Add updates module and fix issues

updates/uptool/scan.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/Safing/portmaster/updates"
+	"github.com/spf13/cobra"
+)
+
+func init() {
+	rootCmd.AddCommand(scanCmd)
+}
+
+var scanCmd = &cobra.Command{
+	Use:   "scan",
+	Short: "Scan the current directory and print the result",
+	RunE:  scan,
+}
+
+func scan(cmd *cobra.Command, args []string) error {
+
+	latest, err := updates.ScanForLatest(".", true)
+	if err != nil {
+		return err
+	}
+
+	data, err := json.MarshalIndent(latest, "", " ")
+	if err != nil {
+		return err
+	}
+
+	fmt.Println(string(data))
+	return nil
+}