#!/bin/bash

# Script to merge all configs and run 'make silentoldconfig' on it to wade out bad juju.
# Then split the configs into distro-commmon and flavour-specific parts
#
# See this page for more details:
# http://dev.chromium.org/chromium-os/how-tos-and-troubleshooting/kernel-configuration

# We have to be in the top level kernel source directory
if [ ! -f MAINTAINERS ] || [ ! -f Makefile ]; then
    echo "This does not appear to be the kernel source directory." 1>&2
    exit 1
fi

mode=${1:?"Usage: $0 [oldconfig|editconfig]"}
case "$mode" in
    oldconfig)  ;; # All is good
    editconfig) ;; # All is good
    genconfig)  ;; # All is good
    *) echo "$0 called with invalid mode" 1>&2
       exit 1 ;;
esac
kerneldir="`pwd`"
confdir="$kerneldir/debian/config"
archs="armhf arm64"
bindir="`pwd`/debian/scripts"
tmpdir=`mktemp -d`

if [ "$mode" = "genconfig" ]; then
    keep=1
    mode="oldconfig"
    test -d CONFIGS || mkdir CONFIGS
fi

test -d build || mkdir build

for arch in $archs; do
    # Map debian archs to kernel archs
    case "$arch" in
        amd64)  kernarch="x86_64"   ;;
        lpia)   kernarch="x86"  ;;
        sparc)  kernarch="sparc64"  ;;
        armel)  kernarch="arm"  ;;
        armhf)  kernarch="arm"  ;;
        *)      kernarch="$arch"    ;;
    esac

    echo ""
    echo "***************************************"
    echo "* Processing $arch ($kernarch) ... "
    archconfdir=$confdir/$arch
    flavourconfigs=$(cd $archconfdir && ls config*)

    for config in $flavourconfigs; do
        fullconf="$tmpdir/$arch-$config-full"
        cat $confdir/config > "$fullconf"
        cat $archconfdir/$config >> "$fullconf"
    done

    echo archconfdir=$archconfdir
    echo flavourconfigs=$flavourconfigs
    echo fullconf=$fullconf


    for config in $flavourconfigs; do
        fullconf="$tmpdir/$arch-$config-full"
        mv "$fullconf" build/.config
        # Call oldconfig or menuconfig
        case "$mode" in
            oldconfig)
                # Weed out incorrect config parameters
                echo "* Run silentoldconfig on $arch/$config ..."
                make O=`pwd`/build ARCH=$kernarch silentoldconfig ;;
            editconfig)
                # Interactively edit config parameters
                echo "* $arch/$config: press <Enter> to edit, S to skip"
                read -s -n 1
                if [ $REPLY = 's' -o $REPLY = 'S' ]; then
                    echo "* Skip: running silentoldconfig"
                    make O=`pwd`/build ARCH=$kernarch silentoldconfig
                else
                    echo "* Running menuconfig"
                    make O=`pwd`/build ARCH=$kernarch menuconfig
                fi ;;
            *)  # Bad!
                exit 1 ;;
        esac
        cat build/.config > $archconfdir/$config
        if [ "$keep" = "1" ]; then
            make O=`pwd`/build ARCH=$kernarch oldconfig
            make O=`pwd`/build ARCH=$kernarch savedefconfig
            mv build/.config CONFIGS/$arch-$config
            mv build/defconfig CONFIGS/$arch-$config.def
        fi
    done
done

echo "Running splitconfig for $arch"
echo

# Can we make this more robust by avoiding $tmpdir completely?
# This approach was used for now because I didn't want to change
# splitconfig
echo archconfdir=$archconfdir, config=$config
(cd $confdir; $bindir/splitconfig)

rm -rf $tmpdir