toradex-kernel-config: add bbclass

It contains a helper function kernel_configure_variable that could be
called in do_configure_append task to assign a value to a config
variable in ${B}/.config.

Change toradex-kernel-localversion.bbclass to use this function.

Signed-off-by: Ming Liu <ming.liu@toradex.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/classes/toradex-kernel-config.bbclass b/classes/toradex-kernel-config.bbclass
new file mode 100644
index 0000000..8c3ad71
--- /dev/null
+++ b/classes/toradex-kernel-config.bbclass
@@ -0,0 +1,17 @@
+# Assign a config variable in ${B}/.config.
+# Should be called in do_configure_append only.
+#
+# $1 - config variable to be set
+# $2 - value [n/y/value]
+#
+kernel_configure_variable() {
+	# Remove the original config, to avoid reassigning it.
+	sed -i -e "/CONFIG_$1[ =]/d" ${B}/.config
+
+	# Assign the config value
+	if [ "$2" = "n" ]; then
+		echo "# CONFIG_$1 is not set" >> ${B}/.config
+	else
+		echo "CONFIG_$1=$2" >> ${B}/.config
+	fi
+}