Filepath Conversion issue when running podman machine's in WSL2 and volumes/tmpfs

[dixonwille]

Is this a BUG REPORT or FEATURE REQUEST? (leave only one on its own line)

/kind bug

Description

On a freshly installed VM using podman machine init, I get errors reporting that relative paths are not accepted.

Steps to reproduce the issue:

Case 1: Easiest way to reproduce is below.

1. podman machine init
2. podman run --tmpfs /tmp hello-world

Case 2: An alternative to --tmpfs is trying to mount any directory from VM to container (not worried about from host yet).

1. podman machine init
2. podman run -v /mnt/c/Users/wdixon/tmp/testing:/somelocation hello-world

Describe the results you received:

Case 1: Error: invalid container path "\\tmp", must be an absolute path
Case 2: Error: statfs /home/user/C:\mnt\c\Users\wdixon\tmp\testing: no such file or directory

Describe the results you expected:

I would expect the paths in both cases not to have backslashes when on the agent and instead use the forward slash.

I was not expecting my volume for host to be prefixed with /home/user/C: either. Not sure if I am missing something in the documentation around how the VMs are setup or not.

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

Sneaky suspicion that Podman remote client is doing a filepath.Clean or even a filepath.Join in the case of the volume case but I don't know enough about the codebase to be able to navigate quickly through to suggest a fix. https://github.com/containers/podman/blob/main/libpod/container_path_resolution.go seemed promising but couldn't find the exact "invalid container path X must be an absolute path" error message there.

Case 1: Raw Output

time="2022-03-29T22:10:32-04:00" level=info msg="C:\\Program Files\\RedHat\\Podman\\podman.exe filtering at log level trace"
time="2022-03-29T22:10:32-04:00" level=debug msg="Called run.PersistentPreRunE(C:\\Program Files\\RedHat\\Podman\\podman.exe --log-level trace run --tmpfs /tmp hello-world)"
time="2022-03-29T22:10:32-04:00" level=debug msg="SSH Ident Key \"C:\\\\Users\\\\wdixon\\\\.ssh\\\\podman-machine-default\" SHA256:WiFJx7Xd7HxLIxeGLgF8K+AM4/cqhb/ytwBvikzWUPU ssh-ed25519"
time="2022-03-29T22:10:32-04:00" level=debug msg="DoRequest Method: GET URI: http://d/v4.0.2/libpod/_ping"
time="2022-03-29T22:10:32-04:00" level=warning msg="Failed to retrieve default tmp dir: invalid image_copy_tmp_dir value \"/var/tmp\" (relative paths are not accepted)"
time="2022-03-29T22:10:32-04:00" level=debug msg="Loading registries configuration \"/etc/containers/registries.conf\""
time="2022-03-29T22:10:32-04:00" level=debug msg="DoRequest Method: POST URI: http://d/v4.0.2/libpod/images/pull"
time="2022-03-29T22:10:32-04:00" level=debug msg="DoRequest Method: POST URI: http://d/v4.0.2/libpod/containers/create"
Error: invalid container path "\\tmp", must be an absolute path

Case 2: Raw Output

time="2022-03-29T22:08:36-04:00" level=info msg="C:\\Program Files\\RedHat\\Podman\\podman.exe filtering at log level trace"
time="2022-03-29T22:08:36-04:00" level=debug msg="Called run.PersistentPreRunE(C:\\Program Files\\RedHat\\Podman\\podman.exe --log-level trace run -v /mnt/c/Users/wdixon/tmp/testing:/somelocation hello-world)"
time="2022-03-29T22:08:36-04:00" level=debug msg="SSH Ident Key \"C:\\\\Users\\\\wdixon\\\\.ssh\\\\podman-machine-default\" SHA256:WiFJx7Xd7HxLIxeGLgF8K+AM4/cqhb/ytwBvikzWUPU ssh-ed25519"
time="2022-03-29T22:08:36-04:00" level=debug msg="DoRequest Method: GET URI: http://d/v4.0.2/libpod/_ping"
time="2022-03-29T22:08:36-04:00" level=warning msg="Failed to retrieve default tmp dir: invalid image_copy_tmp_dir value \"/var/tmp\" (relative paths are not accepted)"
time="2022-03-29T22:08:36-04:00" level=debug msg="Loading registries configuration \"/etc/containers/registries.conf\""
time="2022-03-29T22:08:36-04:00" level=debug msg="DoRequest Method: POST URI: http://d/v4.0.2/libpod/images/pull"
time="2022-03-29T22:08:36-04:00" level=debug msg="User mount /mnt/c/Users/wdixon/tmp/testing:/somelocation options []"
time="2022-03-29T22:08:36-04:00" level=debug msg="DoRequest Method: POST URI: http://d/v4.0.2/libpod/containers/create"
Error: statfs /home/user/C:\mnt\c\Users\wdixon\tmp\testing: no such file or directory

Output of podman version:

Client:       Podman Engine
Version:      4.0.2
API Version:  4.0.2
Go Version:   go1.18rc1
Git Commit:   342c8259381b63296e96ad29519bd4b9c7afbf97
Built:        Wed Mar  2 15:28:30 2022
OS/Arch:      windows/amd64

Server:       Podman Engine
Version:      4.0.2
API Version:  4.0.2
Go Version:   go1.16.14

Built:      Thu Mar 10 15:26:05 2022
OS/Arch:    linux/amd64

Output of podman info --debug:

host:
  arch: amd64
  buildahVersion: 1.24.1
  cgroupControllers: []
  cgroupManager: cgroupfs
  cgroupVersion: v1
  conmon:
    package: conmon-2.1.0-2.fc35.x86_64
    path: /usr/bin/conmon
    version: 'conmon version 2.1.0, commit: '
  cpus: 24
  distribution:
    distribution: fedora
    variant: container
    version: "35"
  eventLogger: file
  hostname: DIXON-DESKTOP
  idMappings:
    gidmap:
    - container_id: 0
      host_id: 1000
      size: 1
    - container_id: 1
      host_id: 100000
      size: 65536
    uidmap:
    - container_id: 0
      host_id: 1000
      size: 1
    - container_id: 1
      host_id: 100000
      size: 65536
  kernel: 5.10.16.3-microsoft-standard-WSL2
  linkmode: dynamic
  logDriver: journald
  memFree: 32857559040
  memTotal: 33548242944
  networkBackend: netavark
  ociRuntime:
    name: crun
    package: crun-1.4.3-1.fc35.x86_64
    path: /usr/bin/crun
    version: |-
      crun version 1.4.3
      commit: 61c9600d1335127eba65632731e2d72bc3f0b9e8
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +CRIU +YAJL
  os: linux
  remoteSocket:
    exists: true
    path: /run/user/1000/podman/podman.sock
  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: false
  serviceIsRemote: true
  slirp4netns:
    executable: /usr/bin/slirp4netns
    package: slirp4netns-1.1.12-2.fc35.x86_64
      slirp4netns version 1.1.12
      commit: 7a104a101aa3278a2152351a082a6df71f57c9a3
      libslirp: 4.6.1
      SLIRP_CONFIG_VERSION_MAX: 3
      libseccomp: 2.5.3
  swapFree: 8589660160
  swapTotal: 8589934592
  uptime: 29m 34.98s
plugins:
  log:
  - k8s-file
  - none
  - passthrough
  - journald
  network:
  - bridge
  - macvlan
  volume:
  - local
registries:
  search:
  - registry.fedoraproject.org
  - registry.access.redhat.com
  - docker.io
  - quay.io
store:
  configFile: /home/user/.config/containers/storage.conf
  containerStore:
    number: 0
    paused: 0
    running: 0
    stopped: 0
  graphDriverName: overlay
  graphOptions:
    overlay.mount_program:
      Executable: /usr/bin/fuse-overlayfs
      Package: fuse-overlayfs-1.7.1-2.fc35.x86_64
      Version: |-
        fusermount3 version: 3.10.5
        fuse-overlayfs: version 1.7.1
        FUSE library version 3.10.5
        using FUSE kernel interface version 7.31
  graphRoot: /home/user/.local/share/containers/storage
  graphStatus:
    Backing Filesystem: extfs
    Native Overlay Diff: "false"
    Supports d_type: "true"
    Using metacopy: "false"
  imageCopyTmpDir: /var/tmp
  imageStore:
    number: 1
  runRoot: /run/user/1000/containers
  volumePath: /home/user/.local/share/containers/storage/volumes
version:
  APIVersion: 4.0.2
  Built: 1646943965
  BuiltTime: Thu Mar 10 15:26:05 2022
  GitCommit: ""
  GoVersion: go1.16.14
  OsArch: linux/amd64
  Version: 4.0.2

Package info (e.g. output of rpm -q podman or apt list podman):

N/A as I went to Github releases, downloaded the v4.0.2 MSI and installed that way.

Have you tested with the latest version of Podman and have you checked the Podman Troubleshooting Guide? (https://github.com/containers/podman/blob/main/troubleshooting.md)

Yes

Additional environment details (AWS, VirtualBox, physical, etc.):

Host: Windows 11
VM: WSL2 using podman machine init

[n1hility]

Volume support is not yet fully implemented but on my TODO after I get back (away this week) I have a preliminary client side approach available here if you want to try it out [1], but we need more for detecting and handling docker api clients on the server side. Although, docker clients do work today if you use a /mnt/c/foo/bar convention.

[1] https://github.com/n1hility/podman/tree/client-win-mounts

[dixonwille]

I'll check it out thanks for the heads up. Wasn't sure what is/isn't supported considering the WSL2 changes were so recent.