#!/bin/sh

#

# Author: Laura Abbott <labbott@fedoraproject.org>

#

# Apply a stable patch update to the Fedora tree. This takes care of

# - Downloading the patch from kernel.org

# - Uploading the source file

# - Removing old patch files

# - Updating the spec file stable version

# - Adding a proper changelog entry

#

# Based on steps from https://fedoraproject.org/wiki/Kernel/DayToDay#Stable_kernel_update

#

# Args: Stable version to update (e.g. 4.7.7, 4.8.1)

if [ $# -lt 1 ]; then

	echo "Need a version"

	exit 1

fi

VERSION=`echo $1 | cut -d . -f 1`

if [ -z $VERSION ]; then

	echo "Malformed version $1"

	exit 1

fi

PATCHLEVEL=`echo $1 | cut -d . -f 2`

if [ -z $VERSION ]; then

	echo "Malformed version $1"

	exit 1

fi

SUBLEVEL=`echo $1 | cut -d . -f 3`

if [ -z $VERSION ]; then

	echo "Malformed version $1"

	exit 1

fi

if [ ! -f patch-$1.xz ]; then

	wget https://cdn.kernel.org/pub/linux/kernel/v5.x/patch-$1.xz

	if [ ! $? -eq 0 ]; then

		echo "Download fail"

		exit 1

	fi

fi

# This all needs to be updated for the new generation system

#

# if [ ! -f "patch-$1.sign" ]; then

#        wget "https://cdn.kernel.org/pub/linux/kernel/v4.x/patch-$1.sign"

#        if [ ! $? -eq 0 ]; then

#                echo "Signature download failed"

#                exit 1

#        fi

# fi

# xzcat "patch-$1.xz" | gpg2 --verify "patch-$1.sign" -

# if [ ! $? -eq 0 ]; then

#        echo "Patch file has invalid or untrusted signature!"

#        echo "See https://www.kernel.org/category/signatures.html"

#        exit 1

# fi

grep $1 sources &> /dev/null

if [ ! $? -eq 0 ]; then

	fedpkg upload patch-$1.xz

	# Cryptic awk: search for the previous patch level (if one exists) and

	# remove it from the source file

	awk -v VER=$VERSION.$PATCHLEVEL.$((SUBLEVEL-1)) '$0 !~ VER { print $0; }' < sources > sources.tmp

	mv sources.tmp sources

fi

# Update the stable level

awk -v STABLE=$SUBLEVEL '/%define stable_update/ \

			{ print "%define stable_update " STABLE } \

			!/%define stable_update/ { print $0 }' \

			< kernel.spec > kernel.spec.tmp

mv kernel.spec.tmp kernel.spec

# Reset the base release for use with rpmdev-bumpspec

BASERELEASE=`cat kernel.spec | grep "%global baserelease" | cut -d ' ' -f 3 | head -c 1`00

BASERELEASE=$(($BASERELEASE-1))

BASERELEASE=$BASERELEASE perl -p -i -e 's|%global baserelease.*|%global baserelease $ENV{'BASERELEASE'}|' kernel.spec

rpmdev-bumpspec -c "Linux v$1" kernel.spec