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 "sha1-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                 }
 605         }
 606
 607         return 1;
 608 }
 609
 610 static size_t rpc_out(void *ptr, size_t eltsize,
 611                 size_t nmemb, void *buffer_)
 612 {
 613         size_t max = eltsize * nmemb;
 614         struct rpc_state *rpc = buffer_;
 615         size_t avail = rpc->len - rpc->pos;
 616         enum packet_read_status status;
 617
 618         if (!avail) {
 619                 rpc->initial_buffer = 0;
 620                 rpc->len = 0;
 621                 rpc->pos = 0;
 622                 if (!rpc->flush_read_but_not_sent) {
 623                         if (!rpc_read_from_out(rpc, 0, &avail, &status))
 624                                 BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
 625                         if (status == PACKET_READ_FLUSH)
 626                                 rpc->flush_read_but_not_sent = 1;
 627                 }
 628                 /*
 629                  * If flush_read_but_not_sent is true, we have already read one
 630                  * full request but have not fully sent it + EOF, which is why
 631                  * we need to refrain from reading.
 632                  */
 633         }
 634         if (rpc->flush_read_but_not_sent) {
 635                 if (!avail) {
 636                         /*
 637                          * The line length either does not need to be sent at
 638                          * all or has already been completely sent. Now we can
 639                          * return 0, indicating EOF, meaning that the flush has
 640                          * been fully sent.
 641                          */
 642                         rpc->flush_read_but_not_sent = 0;
 643                         return 0;
 644                 }
 645                 /*
 646                  * If avail is non-zerp, the line length for the flush still
 647                  * hasn't been fully sent. Proceed with sending the line
 648                  * length.
 649                  */
 650         }
 651
 652         if (max < avail)
 653                 avail = max;
 654         memcpy(ptr, rpc->buf + rpc->pos, avail);
 655         rpc->pos += avail;
 656         return avail;
 657 }
 658
 659 #ifndef NO_CURL_IOCTL
 660 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 661 {
 662         struct rpc_state *rpc = clientp;
 663
 664         switch (cmd) {
 665         case CURLIOCMD_NOP:
 666                 return CURLIOE_OK;
 667
 668         case CURLIOCMD_RESTARTREAD:
 669                 if (rpc->initial_buffer) {
 670                         rpc->pos = 0;
 671                         return CURLIOE_OK;
 672                 }
 673                 error(_("unable to rewind rpc post data - try increasing http.postBuffer"));
 674                 return CURLIOE_FAILRESTART;
 675
 676         default:
 677                 return CURLIOE_UNKNOWNCMD;
 678         }
 679 }
 680 #endif
 681
 682 struct rpc_in_data {
 683         struct rpc_state *rpc;
 684         struct active_request_slot *slot;
 685 };
 686
 687 /*
 688  * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
 689  * from ptr.
 690  */
 691 static size_t rpc_in(char *ptr, size_t eltsize,
 692                 size_t nmemb, void *buffer_)
 693 {
 694         size_t size = eltsize * nmemb;
 695         struct rpc_in_data *data = buffer_;
 696         long response_code;
 697
 698         if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
 699                               &response_code) != CURLE_OK)
 700                 return size;
 701         if (response_code >= 300)
 702                 return size;
 703         if (size)
 704                 data->rpc->any_written = 1;
 705         write_or_die(data->rpc->in, ptr, size);
 706         return size;
 707 }
 708
 709 static int run_slot(struct active_request_slot *slot,
 710                     struct slot_results *results)
 711 {
 712         int err;
 713         struct slot_results results_buf;
 714
 715         if (!results)
 716                 results = &results_buf;
 717
 718         err = run_one_slot(slot, results);
 719
 720         if (err != HTTP_OK && err != HTTP_REAUTH) {
 721                 struct strbuf msg = STRBUF_INIT;
 722                 if (results->http_code && results->http_code != 200)
 723                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 724                 if (results->curl_result != CURLE_OK) {
 725                         if (msg.len)
 726                                 strbuf_addch(&msg, ' ');
 727                         strbuf_addf(&msg, "curl %d", results->curl_result);
 728                         if (curl_errorstr[0]) {
 729                                 strbuf_addch(&msg, ' ');
 730                                 strbuf_addstr(&msg, curl_errorstr);
 731                         }
 732                 }
 733                 error(_("RPC failed; %s"), msg.buf);
 734                 strbuf_release(&msg);
 735         }
 736
 737         return err;
 738 }
 739
 740 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 741 {
 742         struct active_request_slot *slot;
 743         struct curl_slist *headers = http_copy_default_headers();
 744         struct strbuf buf = STRBUF_INIT;
 745         int err;
 746
 747         slot = get_active_slot();
 748
 749         headers = curl_slist_append(headers, rpc->hdr_content_type);
 750         headers = curl_slist_append(headers, rpc->hdr_accept);
 751
 752         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 753         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 754         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 755         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 756         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 757         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 758         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 759         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 760         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 761
 762         err = run_slot(slot, results);
 763
 764         curl_slist_free_all(headers);
 765         strbuf_release(&buf);
 766         return err;
 767 }
 768
 769 static curl_off_t xcurl_off_t(size_t len)
 770 {
 771         uintmax_t size = len;
 772         if (size > maximum_signed_value_of_type(curl_off_t))
 773                 die(_("cannot handle pushes this big"));
 774         return (curl_off_t)size;
 775 }
 776
 777 /*
 778  * If flush_received is true, do not attempt to read any more; just use what's
 779  * in rpc->buf.
 780  */
 781 static int post_rpc(struct rpc_state *rpc, int flush_received)
 782 {
 783         struct active_request_slot *slot;
 784         struct curl_slist *headers = http_copy_default_headers();
 785         int use_gzip = rpc->gzip_request;
 786         char *gzip_body = NULL;
 787         size_t gzip_size = 0;
 788         int err, large_request = 0;
 789         int needs_100_continue = 0;
 790         struct rpc_in_data rpc_in_data;
 791
 792         /* Try to load the entire request, if we can fit it into the
 793          * allocated buffer space we can use HTTP/1.0 and avoid the
 794          * chunked encoding mess.
 795          */
 796         if (!flush_received) {
 797                 while (1) {
 798                         size_t n;
 799                         enum packet_read_status status;
 800
 801                         if (!rpc_read_from_out(rpc, 0, &n, &status)) {
 802                                 large_request = 1;
 803                                 use_gzip = 0;
 804                                 break;
 805                         }
 806                         if (status == PACKET_READ_FLUSH)
 807                                 break;
 808                 }
 809         }
 810
 811         if (large_request) {
 812                 struct slot_results results;
 813
 814                 do {
 815                         err = probe_rpc(rpc, &results);
 816                         if (err == HTTP_REAUTH)
 817                                 credential_fill(&http_auth);
 818                 } while (err == HTTP_REAUTH);
 819                 if (err != HTTP_OK)
 820                         return -1;
 821
 822                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 823                         needs_100_continue = 1;
 824         }
 825
 826         headers = curl_slist_append(headers, rpc->hdr_content_type);
 827         headers = curl_slist_append(headers, rpc->hdr_accept);
 828         headers = curl_slist_append(headers, needs_100_continue ?
 829                 "Expect: 100-continue" : "Expect:");
 830
 831         /* Add the extra Git-Protocol header */
 832         if (rpc->protocol_header)
 833                 headers = curl_slist_append(headers, rpc->protocol_header);
 834
 835 retry:
 836         slot = get_active_slot();
 837
 838         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 839         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 840         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 841         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 842
 843         if (large_request) {
 844                 /* The request body is large and the size cannot be predicted.
 845                  * We must use chunked encoding to send it.
 846                  */
 847                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 848                 rpc->initial_buffer = 1;
 849                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 850                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 851 #ifndef NO_CURL_IOCTL
 852                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 853                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 854 #endif
 855                 if (options.verbosity > 1) {
 856                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 857                         fflush(stderr);
 858                 }
 859
 860         } else if (gzip_body) {
 861                 /*
 862                  * If we are looping to retry authentication, then the previous
 863                  * run will have set up the headers and gzip buffer already,
 864                  * and we just need to send it.
 865                  */
 866                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 867                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 868
 869         } else if (use_gzip && 1024 < rpc->len) {
 870                 /* The client backend isn't giving us compressed data so
 871                  * we can try to deflate it ourselves, this may save on
 872                  * the transfer time.
 873                  */
 874                 git_zstream stream;
 875                 int ret;
 876
 877                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 878                 gzip_size = git_deflate_bound(&stream, rpc->len);
 879                 gzip_body = xmalloc(gzip_size);
 880
 881                 stream.next_in = (unsigned char *)rpc->buf;
 882                 stream.avail_in = rpc->len;
 883                 stream.next_out = (unsigned char *)gzip_body;
 884                 stream.avail_out = gzip_size;
 885
 886                 ret = git_deflate(&stream, Z_FINISH);
 887                 if (ret != Z_STREAM_END)
 888                         die(_("cannot deflate request; zlib deflate error %d"), ret);
 889
 890                 ret = git_deflate_end_gently(&stream);
 891                 if (ret != Z_OK)
 892                         die(_("cannot deflate request; zlib end error %d"), ret);
 893
 894                 gzip_size = stream.total_out;
 895
 896                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 897                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 898                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 899
 900                 if (options.verbosity > 1) {
 901                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 902                                 rpc->service_name,
 903                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 904                         fflush(stderr);
 905                 }
 906         } else {
 907                 /* We know the complete request size in advance, use the
 908                  * more normal Content-Length approach.
 909                  */
 910                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 911                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 912                 if (options.verbosity > 1) {
 913                         fprintf(stderr, "POST %s (%lu bytes)\n",
 914                                 rpc->service_name, (unsigned long)rpc->len);
 915                         fflush(stderr);
 916                 }
 917         }
 918
 919         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 920         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 921         rpc_in_data.rpc = rpc;
 922         rpc_in_data.slot = slot;
 923         curl_easy_setopt(slot->curl, CURLOPT_FILE, &rpc_in_data);
 924         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
 925
 926
 927         rpc->any_written = 0;
 928         err = run_slot(slot, NULL);
 929         if (err == HTTP_REAUTH && !large_request) {
 930                 credential_fill(&http_auth);
 931                 goto retry;
 932         }
 933         if (err != HTTP_OK)
 934                 err = -1;
 935
 936         if (!rpc->any_written)
 937                 err = -1;
 938
 939         curl_slist_free_all(headers);
 940         free(gzip_body);
 941         return err;
 942 }
 943
 944 static int rpc_service(struct rpc_state *rpc, struct discovery *heads,
 945                        const char **client_argv, const struct strbuf *preamble,
 946                        struct strbuf *rpc_result)
 947 {
 948         const char *svc = rpc->service_name;
 949         struct strbuf buf = STRBUF_INIT;
 950         struct child_process client = CHILD_PROCESS_INIT;
 951         int err = 0;
 952
 953         client.in = -1;
 954         client.out = -1;
 955         client.git_cmd = 1;
 956         client.argv = client_argv;
 957         if (start_command(&client))
 958                 exit(1);
 959         write_or_die(client.in, preamble->buf, preamble->len);
 960         if (heads)
 961                 write_or_die(client.in, heads->buf, heads->len);
 962
 963         rpc->alloc = http_post_buffer;
 964         rpc->buf = xmalloc(rpc->alloc);
 965         rpc->in = client.in;
 966         rpc->out = client.out;
 967
 968         strbuf_addf(&buf, "%s%s", url.buf, svc);
 969         rpc->service_url = strbuf_detach(&buf, NULL);
 970
 971         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 972         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 973
 974         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 975         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 976
 977         if (get_protocol_http_header(heads->version, &buf))
 978                 rpc->protocol_header = strbuf_detach(&buf, NULL);
 979         else
 980                 rpc->protocol_header = NULL;
 981
 982         while (!err) {
 983                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 984                 if (!n)
 985                         break;
 986                 rpc->pos = 0;
 987                 rpc->len = n;
 988                 err |= post_rpc(rpc, 0);
 989         }
 990
 991         close(client.in);
 992         client.in = -1;
 993         if (!err) {
 994                 strbuf_read(rpc_result, client.out, 0);
 995         } else {
 996                 char buf[4096];
 997                 for (;;)
 998                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 999                                 break;
1000         }
1001
1002         close(client.out);
1003         client.out = -1;
1004
1005         err |= finish_command(&client);
1006         free(rpc->service_url);
1007         free(rpc->hdr_content_type);
1008         free(rpc->hdr_accept);
1009         free(rpc->protocol_header);
1010         free(rpc->buf);
1011         strbuf_release(&buf);
1012         return err;
1013 }
1014
1015 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
1016 {
1017         struct walker *walker;
1018         char **targets;
1019         int ret, i;
1020
1021         ALLOC_ARRAY(targets, nr_heads);
1022         if (options.depth || options.deepen_since)
1023                 die(_("dumb http transport does not support shallow capabilities"));
1024         for (i = 0; i < nr_heads; i++)
1025                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
1026
1027         walker = get_http_walker(url.buf);
1028         walker->get_verbosely = options.verbosity >= 3;
1029         walker->get_recover = 0;
1030         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
1031         walker_free(walker);
1032
1033         for (i = 0; i < nr_heads; i++)
1034                 free(targets[i]);
1035         free(targets);
1036
1037         return ret ? error(_("fetch failed.")) : 0;
1038 }
1039
1040 static int fetch_git(struct discovery *heads,
1041         int nr_heads, struct ref **to_fetch)
1042 {
1043         struct rpc_state rpc;
1044         struct strbuf preamble = STRBUF_INIT;
1045         int i, err;
1046         struct argv_array args = ARGV_ARRAY_INIT;
1047         struct strbuf rpc_result = STRBUF_INIT;
1048
1049         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
1050                          "--stdin", "--lock-pack", NULL);
1051         if (options.followtags)
1052                 argv_array_push(&args, "--include-tag");
1053         if (options.thin)
1054                 argv_array_push(&args, "--thin");
1055         if (options.verbosity >= 3)
1056                 argv_array_pushl(&args, "-v", "-v", NULL);
1057         if (options.check_self_contained_and_connected)
1058                 argv_array_push(&args, "--check-self-contained-and-connected");
1059         if (options.cloning)
1060                 argv_array_push(&args, "--cloning");
1061         if (options.update_shallow)
1062                 argv_array_push(&args, "--update-shallow");
1063         if (!options.progress)
1064                 argv_array_push(&args, "--no-progress");
1065         if (options.depth)
1066                 argv_array_pushf(&args, "--depth=%lu", options.depth);
1067         if (options.deepen_since)
1068                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
1069         for (i = 0; i < options.deepen_not.nr; i++)
1070                 argv_array_pushf(&args, "--shallow-exclude=%s",
1071                                  options.deepen_not.items[i].string);
1072         if (options.deepen_relative && options.depth)
1073                 argv_array_push(&args, "--deepen-relative");
1074         if (options.from_promisor)
1075                 argv_array_push(&args, "--from-promisor");
1076         if (options.no_dependents)
1077                 argv_array_push(&args, "--no-dependents");
1078         if (options.filter)
1079                 argv_array_pushf(&args, "--filter=%s", options.filter);
1080         argv_array_push(&args, url.buf);
1081
1082         for (i = 0; i < nr_heads; i++) {
1083                 struct ref *ref = to_fetch[i];
1084                 if (!*ref->name)
1085                         die(_("cannot fetch by sha1 over smart http"));
1086                 packet_buf_write(&preamble, "%s %s\n",
1087                                  oid_to_hex(&ref->old_oid), ref->name);
1088         }
1089         packet_buf_flush(&preamble);
1090
1091         memset(&rpc, 0, sizeof(rpc));
1092         rpc.service_name = "git-upload-pack",
1093         rpc.gzip_request = 1;
1094
1095         err = rpc_service(&rpc, heads, args.argv, &preamble, &rpc_result);
1096         if (rpc_result.len)
1097                 write_or_die(1, rpc_result.buf, rpc_result.len);
1098         strbuf_release(&rpc_result);
1099         strbuf_release(&preamble);
1100         argv_array_clear(&args);
1101         return err;
1102 }
1103
1104 static int fetch(int nr_heads, struct ref **to_fetch)
1105 {
1106         struct discovery *d = discover_refs("git-upload-pack", 0);
1107         if (d->proto_git)
1108                 return fetch_git(d, nr_heads, to_fetch);
1109         else
1110                 return fetch_dumb(nr_heads, to_fetch);
1111 }
1112
1113 static void parse_fetch(struct strbuf *buf)
1114 {
1115         struct ref **to_fetch = NULL;
1116         struct ref *list_head = NULL;
1117         struct ref **list = &list_head;
1118         int alloc_heads = 0, nr_heads = 0;
1119
1120         do {
1121                 const char *p;
1122                 if (skip_prefix(buf->buf, "fetch ", &p)) {
1123                         const char *name;
1124                         struct ref *ref;
1125                         struct object_id old_oid;
1126                         const char *q;
1127
1128                         if (parse_oid_hex(p, &old_oid, &q))
1129                                 die(_("protocol error: expected sha/ref, got '%s'"), p);
1130                         if (*q == ' ')
1131                                 name = q + 1;
1132                         else if (!*q)
1133                                 name = "";
1134                         else
1135                                 die(_("protocol error: expected sha/ref, got '%s'"), p);
1136
1137                         ref = alloc_ref(name);
1138                         oidcpy(&ref->old_oid, &old_oid);
1139
1140                         *list = ref;
1141                         list = &ref->next;
1142
1143                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1144                         to_fetch[nr_heads++] = ref;
1145                 }
1146                 else
1147                         die(_("http transport does not support %s"), buf->buf);
1148
1149                 strbuf_reset(buf);
1150                 if (strbuf_getline_lf(buf, stdin) == EOF)
1151                         return;
1152                 if (!*buf->buf)
1153                         break;
1154         } while (1);
1155
1156         if (fetch(nr_heads, to_fetch))
1157                 exit(128); /* error already reported */
1158         free_refs(list_head);
1159         free(to_fetch);
1160
1161         printf("\n");
1162         fflush(stdout);
1163         strbuf_reset(buf);
1164 }
1165
1166 static int push_dav(int nr_spec, const char **specs)
1167 {
1168         struct child_process child = CHILD_PROCESS_INIT;
1169         size_t i;
1170
1171         child.git_cmd = 1;
1172         argv_array_push(&child.args, "http-push");
1173         argv_array_push(&child.args, "--helper-status");
1174         if (options.dry_run)
1175                 argv_array_push(&child.args, "--dry-run");
1176         if (options.verbosity > 1)
1177                 argv_array_push(&child.args, "--verbose");
1178         argv_array_push(&child.args, url.buf);
1179         for (i = 0; i < nr_spec; i++)
1180                 argv_array_push(&child.args, specs[i]);
1181
1182         if (run_command(&child))
1183                 die(_("git-http-push failed"));
1184         return 0;
1185 }
1186
1187 static int push_git(struct discovery *heads, int nr_spec, const char **specs)
1188 {
1189         struct rpc_state rpc;
1190         int i, err;
1191         struct argv_array args;
1192         struct string_list_item *cas_option;
1193         struct strbuf preamble = STRBUF_INIT;
1194         struct strbuf rpc_result = STRBUF_INIT;
1195
1196         argv_array_init(&args);
1197         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1198                          NULL);
1199
1200         if (options.thin)
1201                 argv_array_push(&args, "--thin");
1202         if (options.dry_run)
1203                 argv_array_push(&args, "--dry-run");
1204         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1205                 argv_array_push(&args, "--signed=yes");
1206         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1207                 argv_array_push(&args, "--signed=if-asked");
1208         if (options.atomic)
1209                 argv_array_push(&args, "--atomic");
1210         if (options.verbosity == 0)
1211                 argv_array_push(&args, "--quiet");
1212         else if (options.verbosity > 1)
1213                 argv_array_push(&args, "--verbose");
1214         for (i = 0; i < options.push_options.nr; i++)
1215                 argv_array_pushf(&args, "--push-option=%s",
1216                                  options.push_options.items[i].string);
1217         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1218         for_each_string_list_item(cas_option, &cas_options)
1219                 argv_array_push(&args, cas_option->string);
1220         argv_array_push(&args, url.buf);
1221
1222         argv_array_push(&args, "--stdin");
1223         for (i = 0; i < nr_spec; i++)
1224                 packet_buf_write(&preamble, "%s\n", specs[i]);
1225         packet_buf_flush(&preamble);
1226
1227         memset(&rpc, 0, sizeof(rpc));
1228         rpc.service_name = "git-receive-pack",
1229
1230         err = rpc_service(&rpc, heads, args.argv, &preamble, &rpc_result);
1231         if (rpc_result.len)
1232                 write_or_die(1, rpc_result.buf, rpc_result.len);
1233         strbuf_release(&rpc_result);
1234         strbuf_release(&preamble);
1235         argv_array_clear(&args);
1236         return err;
1237 }
1238
1239 static int push(int nr_spec, const char **specs)
1240 {
1241         struct discovery *heads = discover_refs("git-receive-pack", 1);
1242         int ret;
1243
1244         if (heads->proto_git)
1245                 ret = push_git(heads, nr_spec, specs);
1246         else
1247                 ret = push_dav(nr_spec, specs);
1248         free_discovery(heads);
1249         return ret;
1250 }
1251
1252 static void parse_push(struct strbuf *buf)
1253 {
1254         struct argv_array specs = ARGV_ARRAY_INIT;
1255         int ret;
1256
1257         do {
1258                 if (starts_with(buf->buf, "push "))
1259                         argv_array_push(&specs, buf->buf + 5);
1260                 else
1261                         die(_("http transport does not support %s"), buf->buf);
1262
1263                 strbuf_reset(buf);
1264                 if (strbuf_getline_lf(buf, stdin) == EOF)
1265                         goto free_specs;
1266                 if (!*buf->buf)
1267                         break;
1268         } while (1);
1269
1270         ret = push(specs.argc, specs.argv);
1271         printf("\n");
1272         fflush(stdout);
1273
1274         if (ret)
1275                 exit(128); /* error already reported */
1276
1277  free_specs:
1278         argv_array_clear(&specs);
1279 }
1280
1281 static int stateless_connect(const char *service_name)
1282 {
1283         struct discovery *discover;
1284         struct rpc_state rpc;
1285         struct strbuf buf = STRBUF_INIT;
1286
1287         /*
1288          * Run the info/refs request and see if the server supports protocol
1289          * v2.  If and only if the server supports v2 can we successfully
1290          * establish a stateless connection, otherwise we need to tell the
1291          * client to fallback to using other transport helper functions to
1292          * complete their request.
1293          */
1294         discover = discover_refs(service_name, 0);
1295         if (discover->version != protocol_v2) {
1296                 printf("fallback\n");
1297                 fflush(stdout);
1298                 return -1;
1299         } else {
1300                 /* Stateless Connection established */
1301                 printf("\n");
1302                 fflush(stdout);
1303         }
1304
1305         rpc.service_name = service_name;
1306         rpc.service_url = xstrfmt("%s%s", url.buf, rpc.service_name);
1307         rpc.hdr_content_type = xstrfmt("Content-Type: application/x-%s-request", rpc.service_name);
1308         rpc.hdr_accept = xstrfmt("Accept: application/x-%s-result", rpc.service_name);
1309         if (get_protocol_http_header(discover->version, &buf)) {
1310                 rpc.protocol_header = strbuf_detach(&buf, NULL);
1311         } else {
1312                 rpc.protocol_header = NULL;
1313                 strbuf_release(&buf);
1314         }
1315         rpc.buf = xmalloc(http_post_buffer);
1316         rpc.alloc = http_post_buffer;
1317         rpc.len = 0;
1318         rpc.pos = 0;
1319         rpc.in = 1;
1320         rpc.out = 0;
1321         rpc.any_written = 0;
1322         rpc.gzip_request = 1;
1323         rpc.initial_buffer = 0;
1324         rpc.write_line_lengths = 1;
1325         rpc.flush_read_but_not_sent = 0;
1326
1327         /*
1328          * Dump the capability listing that we got from the server earlier
1329          * during the info/refs request.
1330          */
1331         write_or_die(rpc.in, discover->buf, discover->len);
1332
1333         /* Until we see EOF keep sending POSTs */
1334         while (1) {
1335                 size_t avail;
1336                 enum packet_read_status status;
1337
1338                 if (!rpc_read_from_out(&rpc, PACKET_READ_GENTLE_ON_EOF, &avail,
1339                                        &status))
1340                         BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
1341                 if (status == PACKET_READ_EOF)
1342                         break;
1343                 if (post_rpc(&rpc, status == PACKET_READ_FLUSH))
1344                         /* We would have an err here */
1345                         break;
1346                 /* Reset the buffer for next request */
1347                 rpc.len = 0;
1348         }
1349
1350         free(rpc.service_url);
1351         free(rpc.hdr_content_type);
1352         free(rpc.hdr_accept);
1353         free(rpc.protocol_header);
1354         free(rpc.buf);
1355         strbuf_release(&buf);
1356
1357         return 0;
1358 }
1359
1360 int cmd_main(int argc, const char **argv)
1361 {
1362         struct strbuf buf = STRBUF_INIT;
1363         int nongit;
1364
1365         setup_git_directory_gently(&nongit);
1366         if (argc < 2) {
1367                 error(_("remote-curl: usage: git remote-curl <remote> [<url>]"));
1368                 return 1;
1369         }
1370
1371         options.verbosity = 1;
1372         options.progress = !!isatty(2);
1373         options.thin = 1;
1374         string_list_init(&options.deepen_not, 1);
1375         string_list_init(&options.push_options, 1);
1376
1377         /*
1378          * Just report "remote-curl" here (folding all the various aliases
1379          * ("git-remote-http", "git-remote-https", and etc.) here since they
1380          * are all just copies of the same actual executable.
1381          */
1382         trace2_cmd_name("remote-curl");
1383
1384         remote = remote_get(argv[1]);
1385
1386         if (argc > 2) {
1387                 end_url_with_slash(&url, argv[2]);
1388         } else {
1389                 end_url_with_slash(&url, remote->url[0]);
1390         }
1391
1392         http_init(remote, url.buf, 0);
1393
1394         do {
1395                 const char *arg;
1396
1397                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1398                         if (ferror(stdin))
1399                                 error(_("remote-curl: error reading command stream from git"));
1400                         return 1;
1401                 }
1402                 if (buf.len == 0)
1403                         break;
1404                 if (starts_with(buf.buf, "fetch ")) {
1405                         if (nongit)
1406                                 die(_("remote-curl: fetch attempted without a local repo"));
1407                         parse_fetch(&buf);
1408
1409                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1410                         int for_push = !!strstr(buf.buf + 4, "for-push");
1411                         output_refs(get_refs(for_push));
1412
1413                 } else if (starts_with(buf.buf, "push ")) {
1414                         parse_push(&buf);
1415
1416                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1417                         char *value = strchr(arg, ' ');
1418                         int result;
1419
1420                         if (value)
1421                                 *value++ = '\0';
1422                         else
1423                                 value = "true";
1424
1425                         result = set_option(arg, value);
1426                         if (!result)
1427                                 printf("ok\n");
1428                         else if (result < 0)
1429                                 printf("error invalid value\n");
1430                         else
1431                                 printf("unsupported\n");
1432                         fflush(stdout);
1433
1434                 } else if (!strcmp(buf.buf, "capabilities")) {
1435                         printf("stateless-connect\n");
1436                         printf("fetch\n");
1437                         printf("option\n");
1438                         printf("push\n");
1439                         printf("check-connectivity\n");
1440                         printf("\n");
1441                         fflush(stdout);
1442                 } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1443                         if (!stateless_connect(arg))
1444                                 break;
1445                 } else {
1446                         error(_("remote-curl: unknown command '%s' from git"), buf.buf);
1447                         return 1;
1448                 }
1449                 strbuf_reset(&buf);
1450         } while (1);
1451
1452         http_cleanup();
1453
1454         return 0;
1455 }