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""" The Svn plugin provides a revision interface for Bcfg2 repos using
Subversion. If PySvn libraries are installed, then it exposes two
additional XML-RPC methods for committing data to the repository and
updating the repository. """
import sys
import Bcfg2.Server.Plugin
from Bcfg2.Compat import ConfigParser
try:
import pysvn
HAS_SVN = True
except ImportError:
import pipes
from subprocess import Popen, PIPE
HAS_SVN = False
class Svn(Bcfg2.Server.Plugin.Version):
"""Svn is a version plugin for dealing with Bcfg2 repos."""
__author__ = 'bcfg-dev@mcs.anl.gov'
__vcs_metadata_path__ = ".svn"
if HAS_SVN:
__rmi__ = Bcfg2.Server.Plugin.Version.__rmi__ + ['Update', 'Commit']
else:
__vcs_metadata_path__ = ".svn"
def __init__(self, core, datastore):
Bcfg2.Server.Plugin.Version.__init__(self, core, datastore)
self.revision = None
self.svn_root = None
if not HAS_SVN:
self.logger.debug("Svn: PySvn not found, using CLI interface to "
"SVN")
self.client = None
else:
self.client = pysvn.Client()
# pylint: disable=E1101
choice = pysvn.wc_conflict_choice.postpone
try:
resolution = self.core.setup.cfp.get(
"svn",
"conflict_resolution").replace('-', '_')
if resolution in ["edit", "launch", "working"]:
self.logger.warning("Svn: Conflict resolver %s requires "
"manual intervention, using %s" %
choice)
else:
choice = getattr(pysvn.wc_conflict_choice, resolution)
except AttributeError:
self.logger.warning("Svn: Conflict resolver %s does not "
"exist, using %s" % choice)
except (ConfigParser.NoSectionError, ConfigParser.NoOptionError):
self.logger.info("Svn: No conflict resolution method "
"selected, using %s" % choice)
# pylint: enable=E1101
self.debug_log("Svn: Conflicts will be resolved with %s" %
choice)
self.client.callback_conflict_resolver = \
self.get_conflict_resolver(choice)
try:
if self.core.setup.cfp.get(
"svn",
"always_trust").lower() == "true":
self.client.callback_ssl_server_trust_prompt = \
self.ssl_server_trust_prompt
except (ConfigParser.NoSectionError, ConfigParser.NoOptionError):
self.logger.debug("Svn: Using subversion cache for SSL "
"certificate trust")
try:
if (self.core.setup.cfp.get("svn", "user") and
self.core.setup.cfp.get("svn", "password")):
self.client.callback_get_login = \
self.get_login
except (ConfigParser.NoSectionError, ConfigParser.NoOptionError):
self.logger.info("Svn: Using subversion cache for "
"password-based authetication")
self.logger.debug("Svn: Initialized svn plugin with SVN directory %s" %
self.vcs_path)
# pylint: disable=W0613
def get_login(self, realm, username, may_save):
""" PySvn callback to get credentials for HTTP basic authentication """
self.logger.debug("Svn: Logging in with username: %s" %
self.core.setup.cfp.get("svn", "user"))
return True, \
self.core.setup.cfp.get("svn", "user"), \
self.core.setup.cfp.get("svn", "password"), \
False
# pylint: enable=W0613
def ssl_server_trust_prompt(self, trust_dict):
""" PySvn callback to always trust SSL certificates from SVN server """
self.logger.debug("Svn: Trusting SSL certificate from %s, "
"issued by %s for realm %s" %
(trust_dict['hostname'],
trust_dict['issuer_dname'],
trust_dict['realm']))
return True, trust_dict['failures'], False
def get_conflict_resolver(self, choice):
""" Get a PySvn conflict resolution callback """
def callback(conflict_description):
""" PySvn callback function to resolve conflicts """
self.logger.info("Svn: Resolving conflict for %s with %s" %
(conflict_description['path'], choice))
return choice, None, False
return callback
def get_revision(self):
"""Read svn revision information for the Bcfg2 repository."""
msg = None
if HAS_SVN:
try:
info = self.client.info(self.vcs_root)
self.revision = info.revision
self.svn_root = info.url
return str(self.revision.number)
except pysvn.ClientError: # pylint: disable=E1101
msg = "Svn: Failed to get revision: %s" % sys.exc_info()[1]
else:
try:
data = Popen("env LC_ALL=C svn info %s" %
pipes.quote(self.vcs_root), shell=True,
stdout=PIPE).communicate()[0].split('\n')
return [line.split(': ')[1] for line in data
if line[:9] == 'Revision:'][-1]
except IndexError:
msg = "Failed to read svn info"
self.logger.error('Ran command "svn info %s"' % self.vcs_root)
self.revision = None
raise Bcfg2.Server.Plugin.PluginExecutionError(msg)
def Update(self):
'''Svn.Update() => True|False\nUpdate svn working copy\n'''
try:
old_revision = self.revision.number
self.revision = self.client.update(self.vcs_root, recurse=True)[0]
except pysvn.ClientError: # pylint: disable=E1101
err = sys.exc_info()[1]
# try to be smart about the error we got back
details = None
if "callback_ssl_server_trust_prompt" in str(err):
details = "SVN server certificate is not trusted"
elif "callback_get_login" in str(err):
details = "SVN credentials not cached"
if details is None:
self.logger.error("Svn: Failed to update server repository",
exc_info=1)
else:
self.logger.error("Svn: Failed to update server repository: "
"%s" % details)
return False
if old_revision == self.revision.number:
self.logger.debug("repository is current")
else:
self.logger.info("Updated %s from revision %s to %s" %
(self.vcs_root, old_revision,
self.revision.number))
return True
def Commit(self):
"""Svn.Commit() => True|False\nCommit svn repository\n"""
# First try to update
if not self.Update():
self.logger.error("Failed to update svn repository, refusing to "
"commit changes")
return False
try:
self.revision = self.client.checkin([self.vcs_root],
'Svn: autocommit',
recurse=True)
self.revision = self.client.update(self.vcs_root, recurse=True)[0]
self.logger.info("Svn: Commited changes. At %s" %
self.revision.number)
return True
except pysvn.ClientError: # pylint: disable=E1101
err = sys.exc_info()[1]
# try to be smart about the error we got back
details = None
if "callback_ssl_server_trust_prompt" in str(err):
details = "SVN server certificate is not trusted"
elif "callback_get_login" in str(err):
details = "SVN credentials not cached"
if details is None:
self.logger.error("Svn: Failed to commit changes",
exc_info=1)
else:
self.logger.error("Svn: Failed to commit changes: %s" %
details)
return False
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