diff --git a/android/packaging.go b/android/packaging.go
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+// 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
+
+// PackagingSpec abstracts a request to place a built artifact at a certain path in a package.
+// A package can be the traditional <partition>.img, but isn't limited to those. Other examples could
+// be a new filesystem image that is a subset of system.img (e.g. for an Android-like mini OS running
+// on a VM), or a zip archive for some of the host tools.
+type PackagingSpec struct {
+	// Path relative to the root of the package
+	relPathInPackage string
+
+	// The path to the built artifact
+	srcPath Path
+
+	// If this is not empty, then relPathInPackage should be a symlink to this target. (Then
+	// srcPath is of course ignored.)
+	symlinkTarget string
+
+	// Whether relPathInPackage should be marked as executable or not
+	executable bool
+}