http-backend.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "repository.h"
   4 #include "refs.h"
   5 #include "pkt-line.h"
   6 #include "object.h"
   7 #include "tag.h"
   8 #include "exec-cmd.h"
   9 #include "run-command.h"
  10 #include "string-list.h"
  11 #include "url.h"
  12 #include "argv-array.h"
  13 #include "packfile.h"
  14 #include "object-store.h"
  15 #include "protocol.h"
  16
  17 static const char content_type[] = "Content-Type";
  18 static const char content_length[] = "Content-Length";
  19 static const char last_modified[] = "Last-Modified";
  20 static int getanyfile = 1;
  21 static unsigned long max_request_buffer = 10 * 1024 * 1024;
  22
  23 static struct string_list *query_params;
  24
  25 struct rpc_service {
  26         const char *name;
  27         const char *config_name;
  28         unsigned buffer_input : 1;
  29         signed enabled : 2;
  30 };
  31
  32 static struct rpc_service rpc_service[] = {
  33         { "upload-pack", "uploadpack", 1, 1 },
  34         { "receive-pack", "receivepack", 0, -1 },
  35 };
  36
  37 static struct string_list *get_parameters(void)
  38 {
  39         if (!query_params) {
  40                 const char *query = getenv("QUERY_STRING");
  41
  42                 query_params = xcalloc(1, sizeof(*query_params));
  43                 while (query && *query) {
  44                         char *name = url_decode_parameter_name(&query);
  45                         char *value = url_decode_parameter_value(&query);
  46                         struct string_list_item *i;
  47
  48                         i = string_list_lookup(query_params, name);
  49                         if (!i)
  50                                 i = string_list_insert(query_params, name);
  51                         else
  52                                 free(i->util);
  53                         i->util = value;
  54                 }
  55         }
  56         return query_params;
  57 }
  58
  59 static const char *get_parameter(const char *name)
  60 {
  61         struct string_list_item *i;
  62         i = string_list_lookup(get_parameters(), name);
  63         return i ? i->util : NULL;
  64 }
  65
  66 __attribute__((format (printf, 2, 3)))
  67 static void format_write(int fd, const char *fmt, ...)
  68 {
  69         static char buffer[1024];
  70
  71         va_list args;
  72         unsigned n;
  73
  74         va_start(args, fmt);
  75         n = vsnprintf(buffer, sizeof(buffer), fmt, args);
  76         va_end(args);
  77         if (n >= sizeof(buffer))
  78                 die("protocol error: impossibly long line");
  79
  80         write_or_die(fd, buffer, n);
  81 }
  82
  83 static void http_status(struct strbuf *hdr, unsigned code, const char *msg)
  84 {
  85         strbuf_addf(hdr, "Status: %u %s\r\n", code, msg);
  86 }
  87
  88 static void hdr_str(struct strbuf *hdr, const char *name, const char *value)
  89 {
  90         strbuf_addf(hdr, "%s: %s\r\n", name, value);
  91 }
  92
  93 static void hdr_int(struct strbuf *hdr, const char *name, uintmax_t value)
  94 {
  95         strbuf_addf(hdr, "%s: %" PRIuMAX "\r\n", name, value);
  96 }
  97
  98 static void hdr_date(struct strbuf *hdr, const char *name, timestamp_t when)
  99 {
 100         const char *value = show_date(when, 0, DATE_MODE(RFC2822));
 101         hdr_str(hdr, name, value);
 102 }
 103
 104 static void hdr_nocache(struct strbuf *hdr)
 105 {
 106         hdr_str(hdr, "Expires", "Fri, 01 Jan 1980 00:00:00 GMT");
 107         hdr_str(hdr, "Pragma", "no-cache");
 108         hdr_str(hdr, "Cache-Control", "no-cache, max-age=0, must-revalidate");
 109 }
 110
 111 static void hdr_cache_forever(struct strbuf *hdr)
 112 {
 113         timestamp_t now = time(NULL);
 114         hdr_date(hdr, "Date", now);
 115         hdr_date(hdr, "Expires", now + 31536000);
 116         hdr_str(hdr, "Cache-Control", "public, max-age=31536000");
 117 }
 118
 119 static void end_headers(struct strbuf *hdr)
 120 {
 121         strbuf_add(hdr, "\r\n", 2);
 122         write_or_die(1, hdr->buf, hdr->len);
 123         strbuf_release(hdr);
 124 }
 125
 126 __attribute__((format (printf, 2, 3)))
 127 static NORETURN void not_found(struct strbuf *hdr, const char *err, ...)
 128 {
 129         va_list params;
 130
 131         http_status(hdr, 404, "Not Found");
 132         hdr_nocache(hdr);
 133         end_headers(hdr);
 134
 135         va_start(params, err);
 136         if (err && *err)
 137                 vfprintf(stderr, err, params);
 138         va_end(params);
 139         exit(0);
 140 }
 141
 142 __attribute__((format (printf, 2, 3)))
 143 static NORETURN void forbidden(struct strbuf *hdr, const char *err, ...)
 144 {
 145         va_list params;
 146
 147         http_status(hdr, 403, "Forbidden");
 148         hdr_nocache(hdr);
 149         end_headers(hdr);
 150
 151         va_start(params, err);
 152         if (err && *err)
 153                 vfprintf(stderr, err, params);
 154         va_end(params);
 155         exit(0);
 156 }
 157
 158 static void select_getanyfile(struct strbuf *hdr)
 159 {
 160         if (!getanyfile)
 161                 forbidden(hdr, "Unsupported service: getanyfile");
 162 }
 163
 164 static void send_strbuf(struct strbuf *hdr,
 165                         const char *type, struct strbuf *buf)
 166 {
 167         hdr_int(hdr, content_length, buf->len);
 168         hdr_str(hdr, content_type, type);
 169         end_headers(hdr);
 170         write_or_die(1, buf->buf, buf->len);
 171 }
 172
 173 static void send_local_file(struct strbuf *hdr, const char *the_type,
 174                                 const char *name)
 175 {
 176         char *p = git_pathdup("%s", name);
 177         size_t buf_alloc = 8192;
 178         char *buf = xmalloc(buf_alloc);
 179         int fd;
 180         struct stat sb;
 181
 182         fd = open(p, O_RDONLY);
 183         if (fd < 0)
 184                 not_found(hdr, "Cannot open '%s': %s", p, strerror(errno));
 185         if (fstat(fd, &sb) < 0)
 186                 die_errno("Cannot stat '%s'", p);
 187
 188         hdr_int(hdr, content_length, sb.st_size);
 189         hdr_str(hdr, content_type, the_type);
 190         hdr_date(hdr, last_modified, sb.st_mtime);
 191         end_headers(hdr);
 192
 193         for (;;) {
 194                 ssize_t n = xread(fd, buf, buf_alloc);
 195                 if (n < 0)
 196                         die_errno("Cannot read '%s'", p);
 197                 if (!n)
 198                         break;
 199                 write_or_die(1, buf, n);
 200         }
 201         close(fd);
 202         free(buf);
 203         free(p);
 204 }
 205
 206 static void get_text_file(struct strbuf *hdr, char *name)
 207 {
 208         select_getanyfile(hdr);
 209         hdr_nocache(hdr);
 210         send_local_file(hdr, "text/plain", name);
 211 }
 212
 213 static void get_loose_object(struct strbuf *hdr, char *name)
 214 {
 215         select_getanyfile(hdr);
 216         hdr_cache_forever(hdr);
 217         send_local_file(hdr, "application/x-git-loose-object", name);
 218 }
 219
 220 static void get_pack_file(struct strbuf *hdr, char *name)
 221 {
 222         select_getanyfile(hdr);
 223         hdr_cache_forever(hdr);
 224         send_local_file(hdr, "application/x-git-packed-objects", name);
 225 }
 226
 227 static void get_idx_file(struct strbuf *hdr, char *name)
 228 {
 229         select_getanyfile(hdr);
 230         hdr_cache_forever(hdr);
 231         send_local_file(hdr, "application/x-git-packed-objects-toc", name);
 232 }
 233
 234 static void http_config(void)
 235 {
 236         int i, value = 0;
 237         struct strbuf var = STRBUF_INIT;
 238
 239         git_config_get_bool("http.getanyfile", &getanyfile);
 240         git_config_get_ulong("http.maxrequestbuffer", &max_request_buffer);
 241
 242         for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
 243                 struct rpc_service *svc = &rpc_service[i];
 244                 strbuf_addf(&var, "http.%s", svc->config_name);
 245                 if (!git_config_get_bool(var.buf, &value))
 246                         svc->enabled = value;
 247                 strbuf_reset(&var);
 248         }
 249
 250         strbuf_release(&var);
 251 }
 252
 253 static struct rpc_service *select_service(struct strbuf *hdr, const char *name)
 254 {
 255         const char *svc_name;
 256         struct rpc_service *svc = NULL;
 257         int i;
 258
 259         if (!skip_prefix(name, "git-", &svc_name))
 260                 forbidden(hdr, "Unsupported service: '%s'", name);
 261
 262         for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
 263                 struct rpc_service *s = &rpc_service[i];
 264                 if (!strcmp(s->name, svc_name)) {
 265                         svc = s;
 266                         break;
 267                 }
 268         }
 269
 270         if (!svc)
 271                 forbidden(hdr, "Unsupported service: '%s'", name);
 272
 273         if (svc->enabled < 0) {
 274                 const char *user = getenv("REMOTE_USER");
 275                 svc->enabled = (user && *user) ? 1 : 0;
 276         }
 277         if (!svc->enabled)
 278                 forbidden(hdr, "Service not enabled: '%s'", svc->name);
 279         return svc;
 280 }
 281
 282 /*
 283  * This is basically strbuf_read(), except that if we
 284  * hit max_request_buffer we die (we'd rather reject a
 285  * maliciously large request than chew up infinite memory).
 286  */
 287 static ssize_t read_request(int fd, unsigned char **out)
 288 {
 289         size_t len = 0, alloc = 8192;
 290         unsigned char *buf = xmalloc(alloc);
 291
 292         if (max_request_buffer < alloc)
 293                 max_request_buffer = alloc;
 294
 295         while (1) {
 296                 ssize_t cnt;
 297
 298                 cnt = read_in_full(fd, buf + len, alloc - len);
 299                 if (cnt < 0) {
 300                         free(buf);
 301                         return -1;
 302                 }
 303
 304                 /* partial read from read_in_full means we hit EOF */
 305                 len += cnt;
 306                 if (len < alloc) {
 307                         *out = buf;
 308                         return len;
 309                 }
 310
 311                 /* otherwise, grow and try again (if we can) */
 312                 if (alloc == max_request_buffer)
 313                         die("request was larger than our maximum size (%lu);"
 314                             " try setting GIT_HTTP_MAX_REQUEST_BUFFER",
 315                             max_request_buffer);
 316
 317                 alloc = alloc_nr(alloc);
 318                 if (alloc > max_request_buffer)
 319                         alloc = max_request_buffer;
 320                 REALLOC_ARRAY(buf, alloc);
 321         }
 322 }
 323
 324 static void inflate_request(const char *prog_name, int out, int buffer_input)
 325 {
 326         git_zstream stream;
 327         unsigned char *full_request = NULL;
 328         unsigned char in_buf[8192];
 329         unsigned char out_buf[8192];
 330         unsigned long cnt = 0;
 331
 332         memset(&stream, 0, sizeof(stream));
 333         git_inflate_init_gzip_only(&stream);
 334
 335         while (1) {
 336                 ssize_t n;
 337
 338                 if (buffer_input) {
 339                         if (full_request)
 340                                 n = 0; /* nothing left to read */
 341                         else
 342                                 n = read_request(0, &full_request);
 343                         stream.next_in = full_request;
 344                 } else {
 345                         n = xread(0, in_buf, sizeof(in_buf));
 346                         stream.next_in = in_buf;
 347                 }
 348
 349                 if (n <= 0)
 350                         die("request ended in the middle of the gzip stream");
 351                 stream.avail_in = n;
 352
 353                 while (0 < stream.avail_in) {
 354                         int ret;
 355
 356                         stream.next_out = out_buf;
 357                         stream.avail_out = sizeof(out_buf);
 358
 359                         ret = git_inflate(&stream, Z_NO_FLUSH);
 360                         if (ret != Z_OK && ret != Z_STREAM_END)
 361                                 die("zlib error inflating request, result %d", ret);
 362
 363                         n = stream.total_out - cnt;
 364                         if (write_in_full(out, out_buf, n) < 0)
 365                                 die("%s aborted reading request", prog_name);
 366                         cnt += n;
 367
 368                         if (ret == Z_STREAM_END)
 369                                 goto done;
 370                 }
 371         }
 372
 373 done:
 374         git_inflate_end(&stream);
 375         close(out);
 376         free(full_request);
 377 }
 378
 379 static void copy_request(const char *prog_name, int out)
 380 {
 381         unsigned char *buf;
 382         ssize_t n = read_request(0, &buf);
 383         if (n < 0)
 384                 die_errno("error reading request body");
 385         if (write_in_full(out, buf, n) < 0)
 386                 die("%s aborted reading request", prog_name);
 387         close(out);
 388         free(buf);
 389 }
 390
 391 static void run_service(const char **argv, int buffer_input)
 392 {
 393         const char *encoding = getenv("HTTP_CONTENT_ENCODING");
 394         const char *user = getenv("REMOTE_USER");
 395         const char *host = getenv("REMOTE_ADDR");
 396         int gzipped_request = 0;
 397         struct child_process cld = CHILD_PROCESS_INIT;
 398
 399         if (encoding && !strcmp(encoding, "gzip"))
 400                 gzipped_request = 1;
 401         else if (encoding && !strcmp(encoding, "x-gzip"))
 402                 gzipped_request = 1;
 403
 404         if (!user || !*user)
 405                 user = "anonymous";
 406         if (!host || !*host)
 407                 host = "(none)";
 408
 409         if (!getenv("GIT_COMMITTER_NAME"))
 410                 argv_array_pushf(&cld.env_array, "GIT_COMMITTER_NAME=%s", user);
 411         if (!getenv("GIT_COMMITTER_EMAIL"))
 412                 argv_array_pushf(&cld.env_array,
 413                                  "GIT_COMMITTER_EMAIL=%s@http.%s", user, host);
 414
 415         cld.argv = argv;
 416         if (buffer_input || gzipped_request)
 417                 cld.in = -1;
 418         cld.git_cmd = 1;
 419         if (start_command(&cld))
 420                 exit(1);
 421
 422         close(1);
 423         if (gzipped_request)
 424                 inflate_request(argv[0], cld.in, buffer_input);
 425         else if (buffer_input)
 426                 copy_request(argv[0], cld.in);
 427         else
 428                 close(0);
 429
 430         if (finish_command(&cld))
 431                 exit(1);
 432 }
 433
 434 static int show_text_ref(const char *name, const struct object_id *oid,
 435                          int flag, void *cb_data)
 436 {
 437         const char *name_nons = strip_namespace(name);
 438         struct strbuf *buf = cb_data;
 439         struct object *o = parse_object(oid);
 440         if (!o)
 441                 return 0;
 442
 443         strbuf_addf(buf, "%s\t%s\n", oid_to_hex(oid), name_nons);
 444         if (o->type == OBJ_TAG) {
 445                 o = deref_tag(o, name, 0);
 446                 if (!o)
 447                         return 0;
 448                 strbuf_addf(buf, "%s\t%s^{}\n", oid_to_hex(&o->oid),
 449                             name_nons);
 450         }
 451         return 0;
 452 }
 453
 454 static void get_info_refs(struct strbuf *hdr, char *arg)
 455 {
 456         const char *service_name = get_parameter("service");
 457         struct strbuf buf = STRBUF_INIT;
 458
 459         hdr_nocache(hdr);
 460
 461         if (service_name) {
 462                 const char *argv[] = {NULL /* service name */,
 463                         "--stateless-rpc", "--advertise-refs",
 464                         ".", NULL};
 465                 struct rpc_service *svc = select_service(hdr, service_name);
 466
 467                 strbuf_addf(&buf, "application/x-git-%s-advertisement",
 468                         svc->name);
 469                 hdr_str(hdr, content_type, buf.buf);
 470                 end_headers(hdr);
 471
 472
 473                 if (determine_protocol_version_server() != protocol_v2) {
 474                         packet_write_fmt(1, "# service=git-%s\n", svc->name);
 475                         packet_flush(1);
 476                 }
 477
 478                 argv[0] = svc->name;
 479                 run_service(argv, 0);
 480
 481         } else {
 482                 select_getanyfile(hdr);
 483                 for_each_namespaced_ref(show_text_ref, &buf);
 484                 send_strbuf(hdr, "text/plain", &buf);
 485         }
 486         strbuf_release(&buf);
 487 }
 488
 489 static int show_head_ref(const char *refname, const struct object_id *oid,
 490                          int flag, void *cb_data)
 491 {
 492         struct strbuf *buf = cb_data;
 493
 494         if (flag & REF_ISSYMREF) {
 495                 const char *target = resolve_ref_unsafe(refname,
 496                                                         RESOLVE_REF_READING,
 497                                                         NULL, NULL);
 498
 499                 if (target)
 500                         strbuf_addf(buf, "ref: %s\n", strip_namespace(target));
 501         } else {
 502                 strbuf_addf(buf, "%s\n", oid_to_hex(oid));
 503         }
 504
 505         return 0;
 506 }
 507
 508 static void get_head(struct strbuf *hdr, char *arg)
 509 {
 510         struct strbuf buf = STRBUF_INIT;
 511
 512         select_getanyfile(hdr);
 513         head_ref_namespaced(show_head_ref, &buf);
 514         send_strbuf(hdr, "text/plain", &buf);
 515         strbuf_release(&buf);
 516 }
 517
 518 static void get_info_packs(struct strbuf *hdr, char *arg)
 519 {
 520         size_t objdirlen = strlen(get_object_directory());
 521         struct strbuf buf = STRBUF_INIT;
 522         struct packed_git *p;
 523         size_t cnt = 0;
 524
 525         select_getanyfile(hdr);
 526         for (p = get_packed_git(the_repository); p; p = p->next) {
 527                 if (p->pack_local)
 528                         cnt++;
 529         }
 530
 531         strbuf_grow(&buf, cnt * 53 + 2);
 532         for (p = get_packed_git(the_repository); p; p = p->next) {
 533                 if (p->pack_local)
 534                         strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6);
 535         }
 536         strbuf_addch(&buf, '\n');
 537
 538         hdr_nocache(hdr);
 539         send_strbuf(hdr, "text/plain; charset=utf-8", &buf);
 540         strbuf_release(&buf);
 541 }
 542
 543 static void check_content_type(struct strbuf *hdr, const char *accepted_type)
 544 {
 545         const char *actual_type = getenv("CONTENT_TYPE");
 546
 547         if (!actual_type)
 548                 actual_type = "";
 549
 550         if (strcmp(actual_type, accepted_type)) {
 551                 http_status(hdr, 415, "Unsupported Media Type");
 552                 hdr_nocache(hdr);
 553                 end_headers(hdr);
 554                 format_write(1,
 555                         "Expected POST with Content-Type '%s',"
 556                         " but received '%s' instead.\n",
 557                         accepted_type, actual_type);
 558                 exit(0);
 559         }
 560 }
 561
 562 static void service_rpc(struct strbuf *hdr, char *service_name)
 563 {
 564         const char *argv[] = {NULL, "--stateless-rpc", ".", NULL};
 565         struct rpc_service *svc = select_service(hdr, service_name);
 566         struct strbuf buf = STRBUF_INIT;
 567
 568         strbuf_reset(&buf);
 569         strbuf_addf(&buf, "application/x-git-%s-request", svc->name);
 570         check_content_type(hdr, buf.buf);
 571
 572         hdr_nocache(hdr);
 573
 574         strbuf_reset(&buf);
 575         strbuf_addf(&buf, "application/x-git-%s-result", svc->name);
 576         hdr_str(hdr, content_type, buf.buf);
 577
 578         end_headers(hdr);
 579
 580         argv[0] = svc->name;
 581         run_service(argv, svc->buffer_input);
 582         strbuf_release(&buf);
 583 }
 584
 585 static int dead;
 586 static NORETURN void die_webcgi(const char *err, va_list params)
 587 {
 588         if (dead <= 1) {
 589                 struct strbuf hdr = STRBUF_INIT;
 590
 591                 vreportf("fatal: ", err, params);
 592
 593                 http_status(&hdr, 500, "Internal Server Error");
 594                 hdr_nocache(&hdr);
 595                 end_headers(&hdr);
 596         }
 597         exit(0); /* we successfully reported a failure ;-) */
 598 }
 599
 600 static int die_webcgi_recursing(void)
 601 {
 602         return dead++ > 1;
 603 }
 604
 605 static char* getdir(void)
 606 {
 607         struct strbuf buf = STRBUF_INIT;
 608         char *pathinfo = getenv("PATH_INFO");
 609         char *root = getenv("GIT_PROJECT_ROOT");
 610         char *path = getenv("PATH_TRANSLATED");
 611
 612         if (root && *root) {
 613                 if (!pathinfo || !*pathinfo)
 614                         die("GIT_PROJECT_ROOT is set but PATH_INFO is not");
 615                 if (daemon_avoid_alias(pathinfo))
 616                         die("'%s': aliased", pathinfo);
 617                 end_url_with_slash(&buf, root);
 618                 if (pathinfo[0] == '/')
 619                         pathinfo++;
 620                 strbuf_addstr(&buf, pathinfo);
 621                 return strbuf_detach(&buf, NULL);
 622         } else if (path && *path) {
 623                 return xstrdup(path);
 624         } else
 625                 die("No GIT_PROJECT_ROOT or PATH_TRANSLATED from server");
 626         return NULL;
 627 }
 628
 629 static struct service_cmd {
 630         const char *method;
 631         const char *pattern;
 632         void (*imp)(struct strbuf *, char *);
 633 } services[] = {
 634         {"GET", "/HEAD$", get_head},
 635         {"GET", "/info/refs$", get_info_refs},
 636         {"GET", "/objects/info/alternates$", get_text_file},
 637         {"GET", "/objects/info/http-alternates$", get_text_file},
 638         {"GET", "/objects/info/packs$", get_info_packs},
 639         {"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{38}$", get_loose_object},
 640         {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.pack$", get_pack_file},
 641         {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.idx$", get_idx_file},
 642
 643         {"POST", "/git-upload-pack$", service_rpc},
 644         {"POST", "/git-receive-pack$", service_rpc}
 645 };
 646
 647 static int bad_request(struct strbuf *hdr, const struct service_cmd *c)
 648 {
 649         const char *proto = getenv("SERVER_PROTOCOL");
 650
 651         if (proto && !strcmp(proto, "HTTP/1.1")) {
 652                 http_status(hdr, 405, "Method Not Allowed");
 653                 hdr_str(hdr, "Allow",
 654                         !strcmp(c->method, "GET") ? "GET, HEAD" : c->method);
 655         } else
 656                 http_status(hdr, 400, "Bad Request");
 657         hdr_nocache(hdr);
 658         end_headers(hdr);
 659         return 0;
 660 }
 661
 662 int cmd_main(int argc, const char **argv)
 663 {
 664         char *method = getenv("REQUEST_METHOD");
 665         char *dir;
 666         struct service_cmd *cmd = NULL;
 667         char *cmd_arg = NULL;
 668         int i;
 669         struct strbuf hdr = STRBUF_INIT;
 670
 671         set_die_routine(die_webcgi);
 672         set_die_is_recursing_routine(die_webcgi_recursing);
 673
 674         if (!method)
 675                 die("No REQUEST_METHOD from server");
 676         if (!strcmp(method, "HEAD"))
 677                 method = "GET";
 678         dir = getdir();
 679
 680         for (i = 0; i < ARRAY_SIZE(services); i++) {
 681                 struct service_cmd *c = &services[i];
 682                 regex_t re;
 683                 regmatch_t out[1];
 684
 685                 if (regcomp(&re, c->pattern, REG_EXTENDED))
 686                         die("Bogus regex in service table: %s", c->pattern);
 687                 if (!regexec(&re, dir, 1, out, 0)) {
 688                         size_t n;
 689
 690                         if (strcmp(method, c->method))
 691                                 return bad_request(&hdr, c);
 692
 693                         cmd = c;
 694                         n = out[0].rm_eo - out[0].rm_so;
 695                         cmd_arg = xmemdupz(dir + out[0].rm_so + 1, n - 1);
 696                         dir[out[0].rm_so] = 0;
 697                         break;
 698                 }
 699                 regfree(&re);
 700         }
 701
 702         if (!cmd)
 703                 not_found(&hdr, "Request not supported: '%s'", dir);
 704
 705         setup_path();
 706         if (!enter_repo(dir, 0))
 707                 not_found(&hdr, "Not a git repository: '%s'", dir);
 708         if (!getenv("GIT_HTTP_EXPORT_ALL") &&
 709             access("git-daemon-export-ok", F_OK) )
 710                 not_found(&hdr, "Repository not exported: '%s'", dir);
 711
 712         http_config();
 713         max_request_buffer = git_env_ulong("GIT_HTTP_MAX_REQUEST_BUFFER",
 714                                            max_request_buffer);
 715
 716         cmd->imp(&hdr, cmd_arg);
 717         return 0;
 718 }