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