diskimage-builder/diskimage_builder/elements/devuser/extra-data.d/50-devuser

#!/bin/bash

if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
    set -x
fi
set -eu
set -o pipefail

if [ -n "$DIB_DEV_USER_AUTHORIZED_KEYS" ]; then
    if [ -f "$DIB_DEV_USER_AUTHORIZED_KEYS" ]; then
        cat $DIB_DEV_USER_AUTHORIZED_KEYS >> $TMP_HOOKS_PATH/devuser-ssh-authorized-keys
    fi
else
    for fmt in rsa dsa; do
        if [ -f "$HOME/.ssh/id_$fmt.pub" ]; then
            cat $HOME/.ssh/id_$fmt.pub >> $TMP_HOOKS_PATH/devuser-ssh-authorized-keys
            break
        fi
    done
fi