ci: replace super-linter with ruff

Super-linter ran from the unpinned :latest image and, because of
branches-ignore: [master], never on pull requests to master. Ruff now
checks syntax errors and pyflakes rules (E9, F) on every push and PR.

Fixes the existing findings: unused imports and variables, an unused
duplicate import in instances/tests.py, and the star import in
accounts/views.py. settings-dev.py keeps its star import of the base
settings.

.github/workflows/linter.yml

@@ -1,92 +1,27 @@
-###########################
-###########################
-## Linter GitHub Actions ##
-###########################
-###########################
+name: Lint
 
-name: Lint Code Base
-
-#
-# Documentation:
-# https://help.github.com/en/articles/workflow-syntax-for-github-actions
-#
-
-#############################
-# Start the job on all push #
-#############################
 on:
   push:
     branches: [master]
   pull_request:
-    branches-ignore: [master]
-    
+    branches: [master]
 
-###############
-# Set the Job #
-###############
 jobs:
-  build:
-    name: Lint Code Base
-    # Set the agent to run on
+  ruff:
+    name: Ruff
     runs-on: ubuntu-latest
-
-    ##################
-    # Load all steps #
-    ###################
     steps:
-      ##########################
-      # Checkout the code base #
-      ##########################
-    - name: Checkout Code
-      uses: actions/checkout@v4
-      with:
-          # Full git history is needed to get a proper list of changed files within `super-linter`
-          fetch-depth: 0
+      - name: Checkout Code
+        uses: actions/checkout@v4
 
-    - name: Set up Python
-      uses: actions/setup-python@v5
-      with:
-        python-version: '3.12'
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
 
-    - name: Install Required packages
-      run: |
-        sudo apt-get update -qq
-        sudo apt-get install -y python3-venv python3-virtualenv libvirt-dev libldap2-dev libsasl2-dev python3-lxml zlib1g-dev libxslt1-dev pkg-config gcc libssl-dev
-
-    - name: Create & Activate VENV
-      run: |
-        python3 -m venv venv
-        echo "$GITHUB_WORKSPACE/venv/bin" >> "$GITHUB_PATH"
-
-    - name: Install dependencies
-      run: |
-        pip3 install --upgrade pip setuptools wheel
-        if [ -f dev/requirements.txt ]; then pip3 install -r dev/requirements.txt; else pip3 install -r conf/requirements.txt; fi
-    ################################
-    # Run Linter against code base #
-    ################################
-    - name: Lint Code Base
-      uses: docker://github/super-linter:latest
-      env:
-        FILTER_REGEX_EXCLUDE: .*(static|scss|venv|locale|templates)/.*
-        DEFAULT_BRANCH: master
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        VALIDATE_ALL_CODEBASE: false
-        VALIDATE_MARKDOWN: false
-        VALIDATE_HTML: false
-        VALIDATE_JSCPD: false
-        VALIDATE_ANSIBLE: false
-        VALIDATE_CLOJURE: false
-        VALIDATE_COFFEE: false
-        VALIDATE_DART: false
-        VALIDATE_GO: false
-        VALIDATE_JSX: false
-        VALIDATE_KOTLIN: false
-        VALIDATE_POWERSHELL: false
-        VALIDATE_PERL: false
-        VALIDATE_PHP: false
-        VALIDATE_RAKU: false
-        VALIDATE_RUBY: false
-        VALIDATE_TSX: false
-        VALIDATE_TERRAFORM: false
+      # Same ruff version as dev/requirements.txt
+      - name: Install Ruff
+        run: pip install "$(grep '^ruff==' dev/requirements.txt)"
 
+      - name: Run Ruff
+        run: ruff check --output-format=github .

accounts/test_utils.py

@@ -1,6 +1,5 @@
 import base64
 import struct
-from unittest.mock import patch
 
 from django.contrib.auth import get_user_model
 from django.core import mail

accounts/views.py

@@ -20,7 +20,7 @@ from accounts.apps import admin_password_path
 from instances.models import Instance
 
 from accounts.forms import EmailOTPForm, ProfileForm, UserSSHKeyForm
-from accounts.models import *
+from accounts.models import User, UserAttributes, UserInstance, UserSSHKey
 
 from . import forms
 from .utils import get_user_totp_device, send_email_with_otp

admin/migrations/0003_create_group_technicians.py

@@ -1,4 +1,4 @@
-from django.db import models, migrations
+from django.db import migrations
 
 def apply_migration(apps, schema_editor):
     Group = apps.get_model('auth', 'Group')

appsettings/middleware.py

@@ -1,4 +1,4 @@
-from .settings import app_settings, get_settings
+from .settings import get_settings
 
 
 class AppSettingsMiddleware(object):

appsettings/migrations/0007_auto_20220905_0918.py

@@ -1,7 +1,6 @@
 # Generated by Django 3.2.13 on 2022-06-30 07:17
 
 from django.db import migrations
-from django.utils.translation import gettext_lazy as _
 
 def update_default_settings(apps, schema_editor):
     setting = apps.get_model("appsettings", "AppSettings")

appsettings/test_appsettings.py

@@ -1,4 +1,4 @@
-from django.test import Client, TestCase
+from django.test import TestCase
 from django.urls import reverse
 
 from appsettings.models import AppSettings

appsettings/tests.py

@@ -1,3 +1,2 @@
-from django.test import TestCase
 
 # Create your tests here.

appsettings/views.py

@@ -3,7 +3,6 @@ import os
 import sass
 from admin.decorators import superuser_only
 from django.contrib import messages
-from django.contrib.auth.decorators import login_required
 from django.http import HttpResponseRedirect
 from django.shortcuts import render
 from django.utils.translation import gettext_noop as _

computes/views.py

@@ -8,10 +8,6 @@ from django.utils import timezone
 from instances.models import Instance
 from libvirt import libvirtError
 from vrtManager.connection import (
-    CONN_SOCKET,
-    CONN_SSH,
-    CONN_TCP,
-    CONN_TLS,
     connection_manager,
     wvmConnect,
 )

console/models.py

@@ -1,3 +1,2 @@
-from django.db import models
 
 # Create your models here.

datasource/test_datasource.py

@@ -1,11 +1,10 @@
 import json
-from unittest.mock import MagicMock, patch
 
 from django.test import RequestFactory, TestCase
 from django.urls import reverse
 
 from computes.models import Compute
-from datasource.views import get_client_ip, get_hostname_by_ip, os_index, os_metadata_json, os_userdata
+from datasource.views import get_client_ip, get_hostname_by_ip
 
 
 class DataSourceTestCase(TestCase):

datasource/tests.py

@@ -1,3 +1,2 @@
-from django.test import TestCase
 
 # Create your tests here.

instances/api/viewsets.py

@@ -290,7 +290,7 @@ class CreateInstanceViewSet(viewsets.ViewSet):
             volume_list.append(volume)
 
             with utils.libvirt_compute_lock(compute):
-                ret = conn.create_instance(
+                conn.create_instance(
                     name=serializer.validated_data["name"],
                     memory=serializer.validated_data["memory"],
                     vcpu=serializer.validated_data["vcpu"],

instances/test_disk_isolation.py

@@ -4,7 +4,7 @@ disk and media mutation views must be superuser-only (matching the UI, where
 the Disk tab is only rendered for superusers), and even for superusers the
 views must not act on volumes or option values taken blindly from the client.
 """
-from unittest.mock import MagicMock, patch
+from unittest.mock import patch
 
 from django.contrib.auth import get_user_model
 from django.test import TestCase

instances/test_security_mutations.py

@@ -271,7 +271,7 @@ class InstanceSecurityMutationsTestCase(TestCase):
 
         with patch("instances.utils.connection_manager.host_is_up", return_value=True), \
              patch("instances.utils.wvmInstances") as mock_instances_cls, \
-             patch("instances.utils.wvmInstance") as mock_instance_cls, \
+             patch("instances.utils.wvmInstance"), \
              patch("instances.utils.transaction.atomic"), \
              patch("instances.utils.Instance") as mock_instance_model:
 

instances/tests.py

@@ -10,7 +10,6 @@ from django.contrib.auth.models import Permission
 from django.http.response import Http404
 from django.shortcuts import reverse
 from django.test import TestCase
-from instances.views import instance
 from libvirt import VIR_DOMAIN_UNDEFINE_NVRAM
 from vrtManager.create import wvmCreate
 from vrtManager.util import randomUUID

interfaces/api/viewsets.py

@@ -1,7 +1,7 @@
 from admin.permissions import IsSuperUser
 from django.shortcuts import get_object_or_404
 from computes.models import Compute
-from rest_framework import status, viewsets
+from rest_framework import viewsets
 from rest_framework.response import Response
 from vrtManager.interface import wvmInterfaces, wvmInterface
 

interfaces/tests.py

@@ -1,3 +1,2 @@
-from django.test import TestCase
 
 # Create your tests here.

logs/tests.py

@@ -1,3 +1,2 @@
-from django.test import TestCase
 
 # Create your tests here.

networks/tests.py

@@ -1,3 +1,2 @@
-from django.test import TestCase
 
 # Create your tests here.

nwfilters/models.py

@@ -1,3 +1,2 @@
-from django.db import models
 
 # Create your models here.

pyproject.toml

@@ -0,0 +1,11 @@
+[tool.ruff]
+target-version = "py310"
+extend-exclude = ["static"]
+
+[tool.ruff.lint]
+# Syntax errors and pyflakes; widen the rule set step by step.
+select = ["E9", "F"]
+
+[tool.ruff.lint.per-file-ignores]
+# Settings overlay: re-exports the base settings by design.
+"webvirtcloud/settings-dev.py" = ["F403", "F405"]

storages/api/viewsets.py

@@ -3,7 +3,7 @@ from appsettings.settings import app_settings
 from computes.models import Compute
 from django.shortcuts import get_object_or_404
 from drf_spectacular.utils import extend_schema, inline_serializer
-from rest_framework import serializers, status, viewsets
+from rest_framework import serializers, viewsets
 from rest_framework.decorators import action
 from rest_framework.response import Response
 from vrtManager.storage import wvmStorage, wvmStorages

storages/views.py

@@ -290,8 +290,6 @@ def create_volume(request, compute_id, pool):
         compute.hostname, compute.login, compute.password, compute.type, pool
     )
 
-    storages = conn.get_storages()
-
     form = CreateVolumeForm(request.POST or None)
     if form.is_valid():
         data = form.cleaned_data

virtsecrets/models.py

@@ -1,3 +1,2 @@
-from django.db import models
 
 # Create your models here.

virtsecrets/tests.py

@@ -1,3 +1,2 @@
-from django.test import TestCase
 
 # Create your tests here.

vrtManager/test_rwlock.py

@@ -128,7 +128,6 @@ class TestReadWriteLock(unittest.TestCase):
     def test_writer_blocks_subsequent_readers(self):
         """Pending writers take priority and should block subsequent new readers."""
         order = []
-        lock_held_event = threading.Event()
         writer_ready_event = threading.Event()
 
         # Step 1: Initial reader holds read lock

vrtManager/test_util.py

@@ -1,4 +1,3 @@
-import re
 import unittest
 
 from django.conf import settings

vrtManager/test_xml_safety.py

@@ -290,7 +290,6 @@ class TestPersistentDiskEditing(unittest.TestCase):
         )
 
     def test_running_bus_change_preserves_disk_and_pending_domain_configuration(self):
-        from lxml import etree
         self.assertTrue(self.domain.isActive())
         live_before = self.domain.XMLDesc(0)
         self.edit(bus="sata")

vrtManager/util.py

@@ -6,7 +6,7 @@ import string
 import libvirt
 import lxml.etree as etree
 
-from django.conf import UserSettingsHolder, settings
+from django.conf import settings
 
 
 def is_kvm_available(xml):