Docker Compose incorrectly resolves variables

Docker Engine Compose
1

compose.yml (redacted):


services:

ab:

image: alpine

tmp/.env:


A=1

A1=$A

tmp/.env.override:


A=2

A1=$A

Command:


docker compose --env-file=tmp/.env --env-file=tmp/.env.override config --environment

Actual result:


A1=1

A=2

Expected:


A1=2

A=2
2

Thank for sharing your finding with the community.

If you want the developers to see this, then the right way to report it is as issue in the GitHub repository for the docker compose cli plugin: https://github.com/docker/compose/issues.

3

What is your compose version? Mine is 5.0.1 and I get the expected result.

4

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