Re: Snapshotting for rollback after updates was[ Re: Drawing lessons from fatal SELinux bug #1054350]

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Am 26.01.2014 20:45, schrieb Chris Murphy:
>> So ?
>> It is only visible if you downgrade which a lot of software do not
>> support and explicitly so
> 
> The right way to do file format changes is you design the new format. 
> And in a minor version update, the application gains the ability to 
> read the new file format, but still writes the old file format. 
> The major version upgrade of the application is enabled to write the 
> new file format, while it can read either old or new formats.

please look at the hidden folders in your userhome and /var/lib/
to get a picture about what we are talking here

> If Adobe Photoshop version n.1.0 started to write out Photoshop documents 
> in a manner that n.0.0 could not read, 100% of users would call it a major bug, 
> and it would escalate into vicious name calling

nobody but you is talking about documents the user really visualizes

> Breaking downward compatibility in file formats for regular Joe user is courting 
> public relations disaster. It can kill a product. Even Microsoft doesn't do this lightly

nobody but you is talking about documents the user really visualizes

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