Use explicit octal prefix for file permissions

Convert legacy octal notation (0600, 0644) to modern Go style with
explicit 0o prefix (0o600, 0o644) for improved code clarity.

Author: tricktron

pkg/crc/machine/start.go

@@ -694,7 +694,7 @@ func createHost(machineConfig config.MachineConfig, preset crcPreset.Preset) err
 		if err := cluster.GenerateUserPassword(constants.GetKubeAdminPasswordPath(), "kubeadmin"); err != nil {
 			return errors.Wrap(err, "Error generating new kubeadmin password")
 		}
-		if err = os.WriteFile(constants.GetDeveloperPasswordPath(), []byte(constants.DefaultDeveloperPassword), 0600); err != nil {
+		if err = os.WriteFile(constants.GetDeveloperPasswordPath(), []byte(constants.DefaultDeveloperPassword), 0o600); err != nil {
 			return errors.Wrap(err, "Error writing developer password")
 		}
 	}
@@ -748,7 +748,7 @@ func enableEmergencyLogin(sshRunner *crcssh.Runner) error {
 	for i := range b {
 		b[i] = charset[rand.Intn(len(charset))] //nolint:gosec
 	}
-	if err := os.WriteFile(constants.PasswdFilePath, b, 0600); err != nil {
+	if err := os.WriteFile(constants.PasswdFilePath, b, 0o600); err != nil {
 		return err
 	}
 	logging.Infof("Emergency login password for core user is stored to %s", constants.PasswdFilePath)
@@ -775,7 +775,7 @@ func updateSSHKeyPair(sshRunner *crcssh.Runner) error {
 	}
 
 	logging.Info("Updating authorized keys...")
-	err = sshRunner.CopyData(publicKey, "/home/core/.ssh/authorized_keys", 0644)
+	err = sshRunner.CopyData(publicKey, "/home/core/.ssh/authorized_keys", 0o644)
 	if err != nil {
 		return err
 	}
@@ -874,10 +874,10 @@ func startMicroshift(ctx context.Context, sshRunner *crcssh.Runner, ocConfig oc.
 	if _, _, err := sshRunner.RunPrivileged("Starting microshift service", "systemctl", "start", "microshift"); err != nil {
 		return err
 	}
-	if err := sshRunner.CopyFileFromVM(fmt.Sprintf("/var/lib/microshift/resources/kubeadmin/api%s/kubeconfig", constants.ClusterDomain), constants.KubeconfigFilePath, 0600); err != nil {
+	if err := sshRunner.CopyFileFromVM(fmt.Sprintf("/var/lib/microshift/resources/kubeadmin/api%s/kubeconfig", constants.ClusterDomain), constants.KubeconfigFilePath, 0o600); err != nil {
 		return err
 	}
-	if err := sshRunner.CopyFile(constants.KubeconfigFilePath, "/opt/kubeconfig", 0644); err != nil {
+	if err := sshRunner.CopyFile(constants.KubeconfigFilePath, "/opt/kubeconfig", 0o644); err != nil {
 		return err
 	}
 
@@ -895,5 +895,5 @@ func ensurePullSecretPresentInVM(sshRunner *crcssh.Runner, pullSec cluster.PullS
 	if err != nil {
 		return err
 	}
-	return sshRunner.CopyDataPrivileged([]byte(content), "/etc/crio/openshift-pull-secret", 0600)
+	return sshRunner.CopyDataPrivileged([]byte(content), "/etc/crio/openshift-pull-secret", 0o600)
 }