add pre-commit static analysis (emmertex#48)

.github/workflows/tests.yml

@@ -11,6 +11,9 @@ jobs:
     - uses: actions/checkout@v2
     - name: Build docker image
       run: docker build -t cereal .
+    - name: Static analysis
+      run: |
+        docker run cereal bash -c "git init && git add -A && pre-commit run --all"
     - name: Unit Tests
       run: |
         docker run cereal bash -c "scons --test --asan -j$(nproc) && messaging/test_runner"
@@ -20,4 +23,3 @@ jobs:
     - name: Test MSGQ
       run: |
         docker run cereal bash -c "MSGQ=1 python -m unittest discover ."
-

.gitignore

@@ -11,4 +11,4 @@ libmessaging_shared.*
 services.h
 .sconsign.dblite
 libcereal_shared.*
-
+.mypy_cache/

.pre-commit-config.yaml

@@ -0,0 +1,27 @@
+repos:
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: master
+    hooks:
+    -   id: check-ast
+    -   id: check-json
+    -   id: check-xml
+    -   id: check-yaml
+-   repo: https://github.com/pre-commit/mirrors-mypy
+    rev: master
+    hooks:
+    -   id: mypy
+-   repo: https://gitlab.com/PyCQA/flake8
+    rev: master
+    hooks:
+    -   id: flake8
+        args:
+        - --select=F
+-   repo: local
+    hooks:
+    -   id: pylint
+        name: pylint
+        entry: pylint
+        language: system
+        types: [python]
+        args:
+        - --disable=R,C,W

Dockerfile

@@ -7,11 +7,12 @@ ENV PATH="/root/.pyenv/bin:/root/.pyenv/shims:${PATH}"
 RUN pyenv install 3.7.3
 RUN pyenv global 3.7.3
 RUN pyenv rehash
-RUN pip3 install pyyaml==5.1.2 Cython==0.29.14 scons==3.1.1 pycapnp==0.6.4
+RUN pip3 install pyyaml==5.1.2 Cython==0.29.14 scons==3.1.1 pycapnp==0.6.4 pre-commit==2.4.0 pylint==2.5.2
 
 WORKDIR /project/cereal
 
 ENV PYTHONPATH=/project
 
 COPY . .
+RUN rm -rf .git
 RUN scons -c && scons -j$(nproc)

__init__.py

@@ -1,3 +1,4 @@
+# pylint: skip-file
 import os
 import capnp
 

messaging/__init__.py

@@ -155,7 +155,7 @@ def __init__(self, services, ignore_alive=None, addr="127.0.0.1"):
 
       try:
         data = new_message(s)
-      except capnp.lib.capnp.KjException:
+      except capnp.lib.capnp.KjException:  # pylint: disable=c-extension-no-member
         # lists
         data = new_message(s, 0)