#!/bin/bash -e

sn="${0##*/}"
export ARCH="x86_64"
mkopt="-j$(nproc)" || mkopt=''

if [ ! -d "$LINUX_GIT" ]; then
    echo "${sn}: please set LINUX_GIT to the location of kernel git" >&2
    exit 1
fi

pushd "$LINUX_GIT"
if [ -n "$1" ]; then
    git checkout "$1"
fi
desc=$(git describe --exact-match 2>/dev/null \
       || git show -s --abbrev=12 --pretty='commit %h')
kobj=$(mktemp -d)
make $mkopt O="$kobj" allmodconfig
make $mkopt O="$kobj" prepare
make $mkopt O="$kobj" INSTALL_HDR_PATH="${kobj}/hdr" headers_install
popd

pushd uapi
find . -type f -name '*.h' -exec cp -v "${kobj}/hdr/include/{}" {} \;
popd
rm -rf "$kobj"

git add uapi
git commit -s -F - <<EOT
update UAPI header copies

Update to kernel ${desc}.

EOT