Generate wpa_supplicant.conf on the fly from the template

Change-Id: I28e12b22c4ca5a37dfdb8ca4cd0c522aaafa8f0a
http://b/issue?id=1800203

wpa_supplicant_conf.mk

@@ -0,0 +1,38 @@
+#
+# Copyright (C) 2010 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# Include this makefile to generate your hardware specific wpa_supplicant.conf
+# Requires: WIFI_DRIVER_SOCKET_IFACE
+
+WPA_SUPPLICANT_STORED_LOCAL_PATH := $(LOCAL_PATH)
+LOCAL_PATH := $(call my-dir)
+
+########################
+
+WPA_SUPPLICANT_CONF_GENERATED := $(call intermediates-dir-for,ETC,wpa_supplicant.conf)/wpa_supplicant.conf
+WPA_SUPPLICANT_CONF_TEMPLATE := $(LOCAL_PATH)/wpa_supplicant.conf
+WPA_SUPPLICANT_CONF_SCRIPT := $(LOCAL_PATH)/wpa_supplicant_conf.sh
+$(WPA_SUPPLICANT_CONF_GENERATED): $(WPA_SUPPLICANT_CONF_TEMPLATE) $(WPA_SUPPLICANT_CONF_SCRIPT)
+	@echo Target wpa_supplicant.conf: $@
+	@mkdir -p $(dir $@)
+	$(hide) WIFI_DRIVER_SOCKET_IFACE="$(WIFI_DRIVER_SOCKET_IFACE)" \
+		bash $(WPA_SUPPLICANT_CONF_SCRIPT) $(WPA_SUPPLICANT_CONF_TEMPLATE) > $@
+
+PRODUCT_COPY_FILES += $(WPA_SUPPLICANT_CONF_GENERATED):system/etc/wifi/wpa_supplicant.conf
+
+########################
+
+LOCAL_PATH := $(WPA_SUPPLICANT_STORED_LOCAL_PATH)

wpa_supplicant_conf.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+#
+# Copyright (C) 2010 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# Generate a wpa_supplicant.conf from the template.
+# $1: the template file name
+if [ -n "$WIFI_DRIVER_SOCKET_IFACE" ]
+then
+  sed -e 's/#.*$//' -e 's/[ \t]*$//' -e '/^$/d' < $1 | sed -e "s/wlan0/$WIFI_DRIVER_SOCKET_IFACE/"
+else
+  sed -e 's/#.*$//' -e 's/[ \t]*$//' -e '/^$/d' < $1
+fi