[Libosinfo] [libosinfo PATCH v2 0/8] Use "all" arch as a fallback for media/tree detection

[Fabiano Fidêncio]

On Mon, Apr 1, 2019 at 8:36 PM Cole Robinson <crobinso at redhat.com> wrote:
>
> On 3/28/19 5:26 PM, Fabiano Fidêncio wrote:
> > This series has been written considering:
> > - https://www.redhat.com/archives/libosinfo/2019-February/msg00247.html
> >
> > Let's assume that trees and medias set with architecture "all" will be
> > treated as fallback, always.
> >
> > https://gitlab.com/libosinfo/libosinfo/issues/20
> >
> > Fabiano Fidêncio (8):
> >   db: Rename tree to treeinfo in guess_os_from_tree()
> >   db: Rename os_* to os_treeinfo_* in guess_os_from_tree()
> >   db: Consider the tree arch when guessing an OS from tree
> >   db: Deal with "all" tree architectures
> >   test-db: Add test for guessing tree from OS
> >   db: Consider the media arch when guess an OS from media
> >   db: Deal with "all" media architecture
> >   test-db: Add test to cover identifying a media with "unknown" arch
> >
> >  osinfo/osinfo_db.c                            | 184 ++++++++++++------
> >  .../dbdata/os/libosinfo.org/test-db-media.xml |  14 ++
> >  .../dbdata/os/libosinfo.org/test-db-tree.xml  |  25 +++
> >  tests/test-db.c                               |  78 ++++++++
> >  4 files changed, 237 insertions(+), 64 deletions(-)
> >  create mode 100644 tests/dbdata/os/libosinfo.org/test-db-tree.xml
> >
>
> Reviewed-by: Cole Robinson <crobinso at redhat.com>
>
> I tested with my rhel5 arch='unknown' patchset switched to arch='all'
> and things seemed to work too.
>
>
> Separate from this patchset I've been thinking about tree testing in
> general and I think before the next release we need:
>
> - A functional test to run every <tree><url> with <treeinfo> through
> libosinfo code to ensure that our logic actually detects the correct
> short-id and tree arch.

Yep, a functional test could be added to our tools, using osinfo-detect tools.
It can be done using python (in the same way we've done for osinfo-db).

I'm currently trying to work on something similar for osinfo-db-tools
and libosinfo would be my next target;

>
> - Populate the osinfo-db test suite with treeinfo files similar to what
> we do with isoinfo output and do unit testing that way.

Agreed.

>
> It scares me a little that an overly liberal regex added to osinfo-db
> could cause tree detection regressions by matching the newly added db
> entry. Partly it makes me think that we should actually attempt to match
> against every <treeinfo> or <media> in osinfo-db and return the one with
> the most matching fields. This would let us make fedora-unknown just
> have a <treeinfo><family>*Fedora*<... value and not need to worry about
> it also matching other Fedora versions since those will have more than
> one field. It will also reduce the chance of accidental collision with
> newly added <os>. Just some ideas...

Hmmm. I like the idea, but it'd make things slightly slower.
In order to do so we could add some weight on every match we have,
sort the matches by the weight and just return the heaviest one.
Do-able.

Daniel, I'd like to hear from you here.

Best Regards,
-- 
Fabiano Fidêncio