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> Fetch the complete documentation index at: https://tally.wharflab.com/llms.txt
> Use this file to discover all available pages before exploring further.

# hadolint/DL3023

> `COPY --from` cannot reference its own `FROM` alias.

`COPY --from` cannot reference its own `FROM` alias.

| Property | Value       |
| -------- | ----------- |
| Severity | Error       |
| Category | Correctness |
| Default  | Enabled     |

## Description

A `COPY --from` instruction must not reference the same stage it is running in. Trying to copy from the current stage results in an error because the
stage has not yet been finalized.

## Examples

### Problematic code

```dockerfile theme={null}
FROM debian:jesse as build
COPY --from=build some stuff ./
```

### Correct code

```dockerfile theme={null}
FROM debian:jesse as build
RUN stuff

FROM debian:jesse
COPY --from=build some stuff ./
```

## Reference

* [hadolint/DL3023](https://github.com/hadolint/hadolint/wiki/DL3023)