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 "argv-array.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                 from_promisor : 1,
  43                 no_dependents : 1,
  44                 atomic : 1;
  45 };
  46 static struct options options;
  47 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  48
  49 static int set_option(const char *name, const char *value)
  50 {
  51         if (!strcmp(name, "verbosity")) {
  52                 char *end;
  53                 int v = strtol(value, &end, 10);
  54                 if (value == end || *end)
  55                         return -1;
  56                 options.verbosity = v;
  57                 return 0;
  58         }
  59         else if (!strcmp(name, "progress")) {
  60                 if (!strcmp(value, "true"))
  61                         options.progress = 1;
  62                 else if (!strcmp(value, "false"))
  63                         options.progress = 0;
  64                 else
  65                         return -1;
  66                 return 0;
  67         }
  68         else if (!strcmp(name, "depth")) {
  69                 char *end;
  70                 unsigned long v = strtoul(value, &end, 10);
  71                 if (value == end || *end)
  72                         return -1;
  73                 options.depth = v;
  74                 return 0;
  75         }
  76         else if (!strcmp(name, "deepen-since")) {
  77                 options.deepen_since = xstrdup(value);
  78                 return 0;
  79         }
  80         else if (!strcmp(name, "deepen-not")) {
  81                 string_list_append(&options.deepen_not, value);
  82                 return 0;
  83         }
  84         else if (!strcmp(name, "deepen-relative")) {
  85                 if (!strcmp(value, "true"))
  86                         options.deepen_relative = 1;
  87                 else if (!strcmp(value, "false"))
  88                         options.deepen_relative = 0;
  89                 else
  90                         return -1;
  91                 return 0;
  92         }
  93         else if (!strcmp(name, "followtags")) {
  94                 if (!strcmp(value, "true"))
  95                         options.followtags = 1;
  96                 else if (!strcmp(value, "false"))
  97                         options.followtags = 0;
  98                 else
  99                         return -1;
 100                 return 0;
 101         }
 102         else if (!strcmp(name, "dry-run")) {
 103                 if (!strcmp(value, "true"))
 104                         options.dry_run = 1;
 105                 else if (!strcmp(value, "false"))
 106                         options.dry_run = 0;
 107                 else
 108                         return -1;
 109                 return 0;
 110         }
 111         else if (!strcmp(name, "check-connectivity")) {
 112                 if (!strcmp(value, "true"))
 113                         options.check_self_contained_and_connected = 1;
 114                 else if (!strcmp(value, "false"))
 115                         options.check_self_contained_and_connected = 0;
 116                 else
 117                         return -1;
 118                 return 0;
 119         }
 120         else if (!strcmp(name, "cas")) {
 121                 struct strbuf val = STRBUF_INIT;
 122                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 123                 string_list_append(&cas_options, val.buf);
 124                 strbuf_release(&val);
 125                 return 0;
 126         } else if (!strcmp(name, "cloning")) {
 127                 if (!strcmp(value, "true"))
 128                         options.cloning = 1;
 129                 else if (!strcmp(value, "false"))
 130                         options.cloning = 0;
 131                 else
 132                         return -1;
 133                 return 0;
 134         } else if (!strcmp(name, "update-shallow")) {
 135                 if (!strcmp(value, "true"))
 136                         options.update_shallow = 1;
 137                 else if (!strcmp(value, "false"))
 138                         options.update_shallow = 0;
 139                 else
 140                         return -1;
 141                 return 0;
 142         } else if (!strcmp(name, "pushcert")) {
 143                 if (!strcmp(value, "true"))
 144                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 145                 else if (!strcmp(value, "false"))
 146                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 147                 else if (!strcmp(value, "if-asked"))
 148                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 149                 else
 150                         return -1;
 151                 return 0;
 152         } else if (!strcmp(name, "atomic")) {
 153                 if (!strcmp(value, "true"))
 154                         options.atomic = 1;
 155                 else if (!strcmp(value, "false"))
 156                         options.atomic = 0;
 157                 else
 158                         return -1;
 159                 return 0;
 160         } else if (!strcmp(name, "push-option")) {
 161                 if (*value != '"')
 162                         string_list_append(&options.push_options, value);
 163                 else {
 164                         struct strbuf unquoted = STRBUF_INIT;
 165                         if (unquote_c_style(&unquoted, value, NULL) < 0)
 166                                 die(_("invalid quoting in push-option value: '%s'"), value);
 167                         string_list_append_nodup(&options.push_options,
 168                                                  strbuf_detach(&unquoted, NULL));
 169                 }
 170                 return 0;
 171
 172 #if LIBCURL_VERSION_NUM >= 0x070a08
 173         } else if (!strcmp(name, "family")) {
 174                 if (!strcmp(value, "ipv4"))
 175                         git_curl_ipresolve = CURL_IPRESOLVE_V4;
 176                 else if (!strcmp(value, "ipv6"))
 177                         git_curl_ipresolve = CURL_IPRESOLVE_V6;
 178                 else if (!strcmp(value, "all"))
 179                         git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 180                 else
 181                         return -1;
 182                 return 0;
 183 #endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 184         } else if (!strcmp(name, "from-promisor")) {
 185                 options.from_promisor = 1;
 186                 return 0;
 187         } else if (!strcmp(name, "no-dependents")) {
 188                 options.no_dependents = 1;
 189                 return 0;
 190         } else if (!strcmp(name, "filter")) {
 191                 options.filter = xstrdup(value);
 192                 return 0;
 193         } else {
 194                 return 1 /* unsupported */;
 195         }
 196 }
 197
 198 struct discovery {
 199         char *service;
 200         char *buf_alloc;
 201         char *buf;
 202         size_t len;
 203         struct ref *refs;
 204         struct oid_array shallow;
 205         enum protocol_version version;
 206         unsigned proto_git : 1;
 207 };
 208 static struct discovery *last_discovery;
 209
 210 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 211 {
 212         struct ref *list = NULL;
 213         struct packet_reader reader;
 214
 215         packet_reader_init(&reader, -1, heads->buf, heads->len,
 216                            PACKET_READ_CHOMP_NEWLINE |
 217                            PACKET_READ_GENTLE_ON_EOF |
 218                            PACKET_READ_DIE_ON_ERR_PACKET);
 219
 220         heads->version = discover_version(&reader);
 221         switch (heads->version) {
 222         case protocol_v2:
 223                 /*
 224                  * Do nothing.  This isn't a list of refs but rather a
 225                  * capability advertisement.  Client would have run
 226                  * 'stateless-connect' so we'll dump this capability listing
 227                  * and let them request the refs themselves.
 228                  */
 229                 break;
 230         case protocol_v1:
 231         case protocol_v0:
 232                 get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
 233                                  NULL, &heads->shallow);
 234                 break;
 235         case protocol_unknown_version:
 236                 BUG("unknown protocol version");
 237         }
 238
 239         return list;
 240 }
 241
 242 static struct ref *parse_info_refs(struct discovery *heads)
 243 {
 244         char *data, *start, *mid;
 245         char *ref_name;
 246         int i = 0;
 247
 248         struct ref *refs = NULL;
 249         struct ref *ref = NULL;
 250         struct ref *last_ref = NULL;
 251
 252         data = heads->buf;
 253         start = NULL;
 254         mid = data;
 255         while (i < heads->len) {
 256                 if (!start) {
 257                         start = &data[i];
 258                 }
 259                 if (data[i] == '\t')
 260                         mid = &data[i];
 261                 if (data[i] == '\n') {
 262                         if (mid - start != the_hash_algo->hexsz)
 263                                 die(_("%sinfo/refs not valid: is this a git repository?"),
 264                                     transport_anonymize_url(url.buf));
 265                         data[i] = 0;
 266                         ref_name = mid + 1;
 267                         ref = alloc_ref(ref_name);
 268                         get_oid_hex(start, &ref->old_oid);
 269                         if (!refs)
 270                                 refs = ref;
 271                         if (last_ref)
 272                                 last_ref->next = ref;
 273                         last_ref = ref;
 274                         start = NULL;
 275                 }
 276                 i++;
 277         }
 278
 279         ref = alloc_ref("HEAD");
 280         if (!http_fetch_ref(url.buf, ref) &&
 281             !resolve_remote_symref(ref, refs)) {
 282                 ref->next = refs;
 283                 refs = ref;
 284         } else {
 285                 free(ref);
 286         }
 287
 288         return refs;
 289 }
 290
 291 static void free_discovery(struct discovery *d)
 292 {
 293         if (d) {
 294                 if (d == last_discovery)
 295                         last_discovery = NULL;
 296                 free(d->shallow.oid);
 297                 free(d->buf_alloc);
 298                 free_refs(d->refs);
 299                 free(d->service);
 300                 free(d);
 301         }
 302 }
 303
 304 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 305                              struct strbuf *msg)
 306 {
 307         const char *p, *eol;
 308
 309         /*
 310          * We only show text/plain parts, as other types are likely
 311          * to be ugly to look at on the user's terminal.
 312          */
 313         if (strcmp(type->buf, "text/plain"))
 314                 return -1;
 315         if (charset->len)
 316                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 317
 318         strbuf_trim(msg);
 319         if (!msg->len)
 320                 return -1;
 321
 322         p = msg->buf;
 323         do {
 324                 eol = strchrnul(p, '\n');
 325                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 326                 p = eol + 1;
 327         } while(*eol);
 328         return 0;
 329 }
 330
 331 static int get_protocol_http_header(enum protocol_version version,
 332                                     struct strbuf *header)
 333 {
 334         if (version > 0) {
 335                 strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
 336                             version);
 337
 338                 return 1;
 339         }
 340
 341         return 0;
 342 }
 343
 344 static void check_smart_http(struct discovery *d, const char *service,
 345                              struct strbuf *type)
 346 {
 347         const char *p;
 348         struct packet_reader reader;
 349
 350         /*
 351          * If we don't see x-$service-advertisement, then it's not smart-http.
 352          * But once we do, we commit to it and assume any other protocol
 353          * violations are hard errors.
 354          */
 355         if (!skip_prefix(type->buf, "application/x-", &p) ||
 356             !skip_prefix(p, service, &p) ||
 357             strcmp(p, "-advertisement"))
 358                 return;
 359
 360         packet_reader_init(&reader, -1, d->buf, d->len,
 361                            PACKET_READ_CHOMP_NEWLINE |
 362                            PACKET_READ_DIE_ON_ERR_PACKET);
 363         if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
 364                 die(_("invalid server response; expected service, got flush packet"));
 365
 366         if (skip_prefix(reader.line, "# service=", &p) && !strcmp(p, service)) {
 367                 /*
 368                  * The header can include additional metadata lines, up
 369                  * until a packet flush marker.  Ignore these now, but
 370                  * in the future we might start to scan them.
 371                  */
 372                 for (;;) {
 373                         packet_reader_read(&reader);
 374                         if (reader.pktlen <= 0) {
 375                                 break;
 376                         }
 377                 }
 378
 379                 /*
 380                  * v0 smart http; callers expect us to soak up the
 381                  * service and header packets
 382                  */
 383                 d->buf = reader.src_buffer;
 384                 d->len = reader.src_len;
 385                 d->proto_git = 1;
 386
 387         } else if (!strcmp(reader.line, "version 2")) {
 388                 /*
 389                  * v2 smart http; do not consume version packet, which will
 390                  * be handled elsewhere.
 391                  */
 392                 d->proto_git = 1;
 393
 394         } else {
 395                 die(_("invalid server response; got '%s'"), reader.line);
 396         }
 397 }
 398
 399 static struct discovery *discover_refs(const char *service, int for_push)
 400 {
 401         struct strbuf type = STRBUF_INIT;
 402         struct strbuf charset = STRBUF_INIT;
 403         struct strbuf buffer = STRBUF_INIT;
 404         struct strbuf refs_url = STRBUF_INIT;
 405         struct strbuf effective_url = STRBUF_INIT;
 406         struct strbuf protocol_header = STRBUF_INIT;
 407         struct string_list extra_headers = STRING_LIST_INIT_DUP;
 408         struct discovery *last = last_discovery;
 409         int http_ret, maybe_smart = 0;
 410         struct http_get_options http_options;
 411         enum protocol_version version = get_protocol_version_config();
 412
 413         if (last && !strcmp(service, last->service))
 414                 return last;
 415         free_discovery(last);
 416
 417         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 418         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 419              git_env_bool("GIT_SMART_HTTP", 1)) {
 420                 maybe_smart = 1;
 421                 if (!strchr(url.buf, '?'))
 422                         strbuf_addch(&refs_url, '?');
 423                 else
 424                         strbuf_addch(&refs_url, '&');
 425                 strbuf_addf(&refs_url, "service=%s", service);
 426         }
 427
 428         /*
 429          * NEEDSWORK: If we are trying to use protocol v2 and we are planning
 430          * to perform a push, then fallback to v0 since the client doesn't know
 431          * how to push yet using v2.
 432          */
 433         if (version == protocol_v2 && !strcmp("git-receive-pack", service))
 434                 version = protocol_v0;
 435
 436         /* Add the extra Git-Protocol header */
 437         if (get_protocol_http_header(version, &protocol_header))
 438                 string_list_append(&extra_headers, protocol_header.buf);
 439
 440         memset(&http_options, 0, sizeof(http_options));
 441         http_options.content_type = &type;
 442         http_options.charset = &charset;
 443         http_options.effective_url = &effective_url;
 444         http_options.base_url = &url;
 445         http_options.extra_headers = &extra_headers;
 446         http_options.initial_request = 1;
 447         http_options.no_cache = 1;
 448
 449         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 450         switch (http_ret) {
 451         case HTTP_OK:
 452                 break;
 453         case HTTP_MISSING_TARGET:
 454                 show_http_message(&type, &charset, &buffer);
 455                 die(_("repository '%s' not found"),
 456                     transport_anonymize_url(url.buf));
 457         case HTTP_NOAUTH:
 458                 show_http_message(&type, &charset, &buffer);
 459                 die(_("Authentication failed for '%s'"),
 460                     transport_anonymize_url(url.buf));
 461         default:
 462                 show_http_message(&type, &charset, &buffer);
 463                 die(_("unable to access '%s': %s"),
 464                     transport_anonymize_url(url.buf), curl_errorstr);
 465         }
 466
 467         if (options.verbosity && !starts_with(refs_url.buf, url.buf)) {
 468                 char *u = transport_anonymize_url(url.buf);
 469                 warning(_("redirecting to %s"), u);
 470                 free(u);
 471         }
 472
 473         last= xcalloc(1, sizeof(*last_discovery));
 474         last->service = xstrdup(service);
 475         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 476         last->buf = last->buf_alloc;
 477
 478         if (maybe_smart)
 479                 check_smart_http(last, service, &type);
 480
 481         if (last->proto_git)
 482                 last->refs = parse_git_refs(last, for_push);
 483         else
 484                 last->refs = parse_info_refs(last);
 485
 486         strbuf_release(&refs_url);
 487         strbuf_release(&type);
 488         strbuf_release(&charset);
 489         strbuf_release(&effective_url);
 490         strbuf_release(&buffer);
 491         strbuf_release(&protocol_header);
 492         string_list_clear(&extra_headers, 0);
 493         last_discovery = last;
 494         return last;
 495 }
 496
 497 static struct ref *get_refs(int for_push)
 498 {
 499         struct discovery *heads;
 500
 501         if (for_push)
 502                 heads = discover_refs("git-receive-pack", for_push);
 503         else
 504                 heads = discover_refs("git-upload-pack", for_push);
 505
 506         return heads->refs;
 507 }
 508
 509 static void output_refs(struct ref *refs)
 510 {
 511         struct ref *posn;
 512         for (posn = refs; posn; posn = posn->next) {
 513                 if (posn->symref)
 514                         printf("@%s %s\n", posn->symref, posn->name);
 515                 else
 516                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 517         }
 518         printf("\n");
 519         fflush(stdout);
 520 }
 521
 522 struct rpc_state {
 523         const char *service_name;
 524         char *service_url;
 525         char *hdr_content_type;
 526         char *hdr_accept;
 527         char *protocol_header;
 528         char *buf;
 529         size_t alloc;
 530         size_t len;
 531         size_t pos;
 532         int in;
 533         int out;
 534         int any_written;
 535         unsigned gzip_request : 1;
 536         unsigned initial_buffer : 1;
 537
 538         /*
 539          * Whenever a pkt-line is read into buf, append the 4 characters
 540          * denoting its length before appending the payload.
 541          */
 542         unsigned write_line_lengths : 1;
 543
 544         /*
 545          * Used by rpc_out; initialize to 0. This is true if a flush has been
 546          * read, but the corresponding line length (if write_line_lengths is
 547          * true) and EOF have not been sent to libcurl. Since each flush marks
 548          * the end of a request, each flush must be completely sent before any
 549          * further reading occurs.
 550          */
 551         unsigned flush_read_but_not_sent : 1;
 552 };
 553
 554 /*
 555  * Appends the result of reading from rpc->out to the string represented by
 556  * rpc->buf and rpc->len if there is enough space. Returns 1 if there was
 557  * enough space, 0 otherwise.
 558  *
 559  * If rpc->write_line_lengths is true, appends the line length as a 4-byte
 560  * hexadecimal string before appending the result described above.
 561  *
 562  * Writes the total number of bytes appended into appended.
 563  */
 564 static int rpc_read_from_out(struct rpc_state *rpc, int options,
 565                              size_t *appended,
 566                              enum packet_read_status *status) {
 567         size_t left;
 568         char *buf;
 569         int pktlen_raw;
 570
 571         if (rpc->write_line_lengths) {
 572                 left = rpc->alloc - rpc->len - 4;
 573                 buf = rpc->buf + rpc->len + 4;
 574         } else {
 575                 left = rpc->alloc - rpc->len;
 576                 buf = rpc->buf + rpc->len;
 577         }
 578
 579         if (left < LARGE_PACKET_MAX)
 580                 return 0;
 581
 582         *status = packet_read_with_status(rpc->out, NULL, NULL, buf,
 583                         left, &pktlen_raw, options);
 584         if (*status != PACKET_READ_EOF) {
 585                 *appended = pktlen_raw + (rpc->write_line_lengths ? 4 : 0);
 586                 rpc->len += *appended;
 587         }
 588
 589         if (rpc->write_line_lengths) {
 590                 switch (*status) {
 591                 case PACKET_READ_EOF:
 592                         if (!(options & PACKET_READ_GENTLE_ON_EOF))
 593                                 die(_("shouldn't have EOF when not gentle on EOF"));
 594                         break;
 595                 case PACKET_READ_NORMAL:
 596                         set_packet_header(buf - 4, *appended);
 597                         break;
 598                 case PACKET_READ_DELIM:
 599                         memcpy(buf - 4, "0001", 4);
 600                         break;
 601                 case PACKET_READ_FLUSH:
 602                         memcpy(buf - 4, "0000", 4);
 603                         break;
 604                 case PACKET_READ_RESPONSE_END:
 605                         die(_("remote server sent stateless separator"));
 606                 }
 607         }
 608
 609         return 1;
 610 }
 611
 612 static size_t rpc_out(void *ptr, size_t eltsize,
 613                 size_t nmemb, void *buffer_)
 614 {
 615         size_t max = eltsize * nmemb;
 616         struct rpc_state *rpc = buffer_;
 617         size_t avail = rpc->len - rpc->pos;
 618         enum packet_read_status status;
 619
 620         if (!avail) {
 621                 rpc->initial_buffer = 0;
 622                 rpc->len = 0;
 623                 rpc->pos = 0;
 624                 if (!rpc->flush_read_but_not_sent) {
 625                         if (!rpc_read_from_out(rpc, 0, &avail, &status))
 626                                 BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
 627                         if (status == PACKET_READ_FLUSH)
 628                                 rpc->flush_read_but_not_sent = 1;
 629                 }
 630                 /*
 631                  * If flush_read_but_not_sent is true, we have already read one
 632                  * full request but have not fully sent it + EOF, which is why
 633                  * we need to refrain from reading.
 634                  */
 635         }
 636         if (rpc->flush_read_but_not_sent) {
 637                 if (!avail) {
 638                         /*
 639                          * The line length either does not need to be sent at
 640                          * all or has already been completely sent. Now we can
 641                          * return 0, indicating EOF, meaning that the flush has
 642                          * been fully sent.
 643                          */
 644                         rpc->flush_read_but_not_sent = 0;
 645                         return 0;
 646                 }
 647                 /*
 648                  * If avail is non-zero, the line length for the flush still
 649                  * hasn't been fully sent. Proceed with sending the line
 650                  * length.
 651                  */
 652         }
 653
 654         if (max < avail)
 655                 avail = max;
 656         memcpy(ptr, rpc->buf + rpc->pos, avail);
 657         rpc->pos += avail;
 658         return avail;
 659 }
 660
 661 #ifndef NO_CURL_IOCTL
 662 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 663 {
 664         struct rpc_state *rpc = clientp;
 665
 666         switch (cmd) {
 667         case CURLIOCMD_NOP:
 668                 return CURLIOE_OK;
 669
 670         case CURLIOCMD_RESTARTREAD:
 671                 if (rpc->initial_buffer) {
 672                         rpc->pos = 0;
 673                         return CURLIOE_OK;
 674                 }
 675                 error(_("unable to rewind rpc post data - try increasing http.postBuffer"));
 676                 return CURLIOE_FAILRESTART;
 677
 678         default:
 679                 return CURLIOE_UNKNOWNCMD;
 680         }
 681 }
 682 #endif
 683
 684 struct check_pktline_state {
 685         char len_buf[4];
 686         int len_filled;
 687         int remaining;
 688 };
 689
 690 static void check_pktline(struct check_pktline_state *state, const char *ptr, size_t size)
 691 {
 692         while (size) {
 693                 if (!state->remaining) {
 694                         int digits_remaining = 4 - state->len_filled;
 695                         if (digits_remaining > size)
 696                                 digits_remaining = size;
 697                         memcpy(&state->len_buf[state->len_filled], ptr, digits_remaining);
 698                         state->len_filled += digits_remaining;
 699                         ptr += digits_remaining;
 700                         size -= digits_remaining;
 701
 702                         if (state->len_filled == 4) {
 703                                 state->remaining = packet_length(state->len_buf);
 704                                 if (state->remaining < 0) {
 705                                         die(_("remote-curl: bad line length character: %.4s"), state->len_buf);
 706                                 } else if (state->remaining == 2) {
 707                                         die(_("remote-curl: unexpected response end packet"));
 708                                 } else if (state->remaining < 4) {
 709                                         state->remaining = 0;
 710                                 } else {
 711                                         state->remaining -= 4;
 712                                 }
 713                                 state->len_filled = 0;
 714                         }
 715                 }
 716
 717                 if (state->remaining) {
 718                         int remaining = state->remaining;
 719                         if (remaining > size)
 720                                 remaining = size;
 721                         ptr += remaining;
 722                         size -= remaining;
 723                         state->remaining -= remaining;
 724                 }
 725         }
 726 }
 727
 728 struct rpc_in_data {
 729         struct rpc_state *rpc;
 730         struct active_request_slot *slot;
 731         int check_pktline;
 732         struct check_pktline_state pktline_state;
 733 };
 734
 735 /*
 736  * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
 737  * from ptr.
 738  */
 739 static size_t rpc_in(char *ptr, size_t eltsize,
 740                 size_t nmemb, void *buffer_)
 741 {
 742         size_t size = eltsize * nmemb;
 743         struct rpc_in_data *data = buffer_;
 744         long response_code;
 745
 746         if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
 747                               &response_code) != CURLE_OK)
 748                 return size;
 749         if (response_code >= 300)
 750                 return size;
 751         if (size)
 752                 data->rpc->any_written = 1;
 753         if (data->check_pktline)
 754                 check_pktline(&data->pktline_state, ptr, size);
 755         write_or_die(data->rpc->in, ptr, size);
 756         return size;
 757 }
 758
 759 static int run_slot(struct active_request_slot *slot,
 760                     struct slot_results *results)
 761 {
 762         int err;
 763         struct slot_results results_buf;
 764
 765         if (!results)
 766                 results = &results_buf;
 767
 768         err = run_one_slot(slot, results);
 769
 770         if (err != HTTP_OK && err != HTTP_REAUTH) {
 771                 struct strbuf msg = STRBUF_INIT;
 772                 if (results->http_code && results->http_code != 200)
 773                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 774                 if (results->curl_result != CURLE_OK) {
 775                         if (msg.len)
 776                                 strbuf_addch(&msg, ' ');
 777                         strbuf_addf(&msg, "curl %d", results->curl_result);
 778                         if (curl_errorstr[0]) {
 779                                 strbuf_addch(&msg, ' ');
 780                                 strbuf_addstr(&msg, curl_errorstr);
 781                         }
 782                 }
 783                 error(_("RPC failed; %s"), msg.buf);
 784                 strbuf_release(&msg);
 785         }
 786
 787         return err;
 788 }
 789
 790 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 791 {
 792         struct active_request_slot *slot;
 793         struct curl_slist *headers = http_copy_default_headers();
 794         struct strbuf buf = STRBUF_INIT;
 795         int err;
 796
 797         slot = get_active_slot();
 798
 799         headers = curl_slist_append(headers, rpc->hdr_content_type);
 800         headers = curl_slist_append(headers, rpc->hdr_accept);
 801
 802         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 803         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 804         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 805         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 806         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 807         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 808         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 809         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 810         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 811
 812         err = run_slot(slot, results);
 813
 814         curl_slist_free_all(headers);
 815         strbuf_release(&buf);
 816         return err;
 817 }
 818
 819 static curl_off_t xcurl_off_t(size_t len)
 820 {
 821         uintmax_t size = len;
 822         if (size > maximum_signed_value_of_type(curl_off_t))
 823                 die(_("cannot handle pushes this big"));
 824         return (curl_off_t)size;
 825 }
 826
 827 /*
 828  * If flush_received is true, do not attempt to read any more; just use what's
 829  * in rpc->buf.
 830  */
 831 static int post_rpc(struct rpc_state *rpc, int stateless_connect, int flush_received)
 832 {
 833         struct active_request_slot *slot;
 834         struct curl_slist *headers = http_copy_default_headers();
 835         int use_gzip = rpc->gzip_request;
 836         char *gzip_body = NULL;
 837         size_t gzip_size = 0;
 838         int err, large_request = 0;
 839         int needs_100_continue = 0;
 840         struct rpc_in_data rpc_in_data;
 841
 842         /* Try to load the entire request, if we can fit it into the
 843          * allocated buffer space we can use HTTP/1.0 and avoid the
 844          * chunked encoding mess.
 845          */
 846         if (!flush_received) {
 847                 while (1) {
 848                         size_t n;
 849                         enum packet_read_status status;
 850
 851                         if (!rpc_read_from_out(rpc, 0, &n, &status)) {
 852                                 large_request = 1;
 853                                 use_gzip = 0;
 854                                 break;
 855                         }
 856                         if (status == PACKET_READ_FLUSH)
 857                                 break;
 858                 }
 859         }
 860
 861         if (large_request) {
 862                 struct slot_results results;
 863
 864                 do {
 865                         err = probe_rpc(rpc, &results);
 866                         if (err == HTTP_REAUTH)
 867                                 credential_fill(&http_auth);
 868                 } while (err == HTTP_REAUTH);
 869                 if (err != HTTP_OK)
 870                         return -1;
 871
 872                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 873                         needs_100_continue = 1;
 874         }
 875
 876         headers = curl_slist_append(headers, rpc->hdr_content_type);
 877         headers = curl_slist_append(headers, rpc->hdr_accept);
 878         headers = curl_slist_append(headers, needs_100_continue ?
 879                 "Expect: 100-continue" : "Expect:");
 880
 881         /* Add the extra Git-Protocol header */
 882         if (rpc->protocol_header)
 883                 headers = curl_slist_append(headers, rpc->protocol_header);
 884
 885 retry:
 886         slot = get_active_slot();
 887
 888         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 889         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 890         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 891         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 892
 893         if (large_request) {
 894                 /* The request body is large and the size cannot be predicted.
 895                  * We must use chunked encoding to send it.
 896                  */
 897                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 898                 rpc->initial_buffer = 1;
 899                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 900                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 901 #ifndef NO_CURL_IOCTL
 902                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 903                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 904 #endif
 905                 if (options.verbosity > 1) {
 906                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 907                         fflush(stderr);
 908                 }
 909
 910         } else if (gzip_body) {
 911                 /*
 912                  * If we are looping to retry authentication, then the previous
 913                  * run will have set up the headers and gzip buffer already,
 914                  * and we just need to send it.
 915                  */
 916                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 917                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 918
 919         } else if (use_gzip && 1024 < rpc->len) {
 920                 /* The client backend isn't giving us compressed data so
 921                  * we can try to deflate it ourselves, this may save on
 922                  * the transfer time.
 923                  */
 924                 git_zstream stream;
 925                 int ret;
 926
 927                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 928                 gzip_size = git_deflate_bound(&stream, rpc->len);
 929                 gzip_body = xmalloc(gzip_size);
 930
 931                 stream.next_in = (unsigned char *)rpc->buf;
 932                 stream.avail_in = rpc->len;
 933                 stream.next_out = (unsigned char *)gzip_body;
 934                 stream.avail_out = gzip_size;
 935
 936                 ret = git_deflate(&stream, Z_FINISH);
 937                 if (ret != Z_STREAM_END)
 938                         die(_("cannot deflate request; zlib deflate error %d"), ret);
 939
 940                 ret = git_deflate_end_gently(&stream);
 941                 if (ret != Z_OK)
 942                         die(_("cannot deflate request; zlib end error %d"), ret);
 943
 944                 gzip_size = stream.total_out;
 945
 946                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 947                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 948                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 949
 950                 if (options.verbosity > 1) {
 951                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 952                                 rpc->service_name,
 953                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 954                         fflush(stderr);
 955                 }
 956         } else {
 957                 /* We know the complete request size in advance, use the
 958                  * more normal Content-Length approach.
 959                  */
 960                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 961                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 962                 if (options.verbosity > 1) {
 963                         fprintf(stderr, "POST %s (%lu bytes)\n",
 964                                 rpc->service_name, (unsigned long)rpc->len);
 965                         fflush(stderr);
 966                 }
 967         }
 968
 969         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 970         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 971         rpc_in_data.rpc = rpc;
 972         rpc_in_data.slot = slot;
 973         rpc_in_data.check_pktline = stateless_connect;
 974         memset(&rpc_in_data.pktline_state, 0, sizeof(rpc_in_data.pktline_state));
 975         curl_easy_setopt(slot->curl, CURLOPT_FILE, &rpc_in_data);
 976         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
 977
 978
 979         rpc->any_written = 0;
 980         err = run_slot(slot, NULL);
 981         if (err == HTTP_REAUTH && !large_request) {
 982                 credential_fill(&http_auth);
 983                 goto retry;
 984         }
 985         if (err != HTTP_OK)
 986                 err = -1;
 987
 988         if (!rpc->any_written)
 989                 err = -1;
 990
 991         if (rpc_in_data.pktline_state.len_filled)
 992                 err = error(_("%d bytes of length header were received"), rpc_in_data.pktline_state.len_filled);
 993         if (rpc_in_data.pktline_state.remaining)
 994                 err = error(_("%d bytes of body are still expected"), rpc_in_data.pktline_state.remaining);
 995
 996         if (stateless_connect)
 997                 packet_response_end(rpc->in);
 998
 999         curl_slist_free_all(headers);
1000         free(gzip_body);
1001         return err;
1002 }
1003
1004 static int rpc_service(struct rpc_state *rpc, struct discovery *heads,
1005                        const char **client_argv, const struct strbuf *preamble,
1006                        struct strbuf *rpc_result)
1007 {
1008         const char *svc = rpc->service_name;
1009         struct strbuf buf = STRBUF_INIT;
1010         struct child_process client = CHILD_PROCESS_INIT;
1011         int err = 0;
1012
1013         client.in = -1;
1014         client.out = -1;
1015         client.git_cmd = 1;
1016         client.argv = client_argv;
1017         if (start_command(&client))
1018                 exit(1);
1019         write_or_die(client.in, preamble->buf, preamble->len);
1020         if (heads)
1021                 write_or_die(client.in, heads->buf, heads->len);
1022
1023         rpc->alloc = http_post_buffer;
1024         rpc->buf = xmalloc(rpc->alloc);
1025         rpc->in = client.in;
1026         rpc->out = client.out;
1027
1028         strbuf_addf(&buf, "%s%s", url.buf, svc);
1029         rpc->service_url = strbuf_detach(&buf, NULL);
1030
1031         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
1032         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
1033
1034         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
1035         rpc->hdr_accept = strbuf_detach(&buf, NULL);
1036
1037         if (get_protocol_http_header(heads->version, &buf))
1038                 rpc->protocol_header = strbuf_detach(&buf, NULL);
1039         else
1040                 rpc->protocol_header = NULL;
1041
1042         while (!err) {
1043                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
1044                 if (!n)
1045                         break;
1046                 rpc->pos = 0;
1047                 rpc->len = n;
1048                 err |= post_rpc(rpc, 0, 0);
1049         }
1050
1051         close(client.in);
1052         client.in = -1;
1053         if (!err) {
1054                 strbuf_read(rpc_result, client.out, 0);
1055         } else {
1056                 char buf[4096];
1057                 for (;;)
1058                         if (xread(client.out, buf, sizeof(buf)) <= 0)
1059                                 break;
1060         }
1061
1062         close(client.out);
1063         client.out = -1;
1064
1065         err |= finish_command(&client);
1066         free(rpc->service_url);
1067         free(rpc->hdr_content_type);
1068         free(rpc->hdr_accept);
1069         free(rpc->protocol_header);
1070         free(rpc->buf);
1071         strbuf_release(&buf);
1072         return err;
1073 }
1074
1075 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
1076 {
1077         struct walker *walker;
1078         char **targets;
1079         int ret, i;
1080
1081         ALLOC_ARRAY(targets, nr_heads);
1082         if (options.depth || options.deepen_since)
1083                 die(_("dumb http transport does not support shallow capabilities"));
1084         for (i = 0; i < nr_heads; i++)
1085                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
1086
1087         walker = get_http_walker(url.buf);
1088         walker->get_verbosely = options.verbosity >= 3;
1089         walker->get_progress = options.progress;
1090         walker->get_recover = 0;
1091         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
1092         walker_free(walker);
1093
1094         for (i = 0; i < nr_heads; i++)
1095                 free(targets[i]);
1096         free(targets);
1097
1098         return ret ? error(_("fetch failed.")) : 0;
1099 }
1100
1101 static int fetch_git(struct discovery *heads,
1102         int nr_heads, struct ref **to_fetch)
1103 {
1104         struct rpc_state rpc;
1105         struct strbuf preamble = STRBUF_INIT;
1106         int i, err;
1107         struct argv_array args = ARGV_ARRAY_INIT;
1108         struct strbuf rpc_result = STRBUF_INIT;
1109
1110         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
1111                          "--stdin", "--lock-pack", NULL);
1112         if (options.followtags)
1113                 argv_array_push(&args, "--include-tag");
1114         if (options.thin)
1115                 argv_array_push(&args, "--thin");
1116         if (options.verbosity >= 3)
1117                 argv_array_pushl(&args, "-v", "-v", NULL);
1118         if (options.check_self_contained_and_connected)
1119                 argv_array_push(&args, "--check-self-contained-and-connected");
1120         if (options.cloning)
1121                 argv_array_push(&args, "--cloning");
1122         if (options.update_shallow)
1123                 argv_array_push(&args, "--update-shallow");
1124         if (!options.progress)
1125                 argv_array_push(&args, "--no-progress");
1126         if (options.depth)
1127                 argv_array_pushf(&args, "--depth=%lu", options.depth);
1128         if (options.deepen_since)
1129                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
1130         for (i = 0; i < options.deepen_not.nr; i++)
1131                 argv_array_pushf(&args, "--shallow-exclude=%s",
1132                                  options.deepen_not.items[i].string);
1133         if (options.deepen_relative && options.depth)
1134                 argv_array_push(&args, "--deepen-relative");
1135         if (options.from_promisor)
1136                 argv_array_push(&args, "--from-promisor");
1137         if (options.no_dependents)
1138                 argv_array_push(&args, "--no-dependents");
1139         if (options.filter)
1140                 argv_array_pushf(&args, "--filter=%s", options.filter);
1141         argv_array_push(&args, url.buf);
1142
1143         for (i = 0; i < nr_heads; i++) {
1144                 struct ref *ref = to_fetch[i];
1145                 if (!*ref->name)
1146                         die(_("cannot fetch by sha1 over smart http"));
1147                 packet_buf_write(&preamble, "%s %s\n",
1148                                  oid_to_hex(&ref->old_oid), ref->name);
1149         }
1150         packet_buf_flush(&preamble);
1151
1152         memset(&rpc, 0, sizeof(rpc));
1153         rpc.service_name = "git-upload-pack",
1154         rpc.gzip_request = 1;
1155
1156         err = rpc_service(&rpc, heads, args.argv, &preamble, &rpc_result);
1157         if (rpc_result.len)
1158                 write_or_die(1, rpc_result.buf, rpc_result.len);
1159         strbuf_release(&rpc_result);
1160         strbuf_release(&preamble);
1161         argv_array_clear(&args);
1162         return err;
1163 }
1164
1165 static int fetch(int nr_heads, struct ref **to_fetch)
1166 {
1167         struct discovery *d = discover_refs("git-upload-pack", 0);
1168         if (d->proto_git)
1169                 return fetch_git(d, nr_heads, to_fetch);
1170         else
1171                 return fetch_dumb(nr_heads, to_fetch);
1172 }
1173
1174 static void parse_fetch(struct strbuf *buf)
1175 {
1176         struct ref **to_fetch = NULL;
1177         struct ref *list_head = NULL;
1178         struct ref **list = &list_head;
1179         int alloc_heads = 0, nr_heads = 0;
1180
1181         do {
1182                 const char *p;
1183                 if (skip_prefix(buf->buf, "fetch ", &p)) {
1184                         const char *name;
1185                         struct ref *ref;
1186                         struct object_id old_oid;
1187                         const char *q;
1188
1189                         if (parse_oid_hex(p, &old_oid, &q))
1190                                 die(_("protocol error: expected sha/ref, got '%s'"), p);
1191                         if (*q == ' ')
1192                                 name = q + 1;
1193                         else if (!*q)
1194                                 name = "";
1195                         else
1196                                 die(_("protocol error: expected sha/ref, got '%s'"), p);
1197
1198                         ref = alloc_ref(name);
1199                         oidcpy(&ref->old_oid, &old_oid);
1200
1201                         *list = ref;
1202                         list = &ref->next;
1203
1204                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1205                         to_fetch[nr_heads++] = ref;
1206                 }
1207                 else
1208                         die(_("http transport does not support %s"), buf->buf);
1209
1210                 strbuf_reset(buf);
1211                 if (strbuf_getline_lf(buf, stdin) == EOF)
1212                         return;
1213                 if (!*buf->buf)
1214                         break;
1215         } while (1);
1216
1217         if (fetch(nr_heads, to_fetch))
1218                 exit(128); /* error already reported */
1219         free_refs(list_head);
1220         free(to_fetch);
1221
1222         printf("\n");
1223         fflush(stdout);
1224         strbuf_reset(buf);
1225 }
1226
1227 static int push_dav(int nr_spec, const char **specs)
1228 {
1229         struct child_process child = CHILD_PROCESS_INIT;
1230         size_t i;
1231
1232         child.git_cmd = 1;
1233         argv_array_push(&child.args, "http-push");
1234         argv_array_push(&child.args, "--helper-status");
1235         if (options.dry_run)
1236                 argv_array_push(&child.args, "--dry-run");
1237         if (options.verbosity > 1)
1238                 argv_array_push(&child.args, "--verbose");
1239         argv_array_push(&child.args, url.buf);
1240         for (i = 0; i < nr_spec; i++)
1241                 argv_array_push(&child.args, specs[i]);
1242
1243         if (run_command(&child))
1244                 die(_("git-http-push failed"));
1245         return 0;
1246 }
1247
1248 static int push_git(struct discovery *heads, int nr_spec, const char **specs)
1249 {
1250         struct rpc_state rpc;
1251         int i, err;
1252         struct argv_array args;
1253         struct string_list_item *cas_option;
1254         struct strbuf preamble = STRBUF_INIT;
1255         struct strbuf rpc_result = STRBUF_INIT;
1256
1257         argv_array_init(&args);
1258         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1259                          NULL);
1260
1261         if (options.thin)
1262                 argv_array_push(&args, "--thin");
1263         if (options.dry_run)
1264                 argv_array_push(&args, "--dry-run");
1265         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1266                 argv_array_push(&args, "--signed=yes");
1267         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1268                 argv_array_push(&args, "--signed=if-asked");
1269         if (options.atomic)
1270                 argv_array_push(&args, "--atomic");
1271         if (options.verbosity == 0)
1272                 argv_array_push(&args, "--quiet");
1273         else if (options.verbosity > 1)
1274                 argv_array_push(&args, "--verbose");
1275         for (i = 0; i < options.push_options.nr; i++)
1276                 argv_array_pushf(&args, "--push-option=%s",
1277                                  options.push_options.items[i].string);
1278         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1279         for_each_string_list_item(cas_option, &cas_options)
1280                 argv_array_push(&args, cas_option->string);
1281         argv_array_push(&args, url.buf);
1282
1283         argv_array_push(&args, "--stdin");
1284         for (i = 0; i < nr_spec; i++)
1285                 packet_buf_write(&preamble, "%s\n", specs[i]);
1286         packet_buf_flush(&preamble);
1287
1288         memset(&rpc, 0, sizeof(rpc));
1289         rpc.service_name = "git-receive-pack",
1290
1291         err = rpc_service(&rpc, heads, args.argv, &preamble, &rpc_result);
1292         if (rpc_result.len)
1293                 write_or_die(1, rpc_result.buf, rpc_result.len);
1294         strbuf_release(&rpc_result);
1295         strbuf_release(&preamble);
1296         argv_array_clear(&args);
1297         return err;
1298 }
1299
1300 static int push(int nr_spec, const char **specs)
1301 {
1302         struct discovery *heads = discover_refs("git-receive-pack", 1);
1303         int ret;
1304
1305         if (heads->proto_git)
1306                 ret = push_git(heads, nr_spec, specs);
1307         else
1308                 ret = push_dav(nr_spec, specs);
1309         free_discovery(heads);
1310         return ret;
1311 }
1312
1313 static void parse_push(struct strbuf *buf)
1314 {
1315         struct argv_array specs = ARGV_ARRAY_INIT;
1316         int ret;
1317
1318         do {
1319                 const char *arg;
1320                 if (skip_prefix(buf->buf, "push ", &arg))
1321                         argv_array_push(&specs, arg);
1322                 else
1323                         die(_("http transport does not support %s"), buf->buf);
1324
1325                 strbuf_reset(buf);
1326                 if (strbuf_getline_lf(buf, stdin) == EOF)
1327                         goto free_specs;
1328                 if (!*buf->buf)
1329                         break;
1330         } while (1);
1331
1332         ret = push(specs.argc, specs.argv);
1333         printf("\n");
1334         fflush(stdout);
1335
1336         if (ret)
1337                 exit(128); /* error already reported */
1338
1339 free_specs:
1340         argv_array_clear(&specs);
1341 }
1342
1343 static int stateless_connect(const char *service_name)
1344 {
1345         struct discovery *discover;
1346         struct rpc_state rpc;
1347         struct strbuf buf = STRBUF_INIT;
1348
1349         /*
1350          * Run the info/refs request and see if the server supports protocol
1351          * v2.  If and only if the server supports v2 can we successfully
1352          * establish a stateless connection, otherwise we need to tell the
1353          * client to fallback to using other transport helper functions to
1354          * complete their request.
1355          */
1356         discover = discover_refs(service_name, 0);
1357         if (discover->version != protocol_v2) {
1358                 printf("fallback\n");
1359                 fflush(stdout);
1360                 return -1;
1361         } else {
1362                 /* Stateless Connection established */
1363                 printf("\n");
1364                 fflush(stdout);
1365         }
1366
1367         rpc.service_name = service_name;
1368         rpc.service_url = xstrfmt("%s%s", url.buf, rpc.service_name);
1369         rpc.hdr_content_type = xstrfmt("Content-Type: application/x-%s-request", rpc.service_name);
1370         rpc.hdr_accept = xstrfmt("Accept: application/x-%s-result", rpc.service_name);
1371         if (get_protocol_http_header(discover->version, &buf)) {
1372                 rpc.protocol_header = strbuf_detach(&buf, NULL);
1373         } else {
1374                 rpc.protocol_header = NULL;
1375                 strbuf_release(&buf);
1376         }
1377         rpc.buf = xmalloc(http_post_buffer);
1378         rpc.alloc = http_post_buffer;
1379         rpc.len = 0;
1380         rpc.pos = 0;
1381         rpc.in = 1;
1382         rpc.out = 0;
1383         rpc.any_written = 0;
1384         rpc.gzip_request = 1;
1385         rpc.initial_buffer = 0;
1386         rpc.write_line_lengths = 1;
1387         rpc.flush_read_but_not_sent = 0;
1388
1389         /*
1390          * Dump the capability listing that we got from the server earlier
1391          * during the info/refs request.
1392          */
1393         write_or_die(rpc.in, discover->buf, discover->len);
1394
1395         /* Until we see EOF keep sending POSTs */
1396         while (1) {
1397                 size_t avail;
1398                 enum packet_read_status status;
1399
1400                 if (!rpc_read_from_out(&rpc, PACKET_READ_GENTLE_ON_EOF, &avail,
1401                                        &status))
1402                         BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
1403                 if (status == PACKET_READ_EOF)
1404                         break;
1405                 if (post_rpc(&rpc, 1, status == PACKET_READ_FLUSH))
1406                         /* We would have an err here */
1407                         break;
1408                 /* Reset the buffer for next request */
1409                 rpc.len = 0;
1410         }
1411
1412         free(rpc.service_url);
1413         free(rpc.hdr_content_type);
1414         free(rpc.hdr_accept);
1415         free(rpc.protocol_header);
1416         free(rpc.buf);
1417         strbuf_release(&buf);
1418
1419         return 0;
1420 }
1421
1422 int cmd_main(int argc, const char **argv)
1423 {
1424         struct strbuf buf = STRBUF_INIT;
1425         int nongit;
1426
1427         setup_git_directory_gently(&nongit);
1428         if (argc < 2) {
1429                 error(_("remote-curl: usage: git remote-curl <remote> [<url>]"));
1430                 return 1;
1431         }
1432
1433         options.verbosity = 1;
1434         options.progress = !!isatty(2);
1435         options.thin = 1;
1436         string_list_init(&options.deepen_not, 1);
1437         string_list_init(&options.push_options, 1);
1438
1439         /*
1440          * Just report "remote-curl" here (folding all the various aliases
1441          * ("git-remote-http", "git-remote-https", and etc.) here since they
1442          * are all just copies of the same actual executable.
1443          */
1444         trace2_cmd_name("remote-curl");
1445
1446         remote = remote_get(argv[1]);
1447
1448         if (argc > 2) {
1449                 end_url_with_slash(&url, argv[2]);
1450         } else {
1451                 end_url_with_slash(&url, remote->url[0]);
1452         }
1453
1454         http_init(remote, url.buf, 0);
1455
1456         do {
1457                 const char *arg;
1458
1459                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1460                         if (ferror(stdin))
1461                                 error(_("remote-curl: error reading command stream from git"));
1462                         return 1;
1463                 }
1464                 if (buf.len == 0)
1465                         break;
1466                 if (starts_with(buf.buf, "fetch ")) {
1467                         if (nongit)
1468                                 die(_("remote-curl: fetch attempted without a local repo"));
1469                         parse_fetch(&buf);
1470
1471                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1472                         int for_push = !!strstr(buf.buf + 4, "for-push");
1473                         output_refs(get_refs(for_push));
1474
1475                 } else if (starts_with(buf.buf, "push ")) {
1476                         parse_push(&buf);
1477
1478                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1479                         char *value = strchr(arg, ' ');
1480                         int result;
1481
1482                         if (value)
1483                                 *value++ = '\0';
1484                         else
1485                                 value = "true";
1486
1487                         result = set_option(arg, value);
1488                         if (!result)
1489                                 printf("ok\n");
1490                         else if (result < 0)
1491                                 printf("error invalid value\n");
1492                         else
1493                                 printf("unsupported\n");
1494                         fflush(stdout);
1495
1496                 } else if (!strcmp(buf.buf, "capabilities")) {
1497                         printf("stateless-connect\n");
1498                         printf("fetch\n");
1499                         printf("option\n");
1500                         printf("push\n");
1501                         printf("check-connectivity\n");
1502                         printf("\n");
1503                         fflush(stdout);
1504                 } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1505                         if (!stateless_connect(arg))
1506                                 break;
1507                 } else {
1508                         error(_("remote-curl: unknown command '%s' from git"), buf.buf);
1509                         return 1;
1510                 }
1511                 strbuf_reset(&buf);
1512         } while (1);
1513
1514         http_cleanup();
1515
1516         return 0;
1517 }