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#!/bin/bash
#
# mount-media
#

# Parameters
MEDIA="$1"
VOLUME="$2"
BASENAME="`basename $0`"
MAPPING="$MEDIA"
MOUNTPOINT="/media/$MEDIA"

# Check media config
if [ -z "$MEDIA" ]; then
  echo "usage: $BASENAME <media> [volume]"
  echo "example: $BASENAME mymedia sdb1"
  exit 1
fi

# Set sudo config
if [ "`whoami`" != 'root' ]; then
  sudo="sudo"
fi

# Check volume config
if [ -z "$VOLUME" ]; then
  VOLUME="sdb1"
fi

# Disk and device config
DISK="`echo ${VOLUME} | sed -e s/[0-9]\$//g`"
DEVICE="/dev/$DISK"

# Check if LVM
if $sudo lvdisplay /dev/$MEDIA/root &> /dev/null; then
  LVM="yes"
  DEVICE="/dev/$MEDIA/root"
  MAPPING="$MAPPING-unlocked"
fi

if [ "$BASENAME" == "mount-media" ]; then
  if [ -e "$DEVICE" ]; then
    echo "Checking drive health status..."
    $sudo smartctl -H /dev/$DISK

    echo "Disabling STANDBY on drive..."
    $sudo sdparm --clear STANDBY -6 /dev/$DISK
  fi

  if [ "$LVM" == "yes" ]; then
    $sudo vgchange -a y $MEDIA
  fi

  echo "Initializing crypto layer..."
  $sudo cryptsetup luksOpen $DEVICE $MAPPING && \

  echo "Checking filesystem..."
  $sudo fsck -v -y /dev/mapper/$MAPPING && \

  echo "Mounting volume at $MOUNTPOINT..."
  $sudo mkdir -p $MOUNTPOINT
  $sudo mount /dev/mapper/$MAPPING $MOUNTPOINT
elif [ "$BASENAME" == "umount-media" ]; then
  $sudo umount $MOUNTPOINT && \
  $sudo cryptsetup luksClose $MAPPING

  if [ "$LVM" == "yes" ]; then
    $sudo vgchange -a n $MEDIA
  fi
fi