/usr/share/system-config-printer/troubleshoot/CheckUSBPermissions.py is in system-config-printer-gnome 1.5.7+20160212-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 | #!/usr/bin/python3
## Printing troubleshooter
## Copyright (C) 2008, 2009, 2010, 2014 Red Hat, Inc.
## Authors:
## Tim Waugh <twaugh@redhat.com>
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
import glob
import os
import subprocess
from timedops import TimedSubprocess
import urllib.parse
from .base import *
from gi.repository import Gtk
class CheckUSBPermissions(Question):
def __init__ (self, troubleshooter):
Question.__init__ (self, troubleshooter, "Check USB permissions")
troubleshooter.new_page (Gtk.Label (), self)
def display (self):
self.answers = {}
answers = self.troubleshooter.answers
if answers['cups_queue_listed']:
if answers['is_cups_class']:
return False
cups_printer_dict = answers['cups_printer_dict']
device_uri = cups_printer_dict['device-uri']
elif answers.get ('cups_device_listed', False):
device_uri = answers['cups_device_uri']
else:
return False
(scheme, rest) = urllib.parse.splittype (device_uri)
if scheme not in ['hp', 'hpfax', 'usb', 'hal']:
return False
LSUSB = "/sbin/lsusb"
if not os.access (LSUSB, os.X_OK):
return False
GETFACL = "/usr/bin/getfacl"
if not os.access (GETFACL, os.X_OK):
return False
new_environ = os.environ.copy()
new_environ['LC_ALL'] = "C"
# Run lsusb
parent = self.troubleshooter.get_window ()
try:
self.op = TimedSubprocess (parent=parent,
args=[LSUSB, "-v"],
close_fds=True,
env=new_environ,
stdin=subprocess.DEVNULL,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
(lsusb_stdout, lsusb_stderr, result) = self.op.run ()
except:
# Problem executing command.
return False
# Now parse it.
dev_by_id = {}
this_dev = None
for line in lsusb_stdout:
if (this_dev is not None and
((line.find ("bInterfaceClass") != -1 and
line.find ("7 Printer") != -1) or
(line.find ("bInterfaceSubClass") != -1 and
line.find ("1 Printer") != -1))):
mfr = dev_by_id.get (this_mfr_id, {})
mdl = mfr.get (this_mdl_id, [])
mdl.append (this_dev)
mfr[this_mdl_id] = mdl
dev_by_id[this_mfr_id] = mfr
this_dev = None
continue
separators = [ ('Bus ', 3),
(' Device ', 3),
(': ID ', 4),
(':', 4),
(' ', -1)]
fields = []
i = 0
p = line
while i < len (separators):
(sep, length) = separators[i]
if not p.startswith (sep):
break
start = len (sep)
if length == -1:
end = len (p)
fields.append (p[start:])
else:
end = start + length
fields.append (p[start:end])
p = p[end:]
i += 1
if i < len (separators):
continue
if not scheme.startswith ('hp') and fields[2] != '03f0':
# Skip non-HP printers if we know we're using HPLIP.
continue
this_dev = { 'bus': fields[0],
'dev': fields[1],
'name': fields[4],
'full': line }
this_mfr_id = fields[2]
this_mdl_id = fields[3]
infos = {}
paths = []
if not scheme.startswith ('hp'):
paths.extend (glob.glob ("/dev/usb/lp?"))
for mfr_id, mdls in dev_by_id.items ():
for mdl_id, devs in mdls.items ():
for dev in devs:
path = "/dev/bus/usb/%s/%s" % (dev['bus'], dev['dev'])
paths.append (path)
infos[path] = dev['full']
perms = []
for path in paths:
try:
self.op = TimedSubprocess (parent=parent,
args=[GETFACL, path],
close_fds=True,
env=new_environ,
stdin=subprocess.DEVNULL,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
(getfacl_stdout, getfacl_stderr, result) = self.op.run ()
output = [x for x in getfacl_stdout if len (x) > 0]
except:
# Problem executing command.
output = []
info = infos.get (path, path)
perms.append ((info, output))
self.answers['getfacl_output'] = perms
# Don't actually display anything, just collect information.
return False
def collect_answer (self):
return self.answers
def cancel_operation (self):
self.op.cancel ()
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