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#!/usr/bin/python
#
# July 2008: Bryan Newbold <bryannewbold.com>
# Proof of concept with a little help from xmp.py
#
# Simplified BSD License: http://www.opensource.org/licenses/bsd-license.php
#
# See README.nsfs
from time import time
from StringIO import StringIO
import stat # for file properties
import os # for filesystem modes (O_RDONLY, etc)
import errno # for error number codes (ENOENT, etc)
# - note: these must be returned as negatives
# pull in some spaghetti to make this stuff work without fuse-py being installed
try:
import _find_fuse_parts
except ImportError:
pass
import fuse
from fuse import Fuse
if not hasattr(fuse, '__version__'):
raise RuntimeError, \
"your fuse-py doesn't know of fuse.__version__, probably it's too old."
fuse.fuse_python_api = (0, 2)
class DefaultStat(fuse.Stat):
def __init__(self):
self.st_mode = 0
self.st_ino = 0
self.st_dev = 0
self.st_nlink = 0
self.st_uid = 0
self.st_gid = 0
self.st_size = 0
self.st_atime = 0
self.st_mtime = 0
self.st_ctime = 0
class DefaultStatVfs(fuse.StatVfs):
def __init__(self):
self.f_bavail = 0
self.f_bfree = 0
self.f_blocks = 0
self.f_bsize = 0
self.f_favail = 0
self.f_ffree = 0
self.f_files = 0
self.f_flag = 0
self.f_frsize = 0
self.f_namemax = 0
self.n_fields = 0
self.n_sequence_fields = 0
self.n_unamed_fields = 0
class NamespaceFS(Fuse):
"""Generates a file system from a python namespace, for kicks.
"""
def __init__(self, *args, **kw):
Fuse.__init__(self, *args, **kw)
self.context = self.GetContext()
#self.file_class = NsfsFile
print '*** init complete'
def getattr(self, path):
"""
- st_mode (protection bits)
- st_ino (inode number)
- st_dev (device)
- st_nlink (number of hard links)
- st_uid (user ID of owner)
- st_gid (group ID of owner)
- st_size (size of file, in bytes)
- st_atime (time of most recent access)
- st_mtime (time of most recent content modification)
- st_ctime (platform dependent; time of most recent metadata change on
Unix, or the time of creation on Windows).
"""
print '*** getattr', path
st = DefaultStat()
#st.st_uid = self.context['uid']
#st.st_gid = self.context['gid']
if path == '/':
# root directory
st.st_mode = stat.S_IFDIR | 0755
st.st_nlink = 2
return st
# we want this in the form 'module/submod/stuff'
l = path.strip('/').split('/')
# recursively check the namespace
try:
l[0] = globals()[l[0]]
if len(l) > 1:
thing = reduce(getattr, l)
else:
thing = l[0]
except:
return -errno.ENOENT # nope, not there
# for now, only modules are directories
if isinstance(thing, type(fuse)):
st.st_mode = stat.S_IFDIR | 0755
st.st_nlink = 2
else:
st.st_mode = stat.S_IFREG | 0444
st.st_size = len(str(thing)) # how big?
st.st_nlink = 1
return st
def readdir(self, path, offset):
print '*** readdir', path, offset
if path == '/':
retl = globals().keys()
else:
# we want this in the form 'module/submod/stuff'
l = path.strip('/').split('/')
# recursively check the namespace
try:
print '* trying ', l
l[0] = globals()[l[0]]
if len(l) == 1:
retl = l[0].__dict__.keys()
else:
retl = reduce(getattr, l).__dict__.keys()
except:
raise IOError(-errno.ENOENT) # nope, not there
retl.insert(0, '..')
retl.insert(0, '.')
for r in retl:
yield fuse.Direntry(r)
def open ( self, path, flags ):
print '*** open', path, flags
# we want this in the form 'module/submod/stuff'
l = path.strip('/').split('/')
# recursively check the namespace
try:
print '* trying ', l
l[0] = globals()[l[0]]
if len(l) == 1:
thing = l[0]
else:
thing = reduce(getattr, l)
except:
raise IOError(-errno.ENOENT) # nope, not there
# only allow read unless it's a string
writeok = False
if isinstance(thing, type(".")):
writeok = True
accmode = os.O_RDONLY | os.O_WRONLY | os.O_RDWR
if (flags & accmode) and writeok:
return
elif (flags & accmode) != os.O_RDONLY:
return -errno.EACCES
def read ( self, path, length, offset ):
print '*** read', path, length, offset
# we want this in the form 'module/submod/stuff'
l = path.strip('/').split('/')
# recursively check the namespace
try:
print '* trying ', l
l[0] = globals()[l[0]]
if len(l) == 1:
thing = l[0]
else:
thing = reduce(getattr, l)
except:
raise IOError(-errno.ENOENT) # nope, not there
tstr = str(thing)
slen = len(tstr)
if offset < tstr:
if offset + length > slen:
size = slen - offset
buf = tstr[offset:offset+length]
else:
buf = ''
return buf
def statfs ( self ):
print '*** statfs'
#return -errno.ENOSYS
fst = DefaultStatVfs()
fst.f_namemax = 256
return fst
def link ( self, targetPath, linkPath ):
print '*** link', targetPath, linkPath
t = targetPath.strip('/').split('/')
# recursively check the namespace; target can't be / for now
try:
print '* trying ', t
t[0] = globals()[t[0]]
if len(t) == 1:
target = t[0]
else:
target = reduce(getattr, t)
except:
return -errno.ENOENT # nope, not there
l = linkPath.strip('/').split('/')
if (len(l) == 1) and (l[0] != '') and not (l[0] in globals().keys()):
# easy, good to go
globals()[l[0]] = target
print '* trying easy ', l[0], target
return
# otherwise...
# recursively check the namespace; link can't be /
try:
print '* trying ', l
l[0] = globals()[l[0]]
if len(l) == 1:
raise IOError(-errno.ENOENT) # can't do root or existing
elif len(l) == 2:
lp = l[0]
else:
lp = reduce(getattr, l[:-1]) # want the parent of the link
except:
return -errno.ENOENT # nope, not there
# if that all worked out with no errors...
lp.__setattr__(l[-1], target)
def unlink ( self, path ):
print '*** unlink', path
l = path.strip('/').split('/')
if (len(l) == 1) and (l[0] != '') and (l[0] in globals().keys()):
# easy, good to go
del globals()[l[0]]
return
try:
print '* trying ', l
l[0] = globals()[l[0]]
if len(l) == 1:
return -errno.ENOENT # something is wrong, shouldn't get here
elif len(l) == 2:
lp = l[0]
else:
lp = reduce(getattr, l[:-1]) # want the parent of the link
except:
return -errno.ENOENT # nope, not there
lp.__delattr__(l[-1])
def write ( self, path, buf, offset ):
print '*** write', path, buf, offset
# we want this in the form 'module/submod/stuff'
l = path.strip('/').split('/')
# recursively check the namespace
try:
print '* trying ', l
l[0] = globals()[l[0]]
if len(l) == 1:
thing = l[0]
else:
thing = reduce(getattr, l)
except:
print '* ACTUALLY CAN\'T FIND'
raise IOError(-errno.ENOENT) # nope, not there
if not isinstance(thing, type(".")):
print '* WRONG TYPE'
raise IOError(-errno.ENOENT) # wrong file type
# Kind of a slow way to go?
sfile = StringIO(thing)
sfile.seek(offset)
sfile.write(buf)
sfile.flush()
thing = sfile.getvalue()
sfile.close()
# recursively check the namespace
l = path.strip('/').split('/')
#try:
if len(l) == 1:
globals()[l[0]] = thing
return len(buf)
l[0] = globals()[l[0]]
tp = reduce(getattr, l[:-1])
tp.__setattr__(l[-1], thing)
print '* TRIED ', thing
return len(buf)
#except: # raise IOError(-errno.ENOENT) # nope, not there
def release ( self, path, flags ):
print '*** release', path, flags
return -errno.ENOSYS
def fsync ( self, path, isFsyncFile ):
print '*** fsync', path, isFsyncFile
return -errno.ENOSYS
def mknod ( self, path, mode, dev ):
print '*** mknod', path, oct(mode), dev
return -errno.ENOSYS
def rmdir ( self, path ):
print '*** rmdir', path
return -errno.ENOSYS
def getdir(self, path):
print '*** getdir', path
return self.readdir(path, 0)
def mythread ( self ):
print '*** mythread'
return -errno.ENOSYS
def chmod ( self, path, mode ):
print '*** chmod', path, oct(mode)
return -errno.ENOSYS
def chown ( self, path, uid, gid ):
print '*** chown', path, uid, gid
return -errno.ENOSYS
def mkdir ( self, path, mode ):
print '*** mkdir', path, oct(mode)
return -errno.ENOSYS
def readlink ( self, path ):
print '*** readlink', path
return -errno.ENOSYS
def rename ( self, oldPath, newPath ):
print '*** rename', oldPath, newPath
globals()[path1] = globals()[path]
del globals()[path]
#return -errno.ENOSYS
def symlink ( self, targetPath, linkPath ):
print '*** symlink', targetPath, linkPath
return -errno.ENOSYS
def truncate ( self, path, size ):
print '*** truncate', path, size
return -errno.ENOSYS
def utime ( self, path, times ):
print '*** utime', path, times
return -errno.ENOSYS
# This isn't actually used yet
class NsfsFile(object):
def init(self, path, flags, mode=None):
# if mode != None: NEW FILE
# we want this in the form 'module/submod/stuff'
l = path.strip('/').split('/')
# recursively check the namespace
try:
l[0] = globals()[l[0]]
self.thing = reduce(getattr, l)
except:
return -errno.ENOENT # nope, not there
self.tstr = str(self.thing)
self.tfile = StringIO(self.tfile)
def read(self, len, offset):
#return -errno.ENOSYS
return read(self.tfile, len, offset)
def release(self, flags):
self.tfile.close()
def main():
usage="""
Experimental Python Namespace Filesystem
""" + Fuse.fusage
server = NamespaceFS(version="%prog " + fuse.__version__,
usage=usage,
dash_s_do='setsingle')
server.parse(errex=1)
server.flags = 0
server.multithreaded = 0
print "let's go!"
server.main()
if __name__ == '__main__':
main()
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