# Customization

This document covers advanced customization options including checksum validation, custom manifests, and problem matchers.

## Validate checksum

You can specify a checksum to validate the downloaded executable. Checksums up to the default version
are automatically verified by this action. The sha256 hashes can be found on the
[releases page](https://github.com/astral-sh/uv/releases) of the uv repo.

```yaml
- name: Install a specific version and validate the checksum
  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
  with:
    version: "0.3.1"
    checksum: "e11b01402ab645392c7ad6044db63d37e4fd1e745e015306993b07695ea5f9f8"
```

## Manifest file

By default, setup-uv reads version metadata from
[`astral-sh/versions`](https://github.com/astral-sh/versions).

The `manifest-file` input lets you override that source with your own URL, for example to test
custom uv builds or alternate download locations.

### Format

The manifest file must use the same format as `astral-sh/versions`: one JSON object per line, where each object represents a version and its artifacts. The versions must be sorted in descending order. For example:

```json
{"version":"0.10.7","artifacts":[{"platform":"x86_64-unknown-linux-gnu","variant":"default","url":"https://example.com/uv-x86_64-unknown-linux-gnu.tar.gz","archive_format":"tar.gz","sha256":"..."}]}
{"version":"0.10.6","artifacts":[{"platform":"x86_64-unknown-linux-gnu","variant":"default","url":"https://example.com/uv-x86_64-unknown-linux-gnu.tar.gz","archive_format":"tar.gz","sha256":"..."}]}
```

setup-uv currently only supports `default` as the `variant`.

The `archive_format` field is currently ignored.

```yaml
- name: Use a custom manifest file
  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
  with:
    manifest-file: "https://example.com/my-custom-manifest.ndjson"
```

> [!NOTE]
> When you use a custom manifest file and do not set the `version` input, setup-uv installs the
> latest version from that custom manifest.

## Add problem matchers

This action automatically adds
[problem matchers](https://github.com/actions/toolkit/blob/main/docs/problem-matchers.md)
for python errors.

You can disable this by setting the `add-problem-matchers` input to `false`.

```yaml
- name: Install the latest version of uv without problem matchers
  uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
  with:
    add-problem-matchers: false
```
