mdisk

   1 #!/bin/sh
   2
   3 #==============================================================================
   4 # mdisk
   5 # File ID: 0548a2d2-ea04-11ed-b5e0-83850402c3ce
   6 #
   7 # Mount a LUKS-encrypted disk under /media/
   8 #
   9 # Author: Øyvind A. Holm <sunny@sunbase.org>
  10 # License: GNU General Public License version 2 or later.
  11 #==============================================================================
  12
  13 progname=mdisk
  14 VERSION=0.1.0
  15
  16 opt_help=0
  17 opt_quiet=0
  18 opt_umount=0
  19 opt_verbose=0
  20 while test -n "$1"; do
  21         case "$1" in
  22         -h|--help) opt_help=1; shift ;;
  23         -q|--quiet) opt_quiet=$(($opt_quiet + 1)); shift ;;
  24         -u|--umount) opt_umount=1; shift ;;
  25         -v|--verbose) opt_verbose=$(($opt_verbose + 1)); shift ;;
  26         --version) echo $progname $VERSION; exit 0 ;;
  27         --) shift; break ;;
  28         *)
  29                 if printf '%s\n' "$1" | grep -q ^-; then
  30                         echo "$progname: $1: Unknown option" >&2
  31                         exit 1
  32                 else
  33                         break
  34                 fi
  35         break ;;
  36         esac
  37 done
  38 opt_verbose=$(($opt_verbose - $opt_quiet))
  39
  40 if test "$opt_help" = "1"; then
  41         test $opt_verbose -gt 0 && { echo; echo $progname $VERSION; }
  42         cat <<END
  43
  44 Mount a LUKS-encrypted disk under /media/.
  45
  46 Usage: $progname [options]
  47
  48 Options:
  49
  50   -h, --help
  51     Show this help.
  52   -q, --quiet
  53     Be more quiet. Can be repeated to increase silence.
  54   -v, --verbose
  55     Increase level of verbosity. Can be repeated.
  56   -u, --umount
  57     Unmount the disk.
  58   --version
  59     Print version information.
  60
  61 END
  62         exit 0
  63 fi
  64
  65 msg() {
  66         test $1 -gt $opt_verbose && return;
  67         shift
  68         echo "$progname: $*" >&2
  69 }
  70
  71 err() {
  72         echo "$progname: $*" >&2
  73         exit 1
  74 }
  75
  76 is_mounted() {
  77         df | grep -q "/media/$disk\$" && return 0
  78         return 1
  79 }
  80
  81 disk=$1
  82 [ -z "$disk" ] && err No disk specified
  83
  84 blkid | grep -q "LABEL=\"$disk\"" || err $disk: Disk not found in blkid
  85
  86 if [ "$opt_umount" != "1" ]; then
  87         is_mounted $disk && err $disk: Already mounted
  88         device=$(blkid -L $disk)
  89         msg 1 device = \"$device\"
  90         [ -z "$device" ] && err Cannot get device for $disk
  91         echo "$device" | grep -q ^/dev/ || err $device: Malformed device name
  92         sudo cryptsetup status $disk \
  93         | grep -q "/dev/mapper/$disk is active" \
  94         || sudo cryptsetup luksOpen $device $disk && mount /media/$disk
  95         is_mounted $disk && msg 0 $disk mounted on /media/$disk \
  96         || err $disk: mount failed
  97 else
  98         is_mounted $disk && umount /media/$disk
  99         is_mounted $disk && err /media/$disk: umount failed
 100         sudo cryptsetup luksClose $disk
 101         sync
 102         msg 0 $disk is unmounted and closed
 103 fi
 104
 105 # vim: set ts=8 sw=8 sts=8 noet fo+=w tw=79 fenc=UTF-8 :