osi-tools/osi-mount

#!/usr/bin/env bash
# 2018 Luke Shumaker
{
	set -euE
	source "${BASH_SOURCE[0]%/*}/lib/osi.sh"
	needs_root

	arg_device=$1
	arg_mountpoint=$2
	arg_cmd=("${@:3}")

	unshare --mount sh -c "mount --make-rslave / && mount -- ${arg_device@Q} ${arg_mountpoint@Q} && exec -- ${arg_cmd[*]@Q}"
}