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# Copyright 2019 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library 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 library 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 library. If not, see <http://www.gnu.org/licenses/>.
import sys
import os
import subprocess
import vyos.version
import vyos.defaults
import vyos.systemversions as systemversions
import vyos.formatversions as formatversions
class MigratorError(Exception):
pass
class Migrator(object):
def __init__(self, config_file, force=False, set_vintage='vyos'):
self._config_file = config_file
self._force = force
self._set_vintage = set_vintage
self._config_file_vintage = None
self._log_file = None
self._changed = False
def read_config_file_versions(self):
"""
Get component versions from config file footer and set vintage;
return empty dictionary if config string is missing.
"""
cfg_file = self._config_file
component_versions = {}
cfg_versions = formatversions.read_vyatta_versions(cfg_file)
if cfg_versions:
self._config_file_vintage = 'vyatta'
component_versions = cfg_versions
cfg_versions = formatversions.read_vyos_versions(cfg_file)
if cfg_versions:
self._config_file_vintage = 'vyos'
component_versions = cfg_versions
return component_versions
def update_vintage(self):
old_vintage = self._config_file_vintage
if self._set_vintage:
self._config_file_vintage = self._set_vintage
if not self._config_file_vintage:
self._config_file_vintage = vyos.defaults.cfg_vintage
if self._config_file_vintage not in ['vyatta', 'vyos']:
raise MigratorError("Unknown vintage.")
if self._config_file_vintage == old_vintage:
return False
else:
return True
def open_log_file(self):
"""
Open log file for migration, catching any error.
Note that, on boot, migration takes place before the canonical log
directory is created, hence write to the config file directory.
"""
self._log_file = os.path.join(vyos.defaults.directories['config'],
'vyos-migrate.log')
# on creation, allow write permission for cfg_group;
# restore original umask on exit
mask = os.umask(0o113)
try:
log = open('{0}'.format(self._log_file), 'w')
log.write("List of executed migration scripts:\n")
except Exception as e:
os.umask(mask)
print("Logging error: {0}".format(e))
return None
os.umask(mask)
return log
def run_migration_scripts(self, config_file_versions, system_versions):
"""
Run migration scripts iteratively, until config file version equals
system component version.
"""
log = self.open_log_file()
cfg_versions = config_file_versions
sys_versions = system_versions
sys_keys = list(sys_versions.keys())
sys_keys.sort()
rev_versions = {}
for key in sys_keys:
sys_ver = sys_versions[key]
if key in cfg_versions:
cfg_ver = cfg_versions[key]
else:
cfg_ver = 0
migrate_script_dir = os.path.join(
vyos.defaults.directories['migrate'], key)
while cfg_ver < sys_ver:
next_ver = cfg_ver + 1
migrate_script = os.path.join(migrate_script_dir,
'{}-to-{}'.format(cfg_ver, next_ver))
try:
subprocess.check_call([migrate_script,
self._config_file])
except FileNotFoundError:
pass
except Exception as err:
print("\nMigration script error: {0}: {1}."
"".format(migrate_script, err))
sys.exit(1)
if log:
try:
log.write('{0}\n'.format(migrate_script))
except Exception as e:
print("Error writing log: {0}".format(e))
cfg_ver = next_ver
rev_versions[key] = cfg_ver
if log:
log.close()
return rev_versions
def write_config_file_versions(self, cfg_versions):
"""
Write new versions string.
"""
versions_string = formatversions.format_versions_string(cfg_versions)
os_version_string = vyos.version.get_version()
if self._config_file_vintage == 'vyatta':
formatversions.write_vyatta_versions_foot(self._config_file,
versions_string,
os_version_string)
if self._config_file_vintage == 'vyos':
formatversions.write_vyos_versions_foot(self._config_file,
versions_string,
os_version_string)
def run(self):
"""
Gather component versions from config file and system.
Run migration scripts.
Update vintage ('vyatta' or 'vyos'), if needed.
If changed, remove old versions string from config file, and
write new versions string.
"""
cfg_file = self._config_file
cfg_versions = self.read_config_file_versions()
if self._force:
# This will force calling all migration scripts:
cfg_versions = {}
sys_versions = systemversions.get_system_versions()
rev_versions = self.run_migration_scripts(cfg_versions, sys_versions)
if rev_versions != cfg_versions:
self._changed = True
if self.update_vintage():
self._changed = True
if not self._changed:
return
formatversions.remove_versions(cfg_file)
self.write_config_file_versions(rev_versions)
def config_changed(self):
return self._changed
class VirtualMigrator(Migrator):
def run(self):
cfg_file = self._config_file
cfg_versions = self.read_config_file_versions()
if not cfg_versions:
raise MigratorError("Config file has no version information;"
" virtual migration not possible.")
if self.update_vintage():
self._changed = True
if not self._changed:
return
formatversions.remove_versions(cfg_file)
self.write_config_file_versions(cfg_versions)
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