Re: PATCH 1/4: AppArmor updates

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On Mon, Aug 16, 2010 at 01:45:45PM -0500, Jamie Strandboge wrote:
> > Why do we need special behaviour to skip files which don't exist ?
> > If this is solely to keep the test suite happy, then IMHO the
> > fix should be in the test suite. Runtime production code shouldn't
> > have workarounds for test code.
> 
> This is not to work around the test suite.
> 
> The intent is to help people migrating from < 0.8.3 to 0.8.3. When
> considering the following binary states: file exists, disk format is
> specified, ignoreOpenFailure and allowProbing, what is in trunk (ie
> ignoreOpenFailure=true) and this patch work the same in all cases except
> when the file does not exist and the format is not specified and
> allowProbing=false (the new default). With what is in trunk, this is an
> error condition, with my patch, the domain will start but the disk is
> not added to the profile. Throwing an error because the format isn't
> correct on a disk that doesn't exist seemed an odd side-effect when
> migrating. I can see arguments against this, and would like to commit
> the changes to tests/virt-aa-helper-test regardless.

How can the domain start if the configured disk file doesn't exist on
the host filesystem ? QEMU will try to open a non-existant file, fail,
and abort. Failing on non-existant files when setting up the security
profile doesn't change that, it just makes us report the problem to the
user soon in the startup process.

Daniel
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