renovate/lib/modules/datasource/git-refs/readme.md

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You can use this datasource plus [regex managers](../../manager/regex/index.md) to update git-based dependencies that are not natively supported by Renovate.
The `git-refs` datasource returns a reference from a Git repository.
The `packageName` must be a fully qualified domain name.
To fetch the latest _digest_ of a reference instead of the named reference: put the named reference in `currentValue` and match on the `currentDigest`.
**Usage example**
Say you want to maintain the `HEAD` digest of the `master` branch of a repository.
You would configure a custom manager in your Renovate config file for files named `versions.ini`:
```json
{
"customManagers": [
{
"customType": "regex",
"fileMatch": ["^versions.ini$"],
"matchStrings": ["GOOGLE_API_VERSION=(?<currentDigest>.*?)\\n"],
"currentValueTemplate": "master",
"depNameTemplate": "googleapis",
"packageNameTemplate": "https://github.com/googleapis/googleapis",
"datasourceTemplate": "git-refs"
}
]
}
```