nebula/cmd/nebula-service/main.go

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package main
import (
"flag"
"fmt"
"os"
"github.com/sirupsen/logrus"
"github.com/slackhq/nebula"
)
// A version string that can be set with
//
// -ldflags "-X main.Build=SOMEVERSION"
//
// at compile-time.
var Build string
func main() {
serviceFlag := flag.String("service", "", "Control the system service.")
configPath := flag.String("config", "", "Path to either a file or directory to load configuration from")
configTest := flag.Bool("test", false, "Test the config and print the end result. Non zero exit indicates a faulty config")
printVersion := flag.Bool("version", false, "Print version")
printUsage := flag.Bool("help", false, "Print command line usage")
flag.Parse()
if *printVersion {
fmt.Printf("Version: %s\n", Build)
os.Exit(0)
}
if *printUsage {
flag.Usage()
os.Exit(0)
}
if *serviceFlag != "" {
doService(configPath, configTest, Build, serviceFlag)
os.Exit(1)
}
if *configPath == "" {
fmt.Println("-config flag must be set")
flag.Usage()
os.Exit(1)
}
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l := logrus.New()
l.Out = os.Stdout
config := nebula.NewConfig(l)
err := config.Load(*configPath)
if err != nil {
fmt.Printf("failed to load config: %s", err)
os.Exit(1)
}
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c, err := nebula.Main(config, *configTest, Build, l, nil)
switch v := err.(type) {
case nebula.ContextualError:
v.Log(l)
os.Exit(1)
case error:
l.WithError(err).Error("Failed to start")
os.Exit(1)
}
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if !*configTest {
c.Start()
c.ShutdownBlock()
}
os.Exit(0)
}