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#!/usr/bin/env bash
# Description: Toggle mount status of a device using pmount
# If the device is not mounted, it will be mounted.
# If the device is mounted, it will be unmounted and powered down.
#
# Dependencies: lsblk, pmount (optional), udisks2
#
# Usage: Runs `lsblk` on 'l', unmounts all USB HDDs on 'u', exits on 'Return`.
#
# Notes:
# - The script uses Linux-specific lsblk to list block devices. Alternatives:
# macOS: "diskutil list"
# BSD: "geom disk list"
# - The script uses udisksctl (from udisks2) to power down devices. This is also Linux-specific.
# Users on non-Linux platforms can comment it and use an alternative to power-down disks.
#
# Shell: Bash
# Author: Arun Prakash Jana
prompt="device name [e.g. sdXn] ('l'ist, 'u'nmount all USB, 'q'uit): "
previous_input=""
restore_previous_input() {
if [ -n "$previous_input" ]; then
READLINE_LINE="$previous_input"
READLINE_POINT=${#READLINE_LINE}
fi
}
clear_input() {
READLINE_LINE=""
READLINE_POINT=0
}
bind -x '"\e[A":restore_previous_input'
bind -x '"\e[B":clear_input'
lsblk
printf "\nEnsure you aren't still in the mounted device.\n"
read -r -e -p "$prompt" dev
while [ -n "$dev" ]; do
previous_input="$dev"
if [ "$dev" = "l" ]; then
lsblk
elif [ "$dev" = "q" ]; then
exit
elif [ "$dev" = "u" ]; then
usb_devs=$(lsblk -ndo NAME,TRAN | awk '$2=="usb"{print $1}')
if [ -z "$usb_devs" ]; then
echo "No USB block devices found."
else
for disk in $usb_devs; do
# Get only real partitions (e.g. sda1), skip device-mapper entries like luks-*
parts=$(lsblk -nlpo NAME,TYPE "/dev/$disk" | awk '$2=="part"{print $1}')
if [ -z "$parts" ]; then
echo "/dev/$disk has no partitions, skipping."
continue
fi
mounted=0
for part in $parts; do
mnt=$(lsblk -n "$part" -o MOUNTPOINT | sed '/^$/d')
# Check if this partition or any child (e.g. LUKS) is mounted
child_mnt=$(lsblk -nro MOUNTPOINT "$part" | sed '/^$/d')
if [ -z "$mnt" ] && [ -z "$child_mnt" ]; then
continue
fi
mounted=1
if type pumount >/dev/null 2>&1; then
sync "$child_mnt"
pumount "$part"
prc=$?
elif lsblk -n "$part" -o FSTYPE | grep -q "crypto_LUKS"; then
dev_map=$(udisksctl info -b "$part" | grep "CleartextDevice" | grep -o "dm_2d[[:digit:]]*" | sed "s/_2d/-/")
sync "$child_mnt"
udisksctl unmount -b "/dev/$dev_map" --no-user-interaction >/dev/null
prc=$?
udisksctl lock -b "$part" --no-user-interaction >/dev/null
else
sync "$mnt"
udisksctl unmount -b "$part" --no-user-interaction >/dev/null
prc=$?
fi
if [ $prc -eq 0 ]; then
echo "$part unmounted."
else
echo "Failed to unmount $part."
fi
done
if [ $mounted -eq 0 ]; then
echo "/dev/$disk has no mounted partitions, skipping."
continue
fi
if udisksctl power-off -b "/dev/$disk" --no-user-interaction 2>/dev/null; then
echo "/dev/$disk ejected."
fi
done
fi
else
# LUKS volumes mounted with udisksctl appear differently than with pmount
if grep -qs "$dev " /proc/mounts || [ -n "$(lsblk -n "/dev/$dev" -o MOUNTPOINT)" ]; then
sync "$(lsblk -n "/dev/$dev" -o MOUNTPOINT | sed "/^$/d")"
if type pumount >/dev/null 2>&1; then
pumount "/dev/$dev"
exit_code="$?"
else
# Unlike pmount, udisksctl does not transparently handle LUKS volumes
# We need to manually get the unlocked device, unmount it, and then lock the volume
if lsblk -n "/dev/$dev" -o FSTYPE | grep "crypto_LUKS" >/dev/null; then
dev_map="$(udisksctl info -b /dev/"$dev" | grep "CleartextDevice" | grep -o "dm_2d[[:digit:]]*" | sed "s/_2d/-/")"
udisksctl unmount -b "/dev/$dev_map" --no-user-interaction >/dev/null
exit_code="$?"
udisksctl lock -b "/dev/$dev" --no-user-interaction >/dev/null
else
udisksctl unmount -b "/dev/$dev" --no-user-interaction >/dev/null
exit_code="$?"
fi
fi
if [ $exit_code -eq 0 ]; then
echo "/dev/$dev unmounted."
if udisksctl power-off -b "/dev/$dev" --no-user-interaction; then
echo "/dev/$dev ejected."
fi
fi
elif [ -b "/dev/$dev" ]; then
if type pmount >/dev/null 2>&1; then
pmount "/dev/$dev"
exit_code="$?"
else
# Unlike pmount, udisksctl does not transparently handle LUKS volumes
# We need to manually get the unlocked device and mount that instead of the volume itself
if [ "$(lsblk "/dev/$dev" -n -o FSTYPE)" = "crypto_LUKS" ]; then
dev_map=$(udisksctl unlock -b "/dev/$dev" --no-user-interaction | grep -o "dm-[[:digit:]]*")
udisksctl mount -b "/dev/$dev_map" --no-user-interaction >/dev/null
exit_code="$?"
else
udisksctl mount -b "/dev/$dev" --no-user-interaction >/dev/null
exit_code="$?"
fi
fi
if [ $exit_code -eq 0 ]; then
sleep 1
echo "/dev/$dev mounted to $(lsblk -n "/dev/$dev" -o MOUNTPOINT | sed "/^$/d")."
fi
else
echo "/dev/$dev does not exist or is not a block device."
fi
fi
echo
read -r -e -p "$prompt" dev
done
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