lxc-create will pass "--mapped-uid" and "--mapped-gid" into the
template, if there's an "lxc.idmap" option in the config file. We now
support getting these parameters as options.
Since an "lxc.idmap" option in the config makes lxc-create already
change the userns, we cannot support it. Therefore, we error out if we
see these options. Instead, we write the "lxc.idmap" options ourselves
based on the "--uidmap" and "--gidmap" options passed by the user.
This script can be used as LXC template to install a Debian into a
directory using `mmdebstrap`. It's intended use is to create a container
filesystem with appropriate uids/gids for use in an unprivileged
container. The script assumes that it runs as root and only changes the
userns to install Debian.
MasterofJOKers