tests: series: new script running b4 diff

core/test.py

@@ -130,6 +130,13 @@ def _exec_run(self, tree, thing, result_dir):
             if hasattr(thing, 'first_in_series'):
                 env["FIRST_IN_SERIES"] = str(int(thing.first_in_series))
 
+            if hasattr(thing, 'pw_series'):
+                pw_series = thing.pw_series
+                if pw_series['cover_letter']:
+                    env["MSGID"] = str(pw_series['cover_letter']['msgid'])
+                elif pw_series['patches']:
+                    env["MSGID"] = str(pw_series['patches'][0]['msgid'])
+
             out, err = CMD.cmd_run(self.info["run"], include_stderr=True, cwd=tree.path,
                                    pass_fds=[wfd], add_env=env)
         except core.cmd.CmdError as e:

docker/build/Dockerfile

@@ -7,7 +7,7 @@ LABEL name=nipa-build
 
 RUN sudo dnf install -y \
 		clang llvm lld \
-		ruff pylint yamllint jsonschema shellcheck \
+		b4 ruff pylint yamllint jsonschema shellcheck \
 		dwarves libasan libasan-static glibc-devel.i686 \
 		rustc \
 		perl-Git lei \

tests/series/diff/diff.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# Copyright (c) 2026 Matthieu Baerts
+
+if [ -z "${MSGID}" ]; then
+  echo "MSGID not set" >&"${DESC_FD}"
+  exit 0
+fi
+
+OUT="${RESULTS_DIR}/b4-diff.ansi"
+
+# ignore errors, we just want to see the diff if available
+b4 diff --color --output-diff "${OUT}" "${MSGID}" || true
+
+if [ -s "${OUT}" ]; then
+  echo "Diff with the previous version in $(basename "${OUT}")" >&"${DESC_FD}"
+else
+  echo "No diff available" >&"${DESC_FD}"
+fi

tests/series/diff/info.json

@@ -0,0 +1,3 @@
+{
+  "run": ["diff.sh"]
+}