[BUG] Docker compose build does not resolve environment vars when building when bake is enabled #12989
Description
Description
Given
.env
TEST_VALUE=${SYSTEM_VALUE:?system_value_not_set}
compose.yml
services:
test:
image: blah
build:
context: .
command: "echo test value [${TEST_VALUE}]"
Dockerfile
FROM alpine:latest
When BAKE is not used (default before Docker version 28.3.0, Update Compose to v2.37.2) the following command works:
COMPOSE_BAKE=false SYSTEM_VALUE=abc docker compose build
✔ test Built
or alternatively
export SYSTEM_VALUE=def
COMPOSE_BAKE=false docker compose build
With BAKE enabled, the commands fail:
COMPOSE_BAKE=true SYSTEM_VALUE=abc docker compose build
[+] Building 0.0s (1/1) FINISHED
=> [internal] load local bake definitions 0.0s
=> => reading from stdin 321B 0.0s
required variable SYSTEM_VALUE is missing a value: system_value_not_set
or alternatively
export SYSTEM_VALUE=def
COMPOSE_BAKE=true docker compose build
Fails.
Because the default has changed and BAKE behaves differently when loading .env files, this is now a breaking change.
Note: These commands still work as before:
COMPOSE_BAKE=true SYSTEM_VALUE=abc docker compose up
COMPOSE_BAKE=true SYSTEM_VALUE=abc docker compose run test
So the behaviour is not consistent with .env files between different docker compose commands.
Steps To Reproduce
- Use the example files above and try building the images with
docker compose build
Compose Version
Docker Compose version v2.37.3
Docker Environment
Client: Docker Engine - Community
Version: 28.3.0
Context: default
Debug Mode: false
Plugins:
buildx: Docker Buildx (Docker Inc.)
Version: v0.25.0
Path: /usr/libexec/docker/cli-plugins/docker-buildx
compose: Docker Compose (Docker Inc.)
Version: v2.37.3
Path: /usr/libexec/docker/cli-plugins/docker-compose
Server:
Containers: 27
Running: 22
Paused: 0
Stopped: 5
Images: 11
Server Version: 28.3.0
Storage Driver: overlay2
Backing Filesystem: extfs
Supports d_type: true
Using metacopy: false
Native Overlay Diff: true
userxattr: false
Logging Driver: json-file
Cgroup Driver: systemd
Cgroup Version: 2
Plugins:
Volume: local
Network: bridge host ipvlan macvlan null overlay
Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
CDI spec directories:
/etc/cdi
/var/run/cdi
Swarm: inactive
Runtimes: io.containerd.runc.v2 runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 05044ec0a9a75232cad458027ca83437aae3f4da
runc version: v1.2.5-0-g59923ef
init version: de40ad0
Security Options:
apparmor
seccomp
Profile: builtin
cgroupns
Kernel Version: 6.1.0-26-amd64
Operating System: Debian GNU/Linux 12 (bookworm)
OSType: linux
Architecture: x86_64
CPUs: 8
Total Memory: 15.62GiB
Name: copy-show-rjs
ID: 382ba1c3-fb45-4580-9ce1-b02b7cbc7e77
Docker Root Dir: /var/lib/docker
Debug Mode: false
Experimental: false
Insecure Registries:
::1/128
127.0.0.0/8
Live Restore Enabled: false
Anything else?
The .env file should resolve environment variables consistently in build and up and run, but in this case, when bake is enabled, it does not.