def checksum(self):
remote_cmd = (f'{self.cypher_command} {self.rpath} | '
'awk \'{ print $1 }\';')
hex_ = self._ssh(remote_cmd).decode(self.encoding)
log.debug(hex_)
return bytes.fromhex(hex_)
def data(self, generator):
cache = self.cache
if cache is not None:
cmeta = cache.meta
else:
assert self.cache is None
# FIXME do we touch a file, write the meta
# and then write the data?
# do we touch a temporary file, write the meta
# unlink the symlink, and move the temp file in, and then write the data?
# the order that we do this in is very important for robustness to failure
# especially when updating a file ...
# storing history in the symlink cache also an option?
log.debug(f'writing to {self}')
chunk1 = next(generator) # if an error occurs don't open the file
with open(self, 'wb') as f:
f.write(chunk1)
for chunk in generator:
#log.debug(chunk)
f.write(chunk)
if cache is not None: # FIXME cache
if not cache.meta:
cache.meta = cmeta # glories of persisting xattrs :/
# yep sometimes the xattrs get blasted >_<
assert cache.meta
assert self.cache.meta
def _data_setter(self, generator):
""" a data setter that can be used in a chain of generators """
log.debug(f'writing to {self}')
chunk1 = next(generator) # if an error occurs don't open the file
with open(self, 'wb') as f:
f.write(chunk1)
yield chunk1
for chunk in generator:
#log.debug(chunk)
f.write(chunk)
yield chunk
def copy_to(self, target, force=False, copy_cache_meta=False):
""" copy from a the current path object to a target path """
if type(target) != type(self):
target = self.__class__(target)
if not target.exists() and not target.is_symlink() or force:
target.data = self.data
else:
raise exc.PathExistsError(f'{target}')
if copy_cache_meta:
log.debug(f'copying cache meta {self.cache.meta}')
target.cache_init(self.cache.meta)
def update_cache(self, cache=None, fetch=True):
""" Update a cache object using the metadata attached to this remote.
This is different form _cache_setter in that it runs update_meta
by default, handles many more edge cases, and checks for consistency.
_cache_setter is usually invoked internally by a CachePath method that
wants to register itself with a remote as an implementaiton detail. """
if cache is not None and self.cache is not None:
# TODO see if there are any exceptions to this behavior
raise TypeError(
'cannot accept cache kwarg when self.cache not None')
elif cache is None:
cache = self.cache
parent_changed = self._parent_changed(cache)
if self.cache is None:
# HACK test if cache is not None before it may have been reassigned
if cache.name != self.name:
msg = ('Cannot update the name and content of a file at the '
'same time.\nAre you sure you have passed the right '
f'cache object?\n{cache.name} != {self.name}')
raise ValueError(msg)
elif parent_changed:
msg = ('Cannot update the parent and content of a file at the '
'same time.\nAre you sure you have passed the right '
f'cache object?\n{cache.parent.id} != {self.parent_id}')
raise ValueError(msg)
log.debug(f'maybe updating cache for {self.name}')
file_is_different = cache._meta_updater(self.meta, fetch=fetch)
# update the cache first # FIXME this may be out of order ...
# then move to the new name if relevant
# prevents moving partial metadata onto existing files
if cache.name != self.name or parent_changed: # this is localy correct
# the issue is that move is now smarter
# and will detect if a parent path has changed
try:
cache.move(remote=self)
except exc.WhyDidntThisGetMovedBeforeError as e:
# AAAAAAAAAAAAAAAAAAAAAAAAAAAAA
# deal with the sadness that is non-unique filenames
# I am 99.999999999999999% certain that users do not
# expect this behavior ...
log.error(e)
self._on_cache_move_error(e, cache)
return file_is_different
def _update_meta(old, new):
if not old:
return False, new # if there is no file it is both different and not different
if not new:
return False, old
file_is_different = False
kwargs = {k: v for k, v in old.items()}
if old.id != new.id:
kwargs['old_id'] = old.id
for k, vnew in new.items():
vold = kwargs[k]
if vnew is None or hasattr(vnew, '__iter__') and not vnew:
# don't update with None or empty iterables
continue
if vold is not None and vold != vnew:
log.info(f'{old.id} field {k} changed from {vold} -> {vnew}')
if k in ('created', 'updated', 'size', 'checksum', 'file_id'):
file_is_different = True
kwargs[k] = vnew
if file_is_different:
# strip fields missing from new in the case where
# we aren't merging metadata from two different sources
for k, vnew in new.items():
if k == 'old_id':
continue
if vnew is None:
log.debug(kwargs.pop(k))
#old.updated == new.updated
#old.updated < new.updated
#old.updated > new.updated
#old.created == new.created
#old.created < new.created
#old.created > new.created
return file_is_different, PathMeta(**kwargs)
def inner(child):
if child.is_dir() and isd:
if child.name == self.name:
self.meta = child.meta
return
elif child.is_file() and isf:
log.debug(f'{child.name} {child.stem}, {child.suffix!r}')
log.debug(f'{self.name} {self.stem}, {self.suffix!r}')
if child.name == self.name:
self.meta = child.meta
elif child.name == self.stem:
candidates.append(child)
elif child.stem == self.name:
candidates.append(child)
elif child.stem == self.stem:
# worst cases
candidates.append(child)
else:
#log.critical('file type mismatch')
pass
def setxattr(self, key, value, namespace=XATTR_DEFAULT_NS):
if not isinstance(value, bytes): # checksums
raise TypeError(f'setxattr only accepts values already encoded to bytes!\n{value!r}')
else:
bytes_value = value
if isinstance(key, bytes):
key = key.decode()
name = self._key_convention(key, namespace)
stream = self._stream(name)
log.debug(name)
log.debug(stream)
log.debug(bytes_value)
with open(stream, 'wb') as f:
f.write(bytes_value)
def _bootstrap_recursive(self, only=tuple(), skip=tuple(), sparse=False):
# TODO if rchildren looks like it could be bad
# go back up to dataset level?
#sname = lambda gen: sorted(gen, key=lambda c: c.name) # c.name doesn't work for remotes
#rcs = sname(self.remote._rchildren(create_cache=False, sparse=sparse))
rcs = self.remote._rchildren(create_cache=False, sparse=sparse)
local_paths = list(self.local.rchildren)
local_files = set(p for p in local_paths
if p.is_file() or p.is_broken_symlink())
file_index = {f.cache_id: f
for f in local_files} # FIXME WARNING can get big
# FIXME have to compute file_index here because for some reason
# computing local_dirs will remove folders entirely !??
local_dirs = set(
p.relative_to(self.anchor) for p in local_paths if p.is_dir())
if local_dirs:
rcs = list(rcs) # sigh
remote_dirs = set(c for c in rcs if c.is_dir())
rd = set(
d.as_path()
for d in remote_dirs) # FIXME as_path => lots of network calls
old_local = local_dirs - rd
while old_local:
thisl = sorted(old_local, key=lambda d: len(d.as_posix()))
for d in thisl:
ad = self.anchor.local / d
if ad.cache is None:
log.critical(
f'would you fix the nullability already? {d}')
continue
new = ad.cache.refresh()
#log.info(f'{new}')
local_dirs = set(
ld for ld in local_dirs
if not ld.as_posix().startswith(d.as_posix()))
old_local = local_dirs - rd
if sparse:
#if local_dirs:
#gen = (c for c in _local_remotes if c.is_dir() or (c.is_file() and c._sparse_include()))
#else:
gen = (c for c in rcs
if c.is_dir() or (c.is_file() and c._sparse_include()))
# FIXME rcs still takes too long, though using the generator
# does get some useful work done first
else:
# FIXME horrid performance on remotes with loads of files
gen = sorted(rcs, key=lambda c: len(c.as_path().as_posix()))
for child in gen:
# use the remote's recursive implementation
# not the local implementation, since the
# remote may have additional requirements
#child.bootstrap(only=only, skip=skip)
# because of how remote works now we don't even have to
# bootstrap this
cc = child.cache
if cc is None:
if child.is_file() and child.id in file_index:
_cache = file_index[child.id].cache
cmeta = _cache.meta
rmeta = child.meta
file_is_different, nmeta = self._update_meta(cmeta, rmeta)
if file_is_different:
log.critical(f'WAT {_cache}')
else:
yield _cache
# yield the old cache if it exists
# otherwise consumers of bootstrap will
# think the file may have been deleted
continue
cc = child.cache_init()
log.debug(cc)
yield cc
def meta(self, pathmeta):
if not self.exists():
# if the path does not exist write even temporary to disk
if self.is_symlink():
meta = self.meta
if meta == pathmeta:
log.debug(
f'Metadata unchanged for {meta.id}. Not updating.')
return
if meta.id != pathmeta.id:
msg = ('Existing cache id does not match new id!\n'
f'{self!r}\n'
f'{meta.id} != {pathmeta.id}\n'
f'{meta.as_pretty()}\n'
f'{pathmeta.as_pretty()}')
log.critical(msg)
meta_newer = 'Meta newer. Not updating.'
pathmeta_newer = 'Other meta newer.'
msg = '{}' # apparently I was out of my mind when I wrote this originally ...
if meta.updated is None and pathmeta.updated is None:
log.warning(
'no change since either has an updated value (wat)'
)
return #FIXME
if meta.updated > pathmeta.updated:
log.info(msg.format(meta_newer))
return # this is the right thing to do for a sane filesystem
elif meta.updated < pathmeta.updated:
log.info(msg.format(pathmeta_newer))
# THIS IS EXPLICITLY ALLOWED
else: # they are equal
extra = 'Both updated at the same time '
if meta.created is not None and pathmeta.created is not None:
if meta.created > pathmeta.created:
log.info(msg.format(extra + meta_newer))
return
elif meta.created < pathmeta.created:
log.info(msg.format(extra + pathmeta_newer))
# THIS IS EXPLICITLY ALLOWED
else: # same created
log.info(
msg.format(
'Identical timestamps. Not updating.'))
return
elif meta.created is not None:
log.info(
msg.format(
extra +
'Meta has datetime other does not. Not updating.'
))
return
elif pathmeta.created is not None:
msg = msg.format(
extra + 'Meta has no datetime other does.')
log.info(msg)
raise exc.MetadataIdMismatchError(msg)
else: # both none
log.info(
msg.format(extra + (
'Identical update time both missing created time. '
'Not updating.')))
return
# equality
# id mismatch all cases above should return or raise except for other metadata newer
if meta.size is not None and pathmeta.size is None:
log.error('new meta has no size so will not overwrite')
return
# FIXME do the timestamp dance above here
log.debug('Metadata exists, but ids match so will update')
# trash old versions instead of just unlinking
pc = self.local.cache
trash = pc.trash
self.rename(trash / f'{pc.parent.id}-{meta.id}-{self.name}')
#self.unlink()
# FIXME if an id starts with / then the local name is overwritten due to pathlib logic
# we need to error if that happens
#symlink = pathlib.PurePosixPath(self.local.name, pathmeta.as_symlink().as_posix().strip('/'))
symlink = pathlib.PurePosixPath(
self.local.name) / pathmeta.as_symlink()
self.local.symlink_to(symlink)
else:
raise exc.PathExistsError(f'Path exists {self}')
