# container-update-checker
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check if a container needs rebuilding  

## Environment variables
| Name              | Comment 
|-------------------|-----------
| BASE              | the image the Dockerfile is based on
| TARGET            | the image thats based of `BASE`
| REGISTRY_USERNAME | the username for logging in into the registry<br>this is only requered of private repos
| REGISTRY_PASSWORD | the password for logging in into the registry<br>(*you probaly want to use a token here*)
| REGISTRY_API      | the type of registry valid options are `docker` and `gitea`<br>Default: `docker`
| REGISTRY_URL      | the url to the registry<br>Default: `https://hub.docker.com`
| BASE_REGISTRY_USERNAME    | if left empty `REGISTRY_USERNAME` is used
| BASE_REGISTRY_PASSWORD    | if left empty `REGISTRY_PASSWORD` is used
| BASE_REGISTRY_API         | if left empty `REGISTRY_API`  is used
| BASE_REGISTRY_URL         | if left empty `REGISTRY_URL`  is used
| TARGET_REGISTRY_USERNAME  | if left empty `REGISTRY_USERNAME` is used
| TARGET_REGISTRY_PASSWORD  | if left empty `REGISTRY_PASSWORD` is used
| TARGET_REGISTRY_API       | if left empty `REGISTRY_API`  is used
| TARGET_REGISTRY_URL       | if left empty `REGISTRY_URL`  is used


## Exit codes

| State                               | Exit code | Comment
|-------------------------------------|-----------|--------
| `BASE` is more recent than `TARGET` | 0         | An update is needed
| `TARGET` is more recent than `BASE` | 1         | No update is needed<br>(*the pipeline wil "fail" but that is wat we want* )
| An error occured                    | 0         | So the pipeline can continue