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#!/usr/bin/sh
command -v ask_for_password > /dev/null || . /lib/dracut-crypt-lib.sh
# loop_decrypt mnt_point keypath keydev device
#
# Decrypts symmetrically encrypted key to standard output.
#
# mnt_point - mount point where <keydev> is already mounted
# keypath - LUKS encrypted loop file path relative to <mnt_point>
# keydev - device on which key resides; only to display in prompt
# device - device to be opened by cryptsetup; only to display in prompt
loop_decrypt() {
local mntp="$1"
local keypath="$2"
local keydev="$3"
local device="$4"
local key
key="/dev/mapper/$(str_replace "loop-$keydev-$mntp-$keypath" '/' '-')"
if [ ! -b "$key" ]; then
local loopdev
local opts
loopdev=$(losetup -f "${mntp}/${keypath}" --show)
opts="-d - luksOpen $loopdev ${key##*/}"
ask_for_password \
--cmd "cryptsetup $opts" \
--prompt "Password ($keypath on $keydev for $device)" \
--tty-echo-off
[ -b "$key" ] || die "Failed to unlock $keypath on $keydev for $device."
printf "%s\n" "cryptsetup luksClose \"$key\"" > "${hookdir}/cleanup/crypt-loop-cleanup-10-${key##*/}.sh"
printf "%s\n" "losetup -d \"$loopdev\"" > "${hookdir}/cleanup/crypt-loop-cleanup-20-${loopdev##*/}.sh"
fi
cat "$key"
}