hadolint/DL3023¶

COPY --from cannot reference its own FROM alias.

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¶

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

Correct code¶

FROM debian:jesse as build
RUN stuff

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

Reference¶

• hadolint/DL3023