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=0.2.0
  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 "$1" in
  22         -a|--all) opt_all=1; shift ;;
  23         -h|--help) opt_help=1; shift ;;
  24         -q|--quiet) opt_quiet=$(($opt_quiet + 1)); shift ;;
  25         -u|--umount) opt_umount=1; shift ;;
  26         -v|--verbose) opt_verbose=$(($opt_verbose + 1)); shift ;;
  27         --version) echo $progname $VERSION; exit 0 ;;
  28         --) shift; break ;;
  29         *)
  30                 if printf '%s\n' "$1" | grep -q ^-; then
  31                         echo "$progname: $1: Unknown option" >&2
  32                         exit 1
  33                 else
  34                         break
  35                 fi
  36         break ;;
  37         esac
  38 done
  39 opt_verbose=$(($opt_verbose - $opt_quiet))
  40
  41 [ -e "$HOME/.mdiskrc" ] && . "$HOME/.mdiskrc"
  42
  43 T_BOLD=$(tput bold)
  44 T_GREEN=$(tput setaf 2)
  45 T_RED=$(tput setaf 1)
  46 T_RESET=$(tput sgr0)
  47
  48 if test "$opt_help" = "1"; then
  49         test $opt_verbose -gt 0 && { echo; echo $progname $VERSION; }
  50         cat <<END
  51
  52 Mount a LUKS-encrypted disk under /media/.
  53
  54 Usage: $progname [options] DISKNAME
  55
  56 Options:
  57
  58   -a, --all
  59     Loop through all directory names under /media/ and mount or unmount
  60     all corresponding disks.
  61   -h, --help
  62     Show this help.
  63   -q, --quiet
  64     Be more quiet. Can be repeated to increase silence.
  65   -v, --verbose
  66     Increase level of verbosity. Can be repeated.
  67   -u, --umount
  68     Unmount the disk.
  69   --version
  70     Print version information.
  71
  72 Environment variables
  73
  74   MDISK_KEY_FILE
  75     Full path to text file with passphrase for encrypted drives.
  76
  77 Files
  78
  79   \$HOME/.mdiskrc
  80     Init file. A regular shell script that can be used to initialize
  81     environment variables and run commands before normal program
  82     execution.
  83
  84 END
  85         exit 0
  86 fi
  87
  88 msg() {
  89         test $1 -gt $opt_verbose && return;
  90         shift
  91         echo "$progname: $*" >&2
  92 }
  93
  94 err() {
  95         echo "$progname: $T_BOLD$T_RED$*$T_RESET" >&2
  96         exit 1
  97 }
  98
  99 is_active() {
 100         sudo cryptsetup status $disk | grep -q "/dev/mapper/$disk is active"
 101 }
 102
 103 is_in_blkid() {
 104         sudo blkid | grep -q "LABEL=\"$1\"" && return 0
 105         return 1
 106 }
 107
 108 is_mounted() {
 109         df | grep -q "/media/$disk\$" && return 0
 110         return 1
 111 }
 112
 113 strip_diskname() {
 114         echo $(echo "$1" | sed 's.^/media/..; s./$..')
 115 }
 116
 117 if [ "$opt_all" = "1" ]; then
 118         for f in /media/*; do
 119                 is_in_blkid $(strip_diskname $f) || continue
 120                 if [ "$opt_umount" = "1" ]; then
 121                         $0 -u $f
 122                 else
 123                         $0 $f
 124                 fi
 125         done
 126         exit
 127 fi
 128
 129 disk=$(strip_diskname $1)
 130 [ -z "$disk" ] && err No disk specified
 131
 132 is_in_blkid $disk || err $disk: Disk not found in blkid
 133
 134 if [ "$opt_umount" != "1" ]; then
 135         is_mounted $disk && {
 136                 msg 0 $T_BOLD$T_GREEN$disk: Already mounted$T_RESET
 137                 exit 0
 138         }
 139         device=$(blkid -L $disk)
 140         msg 1 device = \"$device\"
 141         [ -z "$device" ] && err Cannot get device for $disk
 142         echo "$device" | grep -q ^/dev/ || err $device: Malformed device name
 143         is_active $disk \
 144         || sudo cryptsetup luksOpen \
 145         $([ -n "$MDISK_KEY_FILE" ] && echo "--key-file $MDISK_KEY_FILE") \
 146         $device $disk && mount /media/$disk
 147         is_mounted $disk \
 148         && msg 0 $T_BOLD$T_GREEN$disk mounted on /media/$disk$T_RESET \
 149         || err $disk: mount failed
 150 else
 151         is_mounted $disk && umount /media/$disk
 152         is_mounted $disk && err /media/$disk: umount failed
 153         sudo cryptsetup luksClose $disk
 154         sync
 155         is_active $disk && err $disk is still active
 156         msg 0 $T_BOLD$T_GREEN$disk is unmounted and closed$T_RESET
 157 fi
 158
 159 # vim: set ts=8 sw=8 sts=8 noet fo+=w tw=79 fenc=UTF-8 :