#!/bin/dash

if mountpoint -q -- "${HOME}/.var/opt/element/ElementCrypt.d"; then
	printf '%s\n' 'mount-element: already mounted' >&2
elif test -e /dev/mapper/ElementCrypt; then
	asroot env ELEMENT_DIR="${HOME}/.var/opt/element" sh -ec \
		'mount -- /dev/mapper/ElementCrypt "${ELEMENT_DIR}/ElementCrypt.d"'
else
	gpg --decrypt -- "${HOME}/.var/opt/element/ElementCrypt.key" | \
	key2root -k ElementCrypt env \
		ELEMENT_IMG="${HOME}/.var/opt/element/ElementCrypt.img" \
		ELEMENT_DIR="${HOME}/.var/opt/element" \
		ELEMENT_DEV="$(losetup | sed 's/\s\+/ /g' | cut -d ' ' -f 1,6 | \
		              sed -n 's#\(/[^ ]*\) '"$(realpath -- "${HOME}/.var/opt/element/ElementCrypt.img")"'$#\1#p' | sed 1q)" \
		sh -ec '
			if test -z "${ELEMENT_DEV}"; then
				ELEMENT_DEV="$(losetup --show -f -P -- "${ELEMENT_IMG}")"
			fi
			cryptsetup -d - -- open "${ELEMENT_DEV}" ElementCrypt
			mount -- /dev/mapper/ElementCrypt "${ELEMENT_DIR}/ElementCrypt.d"
		'
fi