ci: add workflow for releases (#3018)

GitHub Actions workflow to create a release: will upload to PyPI
and create a GitHub release with the `sdist` and `bdist_wheel`
as well.

The version code is switched to `setuptools_scm` to work well
with this flow (e.g. avoid needing to write a script that does
a `sed` on the version file and commits as part of release).

Signed-off-by: Milas Bowman <milas.bowman@docker.com>

12 files changed, 96 insertions, 22 deletions

diff --git a/.editorconfig b/.editorconfig
index d7f2776..65d0c51 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -9,3 +9,6 @@ max_line_length = 80
 
 [*.md]
 trim_trailing_whitespace = false
+
+[*.{yaml,yml}]
+indent_size = 2
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 296bf0d..d163412 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,6 +2,9 @@ name: Python package
 
 on: [push, pull_request]
 
+env:
+  DOCKER_BUILDKIT: '1'
+
 jobs:
     flake8:
         runs-on: ubuntu-latest
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..50695b1
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,44 @@
+name: Release
+
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: "Release Tag WITHOUT `v` Prefix (e.g. 6.0.0)"
+        required: true
+      dry-run:
+        description: 'Dry run'
+        required: false
+        type: boolean
+        default: true
+
+jobs:
+  publish:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '3.10'
+
+      - run: python setup.py sdist bdist_wheel
+        env:
+          SETUPTOOLS_SCM_PRETEND_VERSION_FOR_DOCKER: ${{ inputs.tag }}
+
+      - name: Publish to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        if: ! inputs.dry-run
+        with:
+          password: ${{ secrets.PYPI_API_TOKEN }}
+
+      - name: Create GitHub release
+        uses: ncipollo/release-action@v1
+        if: ! inputs.dry-run
+        with:
+          artifacts: "dist/*"
+          generateReleaseNotes: true
+          draft: true
+          commit: ${{ github.sha }}
+          token: ${{ secrets.GITHUB_TOKEN }}
+          tag: ${{ inputs.tag }}
diff --git a/.gitignore b/.gitignore
index e626dc6..c88ccc1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,6 +13,10 @@ html/*
 _build/
 README.rst
 
+# setuptools_scm
+_version.py
+
 env/
 venv/
 .idea/
+*.iml
diff --git a/Dockerfile b/Dockerfile
index c158a9d..ef9b886 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,6 @@ ARG PYTHON_VERSION=3.10
 
 FROM python:${PYTHON_VERSION}
 
-RUN mkdir /src
 WORKDIR /src
 
 COPY requirements.txt /src/requirements.txt
@@ -11,5 +10,6 @@ RUN pip install --no-cache-dir -r requirements.txt
 COPY test-requirements.txt /src/test-requirements.txt
 RUN pip install --no-cache-dir -r test-requirements.txt
 
-COPY . /src
+COPY . .
+ARG SETUPTOOLS_SCM_PRETEND_VERSION_DOCKER
 RUN pip install --no-cache-dir .
diff --git a/docker/__init__.py b/docker/__init__.py
index e5c1a8f..46beb53 100644
--- a/docker/__init__.py
+++ b/docker/__init__.py
@@ -4,7 +4,6 @@ from .client import DockerClient, from_env
 from .context import Context
 from .context import ContextAPI
 from .tls import TLSConfig
-from .version import version, version_info
+from .version import __version__
 
-__version__ = version
 __title__ = 'docker'
diff --git a/docker/constants.py b/docker/constants.py
index d5bfc35..ed341a9 100644
--- a/docker/constants.py
+++ b/docker/constants.py
@@ -1,5 +1,5 @@
 import sys
-from .version import version
+from .version import __version__
 
 DEFAULT_DOCKER_API_VERSION = '1.41'
 MINIMUM_DOCKER_API_VERSION = '1.21'
@@ -28,7 +28,7 @@ INSECURE_REGISTRY_DEPRECATION_WARNING = \
 IS_WINDOWS_PLATFORM = (sys.platform == 'win32')
 WINDOWS_LONGPATH_PREFIX = '\\\\?\\'
 
-DEFAULT_USER_AGENT = f"docker-sdk-python/{version}"
+DEFAULT_USER_AGENT = f"docker-sdk-python/{__version__}"
 DEFAULT_NUM_POOLS = 25
 
 # The OpenSSH server default value for MaxSessions is 10 which means we can
diff --git a/docker/version.py b/docker/version.py
index 88ee8b0..44eac8c 100644
--- a/docker/version.py
+++ b/docker/version.py
@@ -1,2 +1,14 @@
-version = "6.0.0-dev"
-version_info = tuple(int(d) for d in version.split("-")[0].split("."))
+try:
+    from ._version import __version__
+except ImportError:
+    try:
+        # importlib.metadata available in Python 3.8+, the fallback (0.0.0)
+        # is fine because release builds use _version (above) rather than
+        # this code path, so it only impacts developing w/ 3.7
+        from importlib.metadata import version, PackageNotFoundError
+        try:
+            __version__ = version('docker')
+        except PackageNotFoundError:
+            __version__ = '0.0.0'
+    except ImportError:
+        __version__ = '0.0.0'
diff --git a/docs/conf.py b/docs/conf.py
index 1258a42..dc3b37c 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -63,12 +63,11 @@ author = 'Docker Inc'
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
-with open('../docker/version.py') as vfile:
-    exec(vfile.read())
-# The full version, including alpha/beta/rc tags.
-release = version
-# The short X.Y version.
-version = f'{version_info[0]}.{version_info[1]}'
+# see https://github.com/pypa/setuptools_scm#usage-from-sphinx
+from importlib.metadata import version
+release = version('docker')
+# for example take major/minor
+version = '.'.join(release.split('.')[:2])
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..9554358
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,5 @@
+[build-system]
+requires = ["setuptools>=45", "setuptools_scm[toml]>=6.2"]
+
+[tool.setuptools_scm]
+write_to = 'docker/_version.py'
diff --git a/setup.py b/setup.py
index c6346b0..68f7c27 100644
--- a/setup.py
+++ b/setup.py
@@ -29,9 +29,6 @@ extras_require = {
     'ssh': ['paramiko>=2.4.3'],
 }
 
-version = None
-exec(open('docker/version.py').read())
-
 with open('./test-requirements.txt') as test_reqs_txt:
     test_requirements = [line for line in test_reqs_txt]
 
@@ -42,7 +39,9 @@ with codecs.open('./README.md', encoding='utf-8') as readme_md:
 
 setup(
     name="docker",
-    version=version,
+    use_scm_version={
+        'write_to': 'docker/_version.py'
+    },
     description="A Python library for the Docker Engine API.",
     long_description=long_description,
     long_description_content_type='text/markdown',
@@ -54,6 +53,7 @@ setup(
         'Tracker': 'https://github.com/docker/docker-py/issues',
     },
     packages=find_packages(exclude=["tests.*", "tests"]),
+    setup_requires=['setuptools_scm'],
     install_requires=requirements,
     tests_require=test_requirements,
     extras_require=extras_require,
diff --git a/tests/Dockerfile b/tests/Dockerfile
index e24da47..cf2cd67 100644
--- a/tests/Dockerfile
+++ b/tests/Dockerfile
@@ -1,5 +1,5 @@
+# syntax = docker/dockerfile:1.4
 ARG PYTHON_VERSION=3.10
-
 FROM python:${PYTHON_VERSION}
 
 ARG APT_MIRROR
@@ -29,11 +29,16 @@ RUN curl -sSL -o /opt/docker-credential-pass.tar.gz \
     chmod +x /usr/local/bin/docker-credential-pass
 
 WORKDIR /src
+
 COPY requirements.txt /src/requirements.txt
-RUN pip install -r requirements.txt
+RUN --mount=type=cache,target=/root/.cache/pip \
+    pip install -r requirements.txt
 
 COPY test-requirements.txt /src/test-requirements.txt
-RUN pip install -r test-requirements.txt
+RUN --mount=type=cache,target=/root/.cache/pip \
+    pip install -r test-requirements.txt
 
 COPY . /src
-RUN pip install .
+ARG SETUPTOOLS_SCM_PRETEND_VERSION=99.0.0-docker
+RUN --mount=type=cache,target=/root/.cache/pip \
+    pip install -e .