fix lint errors

internal/adapters/data/file/ssh_config_manager.go

@@ -43,7 +43,9 @@ func (m *sshConfigManager) parseServers() ([]domain.Server, error) {
 		}
 		return nil, err
 	}
-	defer file.Close()
+	defer func() {
+		_ = file.Close()
+	}()
 
 	parser := &SSHConfigParser{}
 	return parser.Parse(file)
@@ -58,7 +60,9 @@ func (m *sshConfigManager) writeServers(servers []domain.Server) error {
 	if err != nil {
 		return err
 	}
-	defer file.Close()
+	defer func() {
+		_ = file.Close()
+	}()
 
 	writer := &SSHConfigWriter{}
 	return writer.Write(file, servers)

internal/adapters/data/file/writer.go

@@ -26,36 +26,55 @@ type SSHConfigWriter struct{}
 
 func (w *SSHConfigWriter) Write(writer io.Writer, servers []domain.Server) error {
 	bufWriter := bufio.NewWriter(writer)
-	defer bufWriter.Flush()
+	defer func() {
+		_ = bufWriter.Flush()
+	}()
 
-	fmt.Fprintf(bufWriter, "%s\n\n", ManagedByComment)
+	if _, err := fmt.Fprintf(bufWriter, "%s\n\n", ManagedByComment); err != nil {
+		return err
+	}
 
 	for i, server := range servers {
 		if i > 0 {
-			bufWriter.WriteString("\n")
+			if _, err := bufWriter.WriteString("\n"); err != nil {
+				return err
+			}
+		}
+		if err := w.writeServer(bufWriter, server); err != nil {
+			return err
 		}
-		w.writeServer(bufWriter, server)
 	}
 
 	return nil
 }
 
-func (w *SSHConfigWriter) writeServer(writer *bufio.Writer, server domain.Server) {
-	fmt.Fprintf(writer, "Host %s\n", server.Alias)
+func (w *SSHConfigWriter) writeServer(writer *bufio.Writer, server domain.Server) error {
+	if _, err := fmt.Fprintf(writer, "Host %s\n", server.Alias); err != nil {
+		return err
+	}
 
 	if server.Host != "" {
-		fmt.Fprintf(writer, "    HostName %s\n", server.Host)
+		if _, err := fmt.Fprintf(writer, "    HostName %s\n", server.Host); err != nil {
+			return err
+		}
 	}
 
 	if server.User != "" {
-		fmt.Fprintf(writer, "    User %s\n", server.User)
+		if _, err := fmt.Fprintf(writer, "    User %s\n", server.User); err != nil {
+			return err
+		}
 	}
 
 	if server.Port != 0 && server.Port != DefaultPort {
-		fmt.Fprintf(writer, "    Port %d\n", server.Port)
+		if _, err := fmt.Fprintf(writer, "    Port %d\n", server.Port); err != nil {
+			return err
+		}
 	}
 
 	if server.Key != "" {
-		fmt.Fprintf(writer, "    IdentityFile %s\n", server.Key)
+		if _, err := fmt.Fprintf(writer, "    IdentityFile %s\n", server.Key); err != nil {
+			return err
+		}
 	}
+	return nil
 }