feat(influxd): refactor run command to use cli.Program to respect con…

…fig file

CHANGELOG.md

@@ -13,6 +13,7 @@
 1. [18595](https://github.com/influxdata/influxdb/pull/18595): Add ability to skip resources in a template by kind or by metadata.name
 1. [18600](https://github.com/influxdata/influxdb/pull/18600): Extend influx apply with resource filter capabilities
 1. [18601](https://github.com/influxdata/influxdb/pull/18601): Provide active config  running influx config without args
+1. [18606](https://github.com/influxdata/influxdb/pull/18606): Enable influxd binary to look for a config file on startup
 
 ## v2.0.0-beta.12 [2020-06-12]
 

cmd/influxd/launcher/launcher.go

@@ -87,19 +87,19 @@ const (
 // NewCommand creates the command to run influxdb.
 func NewCommand() *cobra.Command {
 	l := NewLauncher()
-	cmd := &cobra.Command{
-		Use:   "run",
-		Short: "Start the influxd server (default)",
-		Run: func(cmd *cobra.Command, args []string) {
+
+	prog := cli.Program{
+		Name: "run",
+		Opts: launcherOpts(l),
+		Run: func() error {
 			// exit with SIGINT and SIGTERM
 			ctx := context.Background()
 			ctx = signals.WithStandardSignals(ctx)
 
 			if err := l.run(ctx); err != nil {
-				fmt.Fprintln(os.Stderr, err)
-				os.Exit(1)
+				return err
 			} else if !l.Running() {
-				os.Exit(1)
+				return errors.New("the daemon is already running")
 			}
 
 			var wg sync.WaitGroup
@@ -120,23 +120,37 @@ func NewCommand() *cobra.Command {
 			defer cancel()
 			l.Shutdown(ctx)
 			wg.Wait()
+
+			return nil
 		},
 	}
 
-	buildLauncherCommand(l, cmd)
+	cmd := cli.NewCommand(&prog)
+	cmd.Long = `
+	Start up the daemon configured with flags/env vars/config file.
 
+	The order of precedence for config options are as follows (1 highest, 3 lowest):
+		1. flags
+		2. env vars
+		3. config file
+
+	A config file can be provided via the INFLUXD_CONFIG_FILE env var. If a file is
+	not provided via an env var, influxd will look in the current directory for a
+	config.yaml file. If one does not exist, then it will continue unchanged.
+`
+	cmd.AddCommand(inspect.NewCommand())
 	return cmd
 }
 
 var vaultConfig vault.Config
 
-func buildLauncherCommand(l *Launcher, cmd *cobra.Command) {
+func launcherOpts(l *Launcher) []cli.Opt {
 	dir, err := fs.InfluxDir()
 	if err != nil {
 		panic(fmt.Errorf("failed to determine influx directory: %v", err))
 	}
 
-	opts := []cli.Opt{
+	return []cli.Opt{
 		{
 			DestP:   &l.logLevel,
 			Flag:    "log-level",
@@ -312,7 +326,10 @@ func buildLauncherCommand(l *Launcher, cmd *cobra.Command) {
 			Desc:  "feature flag overrides",
 		},
 	}
-	cli.BindOptions(cmd, opts)
+}
+
+func buildLauncherCommand(l *Launcher, cmd *cobra.Command) {
+	cli.BindOptions(cmd, launcherOpts(l))
 	cmd.AddCommand(inspect.NewCommand())
 }