Futher flesh out the generator

- Create a per-host directory called overlays/$(overlay)/hostname/$(host.hostname) to have files that
  ought to be included only for that host. Things like /etc/vpp/config/interface.vpp go there
- Rename the "templates" directory as overlays/$(overlay)/common/
- Render one after the other, so a file can exist in common and hostname, the latter taking precedence
- Remove the config for 'pubkeys' and instead just make these common/root/.ssh/* and common/home/ipng/.ssh/*
- Split out bootstrap.vpp so that a per-host include can be overriden for interfaces.vpp
  - But keep a default common/etc/vpp/config/interface.vpp as a placeholder, so that VPP will still start
    even if the per-hostname override isn't provided.
- Generate a fresh output for 'default' on all machines

overlays/bird/common/etc/bird/bfd.conf.j2

@@ -0,0 +1,6 @@
+protocol bfd bfd1 {
+  interface "e*" {
+    interval 100 ms;
+    multiplier 20;
+  };
+}

overlays/bird/common/etc/bird/bird.conf.j2

@@ -0,0 +1,19 @@
+router id {{ node.loopback.ipv4.split("/")[0] }};
+
+protocol device { scan time 30; }
+protocol direct { ipv4; ipv6; check link yes; }
+protocol kernel kernel4 {
+  ipv4 { import none; export where source != RTS_DEVICE; };
+  learn off;
+  scan time 300;
+}
+protocol kernel kernel6 {
+  ipv6 { import none; export where source != RTS_DEVICE; };
+  learn off;
+  scan time 300;
+}
+
+include "static.conf";
+include "bfd.conf";
+include "ospf.conf";
+include "ibgp.conf";

overlays/bird/common/etc/bird/ibgp.conf.j2

@@ -0,0 +1 @@
+# NOTE(ipng): Not created yet

overlays/bird/common/etc/bird/ospf.conf.j2

@@ -0,0 +1,21 @@
+protocol ospf v2 ospf4 {
+  ipv4 { export where source = RTS_DEVICE; import all; };
+  area 0 {
+    interface "loop0" { stub yes; };
+    interface "e0" { type pointopoint; cost 5; bfd off; };
+    interface "e1" { type pointopoint; cost 5; bfd off; };
+    interface "e2" { type pointopoint; cost 5; bfd off; };
+    interface "e3" { type pointopoint; cost 5; bfd off; };
+  };
+}
+
+protocol ospf v3 ospf6 {
+  ipv6 { export where source = RTS_DEVICE; import all; };
+  area 0 {
+    interface "loop0" { stub yes; };
+    interface "e0" { type pointopoint; cost 5; bfd off; };
+    interface "e1" { type pointopoint; cost 5; bfd off; };
+    interface "e2" { type pointopoint; cost 5; bfd off; };
+    interface "e3" { type pointopoint; cost 5; bfd off; };
+  };
+}

overlays/bird/common/etc/bird/static.conf.j2

@@ -0,0 +1,11 @@
+protocol static static4 {
+  ipv4 { export all; };
+#  route 192.0.2.0/24 via 10.0.0.1;
+  route {{lab.ipv4}} unreachable;
+}
+
+protocol static static6 {
+  ipv6 { export all; };
+#  route 2001:db8:cafe::/48 via 2001:db8::1;;
+  route {{lab.ipv6}} unreachable;
+}

overlays/bird/common/etc/hostname.j2

@@ -0,0 +1 @@
+{{ node.hostname }}

overlays/bird/common/etc/hosts.j2

@@ -0,0 +1,7 @@
+127.0.0.1       localhost
+127.0.1.1       {{node.hostname}}.lab.ipng.ch  {{node.hostname}}
+
+# The following lines are desirable for IPv6 capable hosts
+::1     localhost ip6-localhost ip6-loopback
+ff02::1 ip6-allnodes
+ff02::2 ip6-allrouters

overlays/bird/common/etc/netplan/01-netcfg.yaml.j2

@@ -0,0 +1,14 @@
+network:
+  version: 2
+  renderer: networkd
+  ethernets:
+    enp1s0:
+      optional: true
+      accept-ra: false
+      dhcp4: false
+      addresses: [ {{node.mgmt.ipv4}}, {{node.mgmt.ipv6}} ]
+      gateway4: {{lab.mgmt.gw4}}
+      gateway6: {{lab.mgmt.gw6}}
+      nameservers:
+        addresses: [ "2001:678:d78::3", "2001:678:d78::4" ]
+        search: [ "lab.ipng.ch", "ipng.ch", "ipng.nl", "rfc1918.ipng.nl" ]

overlays/bird/common/etc/vpp/bootstrap.vpp.j2

@@ -0,0 +1,8 @@
+comment { Apply system defaults from the build }
+exec /etc/vpp/config/defaults.vpp
+exec /etc/vpp/config/loopback.vpp
+exec /etc/vpp/config/interface.vpp
+exec /etc/vpp/config/lcp.vpp
+
+comment { Allow user to set persistent manual configs }
+exec /etc/vpp/config/manual.vpp

overlays/bird/common/etc/vpp/config/defaults.vpp

@@ -0,0 +1,4 @@
+set logging class linux-cp rate-limit 1000 level warn syslog-level notice
+lcp default netns dataplane
+lcp lcp-sync on
+lcp lcp-auto-subint off

overlays/bird/common/etc/vpp/config/interface.vpp.j2

@@ -0,0 +1 @@
+comment { This file is overridden by blobs/{{node.hostname}}/etc/vpp/config/interfaces.vpp }

overlays/bird/common/etc/vpp/config/lcp.vpp

@@ -0,0 +1,6 @@
+comment { Create one LinuxCP Interface Pair for each phy }
+lcp create loop0 host-if loop0
+lcp create GigabitEthernet10/0/0 host-if e0
+lcp create GigabitEthernet10/0/1 host-if e1
+lcp create GigabitEthernet10/0/2 host-if e2
+lcp create GigabitEthernet10/0/3 host-if e3

overlays/bird/common/etc/vpp/config/loopback.vpp.j2

@@ -0,0 +1,5 @@
+comment { Create a loopback interface }
+create loopback interface instance 0
+set interface state loop0 up
+set interface ip address loop0 {{ node.loopback.ipv4 }}
+set interface ip address loop0 {{ node.loopback.ipv6 }}