tools: add qvm-template-postprocess

Tool to be called from template's rpm post-installation script.
This commit is contained in:
Marek Marczykowski-Górecki 2017-05-25 16:51:28 +02:00
parent 93d7249ef0
commit 2675d63579
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GPG Key ID: 063938BA42CFA724
3 changed files with 626 additions and 0 deletions

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@ -26,3 +26,8 @@ QREXEC_CLIENT = '/usr/lib/qubes/qrexec-client'
QREXEC_CLIENT_VM = '/usr/bin/qrexec-client-vm'
QUBESD_RECONNECT_DELAY = 1.0
QREXEC_SERVICES_DIR = '/etc/qubes-rpc'
defaults = {
'template_label': 'black',
'shutdown_timeout': 60,
}

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@ -0,0 +1,392 @@
# -*- encoding: utf8 -*-
#
# The Qubes OS Project, http://www.qubes-os.org
#
# Copyright (C) 2017 Marek Marczykowski-Górecki
# <marmarek@invisiblethingslab.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with this program; if not, see <http://www.gnu.org/licenses/>.
import asyncio
import os
import subprocess
import tempfile
from unittest import mock
import qubesadmin.tests
import qubesadmin.tools.qvm_template_postprocess
class QubesLocalMock(qubesadmin.tests.QubesTest):
def __init__(self):
super(QubesLocalMock, self).__init__()
self.__class__ = qubesadmin.app.QubesLocal
qubesd_call = qubesadmin.tests.QubesTest.qubesd_call
run_service = qubesadmin.tests.QubesTest.run_service
class TC_00_qvm_template_postprocess(qubesadmin.tests.QubesTestCase):
def setUp(self):
super(TC_00_qvm_template_postprocess, self).setUp()
self.source_dir = tempfile.TemporaryDirectory()
def tearDown(self):
try:
self.source_dir.cleanup()
except FileNotFoundError:
pass
super(TC_00_qvm_template_postprocess, self).tearDown()
def test_000_import_root_img_raw(self):
root_img = os.path.join(self.source_dir.name, 'root.img')
volume_data = b'volume data'
with open(root_img, 'wb') as f:
f.write(volume_data)
self.app.expected_calls[('dom0', 'admin.vm.List', None, None)] = \
b'0\0test-vm class=TemplateVM state=Halted\n'
self.app.expected_calls[('test-vm', 'admin.vm.volume.List', None,
None)] = \
b'0\0root\nprivate\nvolatile\nkernel\n'
self.app.expected_calls[('test-vm', 'admin.vm.volume.Resize', 'root',
str(len(volume_data)).encode())] = \
b'0\0'
self.app.expected_calls[('test-vm', 'admin.vm.volume.Import', 'root',
volume_data)] = b'0\0'
vm = self.app.domains['test-vm']
qubesadmin.tools.qvm_template_postprocess.import_root_img(
vm, self.source_dir.name)
self.assertAllCalled()
def test_001_import_root_img_tar(self):
root_img = os.path.join(self.source_dir.name, 'root.img')
volume_data = b'volume data' * 1000
with open(root_img, 'wb') as f:
f.write(volume_data)
subprocess.check_call(['tar', 'cf', 'root.img.tar', 'root.img'],
cwd=self.source_dir.name)
subprocess.check_call(['split', '-d', '-b', '1024', 'root.img.tar',
'root.img.part.'], cwd=self.source_dir.name)
os.unlink(root_img)
self.app.expected_calls[('dom0', 'admin.vm.List', None, None)] = \
b'0\0test-vm class=TemplateVM state=Halted\n'
self.app.expected_calls[('test-vm', 'admin.vm.volume.List', None,
None)] = \
b'0\0root\nprivate\nvolatile\nkernel\n'
self.app.expected_calls[('test-vm', 'admin.vm.volume.Resize', 'root',
str(len(volume_data)).encode())] = \
b'0\0'
self.app.expected_calls[('test-vm', 'admin.vm.volume.Import', 'root',
volume_data)] = b'0\0'
vm = self.app.domains['test-vm']
qubesadmin.tools.qvm_template_postprocess.import_root_img(
vm, self.source_dir.name)
self.assertAllCalled()
def test_002_import_root_img_no_overwrite(self):
self.app.qubesd_connection_type = 'socket'
template_dir = os.path.join(self.source_dir.name, 'vm-templates',
'test-vm')
os.makedirs(template_dir)
root_img = os.path.join(template_dir, 'root.img')
volume_data = b'volume data'
with open(root_img, 'wb') as f:
f.write(volume_data)
self.app.expected_calls[('dom0', 'admin.vm.List', None, None)] = \
b'0\0test-vm class=TemplateVM state=Halted\n'
self.app.expected_calls[
('test-vm', 'admin.vm.volume.List', None, None)] = \
b'0\0root\nprivate\nvolatile\nkernel\n'
self.app.expected_calls[
('test-vm', 'admin.vm.volume.Info', 'root', None)] = \
b'0\0pool=default\nvid=vm-templates/test-vm/root\n'
self.app.expected_calls[
('dom0', 'admin.pool.List', None, None)] = \
b'0\0default\n'
self.app.expected_calls[
('dom0', 'admin.pool.Info', 'default', None)] = \
b'0\0driver=file\ndir_path=' + self.source_dir.name.encode() + b'\n'
self.app.expected_calls[
('test-vm', 'admin.vm.volume.Resize', 'root',
str(len(volume_data)).encode())] = \
b'0\0'
vm = self.app.domains['test-vm']
qubesadmin.tools.qvm_template_postprocess.import_root_img(
vm, template_dir)
self.assertAllCalled()
def test_010_import_appmenus(self):
with open(os.path.join(self.source_dir.name,
'vm-whitelisted-appmenus.list'), 'w') as f:
f.write('org.gnome.Terminal.desktop\n')
f.write('firefox.desktop\n')
with open(os.path.join(self.source_dir.name,
'whitelisted-appmenus.list'), 'w') as f:
f.write('org.gnome.Terminal.desktop\n')
f.write('org.gnome.Software.desktop\n')
f.write('gnome-control-center.desktop\n')
self.app.expected_calls[('dom0', 'admin.vm.List', None, None)] = \
b'0\0test-vm class=TemplateVM state=Halted\n'
vm = self.app.domains['test-vm']
with mock.patch('subprocess.check_call') as mock_proc:
qubesadmin.tools.qvm_template_postprocess.import_appmenus(
vm, self.source_dir.name)
self.assertEqual(mock_proc.mock_calls, [
mock.call(['qvm-appmenus',
'--set-default-whitelist=' + os.path.join(self.source_dir.name,
'vm-whitelisted-appmenus.list'), 'test-vm']),
mock.call(['qvm-appmenus', '--set-whitelist=' + os.path.join(
self.source_dir.name, 'whitelisted-appmenus.list'), 'test-vm']),
])
self.assertAllCalled()
@mock.patch('grp.getgrnam')
@mock.patch('os.getuid')
def test_011_import_appmenus_as_root(self, mock_getuid, mock_getgrnam):
with open(os.path.join(self.source_dir.name,
'vm-whitelisted-appmenus.list'), 'w') as f:
f.write('org.gnome.Terminal.desktop\n')
f.write('firefox.desktop\n')
with open(os.path.join(self.source_dir.name,
'whitelisted-appmenus.list'), 'w') as f:
f.write('org.gnome.Terminal.desktop\n')
f.write('org.gnome.Software.desktop\n')
f.write('gnome-control-center.desktop\n')
self.app.expected_calls[('dom0', 'admin.vm.List', None, None)] = \
b'0\0test-vm class=TemplateVM state=Halted\n'
mock_getuid.return_value = 0
mock_getgrnam.configure_mock(**{
'return_value.gr_mem.__getitem__.return_value': 'user'
})
vm = self.app.domains['test-vm']
with mock.patch('subprocess.check_call') as mock_proc:
qubesadmin.tools.qvm_template_postprocess.import_appmenus(
vm, self.source_dir.name)
self.assertEqual(mock_proc.mock_calls, [
mock.call(['runuser', '-u', 'user', '--', 'env', 'DISPLAY=:0',
'qvm-appmenus',
'--set-default-whitelist=' + os.path.join(self.source_dir.name,
'vm-whitelisted-appmenus.list'), 'test-vm']),
mock.call(['runuser', '-u', 'user', '--', 'env', 'DISPLAY=:0',
'qvm-appmenus', '--set-whitelist=' + os.path.join(
self.source_dir.name, 'whitelisted-appmenus.list'), 'test-vm']),
])
self.assertAllCalled()
@mock.patch('grp.getgrnam')
@mock.patch('os.getuid')
def test_012_import_appmenus_missing_user(self, mock_getuid, mock_getgrnam):
with open(os.path.join(self.source_dir.name,
'vm-whitelisted-appmenus.list'), 'w') as f:
f.write('org.gnome.Terminal.desktop\n')
f.write('firefox.desktop\n')
with open(os.path.join(self.source_dir.name,
'whitelisted-appmenus.list'), 'w') as f:
f.write('org.gnome.Terminal.desktop\n')
f.write('org.gnome.Software.desktop\n')
f.write('gnome-control-center.desktop\n')
self.app.expected_calls[('dom0', 'admin.vm.List', None, None)] = \
b'0\0test-vm class=TemplateVM state=Halted\n'
mock_getuid.return_value = 0
mock_getgrnam.side_effect = KeyError
vm = self.app.domains['test-vm']
with mock.patch('subprocess.check_call') as mock_proc:
qubesadmin.tools.qvm_template_postprocess.import_appmenus(
vm, self.source_dir.name)
self.assertEqual(mock_proc.mock_calls, [])
self.assertAllCalled()
def add_new_vm_side_effect(self, *args, **kwargs):
self.app.expected_calls[('dom0', 'admin.vm.List', None, None)] = \
b'0\0test-vm class=TemplateVM state=Halted\n'
self.app.domains.clear_cache()
return self.app.domains['test-vm']
@mock.patch('qubesadmin.tools.qvm_template_postprocess.import_appmenus')
@mock.patch('qubesadmin.tools.qvm_template_postprocess.import_root_img')
def test_020_post_install(self, mock_import_root_img,
mock_import_appmenus):
self.app.expected_calls[('dom0', 'admin.vm.List', None, None)] = \
b'0\0'
self.app.add_new_vm = mock.Mock(side_effect=self.add_new_vm_side_effect)
self.app.expected_calls[
('test-vm', 'admin.vm.property.Set', 'netvm', b'')] = b'0\0'
self.app.expected_calls[
('test-vm', 'admin.vm.property.Reset', 'netvm', None)] = b'0\0'
self.app.expected_calls[
('test-vm', 'admin.vm.Start', None, None)] = b'0\0'
self.app.expected_calls[
('test-vm', 'admin.vm.Shutdown', None, None)] = b'0\0'
if qubesadmin.tools.qvm_template_postprocess.have_events:
patch_domain_shutdown = mock.patch(
'qubesadmin.events.utils.wait_for_domain_shutdown')
self.addCleanup(patch_domain_shutdown.stop)
mock_domain_shutdown = patch_domain_shutdown.start()
else:
self.app.expected_calls[
('test-vm', 'admin.vm.List', None, None)] = \
b'0\0test-vm class=TemplateVM state=Halted\n'
ret = qubesadmin.tools.qvm_template_postprocess.main([
'--really', 'post-install', 'test-vm', self.source_dir.name],
app=self.app)
self.assertEqual(ret, 0)
self.app.add_new_vm.assert_called_once_with('TemplateVM',
name='test-vm', label='black')
mock_import_root_img.assert_called_once_with(self.app.domains[
'test-vm'], self.source_dir.name)
mock_import_appmenus.assert_called_once_with(self.app.domains[
'test-vm'], self.source_dir.name)
if qubesadmin.tools.qvm_template_postprocess.have_events:
mock_domain_shutdown.assert_called_once_with(self.app.domains[
'test-vm'], 60)
self.assertEqual(self.app.service_calls, [
('test-vm', 'qubes.PostInstall', {}),
('test-vm', 'qubes.PostInstall', b''),
])
self.assertAllCalled()
@mock.patch('qubesadmin.tools.qvm_template_postprocess.import_appmenus')
@mock.patch('qubesadmin.tools.qvm_template_postprocess.import_root_img')
def test_021_post_install_reinstall(self, mock_import_root_img,
mock_import_appmenus):
self.app.expected_calls[('dom0', 'admin.vm.List', None, None)] = \
b'0\0test-vm class=TemplateVM state=Halted\n'
self.app.add_new_vm = mock.Mock()
self.app.expected_calls[
('test-vm', 'admin.vm.property.Set', 'netvm', b'')] = b'0\0'
self.app.expected_calls[
('test-vm', 'admin.vm.property.Reset', 'netvm', None)] = b'0\0'
self.app.expected_calls[
('test-vm', 'admin.vm.Start', None, None)] = b'0\0'
self.app.expected_calls[
('test-vm', 'admin.vm.Shutdown', None, None)] = b'0\0'
if qubesadmin.tools.qvm_template_postprocess.have_events:
patch_domain_shutdown = mock.patch(
'qubesadmin.events.utils.wait_for_domain_shutdown')
self.addCleanup(patch_domain_shutdown.stop)
mock_domain_shutdown = patch_domain_shutdown.start()
else:
self.app.expected_calls[
('test-vm', 'admin.vm.List', None, None)] = \
b'0\0test-vm class=TemplateVM state=Halted\n'
ret = qubesadmin.tools.qvm_template_postprocess.main([
'--really', 'post-install', 'test-vm', self.source_dir.name],
app=self.app)
self.assertEqual(ret, 0)
self.assertFalse(self.app.add_new_vm.called)
mock_import_root_img.assert_called_once_with(self.app.domains[
'test-vm'], self.source_dir.name)
mock_import_appmenus.assert_called_once_with(self.app.domains[
'test-vm'], self.source_dir.name)
if qubesadmin.tools.qvm_template_postprocess.have_events:
mock_domain_shutdown.assert_called_once_with(self.app.domains[
'test-vm'], 60)
self.assertEqual(self.app.service_calls, [
('test-vm', 'qubes.PostInstall', {}),
('test-vm', 'qubes.PostInstall', b''),
])
self.assertAllCalled()
@mock.patch('qubesadmin.tools.qvm_template_postprocess.import_appmenus')
@mock.patch('qubesadmin.tools.qvm_template_postprocess.import_root_img')
def test_022_post_install_skip_start(self, mock_import_root_img,
mock_import_appmenus):
self.app.expected_calls[('dom0', 'admin.vm.List', None, None)] = \
b'0\0test-vm class=TemplateVM state=Halted\n'
self.app.add_new_vm = mock.Mock()
if qubesadmin.tools.qvm_template_postprocess.have_events:
patch_domain_shutdown = mock.patch(
'qubesadmin.events.utils.wait_for_domain_shutdown')
self.addCleanup(patch_domain_shutdown.stop)
mock_domain_shutdown = patch_domain_shutdown.start()
ret = qubesadmin.tools.qvm_template_postprocess.main([
'--really', '--skip-start', 'post-install', 'test-vm',
self.source_dir.name],
app=self.app)
self.assertEqual(ret, 0)
self.assertFalse(self.app.add_new_vm.called)
mock_import_root_img.assert_called_once_with(self.app.domains[
'test-vm'], self.source_dir.name)
mock_import_appmenus.assert_called_once_with(self.app.domains[
'test-vm'], self.source_dir.name)
if qubesadmin.tools.qvm_template_postprocess.have_events:
self.assertFalse(mock_domain_shutdown.called)
self.assertEqual(self.app.service_calls, [])
self.assertAllCalled()
def test_030_pre_remove(self):
self.app.expected_calls[('dom0', 'admin.vm.List', None, None)] = \
b'0\0test-vm class=TemplateVM state=Halted\n'
self.app.expected_calls[('test-vm', 'admin.vm.Remove', None, None)] = \
b'0\0'
self.app.expected_calls[
('test-vm', 'admin.vm.property.Get', 'template', None)] = \
b'2\0QubesNoSuchPropertyError\0\0invalid property \'template\' of ' \
b'test-vm\0'
ret = qubesadmin.tools.qvm_template_postprocess.main([
'--really', 'pre-remove', 'test-vm',
self.source_dir.name],
app=self.app)
self.assertEqual(ret, 0)
self.assertEqual(self.app.service_calls, [])
self.assertAllCalled()
def test_031_pre_remove_existing_appvm(self):
self.app.expected_calls[('dom0', 'admin.vm.List', None, None)] = \
b'0\0test-vm class=TemplateVM state=Halted\n' \
b'test-vm2 class=AppVM state=Halted\n'
self.app.expected_calls[
('test-vm', 'admin.vm.property.Get', 'template', None)] = \
b'2\0QubesNoSuchPropertyError\0\0invalid property \'template\' of ' \
b'test-vm\0'
self.app.expected_calls[
('test-vm2', 'admin.vm.property.Get', 'template', None)] = \
b'0\0default=no type=vm test-vm'
with self.assertRaises(SystemExit):
qubesadmin.tools.qvm_template_postprocess.main([
'--really', 'pre-remove', 'test-vm',
self.source_dir.name],
app=self.app)
self.assertEqual(self.app.service_calls, [])
self.assertAllCalled()
def test_040_missing_really(self):
with self.assertRaises(SystemExit):
qubesadmin.tools.qvm_template_postprocess.main([
'post-install', 'test-vm', self.source_dir.name],
app=self.app)
self.assertAllCalled()

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@ -0,0 +1,229 @@
#
# The Qubes OS Project, https://www.qubes-os.org/
#
# Copyright (C) 2016 Marek Marczykowski-Górecki
# <marmarek@invisiblethingslab.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser 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.
''' Tool for importing rpm-installed template'''
import asyncio
import glob
import os
import shutil
import subprocess
import sys
import grp
import time
import qubesadmin
import qubesadmin.exc
import qubesadmin.tools
try:
# pylint: disable=wrong-import-position
import qubesadmin.events.utils
have_events = True
except ImportError:
have_events = False
parser = qubesadmin.tools.QubesArgumentParser(
description='Postprocess template package')
parser.add_argument('--really', action='store_true', default=False,
help='Really perform the action, YOU SHOULD REALLY KNOW WHAT YOU ARE DOING')
parser.add_argument('--skip-start', action='store_true',
help='Do not start the VM - do not retrieve menu entries etc.')
parser.add_argument('--keep-source', action='store_true',
help='Do not remove imported data')
parser.add_argument('action', choices=['post-install', 'pre-remove'],
help='Action to perform')
parser.add_argument('name', action='store',
help='Template name')
parser.add_argument('dir', action='store',
help='Template directory')
def move_if_exists(source, dest_dir):
'''Move file/directory if exists'''
if os.path.exists(source):
shutil.move(source, os.path.join(dest_dir, os.path.basename(source)))
def get_root_img_size(source_dir):
'''Extract size of root.img to be imported'''
root_path = os.path.join(source_dir, 'root.img')
if os.path.exists(root_path + '.part.00'):
# get just file root_size from the tar header
p = subprocess.Popen(['tar', 'tvf', root_path + '.part.00'],
stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)
(stdout, _) = p.communicate()
# -rw-r--r-- 0/0 1073741824 1970-01-01 01:00 root.img
root_size = int(stdout.split()[2])
elif os.path.exists(root_path):
root_size = os.path.getsize(root_path)
else:
raise qubesadmin.exc.QubesException('root.img not found')
return root_size
def import_root_img(vm, source_dir):
'''Import root.img into VM object'''
root_size = get_root_img_size(source_dir)
vm.volumes['root'].resize(root_size)
root_path = os.path.join(source_dir, 'root.img')
if os.path.exists(root_path + '.part.00'):
input_files = glob.glob(root_path + '.part.*')
cat = subprocess.Popen(['cat'] + sorted(input_files),
stdout=subprocess.PIPE)
tar = subprocess.Popen(['tar', 'xSOf', '-'],
stdin=cat.stdout,
stdout=subprocess.PIPE)
vm.volumes['root'].import_data(stream=tar.stdout)
if tar.wait() != 0:
raise qubesadmin.exc.QubesException('root.img extraction failed')
if cat.wait() != 0:
raise qubesadmin.exc.QubesException('root.img extraction failed')
cat.stdout.close()
tar.stdout.close()
elif os.path.exists(root_path):
if vm.app.qubesd_connection_type == 'socket':
# check if root.img was already overwritten, i.e. if the source
# and destination paths are the same
vid = vm.volumes['root'].vid
pool = vm.app.pools[vm.volumes['root'].pool]
if pool.driver == 'file' and root_path == os.path.join(
pool.config['dir_path'], vid + '.img'):
vm.log.info('root.img already in place, do not re-import')
return
with open(root_path, 'rb') as root_file:
vm.volumes['root'].import_data(stream=root_file)
def import_appmenus(vm, source_dir):
'''Import appmenus settings into VM object (later: GUI VM)'''
if os.getuid() == 0:
try:
qubes_group = grp.getgrnam('qubes')
user = qubes_group.gr_mem[0]
cmd_prefix = ['runuser', '-u', user, '--', 'env', 'DISPLAY=:0']
except KeyError as e:
vm.log.warning('Default user not found, not importing appmenus: ' +
str(e))
return
else:
cmd_prefix = []
# TODO: change this to qrexec calls to GUI VM, when GUI VM will be
# implemented
subprocess.check_call(cmd_prefix + ['qvm-appmenus',
'--set-default-whitelist={}'.format(os.path.join(source_dir,
'vm-whitelisted-appmenus.list')), vm.name])
subprocess.check_call(cmd_prefix + ['qvm-appmenus',
'--set-whitelist={}'.format(os.path.join(source_dir,
'whitelisted-appmenus.list')), vm.name])
def post_install(args):
'''Handle post-installation tasks'''
app = args.app
try:
# reinstall
vm = app.domains[args.name]
except KeyError:
if app.qubesd_connection_type == 'socket' and \
args.dir == '/var/lib/qubes/vm-templates/' + args.name:
# vm.create_on_disk() need to create the directory on its own,
# move it away for from its way
tmp_sourcedir = os.path.join('/var/lib/qubes/vm-templates',
'tmp-' + args.name)
shutil.move(args.dir, tmp_sourcedir)
args.dir = tmp_sourcedir
vm = app.add_new_vm('TemplateVM',
name=args.name,
label=qubesadmin.config.defaults['template_label'])
vm.log.info('Importing data')
import_root_img(vm, args.dir)
import_appmenus(vm, args.dir)
if not args.skip_start:
# just created, so no need to save previous value - we know what it was
vm.netvm = None
vm.start()
try:
vm.run_service_for_stdio('qubes.PostInstall')
except qubesadmin.exc.QubesVMError:
vm.log.error('qubes.PostInstall service failed')
vm.shutdown()
if have_events:
try:
# pylint: disable=no-member
qubesadmin.events.utils.wait_for_domain_shutdown(vm,
qubesadmin.config.defaults['shutdown_timeout'])
except qubesadmin.exc.QubesVMShutdownTimeout:
vm.kill()
asyncio.get_event_loop().close()
else:
timeout = qubesadmin.config.defaults['shutdown_timeout']
while timeout >= 0:
if vm.is_halted():
break
time.sleep(1)
timeout -= 1
if not vm.is_halted():
vm.kill()
vm.netvm = qubesadmin.DEFAULT
return 0
def pre_remove(args):
'''Handle pre-removal tasks'''
app = args.app
try:
tpl = app.domains[args.name]
except KeyError:
parser.error('Qube with this name do not exist')
for appvm in tpl.appvms:
parser.error('Qube {} use this template'.format(appvm.name))
del app.domains[args.name]
return 0
def main(args=None, app=None):
'''Main function of qvm-template-postprocess'''
args = parser.parse_args(args, app=app)
if not args.really:
parser.error('Do not call this tool directly.')
if args.action == 'post-install':
return post_install(args)
elif args.action == 'pre-remove':
pre_remove(args)
else:
parser.error('Unknown action')
return 0
if __name__ == '__main__':
sys.exit(main())