bake doesn't pass env vars to replace values in docker-compose.yaml

[FernandoMiguel]

Having an environment variable on a tty doesn't seem be passed to buildx, as it was on docker-compose

besides #16 , I don't see an option to pass args

export FOO=bar
/usr/libexec/docker/cli-plugins/docker-buildx bake --progress plain -f docker-compose.yml

  image:
    image: image/test:${FOO}
    build:
      context: .
      dockerfile: buildx

github.com/docker/buildx v0.2.2-6-g2b03339-tp-docker 2b03339

Client: Docker Engine - Community
Version: 19.03.0-rc3
API version: 1.40
Go version: go1.12.5
Git commit: 27fcb77
Built: Thu Jun 20 02:02:44 2019
OS/Arch: linux/amd64
Experimental: false

Server: Docker Engine - Community
Engine:
Version: 19.03.0-rc3
API version: 1.40 (minimum version 1.12)
Go version: go1.12.5
Git commit: 27fcb77
Built: Thu Jun 20 02:01:20 2019
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.2.6
GitCommit: 894b81a4b802e4eb2a91d1ce216b8817763c29fb
runc:
Version: 1.0.0-rc8
GitCommit: 425e105d5a03fabd737a126ad93d62a9eeede87f
docker-init:
Version: 0.18.0
GitCommit: fec3683

[tonistiigi]

Not sure if we want to support this. Looks quite dangerous to trust random things in current env. For hcl I think we need something better. Is this supported by docker stack deploy? Currently, you can set values in the file and override with --set if you need to.

@tiborvass

[FernandoMiguel]

Yes!! 💥