Q: Is there a Dockerfile frontend syntax to refer to the resolved image pin

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#2,895 2 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
5/5
Estimated time
Over a week
Newbie friendliness
25/100
Issue type
Feature
Clarity
Needs clarification
Activity status
Stale
Tech stack
docker, dockerfile
Domain
build-system

Research direction

The issue mentions Dockerfile frontend syntax and the ARG, FROM, LABEL, RUN, and ENV instructions, but names no repository files or tests. Start by tracing how the frontend resolves the FROM image and exposes build arguments. Done means the resolved image digest can be referenced in the requested metadata and runtime-related instructions, with tests covering the example.

Written by the indexing model from the issue text.

Description

If I want to add a label to refer to my baseimage is there a automatically filled argument I can use? (In the example below I get “latest” and not “sha256:…” of the actually used image. Ideally it is a implicate $ARG so it can also be used in RUN or ENV for the image to print it later.

ARG BRANCH=latest
FROM ubuntu:$BRANCH
LABEL org.opencontainerimage.base.name=docker.io/library/ubuntu:$BRANCH \
      org.opencontainerimage.base.digest=<CURRENT FROM DIGEST>
Dominant language
Go
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Forks
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Avg merge
1d 23h
Merged PRs (30d)
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