Line data    Source code

       1             : /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
       2             : 
       3             : /***
       4             :   This file is part of systemd.
       5             : 
       6             :   Copyright 2010-2012 Lennart Poettering
       7             : 
       8             :   systemd is free software; you can redistribute it and/or modify it
       9             :   under the terms of the GNU Lesser General Public License as published by
      10             :   the Free Software Foundation; either version 2.1 of the License, or
      11             :   (at your option) any later version.
      12             : 
      13             :   systemd is distributed in the hope that it will be useful, but
      14             :   WITHOUT ANY WARRANTY; without even the implied warranty of
      15             :   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
      16             :   Lesser General Public License for more details.
      17             : 
      18             :   You should have received a copy of the GNU Lesser General Public License
      19             :   along with systemd; If not, see <http://www.gnu.org/licenses/>.
      20             : ***/
      21             : 
      22             : #include <errno.h>
      23             : #include <stdlib.h>
      24             : #include <unistd.h>
      25             : 
      26             : #include "util.h"
      27             : #include "label.h"
      28             : #include "path-util.h"
      29             : #include "dev-setup.h"
      30             : 
      31           0 : int dev_setup(const char *prefix, uid_t uid, gid_t gid) {
      32             :         static const char symlinks[] =
      33             :                 "-/proc/kcore\0"     "/dev/core\0"
      34             :                 "/proc/self/fd\0"    "/dev/fd\0"
      35             :                 "/proc/self/fd/0\0"  "/dev/stdin\0"
      36             :                 "/proc/self/fd/1\0"  "/dev/stdout\0"
      37             :                 "/proc/self/fd/2\0"  "/dev/stderr\0";
      38             : 
      39             :         const char *j, *k;
      40             :         int r;
      41             : 
      42           0 :         NULSTR_FOREACH_PAIR(j, k, symlinks) {
      43           0 :                 _cleanup_free_ char *link_name = NULL;
      44             :                 const char *n;
      45             : 
      46           0 :                 if (j[0] == '-') {
      47           0 :                         j++;
      48             : 
      49           0 :                         if (access(j, F_OK) < 0)
      50           0 :                                 continue;
      51             :                 }
      52             : 
      53           0 :                 if (prefix) {
      54           0 :                         link_name = prefix_root(prefix, k);
      55           0 :                         if (!link_name)
      56           0 :                                 return -ENOMEM;
      57             : 
      58           0 :                         n = link_name;
      59             :                 } else
      60           0 :                         n = k;
      61             : 
      62           0 :                 r = symlink_label(j, n);
      63           0 :                 if (r < 0)
      64           0 :                         log_debug_errno(r, "Failed to symlink %s to %s: %m", j, n);
      65             : 
      66           0 :                 if (uid != UID_INVALID || gid != GID_INVALID)
      67           0 :                         if (lchown(n, uid, gid) < 0)
      68           0 :                                 log_debug_errno(errno, "Failed to chown %s: %m", n);
      69             :         }
      70             : 
      71           0 :         return 0;
      72             : }