#!/bin/bash

CONTEXT="$1";     shift
RUBYVERSION="$1"; shift

if [ "$CONTEXT" = "" ]; then
	echo "    Internal error: /opt context is not set" >&2
	exit 4
fi

if [ "$RUBYVERSION" = "" ]; then
	echo "    Internal error: Ruby version is not set" >&2
	exit 4
fi

SYS_MNT_NS="$(sudo readlink /proc/1/ns/mnt)"
MY_MNT_NS="$(readlink /proc/self/ns/mnt)"

if [ "$SYS_MNT_NS" = "$MY_MNT_NS" ]; then
	echo "    Internal error: Wrong MNT namespace" >&2
	exit 4
fi

mount --bind /srv/share/nfs/opt/"$CONTEXT" /opt
source /usr/local/share/chruby/chruby.sh
chruby "$RUBYVERSION" &&
runuser -u nobody -g "$CONTEXT" $@
RC="$?"
umount -l /opt

exit $RC