Implement sysprop_library API stability check
sysprop_library now checks the API stability itself, cutting dependency
on java_sdk_library. Under the directory {module_dir}/api,
{module_name}-current.txt and {module_name}-latest.txt hold API
signatures.
When sysprop_library is built, or a user run "m {module_name}-check-api"
command, API check is performed. First, current.txt must have exactly
same signature with built sysprop_library module. Second, current.txt
must be compatible with latest.txt.
Build system emits a handy error message to generate/update those API
files, in case of missing or mismatching. Also, a script file for
freezing API files is introduced.
Bug: 131637873
Test: 1) m && boot blueline
Test: 2) m {sysprop_library} performs API check
Test: 3) manual test for check-api, freezing api
Change-Id: I9d25f5dc64299e666527ca8e23d7233966901c4e
diff --git a/scripts/gen-sysprop-api-files.sh b/scripts/gen-sysprop-api-files.sh
new file mode 100755
index 0000000..a4cb506
--- /dev/null
+++ b/scripts/gen-sysprop-api-files.sh
@@ -0,0 +1,26 @@
+#!/bin/bash -e
+
+# Copyright (C) 2019 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.
+
+if [[ -z "$1" || -z "$2" ]]; then
+ echo "usage: $0 <modulePath> <moduleName>" >&2
+ exit 1
+fi
+
+api_dir=$1/api
+
+mkdir -p "$api_dir"
+touch "${api_dir}/$2-current.txt"
+touch "${api_dir}/$2-latest.txt"