src/shared/udev-util.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2017 Zbigniew Jędrzejewski-Szmek
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <string.h>
  21
  22 #include "fileio.h"
  23 #include "log.h"
  24 #include "string-util.h"
  25 #include "udev-util.h"
  26
  27 int udev_parse_config(void) {
  28         _cleanup_free_ char *val = NULL;
  29         const char *log;
  30         size_t n;
  31         int r;
  32
  33         r = parse_env_file("/etc/udev/udev.conf", NEWLINE, "udev_log", &val, NULL);
  34         if (r == -ENOENT || !val)
  35                 return 0;
  36         if (r < 0)
  37                 return r;
  38
  39         /* unquote */
  40         n = strlen(val);
  41         if (n >= 2 &&
  42             ((val[0] == '"' && val[n-1] == '"') ||
  43              (val[0] == '\'' && val[n-1] == '\''))) {
  44                 val[n - 1] = '\0';
  45                 log = val + 1;
  46         } else
  47                 log = val;
  48
  49         /* we set the udev log level here explicitly, this is supposed
  50          * to regulate the code in libudev/ and udev/. */
  51         r = log_set_max_level_from_string_realm(LOG_REALM_UDEV, log);
  52         if (r < 0)
  53                 log_debug_errno(r, "/etc/udev/udev.conf: failed to set udev log level '%s', ignoring: %m", log);
  54
  55         return 0;
  56 }