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virt-manager/virtManager/delete.py
Cole Robinson 5e9e444dec connection: Do non-VM polling on demand 
The goal here is to reduce the amount of tick() polling that we do by default.
For things like pools, networks, and interfaces, the constant polling is
not very helpful and causes CPU churn and slowness for remote connections.

Switch to a more on demand style. Pages that want new information for
these objects now request a priority tick that only refreshes the info
we want.

This isn't perfect, but neither was the previous solution in the face of
things like XML updates behind our back. The real solution here is libvirt
event support across the board.
2013-07-07 12:17:54 -04:00

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#
# Copyright (C) 2009, 2012 Red Hat, Inc.
# Copyright (C) 2009 Cole Robinson <crobinso@redhat.com>
#
# 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.
#
# pylint: disable=E0611
from gi.repository import Gtk
from gi.repository import Gdk
# pylint: enable=E0611
import os
import stat
import traceback
import logging
import virtinst
from virtManager import util
from virtManager.baseclass import vmmGObjectUI
from virtManager.asyncjob import vmmAsyncJob
STORAGE_ROW_CONFIRM = 0
STORAGE_ROW_CANT_DELETE = 1
STORAGE_ROW_PATH = 2
STORAGE_ROW_TARGET = 3
STORAGE_ROW_ICON_SHOW = 4
STORAGE_ROW_ICON = 5
STORAGE_ROW_ICON_SIZE = 6
STORAGE_ROW_TOOLTIP = 7
class vmmDeleteDialog(vmmGObjectUI):
def __init__(self):
vmmGObjectUI.__init__(self, "vmm-delete.ui", "vmm-delete")
self.vm = None
self.conn = None
self.builder.connect_signals({
"on_vmm_delete_delete_event" : self.close,
"on_delete_cancel_clicked" : self.close,
"on_delete_ok_clicked" : self.finish,
"on_delete_remove_storage_toggled" : self.toggle_remove_storage,
})
self.bind_escape_key_close()
image = Gtk.Image.new_from_icon_name("vm_delete_wizard",
Gtk.IconSize.DIALOG)
image.show()
self.widget("icon-box").pack_end(image, False, False, False)
prepare_storage_list(self.widget("delete-storage-list"))
def toggle_remove_storage(self, src):
dodel = src.get_active()
self.widget("delete-storage-list").set_sensitive(dodel)
def show(self, vm, parent):
logging.debug("Showing delete wizard")
self.vm = vm
self.conn = vm.conn
self.reset_state()
self.topwin.set_transient_for(parent)
self.topwin.present()
def close(self, ignore1=None, ignore2=None):
logging.debug("Closing delete wizard")
self.topwin.hide()
self.vm = None
self.conn = None
return 1
def _cleanup(self):
self.vm = None
self.conn = None
def reset_state(self):
# Set VM name in title'
title_str = ("<span size='x-large'>%s '%s'</span>" %
(_("Delete"), util.xml_escape(self.vm.get_name())))
self.widget("delete-main-label").set_markup(title_str)
self.widget("delete-cancel").grab_focus()
# Show warning message if VM is running
vm_active = self.vm.is_active()
self.widget("delete-warn-running-vm-box").set_visible(vm_active)
# Disable storage removal by default
self.widget("delete-remove-storage").set_active(True)
self.widget("delete-remove-storage").toggled()
populate_storage_list(self.widget("delete-storage-list"),
self.vm, self.conn)
def get_config_format(self):
format_combo = self.widget("vol-format")
model = format_combo.get_model()
if format_combo.get_active_iter() is not None:
model = format_combo.get_model()
return model.get_value(format_combo.get_active_iter(), 0)
return None
def get_paths_to_delete(self):
del_list = self.widget("delete-storage-list")
model = del_list.get_model()
paths = []
if self.widget("delete-remove-storage").get_active():
for row in model:
if (not row[STORAGE_ROW_CANT_DELETE] and
row[STORAGE_ROW_CONFIRM]):
paths.append(row[STORAGE_ROW_PATH])
return paths
def finish(self, src_ignore):
devs = self.get_paths_to_delete()
if devs:
ret = util.chkbox_helper(self,
self.config.get_confirm_delstorage,
self.config.set_confirm_delstorage,
text1=_("Are you sure you want to delete "
"the storage?"),
text2=_("All selected storage will "
"be deleted."))
if not ret:
return
self.topwin.set_sensitive(False)
self.topwin.get_window().set_cursor(Gdk.Cursor.new(Gdk.CursorType.WATCH))
title = _("Deleting virtual machine '%s'") % self.vm.get_name()
text = title
if devs:
text = title + _(" and selected storage (this may take a while)")
progWin = vmmAsyncJob(self._async_delete, [devs],
title, text, self.topwin)
error, details = progWin.run()
self.topwin.set_sensitive(True)
self.topwin.get_window().set_cursor(Gdk.Cursor.new(Gdk.CursorType.TOP_LEFT_ARROW))
if error is not None:
self.err.show_err(error, details=details)
self.conn.schedule_priority_tick(pollvm=True)
self.close()
def _async_delete(self, asyncjob, paths):
storage_errors = []
details = ""
try:
if self.vm.is_active():
logging.debug("Forcing VM '%s' power off.", self.vm.get_name())
self.vm.destroy()
conn = self.conn.get_backend()
meter = asyncjob.get_meter()
for path in paths:
try:
logging.debug("Deleting path: %s", path)
meter.start(text=_("Deleting path '%s'") % path)
self._async_delete_path(conn, path, meter)
except Exception, e:
storage_errors.append((str(e),
"".join(traceback.format_exc())))
meter.end(0)
logging.debug("Removing VM '%s'", self.vm.get_name())
self.vm.delete()
except Exception, e:
error = (_("Error deleting virtual machine '%s': %s") %
(self.vm.get_name(), str(e)))
details = "".join(traceback.format_exc())
storage_errstr = ""
for errinfo in storage_errors:
storage_errstr += "%s\n%s\n" % (errinfo[0], errinfo[1])
if not storage_errstr and not details:
return
# We had extra storage errors. If there was another error message,
# errors to it. Otherwise, build the main error around them.
if details:
details += "\n\n"
details += _("Additionally, there were errors removing"
" certain storage devices: \n")
details += storage_errstr
else:
error = _("Errors encountered while removing certain "
"storage devices.")
details = storage_errstr
if error:
asyncjob.set_error(error, details)
def _async_delete_path(self, conn, path, ignore):
vol = None
try:
vol = conn.storageVolLookupByPath(path)
except:
logging.debug("Path '%s' is not managed. Deleting locally", path)
if vol:
vol.delete(0)
else:
os.unlink(path)
def populate_storage_list(storage_list, vm, conn):
model = storage_list.get_model()
model.clear()
for disk in vm.get_disk_devices():
vol = None
target = disk.target
path = disk.path
ro = disk.read_only
shared = disk.shareable
# There are a few pieces here
# 1) Can we even delete the storage? If not, make the checkbox
# inconsistent. self.can_delete decides this for us, and if
# we can't delete, gives us a nice message to show the user
# for that row.
#
# 2) If we can delete, do we want to delete this storage by
# default? Reasons not to, are if the storage is marked
# readonly or sharable, or is in use by another VM.
if not path:
continue
default = False
definfo = None
vol = conn.get_vol_by_path(path)
can_del, delinfo = can_delete(conn, vol, path)
if can_del:
default, definfo = do_we_default(conn, vm.get_name(), vol,
path, ro, shared)
info = None
if not can_del:
info = delinfo
elif not default:
info = definfo
icon = Gtk.STOCK_DIALOG_WARNING
icon_size = Gtk.IconSize.LARGE_TOOLBAR
row = [default, not can_del, path, target,
bool(info), icon, icon_size, info]
model.append(row)
def prepare_storage_list(storage_list):
# Checkbox, deleteable?, storage path, target (hda), icon stock,
# icon size, tooltip
model = Gtk.ListStore(bool, bool, str, str, bool, str, int, str)
storage_list.set_model(model)
storage_list.set_tooltip_column(STORAGE_ROW_TOOLTIP)
confirmCol = Gtk.TreeViewColumn()
pathCol = Gtk.TreeViewColumn(_("Storage Path"))
targetCol = Gtk.TreeViewColumn(_("Target"))
infoCol = Gtk.TreeViewColumn()
storage_list.append_column(confirmCol)
storage_list.append_column(pathCol)
storage_list.append_column(targetCol)
storage_list.append_column(infoCol)
chkbox = Gtk.CellRendererToggle()
chkbox.connect('toggled', storage_item_toggled, storage_list)
confirmCol.pack_start(chkbox, False)
confirmCol.add_attribute(chkbox, 'active', STORAGE_ROW_CONFIRM)
confirmCol.add_attribute(chkbox, 'inconsistent',
STORAGE_ROW_CANT_DELETE)
confirmCol.set_sort_column_id(STORAGE_ROW_CANT_DELETE)
path_txt = Gtk.CellRendererText()
pathCol.pack_start(path_txt, True)
pathCol.add_attribute(path_txt, 'text', STORAGE_ROW_PATH)
pathCol.set_sort_column_id(STORAGE_ROW_PATH)
target_txt = Gtk.CellRendererText()
targetCol.pack_start(target_txt, False)
targetCol.add_attribute(target_txt, 'text', STORAGE_ROW_TARGET)
targetCol.set_sort_column_id(STORAGE_ROW_TARGET)
info_img = Gtk.CellRendererPixbuf()
infoCol.pack_start(info_img, False)
infoCol.add_attribute(info_img, 'visible', STORAGE_ROW_ICON_SHOW)
infoCol.add_attribute(info_img, 'stock-id', STORAGE_ROW_ICON)
infoCol.add_attribute(info_img, 'stock-size', STORAGE_ROW_ICON_SIZE)
infoCol.set_sort_column_id(STORAGE_ROW_ICON)
def storage_item_toggled(src, index, storage_list):
active = src.get_active()
model = storage_list.get_model()
model[index][STORAGE_ROW_CONFIRM] = not active
def can_delete(conn, vol, path):
"""Is the passed path even deleteable"""
ret = True
msg = None
if vol:
# Managed storage
if (vol.get_pool().get_type() ==
virtinst.Storage.StoragePool.TYPE_ISCSI):
msg = _("Cannot delete iscsi share.")
else:
if conn.is_remote():
msg = _("Cannot delete unmanaged remote storage.")
elif not os.path.exists(path):
msg = _("Path does not exist.")
elif not os.access(os.path.dirname(path), os.W_OK):
msg = _("No write access to parent directory.")
elif stat.S_ISBLK(os.stat(path)[stat.ST_MODE]):
msg = _("Cannot delete unmanaged block device.")
if msg:
ret = False
return (ret, msg)
def do_we_default(conn, vm_name, vol, path, ro, shared):
""" Returns (do we delete by default?, info string if not)"""
info = ""
def append_str(str1, str2, delim="\n"):
if not str2:
return str1
if str1:
str1 += delim
str1 += str2
return str1
if ro:
info = append_str(info, _("Storage is read-only."))
elif not vol and not os.access(path, os.W_OK):
info = append_str(info, _("No write access to path."))
if shared:
info = append_str(info, _("Storage is marked as shareable."))
try:
names = virtinst.VirtualDisk.path_in_use_by(conn.get_backend(), path)
if len(names) > 1:
namestr = ""
names.remove(vm_name)
for name in names:
namestr = append_str(namestr, name, delim="\n- ")
info = append_str(info, _("Storage is in use by the following "
"virtual machines:\n- %s " % namestr))
except Exception, e:
logging.exception("Failed checking disk conflict: %s", str(e))
return (not info, info)
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