git.oblomov.eu Git - git/blob - http-backend.c

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