GODT-1523: Reduce unnecessary shell executions. Inspired by @kortschak.

- check opened file descriptors
- detection of darwin version
- detection of apple interface color theme
- test for update sync (copy files)
- replace exec with execabs

cmd/launcher/main.go

@@ -20,7 +20,6 @@ package main
 import (
 	"fmt"
 	"os"
-	"os/exec"
 	"path/filepath"
 	"runtime"
 
@@ -36,6 +35,7 @@ import (
 	"github.com/ProtonMail/proton-bridge/v2/internal/versioner"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
+	"golang.org/x/sys/execabs"
 )
 
 const (
@@ -98,7 +98,7 @@ func main() { //nolint:funlen
 		logrus.WithError(err).Fatal("Failed to determine path to launcher")
 	}
 
-	cmd := exec.Command(exe, appendLauncherPath(launcher, os.Args[1:])...) //nolint:gosec
+	cmd := execabs.Command(exe, appendLauncherPath(launcher, os.Args[1:])...) //nolint:gosec
 
 	cmd.Stdin = os.Stdin
 	cmd.Stdout = os.Stdout