Migrate from pdm to uv. Clean project dependency structure

- Use uv in github workflows and nox sessions, remove pdm
- Introduce a separate nox dev dependency for locking and reproducible
  installs of nox inside ci / cd
- Extract all extra dependency groups except `full` to dev dependencies
  to avoid making them installable outside of development context

Author: olzhasar-reef

.github/workflows/cd.yml

@@ -6,6 +6,7 @@ on:
 
 env:
   PYTHON_DEFAULT_VERSION: "3.12"
+  UV_VERSION: "0.8.24"
 
 jobs:
   deploy:
@@ -26,13 +27,17 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: ${{ env.PYTHON_DEFAULT_VERSION }}
+      - uses: astral-sh/setup-uv@v7
+        with:
+          version: ${{ env.UV_VERSION }}
+          enable-cache: true
       - name: Display Python version
         run: python -c "import sys; print(sys.version)"
       - name: Install dependencies
-        run: python -m pip install --upgrade nox pdm==2.26.2
+        run: uv sync --only-group nox --locked
       - name: Build the distribution
         id: build
-        run: nox -vs build
+        run: uv run nox -vs build
       - name: Read the Changelog
         id: read-changelog
         uses: mindsers/changelog-reader-action@v2

.github/workflows/ci.yml

@@ -8,6 +8,7 @@ on:
 
 env:
   PYTHON_DEFAULT_VERSION: "3.12"
+  UV_VERSION: "0.8.24"
 
 jobs:
   lint:
@@ -24,17 +25,20 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: ${{ env.PYTHON_DEFAULT_VERSION }}
-          cache: "pip"
+      - uses: astral-sh/setup-uv@v7
+        with:
+          version: ${{ env.UV_VERSION }}
+          enable-cache: true
       - name: Install dependencies
-        run: python -m pip install --upgrade nox pdm==2.26.2
+        run: uv sync --only-group nox --locked
       - name: Run linters
-        run: nox -vs lint
+        run: uv run nox -vs lint
       - name: Validate new changelog entries
         if: (contains(github.event.pull_request.labels.*.name, '-changelog') == false) && (github.event.pull_request.base.ref != '')
         run: if [ -z "$(git diff --diff-filter=A --name-only origin/${{ github.event.pull_request.base.ref }} changelog.d)" ];
           then echo no changelog item added; exit 1; fi
       - name: Changelog validation
-        run: nox -vs towncrier_check
+        run: uv run nox -vs towncrier_check
   build:
     timeout-minutes: 30
     needs: lint
@@ -47,11 +51,14 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: ${{ env.PYTHON_DEFAULT_VERSION }}
-          cache: "pip"
+      - uses: astral-sh/setup-uv@v7
+        with:
+          version: ${{ env.UV_VERSION }}
+          enable-cache: true
       - name: Install dependencies
-        run: python -m pip install --upgrade nox pdm==2.26.2
+        run: uv sync --only-group nox --locked
       - name: Build the distribution
-        run: nox -vs build
+        run: uv run nox -vs build
   cleanup_buckets:
     timeout-minutes: 30
     needs: lint
@@ -69,13 +76,17 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: ${{ env.PYTHON_DEFAULT_VERSION }}
-          cache: "pip"
+      - uses: astral-sh/setup-uv@v7
+        if: ${{ env.B2_TEST_APPLICATION_KEY != '' && env.B2_TEST_APPLICATION_KEY_ID != '' }}  # TODO: skip this whole job instead
+        with:
+          version: ${{ env.UV_VERSION }}
+          enable-cache: true
       - name: Install dependencies
         if: ${{ env.B2_TEST_APPLICATION_KEY != '' && env.B2_TEST_APPLICATION_KEY_ID != '' }}  # TODO: skip this whole job instead
-        run: python -m pip install --upgrade nox pdm==2.26.2
+        run: uv sync --only-group nox --locked
       - name: Find and remove old buckets
         if: ${{ env.B2_TEST_APPLICATION_KEY != '' && env.B2_TEST_APPLICATION_KEY_ID != '' }}  # TODO: skip this whole job instead
-        run: nox -vs cleanup_old_buckets
+        run: uv run nox -vs cleanup_old_buckets
   test:
     timeout-minutes: 90
     needs: cleanup_buckets
@@ -107,14 +118,17 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
-          cache: "pip"
+      - uses: astral-sh/setup-uv@v7
+        with:
+          version: ${{ env.UV_VERSION }}
+          enable-cache: true
       - name: Install dependencies
-        run: python -m pip install --upgrade nox pdm==2.26.2
+        run: uv sync --only-group nox --locked
       - name: Run unit tests
-        run: nox -vs unit -- -v
+        run: uv run nox -vs unit -- -v
       - name: Run integration tests
         if: ${{ env.B2_TEST_APPLICATION_KEY != '' && env.B2_TEST_APPLICATION_KEY_ID != '' }}
-        run: nox -vs integration -- --dont-cleanup-old-buckets -v
+        run: uv run nox -vs integration -- --dont-cleanup-old-buckets -v
   doc:
     timeout-minutes: 30
     needs: build
@@ -127,13 +141,17 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: ${{ env.PYTHON_DEFAULT_VERSION }}
-          cache: "pip"
-      - name: Install dependencies
+      - uses: astral-sh/setup-uv@v7
+        with:
+          version: ${{ env.UV_VERSION }}
+          enable-cache: true
+      - name: Install system dependencies
         env:
           DEBIAN_FRONTEND: noninteractive
         run: |
           sudo apt-get update -y
           sudo apt-get install -y graphviz plantuml
-          python -m pip install --upgrade nox pdm==2.26.2
+      - name: Install dependencies
+        run: uv sync --only-group nox --locked
       - name: Build the docs
-        run: nox --non-interactive -vs doc
+        run: uv run nox --non-interactive -vs doc

.readthedocs.yml

@@ -13,8 +13,8 @@ build:
     - graphviz
   jobs:
     post_create_environment:
-      - pip install pdm
-      - pdm export --format requirements --group doc --output requirements-doc.txt
+      - python -m pip install uv==0.8.4
+      - uv export --format requirements-txt --group doc --output-file requirements-doc.txt
 
 # Build documentation in the docs/ directory with Sphinx
 sphinx:

CONTRIBUTING.md

@@ -55,9 +55,9 @@ for a given github issue).
 
 ## Developer Info
 
-You'll need to have [nox](https://github.com/theacodes/nox) and [pdm](https://pdm-project.org/) installed:
+You'll need to have [nox](https://github.com/theacodes/nox) and [uv](https://docs.astral.sh/uv/) installed:
 
-* `pip install nox pdm`
+* `pip install nox uv`
 
 With `nox`, you can run different sessions (default are `lint` and `test`):
 
@@ -99,11 +99,11 @@ Given Python interpreters should be installed in the operating system or via [py
 
 ## Managing dependencies
 
-We use [pdm](https://pdm-project.org/) for managing dependencies and developing locally.
+We use [uv](https://docs.astral.sh/uv/) for managing dependencies and developing locally.
 If you want to change any of the project requirements (or requirement bounds) in `pyproject.toml`,
-make sure that `pdm.lock` file reflects those changes by using `pdm add`, `pdm update` or other
-commands - see [documentation](https://pdm-project.org/latest/). You can verify that lock file
-is up to date by running the linter.
+make sure that `uv.lock` file reflects those changes by using `uv add`, `uv lock` or other
+commands - see [documentation](https://docs.astral.sh/uv/). You can verify that the lock file
+is up to date by running `uv lock --check`.
 
 ## Linting
 

changelog.d/+nox-dev-group.infrastructure.md

@@ -0,0 +1 @@
+Use a separate nox dependency group for reprocible installs of nox in ci / cd.

changelog.d/+pdm-to-uv.infrastructure.md

@@ -0,0 +1 @@
+Migrate from pdm to uv.

noxfile.py

@@ -19,9 +19,6 @@
 
 UPSTREAM_REPO_URL = 'git@github.com:Backblaze/b2-sdk-python.git'
 
-# Required for PDM to use nox's virtualenvs
-os.environ.update({'PDM_IGNORE_SAVED_PYTHON': '1'})
-
 CI = os.environ.get('CI') is not None
 NOX_PYTHONS = os.environ.get('NOX_PYTHONS')
 _NOX_EXTRAS = os.environ.get('NOX_EXTRAS')
@@ -59,20 +56,27 @@ def _detect_python_nox_id() -> str:
 
 PY_PATHS = ['b2sdk', 'test', 'noxfile.py']
 
-nox.options.reuse_existing_virtualenvs = True
+nox.options.default_venv_backend = 'uv'
+nox.options.reuse_existing_virtualenvs = False
 nox.options.sessions = [
     'lint',
     'test',
 ]
 
 
-def pdm_install(session: nox.Session, *args: str, dev: bool = True) -> None:
-    # dev dependencies are installed by default
-    prod_args = [] if dev else ['--prod']
-    group_args = []
-    for group in args:
-        group_args.extend(['--group', group])
-    session.run('pdm', 'install', *prod_args, *group_args, external=True)
+def uv_install(
+    session: nox.Session, *, groups: tuple[str, ...] = (), extras: tuple[str, ...] = ()
+) -> None:
+    args = ['sync', '--locked']
+    for group in groups:
+        if group:
+            args.extend(['--group', group])
+    for extra in extras:
+        if extra:
+            args.extend(['--extra', extra])
+    uv_env = getattr(session.virtualenv, 'location', os.getenv('VIRTUAL_ENV'))
+
+    session.run_install('uv', *args, env={'UV_PROJECT_ENVIRONMENT': uv_env})
 
 
 def skip_coverage(python_version: str | None) -> bool:
@@ -82,7 +86,7 @@ def skip_coverage(python_version: str | None) -> bool:
 @nox.session(name='format', python=PYTHON_DEFAULT_VERSION)
 def format_(session):
     """Lint the code and apply fixes in-place whenever possible."""
-    pdm_install(session, 'lint')
+    uv_install(session, groups=('format',))
     session.run('ruff', 'check', '--fix', *PY_PATHS)
     session.run('ruff', 'format', *PY_PATHS)
     # session.run(
@@ -99,7 +103,7 @@ def format_(session):
 def lint(session):
     """Run linters in readonly mode."""
     # We need to install 'doc' group because liccheck needs to inspect it.
-    pdm_install(session, 'doc', 'lint', 'full')
+    uv_install(session, groups=('doc', 'lint'), extras=('full',))
     session.run('ruff', 'check', *PY_PATHS)
     session.run('ruff', 'format', *PY_PATHS)
     # session.run(
@@ -114,15 +118,12 @@ def lint(session):
     session.run('pytest', 'test/static')
     session.run('liccheck', '-s', 'pyproject.toml')
 
-    # Check if the lockfile is up to date
-    session.run('pdm', 'lock', '--check', external=True)
-
 
 @nox.session(python=PYTHON_VERSIONS)
 @nox.parametrize('extras', NOX_EXTRAS)
 def unit(session, extras):
     """Run unit tests."""
-    pdm_install(session, 'test', *extras)
+    uv_install(session, groups=('test',), extras=tuple(extras))
     args = ['--doctest-modules', '-n', 'auto']
     if not skip_coverage(session.python):
         args += ['--cov=b2sdk', '--cov-branch', '--cov-report=xml']
@@ -142,14 +143,14 @@ def unit(session, extras):
 @nox.parametrize('extras', NOX_EXTRAS)
 def integration(session, extras):
     """Run integration tests."""
-    pdm_install(session, 'test', *extras)
+    uv_install(session, groups=('test',), extras=tuple(extras))
     session.run('pytest', '-s', *session.posargs, 'test/integration')
 
 
 @nox.session(python=PYTHON_DEFAULT_VERSION)
 def cleanup_old_buckets(session):
     """Remove buckets from previous test runs."""
-    pdm_install(session, 'test')
+    uv_install(session, groups=('test',))
     session.run('python', '-m', 'test.integration.cleanup_buckets')
 
 
@@ -167,15 +168,15 @@ def test(session):
 @nox.session
 def cover(session):
     """Perform coverage analysis."""
-    pdm_install(session, 'test')
+    uv_install(session, groups=('test',))
     session.run('coverage', 'report', '--fail-under=75', '--show-missing', '--skip-covered')
     session.run('coverage', 'erase')
 
 
 @nox.session(python=PYTHON_DEFAULT_VERSION)
 def build(session):
     """Build the distribution."""
-    session.run('pdm', 'build', external=True)
+    session.run('uv', 'build', external=True)
 
     # Set outputs for GitHub Actions
     if CI:
@@ -191,7 +192,7 @@ def build(session):
 @nox.session(python=PYTHON_DEFAULT_VERSION)
 def doc(session):
     """Build the documentation."""
-    pdm_install(session, 'doc')
+    uv_install(session, groups=('doc',))
     session.cd('doc')
     sphinx_args = ['-b', 'html', '-T', '-W', 'source', 'build/html']
     session.run('rm', '-rf', 'build', external=True)
@@ -216,7 +217,7 @@ def doc(session):
 @nox.session
 def doc_cover(session):
     """Perform coverage analysis for the documentation."""
-    pdm_install(session, 'doc')
+    uv_install(session, groups=('doc',))
     session.cd('doc')
     sphinx_args = ['-b', 'coverage', '-T', '-W', 'source', 'build/coverage']
     report_file = 'build/coverage/python.txt'
@@ -253,7 +254,7 @@ def make_release_commit(session):
     if current_branch != 'master':
         session.log('WARNING: releasing from a branch different than master')
 
-    pdm_install(session, 'release')
+    uv_install(session, groups=('release',))
     session.run('towncrier', 'build', '--yes', '--version', version)
 
     session.log(