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