#!/bin/bash

set -e

cd $(dirname $0)/..

UPSTREAM_GIT="git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git"

BRANCHES="master filter-state upstream/master upstream/dts"

if [ ! -f scripts/filter.sh ] ; then
    echo "`pwd`: does not appear to be a device-tree.git" 1>&2
    exit 1
fi

if [ -z "$LATEST_VERSION" ] ; then
    FINGER_BANNER="https://www.kernel.org/finger_banner"
    LATEST_VERSION=$(wget --quiet -O - "$FINGER_BANNER" |\
        sed -n -e '0,/^The latest mainline version of the Linux kernel is:\s*\(.*\)$/s//\1/p')
fi

if [ -z "$LATEST_VERSION" ] ; then
    echo "Unable to determine latest version" 1>&2
    exit 1
fi

echo "Latest Version: v$LATEST_VERSION"
if ! git show-ref --quiet --verify refs/tags/v${LATEST_VERSION} ; then
    echo "Latest version is new"
fi
if ! git show-ref --quiet --verify refs/tags/v${LATEST_VERSION}-dts ; then
    echo "Latest version is unmerged"
fi
echo

echo "Current State:"
for branch in $BRANCHES ; do
    REF=$(git show-ref --verify refs/heads/${branch})
    if [ $? -ne 0 ] ; then
	echo "Tree is missing required branch ${branch}, aborting" 1>&2
	exit 1
    fi
    echo "  ${REF}"
done
echo

trap '
if [ -n "$FILTER_OUTPUT" ] ; then
    echo "---------------------------------------------------------------------"
    echo "Filter Output:"
    echo "---------------------------------------------------------------------"
    echo "$FILTER_OUTPUT"
    echo
fi
if [ -n "$MERGE_OUTPUT" ] ; then
    echo "---------------------------------------------------------------------"
    echo "Merge Output:"
    echo "---------------------------------------------------------------------"
    echo "$MERGE_OUTPUT"
    echo
fi
' EXIT

FILTER_OUTPUT=`(
set -e
echo "Switching to master branch"
git checkout master

echo "Fetching $UPSTREAM_GIT master"
git fetch --tags "$UPSTREAM_GIT" master
echo

echo "Filtering"
./scripts/filter.sh
echo
) 2>&1 `

#git push --dry-run origin filter-state upstream/dts upstream/master
#git push --dry-run origin --tags
#echo

DATE=$(date +%Y%m%d)
TESTBRANCH=test-${DATE}
MERGE_OUTPUT=`(
set -e
git checkout -b ${TESTBRANCH} origin/master
git merge --no-edit upstream/dts
) 2>&1 `
REF=$(git show-ref --verify refs/heads/${TESTBRANCH})
echo "Testing: ${REF}"
if git log ${TESTBRANCH} -- MAINTAINERS | grep --quiet . ; then
    echo "Filter branch has upstream-only content (MAINTAINERS file)"
    exit 1
fi

make clean -s
TEST_OUTPUT=`make -k -s 2>&1 || true`
if [ -z "${TEST_OUTPUT}" ]; then
    echo "Success!"
else
    echo "---------------------------------------------------------------------"
    echo "Test Output:"
    echo "---------------------------------------------------------------------"
    echo "$TEST_OUTPUT"
fi
echo

echo "Switching back to master branch"
git checkout master

echo "Recording refs/tests/${DATE}"
git update-ref refs/tests/${DATE} ${TESTBRANCH}

echo "Removing ${TESTBRANCH}"
git branch -D "${TESTBRANCH}"

echo "Final State:"
for branch in ${BRANCHES} ; do
    REF=$(git show-ref --verify refs/heads/${branch})
    echo "  ${REF}"
done
echo

exit 0