# # Common code for all guests # # Copyright 2006-2009, 2013 Red Hat, Inc. # Jeremy Katz # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, # MA 02110-1301 USA. import os import logging from .devicedisk import VirtualDisk from .osxml import OSXML class Installer(object): """ Installer classes attempt to encapsulate all the parameters needed to 'install' a guest: essentially, booting the guest with the correct media for the OS install phase (if there is one), and setting up the guest to boot to the correct media for all subsequent runs. Some of the actual functionality: - Determining what type of install media has been requested, and representing it correctly to the Guest - Fetching install kernel/initrd or boot.iso from a URL - Setting the boot device as appropriate depending on whether we are booting into an OS install, or booting post-install Some of the information that the Installer needs to know to accomplish this: - Install media location (could be a URL, local path, ...) - Virtualization type (parameter 'os_type') ('xen', 'hvm', etc.) - Hypervisor name (parameter 'type') ('qemu', 'kvm', 'xen', etc.) - Guest architecture ('i686', 'x86_64') """ _has_install_phase = True def __init__(self, conn): self.conn = conn self._location = None self.cdrom = False self.livecd = False self.extraargs = [] self.initrd_injections = [] self._install_kernel = None self._install_initrd = None self._tmpfiles = [] self._tmpvols = [] ######################### # Properties properties # ######################### def get_location(self): return self._location def set_location(self, val): self._location = self._validate_location(val) location = property(get_location, set_location) ################### # Private helpers # ################### def _build_boot_order(self, isinstall, guest): bootorder = [self._get_bootdev(isinstall, guest)] # 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.get_devices("disk"): if disk.device == disk.DEVICE_DISK: bootdev = "hd" if bootdev not in bootorder: bootorder.append(bootdev) break return bootorder def alter_bootconfig(self, guest, isinstall): """ Generate the portion of the guest xml that determines boot devices and parameters. (typically the block) @param guest: Guest instance we are installing @type guest: L{Guest} @param isinstall: Whether we want xml for the 'install' phase or the 'post-install' phase. @type isinstall: C{bool} """ if isinstall and not self.has_install_phase(): return bootorder = self._build_boot_order(isinstall, guest) if not guest.os.bootorder: # Per device is not compatible with os/boot. if not any(d.boot.order for d in guest.get_all_devices()): guest.os.bootorder = bootorder if not isinstall: return if self._install_kernel: guest.os.kernel = self._install_kernel if self._install_initrd: guest.os.initrd = self._install_initrd if self.extraargs: guest.os.kernel_args = " ".join(self.extraargs) ########################## # Internal API overrides # ########################## def _get_bootdev(self, isinstall, guest): raise NotImplementedError("Must be implemented in subclass") def _validate_location(self, val): return val def _prepare(self, guest, meter): ignore = guest ignore = meter ############## # Public API # ############## def scratchdir_required(self): """ Returns true if scratchdir is needed for the passed install parameters. Apps can use this to determine if they should attempt to ensure scratchdir permissions are adequate """ return False 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. """ return self._has_install_phase def needs_cdrom(self): """ If this installer uses cdrom media, so it needs a cdrom device attached to the VM """ return False def cdrom_path(self): """ Return the cdrom path needed for needs_cdrom() installs """ return None def cleanup(self): """ Remove any temporary files retrieved during installation """ for f in self._tmpfiles: logging.debug("Removing " + f) os.unlink(f) for vol in self._tmpvols: logging.debug("Removing volume '%s'", vol.name()) vol.delete(0) self._tmpvols = [] self._tmpfiles = [] def prepare(self, guest, meter): self.cleanup() try: self._prepare(guest, meter) except: self.cleanup() raise def check_location(self, guest): """ Validate self.location seems to work. This will might hit the network so we don't want to do it on demand. """ ignore = guest return True 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 """ ignore = guest logging.debug("distro detection not available for this installer.") return None class ContainerInstaller(Installer): _has_install_phase = False def _get_bootdev(self, isinstall, guest): ignore = isinstall ignore = guest return OSXML.BOOT_DEVICE_HARDDISK class PXEInstaller(Installer): def _get_bootdev(self, isinstall, guest): bootdev = OSXML.BOOT_DEVICE_NETWORK if (not isinstall and [d for d in guest.get_devices("disk") if d.device == d.DEVICE_DISK]): # If doing post-install boot and guest has an HD attached bootdev = OSXML.BOOT_DEVICE_HARDDISK return bootdev class ImportInstaller(Installer): _has_install_phase = False # Private methods def _get_bootdev(self, isinstall, guest): disks = guest.get_devices("disk") if not disks: return OSXML.BOOT_DEVICE_HARDDISK return self._disk_to_bootdev(disks[0]) def _disk_to_bootdev(self, disk): if disk.device == VirtualDisk.DEVICE_DISK: return OSXML.BOOT_DEVICE_HARDDISK elif disk.device == VirtualDisk.DEVICE_CDROM: return OSXML.BOOT_DEVICE_CDROM elif disk.device == VirtualDisk.DEVICE_FLOPPY: return OSXML.BOOT_DEVICE_FLOPPY else: return OSXML.BOOT_DEVICE_HARDDISK