Re: [libvirt PATCH] qemu_conf: properly set 'deprecation_behavior' default value

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On Tue, Apr 13, 2021 at 12:53:23PM +0200, Peter Krempa wrote:
> On Tue, Apr 13, 2021 at 11:10:18 +0200, Pavel Hrdina wrote:
> > The comment for that option states that the default value is 'none' but
> > it was not set by the code.
> > 
> > Fixes: 700450449377be4bf923e91d00f8fe8cf0975f66
> > Signed-off-by: Pavel Hrdina <phrdina@xxxxxxxxxx>
> > ---
> 
> Could you please elaborate what the problem of not setting it is?
> 
> 'none' the same as NULL should result in doing nothing.

When the config is not set in qemu.conf libvirt will print the following
warning if there is any deprecated command used:

warning : qemuBuildCompatDeprecatedCommandLine:10393 : Unsupported deprecation behavior '(null)' for VM 'test'

So no NULL and 'none' are not the same.

We could fix qemuBuildCompatDeprecatedCommandLine() but I figured that
this is what we do with other options so that would be preferred
solution.

Pavel

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