test(btrfs): skip cli driver tests if no loop devices are available

src/btrfs/__tests__/cli_driver.test.ts

@@ -23,6 +23,7 @@ import {
     createBtrfsTestVolume,
     destroyBtrfsTestVolume,
     disableQuota,
+    hasLoopDevices,
     resetBtrfsTestVolume,
 } from '../utils/test_volume.ts';
 
@@ -44,6 +45,11 @@ await configure({
     ],
 });
 
+if (!(await hasLoopDevices())) {
+    console.warn('Skipping BtrfsCliDriver tests: No loop devices available');
+    Deno.exit(0);
+}
+
 describe('BtrfsCliDriver', () => {
     beforeAll(async () => {
         vol = await createBtrfsTestVolume(512);

src/btrfs/utils/mod.ts

@@ -4,6 +4,7 @@ export {
     createBtrfsTestVolume,
     destroyBtrfsTestVolume,
     disableQuota,
+    hasLoopDevices,
     resetBtrfsTestVolume,
 } from './test_volume.ts';
 export type { BtrfsTestVolume } from './test_volume.ts';

src/btrfs/utils/test_volume.ts

@@ -113,3 +113,14 @@ export async function disableQuota(mountPoint: string): Promise<void> {
     await run('sudo', ['btrfs', 'quota', 'disable', mountPoint]);
     log.info(`[BTRFS] Quota disabled`);
 }
+
+/**
+ * Checks if the current system has loop devices available.
+ * Used to skip tests when running in environments without /dev/loop-control.
+ */
+export async function hasLoopDevices(): Promise<boolean> {
+    const { code } = await new Deno.Command('sh', {
+        args: ['-c', 'test -e /dev/loop-control && exit 0 || exit 1'],
+    }).output();
+    return code === 0;
+}