hadolint/DL3029¶

Do not use --platform flag with constant value in FROM.

Superseded by buildkit/FromPlatformFlagConstDisallowed, which provides the same check with improved diagnostics.

Description¶

Using a hardcoded --platform value in FROM restricts image building to a single target platform. Use $BUILDPLATFORM or similar variables instead.

Examples¶

Problematic code¶

FROM --platform=linux/amd64 alpine

Correct code¶

FROM --platform=${BUILDPLATFORM} alpine

Reference¶

• hadolint/DL3029