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from commands import getstatusoutput
import os
import shutil
import stat
import string
import sys
import zope.interface
import workspacecontrol.api.modules
from workspacecontrol.api.exceptions import *
from workspacecontrol.main import ACTIONS
import workspacecontrol.main.wc_args as wc_args
from propagate_adapter import PropagationAdapter
# keywords for 'adapters' dict as well as the expected URL schemes
PROP_ADAPTER_SCP = "scp"
PROP_ADAPTER_GUC = "gsiftp"
PROP_ADAPTER_HDFS = "hdfs"
PROP_ADAPTER_HTTP = "http"
PROP_ADAPTER_LANTORRENT = "lantorrent"
class DefaultImageProcurement:
"""ImageProcurement is the wcmodule responsible for making files accessible
to the current VMM node before the deployment. As well as processing files
after deployment. The typical pattern is propagation before running and
unpropagation afterwards. If there is an immediate-destroy event, this
module will destroy all local files.
That is what we assume most implementations would do, they don't necessarily
have to. Perhaps in some future implementation, this module will archive
destroyed VMs to some storage array for auditing.
"""
zope.interface.implements(workspacecontrol.api.modules.IImageProcurement)
def __init__(self, params, common):
self.p = params
self.c = common
self.localdir = None
self.securelocaldir = None
self.adapters = None # dict: {keyword: instance of PropagationAdapter}
# --------------------------------------------------------------------------
# validate(), from ImageProcurement interface
# --------------------------------------------------------------------------
def validate(self):
self._validate_localdir()
self._validate_securelocaldir()
self.blankcreate_path = None
self._validate_blankspacecreate()
self.adapters = {}
scp_path = self.p.get_conf_or_none("propagation", "scp")
if scp_path:
try:
import propagate_scp
self.adapters[PROP_ADAPTER_SCP] = propagate_scp.propadapter(self.p, self.c)
except:
msg = "SCP configuration present (propagation->scp) but cannot load a suitable SCP implementation in the code"
self.c.log.exception(msg + ": ")
raise InvalidConfig(msg)
guc_path = self.p.get_conf_or_none("propagation", "guc")
if guc_path:
try:
import propagate_guc
self.adapters[PROP_ADAPTER_GUC] = propagate_guc.propadapter(self.p, self.c)
except:
msg = "GridFTP configuration present (propagation->guc) but cannot load a suitable GridFTP implementation in the code"
self.c.log.exception(msg + ": ")
raise InvalidConfig(msg)
hdfs_path = self.p.get_conf_or_none("propagation", "hdfs")
if hdfs_path:
try:
import propagate_hdfs
self.adapters[PROP_ADAPTER_HDFS] = propagate_hdfs.propadapter(self.p, self.c)
except:
msg = "HDFS configuration present (propagation->hdfs) but cannot load a suitable HDFS implementation in the code"
self.c.log.exception(msg + ": ")
raise InvalidConfig(msg)
http_enabled = self.p.get_conf_or_none("propagation", "http")
if http_enabled and http_enabled.strip().lower() == "true":
import propagate_http
self.adapters[PROP_ADAPTER_HTTP] = propagate_http.propadapter(self.p, self.c)
if len(self.adapters) == 0:
self.c.log.warn("There are no propagation adapters configured, propagation is disabled")
return
lt_enabled = self.p.get_conf_or_none("propagation", "lantorrent")
if lt_enabled and lt_enabled.strip().lower() == "true":
try:
import propagate_lantorrent
self.adapters[PROP_ADAPTER_LANTORRENT] = propagate_lantorrent.LantorrentPropadapter(self.p, self.c)
except Exception, ex:
msg = "lantorrent configuration present (propagation->lantorrent) but cannot load a suitable lantorrent implementation in the code: " + str(ex)
self.c.log.exception(msg + ": ")
raise InvalidConfig(msg)
for keyword in self.adapters.keys():
adapter = self.adapters[keyword]
adapter.validate()
# --------------------------------------------------------------------------
# validate() IMPL
# --------------------------------------------------------------------------
def _validate_localdir(self):
localdir = self.p.get_conf_or_none("images", "localdir")
if not localdir:
raise InvalidConfig("no images->localdir configuration")
if not os.path.isabs(localdir):
localdir = self.c.resolve_var_dir(localdir)
if not os.path.isdir(localdir):
raise InvalidConfig("localdir is not a directory: %s" % localdir)
self.localdir = localdir
self.c.log.debug("local image directory (localdir): %s" % self.localdir)
def _validate_securelocaldir(self):
securelocaldir = self.p.get_conf_or_none("images", "securelocaldir")
if not securelocaldir:
raise InvalidConfig("no images->securelocaldir configuration")
if not os.path.isabs(securelocaldir):
securelocaldir = self.c.resolve_var_dir(securelocaldir)
if not os.path.exists(securelocaldir):
self.c.log.warn("securelocaldir is configured, but '%s' does not"
" exist on the filesystem, attemping to create "
" it" % securelocaldir)
try:
os.mkdir(securelocaldir)
os.chmod(securelocaldir, stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR)
except:
exception_type = sys.exc_type
try:
exceptname = exception_type.__name__
except AttributeError:
exceptname = exception_type
raise InvalidConfig("Problem creating securelocaldir: %s: %s"
% (str(exceptname), str(sys.exc_value)))
self.c.log.warn("created secure localdir '%s'" % securelocaldir)
x = os.access(securelocaldir, os.W_OK | os.X_OK | os.R_OK)
if x:
self.c.log.debug("'%s' exists on the filesystem and is "
"rwx-able" % securelocaldir)
else:
raise InvalidConfig("'%s' exists on the filesystem but is not rwx"
% securelocaldir)
self.securelocaldir = securelocaldir
self.c.log.debug("secure image directory (per-instance images): %s" % self.securelocaldir)
def _validate_blankspacecreate(self):
blankcreate_path = self.p.get_conf_or_none("images", "blankcreate")
if not blankcreate_path:
self.c.log.warn("No images->blankcreate configuration, blankspace creation is disabled")
return
if not os.path.isabs(blankcreate_path):
blankcreate_path = self.c.resolve_libexec_dir(blankcreate_path)
if not os.access(blankcreate_path, os.X_OK):
raise InvalidConfig("images->blankcreate configuration '%s' is not executable" % blankcreate_path)
self.blankcreate_path = blankcreate_path
# --------------------------------------------------------------------------
# lengthy_obtain(), from ImageProcurement interface
# --------------------------------------------------------------------------
def lengthy_obtain(self):
"""Given a set of deployment parameters, return True if it is determined
that the 'obtain' operation should be called in a daemonized mode with
an asynchronous 'propagated' message being sent afterwards.
"""
l_files = self._process_image_args()
return self._is_propagation_needed(l_files)
# --------------------------------------------------------------------------
# lengthy_shutdown(), from ImageProcurement interface
# --------------------------------------------------------------------------
def lengthy_shutdown(self):
"""Given a set of parameters, return True if it is determined that the
'process_after_shutdown' operation should be called in a daemonized mode
with an asynchronous 'unpropagated' message being sent afterwards.
"""
l_files = self._process_image_args(unprop=True)
return self._is_unpropagation_needed(l_files)
# --------------------------------------------------------------------------
# obtain(), from ImageProcurement interface
# --------------------------------------------------------------------------
def obtain(self):
"""Given a set of deployment parameters, bring this VMM node into a
state where it can operate on a set of local files.
Return an instance of LocalFileSet
"""
action = self.p.get_arg_or_none(wc_args.ACTION)
if action in [ACTIONS.CREATE, ACTIONS.PROPAGATE]:
self._ensure_instance_dir()
l_files = self._process_image_args()
if self._is_propagation_needed(l_files):
self._propagate(l_files)
elif action in [ACTIONS.PRINTXML]:
l_files = self._process_image_args()
elif action in [ACTIONS.UNPROPAGATE]:
self._ensure_instance_dir()
l_files = self._process_image_args(unprop=True)
# client requesting new names
unproptargets_arg = self.p.get_arg_or_none(wc_args.UNPROPTARGETS)
if unproptargets_arg:
self._process_new_unproptargets(l_files, unproptargets_arg)
elif action in [ACTIONS.REMOVE]:
l_files = []
else:
raise ProgrammingError("do not know how to handle obtain request for action '%s'" % action)
if action == ACTIONS.CREATE:
if self._is_blankspace_needed(l_files):
self._blankspace(l_files)
local_file_set_cls = self.c.get_class_by_keyword("LocalFileSet")
local_file_set = local_file_set_cls(l_files)
return local_file_set
# --------------------------------------------------------------------------
# process_after_shutdown(), from ImageProcurement interface
# --------------------------------------------------------------------------
def process_after_shutdown(self, local_file_set):
"""Do any necessary work after a VM shuts down and is being prepared
for teardown. Will not be called if there is an immediate-destroy
event because that needs no unpropagation.
local_file_set -- instance of LocalFileSet
Return nothing, local_file_set will be modified as necessary.
"""
l_files = local_file_set.flist()
if self._is_unpropagation_needed(l_files):
self._unpropagate(l_files)
self._destroy_instance_dir()
# --------------------------------------------------------------------------
# process_after_destroy(), from ImageProcurement interface
# --------------------------------------------------------------------------
def process_after_destroy(self, local_file_set):
"""Do any necessary work after a VM is forcibly shut down. This is the
alternative teardown hook to "process_after_shutdown()" and is called if
there is an immediate-destroy event vs. a shutdown + unpropagate
pattern.
local_file_set -- instance of LocalFileSet
Return nothing, local_file_set will be modified as necessary.
"""
self._destroy_instance_dir()
# --------------------------------------------------------------------------
# IMPLs for common query functionality
# --------------------------------------------------------------------------
def _is_propagation_needed(self, l_files):
propneeded = 0
for lf in l_files:
if lf._propagate_needed:
propneeded += 1
if self.c.trace:
self.c.log.debug("%d propagation tasks" % propneeded)
return propneeded > 0
def _is_blankspace_needed(self, l_files):
blankneeded = 0
for lf in l_files:
if lf._blankspace > 0:
blankneeded += 1
if self.c.trace:
self.c.log.debug("%d blankspace tasks" % blankneeded)
return blankneeded > 0
def _is_unpropagation_needed(self, l_files):
unpropneeded = 0
for lf in l_files:
if lf._unpropagate_needed:
unpropneeded += 1
if self.c.trace:
self.c.log.debug("%d unpropagation tasks" % unpropneeded)
return unpropneeded > 0
def _derive_instance_dir(self):
vm_name = self.p.get_arg_or_none(wc_args.NAME)
if not vm_name:
raise InvalidInput("The %s argument is required." % wc_args.NAME.long_syntax)
vm_securedir = os.path.join(self.securelocaldir, vm_name)
return vm_securedir
# --------------------------------------------------------------------------
# IMPLs for actual actions the module takes
# --------------------------------------------------------------------------
def _ensure_instance_dir(self):
vmdir = self._derive_instance_dir()
if os.path.exists(vmdir):
return
self.c.log.info("Creating VM's unique directory: %s" % vmdir)
os.mkdir(vmdir)
os.chmod(vmdir, stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR)
self.c.log.debug("created %s" % vmdir)
def _destroy_instance_dir(self):
vmdir = self._derive_instance_dir()
if not os.path.exists(vmdir):
return
self.c.log.debug("Destroying %s" % vmdir)
shutil.rmtree(vmdir)
self.c.log.info("Destroyed VM's unique directory: %s" % vmdir)
def _propagate(self, l_files):
for l_file in l_files:
if not l_file._propagate_needed:
continue
for keyword in self.adapters.keys():
schemestring = keyword + "://"
scheme_len = len(schemestring)
target_scheme = l_file._propagation_source[:scheme_len]
if target_scheme == schemestring:
adapter = self.adapters[keyword]
self.c.log.debug("propagating from '%s' to '%s'" % (l_file._propagation_source, l_file.path))
if self.c.dryrun:
self.c.log.debug("dryrun, not propagating")
return
adapter.propagate(l_file._propagation_source, l_file.path)
if not os.path.exists(l_file.path):
raise UnexpectedError("propagated from '%s' to '%s' but the file does not exist" % (l_file._propagation_source, l_file.path))
return
def _unpropagate(self, l_files):
for l_file in l_files:
if not l_file._unpropagate_needed:
continue
for keyword in self.adapters.keys():
schemestring = keyword + "://"
scheme_len = len(schemestring)
target_scheme = l_file._unpropagation_target[:scheme_len]
if target_scheme == schemestring:
adapter = self.adapters[keyword]
self.c.log.debug("unpropagating from '%s' to '%s'" % (l_file.path, l_file._unpropagation_target))
if self.c.dryrun:
self.c.log.debug("dryrun, not unpropagating")
return
adapter.unpropagate(l_file.path, l_file._unpropagation_target)
return
def _blankspace(self, l_files):
for l_file in l_files:
if l_file._blankspace == 0:
continue
cmd = "%s %s %s" % (self.blankcreate_path, l_file.path, l_file._blankspace)
self.c.log.debug("running '%s'" % cmd)
if self.c.dryrun:
self.c.log.debug("(dryrun, not running that)")
return
try:
ret,output = getstatusoutput(cmd)
except:
raise
if ret:
errmsg = "problem running command: '%s' ::: return code" % cmd
errmsg += ": %d ::: output:\n%s" % (ret, output)
raise EnvironmentProblem(errmsg)
else:
self.c.log.info("blank partition of size %dMB created at '%s'" % (l_file._blankspace, l_file.path))
# --------------------------------------------------------------------------
# _process_image_args(), IMPL of common validation/preparation functionality
# --------------------------------------------------------------------------
def _process_image_args(self, unprop=False):
"""Return list of files to process. Validate in the process.
"""
action = self.p.get_arg_or_none(wc_args.ACTION)
if not action:
raise InvalidInput("No action, cannot process images argument")
images = self.p.get_arg_or_none(wc_args.IMAGES)
if not images:
raise InvalidInput("The %s action requires the %s argument" % (action, wc_args.IMAGES.long_syntax))
# ---------------------------------------------------------------
# Parse images string to group of images
# The given input string might be quoted to escape semicolons for
# certain delivery methods (e.g., sh over ssh) and some methods may
# not strip quotes (e.g., localhost, direct exe invocation).
# So strip extra quotes if present, but don't expect quotes.
if images[0] == "'":
images = images[1:]
# (there is a pathological case where input was only a single quote)
if images and images[-1] == "'":
images = images[:-1]
imgstrs = images.split(';;')
i = 0
l_files = []
for imgstr in imgstrs:
i += 1
logstr = "image #%d" % i
lf = self._one_imagestr(logstr, imgstr, unprop)
self.c.log.debug("%s is valid" % logstr)
# convention in the past is that first is rootdisk, a new arg
# scheme might come about but for now we must match the old
# workspace-control syntax
if i == 1:
lf.rootdisk = True
l_files.append(lf)
self.c.log.debug("found %d valid partitions/HD images" % len(l_files))
if action != ACTIONS.CREATE and action != ACTIONS.PRINTXML:
# only creation requires mountpoints which is checked below
return l_files
# ---------------------------------------------------------------
imagemounts = self.p.get_arg_or_none(wc_args.IMAGEMOUNTS)
if not imagemounts:
raise InvalidInput("The %s action requires the %s argument" % (action, wc_args.IMAGEMOUNTS.long_syntax))
self.c.log.debug("analyzing mountpoints '%s'" % imagemounts)
# Parse imagemounts string to group of mountpoints
# The given input string might be quoted to escape semicolons for
# certain delivery methods (e.g., sh over ssh) and some methods may
# not strip quotes (e.g., localhost, direct exe invocation).
# So strip extra quotes if present, but don't expect quotes.
if imagemounts[0] == "'":
imagemounts = imagemounts[1:]
# (there is a pathological case where input was only a single quote)
if imagemounts and imagemounts[-1] == "'":
imagemounts = imagemounts[:-1]
imagemountlist = []
mountstrs = imagemounts.split(';;')
for mountstr in mountstrs:
if mountstr[:5] == "/dev/":
prev = mountstr
mountstr = mountstr[5:]
self.c.log.debug("stripped '/dev' from '%s', now = '%s'" % (prev, mountstr))
imagemountlist.append(mountstr)
if len(imagemountlist) < 1:
raise InvalidInput("The %s action requires a valid %s argument, received '%s'" % (action, wc_args.IMAGEMOUNTS.long_syntax, imagemounts))
nummts = len(imagemountlist)
numparts = len(l_files)
if nummts != numparts:
raise InvalidInput("fatal, number of mountpoints (%d) does not match number of valid partitions/HD images (%d)" % (nummts, numparts))
for i,l_file in enumerate(l_files):
l_file.mountpoint = imagemountlist[i]
return l_files
# --------------------------------------------------------------------------
# _one_imagestr() supports _process_image_args() above
# --------------------------------------------------------------------------
def _one_imagestr(self, logstr, imgstr, unprop=False):
"""Convert given imagestr from arguments into LocalFile list.
"""
lf_cls = self.c.get_class_by_keyword("LocalFile")
lf = lf_cls()
# Introduce 'hidden' fields into the LocalFile instance for use by
# this module only.
lf._blankspace = 0
lf._propagate_needed = False
lf._propagation_source = None
lf._unpropagate_needed = False
lf._unpropagation_target = None
# These are the fields the LocalFile interface expects:
lf.path = None
lf.mountpoint = None # not set in this method
lf.rootdisk = False # not set in this method
lf.editable = True
lf.read_write = True
lf.physical = False
# if 'ro' is not a field, assumed to be 'rw'
parts = imgstr.split(';')
if len(parts) > 1:
if parts[1] == 'ro':
lf.read_write = False
imgstr = parts[0]
self.c.log.debug("Examining file (partition/HD image): '%s'" % imgstr)
# ---------------------------------------------------------------
if ".." in imgstr:
raise InvalidInput("'%s' contains '..', that is not allowed" % imgstr)
# ---------------------------------------------------------------
prop = not unprop # peering suspiciously
if prop and imgstr[0] == "/":
lf.path = imgstr
self.c.log.debug("partition/HD is absolute path")
if self.securelocaldir in lf.path:
raise InvalidInput("Attempt to specify absolute path ('%s') that lies in secure image directory. This is not allowed because that secure image directory is managed by workspace control, it is for per-instance files that the program retrieves." % lf.path)
if not os.path.exists(lf.path):
raise InvalidInput("File specified by absolute path ('%s') but it does not exist." % lf.path)
# ---------------------------------------------------------------
elif prop and imgstr[:8] == "file:///":
lf.path = imgstr[8:]
self.c.log.debug("partition/HD is absolute path w/ file://")
if self.securelocaldir in lf.path:
raise InvalidInput("Attempt to specify absolute path ('%s') that lies in secure image directory. This is not allowed because that secure image directory is managed by workspace control, it is for per-instance files that the program retrieves." % lf.path)
if not os.path.exists(lf.path):
raise InvalidInput("File specified by absolute path ('%s') but it does not exist." % lf.path)
# ---------------------------------------------------------------
elif prop and imgstr[:7] == "file://":
original = imgstr[7:]
self.c.log.debug("partition/HD is relative path w/ file://")
securedir_try = self._derive_instance_dir()
securedir_try = os.path.join(securedir_try, original)
localdir_try = os.path.join(self.localdir, original)
# important: try securedir first, it takes precedence
if os.path.exists(securedir_try):
localdir_try = None
elif os.path.exists(localdir_try):
securedir_try = None
else:
raise InvalidInput("File specified by relative path ('%s' could resolve to either '%s' or '%s') but it does not exist" % (original, securedir_try, localdir_try))
if securedir_try:
lf.path = securedir_try
elif localdir_try:
lf.path = localdir_try
else:
raise ProgrammingError("must be relative to either securedir or localdir or it is invalid")
# ---------------------------------------------------------------
elif imgstr[:14] == "blankcreate://":
self._one_imagestr_blankcreate(lf, imgstr)
# ---------------------------------------------------------------
else:
self._one_imagestr_propagation(lf, imgstr, unprop)
# ---------------------------------------------------------------
if prop and not lf.path:
raise InvalidInput("image specified is not an absolute path and uses an unknown URL scheme, or perhaps no scheme at all: '%s'" % imgstr)
if unprop and not lf._unpropagate_needed:
raise InvalidInput("Received images argument for an unpropagation request that makes no sense: %s" % imgstr)
if not lf.path:
raise InvalidInput("image specified is not an absolute path and uses an unknown URL scheme, or perhaps no scheme at all: '%s'" % imgstr)
return lf
# --------------------------------------------------------------------------
# support methods for _one_imagestr()
# --------------------------------------------------------------------------
def _one_imagestr_blankcreate(self, lf, imgstr):
if not self.blankcreate_path:
raise InvalidInput("blankspace creation requested ('%s') but that functionality is not enabled" % imgstr)
blank_filename = imgstr[14:]
if len(blank_filename) > 0:
if blank_filename[0] == "/":
raise InvalidInput("blank partition creation can only happen in secure workspace-specific local directory (absolute path used: '%s')" % blank_filename)
else:
raise InvalidInput("blank partition has no name ('%s' given)" % imgstr)
try:
size = blank_filename.split("-size-")[1]
lf._blankspace = int(size)
except:
raise InvalidInput("blank partition name is expected to have embedded size")
lf.path = self._derive_instance_dir()
lf.path = os.path.join(lf.path, blank_filename)
if os.path.exists(lf.path):
raise InvalidInput("blank partition is going to be created but the file exists already: '%s'" % lf.path)
if self.c.trace:
self.c.log.debug("partition of size %dM is going to be created (blankcreate) at '%s'" % (lf._blankspace, lf.path))
def _one_imagestr_propagation(self, lf, imgstr, unprop):
for keyword in self.adapters.keys():
schemestring = keyword + "://"
schemestring_len = len(schemestring)
self.c.log.debug("schemestring: %s" % schemestring)
# note: relative paths for local files require "file://"
if len(imgstr) <= schemestring_len:
raise InvalidInput("image specified is not an absolute path and uses an unknown URL scheme, or perhaps no scheme at all: %s" % imgstr)
if imgstr[:schemestring_len] == schemestring:
self.c.log.debug("partition/HD is specified w/ %s" % schemestring)
adapter = self.adapters[keyword]
if unprop:
adapter.validate_unpropagate_target(imgstr)
else:
adapter.validate_propagate_source(imgstr)
if unprop:
lf._unpropagate_needed = True
lf._unpropagation_target = imgstr
else:
lf._propagate_needed = True
lf._propagation_source = imgstr
fnameindex = string.rfind(imgstr, '/')
local_filename = imgstr[fnameindex+1:]
# lf.path is propagation target while in the module ... if this
# object is returned by the module, it is assumed to exist
lf.path = self._derive_instance_dir()
lf.path = os.path.join(lf.path, local_filename)
pathexists = os.path.exists(lf.path)
if pathexists and lf._propagate_needed:
raise InvalidInput("file is going to be transferred to this host but the target exists already: '%s'" % lf.path)
# You would think you can make the following commented-out check
# here, but you can't. Things that are leaving the host can't
# be checked for ahead of time before the transfer because
# filenames can be changed (consider *.gz).
###if not pathexists and lf._unpropagate_needed:
### raise InvalidInput("file is going to be transferred from
###this host but it does not exist: '%s'" % lf.path)
return
def _process_new_unproptargets(self, l_files, unproptargets_arg):
# The given input string might be quoted to escape semicolons for
# certain delivery methods (e.g., sh over ssh) and some methods may
# not strip quotes (e.g., localhost, direct exe invocation).
# So strip extra quotes if present, but don't expect quotes.
if unproptargets_arg[0] == "'":
unproptargets_arg = unproptargets_arg[1:]
# (there is a pathological case where input was only a single quote)
if unproptargets_arg and unproptargets_arg[-1] == "'":
unproptargets_arg = unproptargets_arg[:-1]
unproptargets = unproptargets_arg.split(';;')
argname = wc_args.UNPROPTARGETS.long_syntax
if len(unproptargets) == 0:
raise InvalidInput("received %s argument but there are no targets" % argname)
num_needs = 0
for lf in l_files:
if lf._unpropagate_needed:
num_needs += 1
if num_needs == 0:
raise InvalidInput("received %s argument but there are no unpropagations scheduled" % argname)
if len(unproptargets) != num_needs:
raise InvalidInput("received %s argument but cannot match unpropagations scheduled with targets. There are %d unprop-targets and %d unpropagation needs" % (argname, len(unproptargets), num_needs))
# note how the order is assumed to match -- this is a precarious side
# effect of the commandline based syntax
counter = -1
for lf in l_files:
if lf._unpropagate_needed:
counter += 1
old = lf._unpropagation_target
lf._unpropagation_target = unproptargets[counter]
self.c.log.debug("old unpropagation target '%s' is now '%s'" % (old, lf._unpropagation_target))
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