[pve-devel] [PATCH container v2 2/4] seccomp config: adapt to new lxc-syscalld runtime directory

[Fabian Grünbichler]

On July 23, 2025 4:40 pm, Fiona Ebner wrote:
> The lxc-syscalld now uses a different runtime directory. Its old
> runtime directory was /run/pve, which was also used for other things,
> e.g. storage tunnel and mtunnel sockets and container stderr logs as
> well as pull metrics. The fact that it would be recreated on service
> restart is problematic, so the runtime directory was changed.
> 
> Note that this configuration is only used for containers with the
> experimental 'mknod' feature enabled.
> 
> For already running containers, a symbolic link is put into place by
> the new version of pve-lxc-syscalld, but newly started ones should
> always use the new socket path as soon as it is available. Only use
> the old socket path if the old version of pve-lxc-syscalld is still
> used. The heuristic to check this is:
> 1. the new socket path doesn't exist
> 2. the old socket path exists
> 3. the old socket path is not a symbolic link

couldn't this be solved by adding a versioned depends, instead of
breaking the other direction which is not actually required because of
the compat symlink?

> 
> Signed-off-by: Fiona Ebner <f.ebner at proxmox.com>
> ---
> 
> Changes in v2:
> * adapt to shortened socket path
> 
>  src/PVE/LXC.pm | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/src/PVE/LXC.pm b/src/PVE/LXC.pm
> index 741bb33..a236b5a 100644
> --- a/src/PVE/LXC.pm
> +++ b/src/PVE/LXC.pm
> @@ -534,7 +534,15 @@ sub make_seccomp_config {
>              die "'mknod' feature requested, but kernel too old (found $kernel, required >= 5.3)\n";
>          }
>  
> -        $raw_conf .= "lxc.seccomp.notify.proxy = unix:/run/pve/lxc-syscalld.sock\n";
> +        # TODO PVE 10 - always use new socket path
> +        my $old_socket_path = '/run/pve/lxc-syscalld.sock';
> +        my $new_socket_path = '/run/pve-lxc-syscalld/socket';
> +
> +        if (!-e $new_socket_path && -e $old_socket_path && !-l $old_socket_path) {
> +            $raw_conf .= "lxc.seccomp.notify.proxy = unix:$old_socket_path\n";
> +        } else {
> +            $raw_conf .= "lxc.seccomp.notify.proxy = unix:$new_socket_path\n";
> +        }
>          $raw_conf .= "lxc.seccomp.notify.cookie = $vmid\n";
>  
>          $rules->{mknod} = [
> -- 
> 2.47.2
> 
> 
> 
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