Detect change in supported RR types and issue Hazard warning

(cherry picked from commit 82cfb48295d47c77de5143b5708f22acfdbfaf91)

diff --git a/dangerfile.py b/dangerfile.py
index cb25ffb3cc10f0046652e91a41eb34874b226199..8b7283e37a60d55976929bfa8a672d345388f703 100644 (file)
--- a/dangerfile.py
+++ b/dangerfile.py
@@ -42,6 +42,7 @@ def lines_containing(lines, string):
 changes_issue_or_mr_id_regex = re.compile(rb"\[(GL [#!]|RT #)[0-9]+\]")
 relnotes_issue_or_mr_id_regex = re.compile(rb":gl:`[#!][0-9]+`")
 release_notes_regex = re.compile(r"doc/(arm|notes)/notes-.*\.(rst|xml)")
+rdata_regex = re.compile(r"lib/dns/rdata/")
 
 modified_files = danger.git.modified_files
 affected_files = (
@@ -333,6 +334,11 @@ if changes_added_lines:
 #       Notes" label set.  (This ensures that merge requests updating release
 #       notes can be easily found using the "Release Notes" label.)
 #
+#     * A file was added to or deleted from the lib/dns/rdata/ subdirectory but
+#       release notes were not modified. This is probably a mistake because new
+#       RR types are a user-visible change (and so is removing support for
+#       existing ones).
+#
 # - WARN if any of the following is true:
 #
 #     * This merge request does not update release notes and has the "Customer"
@@ -357,6 +363,16 @@ if not release_notes_changed:
             "This merge request has the *Customer* label set. "
             "Update release notes unless the changes introduced are trivial."
         )
+    rdata_types_add_rm = list(
+        filter(rdata_regex.match, danger.git.created_files + danger.git.deleted_files)
+    )
+    if rdata_types_add_rm:
+        fail(
+            "This merge request adds new files to `lib/dns/rdata/` and/or "
+            "deletes existing files from that directory, which almost certainly "
+            "means that it adds support for a new RR type or removes support "
+            "for an existing one. Please add a relevant release note."
+        )
 if release_notes_changed and not release_notes_label_set:
     fail(
         "This merge request modifies release notes. "