oem-xendom0: experimental OEM for testing Xen under QEMU

For use with the `qemu_xen` vm type. The base image's packages must be
built with the `USE=vm-testing` flag set in order to include Xen.

sdk_container/src/third_party/coreos-overlay/coreos-base/oem-xendom0/files/cloud-config.yml

@@ -0,0 +1,32 @@
+#cloud-config
+
+coreos:
+    units:
+      - name: xenstored.service
+        command: start
+        runtime: yes
+        content: |
+            [Unit]
+            RequiresMountsFor=/proc/xen
+
+            [Service]
+            ExecStartPre=/usr/sbin/modprobe xen-evtchn
+            ExecStart=/usr/sbin/xenstored --no-fork
+            ExecStartPost=/usr/bin/xenstore write /local/domain/0/name Domain-0
+            ExecStartPost=/usr/bin/xenstore write /local/domain/0/domid 0
+      - name: xenconsoled.service
+        command: start
+        runtime: yes
+        content: |
+            [Unit]
+            Requires=xenstored.service
+            After=xenstored.service
+
+            [Service]
+            ExecStart=/usr/sbin/xenconsoled
+    oem:
+        id: xendom0
+        name: Xen Domain0 for Testing
+        version-id: @@OEM_VERSION_ID@@
+        home-url: https://coreos.com
+        bug-report-url: https://github.com/coreos/bugs/issues

sdk_container/src/third_party/coreos-overlay/coreos-base/oem-xendom0/files/grub.cfg

@@ -0,0 +1,15 @@
+# Boot CoreOS as Xen Domain0
+
+set default=coreos-xen
+
+set xen_console="console=vga,com1 com1=115200,8n1"
+set linux_console="console=hvc0 console=tty0"
+serial com0 --speed=115200 --word=8 --parity=no
+terminal_input console serial_com0
+terminal_output console serial_com0
+
+menuentry "CoreOS on Xen" --id=coreos-xen {
+    multiboot /xen-@@XEN_VERSION@@.gz $xen_console noreboot
+    gptprio.next -d root -u usr_uuid
+    module /boot/vmlinuz $linux_console $linux_root usr=PARTUUID=$usr_uuid
+}

sdk_container/src/third_party/coreos-overlay/coreos-base/oem-xendom0/oem-xendom0-4.4.1.ebuild

@@ -0,0 +1,29 @@
+# Copyright (c) 2013 CoreOS, Inc.. All rights reserved.
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=5
+
+DESCRIPTION="OEM suite for Xen testing"
+HOMEPAGE=""
+SRC_URI=""
+
+LICENSE="Apache-2.0"
+SLOT="0"
+KEYWORDS="amd64"
+IUSE=""
+
+# no source directory
+S="${WORKDIR}"
+
+src_prepare() {
+	sed -e "s%@@OEM_VERSION_ID@@%${PVR}%g" \
+	    ${FILESDIR}/cloud-config.yml > ${T}/cloud-config.yml || die
+	sed -e "s%@@XEN_VERSION@@%${PV}%g" \
+	    ${FILESDIR}/grub.cfg > ${T}/grub.cfg || die
+}
+
+src_install() {
+	insinto "/usr/share/oem"
+	doins ${T}/cloud-config.yml
+	doins ${T}/grub.cfg
+}