[pve-devel] [PATCH container 2/2] setup: add helper to disable static units when fixing up templates

[Thomas Lamprecht]

Am 08/11/2024 um 14:18 schrieb Fabian Grünbichler:
> modelled after setup_systemd_preset, which unfortunately doesn't work for
> static units, since those are skipped by `systemctl preset-all` which runs on
> first boot.
> 
> our Debian-based templates already come with those masking symlinks in place.

yeah, I added symlinking those units to /dev/null in the DAB and AAB
image builders, but thanks for providing the generic way.

> 
> Signed-off-by: Fabian Grünbichler <f.gruenbichler at proxmox.com>
> ---
> 
> Notes:
>     noticed while testing the openEuler template
> 
>  src/PVE/LXC/Setup/Base.pm      | 23 +++++++++++++++++++++++
>  src/PVE/LXC/Setup/CentOS.pm    |  2 ++
>  src/PVE/LXC/Setup/OpenEuler.pm |  1 +
>  3 files changed, 26 insertions(+)
> 
> diff --git a/src/PVE/LXC/Setup/Base.pm b/src/PVE/LXC/Setup/Base.pm
> index 084b039..decd62a 100644
> --- a/src/PVE/LXC/Setup/Base.pm
> +++ b/src/PVE/LXC/Setup/Base.pm
> @@ -352,6 +352,29 @@ sub setup_systemd_preset {
>      );
>  }
>  
> +# some units cannot be disabled via presets because they are static
> +# this helper can be called as part of template_fixup to explicitly mask them instead
> +sub setup_systemd_disable_static_units {
> +    my ($self, $extra_units) = @_;
> +
> +    # some don't make sense in CTs, child-plugins can add extra units via $extra_preset
> +    my $units = [
> +	'sys-kernel-config.mount',
> +	'sys-kernel-debug.mount',
> +    ];
> +
> +    if (defined($extra_units)) {
> +	for my $unit (@$extra_units) {
> +	    push @$units, $unit;
> +	}
> +    }
> +

would apply this with the following squashed in as there's no need for
allocations/copies here, if you have no objection?

diff --git a/src/PVE/LXC/Setup/Base.pm b/src/PVE/LXC/Setup/Base.pm
index decd62a..bb084af 100644
--- a/src/PVE/LXC/Setup/Base.pm
+++ b/src/PVE/LXC/Setup/Base.pm
@@ -363,13 +363,7 @@ sub setup_systemd_disable_static_units {
        'sys-kernel-debug.mount',
     ];
 
-    if (defined($extra_units)) {
-       for my $unit (@$extra_units) {
-           push @$units, $unit;
-       }
-    }
-
-    for my $unit (@$units) {
+    for my $unit ($units->@*, $extra_units->@*) {
        $self->ct_symlink('/dev/null', "/etc/systemd/system/$unit")
            if !$self->ct_file_exists("/etc/systemd/system/$unit");
     }