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docker-compose v2 should treat environment variables on Windows case-insensitively #9431

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@ikedam

Description

@ikedam

Windows handles environment variables case-insensitively.
docker-compose v1 does so.
But docker-compose v2 looks handle environment variables case-sensitively.

This relates docker/for-win#12655 .

Steps to reproduce the issue:

  1. Create a docker-compose.yaml that receives envTest:

    PS C:\envTest> type .\docker-compose.yaml
    version: '3'
    services:
      alpine:
        image: alpine
        environment:
          - envTest
        command:
          - sh
          - -c
          - |
            export|grep envTest
    
  2. Define ENVTEST:

    PS C:\envTest> $ENV:ENVTEST="foobar"
    PS C:\envTest> echo $ENV:envTest
    foobar
    
  3. run with docker-compose: docker compose run --rm alpine

Describe the results you received:

No output from container:

PS C:\envTest> docker compose run --rm alpine
PS C:\envTest>

Describe the results you expected:

ENVTEST should be passed as envTest:

PS C:\envTest> docker compose run --rm alpine
export envTest='foobar'
PS C:\envTest>

Additional information you deem important (e.g. issue happens only occasionally):

Behavior with docker-compose v1:

PS C:\envTest> docker-compose version
docker-compose version 1.29.2, build 5becea4c
docker-py version: 5.0.0
CPython version: 3.9.0
OpenSSL version: OpenSSL 1.1.1g  21 Apr 2020
PS C:\envTest> docker-compose run --rm alpine
Creating envtest_alpine_run ... done
export envTest='foobar'
PS C:\envTest>

Behavior with docker run:

PS C:\envTest> docker run --rm -e envTest alpine /bin/sh -c export|findstr envTest
export envTest='foobar'
PS C:\envTest>

Output of docker compose version:

Docker Compose version v2.4.1

Output of docker info:

Client:
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc., v0.8.2)
  compose: Docker Compose (Docker Inc., v2.4.1)
  grun:  (ikedam)
  sbom: View the packaged-based Software Bill Of Materials (SBOM) for an image (Anchore Inc., 0.6.0)
  scan: Docker Scan (Docker Inc., v0.17.0)

Server:
 Containers: 15
  Running: 1
  Paused: 0
  Stopped: 14
 Images: 115
 Server Version: 20.10.14
 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: 1
 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: 3df54a852345ae127d1fa3092b95168e4a88e2f8
 runc version: v1.0.3-0-gf46b6ba
 init version: de40ad0
 Security Options:
  seccomp
   Profile: default
 Kernel Version: 4.19.128-microsoft-standard
 Operating System: Docker Desktop
 OSType: linux
 Architecture: x86_64
 CPUs: 8
 Total Memory: 3.841GiB
 Name: docker-desktop
 ID: HFIZ:YWTT:JRFM:7DHC:PSS5:6HRS:VPW6:PIZ2:VKAK:E53J:IAU5:XXTG
 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

WARNING: No blkio throttle.read_bps_device support
WARNING: No blkio throttle.write_bps_device support
WARNING: No blkio throttle.read_iops_device support
WARNING: No blkio throttle.write_iops_device support
WARNING: bridge-nf-call-iptables is disabled
WARNING: bridge-nf-call-ip6tables is disabled

Additional environment details:

  • Windows 10 Pro 21H2 19044.1645 (x64)

  • Docker Desktop (Windows) Version 4.7.1 (77678)

  • docker version:

    Client:
     Cloud integration: v1.0.23
     Version:           20.10.14
     API version:       1.41
     Go version:        go1.16.15
     Git commit:        a224086
     Built:             Thu Mar 24 01:53:11 2022
     OS/Arch:           windows/amd64
     Context:           default
     Experimental:      true
    
    Server: Docker Desktop 4.7.1 (77678)
     Engine:
      Version:          20.10.14
      API version:      1.41 (minimum version 1.12)
      Go version:       go1.16.15
      Git commit:       87a90dc
      Built:            Thu Mar 24 01:46:14 2022
      OS/Arch:          linux/amd64
      Experimental:     false
     containerd:
      Version:          1.5.11
      GitCommit:        3df54a852345ae127d1fa3092b95168e4a88e2f8
     runc:
      Version:          1.0.3
      GitCommit:        v1.0.3-0-gf46b6ba
     docker-init:
      Version:          0.19.0
      GitCommit:        de40ad0
    
  • docker context show:

    default
    

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