Add linstor witness script

.github/actions/setup-python-env/action.yml

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+name: Setup Python env
+description: Setup Python and dependencies
+inputs:
+  python-version:
+    description: Python version to use
+    required: true
+runs:
+  using: composite
+  steps:
+    - name: Set up uv
+      uses: astral-sh/setup-uv@v7
+      with:
+        enable-cache: true
+        cache-dependency-glob: uv.lock
+        version: "0.10.11"
+
+    - name: Set up Python
+      uses: actions/setup-python@v6
+      with:
+        python-version: ${{ inputs.python-version }}
+
+    - name: Install dependencies
+      shell: bash
+      run: uv sync --all-extras --dev

.github/workflows/code-checkers.yml

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+name: Code checkers
+
+on: [push, pull_request]
+
+env:
+  PYTHON_VERSIONS: '["3.8", "3.14"]'
+
+jobs:
+  setup:
+    name: Setup
+    runs-on: ubuntu-latest
+    outputs:
+      python-versions: ${{ env.PYTHON_VERSIONS }}
+      python-latest: ${{ steps.set-vars.outputs.python-latest }}
+    steps:
+      - id: set-vars
+        run: |
+          LATEST=$(echo '${{ env.PYTHON_VERSIONS }}' | jq -c '.[-1:]')
+          echo "python-latest=$LATEST" >> $GITHUB_OUTPUT
+
+  linting:
+    name: Linting
+    runs-on: ubuntu-latest
+    needs: setup
+    strategy:
+      matrix:
+        python-version: ${{ fromJSON(needs.setup.outputs.python-versions) }}
+    steps:
+      - uses: actions/checkout@v6
+      - uses: ./.github/actions/setup-python-env
+        with:
+          python-version: ${{ matrix.python-version }}
+      - run: uv run ruff check
+
+  static-type-checking:
+    name: Static type checking
+    runs-on: ubuntu-latest
+    needs: setup
+    strategy:
+      matrix:
+        python-version: ${{ fromJSON(needs.setup.outputs.python-latest) }}
+    steps:
+      - uses: actions/checkout@v6
+      - uses: ./.github/actions/setup-python-env
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Mypy check
+        run: uv run mypy
+
+  tests:
+    name: Tests
+    runs-on: ubuntu-latest
+    needs: setup
+    strategy:
+      matrix:
+        python-version: ${{ fromJSON(needs.setup.outputs.python-versions) }}
+    steps:
+      - uses: actions/checkout@v6
+      - uses: ./.github/actions/setup-python-env
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Pytest check
+        run: uv run pytest

.gitignore

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+__pycache__
+.mypy_cache
+.pytest_cache
+.ruff_cache
+*.egg-info
+*.pyc

pyproject.toml

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+[project]
+name = "xcp-storage"
+dynamic = [
+    "authors",
+    "description",
+    "license",
+    "version"
+]
+requires-python = ">=3.7" # TODO(XCPNG-3032): Change it for modern python.
+
+[build-system]
+requires = ["setuptools>=40"]
+build-backend = "setuptools.build_meta"
+
+[dependency-groups]
+dev = [
+    "mypy>=1.4.1",
+    "pytest>=7.4.4",
+    "ruff>=0.15.6",
+]
+
+[tool.mypy]
+mypy_path = "stubs"
+files = [
+    "src",
+    "tests"
+]
+
+disallow_untyped_defs = true
+enable_error_code = ["explicit-override"]
+ignore_missing_imports = false
+implicit_optional = false
+
+[[tool.mypy.overrides]]
+module = "setuptools.*"
+ignore_missing_imports = true
+
+# To generate LINSTOR stubs, run the following commands in the LINSTOR source folder:
+# ./setup.py build
+# stubgen --include-private build/lib/linstor/ -o <XCP_STORAGE_PATH>/stubs/
+# echo "from . import sharedconsts as consts" >> <XCP_STORAGE_PATH>/stubs/linstor/__init__.pyi
+[[tool.mypy.overrides]]
+module = "linstor.*"
+
+disable_error_code = [
+    "arg-type",
+    "attr-defined",
+    "explicit-override",
+    "name-defined",
+    "no-redef",
+    "override"
+]
+disallow_untyped_defs = false
+
+[tool.ruff]
+include = [
+    "src/**/*.py",
+    "tests/**/*.py"
+]
+line-length = 120
+
+[tool.ruff.lint]
+exclude = ["stubs/*"]
+ignore = [
+    "B019",   # flake8-bugbear: cached-instance-method
+    "EM101",  # flake8-errmsg: raw-string-in-exception
+    "EM102",  # flake8-errmsg: f-string-in-exception
+    "S101",   # flake8-bandit: assert
+    "S603",   # flake8-bandit: subprocess-without-shell-equals-true
+    "TD003",  # flake8-todos: missing-todo-link
+    "UP006",  # pyupgrade: non-pep585-annotation
+    "UP007",  # pyupgrade: non-pep604-annotation-union
+    "UP045",  # pyupgrade: non-pep604-annotation-optional
+]
+select = [
+    "A",      # flake8-builtins
+    "ANN",    # flake8-annotations
+    "ARG",    # flake8-unused-arguments
+    "B",      # flake8-bugbear
+    "C4",     # flake8-comprehensions
+    "C90",    # mccabe
+    "DTZ",    # flake8-datetimez
+    "E",      # pycodestyle: error
+    "EM",     # flake8-errmsg
+    "ERA",    # eradicate
+    "EXE",    # flake8-executable
+    "F",      # Pyflakes
+    "FBT",    # flake8-boolean-trap
+    "FLY",    # flynt
+    "FURB",   # refurb
+    "G",      # flake8-logging-format
+    "I",      # isort
+    "ICN",    # flake8-import-conventions
+    "INT",    # flake8-gettext
+    "LOG",    # flake8-logging
+    "N",      # pep8-naming
+    "PERF",   # perflint
+    "PIE",    # flake8-pie
+    "PLW",    # pylint: warning
+    "PTH",    # flake8-use-pathlib
+    "Q",      # flake8-quotes
+    "RET",    # flake8-return
+    "RUF013", # ruff: implicit-optional
+    "RUF059", # ruff: unused-unpacked-variable
+    "S",      # flake8-bandit
+    "SIM",    # flake8-simplify
+    "SLF",    # flake8-self
+    "T100",   # flake8-debugger
+    "T20",    # flake8-print
+    "TD",     # flake8-todos
+    "TID",    # flake8-tidy-imports
+    "UP",     # pyupgrade
+    "W",      # pycodestyle: warning
+]
+typing-modules = ["xcp_storage.typing"]
+
+[tool.ruff.lint.isort.sections]
+"typing" = ["xcp_storage.typing"]
+
+[tool.ruff.lint.isort]
+case-sensitive = false
+combine-as-imports = true
+force-sort-within-sections = true
+known-first-party = ["xcp_storage"]
+known-third-party = ["linstor"]
+lines-after-imports = 1
+order-by-type = false
+section-order = [
+    "future",
+    "standard-library",
+    "third-party",
+    "first-party",
+    "local-folder",
+    "typing"
+]
+
+[tool.ruff.lint.flake8-tidy-imports]
+ban-relative-imports = "all"
+
+[tool.pytest.ini_options]
+pythonpath = ["src", "stubs"]
+testpaths = ["tests"]

setup.cfg

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+[metadata]
+name = xcp-storage
+version = 1.0.0
+description = XCP storage layer, scripts and drivers
+author = Ronan Abhamon <ronan.abhamon@vates.tech>
+author_email = ronan.abhamon@vates.tech
+url = https://vates.tech
+license = GPLv3
+
+[options]
+packages = find:
+package_dir =
+    =src
+# TODO(XCPNG-3032): Change it for modern python.
+python_requires = >=3.6
+
+[options.packages.find]
+where = src

setup.py

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+#!/usr/bin/env python3
+#
+# Copyright (C) 2026  Vates SAS
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+
+from setuptools import setup
+
+# ==============================================================================
+
+if __name__ == "__main__":
+    setup()