[pve-devel] [PATCH container 1/2] fix #2044: add openwrt support

[Thomas Lamprecht]

no sign-off and zero commit message stating thoughts about design choices
(like just adding the last named configured vNIC which as single interface
to the CT network config?!) what openWRT is based on (e.g., that it basically
just uses busybox) and a, at least basic, pve-docs patch would be also good
to have..

On 08.11.21 14:43, Oguz Bektas wrote:
> ---
>  src/PVE/LXC/Setup.pm         |  4 ++
>  src/PVE/LXC/Setup/Makefile   |  1 +
>  src/PVE/LXC/Setup/OpenWrt.pm | 82 ++++++++++++++++++++++++++++++++++++

file/module name should be cased OpenWRT

>  3 files changed, 87 insertions(+)
>  create mode 100644 src/PVE/LXC/Setup/OpenWrt.pm
> 
> diff --git a/src/PVE/LXC/Setup.pm b/src/PVE/LXC/Setup.pm
> index 5cc56af..e89886f 100644
> --- a/src/PVE/LXC/Setup.pm
> +++ b/src/PVE/LXC/Setup.pm
> @@ -17,6 +17,7 @@ use PVE::LXC::Setup::Fedora;
>  use PVE::LXC::Setup::Gentoo;
>  use PVE::LXC::Setup::SUSE;
>  use PVE::LXC::Setup::Ubuntu;
> +use PVE::LXC::Setup::OpenWrt;
>  use PVE::LXC::Setup::Unmanaged;
>  
>  my $plugins = {
> @@ -28,6 +29,7 @@ my $plugins = {
>      fedora    => 'PVE::LXC::Setup::Fedora',
>      gentoo    => 'PVE::LXC::Setup::Gentoo',
>      opensuse  => 'PVE::LXC::Setup::SUSE',
> +    openwrt   => 'PVE::LXC::Setup::OpenWrt',
>      ubuntu    => 'PVE::LXC::Setup::Ubuntu',
>      unmanaged => 'PVE::LXC::Setup::Unmanaged',
>  };
> @@ -75,6 +77,8 @@ my $autodetect_type = sub {
>  	return "alpine";
>      } elsif (-f  "$rootdir/etc/gentoo-release") {
>  	return "gentoo";
> +    } elsif (-f "$rootdir/etc/openwrt_release") {
> +	return "openwrt";
>      } elsif (-f "$rootdir/etc/os-release") {
>  	die "unable to detect OS distribution\n";
>      } else {
> diff --git a/src/PVE/LXC/Setup/Makefile b/src/PVE/LXC/Setup/Makefile
> index 04ee2e4..22702ca 100644
> --- a/src/PVE/LXC/Setup/Makefile
> +++ b/src/PVE/LXC/Setup/Makefile
> @@ -9,6 +9,7 @@ SOURCES=\
>      Fedora.pm		\
>      Gentoo.pm		\
>      SUSE.pm		\
> +    OpenWrt.pm		\
>      Ubuntu.pm		\
>      Unmanaged.pm	\
>  
> diff --git a/src/PVE/LXC/Setup/OpenWrt.pm b/src/PVE/LXC/Setup/OpenWrt.pm
> new file mode 100644
> index 0000000..89ea740
> --- /dev/null
> +++ b/src/PVE/LXC/Setup/OpenWrt.pm
> @@ -0,0 +1,82 @@
> +package PVE::LXC::Setup::OpenWrt;
> +
> +use strict;
> +use warnings;
> +
> +use PVE::LXC;
> +use PVE::Network;
> +use File::Path;
> +
> +use PVE::LXC::Setup::Base;
> +use base qw(PVE::LXC::Setup::Base);
> +
> +my $known_versions = {
> +    '21.02.1' => 1,

so a simple upgrade from 21.02.1 -> 21.02.2 may already break CT start?

Busybox based CTs tend to be quite forgiving and not that likely to change,
so I'd not fatally die on an unknown (newer) version, maybe just checking
for > 21.02 would be enough of a safety net.

> +};
> +
> +sub new {
> +    my ($class, $conf, $rootdir) = @_;
> +
> +    my $version;
> +    my $release = PVE::Tools::file_get_contents("$rootdir/etc/openwrt_release");
> +    if ($release =~ m/^DISTRIB_RELEASE=\'(\d+\.\d+\.\d+)\'$/mi) {
> +	$version = $1;
> +    }
> +    die "unsupported OpenWrt version '$version'\n"
> +	if !$known_versions->{$version};
> +
> +    my $self = { conf => $conf, rootdir => $rootdir, version => $version };
> +
> +    $conf->{ostype} = "openwrt";
> +
> +    return bless $self, $class;
> +}
> +
> +sub template_fixup {
> +    my ($self, $conf) = @_;
> +}
> +
> +sub setup_init {
> +    my ($self, $conf) = @_;
> +}
> +
> +sub setup_network {
> +    my ($self, $conf) = @_;
> +
> +    my $d;
> +    foreach my $k (keys %$conf) {
> +	next if $k !~ m/^net(\d+)$/;
> +	$d = PVE::LXC::Config->parse_lxc_network($conf->{$k});
> +	next if !$d->{name};

what is this and why does it selects it a random (perl's `keys` is actively shuffling
stuff around) different netX config to use on each new start?!

I'd figure that such nondeterministic behavior would be rather confusing and undesired
for an user..

> +    }
> +
> +    my $proto = ($d->{ip} eq 'dhcp') ? 'dhcp' : 'static';
> +    my $ip = "";
> +    if ($proto eq 'static') {
> +	$ip = $d->{ip};
> +    }
> +
> +    my $data = <<"DATA";
> +config interface 'loopback'
> +	option proto 'static'
> +	option ipaddr '127.0.0.1'
> +	option netmask '255.0.0.0'
> +	option device 'lo'
> +
> +config interface 'wan'
> +	option proto '$proto'
> +	option device '$d->{name}'
> +	option ipaddr '$ip'
> +	option netmask '255.255.255.0'

so no IPv6 and not multiple interfaces and no dhcp (for testing)? I'd imagine that some
user may not be too happy with that, especially as they can configure such things without
any complaint from the backend, at least some good reasoning in a commit message and short
hints in code comments would be good _if_ we go for that overly simple config printer, I
mean we surely do not need to support all of openWRT, nor can't we, but at least a minimum
basic set of common used stuff would be nice, as would be multiple interfaces.


> +DATA
> +    $self->ct_file_set_contents("/etc/config/network", $data);
> +}
> +
> +# non systemd based containers work with pure cgroupv2
> +sub unified_cgroupv2_support {
> +    my ($self) = @_;
> +
> +    return 1;
> +}
> +
> +1
>