#!/bin/bash
#
# Copyright 2005 Greg Kroah-Hartman <gregkh@suse.de>
#
# Released under the GPL v2 only.
#
# Horrible hack of a script to let kernel maintainers, who use quilt
# export a series of patches in a form that is rolled up, and in-order
# for others to pick up and use.  Examples of this is for the -mm releases.
#

# Here are the things you should modify:

# AUTHOR is your name, it will be pre-appended to all patches
AUTHOR=gregkh

# KERNEL is the base kernel version your quilt series is against.  You need to
# have this kernel tree already uncompressed and waiting in the TMP directory
KERNEL=2.6.15-rc1-git5

# TMP is where you want everything to happen.  You need to have a base kernel
# version (specified by KERNEL) in here, all unpacked.  This is also where the
# end result files will be placed.
TMP=~/linux/tmp

# PATCH_DIR is the location of your quilt patches.  There should be a file in
# here called "series" and a bunch of patches in subdirectories below that (the
# subdirs are how you divide stuff up by TREES)
PATCH_DIR=~/linux/patches

# TREES is a list of the different sets of kernel patches you wish to produce.
# If you only have one set of patches, this can be a single value.  The strings
# here need to have a subdirectory in the PATCH_DIR to get the patches from.
TREES="driver i2c pci usb devfs"


# Don't touch anything below here, unless you really want to...

do_it() {
	NEW=$BASE-$TREE
	CLEAN_TREE="$BASE$OLD_TREE"
	BASENAME=`echo "$AUTHOR" "$SERIES" "$TREE" | \
		awk '{ printf("%s-%02d-%s\n", $1, $2, $3, $4);}'`
	TMPDIR=$TMP/$BASENAME

	echo "Building series file for $TREE"
	chmod 644 $PATCH_DIR/$TREE/*.patch
	mkdir $TMPDIR
	echo "Use the 'series' file in this directory to determine the order in" > $TMPDIR/README
	echo "which to apply the patches." >> $TMPDIR/README
	echo "" >> $TMPDIR/README
	echo "These patches are based on the $KERNEL version of the kernel." >> $TMPDIR/README
	echo "Applying them to any other kernel version might not work at all." >> $TMPDIR/README
	touch $TMPDIR/series
	count=1
	for x in `grep "^$TREE\/" $PATCH_DIR/series`
	do
		file=`basename $x`
		#name=`echo "$AUTHOR" "$TREE" "$count" "$file" | \
		#	awk '{ printf("%s-%s-%03d_%s\n", $1, $2, $3, $4);}'`
		#cp $PATCH_DIR/$x $TMPDIR/$name
		cp -a $PATCH_DIR/$x $TMPDIR/$file
		#echo "$name" >> $TMPDIR/series
		echo "$file" >> $TMPDIR/series
		let count++
	done

	echo "Creating $NEW kernel tree"
	cp -alp $CLEAN_TREE $NEW

	# apply quilt series
	cd $NEW
	QUILT_PATCHES=$TMPDIR QUILT_SERIES=$TMPDIR/series quilt push -aq --quiltrc
	#rm $TMPDIR/series
	cd ..

	# TODO put "changelog" in patch.
	echo "diffing $CLEAN_TREE and $NEW"
	diff -Naur -X ../dontdiff $CLEAN_TREE $NEW > $BASENAME-$KERNEL.patch

	echo "cleaning up quilt remnants $NEW"
	rm -rf $NEW/.pc

	echo "Patch is at $BASENAME-$KERNEL.patch"
	echo "Dir of patches is at $TMPDIR"
	echo ""
	let SERIES++
}

BASE=linux-$KERNEL
# make sure we have a base tree to diff off of.
if [ ! -d "$TMP/$BASE" ] ; then
	echo "I need $TMP/$BASE present in order to work properly."
	exit 1
fi

# make sure everything is readable by world for when we upload the patches
find $PATCH_DIR -type f | xargs chmod 644

# initialize some variables
SERIES=1
OLD_TREE=""

# do the work
cd $TMP

for TREE in $TREES
do
	do_it
	if [ "X$OLD_TREE" != "X" ] ; then
		echo "Cleaning up $BASE$OLD_TREE"
		rm -rf $BASE$OLD_TREE
	fi
	OLD_TREE="-$TREE"
done

# TODO put "changelog" in patch.

echo ""
echo "diffing $BASE and $NEW"
diff -Naur -X ../dontdiff $BASE $NEW > $AUTHOR-all-$KERNEL.patch
echo "Patch is at $AUTHOR-all-$KERNEL.patch"


if [ "X$OLD_TREE" != "X" ] ; then
	echo "Cleaning up $BASE$OLD_TREE"
	rm -rf $BASE$OLD_TREE
fi