+setup_virtualenv "$VENVDIR" --python python2.7
+. "$VENVDIR/bin/activate"
+
+# Needed for run_test_server.py which is used by certain (non-Python) tests.
+pip freeze 2>/dev/null | egrep ^PyYAML= \
+ || pip install PyYAML >/dev/null \
+ || fatal "pip install PyYAML failed"
+
+# Preinstall forked version of libcloud, because nodemanager "pip install"
+# won't pick it up by default.
+pip freeze 2>/dev/null | egrep ^apache-libcloud==$LIBCLOUD_PIN \
+ || pip install --pre --ignore-installed https://github.com/curoverse/libcloud/archive/apache-libcloud-$LIBCLOUD_PIN.zip >/dev/null \
+ || fatal "pip install apache-libcloud failed"
+
+# Deactivate Python 2 virtualenv
+deactivate
+
+# If Python 3 is available, set up its virtualenv in $VENV3DIR.
+# Otherwise, skip dependent tests.
+PYTHON3=$(which python3)
+if [ "0" = "$?" ]; then
+ setup_virtualenv "$VENV3DIR" --python python3
+else
+ PYTHON3=
+ skip[services/dockercleaner]=1
+ cat >&2 <<EOF
+
+Warning: python3 could not be found
+services/dockercleaner install and tests will be skipped
+
+EOF
+fi
+
+# Reactivate Python 2 virtualenv