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#!/usr/bin/python
#
# Copyright (c) [2011-2014] Novell, Inc.
#
# All Rights Reserved.
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of version 2 of the GNU General Public License as published
# by the Free Software Foundation.
#
# 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, contact Novell, Inc.
#
# To contact Novell about this file by physical or electronic mail, you may
# find current contact information at www.novell.com.
#
# Author: Arvin Schnell <aschnell@suse.de>
#
from os import readlink, getppid
from os.path import basename
import sys
import fnmatch
import re
import logging
from dbus import SystemBus, Interface, DBusException
import xml.dom.minidom as minidom
import xml.parsers.expat as expat
import json
from zypp_plugin import Plugin
class Solvable:
def __init__(self, pattern, important):
self.pattern = re.compile(pattern)
self.important = important
def __repr__(self):
return "pattern:%s important:%s" % (self.pattern, self.important)
def match(self, name):
return self.pattern.match(name)
class Config:
def __init__(self):
self.solvables = []
self.load_file("/etc/snapper/zypp-plugin.conf")
def load_file(self, filename):
try:
self.load_dom(minidom.parse(filename))
except IOError:
logging.error("failed to open %s" % filename)
except expat.ExpatError:
logging.error("failed to parse %s" % filename)
except:
logging.error("failed to load %s" % filename)
def load_dom(self, dom):
try:
for tmp1 in dom.getElementsByTagName("solvables"):
for tmp2 in tmp1.getElementsByTagName("solvable"):
pattern = tmp2.childNodes[0].data
match = tmp2.getAttribute("match")
important = tmp2.getAttribute("important") == "true"
if not match in [ "w", "re" ]:
logging.error("unknown match attribute %s" % match)
continue
if match == "w":
pattern = fnmatch.translate(pattern)
self.solvables.append(Solvable(pattern, important))
except:
pass
class MyPlugin(Plugin):
def __init__(self):
Plugin.__init__(self)
self.num1 = self.num2 = None
self.description = ""
self.cleanup = "number"
self.userdata = {}
def parse_userdata(self, s):
userdata = {}
for kv in s.split(","):
k, v = kv.split("=", 1)
k = k.strip()
if not k:
raise ValueError
userdata[k] = v.strip()
return userdata
def get_userdata(self, headers):
try:
return self.parse_userdata(headers['userdata'])
except KeyError:
pass
except ValueError:
logging.error("invalid userdata")
return {}
def get_solvables(self, body, todo):
tmp = json.loads(body)
tsl = tmp["TransactionStepList"]
solvables = set()
for ts in tsl:
if "type" in ts:
if todo or "stage" in ts:
solvables.add(ts["solvable"]["n"])
return solvables
def match_solvables(self, names):
found = important = False
for name in names:
for solvable in config.solvables:
if solvable.match(name):
found = True
important = important or solvable.important
if found and important:
return True, True
return found, important
def PLUGINBEGIN(self, headers, body):
logging.info("PLUGINBEGIN")
logging.debug("headers: %s" % headers)
self.description = "zypp(%s)" % basename(readlink("/proc/%d/exe" % getppid()))
self.userdata = self.get_userdata(headers)
self.ack()
def COMMITBEGIN(self, headers, body):
logging.info("COMMITBEGIN")
solvables = self.get_solvables(body, True)
logging.debug("solvables: %s" % solvables)
found, important = self.match_solvables(solvables)
logging.info("found: %s, important: %s" % (found, important))
if found or important:
self.userdata["important"] = "yes" if important else "no"
try:
logging.info("creating pre snapshot")
self.num1 = snapper.CreatePreSnapshot("root", self.description, self.cleanup,
self.userdata)
logging.debug("created pre snapshot %d" % self.num1)
except DBusException as e:
logging.error("creating snapshot failed:")
logging.error(" %s", e)
self.ack()
def COMMITEND(self, headers, body):
logging.info("COMMITEND")
if self.num1:
solvables = self.get_solvables(body, False)
logging.debug("solvables: %s" % solvables)
found, important = self.match_solvables(solvables)
logging.info("found: %s, important: %s" % (found, important))
if found or important:
self.userdata["important"] = "yes" if important else "no"
try:
snapper.SetSnapshot("root", self.num1, self.description, self.cleanup,
self.userdata)
except DBusException as e:
logging.error("setting snapshot data failed:")
logging.error(" %s", e)
try:
logging.info("creating post snapshot")
self.num2 = snapper.CreatePostSnapshot("root", self.num1, "", self.cleanup,
self.userdata)
logging.debug("created post snapshot %d" % self.num2)
except DBusException as e:
logging.error("creating snapshot failed:")
logging.error(" %s", e)
else:
try:
logging.info("deleting pre snapshot")
snapper.DeleteSnapshots("root", [ self.num1 ])
logging.debug("deleted pre snapshot %d" % self.num1)
except DBusException as e:
logging.error("deleting snapshot failed:")
logging.error(" %s", e)
self.ack()
def PLUGINEND(self, headers, body):
logging.info("PLUGINEND")
self.ack()
config = Config()
try:
bus = SystemBus()
snapper = Interface(bus.get_object('org.opensuse.Snapper', '/org/opensuse/Snapper'),
dbus_interface='org.opensuse.Snapper')
except DBusException as e:
logging.error("connect to snapperd failed:")
logging.error(" %s", e)
sys.exit(1)
plugin = MyPlugin()
plugin.main()
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