[BUG] config --variables doesn't honor --format flag #12808
Description
Description
Providing the --variables and --format flag to the config command always results in printing in the human readable form.
A user would expect that when providing --format json the config --variables would produce a json output, but it currently doesn't
Steps To Reproduce
Using this oneliner:
printf '%s\n' \
"services:" \
" test:" \
" image: \${DOCKER_REGISTRY_BASE:-ubuntu/ubuntu:latest}" \
" ports:" \
" - \"\${BIND_ADDRESS:-127.0.0.1}:\${BIND_PORT:-8100}:8100\"" \
> /tmp/compose.yml &&
docker compose -f /tmp/compose.yml config --variables --format jsonOutput:
NAME REQUIRED DEFAULT VALUE ALTERNATE VALUE
DOCKER_REGISTRY_BASE false ubuntu/ubuntu:latest
BIND_PORT false 8100
BIND_ADDRESS false 127.0.0.1
Config example in case printf have some troubles working in your setup/terminal:
services:
test:
image: ${DOCKER_REGISTRY_BASE:-ubuntu/ubuntu:latest}
ports:
- "${BIND_ADDRESS:-127.0.0.1}:${BIND_PORT:-8100}:8100"Compose Version
v2.35.1
Docker Environment
Client: Docker Engine - Community
Version: 28.1.1
Context: default
Debug Mode: false
Plugins:
buildx: Docker Buildx (Docker Inc.)
Version: v0.23.0
Path: /usr/libexec/docker/cli-plugins/docker-buildx
compose: Docker Compose (Docker Inc.)
Version: v2.35.1
Path: /usr/libexec/docker/cli-plugins/docker-compose
Server:
Containers: 8
Running: 5
Paused: 0
Stopped: 3
Images: 40
Server Version: 28.1.1
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
Swarm: inactive
Runtimes: runc io.containerd.runc.v2
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: 6.11.0-24-generic
Operating System: Ubuntu 24.04.2 LTS
OSType: linux
Architecture: x86_64
CPUs: 20
Total Memory: 31.02GiB
Name: ale
ID: c4b213ee-6b17-445a-9dc6-6566795b9c0a
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?
Expected output:
{
"BIND_ADDRESS": {
"Name": "BIND_ADDRESS",
"DefaultValue": "127.0.0.1",
"PresenceValue": "",
"Required": false
},
"BIND_PORT": {
"Name": "BIND_PORT",
"DefaultValue": "8100",
"PresenceValue": "",
"Required": false
},
"DOCKER_REGISTRY_BASE": {
"Name": "DOCKER_REGISTRY_BASE",
"DefaultValue": "ubuntu/ubuntu:latest",
"PresenceValue": "",
"Required": false
}
}