Merge pull request #35 from ovsiannikov/componentversions

T688: parsing component version string

1 files changed, 57 insertions, 0 deletions

diff --git a/python/vyos/component_versions.py b/python/vyos/component_versions.py
new file mode 100644
index 000000000..ec54a1576
--- /dev/null
+++ b/python/vyos/component_versions.py
@@ -0,0 +1,57 @@
+# Copyright 2017 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/>.
+
+"""
+The version data looks like:
+
+/* Warning: Do not remove the following line. */
+/* === vyatta-config-version:
+"cluster@1:config-management@1:conntrack-sync@1:conntrack@1:dhcp-relay@1:dhcp-server@4:firewall@5:ipsec@4:nat@4:qos@1:quagga@2:system@8:vrrp@1:wanloadbalance@3:webgui@1:webproxy@1:zone-policy@1"
+=== */
+/* Release version: 1.2.0-rolling+201806131737 */
+"""
+
+import re
+
+def get_component_version(string_line):
+    """
+    Get component version dictionary from string
+    return empty dictionary if string contains no config information
+    or raise error if component version string malformed
+    """
+    return_value = {}
+    if re.match(r'/\* === vyatta-config-version:.+=== \*/$', string_line):
+
+        if not re.match(r'/\* === vyatta-config-version:\s+"([\w,-]+@\d+:)+([\w,-]+@\d+)"\s+=== \*/$', string_line):
+            raise ValueError("malformed configuration string: " + str(string_line))
+
+        for pair in re.findall(r'([\w,-]+)@(\d+)', string_line):
+            if pair[0] in return_value.keys():
+                raise ValueError("duplicate unit name: \"" + str(pair[0]) + "\" in string: \"" + string_line + "\"")
+            return_value[pair[0]] = int(pair[1])
+
+    return return_value
+
+
+def get_component_versions_from_file(config_file_name='/opt/vyatta/etc/config/config.boot'):
+    """
+    Get component version dictionary parsing config file line by line
+    """
+    f = open(config_file_name, 'r')
+    for line_in_config in f:
+        component_version = return_version(line_in_config)
+        if component_version:
+            return component_version
+    raise ValueError("no config string in file:", config_file_name)