ptrcports/root-enter/enter

#!/bin/sh

set -e

[ "$(id -u)" = 0 ] || DOAS="${DOAS:-doas}"
[ "$unshared" = 1 ] || exec $DOAS env unshared=1 unshare -m $0 "$@"

bindpoints="/etc/resolv.conf"
user="patrycja"
command="ash -l"

while getopts "be:u:c:" opt; do
	case $opt in
		'b') bindpoints="
			$bindpoints
			/home/patrycja/aports
			/home/patrycja/packages
			/home/patrycja/.abuild
		" ;;
		'e') bindpoints="$bindpoints $OPTARG" ;;
		'u') user=$OPTARG ;;
		'c') command=$OPTARG ;;
		*) echo "unknown $opt" ;;
	esac
done
shift $(( $OPTIND - 1 ))

if [ ! -d "$1" ]; then
	echo "no such directory: $1"
	exit 1
fi

mount -t devtmpfs devtmpfs $1/dev
mount -t tmpfs shm $1/dev/shm
mount -t devpts devpts $1/dev/pts
mount -t sysfs sysfs $1/sys
mount -t proc proc $1/proc
mount -t tmpfs tmpfs $1/tmp
for point in $bindpoints; do
  if [ -f $point ]; then
    touch $1$point
  else
    mkdir -p $1$point
  fi
	mount --bind $point $1$point
done

chroot $1 /bin/sh -c "su $user -c '$command'"