#!/bin/sh
# this script demonstrates how to build a testing environment
# for translucency with user-mode-linux (UML)

space=/tmp/space
mkdir -p $space ; cd $space

kver=2.4.22
# get current kernel from your local mirror
wget ftp://ftp.de.kernel.org/pub/linux/kernel/v2.4/linux-$kver.tar.bz2
# get current uml-patch
ver1=$kver-5
ver=${ver1}um
wget http://belnet.dl.sourceforge.net/sourceforge/user-mode-linux/uml-patch-$ver1.bz2
# get some root_fs
# root_fs_toms1.7.205.bz2 does have outdated modutils so
wget http://translucency.sourceforge.net/dl/root_fs.bz2
# or see http://translucency.sourceforge.net/doc/howto_build_uml_root_fs.txt
bzip2 -dk root_fs.bz2
mount -o loop root_fs /mnt

# now uncompress linux kernel and patch in UML
tar xjf linux-$kver.tar.bz2
cd linux
bzip2 -cd ../uml-patch-$ver1.bz2 | patch -p1
# enable COW device support (Block Devices menu)
# I compiled hostfs into the kernel (General Setup menu) - no more changes
make menuconfig dep ARCH=um
make linux modules ARCH=um
make modules_install INSTALL_MOD_PATH=/mnt/ ARCH=um
cp -a System.map /mnt/boot/System.map-$ver
cp -a linux /usr/bin
cd ..

# get latest translucency from sourceforge CVS (press Enter at password prompt)
cvs -d:pserver:anonymous@cvs.translucency.sourceforge.net:/cvsroot/translucency login
cvs -z3 -d:pserver:anonymous@cvs.translucency.sourceforge.net:/cvsroot/translucency co translucency
cd translucency
# or later just "cvs update" inside the translucency directory

# now compile translucency lkm with uml include dir
make clean all ARCH=um KERNELDIR_UM=$space/linux
# and install it - alternatively you may do later within uml "mount /host"
install -D -m 644 translucency.o /mnt/lib/modules/$ver/kernel/fs/

# create something of a testing hierarchy (included in my root_fs)
top=/mnt/tmp
if ! [ -e $top/2 ] ; then
  mkdir -p $top/2/4/8 $top/3/9/27 $top/2/6/12 $top/3/6/18
  echo 2 4 8 > $top/2/4/8/test
  echo 3 6 18 > $top/3/6/18/test
  echo 2 6 > $top/2/6/test
  echo 3 6 > $top/3/6/test
fi

umount /mnt

cd $space
# finally start your newly compiled uml kernel
# (cow means copy-on-write - if you damage something just do rm /tmp/cow )
linux ubd0=/tmp/cow,root_fs
# and enter something like
#insmod translucency
#echo "/tmp/2 -> /tmp/3" > /proc/sys/translucency/0
#cat /tmp/2/6/test

# be sure to use the same version of uml for linux "kernel" and modules