virt-manager/virtinst/installer.py
2019-06-07 16:49:19 -04:00

541 lines
19 KiB
Python

#
# Common code for all guests
#
# Copyright 2006-2009, 2013 Red Hat, Inc.
#
# This work is licensed under the GNU GPLv2 or later.
# See the COPYING file in the top-level directory.
import os
import logging
from .devices import DeviceDisk
from .domain import DomainOs
from .osdict import OSDB, OsMedia
from .installertreemedia import InstallerTreeMedia
from .cdrominject import perform_cdrom_injections
from . import unattended
from . import util
class Installer(object):
"""
Class for kicking off VM installs. The VM is set up separately in a Guest
instance. This class tracks the install media/bootdev choice, alters the
Guest XML, boots it for the install, then saves the post install XML
config. The Guest is passed in via start_install, only install media
selection is done at __init__ time
:param cdrom: Path to a cdrom device or iso. Maps to virt-install --cdrom
:param location: An install tree URI, local directory, or ISO/CDROM path.
Largely handled by installtreemedia helper class. Maps to virt-install
--location
:param install_bootdev: The VM bootdev to use (HD, NETWORK, CDROM, FLOPPY)
:param location_kernel: URL pointing to a kernel to fetch, or a relative
path to indicate where the kernel is stored in location
:param location_initrd: location_kernel, but pointing to an initrd
"""
def __init__(self, conn, cdrom=None, location=None, install_bootdev=None,
location_kernel=None, location_initrd=None):
self.conn = conn
self.livecd = False
self.extra_args = []
# Entry point for virt-manager 'Customize' wizard to change autostart
self.autostart = False
self._install_bootdev = install_bootdev
self._install_kernel = None
self._install_initrd = None
self._install_cdrom_device_added = False
self._unattended_install_cdrom_device = None
self._unattended_files = []
self._defaults_are_set = False
self._unattended_data = None
if location_kernel or location_initrd:
if not location:
raise ValueError(_("location kernel/initrd may only "
"be specified with a location URL/path"))
if not (location_kernel and location_initrd):
raise ValueError(_("location kernel/initrd must be "
"be specified as a pair"))
self._cdrom = None
self._treemedia = None
if cdrom:
cdrom = InstallerTreeMedia.validate_path(self.conn, cdrom)
self._cdrom = cdrom
self._install_bootdev = "cdrom"
if location:
self._treemedia = InstallerTreeMedia(self.conn, location,
location_kernel, location_initrd)
###################
# Private helpers #
###################
def _cdrom_path(self):
if self._treemedia:
return self._treemedia.cdrom_path()
return self._cdrom
def _add_install_cdrom_device(self, guest):
if self._install_cdrom_device_added:
return
if not bool(self._cdrom_path()):
return
dev = DeviceDisk(self.conn)
dev.device = dev.DEVICE_CDROM
dev.path = self._cdrom_path()
dev.sync_path_props()
dev.validate()
self._install_cdrom_device_added = True
# Insert the CDROM before any other CDROM, so boot=cdrom picks
# it as the priority
for idx, disk in enumerate(guest.devices.disk):
if disk.is_cdrom():
guest.devices.add_child(dev, idx=idx)
return
guest.add_device(dev)
def _remove_install_cdrom_media(self, guest):
if not self._install_cdrom_device_added:
return
if self.livecd:
return
if guest.osinfo.is_windows():
# Keep media attached for windows which has a multi stage install
return
for disk in guest.devices.disk:
if disk.is_cdrom() and disk.path == self._cdrom_path():
disk.path = None
disk.sync_path_props()
break
def _add_unattended_install_cdrom_device(self, guest, location):
if self._unattended_install_cdrom_device:
return
dev = DeviceDisk(self.conn)
dev.device = dev.DEVICE_CDROM
dev.path = location
dev.sync_path_props()
dev.validate()
dev.set_defaults(guest)
self._unattended_install_cdrom_device = dev
guest.add_device(self._unattended_install_cdrom_device)
def _remove_unattended_install_cdrom_device(self, guest):
dummy = guest
if not self._unattended_install_cdrom_device:
return
self._unattended_install_cdrom_device.path = None
self._unattended_install_cdrom_device.sync_path_props()
def _cleanup_unattended_files(self):
dirs = []
for f in self._unattended_files:
dirname = os.path.dirname(f)
if dirname not in dirs:
dirs.append(dirname)
logging.debug("Removing %s", str(f))
os.unlink(f)
for d in dirs:
if not os.listdir(d):
logging.debug("Removing %s", str(d))
os.rmdir(d)
def _build_boot_order(self, guest, bootdev):
bootorder = [bootdev]
# If guest has an attached disk, always have 'hd' in the boot
# list, so disks are marked as bootable/installable (needed for
# windows virtio installs, and booting local disk from PXE)
for disk in guest.devices.disk:
if disk.device == disk.DEVICE_DISK:
bootdev = "hd"
if bootdev not in bootorder:
bootorder.append(bootdev)
break
return bootorder
def _can_set_guest_bootorder(self, guest):
return (not guest.os.is_container() and
not guest.os.kernel and
not any([d.boot.order for d in guest.devices.get_all()]))
def _alter_bootconfig(self, guest):
"""
Generate the portion of the guest xml that determines boot devices
and parameters. (typically the <os></os> block)
:param guest: Guest instance we are installing
"""
guest.on_reboot = "destroy"
if self._install_kernel:
guest.os.kernel = self._install_kernel
if self._install_initrd:
guest.os.initrd = self._install_initrd
if self.extra_args:
guest.os.kernel_args = " ".join(self.extra_args)
bootdev = self._install_bootdev
if bootdev and self._can_set_guest_bootorder(guest):
guest.os.bootorder = self._build_boot_order(guest, bootdev)
else:
guest.os.bootorder = []
def _alter_install_resources(self, guest, meter):
"""
Sets the appropriate amount of ram needed when performing a "network"
based installation
:param guest: Guest instance we are installing
"""
if not self._treemedia:
return
if not self._treemedia.requires_internet(guest, meter):
return
res = guest.osinfo.get_network_install_resources(guest)
if (res and res.get("ram") > 0 and
res["ram"] // 1024 > guest.currentMemory):
logging.debug("Setting ram from libosinfo network-install "
"resources: '%d'", res["ram"] // 1024)
guest.currentMemory = res["ram"] // 1024
##########################
# Internal API overrides #
##########################
def _prepare(self, guest, meter):
if self._treemedia:
k, i, a = self._treemedia.prepare(guest, meter)
self._install_kernel = k
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())
iso = perform_cdrom_injections([path], util.get_cache_dir())
self._add_unattended_install_cdrom_device(guest, iso)
self._unattended_files.extend([path, iso])
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:
return DomainOs.BOOT_DEVICE_CDROM
if self._install_bootdev:
if any([d for d in guest.devices.disk
if d.device == d.DEVICE_DISK]):
return DomainOs.BOOT_DEVICE_HARDDISK
return self._install_bootdev
device = guest.devices.disk and guest.devices.disk[0].device or None
if device == DeviceDisk.DEVICE_DISK:
return DomainOs.BOOT_DEVICE_HARDDISK
elif device == DeviceDisk.DEVICE_CDROM:
return DomainOs.BOOT_DEVICE_CDROM
elif device == DeviceDisk.DEVICE_FLOPPY:
return DomainOs.BOOT_DEVICE_FLOPPY
return DomainOs.BOOT_DEVICE_HARDDISK
##############
# Public API #
##############
@property
def location(self):
if self._treemedia:
return self._treemedia.location
@property
def cdrom(self):
return self._cdrom
def set_initrd_injections(self, initrd_injections):
if self._treemedia:
self._treemedia.initrd_injections = initrd_injections
def set_install_defaults(self, guest):
"""
Allow API users to set defaults ahead of time if they want it.
Used by vmmDomainVirtinst so the 'Customize before install' dialog
shows accurate values.
If the user doesn't explicitly call this, it will be called by
start_install()
"""
if self._defaults_are_set:
return
self._add_install_cdrom_device(guest)
if not guest.os.bootorder and self._can_set_guest_bootorder(guest):
bootdev = self._get_postinstall_bootdev(guest)
guest.os.bootorder = self._build_boot_order(guest, bootdev)
guest.set_defaults(None)
self._defaults_are_set = True
def get_search_paths(self, guest):
"""
Return a list of paths that the hypervisor will need search access
for to perform this install.
"""
search_paths = []
if self._treemedia:
search_paths.append(InstallerTreeMedia.make_scratchdir(guest))
if self._cdrom_path():
search_paths.append(self._cdrom_path())
return search_paths
def has_install_phase(self):
"""
Return True if the requested setup is actually installing an OS
into the guest. Things like LiveCDs, Import, or a manually specified
bootorder do not have an install phase.
"""
if self.cdrom and self.livecd:
return False
return bool(self._cdrom or
self._install_bootdev or
self._treemedia)
def detect_distro(self, guest):
"""
Attempt to detect the distro for the Installer's 'location'. If
an error is encountered in the detection process (or if detection
is not relevant for the Installer type), None is returned.
:returns: distro variant string, or None
"""
ret = None
if self._treemedia:
ret = self._treemedia.detect_distro(guest)
elif self.cdrom:
if guest.conn.is_remote():
logging.debug("Can't detect distro for cdrom "
"remote connection.")
else:
osguess = OSDB.guess_os_by_iso(self.cdrom)
if osguess:
ret = osguess[0]
else:
logging.debug("No media for distro detection.")
logging.debug("installer.detect_distro returned=%s", ret)
return ret
def set_unattended_data(self, unattended_data):
if self._treemedia:
self._treemedia.set_unattended_data(unattended_data)
else:
self._unattended_data = unattended_data
##########################
# guest install handling #
##########################
def _prepare_get_install_xml(self, guest):
# We do a shallow copy of the OS block here, so that we can
# set the install time properties but not permanently overwrite
# any config the user explicitly requested.
data = (guest.os.bootorder, guest.os.kernel, guest.os.initrd,
guest.os.kernel_args, guest.on_reboot, guest.currentMemory,
guest.memory)
return data
def _finish_get_install_xml(self, guest, data):
(guest.os.bootorder, guest.os.kernel, guest.os.initrd,
guest.os.kernel_args, guest.on_reboot, guest.currentMemory,
guest.memory) = data
def _get_install_xml(self, guest, meter):
data = self._prepare_get_install_xml(guest)
try:
self._alter_bootconfig(guest)
self._alter_install_resources(guest, meter)
ret = guest.get_xml()
return ret
finally:
self._remove_install_cdrom_media(guest)
self._remove_unattended_install_cdrom_device(guest)
self._finish_get_install_xml(guest, data)
def _build_xml(self, guest, meter):
install_xml = None
if self.has_install_phase():
install_xml = self._get_install_xml(guest, meter)
final_xml = guest.get_xml()
logging.debug("Generated install XML: %s",
(install_xml and ("\n" + install_xml) or "None required"))
logging.debug("Generated boot XML: \n%s", final_xml)
return install_xml, final_xml
def _manual_transient_create(self, install_xml, final_xml, needs_boot):
"""
For hypervisors (like vz) that don't implement createXML,
we need to define+start, and undefine on start failure
"""
domain = self.conn.defineXML(install_xml or final_xml)
if not needs_boot:
return domain
# Handle undefining the VM if the initial startup fails
try:
domain.create()
except Exception:
try:
domain.undefine()
except Exception:
pass
raise
if install_xml and install_xml != final_xml:
domain = self.conn.defineXML(final_xml)
return domain
def _create_guest(self, guest,
meter, install_xml, final_xml, doboot, transient):
"""
Actually do the XML logging, guest defining/creating
:param doboot: Boot guest even if it has no install phase
"""
meter_label = _("Creating domain...")
meter = util.ensure_meter(meter)
meter.start(size=None, text=meter_label)
needs_boot = doboot or self.has_install_phase()
if guest.type == "vz":
if transient:
raise RuntimeError(_("Domain type 'vz' doesn't support "
"transient installs."))
domain = self._manual_transient_create(
install_xml, final_xml, needs_boot)
else:
if transient or needs_boot:
domain = self.conn.createXML(install_xml or final_xml, 0)
if not transient:
domain = self.conn.defineXML(final_xml)
try:
logging.debug("XML fetched from libvirt object:\n%s",
domain.XMLDesc(0))
except Exception as e:
logging.debug("Error fetching XML from libvirt object: %s", e)
return domain
def _flag_autostart(self, domain):
"""
Set the autostart flag for domain if the user requested it
"""
try:
domain.setAutostart(True)
except Exception as e:
if not self.conn.support.is_error_nosupport(e):
raise
logging.warning("Could not set autostart flag: libvirt "
"connection does not support autostart.")
######################
# Public install API #
######################
def start_install(self, guest, meter=None,
dry=False, return_xml=False,
doboot=True, transient=False):
"""
Begin the guest install. Will add install media to the guest config,
launch it, then redefine the XML with the postinstall config.
:param return_xml: Don't create the guest, just return generated XML
"""
guest.validate_name(guest.conn, guest.name)
self.set_install_defaults(guest)
try:
self._prepare(guest, meter)
if not dry:
for dev in guest.devices.disk:
dev.build_storage(meter)
install_xml, final_xml = self._build_xml(guest, meter)
if return_xml:
return (install_xml, final_xml)
if dry:
return
domain = self._create_guest(
guest, meter, install_xml, final_xml,
doboot, transient)
if self.autostart:
self._flag_autostart(domain)
return domain
finally:
self._cleanup(guest)
def get_created_disks(self, guest):
return [d for d in guest.devices.disk if d.storage_was_created]
def cleanup_created_disks(self, guest, meter):
"""
Remove any disks we created as part of the install. Only ever
called by clients.
"""
clean_disks = self.get_created_disks(guest)
if not clean_disks:
return
for disk in clean_disks:
logging.debug("Removing created disk path=%s vol_object=%s",
disk.path, disk.get_vol_object())
name = os.path.basename(disk.path)
try:
meter.start(size=None, text=_("Removing disk '%s'") % name)
if disk.get_vol_object():
disk.get_vol_object().delete()
else:
os.unlink(disk.path)
meter.end(0)
except Exception as e:
logging.debug("Failed to remove disk '%s'",
name, exc_info=True)
logging.error("Failed to remove disk '%s': %s", name, e)