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Document official setup-uv action
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charliermarsh committed Sep 5, 2024
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## Installation

uv installation differs depending on the platform:
For use with GitHub Actions, we recommend the official
[`astral-sh/setup-uv`](https://github.com/astral-sh/setup-uv) action, which installs uv, adds it to
PATH, (optionally) persists the cache, and more, with support for all uv-supported platforms.

=== "Linux"
To install the latest version of uv:

```yaml title="example.yml"
name: Example on Linux

jobs:
uv-example-linux:
name: python-linux
runs-on: ubuntu-latest

steps:
- uses: actions/checkout@v4

- name: Set up uv
# Install latest uv version using the installer
run: curl -LsSf https://astral.sh/uv/install.sh | sh
```

=== "macOS"

```yaml title="example.yml"
name: Example on macOS

jobs:
uv-example-macos:
name: python-macos
runs-on: macos-latest

steps:
- uses: actions/checkout@v4

- name: Set up uv
# Install latest uv version using the installer
run: curl -LsSf https://astral.sh/uv/install.sh | sh
```

=== "Windows"

```yaml title="example.yml"
name: Example on Windows
```yaml title="example.yml" hl_lines="14-16"
name: Example

jobs:
uv-example-windows:
name: python-windows
runs-on: windows-latest
jobs:
uv-example:
name: python
runs-on: ubuntu-latest

steps:
- uses: actions/checkout@v4
steps:
- uses: actions/checkout@v4

- name: Set up uv
# Install latest uv version using the installer
run: irm https://astral.sh/uv/install.ps1 | iex
shell: powershell
```
- name: Install uv
uses: astral-sh/setup-uv@v1
with:
# Install the latest version of uv (default).
version: "latest"
```
It is considered best practice to pin to a specific uv version, e.g., with:
=== "Linux"

```yaml title="example.yml"
name: Example on Linux

jobs:
uv-example-linux:
name: python-linux
runs-on: ubuntu-latest

steps:
- uses: actions/checkout@v4

- name: Set up uv
# Install a specific uv version using the installer
run: curl -LsSf https://astral.sh/uv/0.4.5/install.sh | sh
```

=== "macOS"

```yaml title="example.yml"
name: Example on macOS

jobs:
uv-example-macos:
name: python-macos
runs-on: macos-latest

steps:
- uses: actions/checkout@v4

- name: Set up uv
# Install a specific uv version using the installer
run: curl -LsSf https://astral.sh/uv/0.4.5/install.sh | sh
```

=== "Windows"

```yaml title="example.yml"
name: Example on Windows

jobs:
uv-example-windows:
name: python-windows
runs-on: windows-latest

steps:
- uses: actions/checkout@v4

- name: Set up uv
# Install a specific uv version using the installer
run: irm https://astral.sh/uv/0.4.5/install.ps1 | iex
shell: powershell
```

### Using a matrix

If you need to support multiple platforms, you can use a matrix:

```yaml title="example.yml"
```yaml title="example.yml" hl_lines="14 15"
name: Example

jobs:
uv-example-multiplatform:
name: python-${{ matrix.os }}

strategy:
matrix:
os:
- ubuntu-latest
- windows-latest
- macos-latest

fail-fast: false

runs-on: ${{ matrix.os }}
uv-example:
name: python
runs-on: ubuntu-latest

steps:
- uses: actions/checkout@v4

- name: Set up uv
if: ${{ matrix.os == 'ubuntu-latest' || matrix.os == 'macos-latest' }}
run: curl -LsSf https://astral.sh/uv/install.sh | sh

- name: Set up uv
if: ${{ matrix.os == 'windows-latest' }}
run: irm https://astral.sh/uv/install.ps1 | iex
shell: powershell
- name: Install uv
uses: astral-sh/setup-uv@v1
with:
# Install a specific version of uv.
version: "0.4.5"
```
## Setting up Python
Python can be installed with the `python install` command:

```yaml title="example.yml"
steps:
# ... setup up uv ...
```yaml title="example.yml" hl_lines="14 15"
name: Example
jobs:
uv-example:
name: python
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- name: Install uv
uses: astral-sh/setup-uv@v1
- name: Set up Python
run: uv python install
- name: Set up Python
run: uv python install
```

This will respect the Python version pinned in the project.
Expand All @@ -178,12 +83,22 @@ strategy:

Provide the version to the `python install` invocation:

```yaml title="example.yml"
steps:
# ... setup up uv ...
```yaml title="example.yml" hl_lines="14 15"
name: Example
- name: Set up Python ${{ matrix.python-version }}
run: uv python install ${{ matrix.python-version }}
jobs:
uv-example:
name: python
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- name: Install uv
uses: astral-sh/setup-uv@v1
- name: Set up Python ${{ matrix.python-version }}
run: uv python install ${{ matrix.python-version }}
```

Alternatively, the official GitHub `setup-python` action can be used. This can be faster, because
Expand All @@ -193,40 +108,77 @@ Set the
[`python-version-file`](https://github.com/actions/setup-python/blob/main/docs/advanced-usage.md#using-the-python-version-file-input)
option to use the pinned version for the project:

```yaml title="example.yml"
steps:
- name: "Set up Python"
uses: actions/setup-python@v5
with:
python-version-file: ".python-version"
```yaml title="example.yml" hl_lines="14 15 16 17"
name: Example
jobs:
uv-example:
name: python
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- name: Install uv
uses: astral-sh/setup-uv@v1
- name: "Set up Python"
uses: actions/setup-python@v5
with:
python-version-file: ".python-version"
```

Or, specify the `pyproject.toml` file to ignore the pin and use the latest version compatible with
the project's `requires-python` constraint:

```yaml title="example.yml"
steps:
- name: "Set up Python"
uses: actions/setup-python@v5
with:
python-version-file: "pyproject.toml"
```yaml title="example.yml" hl_lines="17"
name: Example
jobs:
uv-example:
name: python
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- name: Install uv
uses: astral-sh/setup-uv@v1
- name: "Set up Python"
uses: actions/setup-python@v5
with:
python-version-file: "pyproject.toml"
```

## Syncing and running

Once uv and Python are installed, the project can be installed with `uv sync` and commands can be
run in the environment with `uv run`:

```yaml title="example.yml"
steps:
# ... setup up Python and uv ...
```yaml title="example.yml" hl_lines="17-22"
name: Example
- name: Install the project
run: uv sync --all-extras --dev
jobs:
uv-example:
name: python
runs-on: ubuntu-latest
- name: Run tests
# For example, using `pytest`
run: uv run pytest tests
steps:
- uses: actions/checkout@v4
- name: Install uv
uses: astral-sh/setup-uv@v1
- name: Set up Python
run: uv python install
- name: Install the project
run: uv sync --all-extras --dev
- name: Run tests
# For example, using `pytest`
run: uv run pytest tests
```
!!! tip
Expand All @@ -239,7 +191,40 @@ steps:

It may improve CI times to store uv's cache across workflow runs.

The cache can be saved and restored with the official GitHub `cache` action:
The [`astral-sh/setup-uv`](https://github.com/astral-sh/setup-uv) has built-in support for
persisting the cache:

```yaml title="example.yml"
- name: Enable caching
uses: astral-sh/setup-uv@v1
with:
enable-cache: true
```

You can configure the action to use a custom cache directory:

```yaml title="example.yml"
- name: Define a custom uv cache path
uses: astral-sh/setup-uv@v1
with:
enable-cache: true
cache-local-path: "/path/to/cache"
```

Or invalidate it when the lockfile or its inputs change:

```yaml title="example.yml"
- name: Define a cache dependency glob
uses: astral-sh/setup-uv@v1
with:
enable-cache: true
cache-dependency-glob: "uv.lock"
```

Note that `astral-sh/setup-uv` will automatically use a separate cache key for each host
architecture and platform.

Alternatively, you can manage the cache manually with the `actions/cache` action:

```yaml title="example.yml"
jobs:
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