Add linting

Change-Id: I2b5ee21c8fd1e23abc7beac164d17a07b17edcf5

.gitignore

@@ -0,0 +1,2 @@
+__pycache__/
+.nox/

.yamllint

@@ -0,0 +1,4 @@
+extends: default
+rules:
+  document-start: disable
+  line-length: disable

noxfile.py

@@ -0,0 +1,36 @@
+import nox
+
+nox.options.error_on_external_run = True
+nox.options.reuse_existing_virtualenvs = True
+
+YAML_PATHS = [
+    "./zuul.d/",
+]
+
+PYTHON_PATHS = [
+    "./noxfile.py",
+]
+
+
+@nox.session
+def black(session):
+    session.install("black")
+    session.run("black", *PYTHON_PATHS)
+
+
+@nox.session
+def isort(session):
+    session.install("isort")
+    session.run("isort", "--profile=black", *PYTHON_PATHS)
+
+
+@nox.session
+def linters(session):
+    session.install("yamllint")
+    session.install("black")
+    session.install("isort")
+    session.install("flake8")
+    session.run("yamllint", *YAML_PATHS)
+    session.run("black", "--check", *PYTHON_PATHS)
+    session.run("isort", "--profile=black", "--check", *PYTHON_PATHS)
+    session.run("flake8", *PYTHON_PATHS)

zuul.d/pipelines.yaml

@@ -9,8 +9,8 @@
     precedence: low
     require:
       gerrit:
-        open: True
-        current-patchset: True
+        open: true
+        current-patchset: true
     trigger:
       gerrit:
         - event: patchset-created
@@ -37,11 +37,11 @@
     manager: dependent
     precedence: normal
     supercedes: check
-    post-review: True
+    post-review: true
     require:
       gerrit:
-        open: True
-        current-patchset: True
+        open: true
+        current-patchset: true
         approval:
           - Workflow: 1
     trigger:
@@ -72,7 +72,7 @@
       log --format=%h) of the merge commit.
     manager: supercedent
     precedence: high
-    post-review: True
+    post-review: true
     trigger:
       gerrit:
         - event: ref-updated
@@ -88,7 +88,7 @@
     failure-message: Build failed (promote pipeline).
     manager: supercedent
     precedence: high
-    post-review: True
+    post-review: true
     trigger:
       gerrit:
         - event: change-merged
@@ -104,7 +104,7 @@
       that publish archives and documentation.
     manager: independent
     precedence: high
-    post-review: True
+    post-review: true
     trigger:
       gerrit:
         - event: ref-updated

zuul.d/projects.yaml

@@ -2,7 +2,8 @@
     name: nebulous/project-config
     check:
       jobs:
-        - noop
+        - nox-linters:
+            voting: false
     gate:
       jobs:
         - noop