1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
# 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=None):
self._config_file = config_file
self._force = force
self._set_vintage = set_vintage
self._config_file_vintage = 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 run_migration_scripts(self, config_file_versions, system_versions):
"""
Run migration scripts iteratively, until config file version equals
system component version.
"""
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_output([migrate_script,
self._config_file])
except FileNotFoundError:
pass
except subprocess.CalledProcessError as err:
print("Called process error: {}.".format(err))
sys.exit(1)
cfg_ver = next_ver
rev_versions[key] = cfg_ver
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)
class VirtualMigrator(Migrator):
def __init__(self, config_file, vintage='vyos'):
super().__init__(config_file, set_vintage = vintage)
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)
|
