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