[Bug]: failed to spawn the command: no such file or directory (OS error 2)

[nerditation]

Describe the bug

I tried to enable distrod in an newly installed opensuse tumbleweed wsl instance, but I got this error, so I disabled distrod and try to troubleshoot following instructions in #9, I got the same error after many attempt, even when I try to execute the simplest command I can think of:

sudo /opt/distrod/bin/distrod-exec /bin/true true

Steps to reproduce

install opensuse-tumbleweed, from https://aka.ms/wsl-opensuse-tumbleweed
install distrod
sudo /opt/distrod/bin/distrod enable
restart wsl instance

Expected behavior

open login shell

Windows version

windows 10 22H2 (OS build 19045.2965)

Linux kernel version

Linux LAPTOP 5.15.90.1-microsoft-standard-WSL2 #1 SMP Fri Jan 27 02:56:13 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

Distro

opensuse-tumbleweed

How did you install that distro?

Enabled distrod in an existing WSL2 distro

Logs

~> sudo /opt/distrod/bin/distrod-exec /bin/true true
[Distrod][DEBUG] distrod-exec: exec_command_in_distro
[Distrod][DEBUG] starting /init from distrod-exec
[Distrod][DEBUG] WSL envs: "WSL_INTEROP" = "/run/WSL/58_interop"
[Distrod][DEBUG] WSL envs: "WSL_DISTRO_NAME" = "openSUSE-Tumbleweed"
[Distrod][DEBUG] WSL envs: "WSLENV" = "TERM:COLORTERM:TERM_PROGRAM:TERM_PROGRAM_VERSION"
[Distrod][DEBUG] Container::with_mount source: Some(HostPath("/run/distrod/cmdline")), target: ContainerPath("/proc/cmdline"), fstype: None, flags: MS_BIND, is_file: true
[Distrod][TRACE] mount_distrod_run_files: path: "/opt/distrod/run/systemd"
[Distrod][TRACE] mount_distrod_run_files: path: "/opt/distrod/run/systemd/system"
[Distrod][TRACE] mount_distrod_run_files: path: "/opt/distrod/run/systemd/system/portproxy.service"
[Distrod][DEBUG] Container::with_mount source: Some(HostPath("/opt/distrod/run/systemd/system/portproxy.service")), target: ContainerPath("/run/systemd/system/portproxy.service"), fstype: None, flags: MS_BIND, is_file: true
[Distrod][TRACE] mount_distrod_run_files: path: "/opt/distrod/run/systemd/system/systemd-tmpfiles-clean.service.d"
[Distrod][TRACE] mount_distrod_run_files: path: "/opt/distrod/run/systemd/system/systemd-tmpfiles-clean.service.d/exclude_wslg_sockets.conf"
[Distrod][DEBUG] Container::with_mount source: Some(HostPath("/opt/distrod/run/systemd/system/systemd-tmpfiles-clean.service.d/exclude_wslg_sockets.conf")), target: ContainerPath("/run/systemd/system/systemd-tmpfiles-clean.service.d/exclude_wslg_sockets.conf"), fstype: None, flags: MS_BIND, is_file: true
[Distrod][TRACE] mount_distrod_run_files: path: "/opt/distrod/run/systemd/system/systemd-tmpfiles-setup.service.d"
[Distrod][TRACE] mount_distrod_run_files: path: "/opt/distrod/run/systemd/system/systemd-tmpfiles-setup.service.d/exclude_wslg_sockets.conf"
[Distrod][DEBUG] Container::with_mount source: Some(HostPath("/opt/distrod/run/systemd/system/systemd-tmpfiles-setup.service.d/exclude_wslg_sockets.conf")), target: ContainerPath("/run/systemd/system/systemd-tmpfiles-setup.service.d/exclude_wslg_sockets.conf"), fstype: None, flags: MS_BIND, is_file: true
[Distrod][TRACE] mount_distrod_run_files: path: "/opt/distrod/run/tmpfiles.d"
[Distrod][TRACE] mount_distrod_run_files: path: "/opt/distrod/run/tmpfiles.d/x11.conf"
[Distrod][DEBUG] Container::with_mount source: Some(HostPath("/mnt/wslg/.X11-unix")), target: ContainerPath("/tmp/.X11-unix"), fstype: None, flags: MS_BIND, is_file: false
[Distrod][DEBUG] DistroLauncher::launch
[Distrod][DEBUG] Container::with_mount source: Some(HostPath("/run/distrod/distrod_wsl_env-uid0")), target: ContainerPath("/run/distrod/distrod_wsl_env-uid0"), fstype: None, flags: MS_BIND, is_file: true
[Distrod][DEBUG] Spawning the command or the waiter.
[Distrod][TRACE] mounting source: Some(
    ContainerPath(
        "/run/distrod/cmdline",
    ),
), mount: ContainerMount { source: Some(HostPath("/run/distrod/cmdline")), target: ContainerPath("/proc/cmdline"), fstype: None, flags: MS_BIND, data: None, is_file: true }
[Distrod][DEBUG] Executing a command in the distro.
[Distrod][DEBUG] Failed to ignore signal Sys(EINVAL)
[Distrod][TRACE] mounting source: Some(
    ContainerPath(
        "/opt/distrod/run/systemd/system/portproxy.service",
    ),
), mount: ContainerMount { source: Some(HostPath("/opt/distrod/run/systemd/system/portproxy.service")), target: ContainerPath("/run/systemd/system/portproxy.service"), fstype: None, flags: MS_BIND, data: None, is_file: true }
[Distrod][DEBUG] Failed to ignore signal Sys(EINVAL)
[Distrod][TRACE] mounting source: Some(
    ContainerPath(
        "/opt/distrod/run/systemd/system/systemd-tmpfiles-clean.service.d/exclude_wslg_sockets.conf",
    ),
), mount: ContainerMount { source: Some(HostPath("/opt/distrod/run/systemd/system/systemd-tmpfiles-clean.service.d/exclude_wslg_sockets.conf")), target: ContainerPath("/run/systemd/system/systemd-tmpfiles-clean.service.d/exclude_wslg_sockets.conf"), fstype: None, flags: MS_BIND, data: None, is_file: true }
[Distrod][DEBUG] Distro::exec_command.
[Distrod][TRACE] mounting source: Some(
    ContainerPath(
        "/opt/distrod/run/systemd/system/systemd-tmpfiles-setup.service.d/exclude_wslg_sockets.conf",
    ),
), mount: ContainerMount { source: Some(HostPath("/opt/distrod/run/systemd/system/systemd-tmpfiles-setup.service.d/exclude_wslg_sockets.conf")), target: ContainerPath("/run/systemd/system/systemd-tmpfiles-setup.service.d/exclude_wslg_sockets.conf"), fstype: None, flags: MS_BIND, data: None, is_file: true }
[Distrod][DEBUG] Container::exec_command.
[Distrod][TRACE] mounting source: Some(
    ContainerPath(
        "/mnt/wslg/.X11-unix",
    ),
), mount: ContainerMount { source: Some(HostPath("/mnt/wslg/.X11-unix")), target: ContainerPath("/tmp/.X11-unix"), fstype: None, flags: MS_BIND, data: None, is_file: false }
[Distrod][DEBUG] Triple fork done.
[Distrod][DEBUG] dropping privilege. kmsg logging in the child ends here.
[Distrod][DEBUG] The parent of the second of three forks exits.
[Distrod][DEBUG] Spawning the command or the waiter.
[Distrod][DEBUG] Spawning the waiter.
[Distrod][DEBUG] Failed to ignore signal Sys(EINVAL)
[Distrod][DEBUG] Failed to ignore signal Sys(EINVAL)
[Distrod][TRACE] skipping an identical mount: Some(
    ContainerPath(
        "/run/distrod/distrod_wsl_env-uid0",
    ),
), ContainerMount {
    source: Some(
        HostPath(
            "/run/distrod/distrod_wsl_env-uid0",
        ),
    ),
    target: ContainerPath(
        "/run/distrod/distrod_wsl_env-uid0",
    ),
    fstype: None,
    flags: MS_BIND,
    data: None,
    is_file: true,
}
nerditation@PENG-PRO-LAPTOP:~> [Distrod][ERROR] Failed to spawn the command.

Caused by:
    No such file or directory (os error 2)

additional comment

I enabled distrod in another debian-stable wsl instance and it works fine. I don't know what's the difference between the distros and how to fix it.

[nerditation]

since wsl2 now has built in support for systemd, I'll close this issue.

just for the reference, it turns out opensuse by default doesn't have a /sbin/init symlink, which should point to /usr/lib/systemd/systemd. but distrod assumes /sbin/init always exists so it panics.

if I manually create the symlink, it will work fine. alternatively, zypper install wsl_systemd would also solve the crash, because the package wsl_systemd actually creates the symlink (and contains a /etc/wsl.conf config file to enable the built in systemd support).