networkd: Emulate old kernel naming

The old kernel names are handed out by netname.sh which is called by
79-netname.rules. rename-network-interfaces.service does the rename by
stopping networkd, taking down the interfaces, re-adding the interfaces,
and then restarting networkd.

sdk_container/src/third_party/coreos-overlay/coreos-base/oem-rackspace-teeth/files/cloud-config.yml

@@ -1,5 +1,19 @@
 #cloud-config
 
+write_files:
+  - path: /run/udev/rules.d/79-netname.rules
+    permissions: 444
+    content: |
+      SUBSYSTEM!="net", GOTO="netname_end"
+      ACTION!="add", GOTO="netname_end"
+      ENV{ID_BUS}!="pci", GOTO="netname_end"
+
+      IMPORT{program}="/usr/share/oem/bin/netname.sh $env{IFINDEX}"
+
+      NAME=="", ENV{ID_NET_NAME_SIMPLE}!="", NAME="$env{ID_NET_NAME_SIMPLE}"
+
+      LABEL="netname_end"
+
 coreos:
     units:
       - name: user-configdrive.service.d/netconf.conf
@@ -22,6 +36,20 @@ coreos:
 
           [Install]
           WantedBy=user-config.target
+      - name: rename-network-interfaces.service
+        command: start
+        runtime: yes
+        content: |
+          [Unit]
+          Before=user-config.target
+
+          [Service]
+          Type=oneshot
+          RemainAfterExit=yes
+          ExecStart=/usr/bin/systemctl stop systemd-networkd
+          ExecStart=/usr/bin/bash -c "for dev in $(ip link show | gawk -F ':' '/^[0-9]+/ { print $2 }' | tr -d ' ' | sed 's/lo//'); do ip link set $dev down; done"
+          ExecStart=/usr/bin/bash -c "udevadm test /sys/class/net/*"
+          ExecStart=/usr/bin/systemctl start systemd-networkd
       - name: media-configdrive.mount
         command: start
         runtime: yes

sdk_container/src/third_party/coreos-overlay/coreos-base/oem-rackspace-teeth/files/netname.sh

@@ -0,0 +1,4 @@
+#! /bin/bash
+
+IFINDEX=$1
+echo "ID_NET_NAME_SIMPLE=eth$((${IFINDEX} - 2))"

sdk_container/src/third_party/coreos-overlay/coreos-base/oem-rackspace-teeth/oem-rackspace-teeth-0.0.1.ebuild

@@ -15,6 +15,9 @@ KEYWORDS="amd64 x86"
 S="${WORKDIR}"
 
 src_install() {
+	into "/usr/share/oem"
+	dobin ${FILESDIR}/netname.sh
+
 	insinto "/usr/share/oem"
 	doins ${FILESDIR}/cloud-config.yml
 }