nvidia-container-toolkit/cmd/nvidia-ctk/main.go

/**
# Copyright (c) 2021, NVIDIA CORPORATION.  All rights reserved.
#
# Licensed 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.
**/

package main

import (
	"os"

	log "github.com/sirupsen/logrus"
	cli "github.com/urfave/cli/v2"
)

var version string

var logger = log.New()

// config defines the options that can be set for the CLI through config files,
// environment variables, or command line flags
type config struct {
	// Debug indicates whether the CLI is started in "debug" mode
	Debug bool
}

func main() {
	// Create a config struct to hold the parsed environment variables or command line flags
	config := config{}

	// Create the top-level CLI
	c := cli.NewApp()
	c.UseShortOptionHandling = true
	c.EnableBashCompletion = true
	c.Usage = "Tools to configure the NVIDIA Container Toolkit"
	c.Version = version

	// Setup the flags for this command
	c.Flags = []cli.Flag{
		&cli.BoolFlag{
			Name:        "debug",
			Aliases:     []string{"d"},
			Usage:       "Enable debug-level logging",
			Destination: &config.Debug,
			EnvVars:     []string{"NVIDIA_CTK_DEBUG"},
		},
	}

	// Set log-level for all subcommands
	c.Before = func(c *cli.Context) error {
		logLevel := log.InfoLevel
		if config.Debug {
			logLevel = log.DebugLevel
		}

		logger.SetLevel(logLevel)
		return nil
	}

	// Define the subcommands
	c.Commands = []*cli.Command{}

	// Run the CLI
	err := c.Run(os.Args)
	if err != nil {
		log.Errorf("%v", err)
		log.Exit(1)
	}
}