From 0c0df75d690c3f287b92186fcbd2ccb7a714adf9 Mon Sep 17 00:00:00 2001
From: Michael Marineau <michael.marineau@coreos.com>
Date: Sun, 17 Nov 2013 22:45:34 -0800
Subject: [PATCH] fix(cros-kernel2.eclass): Disable OUTOFTREE_BUILD when src is
 dirty.

If OUTOFTREE_BUILD=1 (currently disabled but that will change) the
kernel will use the existing checkout as the source tree rather than
cloning another tree. If someone built anything in that tree and .config
exists the build will fail complaining that the source isn't clean.
Instead of failing just disable OUTOFTREE and emit a warning.

OUTOFTREE combined with INCREMENTAL makes successive kernel builds
pretty much no-ops (just re-linking modules and bzImage).
---
 .../third_party/coreos-overlay/eclass/cros-kernel2.eclass | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sdk_container/src/third_party/coreos-overlay/eclass/cros-kernel2.eclass b/sdk_container/src/third_party/coreos-overlay/eclass/cros-kernel2.eclass
index 9e66216f24..ea2322db51 100644
--- a/sdk_container/src/third_party/coreos-overlay/eclass/cros-kernel2.eclass
+++ b/sdk_container/src/third_party/coreos-overlay/eclass/cros-kernel2.eclass
@@ -129,6 +129,14 @@ kmake() {
 }
 
 cros-kernel2_src_unpack() {
+	local srclocal="${CROS_WORKON_LOCALDIR[0]}/${CROS_WORKON_LOCALNAME[0]}"
+	local srcpath="${CROS_WORKON_SRCROOT}/${srclocal}"
+	if [[ -f "${srcpath}/.config" || -d "${srcpath}/include/config" ]]; then
+		ewarn "Local kernel source is not clean, disabling OUTOFTREE_BUILD"
+		elog "Please run 'make mrproper' in ${srclocal}"
+		CROS_WORKON_OUTOFTREE_BUILD=0
+	fi
+
 	cros-workon_src_unpack
 
 	local config="$(find_defconfig)"