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=0.1.7
  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 - $opt_quiet))
  39
  40 [ -e "$HOME/.mdiskrc" ] && . "$HOME/.mdiskrc"
  41
  42 T_BOLD=$(tput bold)
  43 T_GREEN=$(tput setaf 2)
  44 T_RED=$(tput setaf 1)
  45 T_RESET=$(tput sgr0)
  46
  47 if test "$opt_help" = "1"; then
  48         test $opt_verbose -gt 0 && { echo; echo $progname $VERSION; }
  49         cat <<END
  50
  51 Mount a LUKS-encrypted disk under /media/.
  52
  53 Usage: $progname [options] DISKNAME
  54
  55 Options:
  56
  57   -h, --help
  58     Show this help.
  59   -q, --quiet
  60     Be more quiet. Can be repeated to increase silence.
  61   -v, --verbose
  62     Increase level of verbosity. Can be repeated.
  63   -u, --umount
  64     Unmount the disk.
  65   --version
  66     Print version information.
  67
  68 Environment variables
  69
  70   MDISK_KEY_FILE
  71     Full path to text file with passphrase for encrypted drives.
  72
  73 Files
  74
  75   \$HOME/.mdiskrc
  76     Init file. A regular shell script that can be used to initialize
  77     environment variables and run commands before normal program
  78     execution.
  79
  80 END
  81         exit 0
  82 fi
  83
  84 msg() {
  85         test $1 -gt $opt_verbose && return;
  86         shift
  87         echo "$progname: $*" >&2
  88 }
  89
  90 err() {
  91         echo "$progname: $T_BOLD$T_RED$*$T_RESET" >&2
  92         exit 1
  93 }
  94
  95 is_active() {
  96         sudo cryptsetup status $disk | grep -q "/dev/mapper/$disk is active"
  97 }
  98
  99 is_mounted() {
 100         df | grep -q "/media/$disk\$" && return 0
 101         return 1
 102 }
 103
 104 disk=$(echo "$1" | sed 's.^/media/..; s./$..')
 105 [ -z "$disk" ] && err No disk specified
 106
 107 sudo blkid | grep -q "LABEL=\"$disk\"" || err $disk: Disk not found in blkid
 108
 109 if [ "$opt_umount" != "1" ]; then
 110         is_mounted $disk && err $disk: Already mounted
 111         device=$(blkid -L $disk)
 112         msg 1 device = \"$device\"
 113         [ -z "$device" ] && err Cannot get device for $disk
 114         echo "$device" | grep -q ^/dev/ || err $device: Malformed device name
 115         is_active $disk \
 116         || sudo cryptsetup luksOpen \
 117         $([ -n "$MDISK_KEY_FILE" ] && echo "--key-file $MDISK_KEY_FILE") \
 118         $device $disk && mount /media/$disk
 119         is_mounted $disk \
 120         && msg 0 $T_BOLD$T_GREEN$disk mounted on /media/$disk$T_RESET \
 121         || err $disk: mount failed
 122 else
 123         is_mounted $disk && umount /media/$disk
 124         is_mounted $disk && err /media/$disk: umount failed
 125         sudo cryptsetup luksClose $disk
 126         sync
 127         is_active $disk && err $disk is still active
 128         msg 0 $T_BOLD$T_GREEN$disk is unmounted and closed$T_RESET
 129 fi
 130
 131 # vim: set ts=8 sw=8 sts=8 noet fo+=w tw=79 fenc=UTF-8 :