feat(btrfs): add CLI and mock drivers with test utilities and interfaces

src/btrfs/__tests__/cli_driver.test.ts

@@ -0,0 +1,180 @@
+import {
+    afterAll,
+    beforeAll,
+    beforeEach,
+    describe,
+    it,
+} from '@std/testing/bdd';
+import {
+    assert,
+    assertEquals,
+    assertInstanceOf,
+    assertRejects,
+    assertStringIncludes,
+} from '@std/assert';
+import { join } from '@std/path';
+import { configure, getConsoleSink } from '@logtape/logtape';
+import { getPrettyFormatter } from '@logtape/pretty';
+
+import { BtrfsError, IBtrfsDriver } from '../interfaces/mod.ts';
+import { BtrfsCliDriver } from '../cli_driver.ts';
+import {
+    type BtrfsTestVolume,
+    createBtrfsTestVolume,
+    destroyBtrfsTestVolume,
+    disableQuota,
+    resetBtrfsTestVolume,
+} from '../utils/test_volume.ts';
+
+let vol: BtrfsTestVolume;
+let driver: IBtrfsDriver;
+
+await configure({
+    sinks: {
+        console: getConsoleSink({
+            formatter: getPrettyFormatter({
+                timestamp: 'date-time',
+                messageColor: '#ffffff',
+            }),
+        }),
+    },
+    loggers: [
+        { category: 'test', lowestLevel: 'trace', sinks: ['console'] },
+        { category: ['logtape', 'meta'], sinks: [] },
+    ],
+});
+
+describe('BtrfsCliDriver', () => {
+    beforeAll(async () => {
+        vol = await createBtrfsTestVolume(512);
+        driver = new BtrfsCliDriver(true, ['test', 'btrfs_cli_driver']);
+    });
+
+    afterAll(async () => {
+        await destroyBtrfsTestVolume(vol);
+    });
+
+    beforeEach(async () => {
+        // Wir starten jeden Test mit leerem FS
+        await resetBtrfsTestVolume(vol);
+    });
+
+    it('creates a new subvolume', async () => {
+        const name = 'vol1';
+        const path = await driver.createSubvolume(name, vol.mountPoint);
+
+        const list = await driver.listSubvolumes(vol.mountPoint);
+        assert(
+            list.includes(path),
+            `Expected ${path} to appear in list: ${JSON.stringify(list)}`,
+        );
+    });
+
+    it('deletes an existing subvolume', async () => {
+        const name = 'to-delete';
+        const path = await driver.createSubvolume(name, vol.mountPoint);
+
+        await driver.deleteSubvolume(path);
+
+        const list = await driver.listSubvolumes(vol.mountPoint);
+        assert(!list.includes(path), 'Deleted subvolume should not appear');
+    });
+
+    it('throws when deleting non-existent subvolume', async () => {
+        const bogus = join(vol.mountPoint, 'not-here');
+        await assertRejects(
+            () => driver.deleteSubvolume(bogus),
+            Error,
+        );
+    });
+
+    it('lists multiple subvolumes correctly', async () => {
+        const paths = await Promise.all([
+            driver.createSubvolume('a', vol.mountPoint),
+            driver.createSubvolume('b', vol.mountPoint),
+            driver.createSubvolume('c', vol.mountPoint),
+        ]);
+
+        const list = await driver.listSubvolumes(vol.mountPoint);
+        for (const p of paths) {
+            assert(list.includes(p), `Expected ${p} in list`);
+        }
+    });
+
+    it('sets compression and quota without throwing', async () => {
+        const path = await driver.createSubvolume('cfg', vol.mountPoint);
+        await driver.setCompression(path, 'zstd');
+        await driver.setQuota(path, '128M');
+        assert(true); // falls keine Exception geworfen wird
+    });
+
+    it('returns getInfo() = exists:true for valid subvolume', async () => {
+        const path = await driver.createSubvolume('exists', vol.mountPoint);
+        const info = await driver.getInfo?.(path);
+        assert(info?.exists, 'Expected exists=true');
+    });
+
+    it('returns getInfo() = exists:false for invalid path', async () => {
+        const bogus = join(vol.mountPoint, 'not-real');
+        const info = await driver.getInfo?.(bogus);
+        assertEquals(info?.exists, false);
+    });
+});
+
+describe('BtrfsCliDriver (error handling)', () => {
+    beforeAll(async () => {
+        vol = await createBtrfsTestVolume(512);
+        driver = new BtrfsCliDriver(true, ['test', 'btrfs_cli_driver']);
+    });
+
+    afterAll(async () => {
+        await destroyBtrfsTestVolume(vol);
+    });
+
+    beforeEach(async () => {
+        await resetBtrfsTestVolume(vol);
+    });
+
+    it('throws BtrfsError with code and details on invalid command', async () => {
+        const err = await assertRejects(
+            () =>
+                // deno-lint-ignore no-explicit-any
+                (driver as any).constructor.run([
+                    'btrfs',
+                    'subvolume',
+                    'invalid-op',
+                ], true),
+            BtrfsError,
+        );
+
+        assertInstanceOf(err, BtrfsError);
+        assert(typeof err.code === 'number', 'Error should have exit code');
+        assertStringIncludes(err.details ?? '', 'invalid-op');
+    });
+
+    it('throws BtrfsError when setting quota without quota enabled', async () => {
+        const path = await driver.createSubvolume('quota-test', vol.mountPoint);
+        await disableQuota(vol.mountPoint);
+        const err = await assertRejects(
+            () => driver.setQuota(path, '10M'),
+            BtrfsError,
+        );
+
+        assertInstanceOf(err, BtrfsError);
+        assertStringIncludes(err.details ?? '', 'quota');
+    });
+
+    it('handles gracefully when deleting missing subvolume', async () => {
+        const bogus = join(vol.mountPoint, 'nope');
+        await assertRejects(
+            () => driver.deleteSubvolume(bogus),
+            BtrfsError,
+        );
+    });
+
+    it('returns false on getInfo for a non-existent path (and no throw)', async () => {
+        const bogus = join(vol.mountPoint, 'ghost');
+        const info = await driver.getInfo?.(bogus);
+        assertEquals(info?.exists, false);
+    });
+});

src/btrfs/cli_driver.ts

@@ -0,0 +1,159 @@
+import { BtrfsError, IBtrfsDriver } from './interfaces/mod.ts';
+import { join, resolve } from '@std/path';
+import { getLogger, Logger } from '@logtape/logtape';
+
+/**
+ * CLI-based implementation of IBtrfsDriver.
+ * Wraps native `btrfs` commands with consistent logging and error handling.
+ */
+export class BtrfsCliDriver implements IBtrfsDriver {
+    private readonly log: Logger;
+    private readonly needSudo: boolean;
+
+    constructor(needSudo = false, loggerCategory = ['btrfs', 'cli_driver']) {
+        this.needSudo = needSudo;
+        this.log = getLogger(loggerCategory);
+    }
+
+    /** Internal helper to execute a system command and normalize its result. */
+    private static async run(
+        cmd: string[],
+        sudo = true,
+        allowFailure = false,
+    ): Promise<string> {
+        const fullCmd = sudo ? ['sudo', ...cmd] : cmd;
+        const proc = new Deno.Command(fullCmd[0], { args: fullCmd.slice(1) });
+        const { code, stdout, stderr } = await proc.output();
+
+        const out = new TextDecoder().decode(stdout).trim();
+        const err = new TextDecoder().decode(stderr).trim();
+
+        if (code !== 0 && !allowFailure) {
+            throw new BtrfsError(`Btrfs command failed: ${fullCmd.join(' ')}`, {
+                code,
+                details: err || out || 'Unknown error',
+            });
+        }
+
+        return out;
+    }
+
+    async createSubvolume(name: string, basePath: string): Promise<string> {
+        this.log.trace(`Creating subvolume ${name} in ${basePath}`);
+        const path = join(basePath, name);
+
+        try {
+            const response = await BtrfsCliDriver.run(
+                ['btrfs', 'subvolume', 'create', path],
+                this.needSudo,
+            );
+            this.log.trace(`Created subvolume at ${path}: ${response}`);
+            return path;
+        } catch (err) {
+            if (
+                err instanceof BtrfsError &&
+                err.details?.includes('File exists')
+            ) {
+                this.log.error(`Subvolume already exists: ${path}`);
+            }
+            throw err;
+        }
+    }
+
+    async deleteSubvolume(path: string): Promise<void> {
+        this.log.trace(`Deleting subvolume at ${path}`);
+        try {
+            const response = await BtrfsCliDriver.run(
+                ['btrfs', 'subvolume', 'delete', path],
+                this.needSudo,
+            );
+            this.log.trace(`Deleted subvolume at ${path}: ${response}`);
+        } catch (err) {
+            if (
+                err instanceof BtrfsError &&
+                err.details?.includes('No such file')
+            ) {
+                this.log.error(`Subvolume not found during delete: ${path}`);
+            }
+            throw err;
+        }
+    }
+
+    async listSubvolumes(basePath: string): Promise<string[]> {
+        this.log.trace(`Listing subvolumes in ${basePath}`);
+        try {
+            const out = await BtrfsCliDriver.run(
+                ['btrfs', 'subvolume', 'list', '-o', basePath],
+                this.needSudo,
+            );
+            this.log.trace(`Subvolumes in ${basePath}:\n${out}`);
+
+            return out
+                .split('\n')
+                .filter(Boolean)
+                .map((line) => {
+                    const parts = line.trim().split(/\s+/);
+                    const last = parts[parts.length - 1];
+                    return resolve(basePath, last);
+                });
+        } catch (err) {
+            this.log.error(`Failed to list subvolumes in ${basePath}: ${err}`);
+            throw err;
+        }
+    }
+
+    async setCompression(path: string, method: string): Promise<void> {
+        this.log.trace(`Setting compression on ${path} to ${method}`);
+        try {
+            const response = await BtrfsCliDriver.run(
+                ['btrfs', 'property', 'set', path, 'compression', method],
+                this.needSudo,
+            );
+            this.log.trace(`Set compression on ${path}: ${response}`);
+        } catch (err) {
+            this.log.error(`Failed to set compression on ${path}: ${err}`);
+            throw new BtrfsError(`Failed to set compression on ${path}`, {
+                code: (err as BtrfsError).code,
+                details: (err as BtrfsError).details,
+            });
+        }
+    }
+
+    async setQuota(path: string, limit: string): Promise<void> {
+        this.log.trace(`Setting quota on ${path} to ${limit}`);
+        try {
+            const response = await BtrfsCliDriver.run(
+                ['btrfs', 'qgroup', 'limit', limit, path],
+                this.needSudo,
+            );
+            this.log.trace(`Set quota on ${path}: ${response}`);
+        } catch (err) {
+            if (
+                err instanceof BtrfsError &&
+                err.details?.includes('quota not enabled')
+            ) {
+                this.log.error(`Quota not enabled on ${path}`);
+            }
+            throw err;
+        }
+    }
+
+    async getInfo(path: string): Promise<{ exists: boolean }> {
+        this.log.trace(`Getting info for subvolume at ${path}`);
+        try {
+            const res = await BtrfsCliDriver.run(
+                ['btrfs', 'subvolume', 'show', path],
+                this.needSudo,
+                true,
+            );
+            this.log.trace(`Got info for subvolume at ${path}: ${res}`);
+            return { exists: res.length > 0 };
+        } catch (err) {
+            if (err instanceof BtrfsError) {
+                this.log.trace(`Subvolume not found: ${path}`);
+                return { exists: false };
+            }
+            throw err;
+        }
+    }
+}

src/btrfs/interfaces/driver.ts

@@ -0,0 +1,56 @@
+/**
+ * Interface for a Btrfs driver abstraction.
+ *
+ * Implementations should wrap btrfs subvolume, compression, and quota operations
+ * while keeping a promise-based API suitable for Deno.
+ */
+export interface IBtrfsDriver {
+    /**
+     * Create a new Btrfs subvolume.
+     * @param name Name of the subvolume to create.
+     * @param basePath Directory under which the subvolume will be created.
+     * @returns Full absolute path of the created subvolume (basePath + name).
+     * @throws {BtrfsError} if the operation fails.
+     */
+    createSubvolume(name: string, basePath: string): Promise<string>;
+
+    /**
+     * Delete an existing Btrfs subvolume.
+     * @param path Full path to the subvolume to delete.
+     * @throws {BtrfsError} if the operation fails.
+     */
+    deleteSubvolume(path: string): Promise<void>;
+
+    /**
+     * Configure compression for a subvolume or path.
+     * @param path Full path to the subvolume or directory.
+     * @param method Compression method (e.g., "zstd", "lz4").
+     * @throws {BtrfsError} if the operation fails.
+     */
+    setCompression(path: string, method: string): Promise<void>;
+
+    /**
+     * Set a quota/space limit for a subvolume.
+     * @param path Full path to the subvolume.
+     * @param limit Human-readable size (e.g., "10G", "512M").
+     * @throws {BtrfsError} if the operation fails.
+     */
+    setQuota(path: string, limit: string): Promise<void>;
+
+    /**
+     * List subvolumes beneath a base directory.
+     * @param basePath Directory to scan for subvolumes.
+     * @returns A promise resolving to a list of subvolume paths.
+     * @throws {BtrfsError} if the operation fails.
+     */
+    listSubvolumes(basePath: string): Promise<string[]>;
+
+    /**
+     * Optional check for subvolume existence or metadata.
+     * @param path Path to check.
+     * @returns A promise resolving to minimal info ({ exists: boolean }) plus optional metadata.
+     */
+    getInfo?(
+        path: string,
+    ): Promise<{ exists: boolean; [key: string]: unknown }>;
+}

src/btrfs/interfaces/errors.ts

@@ -0,0 +1,21 @@
+/**
+ * Error thrown by Btrfs driver implementations on operation failure.
+ *
+ * Implementations may extend this to include exit codes or stderr output.
+ */
+export class BtrfsError extends Error {
+    /** Optional underlying error code or process exit code. */
+    readonly code?: number | string;
+    /** Optional raw stderr or diagnostic message from the system. */
+    readonly details?: string;
+
+    constructor(
+        message: string,
+        options?: { code?: number | string; details?: string },
+    ) {
+        super(message);
+        this.name = 'BtrfsError';
+        this.code = options?.code;
+        this.details = options?.details;
+    }
+}

src/btrfs/interfaces/mod.ts

@@ -0,0 +1,4 @@
+// DO NOT EDIT! This file is automatically generated.
+
+export type { IBtrfsDriver } from './driver.ts';
+export { BtrfsError } from './errors.ts';

src/btrfs/mock_driver.ts

@@ -0,0 +1,88 @@
+// deno-lint-ignore-file require-await
+import { IBtrfsDriver } from './interfaces/mod.ts';
+import { join, resolve } from '@std/path';
+import { getLogger, Logger } from '@logtape/logtape';
+
+/**
+ * In-memory mock implementation of IBtrfsDriver.
+ *
+ * Behaves like the real BtrfsCliDriver but stores subvolumes and metadata
+ * in plain JavaScript objects instead of touching the filesystem.
+ */
+export class MockBtrfsDriver implements IBtrfsDriver {
+    private readonly log: Logger;
+
+    /** Internal simulated subvolume registry */
+    private readonly volumes = new Map<
+        string,
+        { compression?: string; quota?: string }
+    >();
+
+    constructor(_needSudo = false, loggerCategory = ['btrfs', 'mock_driver']) {
+        this.log = getLogger(loggerCategory);
+    }
+
+    /** Simulate creation of a subvolume under a base path. */
+    async createSubvolume(name: string, basePath: string): Promise<string> {
+        const path = resolve(join(basePath, name));
+        this.log.trace(`(mock) Creating subvolume at ${path}`);
+
+        if (this.volumes.has(path)) {
+            throw new Error(`(mock) Subvolume already exists: ${path}`);
+        }
+
+        this.volumes.set(path, {});
+        return path;
+    }
+
+    /** Simulate deletion of a subvolume. */
+    async deleteSubvolume(path: string): Promise<void> {
+        const resolved = resolve(path);
+        this.log.trace(`(mock) Deleting subvolume at ${resolved}`);
+
+        if (!this.volumes.delete(resolved)) {
+            throw new Error(`(mock) Subvolume not found: ${resolved}`);
+        }
+    }
+
+    /** Return all simulated subvolumes under a base path. */
+    async listSubvolumes(basePath: string): Promise<string[]> {
+        const prefix = resolve(basePath);
+        const result = [...this.volumes.keys()].filter((v) =>
+            v.startsWith(prefix)
+        );
+        this.log.trace(
+            `(mock) Listing subvolumes under ${prefix}: ${result.length} found`,
+        );
+        return result;
+    }
+
+    /** Simulate setting a compression property. */
+    async setCompression(path: string, method: string): Promise<void> {
+        const resolved = resolve(path);
+        this.log.trace(`(mock) Setting compression=${method} on ${resolved}`);
+        const vol = this.volumes.get(resolved);
+        if (!vol) throw new Error(`(mock) Subvolume not found: ${resolved}`);
+        vol.compression = method;
+    }
+
+    /** Simulate applying a quota. */
+    async setQuota(path: string, limit: string): Promise<void> {
+        const resolved = resolve(path);
+        this.log.trace(`(mock) Setting quota=${limit} on ${resolved}`);
+        const vol = this.volumes.get(resolved);
+        if (!vol) throw new Error(`(mock) Subvolume not found: ${resolved}`);
+        vol.quota = limit;
+    }
+
+    /** Return simulated metadata for a subvolume. */
+    async getInfo(
+        path: string,
+    ): Promise<{ exists: boolean; [key: string]: unknown }> {
+        const resolved = resolve(path);
+        const vol = this.volumes.get(resolved);
+        const exists = !!vol;
+        this.log.trace(`(mock) getInfo(${resolved}) => exists=${exists}`);
+        return exists ? { exists, ...vol } : { exists };
+    }
+}

src/btrfs/utils/mod.ts

@@ -0,0 +1,9 @@
+// DO NOT EDIT! This file is automatically generated.
+
+export {
+    createBtrfsTestVolume,
+    destroyBtrfsTestVolume,
+    disableQuota,
+    resetBtrfsTestVolume,
+} from './test_volume.ts';
+export type { BtrfsTestVolume } from './test_volume.ts';

src/btrfs/utils/test_volume.ts

@@ -0,0 +1,115 @@
+/**
+ * Utilities to create, mount, unmount, and clean Btrfs test volumes.
+ * Designed for use in Deno integration tests.
+ */
+
+import { join } from '@std/path';
+import { getLogger } from '@logtape/logtape';
+
+const log = getLogger(['test', 'btrfs-test-volume']);
+
+/**
+ * Represents an active temporary Btrfs test volume.
+ */
+export interface BtrfsTestVolume {
+    /** Base temporary directory for the image and mount point. */
+    readonly tmpDir: string;
+
+    /** Full path to the loopback image file. */
+    readonly imgPath: string;
+
+    /** Mount point directory for the Btrfs filesystem. */
+    readonly mountPoint: string;
+}
+
+/**
+ * Executes a system command and throws on non-zero exit.
+ */
+async function run(cmd: string, args: string[]) {
+    const proc = new Deno.Command(cmd, { args });
+    const res = await proc.output();
+    if (res.code !== 0) {
+        const err = new TextDecoder().decode(res.stderr);
+        log.error(`[CMD] ${cmd} ${args.join(' ')} failed: ${err.trim()}`);
+        throw new Error(`[${cmd}] failed: ${err.trim()}`);
+    }
+}
+
+/**
+ * Creates and mounts a temporary Btrfs volume under /tmp (or system temp dir).
+ *
+ * @param sizeMB Size of the image in megabytes (default: 512)
+ * @returns BtrfsTestVolume describing paths.
+ */
+export async function createBtrfsTestVolume(
+    sizeMB = 512,
+): Promise<BtrfsTestVolume> {
+    const tmpDir = await Deno.makeTempDir({ prefix: 'btrfs-test-' });
+    const imgPath = join(tmpDir, 'btrfs.img');
+    const mountPoint = join(tmpDir, 'mnt');
+
+    log.info(`[BTRFS] Creating test volume at ${tmpDir} (${sizeMB}MB)`);
+
+    // Create and format the image
+    await run('truncate', ['-s', `${sizeMB}M`, imgPath]);
+    await run('mkfs.btrfs', ['-f', imgPath]);
+
+    // Mount it via loop device
+    await Deno.mkdir(mountPoint);
+    await run('sudo', ['mount', '-o', 'loop', imgPath, mountPoint]);
+
+    // Enable quotas (required for quota operations)
+    await run('sudo', ['btrfs', 'quota', 'enable', mountPoint]);
+
+    log.info(`[BTRFS] Mounted at ${mountPoint}`);
+    return { tmpDir, imgPath, mountPoint };
+}
+
+/**
+ * Unmounts and removes a previously created test volume.
+ */
+export async function destroyBtrfsTestVolume(
+    vol: BtrfsTestVolume,
+): Promise<void> {
+    log.info(`[BTRFS] Unmounting ${vol.mountPoint}`);
+    try {
+        await run('sudo', ['umount', vol.mountPoint]);
+    } catch (e) {
+        if (e instanceof Error) {
+            log.warn(`[WARN] umount failed: ${e.message}`);
+        } else {
+            log.warn(`[WARN] umount failed: ${String(e)}`);
+        }
+    }
+
+    log.info(`[BTRFS] Cleaning up ${vol.tmpDir}`);
+    await Deno.remove(vol.tmpDir, { recursive: true });
+}
+
+/**
+ * Recreates the filesystem within an existing test volume.
+ * Equivalent to wiping all subvolumes (fresh mkfs.btrfs on the same image).
+ *
+ * This is faster than deleting and remounting everything manually.
+ */
+export async function resetBtrfsTestVolume(
+    vol: BtrfsTestVolume,
+): Promise<void> {
+    log.info(`[BTRFS] Resetting test volume`);
+    // Unmount, reformat, remount
+    await run('sudo', ['umount', vol.mountPoint]);
+    await run('mkfs.btrfs', ['-f', vol.imgPath]);
+    await run('sudo', ['mount', '-o', 'loop', vol.imgPath, vol.mountPoint]);
+    await run('sudo', ['btrfs', 'quota', 'enable', vol.mountPoint]);
+    log.info(`[BTRFS] Volume reinitialized`);
+}
+
+/**
+ * Disables quota on a mounted Btrfs filesystem.
+ * Useful for error tests
+ */
+export async function disableQuota(mountPoint: string): Promise<void> {
+    log.info(`[BTRFS] Disabling quota on ${mountPoint}`);
+    await run('sudo', ['btrfs', 'quota', 'disable', mountPoint]);
+    log.info(`[BTRFS] Quota disabled`);
+}