#!/bin/sh
# Script for unmounting filesystems

# Set askpass program for authentication
#export SUDO_ASKPASS=/usr/bin/ssh-askpass

# Get list of unmountable filesystems excluding critical ones (/, /home, /boot, etc...)
exclude="\(/\|/boot\|/boot/efi\|/var\|/tmp\|/home\)$"
parts="$(lsblk -lp | grep "\(part\|crypt\)\s*/" | grep -v "$exclude" | awk '{print $7,"-",$4}')"
[ "$parts" = "" ] && exit 0

# Get filesystem to unmount from user
crypt=0
select="$(echo "$parts" | dmenu -i -p "Select filesystem to unmount" | cut -d ' ' -f 1)"
[ "$select" = "" ] && exit 0
dev="$(lsblk -lp | grep "$select" | awk '{print $1}')"
[ "$(lsblk -no TYPE $dev)" = "crypt" ] && crypt=1

# Unmount the filesystem
umount=0
sudo umount $select && pgrep -x dunst && \
	notify-send "Unmounted $select ($dev)" && umount=1 \
	|| notify-send "Error: unable to unmount $select" "Are you in it?"

[ $crypt -eq 1 -a $umount -eq 1 ] && sudo cryptsetup close $dev && pgrep -x dunst && \
		notify-send "Unmapped $dev" && exit 14