Reinitialized ARG variable resolves to an ENV variable declared at the top of the Dockerfile

[rcjsuen]

ENV ver=latest
FROM busybox:$ver
ARG ver
RUN echo $ver

Although this Dockerfile doesn't make much sense and won't actually build, we shouldn't resolve the $ver variable to latest since it's not an ARG that's defining the variable.

import { DockerfileParser } from 'dockerfile-ast';

const content = 
`ENV ver=latest
FROM busybox:$ver
ARG ver
RUN echo $ver`;

let dockerfile = DockerfileParser.parse(content);
console.log(dockerfile.resolveVariable("ver", 3));

latest