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