Fail for backports with "Affects v9.x" labels set

Backports are not expected to have any "Affects v9.x" labels set since
those are only meant to be set for merge requests that should have
backports created for them.

diff --git a/dangerfile.py b/dangerfile.py
index cb04aeb384d0b18f00a2f184c8f2fb4cb48d9eaf..fe0d2ad0a3f31536bf45262382b0d165bf9e0994 100644 (file)
--- a/dangerfile.py
+++ b/dangerfile.py
@@ -167,6 +167,8 @@ if not danger.gitlab.mr.milestone:
 #
 # FAIL if any of the following is true for the merge request:
 #
+# * The MR is marked as a Backport and has any "Affects v9.x" label(s) set.
+#
 # * The MR is marked as Backport and the number of version labels set is
 #   different than 1.  (For backports, the version label is used for indicating
 #   its target branch.  This is a rather ugly attempt to address a UI
@@ -190,6 +192,8 @@ VERSION_LABEL_RE = re.compile(r"v9.([0-9]+)(-S)?")
 version_labels = [l for l in mr_labels if l.startswith("v9.")]
 affects_labels = [l for l in mr_labels if l.startswith("Affects v9.")]
 if is_backport:
+    if affects_labels:
+        fail("Backports must not have any *Affects v9.x* labels set.")
     if len(version_labels) != 1:
         fail(
             "This MR was marked as *Backport*. "