chore(errors): Better error management

We must remove all "Fatal" calls and use errors instead, to be returned
and managed globally.
This is the first step, but it is, at this time, a real problem. Tests
are complicated without this.

generator/configMap.go

@@ -1,6 +1,7 @@
 package generator
 
 import (
+	"fmt"
 	"katenary/generator/labels"
 	"katenary/generator/labels/labelStructs"
 	"katenary/utils"
@@ -141,7 +142,7 @@ func NewConfigMapFromDirectory(service types.ServiceConfig, appName, path string
 	// cumulate the path to the WorkingDir
 	path = filepath.Join(service.WorkingDir, path)
 	path = filepath.Clean(path)
-	cm.AppenddDir(path)
+	cm.AppendDir(path)
 	return cm
 }
 
@@ -160,17 +161,17 @@ func (c *ConfigMap) AddBinaryData(key string, value []byte) {
 
 // AddFile adds files from given path to the configmap. It is not recursive, to add all files in a directory,
 // you need to call this function for each subdirectory.
-func (c *ConfigMap) AppenddDir(path string) {
+func (c *ConfigMap) AppendDir(path string) error {
 	// read all files in the path and add them to the configmap
 	stat, err := os.Stat(path)
 	if err != nil {
-		log.Fatalf("Path %s does not exist\n", path)
+		return fmt.Errorf("Path %s does not exist, %w\n", path, err)
 	}
 	// recursively read all files in the path and add them to the configmap
 	if stat.IsDir() {
 		files, err := os.ReadDir(path)
 		if err != nil {
-			log.Fatal(err)
+			return err
 		}
 		for _, file := range files {
 			if file.IsDir() {
@@ -180,7 +181,7 @@ func (c *ConfigMap) AppenddDir(path string) {
 			path := filepath.Join(path, file.Name())
 			content, err := os.ReadFile(path)
 			if err != nil {
-				log.Fatal(err)
+				return err
 			}
 			// remove the path from the file
 			filename := filepath.Base(path)
@@ -195,7 +196,7 @@ func (c *ConfigMap) AppenddDir(path string) {
 		// add the file to the configmap
 		content, err := os.ReadFile(path)
 		if err != nil {
-			log.Fatal(err)
+			return err
 		}
 		filename := filepath.Base(path)
 		if utf8.Valid(content) {
@@ -204,20 +205,21 @@ func (c *ConfigMap) AppenddDir(path string) {
 			c.AddBinaryData(filename, content)
 		}
 	}
+	return nil
 }
 
-func (c *ConfigMap) AppendFile(path string) {
+func (c *ConfigMap) AppendFile(path string) error {
 	// read all files in the path and add them to the configmap
 	stat, err := os.Stat(path)
 	if err != nil {
-		log.Fatalf("Path %s does not exist\n", path)
+		return fmt.Errorf("Path %s doesn not exists, %w", path, err)
 	}
 	// recursively read all files in the path and add them to the configmap
 	if !stat.IsDir() {
 		// add the file to the configmap
 		content, err := os.ReadFile(path)
 		if err != nil {
-			log.Fatal(err)
+			return err
 		}
 		if utf8.Valid(content) {
 			c.AddData(filepath.Base(path), string(content))
@@ -226,6 +228,7 @@ func (c *ConfigMap) AppendFile(path string) {
 		}
 
 	}
+	return nil
 }
 
 // Filename returns the filename of the configmap. If the configmap is used for files, the filename contains the path.