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Date: Thu, 27 Oct 2005 19:35:54 +0200
From: Vladimir Serbinenko <phcoder@gmail.com>
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To: The development of GRUB 2 <grub-devel@gnu.org>
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Subject: Re: Automatic backup with grub
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>
>So what needs to be done is place an image back once in a while.  It
>should be possible to create a GRUB command for that, I guess. :-)
>  
>
Why a command? A better way, IMO, is using some variables stored in file.
It could be presented as array SAVED_INTEGER of integers and SAVED_FLAGS 
of flags.
Then with command
initsaved <file>
where <file> must be created from OS (what about a tool or shell script?)
then

initsaved /grub2/savedvars

if [[ SAVED_INTEGER[0] -ge 10]]; then
    defwin = "";
    defrest="--default";
else
    defwin = "--default";
    defrest="";
fi
   
menu $defwin windows
{
    ... # Load windows
    ((SAVED_INTEGER[0]++));
}

menu $defrest restore windows
{
    ... # Restore windows
    SAVED_INTEGER[0]=0;
}

menu reset counter
{
    SAVED_INTEGER[0]=0;
}

timeout=10;

In this way first 10 times $defwin expands to --default and "Load 
windows" becomes default. Afterwards $defrest expands to --default and 
"restore windows" becomes default

                                                                         
               Vladimir 'phcoder' Serbinenko