[IMP] *: store filestore & forwardport checkouts in temp dirs

I'm surprised this ever worked, I guess concurrent tests stopped
working long before that? Or I misunderstood some of the historical
failures as transient?

During the cleanup of the forwardport test, I'd empty out the
`user_cache_dir('forwardport') / owner`, except the owner is always
the same (more or less) so all the tests check out their repos (and
working copies) in the same directory. If one test is cleaning up
while an other is performing a forward port, the second will blow up.

Also move the filestore to a tempdir, especially during creation of
the template db: it gets leaked so over time that generates gigabytes
of data which doesn't get cleaned up. But the template db filestore is
only "necessary" during the creation of the template, once the
template's been created it's of no use and won't be copied to create
the test dbs (though it could be, I guess).

conftest.py

@@ -271,14 +271,18 @@ class DbDict(dict):
         self._adpath = adpath
     def __missing__(self, module):
         self[module] = db = 'template_%s' % uuid.uuid4()
-        subprocess.run([
-            'odoo', '--no-http',
-            '--addons-path', self._adpath,
-            '-d', db, '-i', module + ',auth_oauth',
-            '--max-cron-threads', '0',
-            '--stop-after-init',
-            '--log-level', 'warn'
-        ], check=True)
+        with tempfile.TemporaryDirectory() as d:
+            subprocess.run([
+                'odoo', '--no-http',
+                '--addons-path', self._adpath,
+                '-d', db, '-i', module + ',auth_oauth',
+                '--max-cron-threads', '0',
+                '--stop-after-init',
+                '--log-level', 'warn'
+            ],
+                check=True,
+                env={**os.environ, 'XDG_DATA_HOME': d}
+            )
         return db
 
 @pytest.fixture(scope='session')
@@ -355,7 +359,7 @@ def from_role(_):
         yield dummy_addons_path
 
 @pytest.fixture
-def server(request, db, port, module, dummy_addons_path):
+def server(request, db, port, module, dummy_addons_path, tmpdir):
     log_handlers = [
         'odoo.modules.loading:WARNING',
     ]
@@ -372,7 +376,13 @@ def server(request, db, port, module, dummy_addons_path):
         '-d', db,
         '--max-cron-threads', '0', # disable cron threads (we're running crons by hand)
         *itertools.chain.from_iterable(('--log-handler', h) for h in log_handlers),
-    ])
+    ], env={
+        **os.environ,
+        # stop putting garbage in the user dirs, and potentially creating conflicts
+        # TODO: way to override this with macOS?
+        'XDG_DATA_HOME': str(tmpdir.mkdir('share')),
+        'XDG_CACHE_HOME': str(tmpdir.mkdir('cache')),
+    })
 
     try:
         wait_for_server(db, port, p, module)

forwardport/tests/conftest.py

@@ -1,12 +1,8 @@
 # -*- coding: utf-8 -*-
-import pathlib
 import re
-import requests
-from shutil import rmtree
 
 import pytest
-
-from odoo.tools.appdirs import user_cache_dir
+import requests
 
 @pytest.fixture
 def default_crons():
@@ -47,20 +43,6 @@ def _check_scopes(config):
         assert token_scopes >= required_scopes, \
             "%s should have scopes %s, found %s" % (section, token_scopes, required_scopes)
 
-@pytest.fixture(autouse=True)
-def _cleanup_cache(config, users):
-    """ forwardport has a repo cache which it assumes is unique per name
-    but tests always use the same repo paths / names for different repos
-    (the repos get re-created), leading to divergent repo histories.
-
-    So clear cache after each test, two tests should not share repos.
-    """
-    yield
-    cache_root = pathlib.Path(user_cache_dir('forwardport'))
-    rmtree(cache_root / config['github']['owner'], ignore_errors=True)
-    for login in users.values():
-        rmtree(cache_root / login, ignore_errors=True)
-
 @pytest.fixture()
 def module():
     """ When a test function is (going to be) run, selects the containing