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
  20 static struct remote *remote;
  21 /* always ends with a trailing slash */
  22 static struct strbuf url = STRBUF_INIT;
  23
  24 struct options {
  25         int verbosity;
  26         unsigned long depth;
  27         char *deepen_since;
  28         struct string_list deepen_not;
  29         struct string_list push_options;
  30         char *filter;
  31         unsigned progress : 1,
  32                 check_self_contained_and_connected : 1,
  33                 cloning : 1,
  34                 update_shallow : 1,
  35                 followtags : 1,
  36                 dry_run : 1,
  37                 thin : 1,
  38                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
  39                 push_cert : 2,
  40                 deepen_relative : 1,
  41                 from_promisor : 1,
  42                 no_dependents : 1;
  43 };
  44 static struct options options;
  45 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  46
  47 static int set_option(const char *name, const char *value)
  48 {
  49         if (!strcmp(name, "verbosity")) {
  50                 char *end;
  51                 int v = strtol(value, &end, 10);
  52                 if (value == end || *end)
  53                         return -1;
  54                 options.verbosity = v;
  55                 return 0;
  56         }
  57         else if (!strcmp(name, "progress")) {
  58                 if (!strcmp(value, "true"))
  59                         options.progress = 1;
  60                 else if (!strcmp(value, "false"))
  61                         options.progress = 0;
  62                 else
  63                         return -1;
  64                 return 0;
  65         }
  66         else if (!strcmp(name, "depth")) {
  67                 char *end;
  68                 unsigned long v = strtoul(value, &end, 10);
  69                 if (value == end || *end)
  70                         return -1;
  71                 options.depth = v;
  72                 return 0;
  73         }
  74         else if (!strcmp(name, "deepen-since")) {
  75                 options.deepen_since = xstrdup(value);
  76                 return 0;
  77         }
  78         else if (!strcmp(name, "deepen-not")) {
  79                 string_list_append(&options.deepen_not, value);
  80                 return 0;
  81         }
  82         else if (!strcmp(name, "deepen-relative")) {
  83                 if (!strcmp(value, "true"))
  84                         options.deepen_relative = 1;
  85                 else if (!strcmp(value, "false"))
  86                         options.deepen_relative = 0;
  87                 else
  88                         return -1;
  89                 return 0;
  90         }
  91         else if (!strcmp(name, "followtags")) {
  92                 if (!strcmp(value, "true"))
  93                         options.followtags = 1;
  94                 else if (!strcmp(value, "false"))
  95                         options.followtags = 0;
  96                 else
  97                         return -1;
  98                 return 0;
  99         }
 100         else if (!strcmp(name, "dry-run")) {
 101                 if (!strcmp(value, "true"))
 102                         options.dry_run = 1;
 103                 else if (!strcmp(value, "false"))
 104                         options.dry_run = 0;
 105                 else
 106                         return -1;
 107                 return 0;
 108         }
 109         else if (!strcmp(name, "check-connectivity")) {
 110                 if (!strcmp(value, "true"))
 111                         options.check_self_contained_and_connected = 1;
 112                 else if (!strcmp(value, "false"))
 113                         options.check_self_contained_and_connected = 0;
 114                 else
 115                         return -1;
 116                 return 0;
 117         }
 118         else if (!strcmp(name, "cas")) {
 119                 struct strbuf val = STRBUF_INIT;
 120                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 121                 string_list_append(&cas_options, val.buf);
 122                 strbuf_release(&val);
 123                 return 0;
 124         } else if (!strcmp(name, "cloning")) {
 125                 if (!strcmp(value, "true"))
 126                         options.cloning = 1;
 127                 else if (!strcmp(value, "false"))
 128                         options.cloning = 0;
 129                 else
 130                         return -1;
 131                 return 0;
 132         } else if (!strcmp(name, "update-shallow")) {
 133                 if (!strcmp(value, "true"))
 134                         options.update_shallow = 1;
 135                 else if (!strcmp(value, "false"))
 136                         options.update_shallow = 0;
 137                 else
 138                         return -1;
 139                 return 0;
 140         } else if (!strcmp(name, "pushcert")) {
 141                 if (!strcmp(value, "true"))
 142                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 143                 else if (!strcmp(value, "false"))
 144                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 145                 else if (!strcmp(value, "if-asked"))
 146                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 147                 else
 148                         return -1;
 149                 return 0;
 150         } else if (!strcmp(name, "push-option")) {
 151                 if (*value != '"')
 152                         string_list_append(&options.push_options, value);
 153                 else {
 154                         struct strbuf unquoted = STRBUF_INIT;
 155                         if (unquote_c_style(&unquoted, value, NULL) < 0)
 156                                 die("invalid quoting in push-option value");
 157                         string_list_append_nodup(&options.push_options,
 158                                                  strbuf_detach(&unquoted, NULL));
 159                 }
 160                 return 0;
 161
 162 #if LIBCURL_VERSION_NUM >= 0x070a08
 163         } else if (!strcmp(name, "family")) {
 164                 if (!strcmp(value, "ipv4"))
 165                         git_curl_ipresolve = CURL_IPRESOLVE_V4;
 166                 else if (!strcmp(value, "ipv6"))
 167                         git_curl_ipresolve = CURL_IPRESOLVE_V6;
 168                 else if (!strcmp(value, "all"))
 169                         git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 170                 else
 171                         return -1;
 172                 return 0;
 173 #endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 174         } else if (!strcmp(name, "from-promisor")) {
 175                 options.from_promisor = 1;
 176                 return 0;
 177         } else if (!strcmp(name, "no-dependents")) {
 178                 options.no_dependents = 1;
 179                 return 0;
 180         } else if (!strcmp(name, "filter")) {
 181                 options.filter = xstrdup(value);
 182                 return 0;
 183         } else {
 184                 return 1 /* unsupported */;
 185         }
 186 }
 187
 188 struct discovery {
 189         char *service;
 190         char *buf_alloc;
 191         char *buf;
 192         size_t len;
 193         struct ref *refs;
 194         struct oid_array shallow;
 195         enum protocol_version version;
 196         unsigned proto_git : 1;
 197 };
 198 static struct discovery *last_discovery;
 199
 200 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 201 {
 202         struct ref *list = NULL;
 203         struct packet_reader reader;
 204
 205         packet_reader_init(&reader, -1, heads->buf, heads->len,
 206                            PACKET_READ_CHOMP_NEWLINE |
 207                            PACKET_READ_GENTLE_ON_EOF |
 208                            PACKET_READ_DIE_ON_ERR_PACKET);
 209
 210         heads->version = discover_version(&reader);
 211         switch (heads->version) {
 212         case protocol_v2:
 213                 /*
 214                  * Do nothing.  This isn't a list of refs but rather a
 215                  * capability advertisement.  Client would have run
 216                  * 'stateless-connect' so we'll dump this capability listing
 217                  * and let them request the refs themselves.
 218                  */
 219                 break;
 220         case protocol_v1:
 221         case protocol_v0:
 222                 get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
 223                                  NULL, &heads->shallow);
 224                 break;
 225         case protocol_unknown_version:
 226                 BUG("unknown protocol version");
 227         }
 228
 229         return list;
 230 }
 231
 232 static struct ref *parse_info_refs(struct discovery *heads)
 233 {
 234         char *data, *start, *mid;
 235         char *ref_name;
 236         int i = 0;
 237
 238         struct ref *refs = NULL;
 239         struct ref *ref = NULL;
 240         struct ref *last_ref = NULL;
 241
 242         data = heads->buf;
 243         start = NULL;
 244         mid = data;
 245         while (i < heads->len) {
 246                 if (!start) {
 247                         start = &data[i];
 248                 }
 249                 if (data[i] == '\t')
 250                         mid = &data[i];
 251                 if (data[i] == '\n') {
 252                         if (mid - start != 40)
 253                                 die("%sinfo/refs not valid: is this a git repository?",
 254                                     url.buf);
 255                         data[i] = 0;
 256                         ref_name = mid + 1;
 257                         ref = alloc_ref(ref_name);
 258                         get_oid_hex(start, &ref->old_oid);
 259                         if (!refs)
 260                                 refs = ref;
 261                         if (last_ref)
 262                                 last_ref->next = ref;
 263                         last_ref = ref;
 264                         start = NULL;
 265                 }
 266                 i++;
 267         }
 268
 269         ref = alloc_ref("HEAD");
 270         if (!http_fetch_ref(url.buf, ref) &&
 271             !resolve_remote_symref(ref, refs)) {
 272                 ref->next = refs;
 273                 refs = ref;
 274         } else {
 275                 free(ref);
 276         }
 277
 278         return refs;
 279 }
 280
 281 static void free_discovery(struct discovery *d)
 282 {
 283         if (d) {
 284                 if (d == last_discovery)
 285                         last_discovery = NULL;
 286                 free(d->shallow.oid);
 287                 free(d->buf_alloc);
 288                 free_refs(d->refs);
 289                 free(d->service);
 290                 free(d);
 291         }
 292 }
 293
 294 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 295                              struct strbuf *msg)
 296 {
 297         const char *p, *eol;
 298
 299         /*
 300          * We only show text/plain parts, as other types are likely
 301          * to be ugly to look at on the user's terminal.
 302          */
 303         if (strcmp(type->buf, "text/plain"))
 304                 return -1;
 305         if (charset->len)
 306                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 307
 308         strbuf_trim(msg);
 309         if (!msg->len)
 310                 return -1;
 311
 312         p = msg->buf;
 313         do {
 314                 eol = strchrnul(p, '\n');
 315                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 316                 p = eol + 1;
 317         } while(*eol);
 318         return 0;
 319 }
 320
 321 static int get_protocol_http_header(enum protocol_version version,
 322                                     struct strbuf *header)
 323 {
 324         if (version > 0) {
 325                 strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
 326                             version);
 327
 328                 return 1;
 329         }
 330
 331         return 0;
 332 }
 333
 334 static void check_smart_http(struct discovery *d, const char *service,
 335                              struct strbuf *type)
 336 {
 337         const char *p;
 338         struct packet_reader reader;
 339
 340         /*
 341          * If we don't see x-$service-advertisement, then it's not smart-http.
 342          * But once we do, we commit to it and assume any other protocol
 343          * violations are hard errors.
 344          */
 345         if (!skip_prefix(type->buf, "application/x-", &p) ||
 346             !skip_prefix(p, service, &p) ||
 347             strcmp(p, "-advertisement"))
 348                 return;
 349
 350         packet_reader_init(&reader, -1, d->buf, d->len,
 351                            PACKET_READ_CHOMP_NEWLINE |
 352                            PACKET_READ_DIE_ON_ERR_PACKET);
 353         if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
 354                 die("invalid server response; expected service, got flush packet");
 355
 356         if (skip_prefix(reader.line, "# service=", &p) && !strcmp(p, service)) {
 357                 /*
 358                  * The header can include additional metadata lines, up
 359                  * until a packet flush marker.  Ignore these now, but
 360                  * in the future we might start to scan them.
 361                  */
 362                 for (;;) {
 363                         packet_reader_read(&reader);
 364                         if (reader.pktlen <= 0) {
 365                                 break;
 366                         }
 367                 }
 368
 369                 /*
 370                  * v0 smart http; callers expect us to soak up the
 371                  * service and header packets
 372                  */
 373                 d->buf = reader.src_buffer;
 374                 d->len = reader.src_len;
 375                 d->proto_git = 1;
 376
 377         } else if (!strcmp(reader.line, "version 2")) {
 378                 /*
 379                  * v2 smart http; do not consume version packet, which will
 380                  * be handled elsewhere.
 381                  */
 382                 d->proto_git = 1;
 383
 384         } else {
 385                 die("invalid server response; got '%s'", reader.line);
 386         }
 387 }
 388
 389 static struct discovery *discover_refs(const char *service, int for_push)
 390 {
 391         struct strbuf type = STRBUF_INIT;
 392         struct strbuf charset = STRBUF_INIT;
 393         struct strbuf buffer = STRBUF_INIT;
 394         struct strbuf refs_url = STRBUF_INIT;
 395         struct strbuf effective_url = STRBUF_INIT;
 396         struct strbuf protocol_header = STRBUF_INIT;
 397         struct string_list extra_headers = STRING_LIST_INIT_DUP;
 398         struct discovery *last = last_discovery;
 399         int http_ret, maybe_smart = 0;
 400         struct http_get_options http_options;
 401         enum protocol_version version = get_protocol_version_config();
 402
 403         if (last && !strcmp(service, last->service))
 404                 return last;
 405         free_discovery(last);
 406
 407         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 408         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 409              git_env_bool("GIT_SMART_HTTP", 1)) {
 410                 maybe_smart = 1;
 411                 if (!strchr(url.buf, '?'))
 412                         strbuf_addch(&refs_url, '?');
 413                 else
 414                         strbuf_addch(&refs_url, '&');
 415                 strbuf_addf(&refs_url, "service=%s", service);
 416         }
 417
 418         /*
 419          * NEEDSWORK: If we are trying to use protocol v2 and we are planning
 420          * to perform a push, then fallback to v0 since the client doesn't know
 421          * how to push yet using v2.
 422          */
 423         if (version == protocol_v2 && !strcmp("git-receive-pack", service))
 424                 version = protocol_v0;
 425
 426         /* Add the extra Git-Protocol header */
 427         if (get_protocol_http_header(version, &protocol_header))
 428                 string_list_append(&extra_headers, protocol_header.buf);
 429
 430         memset(&http_options, 0, sizeof(http_options));
 431         http_options.content_type = &type;
 432         http_options.charset = &charset;
 433         http_options.effective_url = &effective_url;
 434         http_options.base_url = &url;
 435         http_options.extra_headers = &extra_headers;
 436         http_options.initial_request = 1;
 437         http_options.no_cache = 1;
 438
 439         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 440         switch (http_ret) {
 441         case HTTP_OK:
 442                 break;
 443         case HTTP_MISSING_TARGET:
 444                 show_http_message(&type, &charset, &buffer);
 445                 die("repository '%s' not found", url.buf);
 446         case HTTP_NOAUTH:
 447                 show_http_message(&type, &charset, &buffer);
 448                 die("Authentication failed for '%s'", url.buf);
 449         default:
 450                 show_http_message(&type, &charset, &buffer);
 451                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 452         }
 453
 454         if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 455                 warning(_("redirecting to %s"), url.buf);
 456
 457         last= xcalloc(1, sizeof(*last_discovery));
 458         last->service = xstrdup(service);
 459         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 460         last->buf = last->buf_alloc;
 461
 462         if (maybe_smart)
 463                 check_smart_http(last, service, &type);
 464
 465         if (last->proto_git)
 466                 last->refs = parse_git_refs(last, for_push);
 467         else
 468                 last->refs = parse_info_refs(last);
 469
 470         strbuf_release(&refs_url);
 471         strbuf_release(&type);
 472         strbuf_release(&charset);
 473         strbuf_release(&effective_url);
 474         strbuf_release(&buffer);
 475         strbuf_release(&protocol_header);
 476         string_list_clear(&extra_headers, 0);
 477         last_discovery = last;
 478         return last;
 479 }
 480
 481 static struct ref *get_refs(int for_push)
 482 {
 483         struct discovery *heads;
 484
 485         if (for_push)
 486                 heads = discover_refs("git-receive-pack", for_push);
 487         else
 488                 heads = discover_refs("git-upload-pack", for_push);
 489
 490         return heads->refs;
 491 }
 492
 493 static void output_refs(struct ref *refs)
 494 {
 495         struct ref *posn;
 496         for (posn = refs; posn; posn = posn->next) {
 497                 if (posn->symref)
 498                         printf("@%s %s\n", posn->symref, posn->name);
 499                 else
 500                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 501         }
 502         printf("\n");
 503         fflush(stdout);
 504 }
 505
 506 struct rpc_state {
 507         const char *service_name;
 508         char *service_url;
 509         char *hdr_content_type;
 510         char *hdr_accept;
 511         char *protocol_header;
 512         char *buf;
 513         size_t alloc;
 514         size_t len;
 515         size_t pos;
 516         int in;
 517         int out;
 518         int any_written;
 519         unsigned gzip_request : 1;
 520         unsigned initial_buffer : 1;
 521
 522         /*
 523          * Whenever a pkt-line is read into buf, append the 4 characters
 524          * denoting its length before appending the payload.
 525          */
 526         unsigned write_line_lengths : 1;
 527
 528         /*
 529          * Used by rpc_out; initialize to 0. This is true if a flush has been
 530          * read, but the corresponding line length (if write_line_lengths is
 531          * true) and EOF have not been sent to libcurl. Since each flush marks
 532          * the end of a request, each flush must be completely sent before any
 533          * further reading occurs.
 534          */
 535         unsigned flush_read_but_not_sent : 1;
 536 };
 537
 538 /*
 539  * Appends the result of reading from rpc->out to the string represented by
 540  * rpc->buf and rpc->len if there is enough space. Returns 1 if there was
 541  * enough space, 0 otherwise.
 542  *
 543  * If rpc->write_line_lengths is true, appends the line length as a 4-byte
 544  * hexadecimal string before appending the result described above.
 545  *
 546  * Writes the total number of bytes appended into appended.
 547  */
 548 static int rpc_read_from_out(struct rpc_state *rpc, int options,
 549                              size_t *appended,
 550                              enum packet_read_status *status) {
 551         size_t left;
 552         char *buf;
 553         int pktlen_raw;
 554
 555         if (rpc->write_line_lengths) {
 556                 left = rpc->alloc - rpc->len - 4;
 557                 buf = rpc->buf + rpc->len + 4;
 558         } else {
 559                 left = rpc->alloc - rpc->len;
 560                 buf = rpc->buf + rpc->len;
 561         }
 562
 563         if (left < LARGE_PACKET_MAX)
 564                 return 0;
 565
 566         *status = packet_read_with_status(rpc->out, NULL, NULL, buf,
 567                         left, &pktlen_raw, options);
 568         if (*status != PACKET_READ_EOF) {
 569                 *appended = pktlen_raw + (rpc->write_line_lengths ? 4 : 0);
 570                 rpc->len += *appended;
 571         }
 572
 573         if (rpc->write_line_lengths) {
 574                 switch (*status) {
 575                 case PACKET_READ_EOF:
 576                         if (!(options & PACKET_READ_GENTLE_ON_EOF))
 577                                 die("shouldn't have EOF when not gentle on EOF");
 578                         break;
 579                 case PACKET_READ_NORMAL:
 580                         set_packet_header(buf - 4, *appended);
 581                         break;
 582                 case PACKET_READ_DELIM:
 583                         memcpy(buf - 4, "0001", 4);
 584                         break;
 585                 case PACKET_READ_FLUSH:
 586                         memcpy(buf - 4, "0000", 4);
 587                         break;
 588                 }
 589         }
 590
 591         return 1;
 592 }
 593
 594 static size_t rpc_out(void *ptr, size_t eltsize,
 595                 size_t nmemb, void *buffer_)
 596 {
 597         size_t max = eltsize * nmemb;
 598         struct rpc_state *rpc = buffer_;
 599         size_t avail = rpc->len - rpc->pos;
 600         enum packet_read_status status;
 601
 602         if (!avail) {
 603                 rpc->initial_buffer = 0;
 604                 rpc->len = 0;
 605                 rpc->pos = 0;
 606                 if (!rpc->flush_read_but_not_sent) {
 607                         if (!rpc_read_from_out(rpc, 0, &avail, &status))
 608                                 BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
 609                         if (status == PACKET_READ_FLUSH)
 610                                 rpc->flush_read_but_not_sent = 1;
 611                 }
 612                 /*
 613                  * If flush_read_but_not_sent is true, we have already read one
 614                  * full request but have not fully sent it + EOF, which is why
 615                  * we need to refrain from reading.
 616                  */
 617         }
 618         if (rpc->flush_read_but_not_sent) {
 619                 if (!avail) {
 620                         /*
 621                          * The line length either does not need to be sent at
 622                          * all or has already been completely sent. Now we can
 623                          * return 0, indicating EOF, meaning that the flush has
 624                          * been fully sent.
 625                          */
 626                         rpc->flush_read_but_not_sent = 0;
 627                         return 0;
 628                 }
 629                 /*
 630                  * If avail is non-zerp, the line length for the flush still
 631                  * hasn't been fully sent. Proceed with sending the line
 632                  * length.
 633                  */
 634         }
 635
 636         if (max < avail)
 637                 avail = max;
 638         memcpy(ptr, rpc->buf + rpc->pos, avail);
 639         rpc->pos += avail;
 640         return avail;
 641 }
 642
 643 #ifndef NO_CURL_IOCTL
 644 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 645 {
 646         struct rpc_state *rpc = clientp;
 647
 648         switch (cmd) {
 649         case CURLIOCMD_NOP:
 650                 return CURLIOE_OK;
 651
 652         case CURLIOCMD_RESTARTREAD:
 653                 if (rpc->initial_buffer) {
 654                         rpc->pos = 0;
 655                         return CURLIOE_OK;
 656                 }
 657                 error("unable to rewind rpc post data - try increasing http.postBuffer");
 658                 return CURLIOE_FAILRESTART;
 659
 660         default:
 661                 return CURLIOE_UNKNOWNCMD;
 662         }
 663 }
 664 #endif
 665
 666 struct rpc_in_data {
 667         struct rpc_state *rpc;
 668         struct active_request_slot *slot;
 669 };
 670
 671 /*
 672  * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
 673  * from ptr.
 674  */
 675 static size_t rpc_in(char *ptr, size_t eltsize,
 676                 size_t nmemb, void *buffer_)
 677 {
 678         size_t size = eltsize * nmemb;
 679         struct rpc_in_data *data = buffer_;
 680         long response_code;
 681
 682         if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
 683                               &response_code) != CURLE_OK)
 684                 return size;
 685         if (response_code >= 300)
 686                 return size;
 687         if (size)
 688                 data->rpc->any_written = 1;
 689         write_or_die(data->rpc->in, ptr, size);
 690         return size;
 691 }
 692
 693 static int run_slot(struct active_request_slot *slot,
 694                     struct slot_results *results)
 695 {
 696         int err;
 697         struct slot_results results_buf;
 698
 699         if (!results)
 700                 results = &results_buf;
 701
 702         err = run_one_slot(slot, results);
 703
 704         if (err != HTTP_OK && err != HTTP_REAUTH) {
 705                 struct strbuf msg = STRBUF_INIT;
 706                 if (results->http_code && results->http_code != 200)
 707                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 708                 if (results->curl_result != CURLE_OK) {
 709                         if (msg.len)
 710                                 strbuf_addch(&msg, ' ');
 711                         strbuf_addf(&msg, "curl %d", results->curl_result);
 712                         if (curl_errorstr[0]) {
 713                                 strbuf_addch(&msg, ' ');
 714                                 strbuf_addstr(&msg, curl_errorstr);
 715                         }
 716                 }
 717                 error("RPC failed; %s", msg.buf);
 718                 strbuf_release(&msg);
 719         }
 720
 721         return err;
 722 }
 723
 724 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 725 {
 726         struct active_request_slot *slot;
 727         struct curl_slist *headers = http_copy_default_headers();
 728         struct strbuf buf = STRBUF_INIT;
 729         int err;
 730
 731         slot = get_active_slot();
 732
 733         headers = curl_slist_append(headers, rpc->hdr_content_type);
 734         headers = curl_slist_append(headers, rpc->hdr_accept);
 735
 736         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 737         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 738         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 739         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 740         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 741         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 742         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 743         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 744         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 745
 746         err = run_slot(slot, results);
 747
 748         curl_slist_free_all(headers);
 749         strbuf_release(&buf);
 750         return err;
 751 }
 752
 753 static curl_off_t xcurl_off_t(size_t len)
 754 {
 755         uintmax_t size = len;
 756         if (size > maximum_signed_value_of_type(curl_off_t))
 757                 die("cannot handle pushes this big");
 758         return (curl_off_t)size;
 759 }
 760
 761 /*
 762  * If flush_received is true, do not attempt to read any more; just use what's
 763  * in rpc->buf.
 764  */
 765 static int post_rpc(struct rpc_state *rpc, int flush_received)
 766 {
 767         struct active_request_slot *slot;
 768         struct curl_slist *headers = http_copy_default_headers();
 769         int use_gzip = rpc->gzip_request;
 770         char *gzip_body = NULL;
 771         size_t gzip_size = 0;
 772         int err, large_request = 0;
 773         int needs_100_continue = 0;
 774         struct rpc_in_data rpc_in_data;
 775
 776         /* Try to load the entire request, if we can fit it into the
 777          * allocated buffer space we can use HTTP/1.0 and avoid the
 778          * chunked encoding mess.
 779          */
 780         if (!flush_received) {
 781                 while (1) {
 782                         size_t n;
 783                         enum packet_read_status status;
 784
 785                         if (!rpc_read_from_out(rpc, 0, &n, &status)) {
 786                                 large_request = 1;
 787                                 use_gzip = 0;
 788                                 break;
 789                         }
 790                         if (status == PACKET_READ_FLUSH)
 791                                 break;
 792                 }
 793         }
 794
 795         if (large_request) {
 796                 struct slot_results results;
 797
 798                 do {
 799                         err = probe_rpc(rpc, &results);
 800                         if (err == HTTP_REAUTH)
 801                                 credential_fill(&http_auth);
 802                 } while (err == HTTP_REAUTH);
 803                 if (err != HTTP_OK)
 804                         return -1;
 805
 806                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 807                         needs_100_continue = 1;
 808         }
 809
 810         headers = curl_slist_append(headers, rpc->hdr_content_type);
 811         headers = curl_slist_append(headers, rpc->hdr_accept);
 812         headers = curl_slist_append(headers, needs_100_continue ?
 813                 "Expect: 100-continue" : "Expect:");
 814
 815         /* Add the extra Git-Protocol header */
 816         if (rpc->protocol_header)
 817                 headers = curl_slist_append(headers, rpc->protocol_header);
 818
 819 retry:
 820         slot = get_active_slot();
 821
 822         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 823         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 824         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 825         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 826
 827         if (large_request) {
 828                 /* The request body is large and the size cannot be predicted.
 829                  * We must use chunked encoding to send it.
 830                  */
 831                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 832                 rpc->initial_buffer = 1;
 833                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 834                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 835 #ifndef NO_CURL_IOCTL
 836                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 837                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 838 #endif
 839                 if (options.verbosity > 1) {
 840                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 841                         fflush(stderr);
 842                 }
 843
 844         } else if (gzip_body) {
 845                 /*
 846                  * If we are looping to retry authentication, then the previous
 847                  * run will have set up the headers and gzip buffer already,
 848                  * and we just need to send it.
 849                  */
 850                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 851                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 852
 853         } else if (use_gzip && 1024 < rpc->len) {
 854                 /* The client backend isn't giving us compressed data so
 855                  * we can try to deflate it ourselves, this may save on
 856                  * the transfer time.
 857                  */
 858                 git_zstream stream;
 859                 int ret;
 860
 861                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 862                 gzip_size = git_deflate_bound(&stream, rpc->len);
 863                 gzip_body = xmalloc(gzip_size);
 864
 865                 stream.next_in = (unsigned char *)rpc->buf;
 866                 stream.avail_in = rpc->len;
 867                 stream.next_out = (unsigned char *)gzip_body;
 868                 stream.avail_out = gzip_size;
 869
 870                 ret = git_deflate(&stream, Z_FINISH);
 871                 if (ret != Z_STREAM_END)
 872                         die("cannot deflate request; zlib deflate error %d", ret);
 873
 874                 ret = git_deflate_end_gently(&stream);
 875                 if (ret != Z_OK)
 876                         die("cannot deflate request; zlib end error %d", ret);
 877
 878                 gzip_size = stream.total_out;
 879
 880                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 881                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 882                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 883
 884                 if (options.verbosity > 1) {
 885                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 886                                 rpc->service_name,
 887                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 888                         fflush(stderr);
 889                 }
 890         } else {
 891                 /* We know the complete request size in advance, use the
 892                  * more normal Content-Length approach.
 893                  */
 894                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 895                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 896                 if (options.verbosity > 1) {
 897                         fprintf(stderr, "POST %s (%lu bytes)\n",
 898                                 rpc->service_name, (unsigned long)rpc->len);
 899                         fflush(stderr);
 900                 }
 901         }
 902
 903         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 904         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 905         rpc_in_data.rpc = rpc;
 906         rpc_in_data.slot = slot;
 907         curl_easy_setopt(slot->curl, CURLOPT_FILE, &rpc_in_data);
 908         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
 909
 910
 911         rpc->any_written = 0;
 912         err = run_slot(slot, NULL);
 913         if (err == HTTP_REAUTH && !large_request) {
 914                 credential_fill(&http_auth);
 915                 goto retry;
 916         }
 917         if (err != HTTP_OK)
 918                 err = -1;
 919
 920         if (!rpc->any_written)
 921                 err = -1;
 922
 923         curl_slist_free_all(headers);
 924         free(gzip_body);
 925         return err;
 926 }
 927
 928 static int rpc_service(struct rpc_state *rpc, struct discovery *heads,
 929                        const char **client_argv, const struct strbuf *preamble,
 930                        struct strbuf *rpc_result)
 931 {
 932         const char *svc = rpc->service_name;
 933         struct strbuf buf = STRBUF_INIT;
 934         struct child_process client = CHILD_PROCESS_INIT;
 935         int err = 0;
 936
 937         client.in = -1;
 938         client.out = -1;
 939         client.git_cmd = 1;
 940         client.argv = client_argv;
 941         if (start_command(&client))
 942                 exit(1);
 943         write_or_die(client.in, preamble->buf, preamble->len);
 944         if (heads)
 945                 write_or_die(client.in, heads->buf, heads->len);
 946
 947         rpc->alloc = http_post_buffer;
 948         rpc->buf = xmalloc(rpc->alloc);
 949         rpc->in = client.in;
 950         rpc->out = client.out;
 951
 952         strbuf_addf(&buf, "%s%s", url.buf, svc);
 953         rpc->service_url = strbuf_detach(&buf, NULL);
 954
 955         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 956         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 957
 958         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 959         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 960
 961         if (get_protocol_http_header(heads->version, &buf))
 962                 rpc->protocol_header = strbuf_detach(&buf, NULL);
 963         else
 964                 rpc->protocol_header = NULL;
 965
 966         while (!err) {
 967                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 968                 if (!n)
 969                         break;
 970                 rpc->pos = 0;
 971                 rpc->len = n;
 972                 err |= post_rpc(rpc, 0);
 973         }
 974
 975         close(client.in);
 976         client.in = -1;
 977         if (!err) {
 978                 strbuf_read(rpc_result, client.out, 0);
 979         } else {
 980                 char buf[4096];
 981                 for (;;)
 982                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 983                                 break;
 984         }
 985
 986         close(client.out);
 987         client.out = -1;
 988
 989         err |= finish_command(&client);
 990         free(rpc->service_url);
 991         free(rpc->hdr_content_type);
 992         free(rpc->hdr_accept);
 993         free(rpc->protocol_header);
 994         free(rpc->buf);
 995         strbuf_release(&buf);
 996         return err;
 997 }
 998
 999 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
1000 {
1001         struct walker *walker;
1002         char **targets;
1003         int ret, i;
1004
1005         ALLOC_ARRAY(targets, nr_heads);
1006         if (options.depth || options.deepen_since)
1007                 die("dumb http transport does not support shallow capabilities");
1008         for (i = 0; i < nr_heads; i++)
1009                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
1010
1011         walker = get_http_walker(url.buf);
1012         walker->get_verbosely = options.verbosity >= 3;
1013         walker->get_recover = 0;
1014         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
1015         walker_free(walker);
1016
1017         for (i = 0; i < nr_heads; i++)
1018                 free(targets[i]);
1019         free(targets);
1020
1021         return ret ? error("fetch failed.") : 0;
1022 }
1023
1024 static int fetch_git(struct discovery *heads,
1025         int nr_heads, struct ref **to_fetch)
1026 {
1027         struct rpc_state rpc;
1028         struct strbuf preamble = STRBUF_INIT;
1029         int i, err;
1030         struct argv_array args = ARGV_ARRAY_INIT;
1031         struct strbuf rpc_result = STRBUF_INIT;
1032
1033         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
1034                          "--stdin", "--lock-pack", NULL);
1035         if (options.followtags)
1036                 argv_array_push(&args, "--include-tag");
1037         if (options.thin)
1038                 argv_array_push(&args, "--thin");
1039         if (options.verbosity >= 3)
1040                 argv_array_pushl(&args, "-v", "-v", NULL);
1041         if (options.check_self_contained_and_connected)
1042                 argv_array_push(&args, "--check-self-contained-and-connected");
1043         if (options.cloning)
1044                 argv_array_push(&args, "--cloning");
1045         if (options.update_shallow)
1046                 argv_array_push(&args, "--update-shallow");
1047         if (!options.progress)
1048                 argv_array_push(&args, "--no-progress");
1049         if (options.depth)
1050                 argv_array_pushf(&args, "--depth=%lu", options.depth);
1051         if (options.deepen_since)
1052                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
1053         for (i = 0; i < options.deepen_not.nr; i++)
1054                 argv_array_pushf(&args, "--shallow-exclude=%s",
1055                                  options.deepen_not.items[i].string);
1056         if (options.deepen_relative && options.depth)
1057                 argv_array_push(&args, "--deepen-relative");
1058         if (options.from_promisor)
1059                 argv_array_push(&args, "--from-promisor");
1060         if (options.no_dependents)
1061                 argv_array_push(&args, "--no-dependents");
1062         if (options.filter)
1063                 argv_array_pushf(&args, "--filter=%s", options.filter);
1064         argv_array_push(&args, url.buf);
1065
1066         for (i = 0; i < nr_heads; i++) {
1067                 struct ref *ref = to_fetch[i];
1068                 if (!*ref->name)
1069                         die("cannot fetch by sha1 over smart http");
1070                 packet_buf_write(&preamble, "%s %s\n",
1071                                  oid_to_hex(&ref->old_oid), ref->name);
1072         }
1073         packet_buf_flush(&preamble);
1074
1075         memset(&rpc, 0, sizeof(rpc));
1076         rpc.service_name = "git-upload-pack",
1077         rpc.gzip_request = 1;
1078
1079         err = rpc_service(&rpc, heads, args.argv, &preamble, &rpc_result);
1080         if (rpc_result.len)
1081                 write_or_die(1, rpc_result.buf, rpc_result.len);
1082         strbuf_release(&rpc_result);
1083         strbuf_release(&preamble);
1084         argv_array_clear(&args);
1085         return err;
1086 }
1087
1088 static int fetch(int nr_heads, struct ref **to_fetch)
1089 {
1090         struct discovery *d = discover_refs("git-upload-pack", 0);
1091         if (d->proto_git)
1092                 return fetch_git(d, nr_heads, to_fetch);
1093         else
1094                 return fetch_dumb(nr_heads, to_fetch);
1095 }
1096
1097 static void parse_fetch(struct strbuf *buf)
1098 {
1099         struct ref **to_fetch = NULL;
1100         struct ref *list_head = NULL;
1101         struct ref **list = &list_head;
1102         int alloc_heads = 0, nr_heads = 0;
1103
1104         do {
1105                 const char *p;
1106                 if (skip_prefix(buf->buf, "fetch ", &p)) {
1107                         const char *name;
1108                         struct ref *ref;
1109                         struct object_id old_oid;
1110
1111                         if (get_oid_hex(p, &old_oid))
1112                                 die("protocol error: expected sha/ref, got %s'", p);
1113                         if (p[GIT_SHA1_HEXSZ] == ' ')
1114                                 name = p + GIT_SHA1_HEXSZ + 1;
1115                         else if (!p[GIT_SHA1_HEXSZ])
1116                                 name = "";
1117                         else
1118                                 die("protocol error: expected sha/ref, got %s'", p);
1119
1120                         ref = alloc_ref(name);
1121                         oidcpy(&ref->old_oid, &old_oid);
1122
1123                         *list = ref;
1124                         list = &ref->next;
1125
1126                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1127                         to_fetch[nr_heads++] = ref;
1128                 }
1129                 else
1130                         die("http transport does not support %s", buf->buf);
1131
1132                 strbuf_reset(buf);
1133                 if (strbuf_getline_lf(buf, stdin) == EOF)
1134                         return;
1135                 if (!*buf->buf)
1136                         break;
1137         } while (1);
1138
1139         if (fetch(nr_heads, to_fetch))
1140                 exit(128); /* error already reported */
1141         free_refs(list_head);
1142         free(to_fetch);
1143
1144         printf("\n");
1145         fflush(stdout);
1146         strbuf_reset(buf);
1147 }
1148
1149 static int push_dav(int nr_spec, char **specs)
1150 {
1151         struct child_process child = CHILD_PROCESS_INIT;
1152         size_t i;
1153
1154         child.git_cmd = 1;
1155         argv_array_push(&child.args, "http-push");
1156         argv_array_push(&child.args, "--helper-status");
1157         if (options.dry_run)
1158                 argv_array_push(&child.args, "--dry-run");
1159         if (options.verbosity > 1)
1160                 argv_array_push(&child.args, "--verbose");
1161         argv_array_push(&child.args, url.buf);
1162         for (i = 0; i < nr_spec; i++)
1163                 argv_array_push(&child.args, specs[i]);
1164
1165         if (run_command(&child))
1166                 die("git-http-push failed");
1167         return 0;
1168 }
1169
1170 static int push_git(struct discovery *heads, int nr_spec, char **specs)
1171 {
1172         struct rpc_state rpc;
1173         int i, err;
1174         struct argv_array args;
1175         struct string_list_item *cas_option;
1176         struct strbuf preamble = STRBUF_INIT;
1177         struct strbuf rpc_result = STRBUF_INIT;
1178
1179         argv_array_init(&args);
1180         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1181                          NULL);
1182
1183         if (options.thin)
1184                 argv_array_push(&args, "--thin");
1185         if (options.dry_run)
1186                 argv_array_push(&args, "--dry-run");
1187         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1188                 argv_array_push(&args, "--signed=yes");
1189         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1190                 argv_array_push(&args, "--signed=if-asked");
1191         if (options.verbosity == 0)
1192                 argv_array_push(&args, "--quiet");
1193         else if (options.verbosity > 1)
1194                 argv_array_push(&args, "--verbose");
1195         for (i = 0; i < options.push_options.nr; i++)
1196                 argv_array_pushf(&args, "--push-option=%s",
1197                                  options.push_options.items[i].string);
1198         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1199         for_each_string_list_item(cas_option, &cas_options)
1200                 argv_array_push(&args, cas_option->string);
1201         argv_array_push(&args, url.buf);
1202
1203         argv_array_push(&args, "--stdin");
1204         for (i = 0; i < nr_spec; i++)
1205                 packet_buf_write(&preamble, "%s\n", specs[i]);
1206         packet_buf_flush(&preamble);
1207
1208         memset(&rpc, 0, sizeof(rpc));
1209         rpc.service_name = "git-receive-pack",
1210
1211         err = rpc_service(&rpc, heads, args.argv, &preamble, &rpc_result);
1212         if (rpc_result.len)
1213                 write_or_die(1, rpc_result.buf, rpc_result.len);
1214         strbuf_release(&rpc_result);
1215         strbuf_release(&preamble);
1216         argv_array_clear(&args);
1217         return err;
1218 }
1219
1220 static int push(int nr_spec, char **specs)
1221 {
1222         struct discovery *heads = discover_refs("git-receive-pack", 1);
1223         int ret;
1224
1225         if (heads->proto_git)
1226                 ret = push_git(heads, nr_spec, specs);
1227         else
1228                 ret = push_dav(nr_spec, specs);
1229         free_discovery(heads);
1230         return ret;
1231 }
1232
1233 static void parse_push(struct strbuf *buf)
1234 {
1235         char **specs = NULL;
1236         int alloc_spec = 0, nr_spec = 0, i, ret;
1237
1238         do {
1239                 if (starts_with(buf->buf, "push ")) {
1240                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1241                         specs[nr_spec++] = xstrdup(buf->buf + 5);
1242                 }
1243                 else
1244                         die("http transport does not support %s", buf->buf);
1245
1246                 strbuf_reset(buf);
1247                 if (strbuf_getline_lf(buf, stdin) == EOF)
1248                         goto free_specs;
1249                 if (!*buf->buf)
1250                         break;
1251         } while (1);
1252
1253         ret = push(nr_spec, specs);
1254         printf("\n");
1255         fflush(stdout);
1256
1257         if (ret)
1258                 exit(128); /* error already reported */
1259
1260  free_specs:
1261         for (i = 0; i < nr_spec; i++)
1262                 free(specs[i]);
1263         free(specs);
1264 }
1265
1266 static int stateless_connect(const char *service_name)
1267 {
1268         struct discovery *discover;
1269         struct rpc_state rpc;
1270         struct strbuf buf = STRBUF_INIT;
1271
1272         /*
1273          * Run the info/refs request and see if the server supports protocol
1274          * v2.  If and only if the server supports v2 can we successfully
1275          * establish a stateless connection, otherwise we need to tell the
1276          * client to fallback to using other transport helper functions to
1277          * complete their request.
1278          */
1279         discover = discover_refs(service_name, 0);
1280         if (discover->version != protocol_v2) {
1281                 printf("fallback\n");
1282                 fflush(stdout);
1283                 return -1;
1284         } else {
1285                 /* Stateless Connection established */
1286                 printf("\n");
1287                 fflush(stdout);
1288         }
1289
1290         rpc.service_name = service_name;
1291         rpc.service_url = xstrfmt("%s%s", url.buf, rpc.service_name);
1292         rpc.hdr_content_type = xstrfmt("Content-Type: application/x-%s-request", rpc.service_name);
1293         rpc.hdr_accept = xstrfmt("Accept: application/x-%s-result", rpc.service_name);
1294         if (get_protocol_http_header(discover->version, &buf)) {
1295                 rpc.protocol_header = strbuf_detach(&buf, NULL);
1296         } else {
1297                 rpc.protocol_header = NULL;
1298                 strbuf_release(&buf);
1299         }
1300         rpc.buf = xmalloc(http_post_buffer);
1301         rpc.alloc = http_post_buffer;
1302         rpc.len = 0;
1303         rpc.pos = 0;
1304         rpc.in = 1;
1305         rpc.out = 0;
1306         rpc.any_written = 0;
1307         rpc.gzip_request = 1;
1308         rpc.initial_buffer = 0;
1309         rpc.write_line_lengths = 1;
1310         rpc.flush_read_but_not_sent = 0;
1311
1312         /*
1313          * Dump the capability listing that we got from the server earlier
1314          * during the info/refs request.
1315          */
1316         write_or_die(rpc.in, discover->buf, discover->len);
1317
1318         /* Until we see EOF keep sending POSTs */
1319         while (1) {
1320                 size_t avail;
1321                 enum packet_read_status status;
1322
1323                 if (!rpc_read_from_out(&rpc, PACKET_READ_GENTLE_ON_EOF, &avail,
1324                                        &status))
1325                         BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
1326                 if (status == PACKET_READ_EOF)
1327                         break;
1328                 if (post_rpc(&rpc, status == PACKET_READ_FLUSH))
1329                         /* We would have an err here */
1330                         break;
1331                 /* Reset the buffer for next request */
1332                 rpc.len = 0;
1333         }
1334
1335         free(rpc.service_url);
1336         free(rpc.hdr_content_type);
1337         free(rpc.hdr_accept);
1338         free(rpc.protocol_header);
1339         free(rpc.buf);
1340         strbuf_release(&buf);
1341
1342         return 0;
1343 }
1344
1345 int cmd_main(int argc, const char **argv)
1346 {
1347         struct strbuf buf = STRBUF_INIT;
1348         int nongit;
1349
1350         setup_git_directory_gently(&nongit);
1351         if (argc < 2) {
1352                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
1353                 return 1;
1354         }
1355
1356         options.verbosity = 1;
1357         options.progress = !!isatty(2);
1358         options.thin = 1;
1359         string_list_init(&options.deepen_not, 1);
1360         string_list_init(&options.push_options, 1);
1361
1362         /*
1363          * Just report "remote-curl" here (folding all the various aliases
1364          * ("git-remote-http", "git-remote-https", and etc.) here since they
1365          * are all just copies of the same actual executable.
1366          */
1367         trace2_cmd_name("remote-curl");
1368
1369         remote = remote_get(argv[1]);
1370
1371         if (argc > 2) {
1372                 end_url_with_slash(&url, argv[2]);
1373         } else {
1374                 end_url_with_slash(&url, remote->url[0]);
1375         }
1376
1377         http_init(remote, url.buf, 0);
1378
1379         do {
1380                 const char *arg;
1381
1382                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1383                         if (ferror(stdin))
1384                                 error("remote-curl: error reading command stream from git");
1385                         return 1;
1386                 }
1387                 if (buf.len == 0)
1388                         break;
1389                 if (starts_with(buf.buf, "fetch ")) {
1390                         if (nongit)
1391                                 die("remote-curl: fetch attempted without a local repo");
1392                         parse_fetch(&buf);
1393
1394                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1395                         int for_push = !!strstr(buf.buf + 4, "for-push");
1396                         output_refs(get_refs(for_push));
1397
1398                 } else if (starts_with(buf.buf, "push ")) {
1399                         parse_push(&buf);
1400
1401                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1402                         char *value = strchr(arg, ' ');
1403                         int result;
1404
1405                         if (value)
1406                                 *value++ = '\0';
1407                         else
1408                                 value = "true";
1409
1410                         result = set_option(arg, value);
1411                         if (!result)
1412                                 printf("ok\n");
1413                         else if (result < 0)
1414                                 printf("error invalid value\n");
1415                         else
1416                                 printf("unsupported\n");
1417                         fflush(stdout);
1418
1419                 } else if (!strcmp(buf.buf, "capabilities")) {
1420                         printf("stateless-connect\n");
1421                         printf("fetch\n");
1422                         printf("option\n");
1423                         printf("push\n");
1424                         printf("check-connectivity\n");
1425                         printf("\n");
1426                         fflush(stdout);
1427                 } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1428                         if (!stateless_connect(arg))
1429                                 break;
1430                 } else {
1431                         error("remote-curl: unknown command '%s' from git", buf.buf);
1432                         return 1;
1433                 }
1434                 strbuf_reset(&buf);
1435         } while (1);
1436
1437         http_cleanup();
1438
1439         return 0;
1440 }