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

Chris Murphy lists at
Sun Jan 26 23:41:33 UTC 2014

On Jan 26, 2014, at 1:40 PM, Reindl Harald <h.reindl at> wrote:

> Am 26.01.2014 21:30, schrieb Chris Murphy:
>> On Jan 26, 2014, at 12:51 PM, Reindl Harald <h.reindl at> wrote:
>>> 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
>> This sounds like FUD and there's no actual real world example
> * i do not know what *may happen* by restore a snapshot
> * you do not know what *may* happen by restore a snapshot
> * nobody knows

Great, well I'll tell you what. I will just keep living dangerously, and when I find a real world case of this, I'll file a bug. How about that?

> because nobody *can* know what exactly packages, versions are installed
> in which combination or which *user specific* data may exist on exactly
> the FS which is restored *additionally* to what the system sofware knows
> frankly you can have your kwallet or the files your browser stores
> passwords you recently created and thought they are safe on exactly
> that FS, and they *maybe* saved *between* upgrade, realize a problem
> and restore the snapshot

Oh for f's sake. And *maybe* the next time I take a shower I'll slip and fall, so I'll just decide now to not bathe ever again. This hysterical paranoia you're going on about is even less hypothetical than slipping in the bathroom. I read this buttkiss nonsense and feel like someone has injected my brain with novocaine. 

> again: *nobody* knows for sure the *complete possible impact* on the
> users computer by restore a snapshot because a upgrade should be
> rolled back.

Well you know what I think, is that applications should largely be self contained instead of sneezing all kinds of crap all over my file system. It's one of the best examples of why I prefer using OS X compared to Windows, which are drag and drop installation of applications that don't install weird junk all over my computer. Very very easy to rollback from this.

> surely, you can do that, i and many other people won't do this now
> nor in the future for good reasons and not knowing *exactly* any
> possible impact of a operation is a *damned good* reason
> nothing more to say about that topic because
> * i *never* won't do that
> * i *never* would use LVM
> * i *never* use BTRFS
> * so my environment even does not support that snapshots

Uh huh. So this is sort like a user coming onto this forum and talking trash about all of linux and Fedora and what all is broken and doesn't fit their use case or workflow at all, and then after 50 f'n emails they say they never use linux or Fedora. Even for you this is an especially egregious waste of time and brain cells. I can even feel the rot occurring in my brain from reading this mindnumbing   nonsense you've written in this whole thread, and the icing on the cake is that you don't even use the technologies you're bitching about. Bitch, bitch, bitch. That's the only thing you've accomplished. You're just bitching. It's f'n annoying.

> why i won#t use BTRFS/LVM?
> because my drives are a Linux RAID10 and i never re-installed my system from
> scratch nor would i do that in the future and *because* not everybody is using
> a storage even supports snapshots it would be a bad idea to rely on that

I think you having access to a computer with internet access is a bad idea.

Chris Murphy

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