Re: [PATCH 2/4] configure: Make ACL mandatory when building the QEMU driver

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On Tue, Feb 14, 2017 at 05:47:27PM +0100, Andrea Bolognani wrote:
> On Tue, 2017-02-14 at 16:20 +0000, Daniel P. Berrange wrote:
> > > On the other hand, we really only care about having the ACL
> > > APIs when we are isolating QEMU, which only happens of Linux
> > > due to the namespaces requirement... So maybe we could have
> > > it as a strict requirement on Linux only, and as an optional
> > > dependency on other platforms?
> > 
> > IMHO it'd be better to just disable the namespace code at build
> > time if we don't have libacl rather than adding mandatory build
> > deps.
> 
> I'm afraid that might lead to people forgetting to install
> libacl-devel[1] on Linux and ending up with less security
> than expected / desired as a result.

You can make the same argument about many other libraries we have
optional dependancies against, libcapng, libselinux, apparmour,
etc.

Our general policy is for libraries to be optional and I don't
see a reason for this to be a different case

> [1] I know I did while trying to figure this bug out ;)

If we disabled namespace support when libacl is missing at
build time you would have noticed quite quickly that you
weren't using namespaces.


Regards,
Daniel
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