Add build/ subfolder to help build overlays out of AOSP

build/build.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+set -e
+
+if ! which aapt > /dev/null;then
+    echo "Please install aapt (apt install aapt should do)"
+    exit 1
+fi
+
+cd "$(dirname "$(readlink -f -- $0)")"
+
+find .. -name Android.mk |while read f;do
+    name="$(sed -nE 's/LOCAL_PACKAGE_NAME.*:\=\s*(.*)/\1/p' "$f")"
+    grep -q treble-overlay <<<$name || continue
+    echo "Generating $name"
+
+    path="$(dirname "$f")"
+    aapt package -f -F ${name}-unsigned.apk -M $path/AndroidManifest.xml -S $path/res -I /build/apps/platforms/android-27/android.jar
+    LD_LIBRARY_PATH=./signapk/ java -jar signapk/signapk.jar keys/platform.x509.pem keys/platform.pk8 ${name}-unsigned.apk ${name}.apk
+    rm -f ${name}-unsigned.apk
+done

build/keys/platform.x509.pem

@@ -0,0 +1,27 @@
+-----BEGIN CERTIFICATE-----
+MIIEqDCCA5CgAwIBAgIJALOZgIbQVs/6MA0GCSqGSIb3DQEBBAUAMIGUMQswCQYD
+VQQGEwJVUzETMBEGA1UECBMKQ2FsaWZvcm5pYTEWMBQGA1UEBxMNTW91bnRhaW4g
+VmlldzEQMA4GA1UEChMHQW5kcm9pZDEQMA4GA1UECxMHQW5kcm9pZDEQMA4GA1UE
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+tCsgSL+ItdFJKe+F9g7dEtctVWV+IuPoXQTIMdYT0Zk4u4mCJH+jISVroS0dao+S
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+IC7alMarjdW4OZID2q4u1EYjLk/pvZYTlMYwDlE448/Shebk5INTjLixs1c=
+-----END CERTIFICATE-----