devtool-olddefconfig.sh

#!/bin/bash

set -e

if [ "$#" -lt 1 ] || [ "$#" -gt 2 ]; then
    echo "USAGE: $0 kernel-recipe [defconfig path]"
    exit 1
fi

recipe=$1
dest=$(realpath $2)

bbgetvar () {
    # NOTE: You may need to add SANITY_TESTED_DISTROS:append = " debian-12"
    # to conf/local.conf if the error messages makes it into the output
    bitbake-getvar -r "$1" --value "$2"
}

bitbake -c do_configure $recipe
KCONFIG="$(bbgetvar $recipe B)/.config"

if [ -z "$dest" ]; then
    echo "$KCONFIG"
else
    cd "$(dirname $dest)"
    dest=$(basename $dest)
    if [ -n "$(git status --porcelain $dest)" ]; then
	echo "uncomitted changes: refusing to overwrite $dest"
	exit 2
    fi

    cp "$KCONFIG" "$dest"
fi