diff --git a/build/utils/template_file.bzl b/build/utils/template_file.bzl
new file mode 100644
index 0000000..8dc6d24
--- /dev/null
+++ b/build/utils/template_file.bzl
@@ -0,0 +1,61 @@
+#  Copyright 2020 The Monogon Project Authors.
+#
+#  SPDX-License-Identifier: Apache-2.0
+#
+#  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.
+
+# Copyright 2018 Josh Pieper, jjp@pobox.com.
+#
+# 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.
+
+def _dictify(data):
+    result = dict([x.split("=", 1) for x in data])
+    return result
+
+def _template_file_impl(ctx):
+    out = ctx.actions.declare_file(ctx.label.name)
+
+    substitutions = dict(ctx.attr.substitutions)
+    substitutions.update(_dictify(ctx.attr.substitution_list))
+
+    ctx.actions.expand_template(
+        template = ctx.files.src[0],
+        output = out,
+        substitutions = substitutions,
+        is_executable = ctx.attr.is_executable,
+    )
+    return [DefaultInfo(
+        files = depset([out]),
+        data_runfiles = ctx.runfiles(files = [out]),
+    )]
+
+template_file = rule(
+    attrs = {
+        "src": attr.label(allow_files = True),
+        "is_executable": attr.bool(default = False),
+        "substitutions": attr.string_dict(),
+        "substitution_list": attr.string_list(),
+    },
+    output_to_genfiles = True,
+    implementation = _template_file_impl,
+)