Re: [PATCH 2/3] tests/vm: Introduce get_qemu_packages_from_lcitool_vars() helper

["Daniel P. Berrangé" <berrange@redhat.com>]

On Thu, Jun 01, 2023 at 09:36:27AM +0200, Erik Skultety wrote:
> On Wed, May 31, 2023 at 10:09:05PM +0200, Philippe Mathieu-Daudé wrote:
> > The 'lcitool variables $OS qemu' command produces a file containing
> > consistent environment variables helpful to build QEMU on $OS.
> > In particular the $PKGS variable contains the packages required to
> > build QEMU.
> > 
> > Since some of these files are committed in the repository (see
> > 0e103a65ba "gitlab: support for FreeBSD 12, 13 and macOS 11 via
> > cirrus-run"), we can parse these files to get the package list
> > required to build a VM.
> > 
> > Add the get_qemu_packages_from_lcitool_vars() helper which return
> > such package list from a lcitool env var file.
> > 
> > Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> > ---
> >  tests/vm/basevm.py | 6 ++++++
> >  1 file changed, 6 insertions(+)
> > 
> > diff --git a/tests/vm/basevm.py b/tests/vm/basevm.py
> > index 8ec021ddcf..2632c3d41a 100644
> > --- a/tests/vm/basevm.py
> > +++ b/tests/vm/basevm.py
> > @@ -522,6 +522,12 @@ def get_qemu_version(qemu_path):
> >      version_num = re.split(' |\(', version_line)[3].split('.')[0]
> >      return int(version_num)
> >  
> > +def get_qemu_packages_from_lcitool_vars(vars_path):
> > +    """Parse a lcitool variables file and return the PKGS list."""
> > +    with open(vars_path, 'r') as fd:
> > +        line = list(filter(lambda y: y.startswith('PKGS'), fd.readlines()))[0]
> > +        return line.split("'")[1].split()
> 
> Nothing wrong with this one, it's also less lines of code, but just an FYI in
> case you wanted a slightly more readable (yet a tiny bit less performant piece
> of code) you could make use of the JSON format with 'variables --format json'.

Specifically we could do

   with open(vars_path, 'r') as fh:
     return json.load(fh)['pkgs']


With regards,
Daniel
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