Use more appropriate directory folders for config.ini

Author: cmaglie

config.go

@@ -0,0 +1,52 @@
+// Copyright 2023 Arduino SA
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published
+// by the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/arduino/go-paths-helper"
+)
+
+// getDefaultArduinoCreateConfigDir returns the full path to the default arduino create agent data directory
+func getDefaultArduinoCreateConfigDir() (*paths.Path, error) {
+	// UserConfigDir returns the default root directory to use
+	// for user-specific configuration data. Users should create
+	// their own application-specific subdirectory within this
+	// one and use that.
+	//
+	// On Unix systems, it returns $XDG_CONFIG_HOME as specified by
+	// https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
+	// if non-empty, else $HOME/.config.
+	//
+	// On Darwin, it returns $HOME/Library/Application Support.
+	// On Windows, it returns %AppData%.
+	// On Plan 9, it returns $home/lib.
+	//
+	// If the location cannot be determined (for example, $HOME
+	// is not defined), then it will return an error.
+	configDir, err := os.UserConfigDir()
+	if err != nil {
+		return nil, err
+	}
+
+	agentConfigDir := paths.New(configDir, "ArduinoCreateAgent")
+	if err := agentConfigDir.MkdirAll(); err != nil {
+		return nil, fmt.Errorf("cannot create config dir: %s", err)
+	}
+	return agentConfigDir, nil
+}

main.go

@@ -24,7 +24,6 @@ import (
 	"flag"
 	"io/ioutil"
 	"os"
-	"os/user"
 	"runtime"
 	"runtime/debug"
 	"strconv"
@@ -192,9 +191,7 @@ func loop() {
 	src, _ := os.Executable()
 	srcPath := paths.New(src)  // The path of the agent's binary
 	srcDir := srcPath.Parent() // The directory of the agent's binary
-	usr, _ := user.Current()
-	usrDir := paths.New(usr.HomeDir) // The user folder, on linux/macos /home/<usr>/
-	agentDir := usrDir.Join(".arduino-create")
+	agentDir, err := getDefaultArduinoCreateConfigDir()
 
 	// Instantiate Tools
 	Tools = tools.Tools{