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from stat import S_IFDIR
class FuseCache():
def __init__(self):
# Initialize virtual root
self.cache = {}
# Cache tuple:
# (dict of attrs, dict of children in folder)
def getattr(self, path):
paths = [p for p in path.split('/') if len(p) > 0]
#print(paths)
# Virtual root
st = dict(st_mode=(S_IFDIR | 0o755), st_nlink=2)
c = self.cache
for p in paths:
if c == None:
return None
if p not in c:
return None
(st, c) = c[p]
return st
def getkids(self, path):
paths = [p for p in path.split('/') if len(p) > 0]
c = self.cache
for p in paths:
if c == None:
return None
if p not in c:
return None
(_, c) = c[p]
return c
# Set a cache node's children and their attributes.
# This implicitly purges any prvious children from the cache.
# Thus, those directories will be re-scanned next time.
def setkids(self, path, children):
paths = [p for p in path.split('/') if len(p) > 0]
c = self.cache
for p in paths:
# We expect to be able to walk the path, because we can't get
# there without Linux' VFS stat'ing all directories leading up.
parent = c
(_, c) = c[p]
if (c == self.cache):
self.cache = children
else:
(st, _) = parent[p]
parent[p] = (st, children)
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