remote-curl.c

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