installer: add support for windows unattended install

The Windows unattended installation is quite similar to the Linux one
with a few major differences:
- It uses floppy injection instead of initrd injection
  - Yes, it does. Then we have to create a floppy, add the device and,
    when finishing the installation, remove the device;
- There's no InstallerTreeMedia in the game making us end up duplicating
  some code in the Installer class as:
  - keeping track of files that have to be cleanup up;
  - actually cleaning up the files;
  - generating the install script

Apart from that, some obvious differences in the scripts where already
done in a previous commit, but those were basically:
- Not using /dev/*da as a target disk, but use "C" instead;
- Set the product-key
- Explicitly set the injection method as "floppy"

Signed-off-by: Fabiano Fidêncio <fidencio@redhat.com>

virt-install

@@ -449,10 +449,11 @@ def build_installer(options, guest):
     if options.unattended:
         if options.os_variant.is_none or options.os_variant.is_auto:
             fail(_("--unattended requires an explicit --os-variant"))
-        if options.cdrom:
-            options.location = options.cdrom
-            options.cdrom = None
-        options.os_variant.install = "location"
+        if not guest.osinfo.is_windows():
+            if options.cdrom:
+                options.location = options.cdrom
+                options.cdrom = None
+            options.os_variant.install = "location"
 
     if options.os_variant.install == "location":
         if not options.location:

virtinst/installer.py

@@ -13,8 +13,10 @@ import libvirt
 
 from .devices import DeviceDisk
 from .domain import DomainOs
-from .osdict import OSDB
+from .osdict import OSDB, OsMedia
 from .installertreemedia import InstallerTreeMedia
+from .floppyinject import perform_floppy_injections
+from . import unattended
 from . import util
 
 
@@ -208,10 +210,26 @@ class Installer(object):
             self._install_initrd = i
             if a and "VIRTINST_INITRD_TEST" not in os.environ:
                 self.extra_args.append(a)
+        elif self._unattended_data:
+            osguess = OSDB.guess_os_by_iso(self.cdrom)
+            osmedia = OsMedia(osguess[1])
+            script = unattended.prepare_install_script(
+                    guest, self._unattended_data, self.cdrom, osmedia)
+            path, _ = unattended.generate_install_script(script)
+            logging.debug("Generated unattended script: %s", path)
+            logging.debug("Generated script contents:\n%s",
+                    open(path).read())
+
+            floppy = perform_floppy_injections([path], util.get_cache_dir())
+            self._add_install_floppy_device(guest, floppy)
+
+            self._unattended_files.extend([path, floppy])
 
     def _cleanup(self, guest):
         if self._treemedia:
             self._treemedia.cleanup(guest)
+        elif self._unattended_files:
+            self._cleanup_unattended_files()
 
     def _get_postinstall_bootdev(self, guest):
         if self.cdrom and self.livecd:
@@ -354,6 +372,7 @@ class Installer(object):
             return ret
         finally:
             self._remove_install_cdrom_media(guest)
+            self._remove_install_floppy_device(guest)
             self._finish_get_install_xml(guest, data)
 
     def _build_xml(self, guest, meter):