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"""All POSIX Type client support for Bcfg2."""
import os
import re
import sys
import shutil
import Bcfg2.Options
import Bcfg2.Client.Tools
from datetime import datetime
from Bcfg2.Compat import walk_packages
from Bcfg2.Client.Tools.POSIX.base import POSIXTool
class POSIX(Bcfg2.Client.Tools.Tool):
"""POSIX File support code."""
options = Bcfg2.Client.Tools.Tool.options + POSIXTool.options + [
Bcfg2.Options.PathOption(
cf=('paranoid', 'path'), default='/var/cache/bcfg2',
dest='paranoid_path',
help='Specify path for paranoid file backups'),
Bcfg2.Options.Option(
cf=('paranoid', 'max_copies'), default=1, type=int,
dest='paranoid_copies',
help='Specify the number of paranoid copies you want'),
Bcfg2.Options.BooleanOption(
'-P', '--paranoid', cf=('client', 'paranoid'),
help='Make automatic backups of config files')]
def __init__(self, config):
Bcfg2.Client.Tools.Tool.__init__(self, config)
self._handlers = self._load_handlers()
self.logger.debug("POSIX: Handlers loaded: %s" %
(", ".join(list(self._handlers.keys()))))
self.__req__ = dict(Path=dict())
for etype, hdlr in list(self._handlers.items()):
self.__req__['Path'][etype] = hdlr.__req__
self.__handles__.append(('Path', etype))
# Tool.__init__() sets up the list of handled entries, but we
# need to do it again after __handles__ has been populated. we
# can't populate __handles__ when the class is created because
# _load_handlers() _must_ be called at run-time, not at
# compile-time. This also has to _extend_ self.handled, not
# set it, because self.handled has some really crazy
# semi-global thing going that, frankly, scares the crap out
# of me.
for struct in config:
self.handled.extend([e for e in struct
if (e not in self.handled and
self.handlesEntry(e))])
def _load_handlers(self):
""" load available POSIX tool handlers. this must be called
at run-time, not at compile-time, or we get wierd circular
import issues. """
rv = dict()
for submodule in walk_packages(path=__path__, prefix=__name__ + "."):
mname = submodule[1].rsplit('.', 1)[-1]
if mname == 'base':
continue
try:
module = getattr(__import__(submodule[1]).Client.Tools.POSIX,
mname)
except ImportError:
continue
hdlr = getattr(module, "POSIX" + mname)
if POSIXTool in hdlr.__mro__:
# figure out what entry type this handler handles
etype = hdlr.__name__[5:].lower()
rv[etype] = hdlr(self.config)
return rv
def canVerify(self, entry):
if not Bcfg2.Client.Tools.Tool.canVerify(self, entry):
return False
if not self._handlers[entry.get("type")].fully_specified(entry):
self.logger.error('POSIX: Cannot verify incomplete entry %s. '
'Try running bcfg2-lint.' %
entry.get('name'))
return False
return True
def canInstall(self, entry):
"""Check if entry is complete for installation."""
if not Bcfg2.Client.Tools.Tool.canInstall(self, entry):
return False
if not self._handlers[entry.get("type")].fully_specified(entry):
self.logger.error('POSIX: Cannot install incomplete entry %s. '
'Try running bcfg2-lint.' %
entry.get('name'))
return False
return True
def InstallPath(self, entry):
"""Dispatch install to the proper method according to type"""
self.logger.debug("POSIX: Installing entry %s:%s:%s" %
(entry.tag, entry.get("type"), entry.get("name")))
self._paranoid_backup(entry)
return self._handlers[entry.get("type")].install(entry)
def VerifyPath(self, entry, modlist):
"""Dispatch verify to the proper method according to type"""
self.logger.debug("POSIX: Verifying entry %s:%s:%s" %
(entry.tag, entry.get("type"), entry.get("name")))
ret = self._handlers[entry.get("type")].verify(entry, modlist)
if Bcfg2.Options.setup.interactive and not ret:
entry.set('qtext',
'%s\nInstall %s %s: (y/N) ' %
(entry.get('qtext', ''),
entry.get('type'), entry.get('name')))
return ret
def _prune_old_backups(self, entry):
""" Remove old paranoid backup files """
bkupnam = entry.get('name').replace('/', '_')
bkup_re = re.compile(
bkupnam + r'_\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}.\d{6}$')
# current list of backups for this file
try:
bkuplist = [f
for f in os.listdir(Bcfg2.Options.setup.paranoid_path)
if bkup_re.match(f)]
except OSError:
err = sys.exc_info()[1]
self.logger.error("POSIX: Failed to create backup list in %s: %s" %
(Bcfg2.Options.setup.paranoid_path, err))
return
bkuplist.sort()
while len(bkuplist) >= int(Bcfg2.Options.setup.paranoid_copies):
# remove the oldest backup available
oldest = bkuplist.pop(0)
self.logger.info("POSIX: Removing old backup %s" % oldest)
try:
os.remove(os.path.join(Bcfg2.Options.setup.paranoid_path,
oldest))
except OSError:
err = sys.exc_info()[1]
self.logger.error(
"POSIX: Failed to remove old backup %s: %s" %
(os.path.join(Bcfg2.Options.setup.paranoid_path, oldest),
err))
def _paranoid_backup(self, entry):
""" Take a backup of the specified entry for paranoid mode """
if (entry.get("paranoid", 'false').lower() == 'true' and
Bcfg2.Options.setup.paranoid and
entry.get('current_exists', 'true') == 'true' and
not os.path.isdir(entry.get("name"))):
self._prune_old_backups(entry)
bkupnam = "%s_%s" % (entry.get('name').replace('/', '_'),
datetime.isoformat(datetime.now()))
bfile = os.path.join(Bcfg2.Options.setup.paranoid_path, bkupnam)
try:
shutil.copy(entry.get('name'), bfile)
self.logger.info("POSIX: Backup of %s saved to %s" %
(entry.get('name'), bfile))
except IOError:
err = sys.exc_info()[1]
self.logger.error("POSIX: Failed to create backup file for "
"%s: %s" % (entry.get('name'), err))
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