#!/bin/sh -e

##########################################################################
#   Script description:
#       Unpack a tarball of a chroot image and configure it for pbulk
#
#   Arguments:
#       tarball
#       New directory to unpack in
#
#   History:
#   Date        Name        Modification
#   2017-12-24  root        Begin
##########################################################################

usage()
{
    printf "Usage: $0 chroot-tarball chroot-dir\n"
    exit 1
}


##########################################################################
#   Main
##########################################################################

if [ $# != 2 ]; then
    usage
fi

tarball=$1
dir=$2

if [ -e $dir ]; then
    printf "$dir already exists.  Aborting...\n"
    exit 1
fi

# Unpack tarball into dir
umask 022   # Everything must be accessible to pbulk user/group
mkdir $dir
cd $dir
tar zxvf ../$tarball
chmod 1777 tmp var/tmp
cd ..

# Clean /dev and /proc for null mount
# Dangerous: Can wipe host dirs while null-mounted
if mount | fgrep $dir; then
    cat << EOM

It appears that some directories in your chroot are currently null-mounted.
Removing $dir/kern/* while /kern is null-mounted could
damage your host system.  Aborting...

EOM
    exit 1
fi
rm -rf $dir/dev/* $dir/proc/*

# Update OS inside chroot
if [ `uname` = Linux ] && [ -e $dir/etc/redhat-release ]; then
    pbulk-start-chroot $dir 'yum update -y'
    pbulk-start-chroot $dir 'yum install -y cvs gcc gcc-c++ gcc-gfortran java-1.8.0-openjdk-headless'
elif [ `uname` = NetBSD ]; then
    # Clear /kern for null mount
    # Dangerous: Can wipe host dirs while null-mounted
    if mount | fgrep $dir; then
	cat << EOM

It appears that some directories in your chroot are currently null-mounted.
Removing $dir/kern/* while /kern is null-mounted could
damage your host system.  Aborting...

EOM
	exit 1
    fi
    rm -rf $dir/kern/*
    set -x
    pbulk-start-chroot $dir 'pkgin -y update' || true
    pbulk-start-chroot $dir 'pkgin -y upgrade' || true
    pbulk-start-chroot $dir 'pkgin -y install fetch' || true
else
    printf "Only RHEL/CentOS and NetBSD are supported at this time.\n"
    exit 1
fi

# Built pbulk setup in chroot
cp `which pbulk-setup` $dir
pbulk-start-chroot $dir ./pbulk-setup