Don't swallow error raised from file exists helper method (#1019)

* Don't swallow error raised from file exists helper method

* streamline

cmd/getConfig.go

@@ -55,12 +55,20 @@ func generateConfig() error {
 	}
 
 	var customConfig io.ReadCloser
-	if piperutils.FileExists(GeneralConfig.CustomConfig) {
+	{
+		exists, e := piperutils.FileExists(GeneralConfig.CustomConfig)
+
+		if e != nil {
+			return e
+		}
+
+		if exists {
 			customConfig, err = configOptions.openFile(GeneralConfig.CustomConfig)
 			if err != nil {
 				return errors.Wrap(err, "config: open failed")
 			}
 		}
+	}
 
 	defaultConfig, paramFilter, err := defaultsAndFilters(&metadata, metadata.Metadata.Name)
 	if err != nil {

cmd/piper.go

@@ -83,7 +83,14 @@ func PrepareConfig(cmd *cobra.Command, metadata *config.StepData, stepName strin
 		var customConfig io.ReadCloser
 		var err error
 		//accept that config file and defaults cannot be loaded since both are not mandatory here
-		if piperutils.FileExists(GeneralConfig.CustomConfig) {
+		{
+			exists, e := piperutils.FileExists(GeneralConfig.CustomConfig)
+
+			if e != nil {
+				return e
+			}
+
+			if exists {
 				if customConfig, err = openFile(GeneralConfig.CustomConfig); err != nil {
 					errors.Wrapf(err, "Cannot read '%s'", GeneralConfig.CustomConfig)
 				}
@@ -91,7 +98,7 @@ func PrepareConfig(cmd *cobra.Command, metadata *config.StepData, stepName strin
 				log.Entry().Infof("Project config file '%s' does not exist. No project configuration available.", GeneralConfig.CustomConfig)
 				customConfig = nil
 			}
-
+		}
 		var defaultConfig []io.ReadCloser
 		for _, f := range GeneralConfig.DefaultConfig {
 			//ToDo: support also https as source

cmd/xsDeploy.go

@@ -113,7 +113,7 @@ func xsDeploy(XsDeployOptions xsDeployOptions) error {
 }
 
 func runXsDeploy(XsDeployOptions xsDeployOptions, s shellRunner,
-	fExists func(string) bool,
+	fExists func(string) (bool, error),
 	fCopy func(string, string) (int64, error),
 	fRemove func(string) error,
 	stdout io.Writer) error {
@@ -143,9 +143,15 @@ func runXsDeploy(XsDeployOptions xsDeployOptions, s shellRunner,
 	performLogout := mode == Deploy || (mode == BGDeploy && action != None)
 	log.Entry().Debugf("performLogin: %t, performLogout: %t", performLogin, performLogout)
 
-	if action == None && !fExists(XsDeployOptions.MtaPath) {
+	{
+		exists, e := fExists(XsDeployOptions.MtaPath)
+		if e != nil {
+			return e
+		}
+		if action == None && !exists {
 			return errors.New(fmt.Sprintf("Deployable '%s' does not exist", XsDeployOptions.MtaPath))
 		}
+	}
 
 	if action != None && len(XsDeployOptions.OperationID) == 0 {
 		return errors.New(fmt.Sprintf("OperationID was not provided. This is required for action '%s'.", action))
@@ -194,9 +200,15 @@ func runXsDeploy(XsDeployOptions xsDeployOptions, s shellRunner,
 
 	if loginErr == nil && err == nil {
 
-		if !fExists(xsSessionFile) {
+		{
+			exists, e := fExists(xsSessionFile)
+			if e != nil {
+				return e
+			}
+			if !exists {
 				return fmt.Errorf("xs session file does not exist (%s)", xsSessionFile)
 			}
+		}
 
 		copyFileFromPwdToHome(xsSessionFile, fCopy)
 

cmd/xsDeploy_test.go

@@ -33,8 +33,8 @@ func TestDeploy(t *testing.T) {
 	var copiedFiles []string
 	var removedFiles []string
 
-	fExists := func(path string) bool {
-		return path == "dummy.mtar" || path == ".xs_session"
+	fExists := func(path string) (bool, error) {
+		return path == "dummy.mtar" || path == ".xs_session", nil
 	}
 
 	fCopy := func(src, dest string) (int64, error) {

pkg/config/config.go

@@ -167,7 +167,6 @@ func (c *Config) GetStepConfig(flagValues map[string]interface{}, paramJSON stri
 			}
 		}
 	}
-
 	return stepConfig, nil
 }
 

pkg/piperutils/FileUtils.go

@@ -7,18 +7,29 @@ import (
 )
 
 // FileExists ...
-func FileExists(filename string) bool {
+func FileExists(filename string) (bool, error) {
 	info, err := os.Stat(filename)
+
 	if os.IsNotExist(err) {
-		return false
+		return false, nil
 	}
-	return !info.IsDir()
+	if err != nil {
+		return false, err
+	}
+
+	return !info.IsDir(), nil
 }
 
 // Copy ...
 func Copy(src, dst string) (int64, error) {
 
-	if !FileExists(src) {
+	exists, err := FileExists(src)
+
+	if err != nil {
+		return 0, err
+	}
+
+	if !exists {
 		return 0, errors.New("Source file '" + src + "' does not exist")
 	}