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Support setting DOCKER_HOST in .env file #9210

@jmera

Description

@jmera

Description

With Compose V1 we have the ability to set a project-specific DOCKER_HOST in .env, with V2 this is no longer possible.

Steps to reproduce the issue:

  1. Add an .env file with a custom value for DOCKER_HOST
  2. docker compose commands target the default docker host

Describe the results you received:
docker compose commands target the default docker host

Describe the results you expected:
docker compose commands target the docker host specified in .env

Output of docker compose version:

➜  ~ docker compose version
Docker Compose version v2.2.3

Output of docker info:

➜  ~ docker info
Client:
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc., v0.7.1)
  compose: Docker Compose (Docker Inc., v2.2.3)
  scan: Docker Scan (Docker Inc., v0.17.0)

Server:
 Containers: 0
  Running: 0
  Paused: 0
  Stopped: 0
 Images: 15
 Server Version: 20.10.12
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 io.containerd.runtime.v1.linux runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 7b11cfaabd73bb80907dd23182b9347b4245eb5d
 runc version: v1.0.2-0-g52b36a2
 init version: de40ad0
 Security Options:
  seccomp
   Profile: default
  cgroupns
 Kernel Version: 5.10.76-linuxkit
 Operating System: Docker Desktop
 OSType: linux
 Architecture: x86_64
 CPUs: 8
 Total Memory: 5.804GiB
 Name: docker-desktop
 ID: 6IUW:D7VH:NGSI:3VVB:WPYB:EQ3V:6JCD:IARV:6M6N:VRTI:MXNT:RCJ2
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 HTTP Proxy: http.docker.internal:3128
 HTTPS Proxy: http.docker.internal:3128
 No Proxy: hubproxy.docker.internal
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  hubproxy.docker.internal:5000
  127.0.0.0/8
 Live Restore Enabled: false

Additional environment details:
N/A

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