tools: Add configuration generator

Adding a helper script to generate a configuration for the root cell.
The script can also generate another script to collect all the necessary
files on a remote machine.
Both scripts can be accessed through the jailhouse command.

Signed-off-by: Henning Schild <henning.schild@siemens.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

.gitignore

@@ -11,4 +11,5 @@ jailhouse.ko
 hypervisor/include/jailhouse/config.h
 hypervisor/hypervisor.lds
 tools/jailhouse
+tools/jailhouse-config-collect
 configs/*.cell

tools/Makefile

@@ -15,8 +15,34 @@ CC = $(CROSS_COMPILE)gcc
 CFLAGS = -g -O3 -I.. -I../hypervisor/include \
 	-Wall -Wmissing-declarations -Wmissing-prototypes
 
+TARGETS := jailhouse
+
+HAS_PYTHON_MAKO := \
+	$(shell python -c "from mako.template import Template" 2>/dev/null \
+	&& echo yes)
+
+ifeq ($(strip $(HAS_PYTHON_MAKO)), yes)
+	TARGETS += jailhouse-config-collect
+else
+	TARGETS += no_python_mako
+endif
+
+all: $(TARGETS)
+
 jailhouse: jailhouse.c ../jailhouse.h ../hypervisor/include/jailhouse/cell-config.h
 	$(CC) $(CFLAGS) -o $@ $<
 
+jailhouse-config-collect: jailhouse-config-create jailhouse-config-collect.tmpl
+	./$< -g $@
+	chmod +x $@
+
+.PHONY: clean no_python_mako
+
 clean:
-	rm -f jailhouse
+	rm -f $(TARGETS)
+
+no_python_mako:
+	@echo -ne "WARNING: Could not create the helper script to generate" \
+		  "configurations on remote machines" \
+		  "(\"jailhouse-conf-collect\"). You need Python and the" \
+		  "Mako library for it.\n"

tools/jailhouse-config-collect.tmpl

@@ -0,0 +1,59 @@
+#!/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