def backup(min_interval=MIN_INTERVAL, backup_dir=BACKUP_DIR, data_dir=DATA_DIR):
if backup_dir is None:
return
#XXX: The timeout is arbitary but dependant on the back-up, should we start
# with a sane default and then refer to how long the last back-up
# took?
backup_lock = join_path(DATA_DIR, '.backup.lock')
with file_lock(backup_lock, pid_policy=PID_WARN, timeout=60):
_backup(min_interval, backup_dir, data_dir)
def backup(min_interval=MIN_INTERVAL,
backup_dir=BACKUP_DIR,
data_dir=DATA_DIR):
if backup_dir is None:
return
#XXX: The timeout is arbitrary but dependent on the back-up, should we start
# with a sane default and then refer to how long the last back-up
# took?
backup_lock = join_path(DATA_DIR, '.backup.lock')
with file_lock(backup_lock, pid_policy=PID_WARN, timeout=60):
_backup(min_interval, backup_dir, data_dir)
def __exit__(self, type, value, traceback):
#self._file_input.close()
if not self._read_only:
assert len(self._input_files) == 1, 'more than one valid outfile'
# We are hitting the disk a lot more than we should here, what we
# should have is a modification flag in the object but we can't
# due to how we change the annotations.
out_str = unicode(self)
with open_textfile(self._input_files[0], 'r') as old_ann_file:
old_str = old_ann_file.read()
# Was it changed?
if out_str == old_str:
# Then just return
return
from config import WORK_DIR
# Protect the write so we don't corrupt the file
with file_lock(path_join(WORK_DIR,
basename(self._input_files[0].replace('/', '_')))
) as lock_file:
#from tempfile import NamedTemporaryFile
from tempfile import mkstemp
# TODO: XXX: Is copyfile really atomic?
from shutil import copyfile
# XXX: NamedTemporaryFile only supports encoding for Python 3
# so we hack around it.
#with NamedTemporaryFile('w', suffix='.ann') as tmp_file:
# Grab the filename, but discard the handle
_, tmp_fname = mkstemp(suffix='.ann')
try:
with open_textfile(tmp_fname, 'w') as tmp_file:
#XXX: Temporary hack to make sure we don't write corrupted
# files, but the client will already have the version
# at this stage leading to potential problems upon
# the next change to the file.
tmp_file.write(out_str)
tmp_file.flush()
try:
with Annotations(tmp_file.name) as ann:
# Move the temporary file onto the old file
copyfile(tmp_file.name, self._input_files[0])
# As a matter of convention we adjust the modified
# time of the data dir when we write to it. This
# helps us to make back-ups
now = time()
#XXX: Disabled for now!
#utime(DATA_DIR, (now, now))
except Exception, e:
from message import Messager
Messager.error('ERROR writing changes: generated annotations cannot be read back in!\n(This is almost certainly a system error, please contact the developers.)\n%s' % e, -1)
raise
finally:
try:
from os import remove
remove(tmp_fname)
except Exception, e:
from message import Messager
Messager.error("Error removing temporary file '%s'" % tmp_fname)
return
