buildkit/InvalidDefaultArgInFrom

Using the global ARGs with default values should produce a valid build.

Property	Value
Severity	Error
Category	Correctness
Default	Enabled

Description

An ARG used in an image reference should be valid when no build arguments are used. An image build should not require --build-arg to produce a valid build. If a global ARG has no default value and is interpolated into a FROM instruction, the resulting image reference may be invalid when the argument is not supplied at build time.

Examples

Bad:

ARG TAG
FROM busybox:${TAG}

Good:

ARG TAG=latest
FROM busybox:${TAG}

Good (empty ARG is OK if image is valid with it empty):

ARG VARIANT
FROM busybox:stable${VARIANT}

Good (default value syntax):

ARG TAG
FROM alpine:${TAG:-3.14}

Reference

https://docs.docker.com/reference/build-checks/invalid-default-arg-in-from/

​Description

​Examples

​Reference

Description

Examples

Reference