#!/bin/sh
#
# NAME:
#         make-patches.sh - extract a set of linuxized patches from the
#                           ACPICA git repository
#
# SYNOPSIS:
#         make-patches.sh [-r release] <old_commit> [new_commit]
#
# DESCRIPTION:
#         Creates the linuxized patch set from old_commit to new_commit in
#         ACPICA git repository.
#         Parameters:
#          old_commit The old commit ID.
#          new_commit The new commit ID.  If this parameter is not specified,
#                     the new commit ID is default to HEAD.
#         Options:
#          -r release Specify a release ID, it will turn out to be the name of
#                     the patch files.  If this option is not specified, the
#                     default name of the patch files will be the current month
#                     in YYYYmm date format.
#

RELEASE=`date +%Y%m`

usage()
{
	echo "Usage: `basename $0` [-r release] <old_commit> [new_commit]"
	echo "Where:"
	echo "  -r: set release ID, default is $RELEASE in YYYYmm date format"
	echo "  old_commit: the old commit id\n";
	echo "  new_commit: optional, the new commit id, default to HEAD";
	exit 0
}

SCRIPT=`(cd \`dirname $0\`; pwd)`
source $SCRIPT/libacpica.sh

ACPICA_DIR=$CURDIR/patches.acpica.$RELEASE
LINUX_DIR=$CURDIR/patches.linux.$RELEASE
NEW_RELEASE="HEAD"
OLD_RELEASE="HEAD"
ACPICA_CNT=0
LINUX_CNT=0
MAINTAINER="Bob Moore <robert.moore@intel.com>"
GIT_EXTRACT="$SCRIPT/gen-patch.sh"

while getopts "dr:" opt
do
	case $opt in
	d) DRYRUN="yes";;
	r) RELEASE=$OPTARG;;
	?) echo "Invalid argument $opt"
	   usage;;
	esac
done
shift $(($OPTIND - 1))

if [ -z $1 ]; then
	echo "old_commit is not specified"
	usage
fi
OLD_RELEASE=$1
if [ ! -z $2 ]; then
	NEW_RELEASE=$2
fi

COMMITS=`git rev-list --reverse $OLD_RELEASE..$NEW_RELEASE`

for c in $COMMITS; do
	ACPICA_CNT=`expr $ACPICA_CNT + 1`
done

generate_patch()
{
	local cid aid lid
	local COMMIT SUBJECT

	cid=$1
	aid=$2
	lid=$3

	COMMIT=`git log -1 -c $cid --format=%H | cut -c 1-8`
	SUBJECT=`git log -1 -c $cid --format=%s`

	echo "[make-patches.sh] Generating patch ($aid:$lid:$COMMIT: $SUBJECT)..."
	(
		cd $SCRIPT

		if [ "x$DRYRUN" = "xyes" ]; then
			echo $GIT_EXTRACT -i $lid -s \'$MAINTAINER\' -f \'$MAINTAINER\' $COMMIT
		else
			eval $GIT_EXTRACT -i $lid -s \'$MAINTAINER\' -f \'$MAINTAINER\' $COMMIT
			echo "[make-patches.sh]  Copying ACPICA patch ($RELEASE-$aid.patch)..."
			mv acpica-$COMMIT.patch $ACPICA_DIR/$RELEASE-$aid.patch
			echo $RELEASE-$aid.patch >> $ACPICA_DIR/series
		fi


		if [ -f linux-$COMMIT.patch ]; then
			if [ "x$DRYRUN" != "xyes" ]; then
				echo "[make-patches.sh] Copying Linux patch ($RELEASE-$lid.patch)..."
				mv linux-$COMMIT.patch $LINUX_DIR/$RELEASE-$lid.patch
				echo $RELEASE-$lid.patch >> $LINUX_DIR/series
			fi
		fi
	)
}

rm -rf $ACPICA_DIR
rm -rf $LINUX_DIR
mkdir -p $ACPICA_DIR
mkdir -p $LINUX_DIR

ACPICA_IDX=1
LINUX_IDX=1
make_acpisrc $SRCDIR force > /dev/null

for c in $COMMITS; do
	generate_patch $c $ACPICA_IDX $LINUX_IDX

	LINUX_TO=$LINUX_DIR/$RELEASE-$LINUX_IDX.patch
	if [ -f $LINUX_TO ]; then
		echo "[make-patches.sh] Generated $LINUX_TO."
		LINUX_IDX=`expr $LINUX_IDX + 1`
	fi

	ACPICA_IDX=`expr $ACPICA_IDX + 1`
done

LINUX_CNT=`expr $LINUX_IDX - 1`

echo "[make-patches.sh] Generated $ACPICA_CNT raw patches and $LINUX_CNT linuxized patches."