remote-curl.c

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