Manually open and mount crypted device

cryptopen.sh

#!/usr/bin/env bash

# About: Manually open and mount crypted device
# Location: /usr/local/bin/
# Usage: 
#   $ cryptopen /home/dir
#   gets dirs, device names etc automatically from
#   /etc/fstab:
#     /dev/mapper/cryptdir     /home/dir      ext3    noauto,defaults  0   0
#   /etc/crypttab:
#     cryptdir    /dev/disk/by-id/ata-Hitachi_HDT731110SLC219_STF389MS33DSGK-part1 - noauto,nofail,luks


readonly FSTABPATH=/etc/fstab
readonly CRYPTTABPATH=/etc/crypttab
readonly DIR=$1

# I avoid grep to avoid mistaken matches
found=0
while IFS=" " read -r fdev fpath fremainder
do
	if [ "${DIR}" = "${fpath}" ]
	then
		name=${fdev#/dev/mapper/}
		while IFS=" " read -r cname cdev cpass copts cremainder
		do
			if [ "${name}" = "${cname}" ]
			then
				found=1
				break 2
				# read confuses cryptsetup, so i put it at the end of the script
			fi
		done < "${CRYPTTABPATH}"
	fi
done < "${FSTABPATH}"

if [ "${found}" -ne 1 ]
then
	echo "Not found: ${DIR}"
	exit 1
fi

echo "open ${cdev} ${name}"
/sbin/cryptsetup open "${cdev}" "${name}" \
	&& /sbin/e2fsck -v -y "${fdev}" \
	&& /bin/mount "${fdev}" "${DIR}"