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-rw-r--r--tools/nixery/prepare-image/default.nix18
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diff --git a/tools/nixery/prepare-image/default.nix b/tools/nixery/prepare-image/default.nix
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+++ b/tools/nixery/prepare-image/default.nix
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+# Copyright 2022 The TVL Contributors
+# SPDX-License-Identifier: Apache-2.0
+
+# This file builds a wrapper script called by Nixery to ask for the
+# content information for a given image.
+#
+# The purpose of using a wrapper script is to ensure that the paths to
+# all required Nix files are set correctly at runtime.
+
+{ pkgs ? import <nixpkgs> { } }:
+
+pkgs.writeShellScriptBin "nixery-prepare-image" ''
+  exec ${pkgs.nix}/bin/nix-build \
+    --show-trace \
+    --no-out-link "$@" \
+    --argstr loadPkgs ${./load-pkgs.nix} \
+    ${./prepare-image.nix}
+''