use different lock files for various users

main.go

@@ -373,7 +373,9 @@ func main() {
 	// Unless we are in autohide/resident mode, we probably want the same key/mouse binding to turn the dock off.
 	// Since v0.2 we can't just send SIGKILL if running instance found. We'll send SIGUSR1 instead.
 	// If it's running with `-r` or `-d` flag, it'll show the window. If not - it will die.
-	lockFilePath := fmt.Sprintf("%s/nwg-dock.lock", tempDir())
+
+	// Use md5-hashed $USER name to create unique lock files for multiple users
+	lockFilePath := fmt.Sprintf("%s/nwg-dock-%s.lock", tempDir(), md5Hash(os.Getenv("USER")))
 	lockFile, err := singleinstance.CreateLockFile(lockFilePath)
 	if err != nil {
 		pid, err := readTextFile(lockFilePath)

tools.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"crypto/md5"
+	"encoding/hex"
 	"errors"
 	"fmt"
 	"github.com/gotk3/gotk3/gdk"
@@ -841,3 +843,8 @@ func isCommand(command string) bool {
 	cmd := strings.Fields(command)[0]
 	return getCommandOutput(fmt.Sprintf("command -v %s ", cmd)) != ""
 }
+
+func md5Hash(text string) string {
+	hash := md5.Sum([]byte(text))
+	return hex.EncodeToString(hash[:])
+}