Inconsistent env var parsing from docker-compose.yml #2854
Description
If I declare my env vars in bash, I get the following:
10:07 $ export TESTVAR=test
10:08 $ echo $TESTVAR
test
10:08 $ export TESTVAR="test"
10:08 $ echo $TESTVAR
test
However, if I create the following files:
Dockerfile:
FROM ubuntu:latest
COPY ./test.sh /test/test.sh
WORKDIR /test
ENTRYPOINT [ "/test/test.sh" ]
test.sh:
#!/bin/bash
echo "--------------TEST RUN---------------"
echo $TESTVAR
case $TESTVAR in
test)
echo "no quotes"
;;
esac
echo "------------END TEST RUN-------------"
docker-compose.yml
testthing:
dockerfile: Dockerfile
build: .
environment:
- TESTVAR="test"
I get the following output:
10:07 $ docker-compose up
Recreating compose_testthing_1
Attaching to compose_testthing_1
testthing_1 | --------------TEST RUN---------------
testthing_1 | "test"
testthing_1 | ------------END TEST RUN-------------
compose_testthing_1 exited with code 0
Changing the environment variable to TESTVAR=test produces:
10:07 $ docker-compose up
Creating compose_testthing_1
Attaching to compose_testthing_1
testthing_1 | --------------TEST RUN---------------
testthing_1 | test
testthing_1 | no quotes
testthing_1 | ------------END TEST RUN-------------
compose_testthing_1 exited with code 0
For the record, docker itself appears to handle the quotes correctly (test:latest is the same Dockerfile above being run directly):
10:11 $ docker run -it --rm -e TESTVAR="test" test:latest
--------------TEST RUN---------------
test
no quotes
------------END TEST RUN-------------
Also, compose behaves correctly when using the map syntax, i.e. TESTVAR: "test" and TESTVAR: test behave the same way, and consistently with bash (no quotes is printed).