44 lines
1.5 KiB
Markdown
44 lines
1.5 KiB
Markdown
# docker-check-base-image-diff
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A Github Action that checks whether a derived image does not consist of a base image. Leverages
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[`skopeo`](https://github.com/containers/skopeo) and [`jq`](https://stedolan.github.io/jq/).
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Based on [lucacome's docker-image-update-checker](https://github.com/lucacome/docker-image-update-checker).
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## Usage
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Note that this action _assumes_ that `skopeo` is installed; this appears to be true for GitHub's Ubuntu runners.
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### Inputs
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#### `base-image`
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A required argument, this represents the "base" image you want to check against.
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As this is based on `skopeo`, it expects a string representing a container, and following a certain format
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(e.g. `docker://rust:slim-buster`). For more information, see [the `skopeo` README](https://github.com/containers/skopeo#skopeo-).
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#### `derived-image`
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A required argument, this represents the "derived" image you want to check.
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As this is based on `skopeo`, it expects a string representing a container, and following a certain format
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(e.g. `docker://rust:slim-buster`). For more information, see [the `skopeo` README](https://github.com/containers/skopeo#skopeo-).
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### Outputs
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#### `differs`
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The action returns either `true` or `false`, indicating if the derived image differs from the base image (e.g. if derived does not contain the base, it returns `true`).
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## Example
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```yaml
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- name: Run
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id: run
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uses: ClementTsang/docker-check-base-image-diff@v0.0.2
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with:
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base-image: docker://rust:slim-buster
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derived-image: docker://ghcr.io/clementtsang/cargo-deb-arm
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```
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