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#!/usr/bin/env python
#
# cups.py: a FUSE filesystem for mounting an LDAP directory in Python
# Need python-fuse bindings, and an LDAP server.
# usage: ./cups.py <mountpoint>
# unmount with fusermount -u <mountpoint>
#
import stat
import errno
import fuse
from time import time
from subprocess import Popen, PIPE
fuse.fuse_python_api = (0, 2)
class MyStat(fuse.Stat):
def __init__(self):
self.st_mode = stat.S_IFDIR | 0o755
self.st_ino = 0
self.st_dev = 0
self.st_nlink = 2
self.st_uid = 0
self.st_gid = 0
self.st_size = 4096
self.st_atime = 0
self.st_mtime = 0
self.st_ctime = 0
class CupsFS(fuse.Fuse):
def __init__(self, *args, **kw):
fuse.Fuse.__init__(self, *args, **kw)
# Get our list of printers available.
lpstat = Popen(['lpstat -p'], shell=True, stdout=PIPE)
output = lpstat.communicate()[0]
lines = output.split(b'\n')
lpstat.wait()
self.printers = {}
self.files = {}
self.lastfiles = {}
for line in lines:
words = line.split(b' ')
if len(words) > 2:
self.printers[words[1]] = []
def getattr(self, path):
st = MyStat()
pe = path.split('/')[1:]
st.st_atime = int(time())
st.st_mtime = st.st_atime
st.st_ctime = st.st_atime
if path == '/':
pass
elif pe[-1] in self.printers:
pass
elif pe[-1] in self.lastfiles:
st.st_mode = stat.S_IFREG | 0o666
st.st_nlink = 1
st.st_size = len(self.lastfiles[pe[-1]])
else:
return -errno.ENOENT
return st
def readdir(self, path, offset):
dirents = ['.', '..']
if path == '/':
dirents.extend(list(self.printers.keys()))
else:
dirents.extend(self.printers[path[1:]])
for r in dirents:
yield fuse.Direntry(r)
def mknod(self, path, mode, dev):
pe = path.split('/')[1:] # Path elements 0 = printer 1 = file
self.printers[pe[0]].append(pe[1])
self.files[pe[1]] = ""
self.lastfiles[pe[1]] = ""
return 0
def unlink(self, path):
pe = path.split('/')[1:] # Path elements 0 = printer 1 = file
self.printers[pe[0]].remove(pe[1])
del (self.files[pe[1]])
del (self.lastfiles[pe[1]])
return 0
def read(self, path, size, offset):
pe = path.split('/')[1:] # Path elements 0 = printer 1 = file
return self.lastfiles[pe[1]][offset:offset + size]
def write(self, path, buf, offset):
pe = path.split('/')[1:] # Path elements 0 = printer 1 = file
self.files[pe[1]] += buf
return len(buf)
def release(self, path, flags):
pe = path.split('/')[1:] # Path elements 0 = printer 1 = file
if len(self.files[pe[1]]) > 0:
lpr = Popen(['lpr -P ' + pe[0]], shell=True, stdin=PIPE)
lpr.communicate(input=self.files[pe[1]])
lpr.wait()
self.lastfiles[pe[1]] = self.files[pe[1]]
self.files[pe[1]] = "" # Clear out string
return 0
def open(self, path, flags):
return 0
def truncate(self, path, size):
return 0
def utime(self, path, times):
return 0
def mkdir(self, path, mode):
return 0
def rmdir(self, path):
return 0
def rename(self, pathfrom, pathto):
return 0
def fsync(self, path, isfsyncfile):
return 0
def main():
usage = """
CupsFS: A filesystem to allow printing for applications that can
only print to file.
""" + fuse.Fuse.fusage
server = CupsFS(version="%prog " + fuse.__version__,
usage=usage, dash_s_do='setsingle')
server.parse(errex=1)
server.main()
if __name__ == '__main__':
main()
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