Check package restrictions for Java libs.

Test: m checkbuild; inspect verbose log.
Test: Manual - compile with unmet restrictions.
Bug: 122937705
Change-Id: I9360ae8b6d9ce016b7827be5e8ffc6eb521809b7

scripts/package-check.sh

@@ -0,0 +1,72 @@
+#!/bin/bash
+#
+# 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.
+
+set -e
+
+if [[ $# -le 1 ]]; then
+  cat <<EOF
+Usage:
+  package-check.sh <jar-file> <package-list>
+Checks that the class files in the <jar file> are in the <package-list> or
+sub-packages.
+EOF
+  exit 1
+fi
+
+jar_file=$1
+shift
+if [[ ! -f ${jar_file} ]]; then
+  echo "jar file \"${jar_file}\" does not exist."
+  exit 1
+fi
+
+prefixes=()
+while [[ $# -ge 1 ]]; do
+  package="$1"
+  if [[ "${package}" = */* ]]; then
+    echo "Invalid package \"${package}\". Use dot notation for packages."
+    exit 1
+  fi
+  # Transform to a slash-separated path and add a trailing slash to enforce
+  # package name boundary.
+  prefixes+=("${package//\./\/}/")
+  shift
+done
+
+# Get the file names from the jar file.
+zip_contents=`zipinfo -1 $jar_file`
+
+# Check all class file names against the expected prefixes.
+old_ifs=${IFS}
+IFS=$'\n'
+for zip_entry in ${zip_contents}; do
+  # Check the suffix.
+  if [[ "${zip_entry}" = *.class ]]; then
+    # Match against prefixes.
+    found=false
+    for prefix in ${prefixes[@]}; do
+      if [[ "${zip_entry}" = "${prefix}"* ]]; then
+        found=true
+        break
+      fi
+    done
+    if [[ "${found}" == "false" ]]; then
+      echo "Class file ${zip_entry} is outside specified packages."
+      exit 1
+    fi
+  fi
+done
+IFS=${old_ifs}