subpath option in compose files gets silently ignored (with docker compose)

[awmath]

Issue Description

The subpath option for volumes with docker-compose get's silently ignored.

There have been comments about this in #20661. But this Issue has been closed since podman 5.4.0 added support for volume subpaths using podman run/create ---mount ...subPath=.

There has also been support for subpaths with podman kube play #16803 which works fine.

Steps to reproduce the issue

Steps to reproduce the issue

1. Install docker-compose
2. Use the following compose.yml

services:
  create-data:
    image: alpine
    command:
      - ash
      - -c
      - |
        mkdir -p /mnt/sub  
        echo "full" > /mnt/testfile
        echo "sub" > /mnt/sub/testfile
    volumes:
      - data:/mnt

  test-full:
    image: alpine
    command: cat /mnt/testfile
    depends_on:
      create-data:
        condition: service_completed_successfully
    volumes:
      - type: volume
        source: data
        target: /mnt

  test-subpath:
    image: alpine
    command: cat /mnt/testfile
    depends_on:
      create-data:
        condition: service_completed_successfully
    volumes:
      - type: volume
        source: data
        target: /mnt
        volume:
          subpath: sub/

volumes:
  data:

2. podman compose up

Describe the results you received

test-full and test-subpath services will echo "full"

Describe the results you expected

test-full should echo "full" and test-subpath should echo "sub".

podman run --rm -it --mount type=volume,source=podman-compose-subvolume_data,target=/mnt,subpath=sub alpine cat /mnt/testfile does in fact return "sub"

podman info output

host:
  arch: amd64
  buildahVersion: 1.39.4
  cgroupControllers:
  - cpu
  - io
  - memory
  - pids
  cgroupManager: systemd
  cgroupVersion: v2
  conmon:
    package: conmon-2.1.13-1.fc41.x86_64
    path: /usr/bin/conmon
    version: 'conmon version 2.1.13, commit: '
  cpuUtilization:
    idlePercent: 96.37
    systemPercent: 0.94
    userPercent: 2.68
  cpus: 16
  databaseBackend: sqlite
  distribution:
    distribution: fedora
    variant: workstation
    version: "41"
  eventLogger: journald
  freeLocks: 1957
  hostname: user.fedora
  idMappings:
    gidmap:
    - container_id: 0
      host_id: 1000
      size: 1
    - container_id: 1
      host_id: 524288
      size: 65536
    uidmap:
    - container_id: 0
      host_id: 1000
      size: 1
    - container_id: 1
      host_id: 524288
      size: 65536
  kernel: 6.13.9-200.fc41.x86_64
  linkmode: dynamic
  logDriver: journald
  memFree: 11591798784
  memTotal: 65067012096
  networkBackend: netavark
  networkBackendInfo:
    backend: netavark
    dns:
      package: aardvark-dns-1.14.0-1.fc41.x86_64
      path: /usr/libexec/podman/aardvark-dns
      version: aardvark-dns 1.14.0
    package: netavark-1.14.1-1.fc41.x86_64
    path: /usr/libexec/podman/netavark
    version: netavark 1.14.1
  ociRuntime:
    name: crun
    package: crun-1.20-2.fc41.x86_64
    path: /usr/bin/crun
    version: |-
      crun version 1.20
      commit: 9c9a76ac11994701dd666c4f0b869ceffb599a66
      rundir: /run/user/1000/crun
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +CRIU +LIBKRUN +WASM:wasmedge +YAJL
  os: linux
  pasta:
    executable: /usr/bin/pasta
    package: passt-0^20250320.g32f6212-2.fc41.x86_64
    version: ""
  remoteSocket:
    exists: true
    path: /run/user/1000/podman/podman.sock
  rootlessNetworkCmd: pasta
  security:
    apparmorEnabled: false
    capabilities: CAP_CHOWN,CAP_DAC_OVERRIDE,CAP_FOWNER,CAP_FSETID,CAP_KILL,CAP_NET_BIND_SERVICE,CAP_SETFCAP,CAP_SETGID,CAP_SETPCAP,CAP_SETUID,CAP_SYS_CHROOT
    rootless: true
    seccompEnabled: true
    seccompProfilePath: /usr/share/containers/seccomp.json
    selinuxEnabled: true
  serviceIsRemote: false
  slirp4netns:
    executable: ""
    package: ""
    version: ""
  swapFree: 8587046912
  swapTotal: 8589930496
  uptime: 175h 43m 43.00s (Approximately 7.29 days)
  variant: ""
plugins:
  authorization: null
  log:
  - k8s-file
  - none
  - passthrough
  - journald
  network:
  - bridge
  - macvlan
  - ipvlan
  volume:
  - local
registries:
  search:
  - registry.fedoraproject.org
  - registry.access.redhat.com
  - docker.io
store:
  configFile: /home/user/.config/containers/storage.conf
  containerStore:
    number: 24
    paused: 0
    running: 4
    stopped: 20
  graphDriverName: overlay
  graphOptions: {}
  graphRoot: /home/user/.local/share/containers/storage
  graphRootAllocated: 1022505254912
  graphRootUsed: 817701429248
  graphStatus:
    Backing Filesystem: btrfs
    Native Overlay Diff: "true"
    Supports d_type: "true"
    Supports shifting: "false"
    Supports volatile: "true"
    Using metacopy: "false"
  imageCopyTmpDir: /var/tmp
  imageStore:
    number: 119
  runRoot: /run/user/1000/containers
  transientStore: false
  volumePath: /home/user/.local/share/containers/storage/volumes
version:
  APIVersion: 5.4.2
  BuildOrigin: Fedora Project
  Built: 1743552000
  BuiltTime: Wed Apr  2 02:00:00 2025
  GitCommit: be85287fcf4590961614ee37be65eeb315e5d9ff
  GoVersion: go1.23.7
  Os: linux
  OsArch: linux/amd64
  Version: 5.4.2

Podman in a container

No

Privileged Or Rootless

Rootless

Upstream Latest Release

Yes

Additional environment details

No response

Additional information

No response

[ninja-quokka]

Hey @awmath, thanks for reporting! Closing this one as the other issue you opened: containers/podman-compose#1188 is the correct place to continue.