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#!/bin/sh
#
# Add unionfs support to a 2.6.x Linux kernel source.
# Adapted from script sent in by Sven Geggus
#
# This script expects a clean Linux source tree, and adds the following:
# linux/fs/unionfs Unionfs sources
# linux/fs/Kconfig A configuration option to
# "Miscellaneous filesytems" menu.
# linux/fs/Makefile A reference to linux/fs/unionfs.
#
# To control the Unionfs options (e.g., debugging), you still need to edit
# linux/fs/unionfs/Makefile, because they aren't yet configurable from
# make config.
#
if [ $# -ne 1 ]; then
echo "Usage: patch-kernel.sh <sourcetree>"
exit 1
fi
set -e
# kernel soucretree sanity check
if ! grep -q 'Linux kernel release 2.6.xx' $1/README; then
echo "Invalid Kernel Sourcetree $1, should be Kernel 2.6.x"
exit 1
fi
if [ -d $1/fs/unionfs ] ; then
echo "This kernel source tree is already patched."
exit 1
fi
# We don't want to double patch
if grep -q 'config UNION_FS' $1/fs/Kconfig 2>/dev/null ; then
echo "Configuration option 'UNION_FS' already exists in $1/fs/Kconfig" 1>&2
exit 1
fi
if grep -q 'CONFIG_UNION_FS' $1/fs/Makefile ; then
echo "Build option 'CONFIG_UNION_FS' already exists in $1/fs/Makefile" 1>&2
exit 1
fi
# We handle Kconfig first, because it is relatively tricky
if ! grep -q '^menu "Miscellaneous filesystems"' $1/fs/Kconfig 2>/dev/null ; then
echo "Can not find 'Miscellaneous filesystems' menu" 1>&2
exit 1
fi
START=`grep -n '^menu "Miscellaneous filesystems"' $1/fs/Kconfig |cut -d: -f1`
END=`tail -n +$START $1/fs/Kconfig |grep -n endmenu | head -n 1 | cut -d: -f1`
END=$(($START + $END - 2))
# add config-option to Kconfig
cp $1/fs/Kconfig $1/fs/Kconfig.orig
head -n $END $1/fs/Kconfig.orig >$1/fs/Kconfig
echo -e "config UNION_FS
\ttristate \"Union fs support\"
\tdepends on EXPERIMENTAL
\thelp
\t Unionfs is a stackable unification file system, which can
\t appear to merge the contents of several directories (branches),
\t while keeping their physical content separate.
\t see <http://www.fsl.cs.sunysb.edu/project-unionfs.html> for details
" >>$1/fs/Kconfig
tail -n +$(($END + 1)) $1/fs/Kconfig.orig >>$1/fs/Kconfig
# make the directory
mkdir -p $1/fs/unionfs
# copy unionfs sources
cp -a *.[ch] $1/fs/unionfs/
# copy unionfs extras over
cp -a AUTHORS COPYING ChangeLog INSTALL NEWS README $1/fs/unionfs
# copy makefile over
cp Makefile.kernel $1/fs/unionfs/Makefile
# add unionfs directory to Makefile in fs directory
cp $1/fs/Makefile $1/fs/Makefile.orig
echo 'obj-$(CONFIG_UNION_FS) += unionfs/' >>$1/fs/Makefile
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