Introduces basic support for spawning, rebooting and destroying vms when using Microsoft Hyper-V as the hypervisor.

Images need to be in VHD format. Note that although Hyper-V doesn't accept kernel and ramdisk
separate from the image, the nova objectstore api still expects an image to have an associated aki and ari. You can use dummy aki and ari images -- the hyper-v driver won't use them or try to download them.
Requires Python's WMI module.

4 files changed, 570 insertions, 8 deletions

diff --git a/nova/tests/hyperv_unittest.py b/nova/tests/hyperv_unittest.py
new file mode 100644
index 000000000..3980ae3cb
--- /dev/null
+++ b/nova/tests/hyperv_unittest.py
@@ -0,0 +1,71 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+#
+#    Copyright 2010 Cloud.com, Inc
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+"""
+Tests For Hyper-V driver
+"""
+
+import random
+
+from nova import context
+from nova import db
+from nova import flags
+from nova import test
+from nova.auth import manager
+from nova.virt import hyperv
+
+FLAGS = flags.FLAGS
+FLAGS.connection_type = 'hyperv'
+
+
+class HyperVTestCase(test.TestCase):
+    """Test cases for the Hyper-V driver"""
+    def setUp(self):
+        super(HyperVTestCase, self).setUp()
+        self.manager = manager.AuthManager()
+        self.user = self.manager.create_user('fake', 'fake', 'fake',
+                                             admin=True)
+        self.project = self.manager.create_project('fake', 'fake', 'fake')
+        self.context = context.RequestContext(self.user, self.project)
+
+    def test_create_destroy(self):
+        """Create a VM and destroy it"""
+        instance = {'internal_id': random.randint(1, 1000000),
+                     'memory_mb': '1024',
+                     'mac_address': '02:12:34:46:56:67',
+                     'vcpus': 2,
+                     'project_id': 'fake',
+                     'instance_type': 'm1.small'}
+        instance_ref = db.instance_create(self.context, instance)
+
+        conn = hyperv.get_connection(False)
+        conn._create_vm(instance_ref)  # pylint: disable-msg=W0212
+        found = [n  for n in conn.list_instances()
+                      if n == instance_ref['name']]
+        self.assertTrue(len(found) == 1)
+        info = conn.get_info(instance_ref['name'])
+        #Unfortunately since the vm is not running at this point,
+        #we cannot obtain memory information from get_info
+        self.assertEquals(info['num_cpu'], instance_ref['vcpus'])
+
+        conn.destroy(instance_ref)
+        found = [n  for n in conn.list_instances()
+                      if n == instance_ref['name']]
+        self.assertTrue(len(found) == 0)
+
+    def tearDown(self):
+        super(HyperVTestCase, self).tearDown()
+        self.manager.delete_project(self.project)
+        self.manager.delete_user(self.user)
diff --git a/nova/virt/connection.py b/nova/virt/connection.py
index 61e99944e..846423afe 100644
--- a/nova/virt/connection.py
+++ b/nova/virt/connection.py
@@ -26,6 +26,7 @@ from nova import flags
 from nova.virt import fake
 from nova.virt import libvirt_conn
 from nova.virt import xenapi_conn
+from nova.virt import hyperv
 
 
 FLAGS = flags.FLAGS
@@ -62,6 +63,8 @@ def get_connection(read_only=False):
         conn = libvirt_conn.get_connection(read_only)
     elif t == 'xenapi':
         conn = xenapi_conn.get_connection(read_only)
+    elif t == 'hyperv':
+        conn = hyperv.get_connection(read_only)
     else:
         raise Exception('Unknown connection type "%s"' % t)
 
diff --git a/nova/virt/hyperv.py b/nova/virt/hyperv.py
new file mode 100644
index 000000000..4b9f6f946
--- /dev/null
+++ b/nova/virt/hyperv.py
@@ -0,0 +1,459 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright (c) 2010 Cloud.com, Inc
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+"""
+A connection to Hyper-V .
+Uses Windows Management Instrumentation (WMI) calls to interact with Hyper-V
+Hyper-V WMI usage:
+    http://msdn.microsoft.com/en-us/library/cc723875%28v=VS.85%29.aspx
+The Hyper-V object model briefly:
+    The physical computer and its hosted virtual machines are each represented
+    by the Msvm_ComputerSystem class.
+
+    Each virtual machine is associated with a
+    Msvm_VirtualSystemGlobalSettingData (vs_gs_data) instance and one or more
+    Msvm_VirtualSystemSettingData (vmsetting) instances. For each vmsetting
+    there is a series of Msvm_ResourceAllocationSettingData (rasd) objects.
+    The rasd objects describe the settings for each device in a VM.
+    Together, the vs_gs_data, vmsettings and rasds describe the configuration
+    of the virtual machine.
+
+    Creating new resources such as disks and nics involves cloning a default
+    rasd object and appropriately modifying the clone and calling the
+    AddVirtualSystemResources WMI method
+    Changing resources such as memory uses the ModifyVirtualSystemResources
+    WMI method
+
+Using the Python WMI library:
+    Tutorial:
+        http://timgolden.me.uk/python/wmi/tutorial.html
+    Hyper-V WMI objects can be retrieved simply by using the class name
+    of the WMI object and optionally specifying a column to filter the
+    result set. More complex filters can be formed using WQL (sql-like)
+    queries.
+    The parameters and return tuples of WMI method calls can gleaned by
+    examining the doc string. For example:
+    >>> vs_man_svc.ModifyVirtualSystemResources.__doc__
+    ModifyVirtualSystemResources (ComputerSystem, ResourceSettingData[])
+                 => (Job, ReturnValue)'
+    When passing setting data (ResourceSettingData) to the WMI method,
+    an XML representation of the data is passed in using GetText_(1).
+    Available methods on a service can be determined using method.keys():
+    >>> vs_man_svc.methods.keys()
+    vmsettings and rasds for a vm can be retrieved using the 'associators'
+    method with the appropriate return class.
+    Long running WMI commands generally return a Job (an instance of
+    Msvm_ConcreteJob) whose state can be polled to determine when it finishes
+
+"""
+
+import os
+import logging
+import time
+
+from nova import exception
+from nova import flags
+from nova.auth import manager
+from nova.compute import power_state
+from nova.virt import images
+
+wmi = None
+
+
+FLAGS = flags.FLAGS
+
+
+HYPERV_POWER_STATE = {
+    3: power_state.SHUTDOWN,
+    2: power_state.RUNNING,
+    32768: power_state.PAUSED,
+}
+
+
+REQ_POWER_STATE = {
+    'Enabled': 2,
+    'Disabled': 3,
+    'Reboot': 10,
+    'Reset': 11,
+    'Paused': 32768,
+    'Suspended': 32769
+}
+
+
+WMI_JOB_STATUS_STARTED = 4096
+WMI_JOB_STATE_RUNNING = 4
+WMI_JOB_STATE_COMPLETED = 7
+
+
+def get_connection(_):
+    global wmi
+    if wmi is None:
+        wmi = __import__('wmi')
+    return HyperVConnection()
+
+
+class HyperVConnection(object):
+    def __init__(self):
+        self._conn = wmi.WMI(moniker='//./root/virtualization')
+        self._cim_conn = wmi.WMI(moniker='//./root/cimv2')
+
+    def init_host(self):
+        #FIXME(chiradeep): implement this
+        logging.debug(_('In init host'))
+        pass
+
+    def list_instances(self):
+        """ Return the names of all the instances known to Hyper-V. """
+        vms = [v.ElementName \
+                for v in self._conn.Msvm_ComputerSystem(['ElementName'])]
+        return vms
+
+    def spawn(self, instance):
+        """ Create a new VM and start it."""
+        vm = self._lookup(instance.name)
+        if vm is not None:
+            raise exception.Duplicate(_('Attempt to create duplicate vm %s') %
+                            instance.name)
+
+        user = manager.AuthManager().get_user(instance['user_id'])
+        project = manager.AuthManager().get_project(instance['project_id'])
+        #Fetch the file, assume it is a VHD file.
+        base_vhd_filename = os.path.join(FLAGS.instances_path,
+                                         instance.name)
+        vhdfile = "%s.vhd" % (base_vhd_filename)
+        images.fetch(instance['image_id'], vhdfile, user, project)
+
+        try:
+            self._create_vm(instance)
+
+            self._create_disk(instance['name'], vhdfile)
+            self._create_nic(instance['name'], instance['mac_address'])
+
+            logging.debug(_('Starting VM %s '), instance.name)
+            self._set_vm_state(instance['name'], 'Enabled')
+            logging.info(_('Started VM %s '), instance.name)
+        except Exception as exn:
+            logging.error(_('spawn vm failed: %s'), exn)
+            self.destroy(instance)
+
+    def _create_vm(self, instance):
+        """Create a VM but don't start it.  """
+        vs_man_svc = self._conn.Msvm_VirtualSystemManagementService()[0]
+
+        vs_gs_data = self._conn.Msvm_VirtualSystemGlobalSettingData.new()
+        vs_gs_data.ElementName = instance['name']
+        (job, ret_val) = vs_man_svc.DefineVirtualSystem(
+                                        [], None, vs_gs_data.GetText_(1))[1:]
+        if ret_val == WMI_JOB_STATUS_STARTED:
+            success = self._check_job_status(job)
+        else:
+            success = (ret_val == 0)
+
+        if not success:
+            raise Exception(_('Failed to create VM %s'), instance.name)
+
+        logging.debug(_('Created VM %s...'), instance.name)
+        vm = self._conn.Msvm_ComputerSystem(ElementName=instance.name)[0]
+
+        vmsettings = vm.associators(
+                          wmi_result_class='Msvm_VirtualSystemSettingData')
+        vmsetting = [s for s in vmsettings
+                        if s.SettingType == 3][0]  # avoid snapshots
+        memsetting = vmsetting.associators(
+                           wmi_result_class='Msvm_MemorySettingData')[0]
+        #No Dynamic Memory, so reservation, limit and quantity are identical.
+        mem = long(str(instance['memory_mb']))
+        memsetting.VirtualQuantity = mem
+        memsetting.Reservation = mem
+        memsetting.Limit = mem
+
+        (job, ret_val) = vs_man_svc.ModifyVirtualSystemResources(
+                                        vm.path_(), [memsetting.GetText_(1)])
+        logging.debug(_('Set memory for vm %s...'), instance.name)
+        procsetting = vmsetting.associators(
+                          wmi_result_class='Msvm_ProcessorSettingData')[0]
+        vcpus = long(instance['vcpus'])
+        procsetting.VirtualQuantity = vcpus
+        procsetting.Reservation = vcpus
+        procsetting.Limit = vcpus
+
+        (job, ret_val) = vs_man_svc.ModifyVirtualSystemResources(
+                                        vm.path_(), [procsetting.GetText_(1)])
+        logging.debug(_('Set vcpus for vm %s...'), instance.name)
+
+    def _create_disk(self, vm_name, vhdfile):
+        """Create a disk and attach it to the vm"""
+        logging.debug(_('Creating disk for %s by attaching disk file %s'),
+                        vm_name, vhdfile)
+        #Find the IDE controller for the vm.
+        vms = self._conn.MSVM_ComputerSystem(ElementName=vm_name)
+        vm = vms[0]
+        vmsettings = vm.associators(
+                        wmi_result_class='Msvm_VirtualSystemSettingData')
+        rasds = vmsettings[0].associators(
+                        wmi_result_class='MSVM_ResourceAllocationSettingData')
+        ctrller = [r for r in rasds
+                   if r.ResourceSubType == 'Microsoft Emulated IDE Controller'\
+                                         and r.Address == "0"]
+        #Find the default disk drive object for the vm and clone it.
+        diskdflt = self._conn.query(
+                  "SELECT * FROM Msvm_ResourceAllocationSettingData \
+                   WHERE ResourceSubType LIKE 'Microsoft Synthetic Disk Drive'\
+                   AND InstanceID LIKE '%Default%'")[0]
+        diskdrive = self._clone_wmi_obj(
+                    'Msvm_ResourceAllocationSettingData', diskdflt)
+        #Set the IDE ctrller as parent.
+        diskdrive.Parent = ctrller[0].path_()
+        diskdrive.Address = 0
+        #Add the cloned disk drive object to the vm.
+        new_resources = self._add_virt_resource(diskdrive, vm)
+        if new_resources is None:
+            raise Exception(_('Failed to add diskdrive to VM %s'),
+                                             vm_name)
+        diskdrive_path = new_resources[0]
+        logging.debug(_('New disk drive path is %s'), diskdrive_path)
+        #Find the default VHD disk object.
+        vhddefault = self._conn.query(
+                "SELECT * FROM Msvm_ResourceAllocationSettingData \
+                 WHERE ResourceSubType LIKE 'Microsoft Virtual Hard Disk' AND \
+                 InstanceID LIKE '%Default%' ")[0]
+
+        #Clone the default and point it to the image file.
+        vhddisk = self._clone_wmi_obj(
+                'Msvm_ResourceAllocationSettingData', vhddefault)
+        #Set the new drive as the parent.
+        vhddisk.Parent = diskdrive_path
+        vhddisk.Connection = [vhdfile]
+
+        #Add the new vhd object as a virtual hard disk to the vm.
+        new_resources = self._add_virt_resource(vhddisk, vm)
+        if new_resources is None:
+            raise Exception(_('Failed to add vhd file to VM %s'),
+                                             vm_name)
+        logging.info(_('Created disk for %s'), vm_name)
+
+    def _create_nic(self, vm_name, mac):
+        """Create a (emulated) nic and attach it to the vm"""
+        logging.debug(_('Creating nic for %s '), vm_name)
+        #Find the vswitch that is connected to the physical nic.
+        vms = self._conn.Msvm_ComputerSystem(ElementName=vm_name)
+        extswitch = self._find_external_network()
+        vm = vms[0]
+        switch_svc = self._conn.Msvm_VirtualSwitchManagementService()[0]
+        #Find the default nic and clone it to create a new nic for the vm.
+        #Use Msvm_SyntheticEthernetPortSettingData for Windows or Linux with
+        #Linux Integration Components installed.
+        emulatednics_data = self._conn.Msvm_EmulatedEthernetPortSettingData()
+        default_nic_data = [n for n in emulatednics_data
+                            if n.InstanceID.rfind('Default') > 0]
+        new_nic_data = self._clone_wmi_obj(
+                                      'Msvm_EmulatedEthernetPortSettingData',
+                                      default_nic_data[0])
+        #Create a port on the vswitch.
+        (new_port, ret_val) = switch_svc.CreateSwitchPort(vm_name, vm_name,
+                                            "", extswitch.path_())
+        if ret_val != 0:
+            logging.error(_('Failed creating a port on the external vswitch'))
+            raise Exception(_('Failed creating port for %s'),
+                                             vm_name)
+        logging.debug(_("Created switch port %s on switch %s"),
+                        vm_name, extswitch.path_())
+        #Connect the new nic to the new port.
+        new_nic_data.Connection = [new_port]
+        new_nic_data.ElementName = vm_name + ' nic'
+        new_nic_data.Address = ''.join(mac.split(':'))
+        new_nic_data.StaticMacAddress = 'TRUE'
+        #Add the new nic to the vm.
+        new_resources = self._add_virt_resource(new_nic_data, vm)
+        if new_resources is None:
+            raise Exception(_('Failed to add nic to VM %s'),
+                                             vm_name)
+        logging.info(_("Created nic for %s "), vm_name)
+
+    def _add_virt_resource(self, res_setting_data, target_vm):
+        """Add a new resource (disk/nic) to the VM"""
+        vs_man_svc = self._conn.Msvm_VirtualSystemManagementService()[0]
+        (job, new_resources, ret_val) = vs_man_svc.\
+                    AddVirtualSystemResources([res_setting_data.GetText_(1)],
+                                                target_vm.path_())
+        success = True
+        if ret_val == WMI_JOB_STATUS_STARTED:
+            success = self._check_job_status(job)
+        else:
+            success = (ret_val == 0)
+        if success:
+            return new_resources
+        else:
+            return None
+
+    #TODO: use the reactor to poll instead of sleep
+    def _check_job_status(self, jobpath):
+        """Poll WMI job state for completion"""
+        #Jobs have a path of the form:
+        #\\WIN-P5IG7367DAG\root\virtualization:Msvm_ConcreteJob.InstanceID=
+        #"8A496B9C-AF4D-4E98-BD3C-1128CD85320D"
+        inst_id = jobpath.split('=')[1].strip('"')
+        jobs = self._conn.Msvm_ConcreteJob(InstanceID=inst_id)
+        if len(jobs) == 0:
+            return False
+        job = jobs[0]
+        while job.JobState == WMI_JOB_STATE_RUNNING:
+            time.sleep(0.1)
+            job = self._conn.Msvm_ConcreteJob(InstanceID=inst_id)[0]
+        if job.JobState != WMI_JOB_STATE_COMPLETED:
+            logging.debug(_("WMI job failed: %s"), job.ErrorSummaryDescription)
+            return False
+        logging.debug(_("WMI job succeeded: %s, Elapsed=%s "), job.Description,
+                      job.ElapsedTime)
+        return True
+
+    def _find_external_network(self):
+        """Find the vswitch that is connected to the physical nic.
+           Assumes only one physical nic on the host
+        """
+        #If there are no physical nics connected to networks, return.
+        bound = self._conn.Msvm_ExternalEthernetPort(IsBound='TRUE')
+        if len(bound) == 0:
+            return None
+        return self._conn.Msvm_ExternalEthernetPort(IsBound='TRUE')[0]\
+            .associators(wmi_result_class='Msvm_SwitchLANEndpoint')[0]\
+            .associators(wmi_result_class='Msvm_SwitchPort')[0]\
+            .associators(wmi_result_class='Msvm_VirtualSwitch')[0]
+
+    def _clone_wmi_obj(self, wmi_class, wmi_obj):
+        """Clone a WMI object"""
+        cl = self._conn.__getattr__(wmi_class)  # get the class
+        newinst = cl.new()
+        #Copy the properties from the original.
+        for prop in wmi_obj._properties:
+            newinst.Properties_.Item(prop).Value =\
+                    wmi_obj.Properties_.Item(prop).Value
+        return newinst
+
+    def reboot(self, instance):
+        """Reboot the specified instance."""
+        vm = self._lookup(instance.name)
+        if vm is None:
+            raise exception.NotFound('instance not present %s' % instance.name)
+        self._set_vm_state(instance.name, 'Reboot')
+
+    def destroy(self, instance):
+        """Destroy the VM. Also destroy the associated VHD disk files"""
+        logging.debug(_("Got request to destroy vm %s"), instance.name)
+        vm = self._lookup(instance.name)
+        if vm is None:
+            return
+        vm = self._conn.Msvm_ComputerSystem(ElementName=instance.name)[0]
+        vs_man_svc = self._conn.Msvm_VirtualSystemManagementService()[0]
+        #Stop the VM first.
+        self._set_vm_state(instance.name, 'Disabled')
+        vmsettings = vm.associators(
+                         wmi_result_class='Msvm_VirtualSystemSettingData')
+        rasds = vmsettings[0].associators(
+                         wmi_result_class='MSVM_ResourceAllocationSettingData')
+        disks = [r for r in rasds \
+                    if r.ResourceSubType == 'Microsoft Virtual Hard Disk']
+        diskfiles = []
+        #Collect disk file information before destroying the VM.
+        for disk in disks:
+            diskfiles.extend([c for c in disk.Connection])
+        #Nuke the VM. Does not destroy disks.
+        (job, ret_val) = vs_man_svc.DestroyVirtualSystem(vm.path_())
+        if ret_val == WMI_JOB_STATUS_STARTED:
+            success = self._check_job_status(job)
+        elif ret_val == 0:
+            success = True
+        if not success:
+            raise Exception(_('Failed to destroy vm %s') % instance.name)
+        #Delete associated vhd disk files.
+        for disk in diskfiles:
+            vhdfile = self._cim_conn.CIM_DataFile(Name=disk)
+            for vf in vhdfile:
+                vf.Delete()
+                logging.debug(_("Del: disk %s vm %s"), vhdfile, instance.name)
+
+    def get_info(self, instance_id):
+        """Get information about the VM"""
+        vm = self._lookup(instance_id)
+        if vm is None:
+            raise exception.NotFound('instance not present %s' % instance_id)
+        vm = self._conn.Msvm_ComputerSystem(ElementName=instance_id)[0]
+        vs_man_svc = self._conn.Msvm_VirtualSystemManagementService()[0]
+        vmsettings = vm.associators(
+                       wmi_result_class='Msvm_VirtualSystemSettingData')
+        settings_paths = [v.path_() for v in vmsettings]
+        #See http://msdn.microsoft.com/en-us/library/cc160706%28VS.85%29.aspx
+        summary_info = vs_man_svc.GetSummaryInformation(
+                                       [4, 100, 103, 105], settings_paths)[1]
+        info = summary_info[0]
+        logging.debug(_("Got Info for vm %s: state=%s, mem=%s, num_cpu=%s, \
+                    cpu_time=%s"), instance_id,
+                    str(HYPERV_POWER_STATE[info.EnabledState]),
+                    str(info.MemoryUsage),
+                    str(info.NumberOfProcessors),
+                    str(info.UpTime))
+
+        return {'state': HYPERV_POWER_STATE[info.EnabledState],
+                'max_mem': info.MemoryUsage,
+                'mem': info.MemoryUsage,
+                'num_cpu': info.NumberOfProcessors,
+                'cpu_time': info.UpTime}
+
+    def _lookup(self, i):
+        vms = self._conn.Msvm_ComputerSystem(ElementName=i)
+        n = len(vms)
+        if n == 0:
+            return None
+        elif n > 1:
+            raise Exception(_('duplicate name found: %s') % i)
+        else:
+            return vms[0].ElementName
+
+    def _set_vm_state(self, vm_name, req_state):
+        """Set the desired state of the VM"""
+        vms = self._conn.Msvm_ComputerSystem(ElementName=vm_name)
+        if len(vms) == 0:
+            return False
+        (job, ret_val) = vms[0].RequestStateChange(REQ_POWER_STATE[req_state])
+        success = False
+        if ret_val == WMI_JOB_STATUS_STARTED:
+            success = self._check_job_status(job)
+        elif ret_val == 0:
+            success = True
+        elif ret_val == 32775:
+            #Invalid state for current operation. Typically means it is
+            #already in the state requested
+            success = True
+        if success:
+            logging.info(_("Successfully changed vm state of %s to %s"),
+                                vm_name, req_state)
+        else:
+            logging.error(_("Failed to change vm state of %s to %s"),
+                                vm_name, req_state)
+            raise Exception(_("Failed to change vm state of %s to %s"),
+                                        vm_name, req_state)
+
+    def attach_volume(self, instance_name, device_path, mountpoint):
+        vm = self._lookup(instance_name)
+        if vm is None:
+            raise exception.NotFound('Cannot attach volume to missing %s vm' %
+                            instance_name)
+
+    def detach_volume(self, instance_name, mountpoint):
+        vm = self._lookup(instance_name)
+        if vm is None:
+            raise exception.NotFound('Cannot detach volume from missing %s ' %
+                            instance_name)
diff --git a/nova/virt/images.py b/nova/virt/images.py
index 1c9b2e093..2d03da4b4 100644
--- a/nova/virt/images.py
+++ b/nova/virt/images.py
@@ -21,8 +21,12 @@
 Handling of VM disk images.
 """
 
+import logging
 import os.path
+import shutil
+import sys
 import time
+import urllib2
 import urlparse
 
 from nova import flags
@@ -45,6 +49,25 @@ def fetch(image, path, user, project):
     return f(image, path, user, project)
 
 
+def _fetch_image_no_curl(url, path, headers):
+    request = urllib2.Request(url)
+    for (k, v) in headers.iteritems():
+        request.add_header(k, v)
+
+    def urlretrieve(urlfile, fpath):
+        chunk = 1 * 1024 * 1024
+        f = open(fpath, "wb")
+        while 1:
+            data = urlfile.read(chunk)
+            if not data:
+                break
+            f.write(data)
+
+    urlopened = urllib2.urlopen(request)
+    urlretrieve(urlopened, path)
+    logging.debug(_("Finished retreving %s -- placed in %s"), url, path)
+
+
 def _fetch_s3_image(image, path, user, project):
     url = image_url(image)
 
@@ -61,18 +84,24 @@ def _fetch_s3_image(image, path, user, project):
                                                                      url_path)
     headers['Authorization'] = 'AWS %s:%s' % (access, signature)
 
-    cmd = ['/usr/bin/curl', '--fail', '--silent', url]
-    for (k, v) in headers.iteritems():
-        cmd += ['-H', '"%s: %s"' % (k, v)]
+    if sys.platform.startswith('win'):
+        return _fetch_image_no_curl(url, path, headers)
+    else:
+        cmd = ['/usr/bin/curl', '--fail', '--silent', url]
+        for (k, v) in headers.iteritems():
+            cmd += ['-H', '%s: %s' % (k, v)]
 
-    cmd += ['-o', path]
-    cmd_out = ' '.join(cmd)
-    return utils.execute(cmd_out)
+        cmd += ['-o', path]
+        cmd_out = ' '.join(cmd)
+        return utils.execute(cmd_out)
 
 
 def _fetch_local_image(image, path, user, project):
-    source = _image_path('%s/image' % image)
-    return utils.execute('cp %s %s' % (source, path))
+    source = _image_path(os.path.join(image, 'image'))
+    if sys.platform.startswith('win'):
+        return shutil.copy(source, path)
+    else:
+        return utils.execute('cp %s %s' % (source, path))
 
 
 def _image_path(path):