[PATCH v3 6/6] test: Add linting of Python test scripts

[David Gibson <david@gibson.dropbear.id.au>]

We currently have one test moved to the new exeter based framwork written
in Python.  We plan to add many more, so add linting (flake8) and type
checking (mypy) of those scripts.  This can be invoked manually with
"make flake8" or "make mypy" in test/, and is also added to the static
checkers test set.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 test/Makefile                 | 15 ++++++++++++++-
 test/build/build.py           |  5 +++--
 test/build/static_checkers.sh |  6 +++++-
 3 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/test/Makefile b/test/Makefile
index 3800a0a9..5b5f0fc1 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -8,6 +8,8 @@
 BATS = bats -j $(shell nproc)
 EXETOOL = exeter/exetool/exetool
 WGET = wget -c
+FLAKE8 = flake8
+MYPY = mypy --strict
 
 DEBIAN_IMGS = debian-8.11.0-openstack-amd64.qcow2 \
 	debian-10-nocloud-amd64.qcow2 \
@@ -64,11 +66,15 @@ LOCAL_ASSETS = mbuto.img mbuto.mem.img podman/bin/podman QEMU_EFI.fd \
 ASSETS = $(DOWNLOAD_ASSETS) $(LOCAL_ASSETS)
 
 EXETER_PYPATH = exeter/py3
+EXETER_PYTHON = build/build.py
 EXETER_BATS = smoke/smoke.sh.bats \
-	build/build.py.bats build/static_checkers.sh.bats
+	$(EXETER_PYTHON:%=%.bats) build/static_checkers.sh.bats
 BATS_FILES = $(EXETER_BATS) \
 	podman/test/system/505-networking-pasta.bats
 
+# Python test code (for linters)
+PYPKGS = $(EXETER_PYTHON)
+
 CFLAGS = -Wall -Werror -Wextra -pedantic -std=c99
 
 assets: $(ASSETS)
@@ -127,6 +133,12 @@ medium.bin:
 big.bin:
 	dd if=/dev/urandom bs=1M count=10 of=$@
 
+flake8: pull-exeter
+	PYTHONPATH=$(EXETER_PYPATH) $(FLAKE8) $(PYPKGS)
+
+mypy: pull-exeter
+	PYTHONPATH=$(EXETER_PYPATH) $(MYPY) $(PYPKGS)
+
 $(EXETER_BATS): %.bats: % $(EXETOOL)
 	PYTHONPATH=$(EXETER_PYPATH) $(EXETOOL) bats -- $< > $@
 
@@ -141,6 +153,7 @@ debug: assets
 
 clean:
 	rm -f perf.js *~
+	rm -rf .mypy_cache
 	rm -f $(LOCAL_ASSETS)
 	rm -f $(EXETER_BATS)
 	rm -rf test_logs
diff --git a/test/build/build.py b/test/build/build.py
index e49287c9..e3de8305 100755
--- a/test/build/build.py
+++ b/test/build/build.py
@@ -18,11 +18,12 @@ import os
 from pathlib import Path
 import subprocess
 import tempfile
-from typing import Iterable, Iterator
+from typing import Iterator
 
 import exeter
 
-def sh(cmd):
+
+def sh(cmd: str) -> None:
     """Run given command in a shell"""
     subprocess.run(cmd, shell=True)
 
diff --git a/test/build/static_checkers.sh b/test/build/static_checkers.sh
index 42806e79..228b99ae 100755
--- a/test/build/static_checkers.sh
+++ b/test/build/static_checkers.sh
@@ -21,6 +21,10 @@ exeter_set_description cppcheck "passt sources pass cppcheck"
 exeter_register clang_tidy make -C .. clang-tidy
 exeter_set_description clang_tidy "passt sources pass clang-tidy"
 
-exeter_main "$@"
+exeter_register flake8 make flake8
+exeter_set_description flake8 "passt tests in Python pass flake8"
 
+exeter_register mypy make mypy
+exeter_set_description mypy "passt tests in Python pass mypy --strict"
 
+exeter_main "$@"
-- 
2.51.0