[pve-devel] [PATCH pve-manager] API2 : Network : add network config reload

[Alexandre Derumier]

This add a new api to online reload networking configuration
with ifupdown2.

This work with native ifupdown2 modules, as ifupdown2 have
interface dependency relationships.

an optional "restart" param is available, for non native modules
like openvswitch.
---
 PVE/API2/Network.pm | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/PVE/API2/Network.pm b/PVE/API2/Network.pm
index 92256863..3fb71617 100644
--- a/PVE/API2/Network.pm
+++ b/PVE/API2/Network.pm
@@ -471,6 +471,71 @@ __PACKAGE__->register_method({
    }});
 
 __PACKAGE__->register_method({
+    name => 'reload_network_config', 
+    path => '', 
+    method => 'PUT',
+    permissions => {
+	check => ['perm', '/nodes/{node}', [ 'Sys.Modify' ]],
+    },
+    description => "Reload network configuration",
+    protected => 1,
+    proxyto => 'node',
+    parameters => {
+    	additionalProperties => 0,
+	properties => {
+	    node => get_standard_option('pve-node'),
+	    restart => {
+		type => 'boolean',
+		description => "restart networking.",
+		optional => 1,
+	    }
+	},
+    },
+    returns => { type => "null" },
+    code => sub {
+
+	my ($param) = @_;
+
+	my $action = $param->{restart} ? "restart" : "reload";
+	my $current_config_file = "/etc/network/interfaces";
+	my $new_config_file = "/etc/network/interfaces.new";
+
+	raise_param_exc({ config => "you need ifupdown2 to $action networking" }) if !-e '/usr/share/ifupdown2';
+	raise_param_exc({ config => "no new network config to apply" }) if !-e $new_config_file;
+
+	my $tmp = PVE::INotify::read_file('interfaces', 1);
+	my $config = $tmp->{data};
+	my $changes = $tmp->{changes};
+
+	raise_param_exc({ config => "no changes detected" }) if !$changes;
+
+	my $ovs_changes = undef;
+	my $bridges_delete = {};
+	my @lines = split(/\n/, $changes);
+	foreach my $line (@lines) {
+	   if($line =~ m/^\-iface\s(vmbr(\S+))/) {
+		$bridges_delete->{$1} = 1;
+	   } elsif ($line =~ m/ovs_type/) {
+		$ovs_changes = 1;
+	   } 
+	}
+
+	raise_param_exc({ config => "reloading config with ovs changes is not possible currently, please use restart" }) 
+	    if $ovs_changes && !$param->{restart};
+
+	#fixme : restart : check if vm are running on bridge, and try to reattach them ?
+	raise_param_exc({ config => "restart config with bridge delete is not possible currently, please use reload" }) 
+	    if keys %$bridges_delete && $param->{restart};
+
+	PVE::Tools::file_copy($new_config_file, $current_config_file);
+	unlink $new_config_file;
+
+	PVE::Tools::run_command(['systemctl', $action, 'networking']);
+
+	return undef;
+   }});
+
+__PACKAGE__->register_method({
     name => 'delete_network', 
     path => '{iface}', 
     method => 'DELETE',
-- 
2.11.0