#!/bin/bash
# Add suse Kernel repo headers to a patch created using git-format-patch 
#
# Brandon Philips <bphilips@suse.de>

PATH=$(dirname $0):$PATH

if [ $# -lt 1 ]; then
	echo "usage: $0 <filename> <kernel clone> <repo url>"
	echo "Add relevant headers for patches pulled from git"
	echo ""
	echo "Adds a Git-commit: tag using the From header"
	echo ""
	echo "Adds a Patch-mainline: tag if <kernel path> is given"
	echo "	a useful tree name can be provided in <kernel name>"
	echo "	otherwise basename <kernel path> will be used"
	echo ""
	echo "example usage"
	echo "-------------"
	echo "$0 NULL-pointer-fix.patch"
	echo "$0 NULL-pointer-fix.patch ~/kernel/linux-2.6"
	echo "$0 NULL-pointer-fix.patch ~/kernel/linux-2.6 pci 2.6"

	exit 1
fi

FILE=$1
shift

if [ ! -f $FILE ]; then
	echo "No such file $1"
	exit 2
fi

# try the git cherry-pick -x marker first
commit=$(sed -n 's/^(cherry picked from commit \([0-9a-f]*\))/\1/p' "$FILE")
if test -z "$commit"; then
	commit=$(head -n1 $FILE | sed -n "s%From\s\([0-9a-f]*\)\s.*%\1%p")
else
	sed -i '/^(cherry picked from commit/d' "$FILE"
fi
if [ "z$commit" = "z" ]; then
	echo "$FILE doesn't look like a patch from git"
else
	patch-tag -A git-commit="$commit" $FILE
fi

if [ $# -eq 0 ]; then
	libdir=$(dirname "$(readlink -f "$0")")
	DIR=$("$libdir"/linux_git.sh) || exit 1
else
	DIR=$1
	shift
fi

commit=$(patch-tag -p git-commit $FILE | grep -i "git-commit:" | sed "s%.*:\s\(.*\)%\1%g")

if [ "z$commit" = "z" ]; then
	echo "No git-commit tag in $FILE"
	exit 3
fi

export GIT_DIR=$DIR

if [ ! -d $GIT_DIR ]; then
	echo "No such directory $GIT_DIR"
	echo 4
fi

mainline=$(git describe --contains --match 'v*' $commit 2> /dev/null)
if test -z "$mainline"; then
	mainline=$(git describe --contains  $commit 2> /dev/null)
fi
mainline=${mainline%%[~^]*}

if [ "z$mainline" = "z" ]; then
	if git show $commit > /dev/null 2> /dev/null; then
		patch-tag -A Patch-mainline="Queued in subsystem maintainer repository" "$FILE"
		if test -n "$1"; then
			patch-tag -A Git-repo="$*" "$FILE"
		else
			echo "warning: Non-mainline commit in $FILE but no repo url specified"
		fi
		exit 0
	else
		echo "$commit from $FILE does not exist in $DIR"
		exit 5
	fi
fi

patch-tag -A Patch-mainline="$mainline" $FILE