Add the copy-nixos-config script.

.bauke/bin/copy-nixos-config

@@ -0,0 +1,7 @@
+#!/usr/bin/env zsh
+
+deno run \
+  --allow-read \
+  --allow-run="hostname,sudo" \
+  "$BAUKE_DIR/scripts/copy-nixos-config.ts" \
+  "$@"

.bauke/scripts/copy-nixos-config.ts

@@ -0,0 +1,34 @@
+import { Command } from "https://deno.land/x/cliffy@v0.25.5/command/mod.ts";
+import { runAndReturnStdout } from "./utilities.ts";
+
+async function main(): Promise<void> {
+  const { options } = await new Command()
+    .name("copy-nixos-config")
+    .description(
+      'Copy NixOS configuration from "$BAUKE_DIR/nix/<hostname>/" to "/etc/nixos/"',
+    )
+    .option("--hostname", "The machine's configuration to copy.", {
+      default: (await runAndReturnStdout({ cmd: ["hostname"] })).trim(),
+    })
+    .parse(Deno.args);
+
+  const sourceDir = new URL(`../nix/${options.hostname}/`, import.meta.url);
+  const files = Array.from(Deno.readDirSync(sourceDir))
+    .filter((entry) => entry.name.endsWith(".nix"))
+    .map((entry) => sourceDir.pathname + entry.name);
+
+  await Deno.run({
+    cmd: [
+      "sudo",
+      "cp",
+      "--preserve=timestamps",
+      "--verbose",
+      ...files,
+      "/etc/nixos/",
+    ],
+  }).status();
+}
+
+if (import.meta.main) {
+  void main();
+}