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flags.go
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flags.go
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// Copyright 2018 Anapaya Systems
//
// 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 env
import (
"flag"
"fmt"
"os"
"github.com/scionproto/scion/go/lib/config"
)
var (
configFile string
helpConfig bool
version bool
)
// AddFlags adds the config and sample flags.
func AddFlags() {
flag.StringVar(&configFile, "config", "", "TOML config file.")
flag.BoolVar(&helpConfig, "help-config", false, "Output sample commented config file.")
flag.BoolVar(&version, "version", false, "Output version information and exit.")
}
// ConfigFile returns the config file path passed through the flag.
func ConfigFile() string {
return configFile
}
// Usage outputs run-time help to stdout.
func Usage() {
fmt.Printf("Usage: %s -config <FILE> \n or: %s -help-config\n\nArguments:\n",
os.Args[0], os.Args[0])
flag.CommandLine.SetOutput(os.Stdout)
flag.PrintDefaults()
}
// CheckFlags checks whether the config or help-config flags have been set. In case the
// help-config flag is set, the config flag is ignored and a commented sample config
// is written to stdout.
//
// The first return value is the return code of the program. The second value
// indicates whether the program can continue with its execution or should exit.
func CheckFlags(sampler config.Sampler) (int, bool) {
if helpConfig {
sampler.Sample(os.Stdout, nil, nil)
return 0, false
}
if version {
fmt.Printf(VersionInfo())
return 0, false
}
if configFile == "" {
fmt.Fprintln(os.Stderr, "Err: Missing config file")
flag.Usage()
return 1, false
}
return 0, true
}