* @param workingDirectory working directory
     * @param stdout stdout
     * @param stderr stderr
     * @return return code
     */
    public int doMain(String[] args, String workingDirectory, PrintStream stdout, PrintStream stderr) {
        PrintStream oldout = System.out;
        PrintStream olderr = System.err;

        final Set<String> realms;
        if (classWorld != null) {

		case *rsa.PrivateKey:
			return &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(k)}
		case *ecdsa.PrivateKey:
			b, err := x509.MarshalECPrivateKey(k)
			if err != nil {
				fmt.Fprintf(os.Stderr, "Unable to marshal ECDSA private key: %v", err)
				os.Exit(2)
			}
			return &pem.Block{Type: "EC PRIVATE KEY", Bytes: b}
		default:
			return nil
		}
	}

	var priv any
	var err error

		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrServerNotInitialized), r.URL)
		return
	}

	cred, owner, s3Err := validateAdminSignature(ctx, r, "")
	if s3Err != ErrNone {
		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(s3Err), r.URL)
		return
	}

	checkDenyOnly := name == cred.AccessKey

	if !globalIAMSys.IsAllowed(policy.Args{
		AccountName:     cred.AccessKey,

	errCh := make(chan error, 1)
	go func() {
		sentErr := false
		sendErr := func(err error) {
			if !sentErr {
				select {
				case results <- itemOrErr[ObjectInfo]{Err: err}:
					sentErr = true
				case <-parentCtx.Done():
				}
			}
		}
		defer func() {
			select {
			case <-ctx.Done():
				sendErr(ctx.Err())
			default:
			}
			xioutil.SafeClose(results)

	readQuorum, writeQuorum, err := objectQuorumFromMeta(ctx, metaArr, errs, er.defaultParityCount)
	if err != nil {
		if shouldCheckForDangling(err, errs, srcBucket) {
			_, derr := er.deleteIfDangling(context.Background(), srcBucket, srcObject, metaArr, errs, nil, srcOpts)
			if derr == nil {
				if srcOpts.VersionID != "" {
					err = errFileVersionNotFound
				} else {
					err = errFileNotFound
				}
			}
		}

			z, err := OpenReader(test.file)
			if err != nil {
				t.Fatal(err)
			}
			var files []string
			sawErr := false
			err = fs.WalkDir(z, ".", func(path string, d fs.DirEntry, err error) error {
				if err != nil {
					if !test.wantErr {
						t.Errorf("%s: %v", path, err)
					}
					sawErr = true
					return nil
				}
				files = append(files, path)
				return nil
			})

		}
	}()
	b.Read(make([]byte, 100))
}

var errFake = errors.New("fake error")

type errorThenGoodReader struct {
	didErr bool
	nread  int
}

func (r *errorThenGoodReader) Read(p []byte) (int, error) {
	r.nread++
	if !r.didErr {
		r.didErr = true
		return 0, errFake
	}
	return len(p), nil
}

func TestReaderClearError(t *testing.T) {
	r := &errorThenGoodReader{}

github.com/go-logr/logr v1.4.2 h1:6pFjapn8bFcIbiKo3XT4j/BhANplGihG6tvd+8rYgrY=
github.com/go-logr/logr v1.4.2/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
github.com/go-ole/go-ole v1.2.6/go.mod h1:pprOEPIfldk/42T2oK7lQ4v4JSDwmV0As9GaiUsvbm0=