various improvements

README.md

@@ -20,13 +20,13 @@ Run `make serve-docs`. See [Development](#development) below.
 - [x] CPU customization (emulation mode, model, vendor, features)
 - [ ] BIOS/UEFI settings
 - [x] Device attaching
-- [ ] Device detaching
+- [x] Device detaching
 - [ ] GPU passthrough
 - [ ] CPU guarantied resource percent support
 - [x] QEMU Guest Agent management
 - [ ] Instance resources usage stats
 - [ ] SSH-keys management
-- [x] Setting user passwords in guest [not tested]
+- [x] Setting user passwords in guest
 - [x] QCOW2 disks support
 - [ ] ZVOL support
 - [ ] Network disks support

compute/cli/control.py

@@ -234,13 +234,20 @@ def main(session: Session, args: argparse.Namespace) -> None:
         case 'setmem':
             instance = session.get_instance(args.instance)
             instance.set_memory(args.memory, live=True)
+        case 'setpasswd':
+            instance = session.get_instance(args.instance)
+            instance.set_user_password(
+                args.username,
+                args.password,
+                encrypted=args.encrypted,
+            )
 
 
 def cli() -> None:  # noqa: PLR0915
-    """Parse command line arguments."""
+    """Return command line arguments parser."""
     root = argparse.ArgumentParser(
         prog='compute',
-        description='manage compute instances and storage volumes.',
+        description='manage compute instances',
         formatter_class=argparse.RawTextHelpFormatter,
     )
     root.add_argument(
@@ -383,13 +390,27 @@ def cli() -> None:  # noqa: PLR0915
     setmem.add_argument('instance')
     setmem.add_argument('memory', type=int, help='memory in MiB')
 
-    # Run parser
+    # setpasswd subcommand
+    setpasswd = subparsers.add_parser(
+        'setpasswd',
+        help='set user password in guest',
+    )
+    setpasswd.add_argument('instance')
+    setpasswd.add_argument('username')
+    setpasswd.add_argument('password')
+    setpasswd.add_argument(
+        '-e',
+        '--encrypted',
+        action='store_true',
+        default=False,
+        help='set it if password is already encrypted',
+    )
+
     args = root.parse_args()
     if args.command is None:
         root.print_help()
         sys.exit()
 
-    # Set logging level
     log_level = args.log_level or os.getenv('CMP_LOG')
 
     if isinstance(log_level, str) and log_level.lower() in log_levels:
@@ -398,7 +419,6 @@ def cli() -> None:  # noqa: PLR0915
         )
 
     log.debug('CLI started with args: %s', args)
-    # Perform actions
     try:
         with Session(args.connect) as session:
             main(session, args)

compute/exceptions.py

@@ -37,6 +37,22 @@ class StoragePoolError(ComputeServiceError):
     """Something went wrong when operating with storage pool."""
 
 
+class StoragePoolNotFoundError(StoragePoolError):
+    """Storage pool not found."""
+
+    def __init__(self, msg: str):
+        """Initialise StoragePoolNotFoundError."""
+        super().__init__(f"storage pool named '{msg}' not found")
+
+
+class VolumeNotFoundError(StoragePoolError):
+    """Storage volume not found."""
+
+    def __init__(self, msg: str):
+        """Initialise VolumeNotFoundError."""
+        super().__init__(f"storage volume '{msg}' not found")
+
+
 class InstanceError(ComputeServiceError):
     """Something went wrong while interacting with the domain."""
 

compute/instance/guest_agent.py

@@ -78,8 +78,8 @@ class GuestAgent:
         except GuestAgentError:
             return False
 
-    def available_commands(self) -> set[str]:
+    def get_supported_commands(self) -> set[str]:
-        """Return set of available guest agent commands."""
+        """Return set of supported guest agent commands."""
         output = self.execute({'execute': 'guest-info', 'arguments': {}})
         return {
             cmd['name']
@@ -94,8 +94,9 @@ class GuestAgent:
         :param commands: List of required commands
         :raise: GuestAgentCommandNotSupportedError
         """
+        supported = self.get_supported_commands()
         for command in commands:
-            if command not in self.available_commands():
+            if command not in supported:
                 raise GuestAgentCommandNotSupportedError(command)
 
     def guest_exec(  # noqa: PLR0913

compute/instance/instance.py

@@ -13,6 +13,7 @@ from compute.exceptions import (
     GuestAgentCommandNotSupportedError,
     InstanceError,
 )
+from compute.storage import DiskConfig
 from compute.utils import units
 
 from .guest_agent import GuestAgent
@@ -181,7 +182,7 @@ class InstanceInfo(NamedTuple):
 
 
 class DeviceConfig:
-    """Abstract device description class."""
+    """Abstract device config class."""
 
 
 class Instance:
@@ -485,6 +486,11 @@ class Instance:
             msg = f'Cannot set memory for instance={self.name} {memory=}: {e}'
             raise InstanceError(msg) from e
 
+    def _get_disk_by_target(self, target: str) -> etree.Element:
+        xml = etree.fromstring(self.dump_xml())  # noqa: S320
+        child = xml.xpath(f'/domain/devices/disk/target[@dev="{target}"]')
+        return child[0].getparent() if child else None
+
     def attach_device(
         self, device: 'DeviceConfig', *, live: bool = False
     ) -> None:
@@ -501,6 +507,13 @@ class Instance:
             )
         else:
             flags = libvirt.VIR_DOMAIN_AFFECT_CONFIG
+        if isinstance(device, DiskConfig):  # noqa: SIM102
+            if self._get_disk_by_target(device.target):
+                log.warning(
+                    "Volume with target '%s' is already attached",
+                    device.target,
+                )
+                return
         self.domain.attachDeviceFlags(device.to_xml(), flags=flags)
 
     def detach_device(
@@ -519,8 +532,48 @@ class Instance:
             )
         else:
             flags = libvirt.VIR_DOMAIN_AFFECT_CONFIG
+        if isinstance(device, DiskConfig):  # noqa: SIM102
+            if self._get_disk_by_target(device.target) is None:
+                log.warning(
+                    "Volume with target '%s' is already detached",
+                    device.target,
+                )
+                return
         self.domain.detachDeviceFlags(device.to_xml(), flags=flags)
 
+    def detach_disk(self, name: str) -> None:
+        """
+        Detach disk device by target name.
+
+        There is no ``attach_disk()`` method. Use :method:`attach_device`
+        with :class:`DiskConfig` as parameter.
+
+        :param name: Disk name e.g. 'vda', 'sda', etc. This name may
+            not match the name of the disk inside the guest OS.
+        """
+        xml = self._get_disk_by_target(name)
+        if xml is None:
+            log.warning(
+                "Volume with target '%s' is already detached",
+                name,
+            )
+            return
+        disk_params = {
+            'disk_type': xml.get('type'),
+            'source': xml.find('source').get('file'),
+            'target': xml.find('target').get('dev'),
+            'readonly': False if xml.find('readonly') is None else True,  # noqa: SIM211
+        }
+        for param in disk_params:
+            if disk_params[param] is None:
+                msg = (
+                    f"Cannot detach volume with target '{name}': "
+                    f"parameter '{param}' is not defined in libvirt XML "
+                    'config on host.'
+                )
+                raise InstanceError(msg)
+        self.detach_device(DiskConfig(**disk_params), live=True)
+
     def resize_volume(
         self, name: str, capacity: int, unit: units.DataUnit
     ) -> None:
@@ -573,7 +626,9 @@ class Instance:
         """
         raise NotImplementedError
 
-    def set_user_password(self, user: str, password: str) -> None:
+    def set_user_password(
+        self, user: str, password: str, *, encrypted: bool = False
+    ) -> None:
         """
         Set new user password in guest OS.
 
@@ -581,8 +636,16 @@ class Instance:
 
         :param user: Username.
         :param password: Password.
+        :param encrypted: Set it to True if password is already encrypted.
+            Right encryption method depends on guest OS.
         """
-        self.domain.setUserPassword(user, password)
+        if not self.guest_agent.is_available():
+            raise InstanceError(
+                'Cannot change password: guest agent is unavailable'
+            )
+        self.guest_agent.raise_for_commands(['guest-set-user-password'])
+        flags = libvirt.VIR_DOMAIN_PASSWORD_ENCRYPTED if encrypted else 0
+        self.domain.setUserPassword(user, password, flags=flags)
 
     def dump_xml(self, *, inactive: bool = False) -> str:
         """Return instance XML description."""

compute/session.py

@@ -10,7 +10,11 @@ from uuid import uuid4
 import libvirt
 from lxml import etree
 
-from .exceptions import InstanceNotFoundError, SessionError
+from .exceptions import (
+    InstanceNotFoundError,
+    SessionError,
+    StoragePoolNotFoundError,
+)
 from .instance import Instance, InstanceConfig, InstanceSchema
 from .storage import DiskConfig, StoragePool, VolumeConfig
 from .utils import units
@@ -23,10 +27,14 @@ class Capabilities(NamedTuple):
     """Store domain capabilities info."""
 
     arch: str
-    virt: str
+    virt_type: str
     emulator: str
     machine: str
     max_vcpus: int
+    cpu_vendor: str
+    cpu_model: str
+    cpu_features: dict
+    usable_cpus: list[dict]
 
 
 class NodeInfo(NamedTuple):
@@ -101,16 +109,47 @@ class Session(AbstractContextManager):
             threads=info[7],
         )
 
+    def _cap_get_usable_cpus(self, xml: etree.Element) -> list[dict]:
+        x = xml.xpath('/domainCapabilities/cpu/mode[@name="custom"]')[0]
+        cpus = []
+        for cpu in x.findall('model'):
+            if cpu.get('usable') == 'yes':
+                cpus.append(  # noqa: PERF401
+                    {
+                        'vendor': cpu.get('vendor'),
+                        'model': cpu.text,
+                    }
+                )
+        return cpus
+
+    def _cap_get_cpu_features(self, xml: etree.Element) -> dict:
+        x = xml.xpath('/domainCapabilities/cpu/mode[@name="host-model"]')[0]
+        require = []
+        disable = []
+        for feature in x.findall('feature'):
+            policy = feature.get('policy')
+            name = feature.get('name')
+            if policy == 'require':
+                require.append(name)
+            if policy == 'disable':
+                disable.append(name)
+        return {'require': require, 'disable': disable}
+
     def get_capabilities(self) -> Capabilities:
         """Return capabilities e.g. arch, virt, emulator, etc."""
         prefix = '/domainCapabilities'
+        hprefix = f'{prefix}/cpu/mode[@name="host-model"]'
         caps = etree.fromstring(self.connection.getDomainCapabilities())  # noqa: S320
         return Capabilities(
             arch=caps.xpath(f'{prefix}/arch/text()')[0],
-            virt=caps.xpath(f'{prefix}/domain/text()')[0],
+            virt_type=caps.xpath(f'{prefix}/domain/text()')[0],
             emulator=caps.xpath(f'{prefix}/path/text()')[0],
             machine=caps.xpath(f'{prefix}/machine/text()')[0],
             max_vcpus=int(caps.xpath(f'{prefix}/vcpu/@max')[0]),
+            cpu_vendor=caps.xpath(f'{hprefix}/vendor/text()')[0],
+            cpu_model=caps.xpath(f'{hprefix}/model/text()')[0],
+            cpu_features=self._cap_get_cpu_features(caps),
+            usable_cpus=self._cap_get_cpus(caps),
         )
 
     def create_instance(self, **kwargs: Any) -> Instance:
@@ -169,7 +208,7 @@ class Session(AbstractContextManager):
             volumes_pool = self.get_storage_pool(self.VOLUMES_POOL)
             log.info('Building volume configuration...')
             if not volume.source:
-                vol_name = f'{config.name}-{volume.target}-{uuid4()}.qcow2'
+                vol_name = f'{uuid4()}.qcow2'
             else:
                 vol_name = volume.source
             vol_conf = VolumeConfig(
@@ -196,7 +235,12 @@ class Session(AbstractContextManager):
                 volumes_pool.create_volume(vol_conf)
             log.info('Attaching volume to instance...')
             instance.attach_device(
-                DiskConfig(path=vol_conf.path, target=volume.target)
+                DiskConfig(
+                    disk_type=volume.type,
+                    source=vol_conf.path,
+                    target=volume.target,
+                    readonly=volume.is_readonly,
+                )
             )
         return instance
 
@@ -204,10 +248,10 @@ class Session(AbstractContextManager):
         """Get compute instance by name."""
         try:
             return Instance(self.connection.lookupByName(name))
-        except libvirt.libvirtError as err:
+        except libvirt.libvirtError as e:
-            if err.get_error_code() == libvirt.VIR_ERR_NO_DOMAIN:
+            if e.get_error_code() == libvirt.VIR_ERR_NO_DOMAIN:
-                raise InstanceNotFoundError(name) from err
+                raise InstanceNotFoundError(name) from e
-            raise SessionError(err) from err
+            raise SessionError(e) from e
 
     def list_instances(self) -> list[Instance]:
         """List all instances."""
@@ -215,8 +259,12 @@ class Session(AbstractContextManager):
 
     def get_storage_pool(self, name: str) -> StoragePool:
         """Get storage pool by name."""
-        # TODO @ge: handle Storage pool not found error
+        try:
-        return StoragePool(self.connection.storagePoolLookupByName(name))
+            return StoragePool(self.connection.storagePoolLookupByName(name))
+        except libvirt.libvirtError as e:
+            if e.get_error_code() == libvirt.VIR_ERR_NO_STORAGE_POOL:
+                raise StoragePoolNotFoundError(name) from e
+            raise SessionError(e) from e
 
     def list_storage_pools(self) -> list[StoragePool]:
         """List all strage pools."""

compute/storage/pool.py

@@ -7,7 +7,7 @@ from typing import NamedTuple
 import libvirt
 from lxml import etree
 
-from compute.exceptions import StoragePoolError
+from compute.exceptions import StoragePoolError, VolumeNotFoundError
 
 from .volume import Volume, VolumeConfig
 
@@ -99,13 +99,8 @@ class StoragePool:
             vol = self.pool.storageVolLookupByName(name)
             return Volume(self.pool, vol)
         except libvirt.libvirtError as e:
-            # TODO @ge: Raise VolumeNotFoundError instead
+            if e.get_error_code() == libvirt.VIR_ERR_NO_STORAGE_VOL:
-            if (
+                raise VolumeNotFoundError(name) from e
-                e.get_error_domain() == libvirt.VIR_FROM_STORAGE
-                or e.get_error_code() == libvirt.VIR_ERR_NO_STORAGE_VOL
-            ):
-                log.exception(e.get_error_message())
-                return None
             log.exception('unexpected error from libvirt')
             raise StoragePoolError(e) from e
 

compute/storage/volume.py

@@ -56,15 +56,17 @@ class DiskConfig:
     to compute instances.
     """
 
+    disk_type: str
+    source: str | Path
     target: str
-    path: str
     readonly: bool = False
 
     def to_xml(self) -> str:
         """Return XML config for libvirt."""
-        xml = E.disk(type='file', device='disk')
+        xml = E.disk(type=self.disk_type, device='disk')
         xml.append(E.driver(name='qemu', type='qcow2', cache='writethrough'))
-        xml.append(E.source(file=self.path))
+        if self.disk_type == 'file':
+            xml.append(E.source(file=str(self.source)))
         xml.append(E.target(dev=self.target, bus='virtio'))
         if self.readonly:
             xml.append(E.readonly())

docs/source/index.rst

@@ -1,12 +1,12 @@
 Compute
 =======
 
-Compute-instance management library.
+Compute instances management library.
 
 .. toctree::
     :maxdepth: 1
 
-    python-api/index
+    pyapi/index
 
 Indices and tables
 ------------------

dom.xml

@@ -0,0 +1,227 @@
+<domain type='kvm' id='1'>
+  <name>debian12</name>
+  <uuid>721cf06b-879a-4f4e-875b-b3d0382328ef</uuid>
+  <metadata>
+    <libosinfo:libosinfo xmlns:libosinfo="http://libosinfo.org/xmlns/libvirt/domain/1.0">
+      <libosinfo:os id="http://debian.org/debian/12"/>
+    </libosinfo:libosinfo>
+  </metadata>
+  <memory unit='KiB'>4194304</memory>
+  <currentMemory unit='KiB'>4194304</currentMemory>
+  <vcpu placement='static'>4</vcpu>
+  <resource>
+    <partition>/machine</partition>
+  </resource>
+  <os>
+    <type arch='x86_64' machine='pc-q35-8.0'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <features>
+    <acpi/>
+    <apic/>
+    <vmport state='off'/>
+  </features>
+  <cpu mode='host-passthrough' check='none' migratable='on'/>
+  <clock offset='utc'>
+    <timer name='rtc' tickpolicy='catchup'/>
+    <timer name='pit' tickpolicy='delay'/>
+    <timer name='hpet' present='no'/>
+  </clock>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <pm>
+    <suspend-to-mem enabled='no'/>
+    <suspend-to-disk enabled='no'/>
+  </pm>
+  <devices>
+    <emulator>/usr/bin/qemu-system-x86_64</emulator>
+    <disk type='file' device='disk'>
+      <driver name='qemu' type='qcow2' discard='unmap'/>
+      <source file='/var/lib/libvirt/images/debian12.qcow2' index='1'/>
+      <backingStore/>
+      <target dev='vda' bus='virtio'/>
+      <alias name='virtio-disk0'/>
+      <address type='pci' domain='0x0000' bus='0x04' slot='0x00' function='0x0'/>
+    </disk>
+    <controller type='usb' index='0' model='qemu-xhci' ports='15'>
+      <alias name='usb'/>
+      <address type='pci' domain='0x0000' bus='0x02' slot='0x00' function='0x0'/>
+    </controller>
+    <controller type='pci' index='0' model='pcie-root'>
+      <alias name='pcie.0'/>
+    </controller>
+    <controller type='pci' index='1' model='pcie-root-port'>
+      <model name='pcie-root-port'/>
+      <target chassis='1' port='0x10'/>
+      <alias name='pci.1'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0' multifunction='on'/>
+    </controller>
+    <controller type='pci' index='2' model='pcie-root-port'>
+      <model name='pcie-root-port'/>
+      <target chassis='2' port='0x11'/>
+      <alias name='pci.2'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x1'/>
+    </controller>
+    <controller type='pci' index='3' model='pcie-root-port'>
+      <model name='pcie-root-port'/>
+      <target chassis='3' port='0x12'/>
+      <alias name='pci.3'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x2'/>
+    </controller>
+    <controller type='pci' index='4' model='pcie-root-port'>
+      <model name='pcie-root-port'/>
+      <target chassis='4' port='0x13'/>
+      <alias name='pci.4'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x3'/>
+    </controller>
+    <controller type='pci' index='5' model='pcie-root-port'>
+      <model name='pcie-root-port'/>
+      <target chassis='5' port='0x14'/>
+      <alias name='pci.5'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x4'/>
+    </controller>
+    <controller type='pci' index='6' model='pcie-root-port'>
+      <model name='pcie-root-port'/>
+      <target chassis='6' port='0x15'/>
+      <alias name='pci.6'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x5'/>
+    </controller>
+    <controller type='pci' index='7' model='pcie-root-port'>
+      <model name='pcie-root-port'/>
+      <target chassis='7' port='0x16'/>
+      <alias name='pci.7'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x6'/>
+    </controller>
+    <controller type='pci' index='8' model='pcie-root-port'>
+      <model name='pcie-root-port'/>
+      <target chassis='8' port='0x17'/>
+      <alias name='pci.8'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x7'/>
+    </controller>
+    <controller type='pci' index='9' model='pcie-root-port'>
+      <model name='pcie-root-port'/>
+      <target chassis='9' port='0x18'/>
+      <alias name='pci.9'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0' multifunction='on'/>
+    </controller>
+    <controller type='pci' index='10' model='pcie-root-port'>
+      <model name='pcie-root-port'/>
+      <target chassis='10' port='0x19'/>
+      <alias name='pci.10'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x1'/>
+    </controller>
+    <controller type='pci' index='11' model='pcie-root-port'>
+      <model name='pcie-root-port'/>
+      <target chassis='11' port='0x1a'/>
+      <alias name='pci.11'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x2'/>
+    </controller>
+    <controller type='pci' index='12' model='pcie-root-port'>
+      <model name='pcie-root-port'/>
+      <target chassis='12' port='0x1b'/>
+      <alias name='pci.12'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x3'/>
+    </controller>
+    <controller type='pci' index='13' model='pcie-root-port'>
+      <model name='pcie-root-port'/>
+      <target chassis='13' port='0x1c'/>
+      <alias name='pci.13'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x4'/>
+    </controller>
+    <controller type='pci' index='14' model='pcie-root-port'>
+      <model name='pcie-root-port'/>
+      <target chassis='14' port='0x1d'/>
+      <alias name='pci.14'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x5'/>
+    </controller>
+    <controller type='sata' index='0'>
+      <alias name='ide'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x1f' function='0x2'/>
+    </controller>
+    <controller type='virtio-serial' index='0'>
+      <alias name='virtio-serial0'/>
+      <address type='pci' domain='0x0000' bus='0x03' slot='0x00' function='0x0'/>
+    </controller>
+    <interface type='network'>
+      <mac address='52:54:00:9b:d7:98'/>
+      <source network='default' portid='98463b3d-9ab1-4d7f-9bf4-4ce3df078509' bridge='virbr0'/>
+      <target dev='vnet0'/>
+      <model type='virtio'/>
+      <alias name='net0'/>
+      <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
+    </interface>
+    <serial type='pty'>
+      <source path='/dev/pts/2'/>
+      <target type='isa-serial' port='0'>
+        <model name='isa-serial'/>
+      </target>
+      <alias name='serial0'/>
+    </serial>
+    <console type='pty' tty='/dev/pts/2'>
+      <source path='/dev/pts/2'/>
+      <target type='serial' port='0'/>
+      <alias name='serial0'/>
+    </console>
+    <channel type='unix'>
+      <source mode='bind' path='/run/libvirt/qemu/channel/1-debian12/org.qemu.guest_agent.0'/>
+      <target type='virtio' name='org.qemu.guest_agent.0' state='connected'/>
+      <alias name='channel0'/>
+      <address type='virtio-serial' controller='0' bus='0' port='1'/>
+    </channel>
+    <channel type='spicevmc'>
+      <target type='virtio' name='com.redhat.spice.0' state='disconnected'/>
+      <alias name='channel1'/>
+      <address type='virtio-serial' controller='0' bus='0' port='2'/>
+    </channel>
+    <input type='tablet' bus='usb'>
+      <alias name='input0'/>
+      <address type='usb' bus='0' port='1'/>
+    </input>
+    <input type='mouse' bus='ps2'>
+      <alias name='input1'/>
+    </input>
+    <input type='keyboard' bus='ps2'>
+      <alias name='input2'/>
+    </input>
+    <graphics type='spice' port='5900' autoport='yes' listen='127.0.0.1'>
+      <listen type='address' address='127.0.0.1'/>
+      <image compression='off'/>
+    </graphics>
+    <sound model='ich9'>
+      <alias name='sound0'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x1b' function='0x0'/>
+    </sound>
+    <audio id='1' type='spice'/>
+    <video>
+      <model type='virtio' heads='1' primary='yes'/>
+      <alias name='video0'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/>
+    </video>
+    <redirdev bus='usb' type='spicevmc'>
+      <alias name='redir0'/>
+      <address type='usb' bus='0' port='2'/>
+    </redirdev>
+    <redirdev bus='usb' type='spicevmc'>
+      <alias name='redir1'/>
+      <address type='usb' bus='0' port='3'/>
+    </redirdev>
+    <watchdog model='itco' action='reset'>
+      <alias name='watchdog0'/>
+    </watchdog>
+    <memballoon model='virtio'>
+      <alias name='balloon0'/>
+      <address type='pci' domain='0x0000' bus='0x05' slot='0x00' function='0x0'/>
+    </memballoon>
+    <rng model='virtio'>
+      <backend model='random'>/dev/urandom</backend>
+      <alias name='rng0'/>
+      <address type='pci' domain='0x0000' bus='0x06' slot='0x00' function='0x0'/>
+    </rng>
+  </devices>
+  <seclabel type='dynamic' model='dac' relabel='yes'>
+    <label>+961:+961</label>
+    <imagelabel>+961:+961</imagelabel>
+  </seclabel>
+</domain>
+

packaging/completion.bash

@@ -0,0 +1,14 @@
+_cmp_get_domains()
+{
+    for file in /etc/libvirt/qemu/*.xml; do
+        nodir="${file##*/}"
+        printf '%s\n' "${nodir//\.xml}"
+    done
+}
+
+_compute()
+{
+    :
+}
+
+complete -o filenames -F _compute compute

xmltool.py

@@ -0,0 +1,30 @@
+from pathlib import Path
+
+from lxml import etree
+
+from compute.storage import DiskConfig
+
+
+
+with Path('./dom.xml').open('r') as f:
+    xml = etree.fromstring(f.read())
+
+
+
+def get_disk_by_target(name):
+    disk_tgt = xml.xpath('/domain/devices/disk/target[@dev="vda"]')
+
+
+
+def get_disks(xml: etree.Element) -> list[etree.Element]:
+    xmldisks = xml.findall('devices/disk')
+    for xmldisk in xmldisks:
+        disk_config = DiskConfig(
+            type=xmldisk.get('type'),
+            device=xmldisk.get('device'),
+            target=xmldisk.find('target').get('dev'),
+            path=xmldisk.find('source').get('file'),
+        )
+
+
+