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#!/bin/bash
# SPDX-License-Identifier: (GPL-2.0-only OR LGPL-2.1-only)
# SPDX-FileCopyrightText: 2015-2021 EfficiOS Inc.
set -e
usage() {
echo "usage: $0 <kernel source tree>" >&2
exit 1
}
[ "$#" -eq 1 ] || usage
KERNEL_DIR="$(readlink --canonicalize-existing "$1")"
# Symlink the lttng-modules directory in the kernel source
ln -sf "$(pwd)" "${KERNEL_DIR}/lttng"
# Graft ourself to the kernel build system
echo 'source "lttng/src/Kconfig"' >> "${KERNEL_DIR}/Kconfig"
# In kernel v6.1, subdirectories were moved to Kbuild
if grep -qE '^obj-y[[:space:]]+\+= kernel/' "${KERNEL_DIR}/Kbuild"; then
echo 'obj-y += lttng/' >> "${KERNEL_DIR}/Kbuild"
else
sed -i 's#+= kernel/#+= kernel/ lttng/#' "${KERNEL_DIR}/Makefile"
fi
echo >&2
echo " $0: done." >&2
echo " $0: now you can build the kernel with LTTng support." >&2
echo " $0: make sure you enable it (CONFIG_LTTNG) before building." >&2
echo >&2
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