Diagnostics: Add check for lima disk size overrides

This adds a check to see if the user has a lima override file set, and disk
sizes set within that.  If this is present, it breaks our settings for the
disk size.

Signed-off-by: Mark Yen <[email protected]>

Author: mook-as

pkg/rancher-desktop/main/diagnostics/diagnostics.ts

@@ -59,6 +59,7 @@ export class DiagnosticsManager {
           import('./kubeContext'),
           import('./kubeVersionsAvailable'),
           import('./limaDarwin'),
+          import('./limaOverrides'),
           import('./mockForScreenshots'),
           import('./pathManagement'),
           import('./rdBinInShell'),

pkg/rancher-desktop/main/diagnostics/limaOverrides.ts

@@ -0,0 +1,71 @@
+import fs from 'node:fs';
+import path from 'node:path';
+
+import yaml from 'yaml';
+
+import { DiagnosticsCategory, DiagnosticsChecker, DiagnosticsCheckerSingleResult } from './types';
+
+import paths from '@pkg/utils/paths';
+
+/**
+ * Check for things in the user's Lima overrides file.  We never create the file
+ * ourselves, but the user may manually create it to adjust how Lima runs; it
+ * may end up conflicting with what we attempt to do.
+ */
+const CheckLimaOverrides: DiagnosticsChecker = {
+  id:       'LIMA_OVERRIDES',
+  category: DiagnosticsCategory.ContainerEngine,
+  applicable() {
+    return Promise.resolve(process.platform !== 'win32');
+  },
+  async check() {
+    const overridePath = path.join(paths.lima, '_config', 'override.yaml');
+    const checkers = {
+      /**
+       * Check if the user has an override for the lima disk size.  We have built-in
+       * support for the feature now, and overrides would cause our settings to be
+       * ignored.
+       */
+      DISK_SIZE: (override) => {
+        if ('disk' in override) {
+          return {
+            description: `Disk overrides are set in Lima override file \`${ overridePath }\``,
+            passed:      false,
+            fixes:       [{
+              description: `Remove Lima override file \`${ overridePath }\``,
+            }],
+          };
+        }
+        return {
+          description: `Disk size override not specified in Lima override file \`${ overridePath }\``,
+          passed:      true,
+          fixes:       [],
+        };
+      },
+    } satisfies Record<string, (override: any) => Omit<DiagnosticsCheckerSingleResult, 'id'>>;
+    const override = await (async function() {
+      try {
+        return yaml.parse(await fs.promises.readFile(overridePath, 'utf-8'));
+      } catch {
+        return undefined;
+      }
+    })();
+
+    if (!override || typeof override !== 'object') {
+      // Override file does not exist, or is not valid YAML
+      return Object.keys(checkers).map(id => ({
+        id,
+        description: `Override file \`${ overridePath }\` not loaded`,
+        passed:      true,
+        fixes:       [],
+      }));
+    }
+
+    return Object.entries(checkers).map(([id, checker]) => ({
+      id,
+      ...checker(override),
+    }));
+  },
+};
+
+export default CheckLimaOverrides;