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openshift-merge-bot merged 1 commit into from
Jan 9, 2026
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ci-operator: auto-detected dockerfiles #569

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36 changes: 35 additions & 1 deletion content/en/docs/architecture/ci-operator.md
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Expand Up @@ -251,7 +251,41 @@ images:
as:
- nginx:latest
```
`nginx:latest` is going to be replaced with `pipeline:bin`
`nginx:latest` is going to be replaced with `pipeline:bin`

### Automatic Detection from Dockerfiles

`ci-operator` automatically detects base images referenced from `registry.ci.openshift.org` and `quay-proxy.ci.openshift.org` in Dockerfiles when `dockerfile_path` is specified, eliminating the need for manual `base_images` and `inputs` configuration.

This replaces the deprecated `registry-replacer` tool which previously added these entries via periodic PRs.

**Before (manual configuration required by registry-replacer):**
```yaml
base_images:
ocp_builder_rhel-9-golang-1.24-openshift-4.21:
name: builder
namespace: ocp
tag: rhel-9-golang-1.24-openshift-4.21

images:
- dockerfile_path: Dockerfile
inputs:
ocp_builder_rhel-9-golang-1.24-openshift-4.21:
as:
- registry.ci.openshift.org/ocp/builder:rhel-9-golang-1.24-openshift-4.21
to: my-component
```

**After (auto-detected):**
```yaml
images:
- dockerfile_path: Dockerfile
to: my-component
```

The Dockerfile's `FROM registry.ci.openshift.org/ocp/builder:rhel-9-golang-1.24-openshift-4.21` is automatically detected and configured at build time.

Manual `base_images` and `inputs` entries take precedence over auto-detection. Test container base images (used in `tests[].container.from`) must still be configured manually as they are not in project Dockerfiles.

## Build Arguments
The `build_args` option in `ci-operator` configuration specifies a list of [build arguments](https://docs.openshift.com/container-platform/4.7/cicd/builds/build-strategies.html#builds-strategy-docker-build-arguments_build-strategies). The values of those arguments are passed to the build at the build time to override their default values from Dockerfile. The value of a build argument is taken from the field `value` in the configuration.
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