Systemd-networkd overlay with IPV6 support

Signed-off-by: Timothy Middelkoop <tmiddelkoop@internet2.edu>

CHANGELOG.md

@@ -10,6 +10,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 - `wwclient.aarch64` overlay always provides an aarch64 wwclient executable.
 - `wwclient.x86_64` overlay always provides an x86_64 wwclient executable.
+- systemd-networkd overlay with IPv6 support
 
 ### Changed
 

overlays/systemd.networkd/internal/nodes-no-hwaddr.conf

@@ -0,0 +1,20 @@
+nodes:
+  node1:
+    network devices:
+      default:
+        device: wwnet0
+        ipaddr: 192.168.3.21
+        netmask: 255.255.255.0
+        gateway: 192.168.3.1
+        mtu: 1500
+      secondary:
+        device: wwnet1
+        ipaddr: 192.168.3.22
+        netmask: 255.255.255.0
+        gateway: 192.168.3.1
+        mtu: 9000
+        tags:
+          route1: "192.168.1.0/24,192.168.3.254"
+        ipaddr6: 2001:db8::23
+        prefixlen6: 64
+        gateway6: 2001:db8::1

overlays/systemd.networkd/internal/nodes.conf

@@ -0,0 +1,22 @@
+nodes:
+  node1:
+    network devices:
+      default:
+        device: wwnet0
+        hwaddr: e6:92:39:49:7b:03
+        ipaddr: 192.168.3.21
+        netmask: 255.255.255.0
+        gateway: 192.168.3.1
+        mtu: 1500
+      secondary:
+        device: wwnet1
+        hwaddr: 9a:77:29:73:14:f1
+        ipaddr: 192.168.3.22
+        netmask: 255.255.255.0
+        gateway: 192.168.3.1
+        mtu: 9000
+        tags:
+          route1: "192.168.1.0/24,192.168.3.254"
+        ipaddr6: 2001:db8::23
+        prefixlen6: 64
+        gateway6: 2001:db8::1

overlays/systemd.networkd/internal/systemd_networkd_test.go

@@ -0,0 +1,137 @@
+package systemd_networkd
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/warewulf/warewulf/internal/app/wwctl/overlay/show"
+	"github.com/warewulf/warewulf/internal/pkg/testenv"
+	"github.com/warewulf/warewulf/internal/pkg/wwlog"
+)
+
+func Test_systemdNetworkOverlay(t *testing.T) {
+	env := testenv.New(t)
+	defer env.RemoveAll()
+
+	env.ImportFile("var/lib/warewulf/overlays/systemd.networkd/rootfs/etc/systemd/network/default.network.ww", "../rootfs/etc/systemd/network/default.network.ww")
+
+	tests := []struct {
+		name       string
+		nodes_conf string
+		args       []string
+		log        string
+	}{
+		{
+			name:       "systemd.networkd with hwaddr",
+			nodes_conf: "nodes.conf",
+			args:       []string{"--render", "node1", "systemd.networkd", "etc/systemd/network/default.network.ww"},
+			log:        expected_log_with_hwaddr,
+		},
+		{
+			name:       "systemd.networkd without hwaddr",
+			nodes_conf: "nodes-no-hwaddr.conf",
+			args:       []string{"--render", "node1", "systemd.networkd", "etc/systemd/network/default.network.ww"},
+			log:        expected_log_without_hwaddr,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			env.ImportFile("etc/warewulf/nodes.conf", tt.nodes_conf)
+			cmd := show.GetCommand()
+			cmd.SetArgs(tt.args)
+			stdout := bytes.NewBufferString("")
+			stderr := bytes.NewBufferString("")
+			logbuf := bytes.NewBufferString("")
+			cmd.SetOut(stdout)
+			cmd.SetErr(stderr)
+			wwlog.SetLogWriter(logbuf)
+			err := cmd.Execute()
+			assert.NoError(t, err)
+			assert.Empty(t, stdout.String())
+			assert.Empty(t, stderr.String())
+			assert.Equal(t, tt.log, logbuf.String())
+		})
+	}
+}
+
+const expected_log_with_hwaddr string = `backupFile: true
+writeFile: true
+Filename: 10-ww4-networkd-default.network
+
+# This file is autogenerated by warewulf
+[Match]
+Name=wwnet0
+MACAddress=e6:92:39:49:7b:03
+
+[Network]
+DHCP=no
+Address=192.168.3.21/24
+Gateway=192.168.3.1
+[Link]
+MTUBytes=1500
+backupFile: true
+writeFile: true
+Filename: 10-ww4-networkd-secondary.network
+# This file is autogenerated by warewulf
+[Match]
+Name=wwnet1
+MACAddress=9a:77:29:73:14:f1
+
+[Network]
+DHCP=no
+Address=192.168.3.22/24
+Gateway=192.168.3.1
+IPv6PrivacyExtensions=false
+Address=2001:db8::23/64
+Gateway=2001:db8::1
+[Link]
+MTUBytes=9000
+
+[Route]
+Destination=192.168.1.0/24
+Gateway=192.168.3.254
+
+[DHCPv6]
+UseAddress=no
+`
+
+const expected_log_without_hwaddr string = `backupFile: true
+writeFile: true
+Filename: 10-ww4-networkd-default.network
+
+# This file is autogenerated by warewulf
+[Match]
+Name=wwnet0
+
+[Network]
+DHCP=no
+Address=192.168.3.21/24
+Gateway=192.168.3.1
+[Link]
+MTUBytes=1500
+backupFile: true
+writeFile: true
+Filename: 10-ww4-networkd-secondary.network
+# This file is autogenerated by warewulf
+[Match]
+Name=wwnet1
+
+[Network]
+DHCP=no
+Address=192.168.3.22/24
+Gateway=192.168.3.1
+IPv6PrivacyExtensions=false
+Address=2001:db8::23/64
+Gateway=2001:db8::1
+[Link]
+MTUBytes=9000
+
+[Route]
+Destination=192.168.1.0/24
+Gateway=192.168.3.254
+
+[DHCPv6]
+UseAddress=no
+`

overlays/systemd.networkd/rootfs/etc/systemd/network/default.network.ww

@@ -0,0 +1,55 @@
+{{- range $devname, $netdev := .ThisNode.NetDevs }}
+{{ file (print "10-ww4-networkd-" $devname  ".network") }}
+# This file is autogenerated by warewulf
+[Match]
+{{- if $netdev.Device }}
+Name={{ $netdev.Device }}
+{{- end }}
+{{- if $netdev.Hwaddr }}
+MACAddress={{ $netdev.Hwaddr }}
+{{- end }}
+
+[Network]
+{{- if or $netdev.IpCIDR $netdev.IpCIDR6 }}
+DHCP=no
+{{- end }}
+{{- if $netdev.IpCIDR }}
+Address={{ $netdev.IpCIDR }}
+{{- end }}
+{{- if $netdev.Gateway }}
+Gateway={{ $netdev.Gateway }}
+{{- end }}
+{{- if $netdev.IpCIDR6 }}
+IPv6PrivacyExtensions=false
+Address={{ $netdev.IpCIDR6 }}
+{{- end }}
+{{- if $netdev.Gateway6 }}
+Gateway={{ $netdev.Gateway6 }}
+{{- end }}
+{{- range $tk, $tv := $netdev.Tags }}
+{{- if regexMatch "^DNS[0-9]*$" $tk }}
+DNS={{ $tv }}
+{{- end }}
+{{- end }}
+
+{{- if $netdev.MTU }}
+[Link]
+MTUBytes={{ $netdev.MTU }}
+{{- end }}
+{{- range $tk, $tv := $netdev.Tags }}
+{{- if eq (substr 0 5 $tk) "route" }}
+{{- $route := splitList "," $tv }}
+
+[Route]
+Destination={{ index $route 0 }}
+Gateway={{ index $route 1 }}
+{{- end }}
+{{- end }}
+
+{{- if $netdev.Ipaddr6 }}
+
+[DHCPv6]
+UseAddress=no
+{{ end -}}
+
+{{ end -}}