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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.Options
import Bcfg2.Server.Plugin
try:
import pysvn
HAS_SVN = True
except ImportError:
from Bcfg2.Utils import Executor
HAS_SVN = False
class Svn(Bcfg2.Server.Plugin.Version):
"""Svn is a version plugin for dealing with Bcfg2 repos."""
options = Bcfg2.Server.Plugin.Version.options + [
Bcfg2.Options.Option(
cf=("svn", "conflict_resolution"), dest="svn_conflict_resolution",
type=lambda v: v.replace("-", "_"),
choices=dir(pysvn.wc_conflict_choice),
default=pysvn.wc_conflict_choice.postpone,
help="SVN conflict resolution method"),
Bcfg2.Options.Option(
cf=("svn", "user"), dest="svn_user", help="SVN username"),
Bcfg2.Options.Option(
cf=("svn", "password"), dest="svn_password", help="SVN password"),
Bcfg2.Options.BooleanOption(
cf=("svn", "always_trust"), dest="svn_trust_ssl",
help="Always trust SSL certs from SVN server")]
__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):
Bcfg2.Server.Plugin.Version.__init__(self, core)
self.revision = None
self.svn_root = None
self.client = None
self.cmd = None
if not HAS_SVN:
self.logger.debug("Svn: PySvn not found, using CLI interface to "
"SVN")
self.cmd = Executor()
else:
self.client = pysvn.Client()
self.debug_log("Svn: Conflicts will be resolved with %s" %
Bcfg2.Options.setup.svn_conflict_resolution)
self.client.callback_conflict_resolver = self.conflict_resolver
if Bcfg2.Options.setup.svn_trust_ssl:
self.client.callback_ssl_server_trust_prompt = \
self.ssl_server_trust_prompt
if (Bcfg2.Options.setup.svn_user and
Bcfg2.Options.setup.svn_password):
self.client.callback_get_login = self.get_login
self.logger.debug("Svn: Initialized svn plugin with SVN directory %s" %
self.vcs_path)
def get_login(self, realm, username, may_save): # pylint: disable=W0613
""" PySvn callback to get credentials for HTTP basic authentication """
self.logger.debug("Svn: Logging in with username: %s" %
Bcfg2.Options.setup.svn_user)
return (True,
Bcfg2.Options.setup.svn_user,
Bcfg2.Options.setup.svn_password,
False)
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 conflict_resolver(self, conflict_description):
""" PySvn callback function to resolve conflicts """
self.logger.info("Svn: Resolving conflict for %s with %s" %
(conflict_description['path'],
Bcfg2.Options.setup.svn_conflict_resolution))
return Bcfg2.Options.setup.svn_conflict_resolution, None, False
def get_revision(self):
"""Read svn revision information for the Bcfg2 repository."""
msg = None
if HAS_SVN:
try:
info = self.client.info(Bcfg2.Options.setup.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:
result = self.cmd.run(["env LC_ALL=C", "svn", "info",
Bcfg2.Options.setup.vcs_root],
shell=True)
if result.success:
self.revision = [line.split(': ')[1]
for line in result.stdout.splitlines()
if line.startswith('Revision:')][-1]
return self.revision
else:
msg = "Failed to read svn info: %s" % result.error
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(Bcfg2.Options.setup.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" %
(Bcfg2.Options.setup.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([Bcfg2.Options.setup.vcs_root],
'Svn: autocommit',
recurse=True)
self.revision = self.client.update(Bcfg2.Options.setup.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
|
