--interactive on MS Windows: Exit with error if winpty is missing #217

x11docker

@@ -440,8 +440,9 @@ ${Colredbg}x11docker ERROR:${Colnorm} $Message
 }
 logentry() {                    # write into logfile
   [ -e "$Logfile" ] && {
-    [ "$Logmessages" ] && echo "$Logmessages" >>$Messagelogfile 2>/dev/null && Logmessages=""
+    [ -n "$Logmessages" ] && echo "$Logmessages" >>$Messagelogfile 2>/dev/null && Logmessages=""
     echo "$*" >>$Messagelogfile 2>/dev/null 
+    :
   } || Logmessages="$Logmessages
 $*" 
 }
@@ -6762,6 +6763,16 @@ check_option_interferences() {  # check multiple option interferences, change se
   # --interactive
   case $Interactive in
     yes)
+      case $Winsubsystem in
+        MSYS2|CYGWIN|WSL1)
+          Winpty="$(command -v winpty)"
+          Winpty="$(escapestring "$Winpty")"
+          [ "$Winpty" ] || error "Option -i, --interactive: On MS Windows you need 'winpty'
+  to run x11docker in interactive mode. MSYS2 provides winpty as a package.
+  On Cygwin it can be compiled from source. WSL1 isn't supported yet.
+  WSL2 might work, but is not tested yet."
+        ;;
+      esac
       [ "$Forwardstdin" = "yes" ] && {
         note "You cannot use --stdin along with --interactive.
   Fallback: Disabling option --stdin."
@@ -6775,20 +6786,9 @@ check_option_interferences() {  # check multiple option interferences, change se
       }
       case $Initsystem in
         systemd|openrc|runit|sysvinit)  note "Option --interactive: Interactive mode with option
-  --init=$Initsystem is not well integrated yet. Shells do not have job
-  control, and CTRL-C can behave different than expected." ;;
+  --init=$Initsystem is not well integrated yet. 
+  Shells do not have job control and CTRL-C can behave different than expected." ;;
       esac
-      [ "$Winsubsystem" ] && {
-        Winpty="$(command -v winpty)"
-        Winpty="$(escapestring "$Winpty")"
-        [ "$Winpty" ] || {
-          note "Option -i, --interactive: On MS Windows you need 'winpty'
-  to run x11docker in interactive mode. MSYS2 provides winpty as a package.
-  On Cygwin it can be compiled from source. WSL isn't supported yet.
-  Fallback: disabling option --interactive."
-          Interactive="no"
-        }
-      }
     ;;
   esac
   [ "$Interactive" = "yes" ] && Showcontaineroutput="no"