bitbake: toaster/tests: add passthroughs for relevant build environment variables

Toaster build tests create new build environments which do not utlize
any existing build environment variables.
In particular, DL_DIR and SSTATE_DIR from an existing environment can
be passed in to allow for faster builds.

Adding these as passthroughs specifically resolves slow builds
related to the autobuilder integrations of the toaster test suite.

(Bitbake rev: 58cc3a4671878a425f52f9ec21636e366356bfc2)

Signed-off-by: Alexander Lussier-Cullen <alexander.lussier-cullen@savoirfairelinux.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/toaster/tests/builds/buildtest.py

@@ -116,6 +116,15 @@ class BuildTest(unittest.TestCase):
         project = Project.objects.create_project(name=BuildTest.PROJECT_NAME,
                                                  release=release)
 
+        passthrough_variable_names = ["SSTATE_DIR", "DL_DIR"]
+        for variable_name in passthrough_variable_names:
+            current_variable = os.environ.get(variable_name)
+            if current_variable:
+                ProjectVariable.objects.get_or_create(
+                    name=variable_name,
+                    value=current_variable,
+                    project=project)
+
         if os.environ.get("TOASTER_TEST_USE_SSTATE_MIRROR"):
             ProjectVariable.objects.get_or_create(
                 name="SSTATE_MIRRORS",

bitbake/lib/toaster/tox.ini

@@ -5,6 +5,9 @@ toxworkdir = {env:TOX_WORKDIR:.tox}
 passenv = *
 
 [testenv]
+passenv =
+    SSTATE_DIR
+    DL_DIR
 setenv =
     DJANGO_SETTINGS_MODULE=toastermain.settings_test
     TOASTER_BUILDSERVER=1