ETCD_DATA_DIR="/var/lib/etcd"

pre_upgrade() {
cat << EOF
	To upgrade an existing etcd deployment to 2.2, you must be running 2.1.
	If you’re running a version of etcd before 2.1, you must upgrade to 2.1 before upgrading to 2.2.
        And you should, probably, read the following:
		/usr/share/doc/etcd/04_to_2_snapshot_migration.md
		/usr/share/doc/etcd/upgrade_2_1.md
		/usr/share/doc/etcd/upgrade_2_2.md
EOF
}

post_install() {
    mkdir -p "${ETCD_DATA_DIR}"

    # create an etcd user
    id -u etcd &>/dev/null || useradd -r -M -U -d /dev/null -s /bin/nologin etcd

    chown -R etcd:etcd "${ETCD_DATA_DIR}"
}

post_upgrade() {
    post_install
}