# Install a static ssh host key, for use in development
IMAGE_FEATURES[validitems] += "dev-ssh-hostkey"
ROOTFS_POSTPROCESS_COMMAND += "${@feature_enabled('debug-tweaks dev-ssh-hostkey', 'dev_ssh_hostkey; ', d)}"
DEVELOPER_SSH_HOSTKEY ?= "${OE_USER_DIR}/ssh-keys/developer_host_rsa"
DEVELOPER_SSH_HOSTKEY_CREATE ?= "1"
dev_ssh_hostkey() {
        local key_src="${DEVELOPER_SSH_HOSTKEY}"
        [ "$key_src" ] || {
                bbnote "DEVELOPER_SSH_HOSTKEY not set; set to a filename "\
                       "to have it installed as the SSH host key"
                return 0
        }
        [ -d "${sshconfdir}" ] || {
                bbnote "SSH does not seem to be installed in the image, will "\
                       "not install host key"
                return 0
        }

        dev_ssh_verify_hostkey "$key_src" || {
                bbwarn "Developer SSH hostkey '$key_src' does not exist; ignoring"
                return 0
        }

        bbnote "Installing '$key_src' as the SSH host key for the image (debug-tweaks)"
        install -m 0600 "$key_src" "${sshconfdir}/ssh_host_rsa_key"
        install -m 0644 "$key_src.pub" "${sshconfdir}/ssh_host_rsa_key.pub"
}

# dev_ssh_verify_hostkey returns success if the ssh key, given as parameter,
# exists. If the key does not exist, the function will generate it unless
# requested not to by setting DEVELOPER_SSH_HOSTKEY_CREATE to anything
# other than Y, y, 1 or yes.
dev_ssh_verify_hostkey() {
        [ ! -e "$1" ] || return 0

        case "${DEVELOPER_SSH_HOSTKEY_CREATE}" in
                [Yy1]|yes)  ;;
                *) return 1 ;;
        esac

        # If the specified directory doesn't exist, create it first
        [ -d "${1%/*}" ] || mkdir -p "${1%/*}"

        ssh-keygen -t rsa -N '' -b 2048 \
                   -C "developer hostkey for $LOGNAME" \
                   -f "$1" ||
                bbwarn "ssh-keygen failed to generate a developer hostkey"
}