[1177] | 1 | #! /usr/bin/env python |
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| 2 | # -*- coding: ISO-8859-15 -*- |
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| 3 | |
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| 4 | # CUPSPyKota accounting backend |
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| 5 | # |
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| 6 | # PyKota - Print Quotas for CUPS and LPRng |
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| 7 | # |
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| 8 | # (c) 2003 Jerome Alet <alet@librelogiciel.com> |
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| 9 | # This program is free software; you can redistribute it and/or modify |
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| 10 | # it under the terms of the GNU General Public License as published by |
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| 11 | # the Free Software Foundation; either version 2 of the License, or |
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| 12 | # (at your option) any later version. |
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| 13 | # |
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| 14 | # This program is distributed in the hope that it will be useful, |
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| 15 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | # GNU General Public License for more details. |
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| 18 | # |
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| 19 | # You should have received a copy of the GNU General Public License |
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| 20 | # along with this program; if not, write to the Free Software |
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| 21 | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. |
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| 22 | # |
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| 23 | # $Id$ |
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| 24 | # |
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| 25 | # $Log$ |
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[1183] | 26 | # Revision 1.5 2003/11/14 18:31:27 jalet |
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| 27 | # Not perfect, but seems to work with the poll() loop. |
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| 28 | # |
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[1182] | 29 | # Revision 1.4 2003/11/14 17:04:15 jalet |
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| 30 | # More (untested) work on the CUPS backend. |
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| 31 | # |
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[1180] | 32 | # Revision 1.3 2003/11/12 23:27:44 jalet |
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| 33 | # More work on new backend. This commit may be unstable. |
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| 34 | # |
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[1178] | 35 | # Revision 1.2 2003/11/12 09:33:34 jalet |
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| 36 | # New CUPS backend supports device enumeration |
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| 37 | # |
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[1177] | 38 | # Revision 1.1 2003/11/08 16:05:31 jalet |
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| 39 | # CUPS backend added for people to experiment. |
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| 40 | # |
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| 41 | # |
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| 42 | # |
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| 43 | |
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| 44 | import sys |
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| 45 | import os |
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[1182] | 46 | import popen2 |
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[1177] | 47 | import time |
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[1178] | 48 | import cStringIO |
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| 49 | import shlex |
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[1182] | 50 | import select |
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| 51 | import signal |
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[1177] | 52 | |
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| 53 | from pykota.tool import PyKotaTool, PyKotaToolError |
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| 54 | from pykota.config import PyKotaConfigError |
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| 55 | from pykota.storage import PyKotaStorageError |
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| 56 | from pykota.accounter import openAccounter, PyKotaAccounterError |
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| 57 | from pykota.requester import openRequester, PyKotaRequesterError |
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| 58 | |
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[1182] | 59 | class PyKotaPopen3(popen2.Popen3) : |
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| 60 | """Our own class to execute real backends. |
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| 61 | |
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| 62 | Their first argument is different from their path so using |
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| 63 | native popen2.Popen3 would not be feasible. |
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| 64 | """ |
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| 65 | def __init__(self, cmd, capturestderr=False, bufsize=-1, arg0=None) : |
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| 66 | self.arg0 = arg0 |
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| 67 | popen2.Popen3.__init__(self, cmd, capturestderr, bufsize) |
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| 68 | |
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| 69 | def _run_child(self, cmd): |
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[1183] | 70 | for i in range(3, 256): # TODO : MAXFD in original popen2 module |
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[1182] | 71 | try: |
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| 72 | os.close(i) |
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| 73 | except OSError: |
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| 74 | pass |
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| 75 | try: |
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| 76 | os.execvpe(cmd[0], [self.arg0 or cmd[0]] + cmd[1:], os.environ) |
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| 77 | finally: |
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| 78 | os._exit(1) |
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| 79 | |
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[1177] | 80 | class PyKotaBackend(PyKotaTool) : |
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| 81 | """Class for the PyKota backend.""" |
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| 82 | def __init__(self) : |
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| 83 | PyKotaTool.__init__(self) |
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| 84 | (self.printingsystem, \ |
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| 85 | self.printerhostname, \ |
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| 86 | self.printername, \ |
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| 87 | self.username, \ |
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| 88 | self.jobid, \ |
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| 89 | self.inputfile, \ |
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| 90 | self.copies, \ |
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| 91 | self.title, \ |
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| 92 | self.options, \ |
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| 93 | self.originalbackend) = self.extractCUPSInfo() |
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| 94 | self.accounter = openAccounter(self) |
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| 95 | |
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| 96 | def extractCUPSInfo(self) : |
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| 97 | """Returns a tuple (printingsystem, printerhostname, printername, username, jobid, filename, title, options, backend). |
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| 98 | |
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| 99 | Returns (None, None, None, None, None, None, None, None, None, None) if no printing system is recognized. |
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| 100 | """ |
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| 101 | # Try to detect CUPS |
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| 102 | if os.environ.has_key("CUPS_SERVERROOT") and os.path.isdir(os.environ.get("CUPS_SERVERROOT", "")) : |
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| 103 | if len(sys.argv) == 7 : |
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| 104 | inputfile = sys.argv[6] |
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| 105 | else : |
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| 106 | inputfile = None |
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| 107 | |
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| 108 | # the DEVICE_URI environment variable's value is |
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| 109 | # prefixed with "cupspykota:" otherwise we wouldn't |
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| 110 | # be called. We have to remove this from the environment |
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| 111 | # before launching the real backend. |
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| 112 | fulldevice_uri = os.environ.get("DEVICE_URI", "") |
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| 113 | device_uri = fulldevice_uri[len("cupspykota:"):] |
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| 114 | os.environ["DEVICE_URI"] = device_uri |
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| 115 | # TODO : check this for more complex urls than ipp://myprinter.dot.com:631/printers/lp |
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| 116 | try : |
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| 117 | (backend, destination) = device_uri.split(":", 1) |
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| 118 | except ValueError : |
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| 119 | raise PyKotaToolError, "Invalid DEVICE_URI : %s\n" % device_uri |
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| 120 | while destination.startswith("/") : |
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| 121 | destination = destination[1:] |
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| 122 | printerhostname = destination.split("/")[0].split(":")[0] |
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| 123 | return ("CUPS", \ |
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| 124 | printerhostname, \ |
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| 125 | os.environ.get("PRINTER"), \ |
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| 126 | sys.argv[2].strip(), \ |
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| 127 | sys.argv[1].strip(), \ |
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| 128 | inputfile, \ |
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| 129 | int(sys.argv[4].strip()), \ |
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| 130 | sys.argv[3], \ |
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| 131 | sys.argv[5], \ |
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| 132 | backend) |
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| 133 | else : |
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| 134 | self.logger.log_message(_("Printing system unknown, args=%s") % " ".join(sys.argv), "warn") |
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| 135 | return (None, None, None, None, None, None, None, None, None, None) # Unknown printing system |
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| 136 | |
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| 137 | def format_commandline(prt, usr, cmdline) : |
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| 138 | """Passes printer and user names on the command line.""" |
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| 139 | printer = prt.Name |
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| 140 | user = usr.Name |
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| 141 | # we don't want the external command's standard |
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| 142 | # output to break the print job's data, but we |
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| 143 | # want to keep its standard error |
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| 144 | return "%s >/dev/null" % (cmdline % locals()) |
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| 145 | |
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[1182] | 146 | def sigterm_handler(signum, frame) : |
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| 147 | """Handler for SIGTERM.""" |
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| 148 | sys.exit(1) |
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| 149 | |
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[1177] | 150 | def main(thebackend) : |
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| 151 | """Do it, and do it right !""" |
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[1182] | 152 | # first deal with signals |
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| 153 | # CUPS backends ignore SIGPIPE and exit(1) on SIGTERM |
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| 154 | # Fortunately SIGPIPE is already ignored by Python |
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| 155 | # It's there just in case this changes in the future |
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| 156 | signal.signal(signal.SIGPIPE, signal.SIG_IGN) |
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| 157 | signal.signal(signal.SIGTERM, sigterm_handler) |
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| 158 | |
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[1177] | 159 | # |
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| 160 | # Get the last page counter and last username from the Quota Storage backend |
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| 161 | printer = thebackend.storage.getPrinter(thebackend.printername) |
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| 162 | if not printer.Exists : |
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| 163 | # The printer is unknown from the Quota Storage perspective |
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| 164 | # we let the job pass through, but log a warning message |
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| 165 | thebackend.logger.log_message(_("Printer %s not registered in the PyKota system") % thebackend.printername, "warn") |
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[1180] | 166 | action = "ALLOW" |
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[1177] | 167 | else : |
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| 168 | for dummy in range(2) : |
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| 169 | user = thebackend.storage.getUser(thebackend.username) |
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| 170 | if user.Exists : |
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| 171 | break |
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| 172 | else : |
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| 173 | # The user is unknown from the Quota Storage perspective |
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| 174 | # Depending on the default policy for this printer, we |
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| 175 | # either let the job pass through or reject it, but we |
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| 176 | # log a message in any case. |
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| 177 | (policy, args) = thebackend.config.getPrinterPolicy(thebackend.printername) |
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| 178 | if policy == "ALLOW" : |
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| 179 | action = "POLICY_ALLOW" |
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| 180 | elif policy == "EXTERNAL" : |
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| 181 | commandline = format_commandline(printer, user, args) |
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| 182 | thebackend.logger.log_message(_("User %s not registered in the PyKota system, applying external policy (%s) for printer %s") % (thebackend.username, commandline, thebackend.printername), "info") |
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| 183 | if os.system(commandline) : |
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| 184 | # if an error occured, we die without error, |
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| 185 | # so that the job doesn't stop the print queue. |
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| 186 | thebackend.logger.log_message(_("External policy %s for printer %s produced an error. Job rejected. Please check PyKota's configuration files.") % (commandline, thebackend.printername), "error") |
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| 187 | return 0 |
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| 188 | else : |
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| 189 | # here we try a second time, because the goal |
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| 190 | # of the external action was to add the user |
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| 191 | # in the database. |
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| 192 | continue |
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| 193 | else : |
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| 194 | action = "POLICY_DENY" |
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| 195 | thebackend.logger.log_message(_("User %s not registered in the PyKota system, applying default policy (%s) for printer %s") % (thebackend.username, action, thebackend.printername), "warn") |
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| 196 | if action == "POLICY_DENY" : |
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| 197 | # if not allowed to print then die, else proceed. |
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| 198 | # we die without error, so that the job doesn't |
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| 199 | # stop the print queue. |
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| 200 | return 0 |
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| 201 | # when we get there, the printer policy allows the job to pass |
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| 202 | break |
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| 203 | |
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| 204 | if user.Exists : |
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| 205 | # Is the current user allowed to print at all ? |
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| 206 | action = thebackend.warnUserPQuota(thebackend.storage.getUserPQuota(user, printer)) |
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| 207 | elif policy == "EXTERNAL" : |
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| 208 | # if the extenal policy produced no error, but the |
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| 209 | # user still doesn't exist, we die without error, |
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| 210 | # so that the job doesn't stop the print queue. |
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| 211 | thebackend.logger.log_message(_("External policy %s for printer %s couldn't add user %s. Job rejected.") % (commandline, thebackend.printername, thebackend.username), "error") |
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| 212 | return 0 |
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| 213 | |
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| 214 | if action not in ["ALLOW", "WARN"] : |
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| 215 | # if not allowed to print then die, else proceed. |
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| 216 | # we die without error, so that the job doesn't |
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| 217 | # stop the print queue. |
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| 218 | retcode = 0 |
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| 219 | else : |
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| 220 | # pass the job untouched to the underlying layer |
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[1180] | 221 | # and starts accounting at the same time |
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| 222 | thebackend.accounter.beginJob(printer, user) |
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[1177] | 223 | |
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[1180] | 224 | # executes original backend |
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[1182] | 225 | mustclose = 0 |
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| 226 | if thebackend.inputfile is not None : |
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| 227 | if hasattr(thebackend.inputfile, "read") : |
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| 228 | infile = thebackend.inputfile |
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| 229 | else : |
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| 230 | infile = open(thebackend.inputfile, "rb") |
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| 231 | mustclose = 1 |
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| 232 | else : |
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| 233 | infile = sys.stdin |
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[1183] | 234 | realbackend = os.path.join(os.path.split(sys.argv[0])[0], thebackend.originalbackend) |
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[1182] | 235 | subprocess = PyKotaPopen3([realbackend] + sys.argv[1:], capturestderr=1, arg0=os.environ["DEVICE_URI"]) |
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| 236 | pollster = select.poll() |
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[1183] | 237 | pollster.register(infile.fileno(), select.POLLIN) |
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| 238 | pollster.register(subprocess.fromchild.fileno(), select.POLLIN) |
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| 239 | pollster.register(subprocess.childerr.fileno(), select.POLLIN) |
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| 240 | pollster.register(subprocess.tochild.fileno(), select.POLLOUT) |
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| 241 | inputdata = "" |
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[1182] | 242 | end = 0 |
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| 243 | while not end : |
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| 244 | availablestreams = pollster.poll() |
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| 245 | for (stream, mask) in availablestreams : |
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[1183] | 246 | if mask & select.POLLHUP : |
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| 247 | if stream == infile.fileno() : |
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| 248 | end = 1 |
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[1182] | 249 | if mask & select.POLLOUT : |
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[1183] | 250 | if stream == subprocess.tochild.fileno() : |
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| 251 | if inputdata : |
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| 252 | os.write(stream, inputdata) |
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| 253 | inputdata = "" |
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[1182] | 254 | if mask & select.POLLIN : |
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| 255 | data = os.read(stream, 256 * 1024) |
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[1183] | 256 | if stream == infile.fileno() : |
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| 257 | inputdata += data |
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| 258 | elif stream == subprocess.fromchild.fileno() : |
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[1182] | 259 | sys.stdout.write(data) |
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[1183] | 260 | elif stream == subprocess.childerr.fileno() : |
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[1182] | 261 | sys.stderr.write(data) |
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[1183] | 262 | if inputdata : |
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| 263 | try : |
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| 264 | os.write(subprocess.tochild.fileno(), inputdata) |
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| 265 | except : |
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| 266 | pass |
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| 267 | sys.stdout.flush() |
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| 268 | sys.stderr.flush() |
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[1182] | 269 | subprocess.fromchild.close() |
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| 270 | subprocess.childerr.close() |
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| 271 | subprocess.tochild.close() |
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| 272 | if mustclose : |
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| 273 | infile.close() |
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| 274 | status = subprocess.wait() |
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| 275 | if os.WIFEXITED(status) : |
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| 276 | retcode = os.WEXITSTATUS(status) |
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| 277 | else : |
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| 278 | thebackend.logger.log_message(_("CUPS backend %s died abnormally.") % realbackend, "error") |
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| 279 | retcode = -1 |
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[1177] | 280 | |
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[1180] | 281 | # stops accounting. |
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| 282 | thebackend.accounter.endJob(printer, user) |
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[1177] | 283 | |
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[1180] | 284 | # retrieve the job size |
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| 285 | jobsize = thebackend.accounter.getJobSize() |
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| 286 | |
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[1177] | 287 | # update the quota for the current user on this printer |
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| 288 | if printer.Exists : |
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| 289 | if jobsize : |
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| 290 | userquota = thebackend.storage.getUserPQuota(user, printer) |
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| 291 | if userquota.Exists : |
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| 292 | userquota.increasePagesUsage(jobsize) |
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| 293 | |
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| 294 | # adds the current job to history |
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[1180] | 295 | printer.addJobToHistory(thebackend.jobid, user, thebackend.accounter.getLastPageCounter(), action, jobsize) |
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[1177] | 296 | |
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| 297 | return retcode |
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| 298 | |
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| 299 | if __name__ == "__main__" : |
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| 300 | # This is a CUPS backend, we should act and die like a CUPS backend |
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| 301 | if len(sys.argv) == 1 : |
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[1178] | 302 | # we will execute each existing backend in device enumeration mode |
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| 303 | # and generate their PyKota accounting counterpart |
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| 304 | (directory, myname) = os.path.split(sys.argv[0]) |
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| 305 | for backend in [os.path.join(directory, b) for b in os.listdir(directory) if os.path.isfile(os.path.join(directory, b)) and (b != myname)] : |
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| 306 | answer = os.popen(backend, "r") |
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| 307 | try : |
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| 308 | devices = [line.strip() for line in answer.readlines()] |
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| 309 | except : |
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| 310 | devices = [] |
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| 311 | status = answer.close() |
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| 312 | if status is None : |
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| 313 | for d in devices : |
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[1180] | 314 | # each line is of the form : 'xxxx xxxx "xxxx xxx" "xxxx xxx"' |
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| 315 | # so we have to decompose it carefully |
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[1178] | 316 | fdevice = cStringIO.StringIO("%s" % d) |
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| 317 | tokenizer = shlex.shlex(fdevice) |
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| 318 | tokenizer.wordchars = tokenizer.wordchars + r".:,?!~/\_$*-+={}[]()#" |
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| 319 | arguments = [] |
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| 320 | while 1 : |
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| 321 | token = tokenizer.get_token() |
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| 322 | if token : |
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| 323 | arguments.append(token) |
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| 324 | else : |
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| 325 | break |
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| 326 | fdevice.close() |
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[1180] | 327 | try : |
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| 328 | (devicetype, device, name, fullname) = arguments |
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| 329 | except ValueError : |
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| 330 | pass # ignore this 'bizarre' device |
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| 331 | else : |
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| 332 | if name.startswith('"') and name.endswith('"') : |
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| 333 | name = name[1:-1] |
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| 334 | if fullname.startswith('"') and fullname.endswith('"') : |
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| 335 | fullname = fullname[1:-1] |
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| 336 | print '%s cupspykota:%s "PyKota+%s" "PyKota managed %s"' % (devicetype, device, name, fullname) |
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[1177] | 337 | retcode = 0 |
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| 338 | elif len(sys.argv) not in (6, 7) : |
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| 339 | sys.stderr.write("ERROR: %s job-id user title copies options [file]\n" % sys.argv[0]) |
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| 340 | retcode = 1 |
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| 341 | else : |
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| 342 | try : |
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| 343 | # Initializes the backend |
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| 344 | kotabackend = PyKotaBackend() |
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| 345 | retcode = main(kotabackend) |
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| 346 | except (PyKotaToolError, PyKotaConfigError, PyKotaStorageError, PyKotaAccounterError, AttributeError, KeyError, IndexError, ValueError, TypeError, IOError), msg : |
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| 347 | sys.stderr.write("ERROR : cupspykota backend failed (%s)\n" % msg) |
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| 348 | sys.stderr.flush() |
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| 349 | retcode = 1 |
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| 350 | |
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| 351 | try : |
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| 352 | kotabackend.storage.close() |
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| 353 | except (TypeError, NameError, AttributeError) : |
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| 354 | pass |
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| 355 | |
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| 356 | sys.exit(retcode) |
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