refactor: unify error handling

config/certs.go

@@ -50,13 +50,13 @@ func generateSelfSignedTLSCertificate() error {
 
 	derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &privateKey.PublicKey, privateKey)
 	if err != nil {
-		return err
+		return fmt.Errorf("Failed to create new x509 certificate: %v", err)
 	}
 
 	cert := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
 	key, err := x509.MarshalECPrivateKey(privateKey)
 	if err != nil {
-		return err
+		return fmt.Errorf("Failed to marshal EC private key: %v", err)
 	}
 	keyPEM := pem.EncodeToMemory(&pem.Block{Type: "EC PRIVATE KEY", Bytes: key})
 
@@ -77,17 +77,17 @@ func loadOrGenerateTLSCertificate() error {
 
 	_, err := tls.LoadX509KeyPair(pathTLSCertFile, pathTLSKeyFile)
 	if err != nil {
-		return fmt.Errorf("Error: Failed to load TLS certificate or key: %w", err)
+		return fmt.Errorf("Failed to load TLS certificate or key: %w", err)
 	}
 
 	certData, err := os.ReadFile(pathTLSCertFile)
 	if err != nil {
-		return fmt.Errorf("Error: Failed to read TLS certificate file: %w", err)
+		return fmt.Errorf("Failed to read TLS certificate file: %w", err)
 	}
 
 	keyData, err := os.ReadFile(pathTLSKeyFile)
 	if err != nil {
-		return fmt.Errorf("Error: Failed to read TLS key file: %w", err)
+		return fmt.Errorf("Failed to read TLS key file: %w", err)
 	}
 
 	selfSignedTLSCertificate = certData

config/config.go

@@ -2,7 +2,6 @@ package config
 
 import (
 	"fmt"
-	"os"
 )
 
 const DefaultBasicAuthUsername string = "ablage"
@@ -14,22 +13,22 @@ const VersionString string = "1.1"
 
 var randomBasicAuthPassword string = generateRandomPassword()
 
-func Init() {
+func Init() error {
 	err := gatherDefaultPaths()
 	if err != nil {
-		panic(err)
+		return err
 	}
 
 	parseFlags()
 
 	if GetReadonlyMode() && GetSinkholeMode() {
-		fmt.Println("Error: Cannot enable both readonly and sinkhole modes at the same time.")
-		os.Exit(1)
+		return fmt.Errorf("Cannot enable both readonly and sinkhole modes at the same time.")
 	}
 
 	err = loadOrGenerateTLSCertificate()
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "%v\n", err)
-		os.Exit(1)
+		return err
 	}
+
+	return nil
 }

config/filesystem.go

@@ -12,7 +12,7 @@ var defaultPathUploadFolder string = ""
 func gatherDefaultPaths() error {
 	execPath, err := os.Executable()
 	if err != nil {
-		return fmt.Errorf("[Error] Could not determine binary path: %v", err)
+		return fmt.Errorf("Could not determine binary path: %v", err)
 	}
 
 	defaultPathDataFolder = filepath.Join(filepath.Dir(execPath), DefaultNameDataFolder)