sysfs: Fixed root directory operations

Author: james-pre

src/fs/sysfs.ts

@@ -1,14 +1,17 @@
-import { FileSystem, Sync } from '@zenfs/core';
+import { FileSystem, Inode, Sync } from '@zenfs/core';
 import type { InodeLike } from '@zenfs/core';
 import { withErrno } from 'kerium';
-import { kobj_find, KObject } from '../kobject.js';
+import { kobj_find, KObject, sysfs_root } from '../kobject.js';
+import { S_IFDIR } from '@zenfs/core/constants';
 
 /**
  * @todo
  */
 export class SysFS extends Sync(FileSystem) {
 	protected readonly initTime = Date.now();
 
+	protected readonly _rootInode = new Inode({ mode: S_IFDIR | 0o555 });
+
 	public constructor() {
 		super(0x62656572, 'sysfs');
 	}
@@ -21,6 +24,7 @@ export class SysFS extends Sync(FileSystem) {
 	 * @todo
 	 */
 	statSync(path: string): InodeLike {
+		if (path === '/') return this._rootInode;
 		const node = kobj_find(path);
 		if (!node) throw withErrno('ENOENT');
 		throw withErrno('ENOSYS');
@@ -50,6 +54,7 @@ export class SysFS extends Sync(FileSystem) {
 	}
 
 	readdirSync(path: string): string[] {
+		if (path === '/') return Array.from(sysfs_root.keys());
 		const obj = kobj_find(path);
 		if (!(obj instanceof KObject)) throw withErrno('ENOTDIR');
 		return [...obj.children.keys(), ...obj.attributes.keys()];

src/kobject.ts

@@ -1,7 +1,10 @@
 import { dirname } from '@zenfs/core/path.js';
 import { withErrno } from 'kerium';
 
-const root = new Map<string, KObject>();
+/**
+ * @internal
+ */
+export const sysfs_root = new Map<string, KObject>();
 
 /**
  * Unlike Linux, we don't use ksets, ktypes, or attribute groups.
@@ -19,7 +22,7 @@ export class KObject {
 		public parent: KObject | null
 	) {
 		if (!parent) {
-			root.set(name, this);
+			sysfs_root.set(name, this);
 		} else {
 			parent.children.set(name, this);
 		}
@@ -41,7 +44,7 @@ export interface KObjectAttribute extends Attribute {
 
 export function kobj_find(path: string): KObject | Attribute | null {
 	const [group, ...parts] = path.split('/').filter(p => p);
-	let current: KObject | Attribute | undefined = root.get(group);
+	let current: KObject | Attribute | undefined = sysfs_root.get(group);
 	for (const part of parts) {
 		if (!(current instanceof KObject)) throw withErrno('ENOTDIR');
 		if (!current.children.has(part)) throw withErrno('ENOENT');