strcmp(name, "push-option")) {
 186                 if (*value != '"')
 187                         string_list_append(&options.push_options, value);
 188                 else {
 189                         struct strbuf unquoted = STRBUF_INIT;
 190                         if (unquote_c_style(&unquoted, value, NULL) < 0)
 191                                 die(_("invalid quoting in push-option value: '%s'"), value);
 192                         string_list_append_nodup(&options.push_options,
 193                                                  strbuf_detach(&unquoted, NULL));
 194                 }
 195                 return 0;
 196         } else if (!strcmp(name, "family")) {
 197                 if (!strcmp(value, "ipv4"))
 198                         git_curl_ipresolve = CURL_IPRESOLVE_V4;
 199                 else if (!strcmp(value, "ipv6"))
 200                         git_curl_ipresolve = CURL_IPRESOLVE_V6;
 201                 else if (!strcmp(value, "all"))
 202                         git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 203                 else
 204                         return -1;
 205                 return 0;
 206         } else if (!strcmp(name, "from-promisor")) {
 207                 options.from_promisor = 1;
 208                 return 0;
 209         } else if (!strcmp(name, "refetch")) {
 210                 options.refetch = 1;
 211                 return 0;
 212         } else if (!strcmp(name, "filter")) {
 213                 options.filter = xstrdup(value);
 214                 return 0;
 215         } else if (!strcmp(name, "object-format")) {
 216                 int algo;
 217                 options.object_format = 1;
 218                 if (strcmp(value, "true")) {
 219                         algo = hash_algo_by_name(value);
 220                         if (algo == GIT_HASH_UNKNOWN)
 221                                 die("unknown object format '%s'", value);
 222                         options.hash_algo = &hash_algos[algo];
 223                 }
 224                 return 0;
 225         } else {
 226                 return 1 /* unsupported */;
 227         }
 228 }
 229
 230 struct discovery {
 231         char *service;
 232         char *buf_alloc;
 233         char *buf;
 234         size_t len;
 235         struct ref *refs;
 236         struct oid_array shallow;
 237         enum protocol_version version;
 238         unsigned proto_git : 1;
 239 };
 240 static struct discovery *last_discovery;
 241
 242 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 243 {
 244         struct ref *list = NULL;
 245         struct packet_reader reader;
 246
 247         packet_reader_init(&reader, -1, heads->buf, heads->len,
 248                            PACKET_READ_CHOMP_NEWLINE |
 249                            PACKET_READ_GENTLE_ON_EOF |
 250                            PACKET_READ_DIE_ON_ERR_PACKET);
 251
 252         heads->version = discover_version(&reader);
 253         switch (heads->version) {
 254         case protocol_v2:
 255                 /*
 256                  * Do nothing.  This isn't a list of refs but rather a
 257                  * capability advertisement.  Client would have run
 258                  * 'stateless-connect' so we'll dump this capability listing
 259                  * and let them request the refs themselves.
 260                  */
 261                 break;
 262         case protocol_v1:
 263         case protocol_v0:
 264                 get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
 265                                  NULL, &heads->shallow);
 266                 options.hash_algo = reader.hash_algo;
 267                 break;
 268         case protocol_unknown_version:
 269                 BUG("unknown protocol version");
 270         }
 271
 272         return list;
 273 }
 274
 275 static const struct git_hash_algo *detect_hash_algo(struct discovery *heads)
 276 {
 277         const char *p = memchr(heads->buf, '\t', heads->len);
 278         int algo;
 279         if (!p)
 280                 return the_hash_algo;
 281
 282         algo = hash_algo_by_length((p - heads->buf) / 2);
 283         if (algo == GIT_HASH_UNKNOWN)
 284                 return NULL;
 285         return &hash_algos[algo];
 286 }
 287
 288 static struct ref *parse_info_refs(struct discovery *heads)
 289 {
 290         char *data, *start, *mid;
 291         char *ref_name;
 292         int i = 0;
 293
 294         struct ref *refs = NULL;
 295         struct ref *ref = NULL;
 296         struct ref *last_ref = NULL;
 297
 298         options.hash_algo = detect_hash_algo(heads);
 299         if (!options.hash_algo)
 300                 die("%sinfo/refs not valid: could not determine hash algorithm; "
 301                     "is this a git repository?",
 302                     transport_anonymize_url(url.buf));
 303
 304         data = heads->buf;
 305         start = NULL;
 306         mid = data;
 307         while (i < heads->len) {
 308                 if (!start) {
 309                         start = &data[i];
 310                 }
 311                 if (data[i] == '\t')
 312                         mid = &data[i];
 313                 if (data[i] == '\n') {
 314                         if (mid - start != options.hash_algo->hexsz)
 315                                 die(_("%sinfo/refs not valid: is this a git repository?"),
 316                                     transport_anonymize_url(url.buf));
 317                         data[i] = 0;
 318                         ref_name = mid + 1;
 319                         ref = alloc_ref(ref_name);
 320                         get_oid_hex_algop(start, &ref->old_oid, options.hash_algo);
 321                         if (!refs)
 322                                 refs = ref;
 323                         if (last_ref)
 324                                 last_ref->next = ref;
 325                         last_ref = ref;
 326                         start = NULL;
 327                 }
 328                 i++;
 329         }
 330
 331         ref = alloc_ref("HEAD");
 332         if (!http_fetch_ref(url.buf, ref) &&
 333             !resolve_remote_symref(ref, refs)) {
 334                 ref->next = refs;
 335                 refs = ref;
 336         } else {
 337                 free(ref);
 338         }
 339
 340         return refs;
 341 }
 342
 343 static void free_discovery(struct discovery *d)
 344 {
 345         if (d) {
 346                 if (d == last_discovery)
 347                         last_discovery = NULL;
 348                 free(d->shallow.oid);
 349                 free(d->buf_alloc);
 350                 free_refs(d->refs);
 351                 free(d->service);
 352                 free(d);
 353         }
 354 }
 355
 356 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 357                              struct strbuf *msg)
 358 {
 359         const char *p, *eol;
 360
 361         /*
 362          * We only show text/plain parts, as other types are likely
 363          * to be ugly to look at on the user's terminal.
 364          */
 365         if (strcmp(type->buf, "text/plain"))
 366                 return -1;
 367         if (charset->len)
 368                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 369
 370         strbuf_trim(msg);
 371         if (!msg->len)
 372                 return -1;
 373
 374         p = msg->buf;
 375         do {
 376                 eol = strchrnul(p, '\n');
 377                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 378                 p = eol + 1;
 379         } while(*eol);
 380         return 0;
 381 }
 382
 383 static int get_protocol_http_header(enum protocol_version version,
 384                                     struct strbuf *header)
 385 {
 386         if (version > 0) {
 387                 strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
 388                             version);
 389
 390                 return 1;
 391         }
 392
 393         return 0;
 394 }
 395
 396 static void check_smart_http(struct discovery *d, const char *service,
 397                              struct strbuf *type)
 398 {
 399         const char *p;
 400         struct packet_reader reader;
 401
 402         /*
 403          * If we don't see x-$service-advertisement, then it's not smart-http.
 404          * But once we do, we commit to it and assume any other protocol
 405          * violations are hard errors.
 406          */
 407         if (!skip_prefix(type->buf, "application/x-", &p) ||
 408             !skip_prefix(p, service, &p) ||
 409             strcmp(p, "-advertisement"))
 410                 return;
 411
 412         packet_reader_init(&reader, -1, d->buf, d->len,
 413                            PACKET_READ_CHOMP_NEWLINE |
 414                            PACKET_READ_DIE_ON_ERR_PACKET);
 415         if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
 416                 die(_("invalid server response; expected service, got flush packet"));
 417
 418         if (skip_prefix(reader.line, "# service=", &p) && !strcmp(p, service)) {
 419                 /*
 420                  * The header can include additional metadata lines, up
 421                  * until a packet flush marker.  Ignore these now, but
 422                  * in the future we might start to scan them.
 423                  */
 424                 for (;;) {
 425                         packet_reader_read(&reader);
 426                         if (reader.pktlen <= 0) {
 427                                 break;
 428                         }
 429                 }
 430
 431                 /*
 432                  * v0 smart http; callers expect us to soak up the
 433                  * service and header packets
 434                  */
 435                 d->buf = reader.src_buffer;
 436                 d->len = reader.src_len;
 437                 d->proto_git = 1;
 438
 439         } else if (!strcmp(reader.line, "version 2")) {
 440                 /*
 441                  * v2 smart http; do not consume version packet, which will
 442                  * be handled elsewhere.
 443                  */
 444                 d->proto_git = 1;
 445
 446         } else {
 447                 die(_("invalid server response; got '%s'"), reader.line);
 448         }
 449 }
 450
 451 static struct discovery *discover_refs(const char *service, int for_push)
 452 {
 453         struct strbuf type = STRBUF_INIT;
 454         struct strbuf charset = STRBUF_INIT;
 455         struct strbuf buffer = STRBUF_INIT;
 456         struct strbuf refs_url = STRBUF_INIT;
 457         struct strbuf effective_url = STRBUF_INIT;
 458         struct strbuf protocol_header = STRBUF_INIT;
 459         struct string_list extra_headers = STRING_LIST_INIT_DUP;
 460         struct discovery *last = last_discovery;
 461         int http_ret, maybe_smart = 0;
 462         struct http_get_options http_options;
 463         enum protocol_version version = get_protocol_version_config();
 464
 465         if (last && !strcmp(service, last->service))
 466                 return last;
 467         free_discovery(last);
 468
 469         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 470         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 471              git_env_bool("GIT_SMART_HTTP", 1)) {
 472                 maybe_smart = 1;
 473                 if (!strchr(url.buf, '?'))
 474                         strbuf_addch(&refs_url, '?');
 475                 else
 476                         strbuf_addch(&refs_url, '&');
 477                 strbuf_addf(&refs_url, "service=%s", service);
 478         }
 479
 480         /*
 481          * NEEDSWORK: If we are trying to use protocol v2 and we are planning
 482          * to perform any operation that doesn't involve upload-pack (i.e., a
 483          * fetch, ls-remote, etc), then fallback to v0 since we don't know how
 484          * to do anything else (like push or remote archive) via v2.
 485          */
 486         if (version == protocol_v2 && strcmp("git-upload-pack", service))
 487                 version = protocol_v0;
 488
 489         /* Add the extra Git-Protocol header */
 490         if (get_protocol_http_header(version, &protocol_header))
 491                 string_list_append(&extra_headers, protocol_header.buf);
 492
 493         memset(&http_options, 0, sizeof(http_options));
 494         http_options.content_type = &type;
 495         http_options.charset = &charset;
 496         http_options.effective_url = &effective_url;
 497         http_options.base_url = &url;
 498         http_options.extra_headers = &extra_headers;
 499         http_options.initial_request = 1;
 500         http_options.no_cache = 1;
 501
 502         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 503         switch (http_ret) {
 504         case HTTP_OK:
 505                 break;
 506         case HTTP_MISSING_TARGET:
 507                 show_http_message(&type, &charset, &buffer);
 508                 die(_("repository '%s' not found"),
 509                     transport_anonymize_url(url.buf));
 510         case HTTP_NOAUTH:
 511                 show_http_message(&type, &charset, &buffer);
 512                 die(_("Authentication failed for '%s'"),
 513                     transport_anonymize_url(url.buf));
 514         case HTTP_NOMATCHPUBLICKEY:
 515                 show_http_message(&type, &charset, &buffer);
 516                 die(_("unable to access '%s' with http.pinnedPubkey configuration: %s"),
 517                     transport_anonymize_url(url.buf), curl_errorstr);
 518         default:
 519                 show_http_message(&type, &charset, &buffer);
 520                 die(_("unable to access '%s': %s"),
 521                     transport_anonymize_url(url.buf), curl_errorstr);
 522         }
 523
 524         if (options.verbosity && !starts_with(refs_url.buf, url.buf)) {
 525                 char *u = transport_anonymize_url(url.buf);
 526                 warning(_("redirecting to %s"), u);
 527                 free(u);
 528         }
 529
 530         last= xcalloc(1, sizeof(*last_discovery));
 531         last->service = xstrdup(service);
 532         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 533         last->buf = last->buf_alloc;
 534
 535         if (maybe_smart)
 536                 check_smart_http(last, service, &type);
 537
 538         if (last->proto_git)
 539                 last->refs = parse_git_refs(last, for_push);
 540         else
 541                 last->refs = parse_info_refs(last);
 542
 543         strbuf_release(&refs_url);
 544         strbuf_release(&type);
 545         strbuf_release(&charset);
 546         strbuf_release(&effective_url);
 547         strbuf_release(&buffer);
 548         strbuf_release(&protocol_header);
 549         string_list_clear(&extra_headers, 0);
 550         last_discovery = last;
 551         return last;
 552 }
 553
 554 static struct ref *get_refs(int for_push)
 555 {
 556         struct discovery *heads;
 557
 558         if (for_push)
 559                 heads = discover_refs("git-receive-pack", for_push);
 560         else
 561                 heads = discover_refs("git-upload-pack", for_push);
 562
 563         return heads->refs;
 564 }
 565
 566 static void output_refs(struct ref *refs)
 567 {
 568         struct ref *posn;
 569         if (options.object_format && options.hash_algo) {
 570                 printf(":object-format %s\n", options.hash_algo->name);
 571                 repo_set_hash_algo(the_repository,
 572                                 hash_algo_by_ptr(options.hash_algo));
 573         }
 574         for (posn = refs; posn; posn = posn->next) {
 575                 if (posn->symref)
 576                         printf("@%s %s\n", posn->symref, posn->name);
 577                 else
 578                         printf("%s %s\n", hash_to_hex_algop(posn->old_oid.hash,
 579                                                             options.hash_algo),
 580                                           posn->name);
 581         }
 582         printf("\n");
 583         fflush(stdout);
 584 }
 585
 586 struct rpc_state {
 587         const char *service_name;
 588         char *service_url;
 589         char *hdr_content_type;
 590         char *hdr_accept;
 591         char *hdr_accept_language;
 592         char *protocol_header;
 593         char *buf;
 594         size_t alloc;
 595         size_t len;
 596         size_t pos;
 597         int in;
 598         int out;
 599         int any_written;
 600         unsigned gzip_request : 1;
 601         unsigned initial_buffer : 1;
 602
 603         /*
 604          * Whenever a pkt-line is read into buf, append the 4 characters
 605          * denoting its length before appending the payload.
 606          */
 607         unsigned write_line_lengths : 1;
 608
 609         /*
 610          * Used by rpc_out; initialize to 0. This is true if a flush has been
 611          * read, but the corresponding line length (if write_line_lengths is
 612          * true) and EOF have not been sent to libcurl. Since each flush marks
 613          * the end of a request, each flush must be completely sent before any
 614          * further reading occurs.
 615          */
 616         unsigned flush_read_but_not_sent : 1;
 617 };
 618
 619 #define RPC_STATE_INIT { 0 }
 620
 621 /*
 622  * Appends the result of reading from rpc->out to the string represented by
 623  * rpc->buf and rpc->len if there is enough space. Returns 1 if there was
 624  * enough space, 0 otherwise.
 625  *
 626  * If rpc->write_line_lengths is true, appends the line length as a 4-byte
 627  * hexadecimal string before appending the result described above.
 628  *
 629  * Writes the total number of bytes appended into appended.
 630  */
 631 static int rpc_read_from_out(struct rpc_state *rpc, int options,
 632                              size_t *appended,
 633                              enum packet_read_status *status) {
 634         size_t left;
 635         char *buf;
 636         int pktlen_raw;
 637
 638         if (rpc->write_line_lengths) {
 639                 left = rpc->alloc - rpc->len - 4;
 640                 buf = rpc->buf + rpc->len + 4;
 641         } else {
 642                 left = rpc->alloc - rpc->len;
 643                 buf = rpc->buf + rpc->len;
 644         }
 645
 646         if (left < LARGE_PACKET_MAX)
 647                 return 0;
 648
 649         *status = packet_read_with_status(rpc->out, NULL, NULL, buf,
 650                         left, &pktlen_raw, options);
 651         if (*status != PACKET_READ_EOF) {
 652                 *appended = pktlen_raw + (rpc->write_line_lengths ? 4 : 0);
 653                 rpc->len += *appended;
 654         }
 655
 656         if (rpc->write_line_lengths) {
 657                 switch (*status) {
 658                 case PACKET_READ_EOF:
 659                         if (!(options & PACKET_READ_GENTLE_ON_EOF))
 660                                 die(_("shouldn't have EOF when not gentle on EOF"));
 661                         break;
 662                 case PACKET_READ_NORMAL:
 663                         set_packet_header(buf - 4, *appended);
 664                         break;
 665                 case PACKET_READ_DELIM:
 666                         memcpy(buf - 4, "0001", 4);
 667                         break;
 668                 case PACKET_READ_FLUSH:
 669                         memcpy(buf - 4, "0000", 4);
 670                         break;
 671                 case PACKET_READ_RESPONSE_END:
 672                         die(_("remote server sent unexpected response end packet"));
 673                 }
 674         }
 675
 676         return 1;
 677 }
 678
 679 static size_t rpc_out(void *ptr, size_t eltsize,
 680                 size_t nmemb, void *buffer_)
 681 {
 682         size_t max = eltsize * nmemb;
 683         struct rpc_state *rpc = buffer_;
 684         size_t avail = rpc->len - rpc->pos;
 685         enum packet_read_status status;
 686
 687         if (!avail) {
 688                 rpc->initial_buffer = 0;
 689                 rpc->len = 0;
 690                 rpc->pos = 0;
 691                 if (!rpc->flush_read_but_not_sent) {
 692                         if (!rpc_read_from_out(rpc, 0, &avail, &status))
 693                                 BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
 694                         if (status == PACKET_READ_FLUSH)
 695                                 rpc->flush_read_but_not_sent = 1;
 696                 }
 697                 /*
 698                  * If flush_read_but_not_sent is true, we have already read one
 699                  * full request but have not fully sent it + EOF, which is why
 700                  * we need to refrain from reading.
 701                  */
 702         }
 703         if (rpc->flush_read_but_not_sent) {
 704                 if (!avail) {
 705                         /*
 706                          * The line length either does not need to be sent at
 707                          * all or has already been completely sent. Now we can
 708                          * return 0, indicating EOF, meaning that the flush has
 709                          * been fully sent.
 710                          */
 711                         rpc->flush_read_but_not_sent = 0;
 712                         return 0;
 713                 }
 714                 /*
 715                  * If avail is non-zero, the line length for the flush still
 716                  * hasn't been fully sent. Proceed with sending the line
 717                  * length.
 718                  */
 719         }
 720
 721         if (max < avail)
 722                 avail = max;
 723         memcpy(ptr, rpc->buf + rpc->pos, avail);
 724         rpc->pos += avail;
 725         return avail;
 726 }
 727
 728 static int rpc_seek(void *clientp, curl_off_t offset, int origin)
 729 {
 730         struct rpc_state *rpc = clientp;
 731
 732         if (origin != SEEK_SET)
 733                 BUG("rpc_seek only handles SEEK_SET, not %d", origin);
 734
 735         if (rpc->initial_buffer) {
 736                 if (offset < 0 || offset > rpc->len) {
 737                         error("curl seek would be outside of rpc buffer");
 738                         return CURL_SEEKFUNC_FAIL;
 739                 }
 740                 rpc->pos = offset;
 741                 return CURL_SEEKFUNC_OK;
 742         }
 743         error(_("unable to rewind rpc post data - try increasing http.postBuffer"));
 744         return CURL_SEEKFUNC_FAIL;
 745 }
 746
 747 struct check_pktline_state {
 748         char len_buf[4];
 749         int len_filled;
 750         int remaining;
 751 };
 752
 753 static void check_pktline(struct check_pktline_state *state, const char *ptr, size_t size)
 754 {
 755         while (size) {
 756                 if (!state->remaining) {
 757                         int digits_remaining = 4 - state->len_filled;
 758                         if (digits_remaining > size)
 759                                 digits_remaining = size;
 760                         memcpy(&state->len_buf[state->len_filled], ptr, digits_remaining);
 761                         state->len_filled += digits_remaining;
 762                         ptr += digits_remaining;
 763                         size -= digits_remaining;
 764
 765                         if (state->len_filled == 4) {
 766                                 state->remaining = packet_length(state->len_buf);
 767                                 if (state->remaining < 0) {
 768                                         die(_("remote-curl: bad line length character: %.4s"), state->len_buf);
 769                                 } else if (state->remaining == 2) {
 770                                         die(_("remote-curl: unexpected response end packet"));
 771                                 } else if (state->remaining < 4) {
 772                                         state->remaining = 0;
 773                                 } else {
 774                                         state->remaining -= 4;
 775                                 }
 776                                 state->len_filled = 0;
 777                         }
 778                 }
 779
 780                 if (state->remaining) {
 781                         int remaining = state->remaining;
 782                         if (remaining > size)
 783                                 remaining = size;
 784                         ptr += remaining;
 785                         size -= remaining;
 786                         state->remaining -= remaining;
 787                 }
 788         }
 789 }
 790
 791 struct rpc_in_data {
 792         struct rpc_state *rpc;
 793         struct active_request_slot *slot;
 794         int check_pktline;
 795         struct check_pktline_state pktline_state;
 796 };
 797
 798 /*
 799  * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
 800  * from ptr.
 801  */
 802 static size_t rpc_in(char *ptr, size_t eltsize,
 803                 size_t nmemb, void *buffer_)
 804 {
 805         size_t size = eltsize * nmemb;
 806         struct rpc_in_data *data = buffer_;
 807         long response_code;
 808
 809         if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
 810                               &response_code) != CURLE_OK)
 811                 return size;
 812         if (response_code >= 300)
 813                 return size;
 814         if (size)
 815                 data->rpc->any_written = 1;
 816         if (data->check_pktline)
 817                 check_pktline(&data->pktline_state, ptr, size);
 818         write_or_die(data->rpc->in, ptr, size);
 819         return size;
 820 }
 821
 822 static int run_slot(struct active_request_slot *slot,
 823                     struct slot_results *results)
 824 {
 825         int err;
 826         struct slot_results results_buf;
 827
 828         if (!results)
 829                 results = &results_buf;
 830
 831         err = run_one_slot(slot, results);
 832
 833         if (err != HTTP_OK && err != HTTP_REAUTH) {
 834                 struct strbuf msg = STRBUF_INIT;
 835                 if (results->http_code && results->http_code != 200)
 836                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 837                 if (results->curl_result != CURLE_OK) {
 838                         if (msg.len)
 839                                 strbuf_addch(&msg, ' ');
 840                         strbuf_addf(&msg, "curl %d", results->curl_result);
 841                         if (curl_errorstr[0]) {
 842                                 strbuf_addch(&msg, ' ');
 843                                 strbuf_addstr(&msg, curl_errorstr);
 844                         }
 845                 }
 846                 error(_("RPC failed; %s"), msg.buf);
 847                 strbuf_release(&msg);
 848         }
 849
 850         return err;
 851 }
 852
 853 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 854 {
 855         struct active_request_slot *slot;
 856         struct curl_slist *headers = http_copy_default_headers();
 857         struct strbuf buf = STRBUF_INIT;
 858         int err;
 859
 860         slot = get_active_slot();
 861
 862         headers = curl_slist_append(headers, rpc->hdr_content_type);
 863         headers = curl_slist_append(headers, rpc->hdr_accept);
 864
 865         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 866         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 867         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 868         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 869         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 870         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 871         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 872         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 873         curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, &buf);
 874
 875         err = run_slot(slot, results);
 876
 877         curl_slist_free_all(headers);
 878         strbuf_release(&buf);
 879         return err;
 880 }
 881
 882 static curl_off_t xcurl_off_t(size_t len)
 883 {
 884         uintmax_t size = len;
 885         if (size > maximum_signed_value_of_type(curl_off_t))
 886                 die(_("cannot handle pushes this big"));
 887         return (curl_off_t)size;
 888 }
 889
 890 /*
 891  * If flush_received is true, do not attempt to read any more; just use what's
 892  * in rpc->buf.
 893  */
 894 static int post_rpc(struct rpc_state *rpc, int stateless_connect, int flush_received)
 895 {
 896         struct active_request_slot *slot;
 897         struct curl_slist *headers = http_copy_default_headers();
 898         int use_gzip = rpc->gzip_request;
 899         char *gzip_body = NULL;
 900         size_t gzip_size = 0;
 901         int err, large_request = 0;
 902         int needs_100_continue = 0;
 903         struct rpc_in_data rpc_in_data;
 904
 905         /* Try to load the entire request, if we can fit it into the
 906          * allocated buffer space we can use HTTP/1.0 and avoid the
 907          * chunked encoding mess.
 908          */
 909         if (!flush_received) {
 910                 while (1) {
 911                         size_t n;
 912                         enum packet_read_status status;
 913
 914                         if (!rpc_read_from_out(rpc, 0, &n, &status)) {
 915                                 large_request = 1;
 916                                 use_gzip = 0;
 917                                 break;
 918                         }
 919                         if (status == PACKET_READ_FLUSH)
 920                                 break;
 921                 }
 922         }
 923
 924         if (large_request) {
 925                 struct slot_results results;
 926
 927                 do {
 928                         err = probe_rpc(rpc, &results);
 929                         if (err == HTTP_REAUTH)
 930                                 credential_fill(&http_auth);
 931                 } while (err == HTTP_REAUTH);
 932                 if (err != HTTP_OK)
 933                         return -1;
 934
 935                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 936                         needs_100_continue = 1;
 937         }
 938
 939         headers = curl_slist_append(headers, rpc->hdr_content_type);
 940         headers = curl_slist_append(headers, rpc->hdr_accept);
 941         headers = curl_slist_append(headers, needs_100_continue ?
 942                 "Expect: 100-continue" : "Expect:");
 943
 944         /* Add Accept-Language header */
 945         if (rpc->hdr_accept_language)
 946                 headers = curl_slist_append(headers, rpc->hdr_accept_language);
 947
 948         /* Add the extra Git-Protocol header */
 949         if (rpc->protocol_header)
 950                 headers = curl_slist_append(headers, rpc->protocol_header);
 951
 952 retry:
 953         slot = get_active_slot();
 954
 955         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 956         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 957         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 958         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 959
 960         if (large_request) {
 961                 /* The request body is large and the size cannot be predicted.
 962                  * We must use chunked encoding to send it.
 963                  */
 964                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 965                 rpc->initial_buffer = 1;
 966                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 967                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 968                 curl_easy_setopt(slot->curl, CURLOPT_SEEKFUNCTION, rpc_seek);
 969                 curl_easy_setopt(slot->curl, CURLOPT_SEEKDATA, rpc);
 970                 if (options.verbosity > 1) {
 971                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 972                         fflush(stderr);
 973                 }
 974
 975         } else if (gzip_body) {
 976                 /*
 977                  * If we are looping to retry authentication, then the previous
 978                  * run will have set up the headers and gzip buffer already,
 979                  * and we just need to send it.
 980                  */
 981                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 982                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 983
 984         } else if (use_gzip && 1024 < rpc->len) {
 985                 /* The client backend isn't giving us compressed data so
 986                  * we can try to deflate it ourselves, this may save on
 987                  * the transfer time.
 988                  */
 989                 git_zstream stream;
 990                 int ret;
 991
 992                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 993                 gzip_size = git_deflate_bound(&stream, rpc->len);
 994                 gzip_body = xmalloc(gzip_size);
 995
 996                 stream.next_in = (unsigned char *)rpc->buf;
 997                 stream.avail_in = rpc->len;
 998                 stream.next_out = (unsigned char *)gzip_body;
 999                 stream.avail_out = gzip_size;
1000
1001                 ret = git_deflate(&stream, Z_FINISH);
1002                 if (ret != Z_STREAM_END)
1003                         die(_("cannot deflate request; zlib deflate error %d"), ret);
1004
1005                 ret = git_deflate_end_gently(&stream);
1006                 if (ret != Z_OK)
1007                         die(_("cannot deflate request; zlib end error %d"), ret);
1008
1009                 gzip_size = stream.total_out;
1010
1011                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
1012                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
1013                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
1014
1015                 if (options.verbosity > 1) {
1016                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
1017                                 rpc->service_name,
1018                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
1019                         fflush(stderr);
1020                 }
1021         } else {
1022                 /* We know the complete request size in advance, use the
1023                  * more normal Content-Length approach.
1024                  */
1025                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
1026                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
1027                 if (options.verbosity > 1) {
1028                         fprintf(stderr, "POST %s (%lu bytes)\n",
1029                                 rpc->service_name, (unsigned long)rpc->len);
1030                         fflush(stderr);
1031                 }
1032         }
1033
1034         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1035         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
1036         rpc_in_data.rpc = rpc;
1037         rpc_in_data.slot = slot;
1038         rpc_in_data.check_pktline = stateless_connect;
1039         memset(&rpc_in_data.pktline_state, 0, sizeof(rpc_in_data.pktline_state));
1040         curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, &rpc_in_data);
1041         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1042
1043
1044         rpc->any_written = 0;
1045         err = run_slot(slot, NULL);
1046         if (err == HTTP_REAUTH && !large_request) {
1047                 credential_fill(&http_auth);
1048                 goto retry;
1049         }
1050         if (err != HTTP_OK)
1051                 err = -1;
1052
1053         if (!rpc->any_written)
1054                 err = -1;
1055
1056         if (rpc_in_data.pktline_state.len_filled)
1057                 err = error(_("%d bytes of length header were received"), rpc_in_data.pktline_state.len_filled);
1058         if (rpc_in_data.pktline_state.remaining)
1059                 err = error(_("%d bytes of body are still expected"), rpc_in_data.pktline_state.remaining);
1060
1061         if (stateless_connect)
1062                 packet_response_end(rpc->in);
1063
1064         curl_slist_free_all(headers);
1065         free(gzip_body);
1066         return err;
1067 }
1068
1069 static int rpc_service(struct rpc_state *rpc, struct discovery *heads,
1070                        const char **client_argv, const struct strbuf *preamble,
1071                        struct strbuf *rpc_result)
1072 {
1073         const char *svc = rpc->service_name;
1074         struct strbuf buf = STRBUF_INIT;
1075         struct child_process client = CHILD_PROCESS_INIT;
1076         int err = 0;
1077
1078         client.in = -1;
1079         client.out = -1;
1080         client.git_cmd = 1;
1081         strvec_pushv(&client.args, client_argv);
1082         if (start_command(&client))
1083                 exit(1);
1084         write_or_die(client.in, preamble->buf, preamble->len);
1085         if (heads)
1086                 write_or_die(client.in, heads->buf, heads->len);
1087
1088         rpc->alloc = http_post_buffer;
1089         rpc->buf = xmalloc(rpc->alloc);
1090         rpc->in = client.in;
1091         rpc->out = client.out;
1092
1093         strbuf_addf(&buf, "%s%s", url.buf, svc);
1094         rpc->service_url = strbuf_detach(&buf, NULL);
1095
1096         rpc->hdr_accept_language = xstrdup_or_null(http_get_accept_language_header());
1097
1098         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
1099         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
1100
1101         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
1102         rpc->hdr_accept = strbuf_detach(&buf, NULL);
1103
1104         if (get_protocol_http_header(heads->version, &buf))
1105                 rpc->protocol_header = strbuf_detach(&buf, NULL);
1106         else
1107                 rpc->protocol_header = NULL;
1108
1109         while (!err) {
1110                 int n = packet_read(rpc->out, rpc->buf, rpc->alloc, 0);
1111                 if (!n)
1112                         break;
1113                 rpc->pos = 0;
1114                 rpc->len = n;
1115                 err |= post_rpc(rpc, 0, 0);
1116         }
1117
1118         close(client.in);
1119         client.in = -1;
1120         if (!err) {
1121                 strbuf_read(rpc_result, client.out, 0);
1122         } else {
1123                 char buf[4096];
1124                 for (;;)
1125                         if (xread(client.out, buf, sizeof(buf)) <= 0)
1126                                 break;
1127         }
1128
1129         close(client.out);
1130         client.out = -1;
1131
1132         err |= finish_command(&client);
1133         free(rpc->service_url);
1134         free(rpc->hdr_content_type);
1135         free(rpc->hdr_accept);
1136         free(rpc->hdr_accept_language);
1137         free(rpc->protocol_header);
1138         free(rpc->buf);
1139         strbuf_release(&buf);
1140         return err;
1141 }
1142
1143 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
1144 {
1145         struct walker *walker;
1146         char **targets;
1147         int ret, i;
1148
1149         ALLOC_ARRAY(targets, nr_heads);
1150         if (options.depth || options.deepen_since)
1151                 die(_("dumb http transport does not support shallow capabilities"));
1152         for (i = 0; i < nr_heads; i++)
1153                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
1154
1155         walker = get_http_walker(url.buf);
1156         walker->get_verbosely = options.verbosity >= 3;
1157         walker->get_progress = options.progress;
1158         walker->get_recover = 0;
1159         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
1160         walker_free(walker);
1161
1162         for (i = 0; i < nr_heads; i++)
1163                 free(targets[i]);
1164         free(targets);
1165
1166         return ret ? error(_("fetch failed.")) : 0;
1167 }
1168
1169 static int fetch_git(struct discovery *heads,
1170         int nr_heads, struct ref **to_fetch)
1171 {
1172         struct rpc_state rpc = RPC_STATE_INIT;
1173         struct strbuf preamble = STRBUF_INIT;
1174         int i, err;
1175         struct strvec args = STRVEC_INIT;
1176         struct strbuf rpc_result = STRBUF_INIT;
1177
1178         strvec_pushl(&args, "fetch-pack", "--stateless-rpc",
1179                      "--stdin", "--lock-pack", NULL);
1180         if (options.followtags)
1181                 strvec_push(&args, "--include-tag");
1182         if (options.thin)
1183                 strvec_push(&args, "--thin");
1184         if (options.verbosity >= 3)
1185                 strvec_pushl(&args, "-v", "-v", NULL);
1186         if (options.check_self_contained_and_connected)
1187                 strvec_push(&args, "--check-self-contained-and-connected");
1188         if (options.cloning)
1189                 strvec_push(&args, "--cloning");
1190         if (options.update_shallow)
1191                 strvec_push(&args, "--update-shallow");
1192         if (!options.progress)
1193                 strvec_push(&args, "--no-progress");
1194         if (options.depth)
1195                 strvec_pushf(&args, "--depth=%lu", options.depth);
1196         if (options.deepen_since)
1197                 strvec_pushf(&args, "--shallow-since=%s", options.deepen_since);
1198         for (i = 0; i < options.deepen_not.nr; i++)
1199                 strvec_pushf(&args, "--shallow-exclude=%s",
1200                              options.deepen_not.items[i].string);
1201         if (options.deepen_relative && options.depth)
1202                 strvec_push(&args, "--deepen-relative");
1203         if (options.from_promisor)
1204                 strvec_push(&args, "--from-promisor");
1205         if (options.refetch)
1206                 strvec_push(&args, "--refetch");
1207         if (options.filter)
1208                 strvec_pushf(&args, "--filter=%s", options.filter);
1209         strvec_push(&args, url.buf);
1210
1211         for (i = 0; i < nr_heads; i++) {
1212                 struct ref *ref = to_fetch[i];
1213                 if (!*ref->name)
1214                         die(_("cannot fetch by sha1 over smart http"));
1215                 packet_buf_write(&preamble, "%s %s\n",
1216                                  oid_to_hex(&ref->old_oid), ref->name);
1217         }
1218         packet_buf_flush(&preamble);
1219
1220         memset(&rpc, 0, sizeof(rpc));
1221         rpc.service_name = "git-upload-pack",
1222         rpc.gzip_request = 1;
1223
1224         err = rpc_service(&rpc, heads, args.v, &preamble, &rpc_result);
1225         if (rpc_result.len)
1226                 write_or_die(1, rpc_result.buf, rpc_result.len);
1227         strbuf_release(&rpc_result);
1228         strbuf_release(&preamble);
1229         strvec_clear(&args);
1230         return err;
1231 }
1232
1233 static int fetch(int nr_heads, struct ref **to_fetch)
1234 {
1235         struct discovery *d = discover_refs("git-upload-pack", 0);
1236         if (d->proto_git)
1237                 return fetch_git(d, nr_heads, to_fetch);
1238         else
1239                 return fetch_dumb(nr_heads, to_fetch);
1240 }
1241
1242 static void parse_fetch(struct strbuf *buf)
1243 {
1244         struct ref **to_fetch = NULL;
1245         struct ref *list_head = NULL;
1246         struct ref **list = &list_head;
1247         int alloc_heads = 0, nr_heads = 0;
1248
1249         do {
1250                 const char *p;
1251                 if (skip_prefix(buf->buf, "fetch ", &p)) {
1252                         const char *name;
1253                         struct ref *ref;
1254                         struct object_id old_oid;
1255                         const char *q;
1256
1257                         if (parse_oid_hex(p, &old_oid, &q))
1258                                 die(_("protocol error: expected sha/ref, got '%s'"), p);
1259                         if (*q == ' ')
1260                                 name = q + 1;
1261                         else if (!*q)
1262                                 name = "";
1263                         else
1264                                 die(_("protocol error: expected sha/ref, got '%s'"), p);
1265
1266                         ref = alloc_ref(name);
1267                         oidcpy(&ref->old_oid, &old_oid);
1268
1269                         *list = ref;
1270                         list = &ref->next;
1271
1272                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1273                         to_fetch[nr_heads++] = ref;
1274                 }
1275                 else
1276                         die(_("http transport does not support %s"), buf->buf);
1277
1278                 strbuf_reset(buf);
1279                 if (strbuf_getline_lf(buf, stdin) == EOF)
1280                         return;
1281                 if (!*buf->buf)
1282                         break;
1283         } while (1);
1284
1285         if (fetch(nr_heads, to_fetch))
1286                 exit(128); /* error already reported */
1287         free_refs(list_head);
1288         free(to_fetch);
1289
1290         printf("\n");
1291         fflush(stdout);
1292         strbuf_reset(buf);
1293 }
1294
1295 static void parse_get(const char *arg)
1296 {
1297         struct strbuf url = STRBUF_INIT;
1298         struct strbuf path = STRBUF_INIT;
1299         const char *space;
1300
1301         space = strchr(arg, ' ');
1302
1303         if (!space)
1304                 die(_("protocol error: expected '<url> <path>', missing space"));
1305
1306         strbuf_add(&url, arg, space - arg);
1307         strbuf_addstr(&path, space + 1);
1308
1309         if (http_get_file(url.buf, path.buf, NULL))
1310                 die(_("failed to download file at URL '%s'"), url.buf);
1311
1312         strbuf_release(&url);
1313         strbuf_release(&path);
1314         printf("\n");
1315         fflush(stdout);
1316 }
1317
1318 static int push_dav(int nr_spec, const char **specs)
1319 {
1320         struct child_process child = CHILD_PROCESS_INIT;
1321         size_t i;
1322
1323         child.git_cmd = 1;
1324         strvec_push(&child.args, "http-push");
1325         strvec_push(&child.args, "--helper-status");
1326         if (options.dry_run)
1327                 strvec_push(&child.args, "--dry-run");
1328         if (options.verbosity > 1)
1329                 strvec_push(&child.args, "--verbose");
1330         strvec_push(&child.args, url.buf);
1331         for (i = 0; i < nr_spec; i++)
1332                 strvec_push(&child.args, specs[i]);
1333
1334         if (run_command(&child))
1335                 die(_("git-http-push failed"));
1336         return 0;
1337 }
1338
1339 static int push_git(struct discovery *heads, int nr_spec, const char **specs)
1340 {
1341         struct rpc_state rpc = RPC_STATE_INIT;
1342         int i, err;
1343         struct strvec args;
1344         struct string_list_item *cas_option;
1345         struct strbuf preamble = STRBUF_INIT;
1346         struct strbuf rpc_result = STRBUF_INIT;
1347
1348         strvec_init(&args);
1349         strvec_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1350                      NULL);
1351
1352         if (options.thin)
1353                 strvec_push(&args, "--thin");
1354         if (options.dry_run)
1355                 strvec_push(&args, "--dry-run");
1356         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1357                 strvec_push(&args, "--signed=yes");
1358         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1359                 strvec_push(&args, "--signed=if-asked");
1360         if (options.atomic)
1361                 strvec_push(&args, "--atomic");
1362         if (options.verbosity == 0)
1363                 strvec_push(&args, "--quiet");
1364         else if (options.verbosity > 1)
1365                 strvec_push(&args, "--verbose");
1366         for (i = 0; i < options.push_options.nr; i++)
1367                 strvec_pushf(&args, "--push-option=%s",
1368                              options.push_options.items[i].string);
1369         strvec_push(&args, options.progress ? "--progress" : "--no-progress");
1370         for_each_string_list_item(cas_option, &cas_options)
1371                 strvec_push(&args, cas_option->string);
1372         strvec_push(&args, url.buf);
1373
1374         if (options.force_if_includes)
1375                 strvec_push(&args, "--force-if-includes");
1376
1377         strvec_push(&args, "--stdin");
1378         for (i = 0; i < nr_spec; i++)
1379                 packet_buf_write(&preamble, "%s\n", specs[i]);
1380         packet_buf_flush(&preamble);
1381
1382         memset(&rpc, 0, sizeof(rpc));
1383         rpc.service_name = "git-receive-pack",
1384
1385         err = rpc_service(&rpc, heads, args.v, &preamble, &rpc_result);
1386         if (rpc_result.len)
1387                 write_or_die(1, rpc_result.buf, rpc_result.len);
1388         strbuf_release(&rpc_result);
1389         strbuf_release(&preamble);
1390         strvec_clear(&args);
1391         return err;
1392 }
1393
1394 static int push(int nr_spec, const char **specs)
1395 {
1396         struct discovery *heads = discover_refs("git-receive-pack", 1);
1397         int ret;
1398
1399         if (heads->proto_git)
1400                 ret = push_git(heads, nr_spec, specs);
1401         else
1402                 ret = push_dav(nr_spec, specs);
1403         free_discovery(heads);
1404         return ret;
1405 }
1406
1407 static void parse_push(struct strbuf *buf)
1408 {
1409         struct strvec specs = STRVEC_INIT;
1410         int ret;
1411
1412         do {
1413                 const char *arg;
1414                 if (skip_prefix(buf->buf, "push ", &arg))
1415                         strvec_push(&specs, arg);
1416                 else
1417                         die(_("http transport does not support %s"), buf->buf);
1418
1419                 strbuf_reset(buf);
1420                 if (strbuf_getline_lf(buf, stdin) == EOF)
1421                         goto free_specs;
1422                 if (!*buf->buf)
1423                         break;
1424         } while (1);
1425
1426         ret = push(specs.nr, specs.v);
1427         printf("\n");
1428         fflush(stdout);
1429
1430         if (ret)
1431                 exit(128); /* error already reported */
1432
1433 free_specs:
1434         strvec_clear(&specs);
1435 }
1436
1437 static int stateless_connect(const char *service_name)
1438 {
1439         struct discovery *discover;
1440         struct rpc_state rpc = RPC_STATE_INIT;
1441         struct strbuf buf = STRBUF_INIT;
1442         const char *accept_language;
1443
1444         /*
1445          * Run the info/refs request and see if the server supports protocol
1446          * v2.  If and only if the server supports v2 can we successfully
1447          * establish a stateless connection, otherwise we need to tell the
1448          * client to fallback to using other transport helper functions to
1449          * complete their request.
1450          */
1451         discover = discover_refs(service_name, 0);
1452         if (discover->version != protocol_v2) {
1453                 printf("fallback\n");
1454                 fflush(stdout);
1455                 return -1;
1456         } else {
1457                 /* Stateless Connection established */
1458                 printf("\n");
1459                 fflush(stdout);
1460         }
1461         accept_language = http_get_accept_language_header();
1462         if (accept_language)
1463                 rpc.hdr_accept_language = xstrfmt("%s", accept_language);
1464
1465         rpc.service_name = service_name;
1466         rpc.service_url = xstrfmt("%s%s", url.buf, rpc.service_name);
1467         rpc.hdr_content_type = xstrfmt("Content-Type: application/x-%s-request", rpc.service_name);
1468         rpc.hdr_accept = xstrfmt("Accept: application/x-%s-result", rpc.service_name);
1469         if (get_protocol_http_header(discover->version, &buf)) {
1470                 rpc.protocol_header = strbuf_detach(&buf, NULL);
1471         } else {
1472                 rpc.protocol_header = NULL;
1473                 strbuf_release(&buf);
1474         }
1475         rpc.buf = xmalloc(http_post_buffer);
1476         rpc.alloc = http_post_buffer;
1477         rpc.len = 0;
1478         rpc.pos = 0;
1479         rpc.in = 1;
1480         rpc.out = 0;
1481         rpc.any_written = 0;
1482         rpc.gzip_request = 1;
1483         rpc.initial_buffer = 0;
1484         rpc.write_line_lengths = 1;
1485         rpc.flush_read_but_not_sent = 0;
1486
1487         /*
1488          * Dump the capability listing that we got from the server earlier
1489          * during the info/refs request.
1490          */
1491         write_or_die(rpc.in, discover->buf, discover->len);
1492
1493         /* Until we see EOF keep sending POSTs */
1494         while (1) {
1495                 size_t avail;
1496                 enum packet_read_status status;
1497
1498                 if (!rpc_read_from_out(&rpc, PACKET_READ_GENTLE_ON_EOF, &avail,
1499                                        &status))
1500                         BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
1501                 if (status == PACKET_READ_EOF)
1502                         break;
1503                 if (post_rpc(&rpc, 1, status == PACKET_READ_FLUSH))
1504                         /* We would have an err here */
1505                         break;
1506                 /* Reset the buffer for next request */
1507                 rpc.len = 0;
1508         }
1509
1510         free(rpc.service_url);
1511         free(rpc.hdr_content_type);
1512         free(rpc.hdr_accept);
1513         free(rpc.hdr_accept_language);
1514         free(rpc.protocol_header);
1515         free(rpc.buf);
1516         strbuf_release(&buf);
1517
1518         return 0;
1519 }
1520
1521 int cmd_main(int argc, const char **argv)
1522 {
1523         struct strbuf buf = STRBUF_INIT;
1524         int nongit;
1525         int ret = 1;
1526
1527         setup_git_directory_gently(&nongit);
1528         if (argc < 2) {
1529                 error(_("remote-curl: usage: git remote-curl <remote> [<url>]"));
1530                 goto cleanup;
1531         }
1532
1533         options.verbosity = 1;
1534         options.progress = !!isatty(2);
1535         options.thin = 1;
1536         string_list_init_dup(&options.deepen_not);
1537         string_list_init_dup(&options.push_options);
1538
1539         /*
1540          * Just report "remote-curl" here (folding all the various aliases
1541          * ("git-remote-http", "git-remote-https", and etc.) here since they
1542          * are all just copies of the same actual executable.
1543          */
1544         trace2_cmd_name("remote-curl");
1545
1546         remote = remote_get(argv[1]);
1547
1548         if (argc > 2) {
1549                 end_url_with_slash(&url, argv[2]);
1550         } else {
1551                 end_url_with_slash(&url, remote->url[0]);
1552         }
1553
1554         http_init(remote, url.buf, 0);
1555
1556         do {
1557                 const char *arg;
1558
1559                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1560                         if (ferror(stdin))
1561                                 error(_("remote-curl: error reading command stream from git"));
1562                         goto cleanup;
1563                 }
1564                 if (buf.len == 0)
1565                         break;
1566                 if (starts_with(buf.buf, "fetch ")) {
1567                         if (nongit)
1568                                 die(_("remote-curl: fetch attempted without a local repo"));
1569                         parse_fetch(&buf);
1570
1571                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1572                         int for_push = !!strstr(buf.buf + 4, "for-push");
1573                         output_refs(get_refs(for_push));
1574
1575                 } else if (starts_with(buf.buf, "push ")) {
1576                         parse_push(&buf);
1577
1578                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1579                         char *value = strchr(arg, ' ');
1580                         int result;
1581
1582                         if (value)
1583                                 *value++ = '\0';
1584                         else
1585                                 value = "true";
1586
1587                         result = set_option(arg, value);
1588                         if (!result)
1589                                 printf("ok\n");
1590                         else if (result < 0)
1591                                 printf("error invalid value\n");
1592                         else
1593                                 printf("unsupported\n");
1594                         fflush(stdout);
1595
1596                 } else if (skip_prefix(buf.buf, "get ", &arg)) {
1597                         parse_get(arg);
1598                         fflush(stdout);
1599
1600                 } else if (!strcmp(buf.buf, "capabilities")) {
1601                         printf("stateless-connect\n");
1602                         printf("fetch\n");
1603                         printf("get\n");
1604                         printf("option\n");
1605                         printf("push\n");
1606                         printf("check-connectivity\n");
1607                         printf("object-format\n");
1608                         printf("\n");
1609                         fflush(stdout);
1610                 } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1611                         if (!stateless_connect(arg))
1612                                 break;
1613                 } else {
1614                         error(_("remote-curl: unknown command '%s' from git"), buf.buf);
1615                         goto cleanup;
1616                 }
1617                 strbuf_reset(&buf);
1618         } while (1);
1619
1620         http_cleanup();
1621         ret = 0;
1622 cleanup:
1623         strbuf_release(&buf);
1624
1625         return ret;
1626 }