Make dropbear not start with 'nodropbear' or 'dropbear=no' kernel arg

nodropbear

#!/bin/sh

: <<'README'

Make dropbear not start with 'nodropbear' or 'dropbear=no' kernel arg.

Put this script under /etc/initramfs-tools/scripts/init-top/ and update
initramfs.

README

PREREQ=""

prereqs() {
    echo "$PREREQ"
}

case "$1" in
    prereqs)
        prereqs
        exit 0 ;;
esac

# shellcheck disable=SC2013
for arg in $(cat /proc/cmdline); do
    case "$arg" in
        nodropbear|dropbear=no)
            if [ -e /sbin/dropbear ]; then
                # There is '[ -x /sbin/dropbear ] || exit 0' early in
                # /usr/share/initramfs-tools/scripts/init-premount/dropbear
                chmod -x /sbin/dropbear
            fi

            break ;;
    esac
done