[libvirt PATCH 09/13] selinux: introduce meson option for selinux policy install

[Daniel P. Berrangé]

On Tue, Aug 10, 2021 at 11:10:56AM +0200, Pavel Hrdina wrote:
> On Fri, Aug 06, 2021 at 06:48:06PM +0100, Daniel P. Berrangé wrote:
> > The /etc/os-release file may not even exist on OS and checking specific
> > OS names / versions in the build rules duplicates conditions that are
> > set in the RPM.
> > 
> > Instead we just look for existance of the tools we need to build the
> > policy module. In doing so, we also introduce '-Dselinux_policy'
> > feature flag to let it be controlled explicitly.
> > 
> > Since some versions will have an SELinux policy that is too old, we also
> > need to do a feature check for the newest interface(s) that we require.
> > Currently this is achieved by looking for "systemd_machined_stream_connect".
> > The "macro-expander" command can be used to check for SELinux policy
> > interfaces, as it will return empty string for any that don't exist.
> > 
> > Signed-off-by: Daniel P. Berrangé <berrange at redhat.com>
> > ---
> >  libvirt.spec.in                  |  7 ++++++
> >  meson.build                      |  1 +
> >  meson_options.txt                |  1 +
> >  src/security/meson.build         | 13 +---------
> >  src/security/selinux/meson.build | 43 ++++++++++++++++++++++++++------
> >  5 files changed, 46 insertions(+), 19 deletions(-)
> 
> [...]
> 
> > diff --git a/src/security/selinux/meson.build b/src/security/selinux/meson.build
> > index dda8730141..af5a5e38cb 100644
> > --- a/src/security/selinux/meson.build
> > +++ b/src/security/selinux/meson.build
> > @@ -1,10 +1,39 @@
> > -semod_prog = find_program('semodule_package')
> > -checkmod_prog = find_program('checkmodule')
> > -bzip2_prog = find_program('bzip2')
> > +selinux_policy_opt = get_option('selinux_policy')
> > +selinux_policy = false
> > +if not selinux_policy_opt.disabled()
> > +  semod_prog = find_program('semodule_package', required: selinux_policy_opt)
> > +  checkmod_prog = find_program('checkmodule', required: selinux_policy_opt)
> > +  macroexpander_prog = find_program('macro-expander', required: selinux_policy_opt)
> > +  bzip2_prog = find_program('bzip2')
> 
> Here we should use `, required: selinux_policy_opt` as well, otherwise
> missing bzip2 would fail the `meson setup` phase if `selinux_policy_opt`
> is `auto`.

I wonder if we should also actally check for 'sed' and 'm4' since the
script we're calling out to will invoke them too.


Regards,
Daniel
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