Startup fails with "unshare: mount ... on ... failed: Invalid argument"

[nzbr]

Bug description

When trying to start NixOS-WSL, it fails with an error like

[ERROR] systemd startup failed!
[ERROR] stderr:
unshare: mount /proc/455/ns/mnt on /run/nixos-wsl/ns/mount failed: Invalid argument
+ grep -q binfmt_misc /proc/filesystems
+ mount -t binfmt_misc binfmt_misc /proc/sys/fs/binfmt_misc
+ exec systemd
[ERROR] stdout:

To Reproduce

Update WSL to the new 2.0.0.0 release and try to start NixOS using syschdemd

Resolution

Run the following commands to update to the latest NixOS-WSL version and switch to native systemd:

wsl -d NixOS -e /nix/var/nix/profiles/system/sw/bin/bash

This shoudl give you a root shell in the NixOS distro. From there run:

/nix/var/nix/profiles/system/activate
. /etc/set-environment

Now update NixOS-WSL by running

rm -rf /etc/nixos/nixos-wsl
curl -L https://api.github.com/repos/nix-community/nixos-wsl/tarball/main | tar -xzv
mv nix-community-NixOS-WSL-* /etc/nixos/nixos-wsl
nix-channel --add https://nixos.org/channels/nixos-23.05 nixos
nix-channel --update

Use an Editor (nano/vim) to edit /etc/nixos/configuration.nix and set the option

    wsl.nativeSystemd = true;

Save the file and run (this will print some errors, but that's fine)

nixos-rebuild switch

After that, exit back to your windows shell and run

wsl -t NixOS
wsl -d NixOS

If this gives you a shell as the default user, everything should be working again

[fc1943s]

almost! error at the end of rebuild: (tried with an old installation and a fresh install)

[K900]

That's a warning, not an error.

[K900]

The actual issue is fixed on main, so I'll close the issue, but leave it pinned for visibility.

[nzbr]

Wouldn't it still fail with syschdemd? I'd not say it's fixed but rather no longer relevant (therefore the wontfix label)

[K900]

I fixed it on main.