change get_chosen to find 'submenu>kenel'

changes in grub.cfg to prevent unwanted kernel upgrades

mxgrub/mxgrub

@@ -92,7 +92,13 @@ sub get_chosen {
 	my $chosen;
 	open my $p,'-|','grub-editenv','-','list' or die "$!\n";
 	while (<$p>) {
-		/^chosen=$submenu\>(.+)|^chosen=(.+)/ and return $1;
+    /^chosen=$submenu>(.+)/;
+    if (defined $1) {
+      return $1;
+    } else {
+      /^chosen=(.+)/ and return $1;
+    }
+
 	}
 	close $p or die "$!\n";
 	$? and exit 1;
@@ -187,15 +193,20 @@ if [ -e /etc/local/USB.usb ]; then
 	menuentry "mariuxUSB" --unrestricted { save_env chosen ; linux /boot/bzImage.x86_64 crashkernel=256M root=LABEL=rootusb ro ; initrd /boot/grub/initramfs.igz }
 else
 
-menuentry "$MARIUX_DEFAULT" --unrestricted { save_env chosen ; linux /boot/bzImage.x86_64 crashkernel=256M root=LABEL=root ro console=ttyS1,115200n8 console=tty0 ; initrd /boot/grub/initramfs.igz }
+menuentry "$MARIUX_DEFAULT" --id="$submenu>$MARIUX_DEFAULT" --unrestricted { save_env chosen="$submenu>$MARIUX_DEFAULT" ; linux /boot/bzImage.x86_64 crashkernel=256M root=LABEL=root ro console=ttyS1,115200n8 console=tty0 ; initrd /boot/grub/initramfs.igz }
 
 submenu "$submenu" --unrestricted {
 $kernellist
 }
-	if [ \$chosen ]; then
-		set default=\$chosen
-		unset chosen          # must be clear to get a clean value from menuentry
-	fi
+  if [ "\$chosen" = "\$default" ]; then
+    set default="$submenu>\$chosen"
+    unset chosen
+  fi
+
+  if [ \$chosen ]; then
+    set default=\$chosen
+    unset chosen          # must be clear to get a clean value from menuentry
+  fi
 fi
 EOF