[Unit]
Description=Overlay filesystem over /etc
DefaultDependencies=no
Conflicts=umount.target
Before=local-fs.target umount.target systemd-networkd.service
After=swap.target \x2eov.mount

[Service]
Type=oneshot
ExecStart=/bin/mkdir /.ov/etc-u
ExecStart=/bin/mkdir /.ov/etc-w
# Moving /etc/machine-id. Cannot --move, we have to --bind.
ExecStart=/bin/touch /.ov/etc-machine-id
ExecStart=/bin/mount --bind /etc/machine-id /.ov/etc-machine-id
ExecStart=/bin/umount /etc/machine-id
ExecStart=/bin/mount overlay -t overlay /etc -olowerdir=/etc,upperdir=/.ov/etc-u,workdir=/.ov/etc-w
ExecStart=/bin/mount --bind /.ov/etc-machine-id /etc/machine-id
ExecStart=/bin/umount /.ov/etc-machine-id