gentoo/guest: #8406 support systemd when configuring net

plugins/guests/gentoo/cap/configure_networks.rb

@@ -1,4 +1,5 @@
 require "tempfile"
+require "ipaddr"
 
 require_relative "../../../../lib/vagrant/util/template_renderer"
 
@@ -14,12 +15,46 @@ module VagrantPlugins
           commands   = []
           interfaces = machine.guest.capability(:network_interfaces, "/bin/ip")
 
+          networks.map! { |n| n[:device] = interfaces[n[:interface]]; n }
+
+          if comm.test('[[ `systemctl` =~ -\.mount ]]')
+            # Configure networking for Systemd
+
+            # convert netmasks to CIDR by converting to a binary string and counting the '1's
+            networks.map! { |n| n[:netmask] = IPAddr.new(n[:netmask]).to_i.to_s(2).count("1"); n }
+
+            # glob networks by device, so that we can write one file per device
+            # (result is hash[devicename] = [net, net, net...])
+            networks = networks.map { |n| [n[:device], n] }.reduce({}) { |h, (k, v)| (h[k] ||= []) << v; h }
+
+            # Write one .network file out for each device
+            networks.each_pair do |device_name, device_networks|
+              entry = TemplateRenderer.render('guests/gentoo/network_systemd', networks: device_networks)
+
+              filename = "50_vagrant_#{device_name}.network"
+              tmpfile = "/tmp/#{filename}"
+              destfile = "/etc/systemd/network/#{filename}"
+
+              Tempfile.open('vagrant-gentoo-configure-networks') do |f|
+                f.binmode
+                f.write(entry)
+                f.fsync
+                f.close
+                comm.upload(f.path, tmpfile)
+              end
+
+              commands << "mv #{tmpfile} #{destfile} && chmod 644 #{destfile}"
+            end
+
+            # tell systemd to reload the networking config
+            commands << 'systemctl daemon-reload && systemctl restart systemd-networkd.service'
+          else
+            # Configure networking for OpenRC
+
             # Remove any previous network additions to the configuration file.
             commands << "sed -i'' -e '/^#VAGRANT-BEGIN/,/^#VAGRANT-END/ d' /etc/conf.d/net"
 
             networks.each_with_index do |network, i|
-            network[:device] = interfaces[network[:interface]]
-
               entry = TemplateRenderer.render("guests/gentoo/network_#{network[:type]}",
                 options: network,
               )
@@ -44,6 +79,7 @@ module VagrantPlugins
                 /etc/init.d/net.#{network[:device]} start
               EOH
             end
+          end
 
           comm.sudo(commands.join("\n"))
         end

templates/guests/gentoo/network_systemd.erb

@@ -0,0 +1,16 @@
+[Match]
+Name=<%= networks[0][:device] %>
+
+[Network]
+<%- gateway = nil %>
+<%- networks.each do |net| %>
+<%-   if net[:type] == 'dhcp' %>
+DHCP=yes
+<%-   elsif net[:ip] %>
+Address=<%= net[:ip] %>/<%= net[:netmask] %>
+<%-   end %>
+<%-   gateway ||= net[:gateway] %>
+<%- end %>
+<%- if gateway %>
+Gateway=<%= gateway %>
+<%- end %>

test/unit/templates/guests/gentoo/systemd_network_test.rb

@@ -0,0 +1,73 @@
+require_relative "../../../base"
+
+require "vagrant/util/template_renderer"
+
+describe "templates/guests/gentoo/network_systemd" do
+  let(:template) { "guests/gentoo/network_systemd" }
+
+  it "renders the template with a static ip" do
+    result = Vagrant::Util::TemplateRenderer.render(template, networks: [{
+      device:  "eth0",
+      type:    "dhcp",
+    }])
+    expect(result).to eq <<-EOH.gsub(/^ {6}/, "")
+      [Match]
+      Name=eth0
+
+      [Network]
+      DHCP=yes
+    EOH
+  end
+
+  it "renders the template with multiple ips" do
+    result = Vagrant::Util::TemplateRenderer.render(template, networks: [{
+      device:  "eth0",
+      ip:      "1.1.1.1",
+      netmask: "16",
+    },{
+      device:  "eth0",
+      ip:      "1.1.2.2",
+      netmask: "16",
+    }])
+    expect(result).to eq <<-EOH.gsub(/^ {6}/, "")
+      [Match]
+      Name=eth0
+
+      [Network]
+      Address=1.1.1.1/16
+      Address=1.1.2.2/16
+    EOH
+  end
+
+  it "renders the template with a static ip" do
+    result = Vagrant::Util::TemplateRenderer.render(template, networks: [{
+      device:  "eth0",
+      ip:      "1.1.1.1",
+      netmask: "16",
+    }])
+    expect(result).to eq <<-EOH.gsub(/^ {6}/, "")
+      [Match]
+      Name=eth0
+
+      [Network]
+      Address=1.1.1.1/16
+    EOH
+  end
+
+  it "includes the gateway" do
+    result = Vagrant::Util::TemplateRenderer.render(template, networks: [{
+      device:  "eth0",
+      ip:      "1.1.1.1",
+      netmask: "16",
+      gateway: "1.2.3.4",
+    }])
+    expect(result).to eq <<-EOH.gsub(/^ {6}/, "")
+      [Match]
+      Name=eth0
+
+      [Network]
+      Address=1.1.1.1/16
+      Gateway=1.2.3.4
+    EOH
+  end
+end