WIP Allow not rerunning a cached dependency

* requires RKrahl/pytest-dependency#77, must
  document that somewhere (but it's "just convenience")

tests/install/conftest.py

@@ -1,10 +1,50 @@
 from copy import deepcopy
+import itertools
 import logging
 import os
 import pytest
 import tempfile
 
+from lib.common import shortened_nodeid
 from lib.commands import local_cmd, scp, ssh
+from lib.pool import Pool
+
+try:
+ from data import CACHE_IMPORTED_VM
+except ImportError:
+ CACHE_IMPORTED_VM = False
+assert CACHE_IMPORTED_VM in [True, False]
+
+# FIXME: pytest-order has trouble understanding such a dep will be scheduled
+def pytest_dependency_override_skip(item: pytest.Item, dependency: str, scope: str) -> bool:
+ if not CACHE_IMPORTED_VM:
+ return False
+ # FIXME duplicates parsing of --hosts, should use separate def instead
+ hosts_args = item.config.getoption("hosts")
+ hosts_split = [hostlist.split(',') for hostlist in hosts_args]
+ hostname_list = list(itertools.chain(*hosts_split))
+ if not hostname_list:
+ pytest.fail("pytest_dependency_override_skip requires at least one --hosts parameter")
+ pool = Pool(hostname_list[0])
+ host = pool.master
+
+ sr_uuid = host.main_sr_uuid()
+ dep_nodeid = _expand_scope_relative_nodeid(dependency, scope, item.nodeid)
+ if host.cached_vm(shortened_nodeid(dep_nodeid) + ".xva", sr_uuid):
+ return True
+ return False
+
+def _expand_scope_relative_nodeid(scoped_nodeid, scope, ref_nodeid):
+ if scope == 'session' or scope == 'package':
+ base = ()
+ elif scope == 'module':
+ base = ref_nodeid.split("::", 1)[:1]
+ elif scope == 'class':
+ base = ref_nodeid.split("::", 2)[:2]
+ else:
+ raise RuntimeError(f"Internal error: invalid scope {scope!r}")
+ logging.debug("scope: %r base: %r relative: %r", scope, base, scoped_nodeid)
+ return "::".join(itertools.chain(base, (scoped_nodeid,)))
 
 @pytest.fixture(scope='function')
 def answerfile(request):