refactor(cli): split config.ts into config/ modules

apps/cli/src/builder/nvram.ts

@@ -4,10 +4,21 @@ import {
     MissingNvramSourceError,
     NVRAM_ALIGNMENT,
     type NvramConfig,
-    nvramHasImage,
-    nvramImageFilename,
 } from "../config.js";
 
+/**
+ * Filename, relative to the build destination directory, of the image backing an nvram.
+ */
+export const nvramImageFilename = (label: string): string => `${label}.raw`;
+
+/**
+ * Whether an nvram is backed by an image file. A pristine nvram needs no image, as
+ * cartesi-machine fills its range with zeros. A `shared` one does, as there must be a file for
+ * the guest writes to be persisted to.
+ */
+export const nvramHasImage = (nvram: NvramConfig): boolean =>
+    nvram.filename !== undefined || nvram.shared === true;
+
 export const build = async (
     label: string,
     nvram: NvramConfig,

apps/cli/src/commands/shell.ts

@@ -3,7 +3,7 @@ import { ExecaError } from "execa";
 import fs from "fs-extra";
 import path from "node:path";
 import { getApplicationConfig, getContextPath } from "../base.js";
-import { nvramHasImage, nvramImageFilename } from "../config.js";
+import { nvramHasImage, nvramImageFilename } from "../builder/nvram.js";
 import { bootMachine } from "../machine.js";
 
 export const createShellCommand = () => {