tests: Add a test for correct disk device ordering

tests/qemuxml2argvdata/qemuxml2argv-disk-order.args

+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test /usr/bin/qemu \
+-S \
+-M pc \
+-m 214 \
+-smp 1 \
+-nographic \
+-nodefaults \
+-monitor unix:/tmp/test-monitor,server,nowait \
+-no-acpi \
+-boot c \
+-drive file=/dev/HostVG/QEMUGuest1,if=none,id=drive-ide0-0-0 \
+-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 \
+-drive file=/dev/HostVG/QEMUGuest2,if=none,media=cdrom,id=drive-ide0-1-0 \
+-device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 \
+-drive file=/tmp/data.img,if=none,id=drive-virtio-disk0 \
+-device virtio-blk-pci,bus=pci.0,addr=0x3,drive=drive-virtio-disk0,id=virtio-disk0 \
+-drive file=/tmp/logs.img,if=none,id=drive-virtio-disk1 \
+-device virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk1,id=virtio-disk1 \
+-usb \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5

tests/qemuxml2argvdata/qemuxml2argv-disk-order.xml

+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory>219136</memory>
+  <currentMemory>219136</currentMemory>
+  <vcpu>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <disk type='block' device='cdrom'>
+      <source dev='/dev/HostVG/QEMUGuest2'/>
+      <target dev='hdc' bus='ide'/>
+      <readonly/>
+    </disk>
+    <disk type='file' device='disk'>
+      <source file='/tmp/logs.img'/>
+      <target dev='vdb' bus='virtio'/>
+    </disk>
+    <disk type='block' device='disk'>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+    </disk>
+    <disk type='file' device='disk'>
+      <source file='/tmp/data.img'/>
+      <target dev='vda' bus='virtio'/>
+    </disk>
+    <controller type='ide' index='0'/>
+    <memballoon model='virtio'/>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -283,6 +283,8 @@ mymain(void)
     DO_TEST("disk-floppy", false, NONE);
     DO_TEST("disk-many", false, NONE);
     DO_TEST("disk-virtio", false, QEMU_CAPS_DRIVE, QEMU_CAPS_DRIVE_BOOT);
+    DO_TEST("disk-order", false,
+            QEMU_CAPS_DRIVE, QEMU_CAPS_DEVICE, QEMU_CAPS_DRIVE_BOOT);
     DO_TEST("disk-xenvbd", false, QEMU_CAPS_DRIVE, QEMU_CAPS_DRIVE_BOOT);
     DO_TEST("disk-drive-boot-disk", false,
             QEMU_CAPS_DRIVE, QEMU_CAPS_DRIVE_BOOT);