def scan_prev(self, ctx, prev_num):
"""
"""
ctx.total_nodes += 1
if prev_num is None:
cndb = self.backup.get_completed_nodes_db()
path_digest = Digest.dataDigest(self.path().encode('utf8'))
if cndb.has_key(path_digest):
prev_data_is = StringIO.StringIO(cndb[path_digest])
prev_digest = prev_data_is.read(Digest.dataDigestSize())
prev_level = IntegerEncodings.binary_read_int_varlen(prev_data_is)
prev_type = IntegerEncodings.binary_read_int_varlen(prev_data_is)
#print "prev_stat_data->", base64.b64encode(prev_data_is.read())
prev_stat = unserialize_stats(prev_data_is)
else:
ctx.changed_nodes += 1
return False
else:
prev_type, prev_stat, prev_digest, prev_level = prev_num
changed = False
if prev_type != self.get_type():
logging.info("node type differs in the db")
changed = True
#elif (stat.S_IFMT(self.stats[stat.ST_MODE]) !=
#stat.S_IFMT(prev_stat[stat.ST_MODE])):
#print " Node type differs in the fs"
#changed = True
elif prev_stat is None:
logging.info("Base stat not defined")
changed = True
elif self.stats[stat.ST_INO] != prev_stat[stat.ST_INO]:
logging.info("Inode of %s differs: was %d, now %d" %
(self.path(), prev_stat[stat.ST_INO], self.stats[stat.ST_INO]))
changed = True
elif self.stats[stat.ST_MTIME] != prev_stat[stat.ST_MTIME]:
logging.info("Mtime of %s differs: %d != %d" %
(self.path(), self.stats[stat.ST_MTIME], prev_stat[stat.ST_MTIME]))
changed = True
elif time.time() - self.stats[stat.ST_MTIME] <= 1.0:
# The time from the last change is less than the resolution
# of time() functions
logging.info("File %s too recent %d : %d" %
(self.path(), prev_stat[stat.ST_MTIME], time.time()))
changed = True
else:
#
# OK, the prev node seems to be the same as this one.
# Reuse it.
#
self.stats = prev_stat
self.digest = prev_digest
self.level = prev_level
return True
#print "changed node", self.path()
ctx.changed_nodes += 1
return False
def load_epoch_data(self):
# So far, the cache is too resource-intensive.
# Avoid keeping it persistently.
return
if not self.block_longevity_data.has_key("epoch"):
self.epoch = 0
return
self.epoch = int(self.block_longevity_data["epoch"])
longevity_os = StringIO.StringIO(self.block_longevity_data["data"])
while True:
digest = longevity_os.read(Digest.dataDigestSize())
if len(digest) == 0:
break
longevity = IE.binary_read_int_varlen(longevity_os)
epoch = IE.binary_read_int_varlen(longevity_os)
self.block_longevity[digest] = longevity
self.block_epoch[digest] = epoch
def read_directory_entries(self, file):
while True:
node_type = Format.read_int(file)
if node_type is None:
raise StopIteration
node_name = Format.read_string(file)
node_digest = file.read(Digest.dataDigestSize())
node_level = IntegerEncodings.binary_read_int_varlen(file)
node_stat = unserialize_stats(file)
try:
node_name_decoded = unicode(node_name, 'utf8')
yield (node_type, node_name_decoded, node_stat, node_digest, node_level)
except:
logging.info("Encountered bad file name in " + self.path())
def scan(self, ctx, prev_num, exclusion_processor):
"""Scan the node, considering data in all the previous increments
"""
logging.debug("Scanning directory " + self.path())
self.compute_stats()
ctx.num_visited_dirs_reporter.increment(1)
#
# Process data from previous increments.
#
ctx.total_nodes += 1
# prev data indexed by file, for directory scan
prev_name_data = {}
subdirs = []
#
# Fetch prev information of this node
#
# Find the digest of prev node if it exists
prev_digest = None
if prev_num is not None:
prev_type, prev_stat, prev_digest, prev_level = prev_num
if prev_type != NODE_TYPE_DIR:
prev_digest = None
else:
cndb = self.backup.get_completed_nodes_db()
path_digest = Digest.dataDigest(self.path().encode('utf8'))
if cndb.has_key(path_digest):
prev_data_is = StringIO.StringIO(cndb[path_digest])
prev_digest = prev_data_is.read(Digest.dataDigestSize())
prev_level = IntegerEncodings.binary_read_int_varlen(prev_data_is)
prev_type = IntegerEncodings.binary_read_int_varlen(prev_data_is)
#print "prev_stat_data->", base64.b64encode(prev_data_is.read())
prev_stat = unserialize_stats(prev_data_is)
if prev_type != self.get_type():
logging.debug("Node from cndb is not a directory!")
prev_digest = None
# Load the data of the prev node
if prev_digest is not None:
dir_stream = PackerStream.PackerIStream(self.backup, prev_digest,
prev_level)
for node_type, node_name, node_stat, node_digest, node_level in\
self.read_directory_entries(dir_stream):
if node_type == NODE_TYPE_DIR:
subdirs.append(node_name)
prev_name_data[node_name] = ((node_type, node_stat,
node_digest, node_level))
#
# Scan the directory
#
exclusion_processor.filter_files()
# Initialize scanning data
self.children = []
num_children = len(exclusion_processor.get_included_files() +
exclusion_processor.get_included_dirs())
processed_children = 0.0
# Scan the files in the directory
for name in exclusion_processor.get_included_files():
path = os.path.join(self.path(), name)
file_mode = os.lstat(path)[stat.ST_MODE]
if prev_name_data.has_key(name):
cur_prev = prev_name_data[name]
else:
cur_prev = None
try:
if stat.S_ISLNK(file_mode):
node = Symlink(self.backup, self, name)
node.scan(ctx, cur_prev)
self.children.append(node)
elif stat.S_ISREG(file_mode):
node = File(self.backup, self, name)
node.scan(ctx, cur_prev)
self.children.append(node)
else:
ctx.unrecognized_files_reporter.append(path)
logging.info("Ignoring unrecognized file type " + path)
except OSError:
logging.info("OSError accessing " + path)
ctx.oserror_files_reporter.append(path)
# traceback.print_exc()
except IOError, (errno, strerror):
logging.info("IOError %s accessing '%s' %s" % (errno, strerror, path))
ctx.ioerror_files_reporter.append(path)
# traceback.print_exc()
finally:
def _decode_block_info(encoded):
io = StringIO.StringIO(encoded)
seq_idx = IE.binary_read_int_varlen(io)
container_idx = IE.binary_read_int_varlen(io)
return (seq_idx, container_idx)