Re: [GD-General] Multifile atomic updates

[Mike W. <mi...@ge...>]

doh, sorry bout the double post
my bad
mike

Mike Wuetherick wrote:

> i'd think that you'd have your updater application set an ini or 
> registry entry indicating 'startedupdate=1' or something and then have 
> some kind of launcher application that does checks of the application, 
> reads this setting on every launch, if the 'startedupdate' is set, but 
> not 'finishedupdate', then prompt the user to finish the update they 
> started, which could check at what state the update is in, if the 
> files have been downloaded locally already, the user doesn't have to 
> do that step, you can md5 the files to make sure they are valid before 
> applying the changes (taking into account terminated downloads) and 
> download any 'broken' files as necessary...
>
> or use VISE AutoUpdate that does all this fun stuff for you ;]
>
> mike w
> www.gekidodesigns.com
>
>
> Brian Hook wrote:
>
>> Say you have a patch installer that needs to update the following files:
>>
>> GAME.EXE
>> GAME.DLL
>> NETAPI.DLL
>>
>> The typical way would be to download the patch, apply it to temporary 
>> files, then copy over the files upon completion.
>>
>> PATCH GAME.EXE NEWGAME.EXE
>> PATCH GAME.DLL NEWGAME.DLL
>> PATCH NETAPI.DLL NEWNETAPI.DLL
>>
>> //Assume UPDATE renames existing to .EXT.OLD
>> //and copies NEW*.EXT to *.EXT
>> UPDATE GAME.EXE
>> UPDATE GAME.DLL
>> UPDATE NETAPI.DLL
>>
>> Obviously nothing destructive happens until after the patches are 
>> applied and you can verify that everything is okay.  But what do you 
>> do if something bad happens during the destructive update portion, 
>> e.g. lost connection to remote disk or power outage or system crash, 
>> etc. during the update?
>>
>> The brute force mechanism seems a little, well, brute force, I was 
>> wondering if there's something more elegant I could do.
>>
>> Brian
>>
>>
>>
>>
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