diff --git a/osbase/build/genproductinfo/defs.bzl b/osbase/build/genproductinfo/defs.bzl
new file mode 100644
index 0000000..c484bbb
--- /dev/null
+++ b/osbase/build/genproductinfo/defs.bzl
@@ -0,0 +1,68 @@
+# Copyright The Monogon Project Authors.
+# SPDX-License-Identifier: Apache-2.0
+
+def _product_info_impl(ctx):
+    product_info_file = ctx.actions.declare_file(ctx.label.name + ".json")
+    args = ctx.actions.args()
+    args.add("-status_file", ctx.info_file)
+    args.add("-product_info_file", product_info_file)
+    args.add("-os_release_file", ctx.outputs.out_os_release)
+    args.add("-stamp_var", ctx.attr.stamp_var)
+    args.add("-name", ctx.attr.os_name)
+    args.add("-id", ctx.attr.os_id)
+    args.add("-architecture", ctx.attr.architecture)
+    args.add("-build_flags", "-".join(ctx.attr.build_flags))
+    args.add_all(ctx.attr.components, before_each = "-component")
+    ctx.actions.run(
+        mnemonic = "GenProductInfo",
+        progress_message = "Generating product info",
+        inputs = [ctx.info_file],
+        outputs = [product_info_file, ctx.outputs.out_os_release],
+        executable = ctx.executable._genproductinfo,
+        arguments = [args],
+    )
+    return [DefaultInfo(files = depset([product_info_file]))]
+
+_product_info = rule(
+    implementation = _product_info_impl,
+    attrs = {
+        "os_name": attr.string(mandatory = True),
+        "os_id": attr.string(mandatory = True),
+        "stamp_var": attr.string(mandatory = True),
+        "components": attr.string_list(),
+        "out_os_release": attr.output(
+            mandatory = True,
+            doc = """Output, contains the os-release file.""",
+        ),
+        "architecture": attr.string(mandatory = True),
+        "build_flags": attr.string_list(),
+        "_genproductinfo": attr.label(
+            default = ":genproductinfo",
+            cfg = "exec",
+            executable = True,
+            allow_files = True,
+        ),
+    },
+)
+
+def _product_info_macro_impl(**kwargs):
+    _product_info(
+        architecture = select({
+            "@platforms//cpu:x86_64": "x86_64",
+            "@platforms//cpu:aarch64": "aarch64",
+        }),
+        build_flags = select({
+            Label(":flag_debug"): ["debug"],
+            "//conditions:default": [],
+        }) + select({
+            Label(":flag_race"): ["race"],
+            "//conditions:default": [],
+        }),
+        **kwargs
+    )
+
+product_info = macro(
+    inherit_attrs = _product_info,
+    attrs = {"architecture": None, "build_flags": None},
+    implementation = _product_info_macro_impl,
+)