Re: Anaconda snapshot KS command

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On Thu, 2016-06-23 at 08:56 -0700, Brian C. Lane wrote:
> On Thu, Jun 23, 2016 at 05:36:38PM +0200, Jiří Konečný wrote:
> > 
> > Hello guys,
> > 
> > I'm doing this bug https://bugzilla.redhat.com/show_bug.cgi?id=1113
> > 207 
> > and because of it I need to create new KS command for snapshot
> > creation. Because kickstart is something with really stable API, I
> > want
> > to ask everyone before I'll implement something badly.
> > 
> > Possible solutions:
> > 
> > 
> > Adding --snapshot parameter to existing KS command
> > --------------------------------------------------
> >  * It should be easier to implement.
> >  * Could be easier to find in documentation.
> >  * It's logically part of that storage type.
> >  * logvol command have big number of parameters now.
> > 
> > Adding standalone snapshot command
> > ----------------------------------
> >  * Harder to implement but it's more general.
> >  * Easier to extend.
> >  * Easier to just add support for btrfs with additional required
> > parameters and anything else in future and syntax will not change
> > so
> > much.
> > 
> > Personally I see the snapshot command as better choice but want to
> > hear
> > your idea.
> I like the standalone snapshot command. The user doesn't need to know
> what's underneath it and could possibly do:
> 
> autopart --type=thinp
> snapshot --name=initial_install
Yeah - and also by having a separate command, we also get a namespace
"for free", unlike if the snapshot functionality was piggybacking on an
existing command, where all commands would need to be accordingly
prefixed (--snapshot-foo, --snapshot--bar, etc.).

> 
> And then switching to btrfs would be as simple as using a different
> autopart type.
> 
> If used with non-autopart it will also need to sanity check their
> storage setup to make sure they are using something that supports
> snapshots.
> 
> I also agree with your comment in the bug, minimize changes to
> Anaconda
> and keep using /.
> 

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