fix linter errors

cmd/root.go

@@ -1,7 +1,6 @@
 package cmd
 
 import (
-	"fmt"
 	"github.com/containrrr/watchtower/actions"
 	"github.com/containrrr/watchtower/container"
 	"github.com/containrrr/watchtower/internal/flags"
@@ -17,6 +16,8 @@ import (
 	"github.com/spf13/cobra"
 )
 
+// DockerAPIMinVersion is the minimum version of the docker api required to
+// use watchtower
 const DockerAPIMinVersion string = "1.24"
 
 var (
@@ -48,13 +49,14 @@ func init() {
 	flags.RegisterNotificationFlags(rootCmd)
 }
 
+// Execute the root func and exit in case of errors
 func Execute() {
 	if err := rootCmd.Execute(); err != nil {
-		fmt.Println(err)
-		os.Exit(1)
+		log.Fatal(err)
 	}
 }
 
+// PreRun is a lifecycle hook that runs before the command is executed.
 func PreRun(cmd *cobra.Command, args []string) {
 	f := cmd.PersistentFlags()
 
@@ -99,6 +101,7 @@ func PreRun(cmd *cobra.Command, args []string) {
 	notifier = notifications.NewNotifier(cmd)
 }
 
+// Run is the main execution flow of the command
 func Run(c *cobra.Command, names []string) {
 	filter := container.BuildFilter(names, enableLabel)
 	runOnce, _ := c.PersistentFlags().GetBool("run-once")

internal/flags/flags.go

@@ -8,12 +8,14 @@ import (
 	"time"
 )
 
+// RegisterDockerFlags that are used directly by the docker api client
 func RegisterDockerFlags(rootCmd *cobra.Command) {
 	flags := rootCmd.PersistentFlags()
 	flags.StringP("host", "H", viper.GetString("DOCKER_HOST"), "daemon socket to connect to")
 	flags.BoolP("tlsverify", "v", viper.GetBool("DOCKER_TLS_VERIFY"), "use TLS and verify the remote")
 }
 
+// RegisterSystemFlags that are used by watchtower to modify the program flow
 func RegisterSystemFlags(rootCmd *cobra.Command) {
 	flags := rootCmd.PersistentFlags()
 	flags.IntP(
@@ -82,6 +84,7 @@ func RegisterSystemFlags(rootCmd *cobra.Command) {
 		"Will also include created and exited containers")
 }
 
+// RegisterNotificationFlags that are used by watchtower to send notifications
 func RegisterNotificationFlags(rootCmd *cobra.Command) {
 	flags := rootCmd.PersistentFlags()
 
@@ -185,6 +188,7 @@ Should only be used for testing.
 		"The MSTeams notifier will try to extract log entry fields as MSTeams message facts")
 }
 
+// SetDefaults provides default values for environment variables
 func SetDefaults() {
 	viper.AutomaticEnv()
 	viper.SetDefault("DOCKER_HOST", "unix:///var/run/docker.sock")
@@ -196,7 +200,7 @@ func SetDefaults() {
 	viper.SetDefault("WATCHTOWER_NOTIFICATION_SLACK_IDENTIFIER", "watchtower")
 }
 
-// envConfig translates the command-line options into environment variables
+// EnvConfig translates the command-line options into environment variables
 // that will initialize the api client
 func EnvConfig(cmd *cobra.Command, dockerAPIMinVersion string) error {
 	var err error
@@ -223,6 +227,7 @@ func EnvConfig(cmd *cobra.Command, dockerAPIMinVersion string) error {
 	return nil
 }
 
+// ReadFlags reads common flags used in the main program flow of watchtower
 func ReadFlags(cmd *cobra.Command) (bool, bool, bool, time.Duration) {
 	flags := cmd.PersistentFlags()
 

notifications/slack.go

@@ -17,19 +17,19 @@ type slackTypeNotifier struct {
 func newSlackNotifier(c *cobra.Command, acceptedLogLevels []log.Level) typeNotifier {
 	flags := c.PersistentFlags()
 
-	hookUrl,  _ := flags.GetString("notification-slack-hook-url")
+	hookURL,  _ := flags.GetString("notification-slack-hook-url")
 	userName, _ := flags.GetString("notification-slack-identifier")
 	channel,  _ := flags.GetString("notification-slack-channel")
 	emoji,    _ := flags.GetString("notification-slack-icon-emoji")
-	iconUrl,  _ := flags.GetString("notification-slack-icon-url")
+	iconURL,  _ := flags.GetString("notification-slack-icon-url")
 
 	n := &slackTypeNotifier{
 		SlackrusHook: slackrus.SlackrusHook{
-			HookURL:        hookUrl,
+			HookURL:        hookURL,
 			Username:       userName,
 			Channel:        channel,
 			IconEmoji:      emoji,
-			IconURL:        iconUrl,
+			IconURL:        iconURL,
 			AcceptedLevels: acceptedLogLevels,
 		},
 	}