#!/bin/sh
#
# Jailhouse, a Linux-based partitioning hypervisor
#
# Copyright (c) Siemens AG, 2014
#
# This work is licensed under the terms of the GNU GPL, version 2.  See
# the COPYING file in the top-level directory.
#
# This script will collect information needed to generate a Jailhouse
# configuration for hypervisor and root cell (Linux).
#
# Run it like that:
#  $ jailhouse-config-collect.sh mytarget.tar
#
# Copying files and directories from /sys and /proc is surprisingly hard
# it would be nice to use just one tool together with the list of files.
# The main problem is that stat does not report the correct file sizes. In
# procfs files seem to have a size of 0 while in sysfs they ofter appear
# bigger than they really are.
# Archivers like tar/cpio etc. can not be used for procfs and sysfs.
# This scripts first gets a temporary copy of all the files we want. After
# copying the files can be archived with tar.

set -e

if test -z "$1"; then
	echo "Usage: $0 mytarget.tar" 1>&2
	exit 1
fi

filelist="${filelist}"

tmpdir=/tmp/jailhouse-config-collect.$$

rm -rf $tmpdir
mkdir $tmpdir

# copy all the files we need to a temporary directory first
for f in $filelist
do
	if [ -f $f ]
	then
		dstdir=$tmpdir/$(dirname $f)
		if [ ! -d $dstdir ]
		then
			mkdir -p $dstdir
		fi
		cp -p $f $tmpdir/$f
	else
		echo "Warning: $f does not exist" 1>&2
	fi
done

# now archive it and remove temporary copy
tar -C $tmpdir -cf $1 .
rm -rf $tmpdir

exit 0