Fix Danger rules for flagging release note issues

The logic contained in dangerfile.py incorrectly warns about missing
release note changes for merge requests preparing release documentation
as such merge requests rename files in the doc/notes/ directory.  This
(correctly) causes these files to be passed to dangerfile.py via
danger.git.created_files and danger.git.deleted_files rather than via
danger.git.modified_files, which in turn causes the logic checking the
use of the "Release Notes" label to assume that no release notes are
added, removed, or modified by a given merge request.

Fix by considering all types of file changes (modifications, additions,
and removals - which also covers file renaming) when checking whether a
given merge request modifies release notes.  Update the warning messages
accordingly.

However, when trying to find release notes added by a given merge
request, deleted files must not be considered.  Tweak the logic looking
for GitLab identifiers in the release notes added by a given merge
request so that it only scans modified and added (or renamed) files.

(cherry picked from commit 0fec404c64cf367b9c2d676535c50f228355b6b5)

diff --git a/dangerfile.py b/dangerfile.py
index 2c1e7de14c64aac244e8444fa739fa6c4b3f22af..d3d3a8f4c60d947854777e652efa76f3ec9b9034 100644 (file)
--- a/dangerfile.py
+++ b/dangerfile.py
@@ -347,18 +347,18 @@ if changes_added_lines:
 #       MR.
 
 release_notes_regex = re.compile(r"doc/(arm|notes)/notes-.*\.(rst|xml)")
-release_notes_changed = list(filter(release_notes_regex.match, modified_files))
+release_notes_changed = list(filter(release_notes_regex.match, affected_files))
 release_notes_label_set = "Release Notes" in mr_labels
 if not release_notes_changed:
     if release_notes_label_set:
         fail(
             "This merge request has the *Release Notes* label set. "
-            "Add a release note or unset the *Release Notes* label."
+            "Update release notes or unset the *Release Notes* label."
         )
     elif "Customer" in mr_labels:
         warn(
             "This merge request has the *Customer* label set. "
-            "Add a release note unless the changes introduced are trivial."
+            "Update release notes unless the changes introduced are trivial."
         )
 if release_notes_changed and not release_notes_label_set:
     fail(
@@ -367,7 +367,9 @@ if release_notes_changed and not release_notes_label_set:
     )
 
 if release_notes_changed:
-    notes_added_lines = added_lines(target_branch, release_notes_changed)
+    modified_or_new_files = danger.git.modified_files + danger.git.created_files
+    release_notes_added = list(filter(release_notes_regex.match, modified_or_new_files))
+    notes_added_lines = added_lines(target_branch, release_notes_added)
     identifiers_found = filter(relnotes_issue_or_mr_id_regex.search, notes_added_lines)
     if notes_added_lines and not any(identifiers_found):
         warn("No valid issue/MR identifiers found in added release notes.")