Add input version-file (#486)

Closes: #411

Author: eifinger

.github/workflows/test.yml

@@ -155,6 +155,22 @@ jobs:
             exit 1
           fi
 
+  test-version-file-version:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install from requirements file
+        id: setup-uv
+        uses: ./
+        with:
+          version-file: "__tests__/fixtures/uv-in-requirements-txt-project/requirements.txt"
+      - name: Correct version gets installed
+        run: |
+          if [ "$(uv --version)" != "uv 0.6.17" ]; then
+            echo "Wrong uv version: $(uv --version)"
+            exit 1
+          fi
+
   test-checksum:
     runs-on: ${{ matrix.inputs.os }}
     strategy:
@@ -561,6 +577,7 @@ jobs:
       - test-pyproject-file-version
       - test-malformed-pyproject-file-fallback
       - test-uv-file-version
+      - test-version-file-version
       - test-checksum
       - test-with-explicit-token
       - test-uvx

README.md

@@ -15,6 +15,7 @@ Set up your GitHub Actions workflow with a specific version of [uv](https://docs
   - [Install the latest version](#install-the-latest-version)
   - [Install a specific version](#install-a-specific-version)
   - [Install a version by supplying a semver range or pep440 specifier](#install-a-version-by-supplying-a-semver-range-or-pep440-specifier)
+  - [Install a version defined in a requirements or config file](#install-a-version-defined-in-a-requirements-or-config-file)
   - [Python version](#python-version)
   - [Activate environment](#activate-environment)
   - [Working directory](#working-directory)
@@ -92,6 +93,19 @@ to install the latest version that satisfies the range.
     version: ">=0.4.25,<0.5"
 ```
 
+### Install a version defined in a requirements or config file
+
+You can use the `version-file` input to specify a file that contains the version of uv to install.
+This can either be a `pyproject.toml` or `uv.toml` file which defines a `required-version` or
+uv defined as a dependency in `pyproject.toml` or `requirements.txt`.
+
+```yaml
+- name: Install uv based on the version defined in pyproject.toml
+  uses: astral-sh/setup-uv@v6
+  with:
+    version-file: "pyproject.toml"
+```
+
 ### Python version
 
 You can use the input `python-version` to set the environment variable `UV_PYTHON` for the rest of your workflow

__tests__/fixtures/uv-in-requirements-txt-project/hello_world.py

@@ -0,0 +1 @@
+print("Hello world")

__tests__/fixtures/uv-in-requirements-txt-project/requirements.txt

@@ -0,0 +1 @@
+uv==0.6.17

action.yml

@@ -6,6 +6,9 @@ inputs:
   version:
     description: "The version of uv to install e.g., `0.5.0` Defaults to the version in pyproject.toml or 'latest'."
     default: ""
+  version-file:
+    description: "Path to a file containing the version of uv to install. Defaults to searching for uv.toml and if not found pyproject.toml."
+    default: ""
   python-version:
     description: "The version of Python to set UV_PYTHON to"
     required: false