mirror of
https://github.com/virt-manager/virt-manager.git
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473 lines
16 KiB
Python
473 lines
16 KiB
Python
#
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# Copyright 2006-2009 Red Hat, Inc.
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# Daniel P. Berrange <berrange@redhat.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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# MA 02110-1301 USA.
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import logging
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import os
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import shutil
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import subprocess
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import tempfile
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import urlgrabber
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import Storage
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import support
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import _util
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import Installer
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from VirtualDisk import VirtualDisk
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from User import User
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import OSDistro
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def _is_url(url, is_local):
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"""
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Check if passed string is a (pseudo) valid http, ftp, or nfs url.
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"""
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if is_local and os.path.exists(url):
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if os.path.isdir(url):
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return True
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else:
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return False
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return (url.startswith("http://") or url.startswith("ftp://") or
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url.startswith("nfs:"))
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def _sanitize_url(url):
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"""
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Do nothing for http or ftp, but make sure nfs is in the expected format
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"""
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if url.startswith("nfs://"):
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# Convert RFC compliant NFS nfs://server/path/to/distro
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# to what mount/anaconda expect nfs:server:/path/to/distro
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# and carry the latter form around internally
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url = "nfs:" + url[6:]
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# If we need to add the : after the server
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index = url.find("/", 4)
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if index == -1:
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raise ValueError(_("Invalid NFS format: No path specified."))
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if url[index - 1] != ":":
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url = url[:index] + ":" + url[index:]
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return url
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def _build_pool(conn, meter, path):
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pool = _util.lookup_pool_by_path(conn, path)
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if pool:
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logging.debug("Existing pool '%s' found for %s", pool.name(), path)
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pool.refresh(0)
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return pool
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name = _util.generate_name("boot-scratch",
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conn.storagePoolLookupByName)
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logging.debug("Building storage pool: path=%s name=%s", path, name)
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poolbuild = Storage.DirectoryPool(conn=conn, name=name,
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target_path=path)
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# Explicitly don't build? since if we are creating this directory
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# we probably don't have correct perms
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return poolbuild.install(meter=meter, create=True, build=False,
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autostart=True)
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def _upload_file(conn, meter, destpool, src):
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# Build stream object
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stream = conn.newStream(0)
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def safe_send(data):
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while True:
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ret = stream.send(data)
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if ret == 0 or ret == len(data):
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break
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data = data[ret:]
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if meter is None:
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meter = urlgrabber.progress.BaseMeter()
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# Build placeholder volume
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size = os.path.getsize(src)
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basename = os.path.basename(src)
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poolpath = _util.get_xml_path(destpool.XMLDesc(0), "/pool/target/path")
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name = Storage.StorageVolume.find_free_name(basename,
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pool_object=destpool)
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if name != basename:
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logging.debug("Generated non-colliding volume name %s", name)
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disk = VirtualDisk(conn=conn,
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path=os.path.join(poolpath, name),
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sizebytes=size,
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sparse=True)
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disk.setup_dev(meter=meter)
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vol = disk.vol_object
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if not vol:
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raise RuntimeError(_("Failed to lookup scratch media volume"))
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try:
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# Register upload
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offset = 0
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length = size
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flags = 0
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stream.upload(vol, offset, length, flags)
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# Open source file
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fileobj = file(src, "r")
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# Start transfer
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total = 0
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meter.start(size=size,
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text=_("Transferring %s") % os.path.basename(src))
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while True:
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#blocksize = (1024 ** 2)
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blocksize = 1024
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data = fileobj.read(blocksize)
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if not data:
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break
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safe_send(data)
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total += len(data)
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meter.update(total)
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# Cleanup
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stream.finish()
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meter.end(size)
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except:
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if vol:
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vol.delete(0)
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raise
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return vol
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class DistroInstaller(Installer.Installer):
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def __init__(self, type="xen", location=None, boot=None,
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extraargs=None, os_type=None,
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conn=None, caps=None):
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Installer.Installer.__init__(self, type, location, boot, extraargs,
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os_type, conn=conn, caps=caps)
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self._livecd = False
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# True == location is a filesystem path
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# False == location is a url
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self._location_is_path = True
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# DistroInstaller specific methods/overwrites
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def _get_livecd(self):
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return self._livecd
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def _set_livecd(self, val):
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self._livecd = bool(val)
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livecd = property(_get_livecd, _set_livecd)
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def get_location(self):
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return self._location
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def set_location(self, val):
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"""
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Valid values for location:
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1) it can be a local file (ex. boot.iso), directory (ex. distro
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tree) or physical device (ex. cdrom media)
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2) tuple of the form (poolname, volname) pointing to a file or
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device which will set location as that path
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3) http, ftp, or nfs path for an install tree
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"""
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is_tuple = False
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validated = True
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self._location_is_path = True
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is_local = (not self.conn or not self.is_remote())
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# Basic validation
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if type(val) is not str and (type(val) is not tuple and len(val) != 2):
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raise ValueError(_("Invalid 'location' type %s." % type(val)))
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if type(val) is tuple and len(val) == 2:
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logging.debug("DistroInstaller location is a (poolname, volname)"
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" tuple")
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if not self.conn:
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raise ValueError(_("'conn' must be specified if 'location' is"
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" a storage tuple."))
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is_tuple = True
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elif _is_url(val, is_local):
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val = _sanitize_url(val)
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self._location_is_path = False
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logging.debug("DistroInstaller location is a network source.")
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elif os.path.exists(os.path.abspath(val)) and is_local:
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val = os.path.abspath(val)
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logging.debug("DistroInstaller location is a local "
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"file/path: %s", val)
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else:
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# Didn't determine anything about the location
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validated = False
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if self._location_is_path or (validated == False and self.conn and
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_util.is_storage_capable(self.conn)):
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# If user passed a storage tuple, OR
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# We couldn't determine the location type and a storage capable
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# connection was passed:
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# Pass the parameters off to VirtualDisk to validate, and pull
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# out the path
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stuple = (is_tuple and val) or None
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path = (not is_tuple and val) or None
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try:
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d = VirtualDisk(path=path,
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device=VirtualDisk.DEVICE_CDROM,
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transient=True,
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readOnly=True,
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conn=self.conn,
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volName=stuple)
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val = d.path
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except:
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logging.debug("Error validating install location",
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exc_info=True)
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raise ValueError(_("Checking installer location failed: "
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"Could not find media '%s'." % str(val)))
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elif not validated:
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raise ValueError(_("Install media location must be an NFS, HTTP "
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"or FTP network install source, or an existing "
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"file/device"))
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if (not self._location_is_path and val.startswith("nfs:") and not
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User.current().has_priv(User.PRIV_NFS_MOUNT,
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(self.conn and self.get_uri()))):
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raise ValueError(_('Privilege is required for NFS installations'))
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self._location = val
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location = property(get_location, set_location)
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# Private helper methods
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def _prepare_cdrom(self, guest, meter):
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transient = not self.livecd
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if not self._location_is_path:
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# Xen needs a boot.iso if its a http://, ftp://, or nfs: url
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(store_ignore, os_type_ignore, os_variant_ignore, media) = \
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OSDistro.acquireBootDisk(guest, self.location, meter,
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self.scratchdir)
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cdrom = media
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self._tmpfiles.append(cdrom)
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transient = True
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else:
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cdrom = self.location
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disk = VirtualDisk(path=cdrom,
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conn=guest.conn,
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device=VirtualDisk.DEVICE_CDROM,
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readOnly=True,
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transient=transient)
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self.install_devices.append(disk)
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def _perform_initrd_injections(self, initrd):
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"""
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Insert files into the root directory of the initial ram disk
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"""
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tempdir = tempfile.mkdtemp(dir=self.scratchdir)
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os.chmod(tempdir, 0775)
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for filename in self._initrd_injections:
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logging.debug("Copying %s to the initrd.", filename)
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shutil.copy(filename, tempdir)
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logging.debug("Appending to the initrd.")
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find_proc = subprocess.Popen(['find', '.', '-print0'],
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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cwd=tempdir)
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cpio_proc = subprocess.Popen(['cpio', '-o', '--null', '-Hnewc', '--quiet'],
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stdin=find_proc.stdout,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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cwd=tempdir)
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f = open(initrd, 'ab')
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gzip_proc = subprocess.Popen(['gzip'], stdin=cpio_proc.stdout,
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stdout=f, stderr=subprocess.PIPE)
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cpio_proc.wait()
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find_proc.wait()
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gzip_proc.wait()
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f.close()
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shutil.rmtree(tempdir)
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finderr = find_proc.stderr.read()
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cpioerr = cpio_proc.stderr.read()
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gziperr = gzip_proc.stderr.read()
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if finderr:
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logging.debug("find stderr=%s", finderr)
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if cpioerr:
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logging.debug("cpio stderr=%s", cpioerr)
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if gziperr:
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logging.debug("gzip stderr=%s", gziperr)
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def support_remote_url_install(self):
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if not self.conn:
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return False
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if hasattr(self.conn, "_virtinst__fake_conn"):
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return False
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return support.check_stream_support(self.conn,
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support.SUPPORT_STREAM_UPLOAD)
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def _upload_media(self, guest, meter, kernel, initrd):
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conn = guest.conn
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system_scratchdir = self._get_system_scratchdir()
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if (not guest.is_remote() and
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(self.is_session_uri() or self.scratchdir == system_scratchdir)):
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# We have access to system scratchdir, don't jump through hoops
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logging.debug("Have access to preferred scratchdir so"
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" nothing to upload")
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return kernel, initrd
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if not self.support_remote_url_install():
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logging.debug("Media upload not supported")
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return kernel, initrd
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# Build pool
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logging.debug("Uploading kernel/initrd media")
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pool = _build_pool(conn, meter, system_scratchdir)
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kvol = _upload_file(conn, meter, pool, kernel)
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newkernel = kvol.path()
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self._tmpvols.append(kvol)
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ivol = _upload_file(conn, meter, pool, initrd)
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newinitrd = ivol.path()
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self._tmpvols.append(ivol)
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return newkernel, newinitrd
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def _prepare_kernel_and_initrd(self, guest, meter):
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disk = None
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# If installing off a local path, map it through to a virtual CD/disk
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if (self.location is not None and
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self._location_is_path and
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not os.path.isdir(self.location)):
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device = VirtualDisk.DEVICE_CDROM
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if (self.is_xenpv() and
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not guest._lookup_osdict_key('pv_cdrom_install')):
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device = VirtualDisk.DEVICE_DISK
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disk = VirtualDisk(conn=guest.conn,
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device=device,
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path=self.location,
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readOnly=True,
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transient=True)
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# Make sure we always fetch kernel here if required
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if self._install_bootconfig.kernel and not self.scratchdir_required():
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return disk
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# Need to fetch the kernel & initrd from a remote site, or
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# out of a loopback mounted disk image/device
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ignore, os_type, os_variant, media = OSDistro.acquireKernel(guest,
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self.location, meter,
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self.scratchdir,
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self.os_type)
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(kernelfn, initrdfn, args) = media
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if guest.get_os_autodetect():
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if os_type:
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logging.debug("Auto detected OS type as: %s", os_type)
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guest.os_type = os_type
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if (os_variant and guest.os_type == os_type):
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logging.debug("Auto detected OS variant as: %s", os_variant)
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guest.os_variant = os_variant
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self._tmpfiles.append(kernelfn)
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if initrdfn:
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self._tmpfiles.append(initrdfn)
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if self._initrd_injections:
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self._perform_initrd_injections(initrdfn)
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# If required, upload media to an accessible guest location
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kernelfn, initrdfn = self._upload_media(guest, meter,
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kernelfn, initrdfn)
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self._install_bootconfig.kernel = kernelfn
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self._install_bootconfig.initrd = initrdfn
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self._install_bootconfig.kernel_args = args
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return disk
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def _persistent_cd(self):
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return (self._location_is_path and self.cdrom and self.livecd)
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def _get_bootdev(self, isinstall, guest):
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if isinstall or self._persistent_cd():
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bootdev = self.bootconfig.BOOT_DEVICE_CDROM
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else:
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bootdev = self.bootconfig.BOOT_DEVICE_HARDDISK
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return bootdev
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# General Installer methods
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def scratchdir_required(self):
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if not self.location:
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return False
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is_url = not self._location_is_path
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mount_dvd = self._location_is_path and not self.cdrom
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return bool(is_url or mount_dvd)
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def prepare(self, guest, meter):
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self.cleanup()
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dev = None
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if self.cdrom:
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if self.location:
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dev = self._prepare_cdrom(guest, meter)
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else:
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# Booting from a cdrom directly allocated to the guest
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pass
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else:
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dev = self._prepare_kernel_and_initrd(guest, meter)
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if dev:
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self.install_devices.append(dev)
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def check_location(self):
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if self._location_is_path:
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# We already mostly validated this
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return True
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else:
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# This will throw an error for us
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OSDistro.detectMediaDistro(location=self.location, arch=self.arch)
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return True
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def detect_distro(self):
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try:
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dist_info = OSDistro.detectMediaDistro(location=self.location,
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arch=self.arch)
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except:
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logging.exception("Error attempting to detect distro.")
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return (None, None)
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# detectMediaDistro should only return valid values
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dtype, dvariant = dist_info
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return (dtype, dvariant)
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