git.oblomov.eu Git - git/blob - 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
  16 static const char content_type[] = "Content-Type";
  17 static const char content_length[] = "Content-Length";
  18 static const char last_modified[] = "Last-Modified";
  19 static int getanyfile = 1;
  20 static unsigned long max_request_buffer = 10 * 1024 * 1024;
  21
  22 static struct string_list *query_params;
  23
  24 struct rpc_service {
  25         const char *name;
  26         const char *config_name;
  27         unsigned buffer_input : 1;
  28         signed enabled : 2;
  29 };
  30
  31 static struct rpc_service rpc_service[] = {
  32         { "upload-pack", "uploadpack", 1, 1 },
  33         { "receive-pack", "receivepack", 0, -1 },
  34 };
  35
  36 static struct string_list *get_parameters(void)
  37 {
  38         if (!query_params) {
  39                 const char *query = getenv("QUERY_STRING");
  40
  41                 query_params = xcalloc(1, sizeof(*query_params));
  42                 while (query && *query) {
  43                         char *name = url_decode_parameter_name(&query);
  44                         char *value = url_decode_parameter_value(&query);
  45                         struct string_list_item *i;
  46
  47                         i = string_list_lookup(query_params, name);
  48                         if (!i)
  49                                 i = string_list_insert(query_params, name);
  50                         else
  51                                 free(i->util);
  52                         i->util = value;
  53                 }
  54         }
  55         return query_params;
  56 }
  57
  58 static const char *get_parameter(const char *name)
  59 {
  60         struct string_list_item *i;
  61         i = string_list_lookup(get_parameters(), name);
  62         return i ? i->util : NULL;
  63 }
  64
  65 __attribute__((format (printf, 2, 3)))
  66 static void format_write(int fd, const char *fmt, ...)
  67 {
  68         static char buffer[1024];
  69
  70         va_list args;
  71         unsigned n;
  72
  73         va_start(args, fmt);
  74         n = vsnprintf(buffer, sizeof(buffer), fmt, args);
  75         va_end(args);
  76         if (n >= sizeof(buffer))
  77                 die("protocol error: impossibly long line");
  78
  79         write_or_die(fd, buffer, n);
  80 }
  81
  82 static void http_status(struct strbuf *hdr, unsigned code, const char *msg)
  83 {
  84         strbuf_addf(hdr, "Status: %u %s\r\n", code, msg);
  85 }
  86
  87 static void hdr_str(struct strbuf *hdr, const char *name, const char *value)
  88 {
  89         strbuf_addf(hdr, "%s: %s\r\n", name, value);
  90 }
  91
  92 static void hdr_int(struct strbuf *hdr, const char *name, uintmax_t value)
  93 {
  94         strbuf_addf(hdr, "%s: %" PRIuMAX "\r\n", name, value);
  95 }
  96
  97 static void hdr_date(struct strbuf *hdr, const char *name, timestamp_t when)
  98 {
  99         const char *value = show_date(when, 0, DATE_MODE(RFC2822));
 100         hdr_str(hdr, name, value);
 101 }
 102
 103 static void hdr_nocache(struct strbuf *hdr)
 104 {
 105         hdr_str(hdr, "Expires", "Fri, 01 Jan 1980 00:00:00 GMT");
 106         hdr_str(hdr, "Pragma", "no-cache");
 107         hdr_str(hdr, "Cache-Control", "no-cache, max-age=0, must-revalidate");
 108 }
 109
 110 static void hdr_cache_forever(struct strbuf *hdr)
 111 {
 112         timestamp_t now = time(NULL);
 113         hdr_date(hdr, "Date", now);
 114         hdr_date(hdr, "Expires", now + 31536000);
 115         hdr_str(hdr, "Cache-Control", "public, max-age=31536000");
 116 }
 117
 118 static void end_headers(struct strbuf *hdr)
 119 {
 120         strbuf_add(hdr, "\r\n", 2);
 121         write_or_die(1, hdr->buf, hdr->len);
 122         strbuf_release(hdr);
 123 }
 124
 125 __attribute__((format (printf, 2, 3)))
 126 static NORETURN void not_found(struct strbuf *hdr, const char *err, ...)
 127 {
 128         va_list params;
 129
 130         http_status(hdr, 404, "Not Found");
 131         hdr_nocache(hdr);
 132         end_headers(hdr);
 133
 134         va_start(params, err);
 135         if (err && *err)
 136                 vfprintf(stderr, err, params);
 137         va_end(params);
 138         exit(0);
 139 }
 140
 141 __attribute__((format (printf, 2, 3)))
 142 static NORETURN void forbidden(struct strbuf *hdr, const char *err, ...)
 143 {
 144         va_list params;
 145
 146         http_status(hdr, 403, "Forbidden");
 147         hdr_nocache(hdr);
 148         end_headers(hdr);
 149
 150         va_start(params, err);
 151         if (err && *err)
 152                 vfprintf(stderr, err, params);
 153         va_end(params);
 154         exit(0);
 155 }
 156
 157 static void select_getanyfile(struct strbuf *hdr)
 158 {
 159         if (!getanyfile)
 160                 forbidden(hdr, "Unsupported service: getanyfile");
 161 }
 162
 163 static void send_strbuf(struct strbuf *hdr,
 164                         const char *type, struct strbuf *buf)
 165 {
 166         hdr_int(hdr, content_length, buf->len);
 167         hdr_str(hdr, content_type, type);
 168         end_headers(hdr);
 169         write_or_die(1, buf->buf, buf->len);
 170 }
 171
 172 static void send_local_file(struct strbuf *hdr, const char *the_type,
 173                                 const char *name)
 174 {
 175         char *p = git_pathdup("%s", name);
 176         size_t buf_alloc = 8192;
 177         char *buf = xmalloc(buf_alloc);
 178         int fd;
 179         struct stat sb;
 180
 181         fd = open(p, O_RDONLY);
 182         if (fd < 0)
 183                 not_found(hdr, "Cannot open '%s': %s", p, strerror(errno));
 184         if (fstat(fd, &sb) < 0)
 185                 die_errno("Cannot stat '%s'", p);
 186
 187         hdr_int(hdr, content_length, sb.st_size);
 188         hdr_str(hdr, content_type, the_type);
 189         hdr_date(hdr, last_modified, sb.st_mtime);
 190         end_headers(hdr);
 191
 192         for (;;) {
 193                 ssize_t n = xread(fd, buf, buf_alloc);
 194                 if (n < 0)
 195                         die_errno("Cannot read '%s'", p);
 196                 if (!n)
 197                         break;
 198                 write_or_die(1, buf, n);
 199         }
 200         close(fd);
 201         free(buf);
 202         free(p);
 203 }
 204
 205 static void get_text_file(struct strbuf *hdr, char *name)
 206 {
 207         select_getanyfile(hdr);
 208         hdr_nocache(hdr);
 209         send_local_file(hdr, "text/plain", name);
 210 }
 211
 212 static void get_loose_object(struct strbuf *hdr, char *name)
 213 {
 214         select_getanyfile(hdr);
 215         hdr_cache_forever(hdr);
 216         send_local_file(hdr, "application/x-git-loose-object", name);
 217 }
 218
 219 static void get_pack_file(struct strbuf *hdr, char *name)
 220 {
 221         select_getanyfile(hdr);
 222         hdr_cache_forever(hdr);
 223         send_local_file(hdr, "application/x-git-packed-objects", name);
 224 }
 225
 226 static void get_idx_file(struct strbuf *hdr, char *name)
 227 {
 228         select_getanyfile(hdr);
 229         hdr_cache_forever(hdr);
 230         send_local_file(hdr, "application/x-git-packed-objects-toc", name);
 231 }
 232
 233 static void http_config(void)
 234 {
 235         int i, value = 0;
 236         struct strbuf var = STRBUF_INIT;
 237
 238         git_config_get_bool("http.getanyfile", &getanyfile);
 239         git_config_get_ulong("http.maxrequestbuffer", &max_request_buffer);
 240
 241         for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
 242                 struct rpc_service *svc = &rpc_service[i];
 243                 strbuf_addf(&var, "http.%s", svc->config_name);
 244                 if (!git_config_get_bool(var.buf, &value))
 245                         svc->enabled = value;
 246                 strbuf_reset(&var);
 247         }
 248
 249         strbuf_release(&var);
 250 }
 251
 252 static struct rpc_service *select_service(struct strbuf *hdr, const char *name)
 253 {
 254         const char *svc_name;
 255         struct rpc_service *svc = NULL;
 256         int i;
 257
 258         if (!skip_prefix(name, "git-", &svc_name))
 259                 forbidden(hdr, "Unsupported service: '%s'", name);
 260
 261         for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
 262                 struct rpc_service *s = &rpc_service[i];
 263                 if (!strcmp(s->name, svc_name)) {
 264                         svc = s;
 265                         break;
 266                 }
 267         }
 268
 269         if (!svc)
 270                 forbidden(hdr, "Unsupported service: '%s'", name);
 271
 272         if (svc->enabled < 0) {
 273                 const char *user = getenv("REMOTE_USER");
 274                 svc->enabled = (user && *user) ? 1 : 0;
 275         }
 276         if (!svc->enabled)
 277                 forbidden(hdr, "Service not enabled: '%s'", svc->name);
 278         return svc;
 279 }
 280
 281 /*
 282  * This is basically strbuf_read(), except that if we
 283  * hit max_request_buffer we die (we'd rather reject a
 284  * maliciously large request than chew up infinite memory).
 285  */
 286 static ssize_t read_request(int fd, unsigned char **out)
 287 {
 288         size_t len = 0, alloc = 8192;
 289         unsigned char *buf = xmalloc(alloc);
 290
 291         if (max_request_buffer < alloc)
 292                 max_request_buffer = alloc;
 293
 294         while (1) {
 295                 ssize_t cnt;
 296
 297                 cnt = read_in_full(fd, buf + len, alloc - len);
 298                 if (cnt < 0) {
 299                         free(buf);
 300                         return -1;
 301                 }
 302
 303                 /* partial read from read_in_full means we hit EOF */
 304                 len += cnt;
 305                 if (len < alloc) {
 306                         *out = buf;
 307                         return len;
 308                 }
 309
 310                 /* otherwise, grow and try again (if we can) */
 311                 if (alloc == max_request_buffer)
 312                         die("request was larger than our maximum size (%lu);"
 313                             " try setting GIT_HTTP_MAX_REQUEST_BUFFER",
 314                             max_request_buffer);
 315
 316                 alloc = alloc_nr(alloc);
 317                 if (alloc > max_request_buffer)
 318                         alloc = max_request_buffer;
 319                 REALLOC_ARRAY(buf, alloc);
 320         }
 321 }
 322
 323 static void inflate_request(const char *prog_name, int out, int buffer_input)
 324 {
 325         git_zstream stream;
 326         unsigned char *full_request = NULL;
 327         unsigned char in_buf[8192];
 328         unsigned char out_buf[8192];
 329         unsigned long cnt = 0;
 330
 331         memset(&stream, 0, sizeof(stream));
 332         git_inflate_init_gzip_only(&stream);
 333
 334         while (1) {
 335                 ssize_t n;
 336
 337                 if (buffer_input) {
 338                         if (full_request)
 339                                 n = 0; /* nothing left to read */
 340                         else
 341                                 n = read_request(0, &full_request);
 342                         stream.next_in = full_request;
 343                 } else {
 344                         n = xread(0, in_buf, sizeof(in_buf));
 345                         stream.next_in = in_buf;
 346                 }
 347
 348                 if (n <= 0)
 349                         die("request ended in the middle of the gzip stream");
 350                 stream.avail_in = n;
 351
 352                 while (0 < stream.avail_in) {
 353                         int ret;
 354
 355                         stream.next_out = out_buf;
 356                         stream.avail_out = sizeof(out_buf);
 357
 358                         ret = git_inflate(&stream, Z_NO_FLUSH);
 359                         if (ret != Z_OK && ret != Z_STREAM_END)
 360                                 die("zlib error inflating request, result %d", ret);
 361
 362                         n = stream.total_out - cnt;
 363                         if (write_in_full(out, out_buf, n) < 0)
 364                                 die("%s aborted reading request", prog_name);
 365                         cnt += n;
 366
 367                         if (ret == Z_STREAM_END)
 368                                 goto done;
 369                 }
 370         }
 371
 372 done:
 373         git_inflate_end(&stream);
 374         close(out);
 375         free(full_request);
 376 }
 377
 378 static void copy_request(const char *prog_name, int out)
 379 {
 380         unsigned char *buf;
 381         ssize_t n = read_request(0, &buf);
 382         if (n < 0)
 383                 die_errno("error reading request body");
 384         if (write_in_full(out, buf, n) < 0)
 385                 die("%s aborted reading request", prog_name);
 386         close(out);
 387         free(buf);
 388 }
 389
 390 static void run_service(const char **argv, int buffer_input)
 391 {
 392         const char *encoding = getenv("HTTP_CONTENT_ENCODING");
 393         const char *user = getenv("REMOTE_USER");
 394         const char *host = getenv("REMOTE_ADDR");
 395         int gzipped_request = 0;
 396         struct child_process cld = CHILD_PROCESS_INIT;
 397
 398         if (encoding && !strcmp(encoding, "gzip"))
 399                 gzipped_request = 1;
 400         else if (encoding && !strcmp(encoding, "x-gzip"))
 401                 gzipped_request = 1;
 402
 403         if (!user || !*user)
 404                 user = "anonymous";
 405         if (!host || !*host)
 406                 host = "(none)";
 407
 408         if (!getenv("GIT_COMMITTER_NAME"))
 409                 argv_array_pushf(&cld.env_array, "GIT_COMMITTER_NAME=%s", user);
 410         if (!getenv("GIT_COMMITTER_EMAIL"))
 411                 argv_array_pushf(&cld.env_array,
 412                                  "GIT_COMMITTER_EMAIL=%s@http.%s", user, host);
 413
 414         cld.argv = argv;
 415         if (buffer_input || gzipped_request)
 416                 cld.in = -1;
 417         cld.git_cmd = 1;
 418         if (start_command(&cld))
 419                 exit(1);
 420
 421         close(1);
 422         if (gzipped_request)
 423                 inflate_request(argv[0], cld.in, buffer_input);
 424         else if (buffer_input)
 425                 copy_request(argv[0], cld.in);
 426         else
 427                 close(0);
 428
 429         if (finish_command(&cld))
 430                 exit(1);
 431 }
 432
 433 static int show_text_ref(const char *name, const struct object_id *oid,
 434                          int flag, void *cb_data)
 435 {
 436         const char *name_nons = strip_namespace(name);
 437         struct strbuf *buf = cb_data;
 438         struct object *o = parse_object(oid);
 439         if (!o)
 440                 return 0;
 441
 442         strbuf_addf(buf, "%s\t%s\n", oid_to_hex(oid), name_nons);
 443         if (o->type == OBJ_TAG) {
 444                 o = deref_tag(o, name, 0);
 445                 if (!o)
 446                         return 0;
 447                 strbuf_addf(buf, "%s\t%s^{}\n", oid_to_hex(&o->oid),
 448                             name_nons);
 449         }
 450         return 0;
 451 }
 452
 453 static void get_info_refs(struct strbuf *hdr, char *arg)
 454 {
 455         const char *service_name = get_parameter("service");
 456         struct strbuf buf = STRBUF_INIT;
 457
 458         hdr_nocache(hdr);
 459
 460         if (service_name) {
 461                 const char *argv[] = {NULL /* service name */,
 462                         "--stateless-rpc", "--advertise-refs",
 463                         ".", NULL};
 464                 struct rpc_service *svc = select_service(hdr, service_name);
 465
 466                 strbuf_addf(&buf, "application/x-git-%s-advertisement",
 467                         svc->name);
 468                 hdr_str(hdr, content_type, buf.buf);
 469                 end_headers(hdr);
 470
 471                 packet_write_fmt(1, "# service=git-%s\n", svc->name);
 472                 packet_flush(1);
 473
 474                 argv[0] = svc->name;
 475                 run_service(argv, 0);
 476
 477         } else {
 478                 select_getanyfile(hdr);
 479                 for_each_namespaced_ref(show_text_ref, &buf);
 480                 send_strbuf(hdr, "text/plain", &buf);
 481         }
 482         strbuf_release(&buf);
 483 }
 484
 485 static int show_head_ref(const char *refname, const struct object_id *oid,
 486                          int flag, void *cb_data)
 487 {
 488         struct strbuf *buf = cb_data;
 489
 490         if (flag & REF_ISSYMREF) {
 491                 const char *target = resolve_ref_unsafe(refname,
 492                                                         RESOLVE_REF_READING,
 493                                                         NULL, NULL);
 494
 495                 if (target)
 496                         strbuf_addf(buf, "ref: %s\n", strip_namespace(target));
 497         } else {
 498                 strbuf_addf(buf, "%s\n", oid_to_hex(oid));
 499         }
 500
 501         return 0;
 502 }
 503
 504 static void get_head(struct strbuf *hdr, char *arg)
 505 {
 506         struct strbuf buf = STRBUF_INIT;
 507
 508         select_getanyfile(hdr);
 509         head_ref_namespaced(show_head_ref, &buf);
 510         send_strbuf(hdr, "text/plain", &buf);
 511         strbuf_release(&buf);
 512 }
 513
 514 static void get_info_packs(struct strbuf *hdr, char *arg)
 515 {
 516         size_t objdirlen = strlen(get_object_directory());
 517         struct strbuf buf = STRBUF_INIT;
 518         struct packed_git *p;
 519         size_t cnt = 0;
 520
 521         select_getanyfile(hdr);
 522         for (p = get_packed_git(the_repository); p; p = p->next) {
 523                 if (p->pack_local)
 524                         cnt++;
 525         }
 526
 527         strbuf_grow(&buf, cnt * 53 + 2);
 528         for (p = get_packed_git(the_repository); 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 }