added stuff for updating the kernel source

Author: ylixir

builder.sh

@@ -83,6 +83,10 @@ case "$1" in
         echo "Cloning the kernel's source"
         kernel_get
         ;;
+      update)
+        echo "Pulling updated kernel sources"
+        kernel_pull
+        ;;
       build)
         echo "Building the kernel"
         kernel_build

functions

@@ -147,6 +147,10 @@ kernel_get ()
 {
   git clone $KERNEL_REPO $BASE_DIR/$KERNEL_DIR;
 }
+kernel_pull ()
+{
+  git -C $BASE_DIR/$KERNEL_DIR pull;
+}
 #see https://wiki.ubuntu.com/Nexus7/Kernel for more information
 kernel_build ()
 {