diff --git a/android/sandbox.go b/android/sandbox.go
new file mode 100644
index 0000000..ed022fb
--- /dev/null
+++ b/android/sandbox.go
@@ -0,0 +1,47 @@
+// Copyright 2020 Google Inc. All rights reserved.
+//
+// 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.
+
+package android
+
+import (
+	"fmt"
+	"os"
+)
+
+func init() {
+	// Stash the working directory in a private variable and then change the working directory
+	// to "/", which will prevent untracked accesses to files by Go Soong plugins. The
+	// SOONG_SANDBOX_SOONG_BUILD environment variable is set by soong_ui, and is not
+	// overrideable on the command line.
+
+	orig, err := os.Getwd()
+	if err != nil {
+		panic(fmt.Errorf("failed to get working directory: %s", err))
+	}
+	absSrcDir = orig
+
+	if getenv("SOONG_SANDBOX_SOONG_BUILD") == "true" {
+		err = os.Chdir("/")
+		if err != nil {
+			panic(fmt.Errorf("failed to change working directory to '/': %s", err))
+		}
+	}
+}
+
+// DO NOT USE THIS FUNCTION IN NEW CODE.
+// Deprecated: This function will be removed as soon as the existing use cases that use it have been
+// replaced.
+func AbsSrcDirForExistingUseCases() string {
+	return absSrcDir
+}