qemush : modification du flot d'exécution de la commande edit

bin/qemush

@@ -113,14 +113,16 @@ public_diskls() {
 
 # Edit a virtual machine entrypoint with a text editor
 public_edit() {
-    cd || return
     local file="launchers/${1}"
     # I don't even know why shellcheck gives me this warning
     # shellcheck disable=2209
     [ -z "$EDITOR" ] && EDITOR=vi
 
-    "$EDITOR" "$file"
-    [ -f "$file" ] && exec chmod u+x "$file"
+    set -e
+    cd
+    touch -- "$file"
+    chmod u+x -- "$file"
+    exec "$EDITOR" -- "$file"
 }
 
 # Delete a virtual machine entrypoint