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