first attempt at a common staging class

[smoors]

update: also added a test-agnostic sanity check to the staging class

[casparvl]

I'm not sure if this will work. If another test uses EESSI_Staging as a fixture, with scope session, will it then be run twice (i.e. once for each tests invoking it as a fixture)? Or once (because it's once per session scope)?

Also: even if it does run once per test that invokes this as fixture, it'll have the name EESSI_Staging both times, right? That could be confusing. But maybe that can be resolved by overwriting the test name through the variables construct? I don't know, I don't have much experience with variables as an argument to fixture.

Could you try to add the lammps case here as well? That would allow us to easily verify it.

[casparvl]

Discussed in the meeting: maybe we can do something along the lines of:

stage_files = fixture(EESSI_Staging, scope='session', variables={'sourcesdir': srcdir, 'testname': testname + '_staging'})

[casparvl]

Discussed, we'll use readonly_files #211 and simply accept that we cannot run from a nodelocal dir (requires adaptations according to #210 )