DL3022.md

Pattern: Use of COPY --from with missing FROM alias

Issue: -

Description

Trying to copy from a missing image alias results in an error.

Example of incorrect code:

FROM debian:jesse
RUN stuff

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

Example of correct code:

FROM debian:jesse as build
RUN stuff

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

Further Reading

• Hadolint - DL3022
• Dockerfile reference - COPY