62 lines
2.2 KiB
Markdown
62 lines
2.2 KiB
Markdown
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# action/cascade-from
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Composite Gitea Action that bumps a `FROM <image>:<tag>` line in a target
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repo's Dockerfile, then commits and pushes. The target repo's CI fires on
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that push, rebuilding against the new base.
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The only consumer today is `fritzlab/base` triggering a rebuild of
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`fritzlab/runner` whenever the base image changes. This action is the
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generalization of that pattern.
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## Usage
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```yaml
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- uses: actions/checkout@v4
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- uses: https://code.fritzlab.net/action/image-build@v1
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with:
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image: code.fritzlab.net/fritzlab/base
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- uses: https://code.fritzlab.net/action/image-push@v1
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with:
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image: code.fritzlab.net/fritzlab/base
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token: ${{ secrets.CI_BOT_TOKEN }}
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org: fritzlab
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name: base
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- uses: https://code.fritzlab.net/action/cascade-from@v1
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with:
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target-repo: fritzlab/runner
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image: code.fritzlab.net/fritzlab/base
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token: ${{ secrets.CI_BOT_TOKEN }}
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```
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## Inputs
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| Name | Required | Default | Description |
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|---|---|---|---|
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| `target-repo` | yes | — | Target repo to edit (e.g. `fritzlab/runner`). |
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| `image` | yes | — | Image to look for in the FROM line. |
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| `tag` | no | `github.run_number` | New tag to write into FROM. |
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| `file` | no | `Dockerfile` | File inside target-repo to edit. |
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| `token` | yes | — | `CI_BOT_TOKEN` with write to target-repo. |
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| `host` | no | `code.fritzlab.net` | Gitea host without protocol. |
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| `message` | no | `bump <name> to #<tag>` | Commit message override. |
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## Behavior
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1. Shallow-clone target-repo to a temp dir.
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2. `sed -i "s|^FROM <image>:.*|FROM <image>:<tag>|" <file>`.
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3. Verify sed actually matched a line — fail if not (catches typos in image
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name).
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4. If no diff (target already on this tag): exit 0 silently.
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5. Otherwise commit + push to `main` with rebase-on-conflict retry up to
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3 times.
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## Notes
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- Only matches lines starting with `FROM <image>:` (anchored to start). Multi-stage
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Dockerfiles with a non-anchored `FROM <image>:tag AS stage` will be missed —
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add the AS-aware pattern as a future enhancement if needed.
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- Pushing to target-repo triggers its CI, which produces a new image of its
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own. There is no end-to-end orchestration: the upstream repo's CI completes
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the moment cascade-from pushes, regardless of whether the downstream build
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succeeds.
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