From ba5a918904f73b9b1c12843945f6443bcb7c6a99 Mon Sep 17 00:00:00 2001
From: Chris Evich <cevich@redhat.com>
Date: Wed, 5 Aug 2020 09:48:04 -0400
Subject: [PATCH] Cirrus: Note matrix filter resolution

Signed-off-by: Chris Evich <cevich@redhat.com>
---
 .cirrus.yml | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/.cirrus.yml b/.cirrus.yml
index ce99cb0a5..cd5a56ce6 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -62,8 +62,10 @@ testing_task:
         - lint
 
     # Not all $TEST_DRIVER combinations are valid for all OS types.
-    # Note: Nested-variable resolution happens at runtime, not eval. time.
-    # Use verbose logic for ease of reading/maintaining.
+    # N/B: As of the addition of this note, nested-variable resolution
+    # does not happen for boolean `only_if` expressions.  Since $VM_IMAGE
+    # contains nested variables, we must filter based on that and not the
+    # actual distro/version value.
     only_if: >-
         ( $VM_IMAGE =~ '.*UBUNTU.*' && $TEST_DRIVER == "vfs" ) ||
         ( $VM_IMAGE =~ '.*UBUNTU.*' && $TEST_DRIVER == "aufs" ) ||