cert-manager/hack/release/pkg/util/exec.go

package util

import (
	"fmt"
	"os"
	"os/exec"

	"github.com/go-logr/logr"
	logf "github.com/jetstack/cert-manager/hack/release/pkg/log"
)

func RunE(log logr.Logger, cmd *exec.Cmd) error {
	// debug mode logs directly to stdout/stderr
	if log.V(logf.LogLevelTrace).Enabled() {
		cmd.Stdout = os.Stdout
		cmd.Stderr = os.Stderr

		log = log.WithValues("command", append([]string{cmd.Path}, cmd.Args[1:]...))
		log.V(logf.LogLevelDebug).Info("executing command with default stdout/stderr")
		err := cmd.Run()
		if err != nil {
			return fmt.Errorf("failed to execute command: %v", err)
		}

		return nil
	}

	_, err := RunPrintCombined(log, cmd)
	return err
}

// RunPrintCombined will run the given command, capturing its output using CombinedOutput.
// If the command execution fails, the command output will be logged to the loggers
// underlying output Writer.
// This function will return the combined output bytes on both failure and success.
func RunPrintCombined(log logr.Logger, cmd *exec.Cmd) ([]byte, error) {
	log = log.WithValues("command", append([]string{cmd.Path}, cmd.Args[1:]...))
	log.V(logf.LogLevelDebug).Info("executing command")

	out, err := cmd.CombinedOutput()
	if err != nil {
		logf.Output.Write(out)
		if len(out) == 0 {
			logf.Output.Write([]byte("(no output)"))
		}
		return out, fmt.Errorf("failed to execute command: %v", err)
	}
	return out, nil
}