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

Answer 1

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

Answer 2

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