RocketLinux/graveyard/first_attempt/tools/chroot

#!/bin/sh
umask 022
set -e

if [ "$(id -u)" != "0" ]; then
    echo "Please run this script as root" 1>&2
    exit 1
fi

if [ ! "$rocket" ]; then
    echo 'Please set the $rocket variable' 1>&2
    exit 1
fi

rocket="$(realpath "$rocket")"

mkdir -p "$rocket/dev" "$rocket/proc" "$rocket/sys" "$rocket/run"
mount --bind /dev "$rocket/dev" 2> /dev/null || true
mount --bind /dev/pts "$rocket/dev/pts" 2> /dev/null || true  # Bind-mounting this because not doing so breaks some things.
mount -t proc proc "$rocket/proc" 2> /dev/null || true
mount -t tmpfs tmpfs "$rocket/run" 2> /dev/null || true
if [ -h "$rocket/dev/shm" ]; then
    mkdir -p "$rocket/$(readlink "$rocket/dev/shm")"
fi

mkdir -p "$rocket/etc"
cp /etc/resolv.conf "$rocket/etc/resolv.conf"

# FORCE_UNSAFE_CONFIGURE is needed for building some packages as root
chroot "$rocket" /tools/bin/env -i \
    HOME=/root \
    TERM="$TERM" \
    PS1="(buildenv) \u:\w \$ " \
    PATH=/bin:/sbin:/usr/bin:/usr/sbin:/tools/bin:/tools/sbin \
    MAKEFLAGS="$MAKEFLAGS" \
    FORCE_UNSAFE_CONFIGURE=1 \
    /tools/bin/ash -l

umount "$rocket/dev/pts" || true
umount "$rocket/dev" || true
umount "$rocket/proc" || true
umount "$rocket/run" || true