#!/bin/zsh
# chroot into an environment for gentoo package testing
# no argument: modify template
# first argument: suffix of the test subvolume

setopt LOCAL_OPTIONS ERR_RETURN NO_UNSET PIPE_FAIL

local chroot_dir="/mnt/testing"

if [[ "$(id -u)" != 0 ]]; then
    print -Pu2 "%B%F{red}you have to be root%f%b"
    return 1
fi

if [[ -v 1 ]]; then
    chroot_dir="${chroot_dir}_${1}"
    if [[ ! -d ${chroot_dir} ]]; then
        btrfs subvolume snapshot /mnt/testing "${chroot_dir}"
    fi
fi

cp --dereference /etc/resolv.conf ${chroot_dir}/etc/

mount --types proc /proc ${chroot_dir}/proc
mount --rbind /sys ${chroot_dir}/sys
mount --rbind /dev ${chroot_dir}/dev
mount --rbind /run ${chroot_dir}/run

mount -o bind,ro ~tea/src/gentoo ${chroot_dir}/var/db/repos/gentoo
mount -o bind,ro ~tea/src/guru ${chroot_dir}/var/db/repos/guru
mount -o bind,ro ~tea/src/tastytea-overlay ${chroot_dir}/var/db/repos/tastytea

chroot ${chroot_dir} /bin/bash -l

function _try_umount() {
    local dir=${1}

    setopt NO_ERR_RETURN
    umount --recursive ${dir} || umount --lazy ${dir}
    setopt ERR_RETURN
}

_try_umount ${chroot_dir}/var/db/repos/tastytea
_try_umount ${chroot_dir}/var/db/repos/guru
_try_umount ${chroot_dir}/var/db/repos/gentoo

_try_umount ${chroot_dir}/run
_try_umount ${chroot_dir}/dev
_try_umount ${chroot_dir}/sys
_try_umount ${chroot_dir}/proc

if [[ -v 1 ]]; then
    print -Pu2 "%F{blue}delete snapshot with%f" \
        "%F{magenta}btrfs subvolume delete ${chroot_dir}%f"
fi