extract_utils: Introduce variable INITIAL_COPYRIGHT_YEAR

Let a device specify INITIAL_COPYRIGHT_YEAR=XXXX in setup-makefiles.sh
so that the correct copyright(s) is/are included in vendor makefiles.
The CyanogenMod copyright is retained when INITIAL_COPYRIGHT_YEAR<2017
and the LineageOS copyright is now included for >=2017.

Change-Id: I6895b5b69bc7ba399042ac3c29e17f3209d15f1b

build/tools/extract_utils.sh

@@ -438,12 +438,35 @@ function write_product_packages() {
 # be executed first!
 #
 function write_header() {
+    if [ -f $1 ]; then
+        rm $1
+    fi
+
     YEAR=$(date +"%Y")
 
     [ "$COMMON" -eq 1 ] && local DEVICE="$DEVICE_COMMON"
 
-    cat << EOF > $1
-# Copyright (C) $YEAR The CyanogenMod Project
+    NUM_REGEX='^[0-9]+$'
+    if [[ $INITIAL_COPYRIGHT_YEAR =~ $NUM_REGEX ]] && [ $INITIAL_COPYRIGHT_YEAR -le $YEAR ]; then
+        if [ $INITIAL_COPYRIGHT_YEAR -lt 2016 ]; then
+            printf "# Copyright (C) $INITIAL_COPYRIGHT_YEAR-2016 The CyanogenMod Project\n" > $1
+        elif [ $INITIAL_COPYRIGHT_YEAR -eq 2016 ]; then
+            printf "# Copyright (C) 2016 The CyanogenMod Project\n" > $1
+        fi
+        if [ $YEAR -eq 2017 ]; then
+            printf "# Copyright (C) 2017 The LineageOS Project\n" >> $1
+        elif [ $INITIAL_COPYRIGHT_YEAR -eq $YEAR ]; then
+            printf "# Copyright (C) $YEAR The LineageOS Project\n" >> $1
+        elif [ $INITIAL_COPYRIGHT_YEAR -le 2017 ]; then
+            printf "# Copyright (C) 2017-$YEAR The LineageOS Project\n" >> $1
+        else
+            printf "# Copyright (C) $INITIAL_COPYRIGHT_YEAR-$YEAR The LineageOS Project\n" >> $1
+        fi
+    else
+        printf "# Copyright (C) $YEAR The LineageOS Project\n" > $1
+    fi
+
+    cat << EOF >> $1
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.