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uname -a: Linux acloudg.aryanict.com 4.18.0-513.9.1.lve.el8.x86_64 #1 SMP Mon Dec 4 15:01:22 UTC
2023 x86_64 

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/usr/lib/dracut/modules.d/91crypt-loop/   drwxr-xr-x
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Viewing file:     crypt-loop-lib.sh (1.25 KB)      -rwxr-xr-x

#!/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="/dev/mapper/$(str_replace "loop-$keydev-$mntp-$keypath" '/' '-')"

    if [ ! -b $key ]; then
        local loopdev=$(losetup -f "${mntp}/${keypath}" --show)
        local 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
}