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#!/bin/sh
err() {
echo "$@" >&2
exit 1
}
if [ "$(id -u)" -ne 0 ]; then
err 'Please run as root'
fi
if [ -z "$1" ]
then
err 'Specify path as the first argument'
fi
ensure() {
{ set +x; } 2>/dev/null
[ $# -lt 1 ] && return 0
$@ || err failed executing: "$@"
set -x
}
set -xu
umask 022
ensure export chroot_dir="$(ensure realpath -- "$1")"
umount "${chroot_dir}/dev"
umount "${chroot_dir}/proc"
umount "${chroot_dir}/sys"
ensure mount -o bind /dev "${chroot_dir}/dev"
ensure mount -t proc none "${chroot_dir}/proc"
ensure mount -o bind /sys "${chroot_dir}/sys"
{ set +x; } 2>/dev/null
printf '\n\nNow, type the following to enter the chroot:\n\n'
printf "chroot '%s' /bin/ash -l\n\n" "${chroot_dir}"
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