concourse / concourse/docker-image-resource
Unhelpful prints of variables
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Description
Hi friends,
The 2 first lines of my Dockerfile are:
ARG MYSQL_VERSION=5
FROM mysql:$MYSQL_VERSION
When I build this Dockerfile through the Concourse resource, with this configuration:
build_args:
email: ((docker_email))
MYSQL_VERSION: 8
these are the logs we are getting:
Step 1/30 : ARG MYSQL_VERSION=5
Step 2/30 : FROM mysql:$MYSQL_VERSION
Which is quite confusing. It really appears like the build is using MySQL 5, but we validated that it's correctly using Mysql 8, as expected.
When we run the command locally with docker build . it shows the interpolated variable, which is a lot more user friendly.
@peterhaochen47 and I
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by tracing how the Concourse resource invokes the Docker build and captures its output, then compare that output with the local docker build . logs for the Dockerfile example. Done means build logs show the interpolated MYSQL_VERSION value rather than the literal variable reference, without changing which image version is built.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- docker
- Domain
- devops
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100