WSL: Allow writing files to data distribution.

We will need to write files there in the next commit.  Note that we need to
manually use busybox, as the data distribution does not have the symlinks
for cp and chmod.

Signed-off-by: Mark Yen <mark.yen@suse.com>
(cherry picked from commit 43940e3)

Author: mook-as

src/k8s-engine/wsl.ts

@@ -786,21 +786,23 @@ export default class WSLBackend extends events.EventEmitter implements K8s.Kuber
   }
 
   /**
-   * Write the given contents to a given file name in the RD WSL distribution.
+   * Write the given contents to a given file name in the given WSL distribution.
    * @param filePath The destination file path, in the WSL distribution.
    * @param fileContents The contents of the file.
-   * @param permissions The file permissions.
+   * @param [options.permissions=0o644] The file permissions.
+   * @param [options.distro=INSTANCE_NAME] WSL distribution to write to.
    */
-  protected async writeFile(filePath: string, fileContents: string, permissions: fs.Mode = 0o644) {
+  protected async writeFile(filePath: string, fileContents: string, options?: Partial<{permissions: fs.Mode, distro: typeof INSTANCE_NAME | typeof DATA_INSTANCE_NAME}>) {
+    const distro = options?.distro ?? INSTANCE_NAME;
     const workdir = await fs.promises.mkdtemp(path.join(os.tmpdir(), `rd-${ path.basename(filePath) }-`));
 
     try {
       const scriptPath = path.join(workdir, path.basename(filePath));
-      const wslScriptPath = await this.wslify(scriptPath);
+      const wslScriptPath = await this.wslify(scriptPath, distro);
 
       await fs.promises.writeFile(scriptPath, fileContents.replace(/\r/g, ''), 'utf-8');
-      await this.execCommand('cp', wslScriptPath, filePath);
-      await this.execCommand('chmod', permissions.toString(8), filePath);
+      await this.execCommand({ distro }, 'busybox', 'cp', wslScriptPath, filePath);
+      await this.execCommand({ distro }, 'busybox', 'chmod', (options?.permissions ?? 0o644).toString(8), filePath);
     } finally {
       await fs.promises.rm(workdir, { recursive: true });
     }
@@ -1226,19 +1228,19 @@ export default class WSLBackend extends events.EventEmitter implements K8s.Kuber
             const rotateConf = LOGROTATE_K3S_SCRIPT.replace(/\r/g, '')
               .replace('/var/log', logPath);
 
-            await this.writeFile('/etc/init.d/k3s', SERVICE_SCRIPT_K3S, 0o755);
-            await this.writeFile('/etc/logrotate.d/k3s', rotateConf, 0o644);
+            await this.writeFile('/etc/init.d/k3s', SERVICE_SCRIPT_K3S, { permissions: 0o755 });
+            await this.writeFile('/etc/logrotate.d/k3s', rotateConf);
             await this.execCommand('mkdir', '-p', '/etc/cni/net.d');
-            await this.writeFile('/etc/cni/net.d/10-flannel.conflist', FLANNEL_CONFLIST, 0o644);
-            await this.writeFile('/etc/containerd/config.toml', CONTAINERD_CONFIG, 0o644);
+            await this.writeFile('/etc/cni/net.d/10-flannel.conflist', FLANNEL_CONFLIST);
+            await this.writeFile('/etc/containerd/config.toml', CONTAINERD_CONFIG);
             await this.writeConf('containerd', { log_owner: 'root' });
-            await this.writeFile('/etc/init.d/docker', SERVICE_SCRIPT_DOCKERD, 0o755);
+            await this.writeFile('/etc/init.d/docker', SERVICE_SCRIPT_DOCKERD, { permissions: 0o755 });
             await this.writeConf('docker', {
               WSL_HELPER_BINARY: await this.getWSLHelperPath(),
               LOG_DIR:           logPath,
             });
-            await this.writeFile(`/etc/init.d/buildkitd`, SERVICE_BUILDKITD_INIT, 0o755);
-            await this.writeFile(`/etc/conf.d/buildkitd`, SERVICE_BUILDKITD_CONF, 0o644);
+            await this.writeFile(`/etc/init.d/buildkitd`, SERVICE_BUILDKITD_INIT, { permissions: 0o755 });
+            await this.writeFile(`/etc/conf.d/buildkitd`, SERVICE_BUILDKITD_CONF);
             await this.execCommand('mkdir', '-p', '/var/lib/misc');
 
             await this.runInit();