Sources/XCMetricsClient/Username Reader/UsernameReader.swift

// Copyright (c) 2020 Spotify AB.
//
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

import Foundation
import XCMetricsUtils

/// Reads the username of the currently logged in user.
protocol UsernameReader {
    var userID: String? { get }
}

/// Implementation of `UsernameReader` that fetches the username with the `id` command.
class MacOSUsernameReader: UsernameReader {
    var userID: String? {
        return try? shellGetStdout("id", args: ["-un"])
    }
}