redpitaya-puzzlefw/sw/buildroot_overlay/etc/init.d/S10prepare_dropbear.sh

#!/bin/sh
#
# Load SSH host key from SD card.
#

. /opt/puzzlefw/lib/functions.sh

start() {

    # If host key exists, do nothing.
    [ -f /etc/dropbear/dropbear_ed25519_host_key ] && return

    # If /etc/dropbear is a symlink, delete it.
    [ -L /etc/dropbear ] && rm /etc/dropbear

    # Create directory /etc/dropbear if it does not exist.
    mkdir -p /etc/dropbear

    # Try to copy SSH host key from configuration files.
    if ! cp -p ${CONFIG_DIR}/dropbear_ed25519_host_key /etc/dropbear ; then
        echo "WARNING: Failed to load SSH host key from SD card" >&2
        echo "Generating new SSH host key." >&2
        dropbearkey -t ed25519 -f ${CONFIG_DIR}/dropbear_ed25519_host_key.new
        sync_config dropbear_ed25519_host_key
        cp -p ${CONFIG_DIR}/dropbear_ed25519_host_key /etc/dropbear
    fi

    chmod 0600 /etc/dropbear/dropbear_ed25519_host_key
}

case "$1" in
  start)
    start
    ;;
  stop|restart|reload)
    ;;
  *)
    echo "Usage: $0 start"
    exit 1
esac