From: Henrik.Carlqvist@deadspam.com   
      
   On Sun, 28 Aug 2022 09:39:32 +0000, Henrik Carlqvist wrote:   
   > When qemu is started with -snapshot, no changes are saved to the disk   
   > image file,   
      
   Also, if you make the disk image file readonly with something like   
      
   chmod a-w Slackware_reference.img   
      
   qemu will refuse to start without the -snapshot flag. With such a routine   
   you can trust that the image is in a reference state.   
      
   At some few occations you might want to do   
      
   chmod u+w Slackware_reference.img   
      
   and start qemu without -snapshot to apply the latest patches packages.   
   Before doing such a thing you might want to create a backup of the image   
   file. Once the installation is updated, be sure to do a clean shutdown   
   and then make it readonly again.   
      
   When running in snapshot mode you don't have to care about clean   
   shutdowns, you can simply close the qemu Window to "shutdown".   
      
   regards Henrik   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)