Fix ARG referencing another ARG in FROM statement

[kevinleturc]

Description

Building from a Dockerfile like the one below:

ARG IMAGE_NAME=alpine
ARG IMAGE_TAG=latest
ARG FULL_IMAGE=${IMAGE_NAME}:${IMAGE_TAG}
FROM ${FULL_IMAGE}

results in the error below:

Caused by: java.lang.IllegalArgumentException: Illegal group reference
    at java.util.regex.Matcher.appendExpandedReplacement (Matcher.java:1113)
    at java.util.regex.Matcher.appendReplacement (Matcher.java:1043)
    at java.util.regex.Matcher.replaceFirst (Matcher.java:1446)
    at java.lang.String.replaceFirst (String.java:3025)
    at io.fabric8.maven.docker.util.DockerFileUtil.resolveImageTagFromArgs (DockerFileUtil.java:189)
    at io.fabric8.maven.docker.util.DockerFileUtil.extractBaseImages (DockerFileUtil.java:70)

This is because DockerFileUtil.resolveImageTagFromArgs doesn't recursively resolve the args, and the curly brackets of the inner arg breaks the Pattern replacement.

Info

• docker-maven-plugin version: 0.44.0
• Maven version (mvn -v): 3.9.8
• Docker version: 27.0.3

[rohanKanojia]

@kevinleturc : I have released 0.45.0 . Could you please check if everything is working as expected in your project and provide feedback?

[kevinleturc]

@kevinleturc : I have released 0.45.0 . Could you please check if everything is working as expected in your project and provide feedback?

I have checked the fix in our project and everything is working as expected.