#!/bin/sh

if [ "$EUID" -ne 0 ]; then
    echo "Must be ran as root"
    exit
fi

# Make sure the partition is mounted according to fstab
mount /mnt/arch 2> /dev/null

# Mount necessary directories for chroot to be possible
mount --types proc /proc /mnt/arch/proc
mount --rbind /sys /mnt/arch/sys
mount --make-rslave /mnt/arch/sys
mount --rbind /dev /mnt/arch/dev
mount --make-rslave /mnt/arch/dev

# Chroot with zsh shell
chroot /mnt/arch /bin/zsh --login

# Unmount recursively mounted directories
umount -l /mnt/arch/dev{/shm,/pts,}
umount -R /mnt/arch

# Remount partition accordingly to fstab
# (the above umountings will unmount gentoo completely,
# which means that remounting is necessary)
mount /mnt/arch