User start a chroot only for nesting app

This script can be used to run a nested system with rootfs. It uses unshare, therefore, no root login is used. The counterpart is that you can't login as another user.

Here an example usage :

# chroot_start.sh ROOT [MOUNTS:] HOME CMDLINE 

# chroot on ../distrib
# The following directories will be mounted
#  ./home on /home/ali
#  ./etc on /etc
# The HOME variable is set as /home/ali
# Finally, we run gvim from this directory
chroot_start.sh ../distrib home:/home/ali etc: /home/ali "gvim"

For what ?

The aim is to play games using another linux distribution in a nested environnement. You can use this script if you have a linux rootfs in userspace (e.g. an lxc unprivileged container) or with sudo on any rootfs.