dockerfile, output evaluated commands

Question

Is there anyway to have docker create output the evaluated line?

for example

# Dockerfile
COPY ${SRC}/file .

will echo Step 1/1 COPY ${SRC}/file .

I want it to output instead Step 1/1 COPY src/file .

Edit: I'm open to other packers that are somewhat compatible with Docker files, such as buildah bud

score 1 · Answer 1 · answered Apr 22 '22 at 15:50

1

Open an issue with Buildah, and I think this would be a reasonable change.

answered Apr 22 '22 at 15:50

rhatdan

score 0 · Answer 2 · answered Apr 20 '22 at 13:35

0

You could try listing the contents of the directory by using ls in the next step.

answered Apr 20 '22 at 13:35

Krushnal Patel

that only solves the example. it might be something like `RUN java ${JAVA_OPTS} -jar app.jar` for example. – gabriel Apr 21 '22 at 16:58

2 Answers2