From f6f9cdc99a57dc8b08a4c8f426d17c02d205878c Mon Sep 17 00:00:00 2001
From: Jeffrey Townsend <jeffrey.townsend@bigswitch.com>
Date: Sun, 1 Jan 2017 18:02:19 +0000
Subject: [PATCH] - Allow building individual source files - Allow direct
 specification of the kernel build tree.

---
 tools/scripts/kmodbuild.sh | 44 +++++++++++++++++++++++++++++++++-----
 1 file changed, 39 insertions(+), 5 deletions(-)

diff --git a/tools/scripts/kmodbuild.sh b/tools/scripts/kmodbuild.sh
index 36d801cd..0e5890ec 100755
--- a/tools/scripts/kmodbuild.sh
+++ b/tools/scripts/kmodbuild.sh
@@ -5,17 +5,51 @@ set -e
 # kmodbuild.sh kernel-packages module-directories platform-name
 #
 
-function build_module
+#
+# build <kernel-package> <module-directory> <platform-install-subdir>
+#
+function build
 {
-    KERNEL=`onlpm --find-dir $1 mbuilds`
-    BUILD_DIR=`mktemp -d`
-    cp -R $2/* "$BUILD_DIR"
+    if [ -d $1 ]; then
+        KERNEL=$1
+    else
+        KERNEL=`onlpm --find-dir $1 mbuilds`
+    fi
+    BUILD_DIR=$2
+    INSTALL_DIR=$3
     make -C $KERNEL M=$BUILD_DIR modules
     make -C $KERNEL M=$BUILD_DIR INSTALL_MOD_PATH=`pwd` INSTALL_MOD_DIR="$3" modules_install
 }
 
+#
+# build_directory <kernel-package> <module-directory> <install-subdir>
+#
+function build_directory
+{
+    BUILD_DIR=`mktemp -d`
+    cp -R $2/* "$BUILD_DIR"
+    build $1 $BUILD_DIR $3
+}
+
+#
+# build_source <kernel-package> <source-file> <install-subdir>
+#
+function build_source
+{
+    BUILD_DIR=`mktemp -d`
+    cp $2 $BUILD_DIR
+    src=$(basename $2)
+    obj=${src%.c}.o
+    echo "obj-m := $obj" >> $BUILD_DIR/Kbuild
+    build $1 $BUILD_DIR $3
+}
+
 for kernel in $1; do
     for module in $2; do
-        build_module $kernel $module $3
+        if [ -d $module ]; then
+            build_directory $kernel $module $3
+        else
+            build_source $kernel $module $3
+        fi
     done
 done