_shared_prologue

#! /bin/bash

_rootdir=${_rootdir:-"$(dirname "$(readlink -f "$0")")"}

if [[ -z "$_rootdir" ]]; then
    echo "Cannot derive root directory of the script $0" >&2
    exit 1
fi

export LKHH_DIR=${LKHH_DIR:-$(dirname "$_rootdir")}
export LKHH_BIN=${LKHH_BIN:-$_rootdir}
export LKHH_ARENA=${LKHH_ARENA:-"$LKHH_DIR/arena"}
export LKHH_IMAGE=${LKHH_IMAGE:-"$LKHH_DIR/image"}

#
# Heuristics for identifying the kernel source rootdir to build.
#
function _lkhh_test_pwd_for_kernel_rootdir {
    [[ -f Kbuild ]] && [[ -f Kconfig ]] && [[ -f Makefile ]]
}

if _lkhh_test_pwd_for_kernel_rootdir; then
    export LKHH_LINUX=${LKHH_LINUX:-"$(readlink -f "$PWD")"}
else
    export LKHH_LINUX=${LKHH_LINUX:-"$HOME/project/linux"}
fi

#
# Check validity of $LKHH_LINUX as a kernel source rootdir.
#

if ! pushd "$LKHH_LINUX" &>/dev/null; then
    >/dev/stderr echo "Can not change into \"$LKHH_LINUX\"."
    exit 1
elif ! _lkhh_test_pwd_for_kernel_rootdir; then
    >/dev/stderr echo "$LKHH_LINUX is not a Linux kernel source rootdir."
    popd &>/dev/null
    exit 1
fi
popd &>/dev/null

unset -f _lkhh_test_pwd_for_kernel_rootdir

#
# https://bugzilla.redhat.com/show_bug.cgi?id=1528020
# Kernel building does not like a custom CPATH.
#
unset CPATH

_progname=${_progname:-"$(basename $0)"}
_ver=${_ver:-"0.0.1-dev"}
_author=${_author:-"Wei Peng <me@1pengw.com>"}

_verbose=0

source "$_rootdir/_shared_lib"