function getCLIPath(execPath: string, appRoot: string, isBuilt: boolean): string {

	// Windows
	if (isWindows) {
		if (isBuilt) {
			return path.join(path.dirname(execPath), 'bin', `${product.applicationName}.cmd`);
		}

		return path.join(appRoot, 'scripts', 'code-cli.bat');
	}

	// Linux
	if (isLinux) {
		if (isBuilt) {
			return path.join(path.dirname(execPath), 'bin', `${product.applicationName}`);
		}

		return path.join(appRoot, 'scripts', 'code-cli.sh');
	}

	// macOS
	if (isBuilt) {
		return path.join(appRoot, 'bin', 'code');
	}

	return path.join(appRoot, 'scripts', 'code-cli.sh');
}

export async function mkdirp(path: string, mode?: number, token?: CancellationToken): Promise<void> {
	const mkdir = async () => {
		try {
			await promisify(fs.mkdir)(path, mode);
		} catch (error) {

			// ENOENT: a parent folder does not exist yet
			if (error.code === 'ENOENT') {
				return Promise.reject(error);
			}

			// Any other error: check if folder exists and
			// return normally in that case if its a folder
			try {
				const fileStat = await stat(path);
				if (!fileStat.isDirectory()) {
					return Promise.reject(new Error(`'${path}' exists and is not a directory.`));
				}
			} catch (statError) {
				throw error; // rethrow original error
			}
		}
	};

	// stop at root
	if (path === dirname(path)) {
		return Promise.resolve();
	}

	try {
		await mkdir();
	} catch (error) {

		// Respect cancellation
		if (token && token.isCancellationRequested) {
			return Promise.resolve();
		}

		// ENOENT: a parent folder does not exist yet, continue
		// to create the parent folder and then try again.
		if (error.code === 'ENOENT') {
			await mkdirp(dirname(path), mode);

			return mkdir();
		}

		// Any other error
		return Promise.reject(error);
	}
}

export function realcaseSync(path: string): string | null {
	const dir = dirname(path);
	if (path === dir) {	// end recursion
		return path;
	}

	const name = (basename(path) /* can be '' for windows drive letters */ || path).toLowerCase();
	try {
		const entries = readdirSync(dir);
		const found = entries.filter(e => e.toLowerCase() === name);	// use a case insensitive search
		if (found.length === 1) {
			// on a case sensitive filesystem we cannot determine here, whether the file exists or not, hence we need the 'file exists' precondition
			const prefix = realcaseSync(dir);   // recurse
			if (prefix) {
				return join(prefix, found[0]);
			}
		} else if (found.length > 1) {
			// must be a case sensitive $filesystem
			const ix = found.indexOf(name);
			if (ix >= 0) {	// case sensitive
				const prefix = realcaseSync(dir);   // recurse
				if (prefix) {
					return join(prefix, found[ix]);
				}
			}
		}
	} catch (error) {
		// silently ignore error
	}

	return null;
}

	download(from: URI, to: string = path.join(tmpdir(), generateUuid())): Promise<string> {
		from = this.getUriTransformer().transformOutgoingURI(from);
		const dirName = path.dirname(to);
		let out: fs.WriteStream;
		return new Promise<string>((c, e) => {
			return mkdirp(dirName)
				.then(() => {
					out = fs.createWriteStream(to);
					out.once('close', () => c(to));
					out.once('error', e);
					const uploadStream = this.channel.listen<UploadResponse>('upload', from);
					const disposable = uploadStream(result => {
						if (result === undefined) {
							disposable.dispose();
							out.end(() => c(to));
						} else if (Buffer.isBuffer(result)) {
							out.write(result);
						} else if (typeof result === 'string') {
							disposable.dispose();
							out.end(() => e(result));
						}
					});
				});
		});
	}

function extractEntry(stream: Readable, fileName: string, mode: number, targetPath: string, options: IOptions, token: CancellationToken): Promise<void> {
	const dirName = path.dirname(fileName);
	const targetDirName = path.join(targetPath, dirName);
	if (targetDirName.indexOf(targetPath) !== 0) {
		return Promise.reject(new Error(nls.localize('invalid file', "Error extracting {0}. Invalid file.", fileName)));
	}
	const targetFileName = path.join(targetPath, fileName);

	let istream: WriteStream;

	Event.once(token.onCancellationRequested)(() => {
		if (istream) {
			istream.destroy();
		}
	});

	return Promise.resolve(mkdirp(targetDirName, undefined, token)).then(() => new Promise<void>((c, e) => {
		if (token.isCancellationRequested) {
			return;
		}

		try {
			istream = createWriteStream(targetFileName, { mode });
			istream.once('close', () => c());
			istream.once('error', e);
			stream.once('error', e);
			stream.pipe(istream);
		} catch (error) {
			e(error);
		}
	}));
}

	test('resolve', async () => {
		await pfs.mkdirp(path.dirname(fooBackupPath));
		fs.writeFileSync(fooBackupPath, 'foo');
		const model = new BackupFilesModel(service.fileService);

		const resolvedModel = await model.resolve(URI.file(workspaceBackupPath));
		assert.equal(resolvedModel.has(URI.file(fooBackupPath)), true);
	});

	test('copyFile - same file should throw', async () => {
		const source = await service.resolveFile(URI.file(join(testDir, 'index.html')));
		const targetParent = URI.file(dirname(source.resource.fsPath));
		const target = targetParent.with({ path: posix.join(targetParent.path, posix.basename(source.resource.path)) });

		try {
			await service.copyFile(source.resource, target, true);
		} catch (error) {
			assert.ok(error);
		}
	});

	test('resolve', () => {
		return pfs.mkdirp(path.dirname(fooBackupPath)).then(() => {
			fs.writeFileSync(fooBackupPath, 'foo');

			const model = new BackupFilesModel();

			return model.resolve(workspaceBackupPath).then(model => {
				assert.equal(model.has(Uri.file(fooBackupPath)), true);
			});
		});
	});