Carry custom status code for commands to os.Exit()

cmd/cobra.go

@@ -1,6 +1,8 @@
 package caddycmd
 
 import (
+	"fmt"
+
 	"github.com/spf13/cobra"
 )
 
@@ -123,7 +125,24 @@ func caddyCmdToCobra(caddyCmd Command) *cobra.Command {
 // in a cobra command's RunE field.
 func WrapCommandFuncForCobra(f CommandFunc) func(cmd *cobra.Command, _ []string) error {
 	return func(cmd *cobra.Command, _ []string) error {
-		_, err := f(Flags{cmd.Flags()})
+		status, err := f(Flags{cmd.Flags()})
+		if status > 1 {
+			cmd.SilenceErrors = true
+			return &exitError{ExitCode: status, Err: err}
+		}
 		return err
 	}
 }
+
+// exitError carries the exit code from CommandFunc to Main()
+type exitError struct {
+	ExitCode int
+	Err      error
+}
+
+func (e *exitError) Error() string {
+	if e.Err == nil {
+		return fmt.Sprintf("exiting with status %d", e.ExitCode)
+	}
+	return e.Err.Error()
+}

cmd/main.go

@@ -17,6 +17,7 @@ package caddycmd
 import (
 	"bufio"
 	"bytes"
+	"errors"
 	"flag"
 	"fmt"
 	"io"
@@ -63,6 +64,10 @@ func Main() {
 	}
 
 	if err := rootCmd.Execute(); err != nil {
+		var exitError *exitError
+		if errors.As(err, &exitError) {
+			os.Exit(exitError.ExitCode)
+		}
 		os.Exit(1)
 	}
 }