[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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[1257] | 8 | # (c) 2003-2004 Jerome Alet <alet@librelogiciel.com> |
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[1177] | 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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[1584] | 26 | # Revision 1.66 2004/07/01 19:56:25 jalet |
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| 27 | # Better dispatching of error messages |
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| 28 | # |
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[1562] | 29 | # Revision 1.65 2004/06/22 09:31:17 jalet |
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| 30 | # Always send some debug info to CUPS' back channel stream (stderr) as |
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| 31 | # informationnal messages. |
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| 32 | # |
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[1546] | 33 | # Revision 1.64 2004/06/18 13:34:46 jalet |
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| 34 | # Now all tracebacks include PyKota's version number |
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| 35 | # |
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[1542] | 36 | # Revision 1.63 2004/06/17 13:26:50 jalet |
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| 37 | # Better exception handling code |
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| 38 | # |
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[1541] | 39 | # Revision 1.62 2004/06/16 20:56:34 jalet |
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| 40 | # Smarter initialisation code |
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| 41 | # |
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[1530] | 42 | # Revision 1.61 2004/06/08 09:00:04 jalet |
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| 43 | # Fixed problem when username was passed in uppercase from Samba and we |
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| 44 | # tried to find correct line in CUPS page_log to extract the hostname. |
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| 45 | # |
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[1520] | 46 | # Revision 1.60 2004/06/03 23:14:08 jalet |
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| 47 | # Now stores the job's size in bytes in the database. |
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| 48 | # Preliminary work on payments storage : database schemas are OK now, |
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| 49 | # but no code to store payments yet. |
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| 50 | # Removed schema picture, not relevant anymore. |
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| 51 | # |
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[1519] | 52 | # Revision 1.59 2004/06/03 22:12:53 jalet |
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| 53 | # Now denies empty jobs |
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| 54 | # |
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[1517] | 55 | # Revision 1.58 2004/06/03 21:50:33 jalet |
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| 56 | # Improved error logging. |
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| 57 | # crashrecipient directive added. |
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| 58 | # Now exports the job's size in bytes too. |
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| 59 | # |
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[1515] | 60 | # Revision 1.57 2004/06/02 22:18:07 jalet |
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| 61 | # I think the bug when cancelling jobs should be fixed right now |
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| 62 | # |
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[1514] | 63 | # Revision 1.56 2004/06/02 21:50:56 jalet |
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| 64 | # Moved the sigterm capturing elsewhere |
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| 65 | # |
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[1513] | 66 | # Revision 1.55 2004/06/02 14:25:07 jalet |
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| 67 | # Should correctly capture ALL errors now |
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| 68 | # |
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[1503] | 69 | # Revision 1.54 2004/05/26 16:44:48 jalet |
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| 70 | # Now logs something when client hostname can't be extracted |
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| 71 | # |
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[1502] | 72 | # Revision 1.53 2004/05/26 14:49:35 jalet |
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| 73 | # First try at saving the job-originating-hostname in the database |
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| 74 | # |
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[1499] | 75 | # Revision 1.52 2004/05/25 09:15:13 jalet |
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| 76 | # accounter.py : old code deleted |
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| 77 | # the rest : now exports PYKOTAPRECOMPUTEDJOBSIZE and PYKOTAPRECOMPUTEDJOBPRICE |
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| 78 | # |
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[1498] | 79 | # Revision 1.51 2004/05/25 08:31:16 jalet |
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| 80 | # Heavy CPU usage seems to be fixed at least ! |
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| 81 | # |
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[1497] | 82 | # Revision 1.50 2004/05/25 05:17:50 jalet |
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| 83 | # Now precomputes the job's size only if current printer's enforcement |
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| 84 | # is "STRICT" |
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| 85 | # |
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[1495] | 86 | # Revision 1.49 2004/05/24 22:45:48 jalet |
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| 87 | # New 'enforcement' directive added |
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| 88 | # Polling loop improvements |
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| 89 | # |
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[1494] | 90 | # Revision 1.48 2004/05/24 14:36:24 jalet |
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| 91 | # Revert to old polling loop. Will need optimisations |
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| 92 | # |
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[1493] | 93 | # Revision 1.47 2004/05/24 11:59:46 jalet |
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| 94 | # More robust (?) code |
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| 95 | # |
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[1492] | 96 | # Revision 1.46 2004/05/21 22:02:51 jalet |
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| 97 | # Preliminary work on pre-accounting |
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| 98 | # |
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[1484] | 99 | # Revision 1.45 2004/05/19 07:15:32 jalet |
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| 100 | # Could the 'misterious' bug in my loop be finally fixed ??? |
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| 101 | # |
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[1483] | 102 | # Revision 1.44 2004/05/18 14:48:47 jalet |
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| 103 | # Big code changes to completely remove the need for "requester" directives, |
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| 104 | # jsut use "hardware(... your previous requester directive's content ...)" |
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| 105 | # |
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[1478] | 106 | # Revision 1.43 2004/05/17 11:46:05 jalet |
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| 107 | # First try at cupspykota's main loop rewrite |
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| 108 | # |
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[1467] | 109 | # Revision 1.42 2004/05/10 11:22:28 jalet |
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| 110 | # Typo |
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| 111 | # |
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[1466] | 112 | # Revision 1.41 2004/05/10 10:07:30 jalet |
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| 113 | # Catches OSError while reading |
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| 114 | # |
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[1465] | 115 | # Revision 1.40 2004/05/10 09:29:48 jalet |
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| 116 | # Should be more robust if we receive a SIGTERM during an I/O operation |
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| 117 | # |
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[1458] | 118 | # Revision 1.39 2004/05/07 14:44:53 jalet |
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| 119 | # Fix for file handles unregistered twice from the polling object |
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| 120 | # |
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[1433] | 121 | # Revision 1.38 2004/04/09 22:24:46 jalet |
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| 122 | # Began work on correct handling of child processes when jobs are cancelled by |
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| 123 | # the user. Especially important when an external requester is running for a |
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| 124 | # long time. |
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| 125 | # |
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[1411] | 126 | # Revision 1.37 2004/03/18 19:11:25 jalet |
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| 127 | # Fix for raw jobs in cupspykota |
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| 128 | # |
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[1410] | 129 | # Revision 1.36 2004/03/18 14:03:18 jalet |
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| 130 | # Added fsync() calls |
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| 131 | # |
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[1405] | 132 | # Revision 1.35 2004/03/16 12:05:01 jalet |
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| 133 | # Small fix for new waitprinter.sh : when job was denied, would wait forever |
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| 134 | # for printer being in printing mode. |
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| 135 | # |
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[1400] | 136 | # Revision 1.34 2004/03/15 10:47:56 jalet |
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| 137 | # This time the traceback formatting should be correct ! |
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| 138 | # |
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[1391] | 139 | # Revision 1.33 2004/03/05 12:46:07 jalet |
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| 140 | # Improve tracebacks |
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| 141 | # |
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[1390] | 142 | # Revision 1.32 2004/03/05 12:31:35 jalet |
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| 143 | # Now should output full traceback when crashing |
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| 144 | # |
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[1375] | 145 | # Revision 1.31 2004/03/01 14:35:56 jalet |
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| 146 | # PYKOTAPHASE wasn't set soon enough at the start of the job |
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| 147 | # |
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[1374] | 148 | # Revision 1.30 2004/03/01 14:34:15 jalet |
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| 149 | # PYKOTAPHASE wasn't set at the right time at the end of data transmission |
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| 150 | # to underlying layer (real backend) |
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| 151 | # |
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[1372] | 152 | # Revision 1.29 2004/03/01 11:23:25 jalet |
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| 153 | # Pre and Post hooks to external commands are available in the cupspykota |
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| 154 | # backend. Forthe pykota filter they will be implemented real soon now. |
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| 155 | # |
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[1365] | 156 | # Revision 1.28 2004/02/26 14:18:07 jalet |
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| 157 | # Should fix the remaining bugs wrt printers groups and users groups. |
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| 158 | # |
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[1335] | 159 | # Revision 1.27 2004/02/04 23:41:27 jalet |
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| 160 | # Should fix the incorrect "backend died abnormally" problem. |
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| 161 | # |
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[1321] | 162 | # Revision 1.26 2004/01/30 16:35:03 jalet |
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| 163 | # Fixes stupid software accounting bug in CUPS backend |
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| 164 | # |
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[1302] | 165 | # Revision 1.25 2004/01/16 17:51:46 jalet |
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| 166 | # Fuck Fuck Fuck !!! |
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| 167 | # |
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[1291] | 168 | # Revision 1.24 2004/01/14 15:52:01 jalet |
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| 169 | # Small fix for job cancelling code. |
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| 170 | # |
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[1289] | 171 | # Revision 1.23 2004/01/13 10:48:28 jalet |
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| 172 | # Small streams polling loop modification. |
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| 173 | # |
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[1285] | 174 | # Revision 1.22 2004/01/12 22:43:40 jalet |
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| 175 | # New formula to compute a job's price |
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| 176 | # |
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[1280] | 177 | # Revision 1.21 2004/01/12 18:17:36 jalet |
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| 178 | # Denied jobs weren't stored into the history anymore, this is now fixed. |
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| 179 | # |
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[1271] | 180 | # Revision 1.20 2004/01/11 23:22:42 jalet |
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| 181 | # Major code refactoring, it's way cleaner, and now allows automated addition |
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| 182 | # of printers on first print. |
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| 183 | # |
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[1257] | 184 | # Revision 1.19 2004/01/08 14:10:32 jalet |
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| 185 | # Copyright year changed. |
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| 186 | # |
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[1256] | 187 | # Revision 1.18 2004/01/07 16:16:32 jalet |
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| 188 | # Better debugging information |
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| 189 | # |
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[1240] | 190 | # Revision 1.17 2003/12/27 16:49:25 uid67467 |
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| 191 | # Should be ok now. |
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| 192 | # |
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| 193 | # Revision 1.17 2003/12/06 08:54:29 jalet |
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| 194 | # Code simplifications. |
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| 195 | # Added many debugging messages. |
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| 196 | # |
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[1222] | 197 | # Revision 1.16 2003/11/26 20:43:29 jalet |
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| 198 | # Inadvertantly introduced a bug, which is fixed. |
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| 199 | # |
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[1221] | 200 | # Revision 1.15 2003/11/26 19:17:35 jalet |
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| 201 | # Printing on a printer not present in the Quota Storage now results |
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| 202 | # in the job being stopped or cancelled depending on the system. |
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| 203 | # |
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[1210] | 204 | # Revision 1.14 2003/11/25 13:25:45 jalet |
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| 205 | # Boolean problem with old Python, replaced with 0 |
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| 206 | # |
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[1203] | 207 | # Revision 1.13 2003/11/23 19:01:35 jalet |
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| 208 | # Job price added to history |
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| 209 | # |
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[1200] | 210 | # Revision 1.12 2003/11/21 14:28:43 jalet |
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| 211 | # More complete job history. |
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| 212 | # |
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[1196] | 213 | # Revision 1.11 2003/11/19 23:19:35 jalet |
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| 214 | # Code refactoring work. |
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| 215 | # Explicit redirection to /dev/null has to be set in external policy now, just |
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| 216 | # like in external mailto. |
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| 217 | # |
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[1191] | 218 | # Revision 1.10 2003/11/18 17:54:24 jalet |
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| 219 | # SIGTERMs are now transmitted to original backends. |
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| 220 | # |
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[1190] | 221 | # Revision 1.9 2003/11/18 14:11:07 jalet |
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| 222 | # Small fix for bizarre urls |
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| 223 | # |
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[1186] | 224 | # Revision 1.8 2003/11/15 14:26:44 jalet |
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| 225 | # General improvements to the documentation. |
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| 226 | # Email address changed in sample configuration file, because |
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| 227 | # I receive low quota messages almost every day... |
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| 228 | # |
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[1185] | 229 | # Revision 1.7 2003/11/14 22:05:12 jalet |
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| 230 | # New CUPS backend fully functionnal. |
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| 231 | # Old CUPS configuration method is now officially deprecated. |
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| 232 | # |
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[1184] | 233 | # Revision 1.6 2003/11/14 20:13:11 jalet |
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| 234 | # We exit the loop too soon. |
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| 235 | # |
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[1183] | 236 | # Revision 1.5 2003/11/14 18:31:27 jalet |
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| 237 | # Not perfect, but seems to work with the poll() loop. |
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| 238 | # |
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[1182] | 239 | # Revision 1.4 2003/11/14 17:04:15 jalet |
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| 240 | # More (untested) work on the CUPS backend. |
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| 241 | # |
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[1180] | 242 | # Revision 1.3 2003/11/12 23:27:44 jalet |
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| 243 | # More work on new backend. This commit may be unstable. |
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| 244 | # |
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[1178] | 245 | # Revision 1.2 2003/11/12 09:33:34 jalet |
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| 246 | # New CUPS backend supports device enumeration |
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| 247 | # |
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[1177] | 248 | # Revision 1.1 2003/11/08 16:05:31 jalet |
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| 249 | # CUPS backend added for people to experiment. |
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| 250 | # |
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| 251 | # |
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| 252 | # |
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| 253 | |
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| 254 | import sys |
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| 255 | import os |
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[1478] | 256 | import fcntl |
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[1182] | 257 | import popen2 |
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[1178] | 258 | import cStringIO |
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| 259 | import shlex |
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[1182] | 260 | import select |
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| 261 | import signal |
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[1291] | 262 | import time |
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[1177] | 263 | |
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[1546] | 264 | from pykota.tool import PyKotaFilterOrBackend, PyKotaToolError, crashed |
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[1177] | 265 | from pykota.config import PyKotaConfigError |
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| 266 | from pykota.storage import PyKotaStorageError |
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[1196] | 267 | from pykota.accounter import PyKotaAccounterError |
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[1271] | 268 | |
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[1478] | 269 | class PyKotaPopen4(popen2.Popen4) : |
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[1182] | 270 | """Our own class to execute real backends. |
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| 271 | |
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| 272 | Their first argument is different from their path so using |
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| 273 | native popen2.Popen3 would not be feasible. |
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| 274 | """ |
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[1478] | 275 | def __init__(self, cmd, bufsize=-1, arg0=None) : |
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[1182] | 276 | self.arg0 = arg0 |
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[1478] | 277 | popen2.Popen4.__init__(self, cmd, bufsize) |
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[1182] | 278 | |
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| 279 | def _run_child(self, cmd): |
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[1183] | 280 | for i in range(3, 256): # TODO : MAXFD in original popen2 module |
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[1182] | 281 | try: |
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| 282 | os.close(i) |
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| 283 | except OSError: |
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| 284 | pass |
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| 285 | try: |
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| 286 | os.execvpe(cmd[0], [self.arg0 or cmd[0]] + cmd[1:], os.environ) |
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| 287 | finally: |
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| 288 | os._exit(1) |
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| 289 | |
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[1271] | 290 | class PyKotaBackend(PyKotaFilterOrBackend) : |
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| 291 | """A class for the pykota backend.""" |
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| 292 | def acceptJob(self) : |
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| 293 | """Returns the appropriate exit code to tell CUPS all is OK.""" |
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| 294 | return 0 |
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| 295 | |
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| 296 | def removeJob(self) : |
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| 297 | """Returns the appropriate exit code to let CUPS think all is OK. |
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[1177] | 298 | |
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[1271] | 299 | Returning 0 (success) prevents CUPS from stopping the print queue. |
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| 300 | """ |
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| 301 | return 0 |
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[1222] | 302 | |
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[1502] | 303 | def getPageLogLocation(self) : |
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| 304 | """Retrieves CUPS' page_log file location.""" |
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| 305 | location = None |
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| 306 | cupsroot = os.environ.get("CUPS_SERVERROOT", "/etc/cups") |
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| 307 | cupsdconf = os.path.join(cupsroot, "cupsd.conf") |
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| 308 | try : |
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| 309 | conffile = open(cupsdconf, "r") |
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| 310 | except IOError : |
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[1503] | 311 | self.logdebug("Unable to open %s" % cupsdconf) |
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[1502] | 312 | return # file doesn't exist or can't be read |
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| 313 | else : |
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| 314 | for line in conffile.readlines() : |
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| 315 | linecopy = line.strip().lower() |
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| 316 | if linecopy.startswith("pagelog ") : |
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| 317 | try : |
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| 318 | location = line.split()[1] |
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| 319 | except : |
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| 320 | pass # ignore errors, we take the last value in any case. |
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| 321 | conffile.close() |
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| 322 | return location |
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| 323 | |
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| 324 | def getJobOriginatingHostname(self, printername, username, jobid) : |
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| 325 | """Retrieves the job-originating-hostname from the CUPS page_log file if possible.""" |
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| 326 | pagelogpath = self.getPageLogLocation() or "/var/log/cups/page_log" |
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| 327 | try : |
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| 328 | pagelog = open(pagelogpath, "r") |
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| 329 | except IOError : |
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[1503] | 330 | self.logdebug("Unable to open %s" % pagelogpath) |
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[1502] | 331 | return # no page log or can't read it, originating hostname unknown yet |
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| 332 | else : |
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| 333 | # TODO : read backward so we could take first value seen |
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| 334 | # TODO : here we read forward so we must take the last value seen |
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[1530] | 335 | prefix = ("%s %s %s" % (printername, username, jobid)).lower() |
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[1502] | 336 | matchingline = None |
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| 337 | while 1 : |
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| 338 | line = pagelog.readline() |
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| 339 | if not line : |
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| 340 | break |
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| 341 | else : |
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| 342 | line = line.strip() |
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[1530] | 343 | if line.lower().startswith(prefix) : |
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[1502] | 344 | matchingline = line # no break, because we read forward |
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| 345 | pagelog.close() |
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| 346 | if matchingline is None : |
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[1503] | 347 | self.logdebug("No matching line found in page_log") |
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[1502] | 348 | return # correct line not found, job-originating-hostname unknown |
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| 349 | else : |
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| 350 | return matchingline.split()[-1] |
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| 351 | |
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[1271] | 352 | def doWork(self, policy, printer, user, userpquota) : |
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| 353 | """Most of the work is done here.""" |
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| 354 | # Two different values possible for policy here : |
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| 355 | # ALLOW means : Either printer, user or user print quota doesn't exist, |
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| 356 | # but the job should be allowed anyway. |
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| 357 | # OK means : Both printer, user and user print quota exist, job should |
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| 358 | # be allowed if current user is allowed to print on this printer |
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| 359 | if policy == "OK" : |
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[1372] | 360 | # exports user information with initial values |
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| 361 | self.exportUserInfo(userpquota) |
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| 362 | |
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[1502] | 363 | # tries to extract job-originating-hostname |
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| 364 | clienthost = self.getJobOriginatingHostname(printer.Name, user.Name, self.jobid) |
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[1503] | 365 | self.logdebug("Client Hostname : %s" % (clienthost or "Unknown")) |
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[1517] | 366 | os.environ["PYKOTAJOBORIGINATINGHOSTNAME"] = str(clienthost or "") |
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[1502] | 367 | |
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[1375] | 368 | # enters first phase |
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[1517] | 369 | os.environ["PYKOTAPHASE"] = "BEFORE" |
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[1375] | 370 | |
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[1519] | 371 | # do we want strict or laxist quota enforcement ? |
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[1497] | 372 | if self.config.getPrinterEnforcement(printer.Name) == "STRICT" : |
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| 373 | self.softwareJobSize = self.precomputeJobSize() |
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| 374 | self.softwareJobPrice = userpquota.computeJobPrice(self.softwareJobSize) |
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[1562] | 375 | self.sendBackChannelData("Precomputed job's size is %s pages, price is %s units" % (self.softwareJobSize, self.softwareJobPrice)) |
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[1517] | 376 | os.environ["PYKOTAPRECOMPUTEDJOBSIZE"] = str(self.softwareJobSize) |
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| 377 | os.environ["PYKOTAPRECOMPUTEDJOBPRICE"] = str(self.softwareJobPrice) |
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[1519] | 378 | |
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| 379 | # checks the user's quota |
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[1271] | 380 | action = self.warnUserPQuota(userpquota) |
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[1372] | 381 | |
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[1519] | 382 | # if no data to pass to real backend, probably a filter |
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| 383 | # higher in the chain failed because of a misconfiguration. |
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| 384 | # we deny the job in this case (nothing to print anyway) |
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| 385 | if not self.jobSizeBytes : |
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[1584] | 386 | self.printInfo(_("Job contains no data. Printing is denied."), "warn") |
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[1519] | 387 | action = "DENY" |
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| 388 | |
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[1372] | 389 | # exports some new environment variables |
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[1517] | 390 | os.environ["PYKOTAACTION"] = action |
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[1372] | 391 | |
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| 392 | # launches the pre hook |
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| 393 | self.prehook(userpquota) |
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| 394 | |
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[1562] | 395 | self.sendBackChannelData("Job accounting begins.") |
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[1271] | 396 | self.accounter.beginJob(userpquota) |
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[1280] | 397 | else : |
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| 398 | action = "ALLOW" |
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[1517] | 399 | os.environ["PYKOTAACTION"] = action |
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[1271] | 400 | |
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| 401 | # pass the job's data to the real backend |
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[1280] | 402 | if action in ["ALLOW", "WARN"] : |
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[1291] | 403 | if self.gotSigTerm : |
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[1280] | 404 | retcode = self.removeJob() |
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| 405 | else : |
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| 406 | retcode = self.handleData() |
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| 407 | else : |
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[1271] | 408 | retcode = self.removeJob() |
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| 409 | |
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| 410 | if policy == "OK" : |
---|
[1374] | 411 | # indicate phase change |
---|
[1517] | 412 | os.environ["PYKOTAPHASE"] = "AFTER" |
---|
[1374] | 413 | |
---|
[1271] | 414 | # stops accounting. |
---|
| 415 | self.accounter.endJob(userpquota) |
---|
[1562] | 416 | self.sendBackChannelData("Job accounting ends.") |
---|
[1271] | 417 | |
---|
| 418 | # retrieve the job size |
---|
[1321] | 419 | if action == "DENY" : |
---|
| 420 | jobsize = 0 |
---|
[1562] | 421 | self.sendBackChannelData("Job size forced to 0 because printing is denied.") |
---|
[1321] | 422 | else : |
---|
| 423 | jobsize = self.accounter.getJobSize() |
---|
[1562] | 424 | self.sendBackChannelData("Job size : %i" % jobsize) |
---|
[1271] | 425 | |
---|
| 426 | # update the quota for the current user on this printer |
---|
[1562] | 427 | self.sendBackChannelData("Updating user %s's quota on printer %s" % (user.Name, printer.Name)) |
---|
[1285] | 428 | jobprice = userpquota.increasePagesUsage(jobsize) |
---|
[1271] | 429 | |
---|
| 430 | # adds the current job to history |
---|
[1520] | 431 | printer.addJobToHistory(self.jobid, user, self.accounter.getLastPageCounter(), action, jobsize, jobprice, self.preserveinputfile, self.title, self.copies, self.options, clienthost, self.jobSizeBytes) |
---|
[1562] | 432 | self.sendBackChannelData("Job added to history.") |
---|
[1271] | 433 | |
---|
[1372] | 434 | # exports some new environment variables |
---|
[1517] | 435 | os.environ["PYKOTAJOBSIZE"] = str(jobsize) |
---|
| 436 | os.environ["PYKOTAJOBPRICE"] = str(jobprice) |
---|
[1372] | 437 | |
---|
[1517] | 438 | # then re-export user information with new value |
---|
[1372] | 439 | self.exportUserInfo(userpquota) |
---|
| 440 | |
---|
| 441 | # Launches the post hook |
---|
| 442 | self.posthook(userpquota) |
---|
| 443 | |
---|
[1271] | 444 | return retcode |
---|
[1478] | 445 | |
---|
[1458] | 446 | def unregisterFileNo(self, pollobj, fileno) : |
---|
| 447 | """Removes a file handle from the polling object.""" |
---|
| 448 | try : |
---|
| 449 | pollobj.unregister(fileno) |
---|
| 450 | except KeyError : |
---|
[1584] | 451 | self.printInfo(_("File number %s unregistered twice from polling object, ignored.") % fileno, "warn") |
---|
[1494] | 452 | except : |
---|
| 453 | self.logdebug("Error while unregistering file number %s from polling object." % fileno) |
---|
[1458] | 454 | else : |
---|
| 455 | self.logdebug("File number %s unregistered from polling object." % fileno) |
---|
| 456 | |
---|
[1495] | 457 | def formatFileEvent(self, fd, mask) : |
---|
[1478] | 458 | """Formats file debug info.""" |
---|
[1495] | 459 | maskval = [] |
---|
| 460 | if mask & select.POLLIN : |
---|
| 461 | maskval.append("POLLIN") |
---|
| 462 | if mask & select.POLLOUT : |
---|
| 463 | maskval.append("POLLOUT") |
---|
| 464 | if mask & select.POLLPRI : |
---|
| 465 | maskval.append("POLLPRI") |
---|
| 466 | if mask & select.POLLERR : |
---|
| 467 | maskval.append("POLLERR") |
---|
| 468 | if mask & select.POLLHUP : |
---|
| 469 | maskval.append("POLLHUP") |
---|
| 470 | if mask & select.POLLNVAL : |
---|
| 471 | maskval.append("POLLNVAL") |
---|
| 472 | return "%s (%s)" % (fd, " | ".join(maskval)) |
---|
[1478] | 473 | |
---|
[1562] | 474 | def sendBackChannelData(self, message) : |
---|
| 475 | """Sends an informational message to CUPS via back channel stream (stderr).""" |
---|
[1584] | 476 | self.printInfo("PyKota (PID %s) : %s" % (os.getpid(), message.strip())) |
---|
[1562] | 477 | |
---|
[1271] | 478 | def handleData(self) : |
---|
| 479 | """Pass the job's data to the real backend.""" |
---|
[1222] | 480 | # Find the real backend pathname |
---|
[1271] | 481 | realbackend = os.path.join(os.path.split(sys.argv[0])[0], self.originalbackend) |
---|
[1222] | 482 | |
---|
| 483 | # And launch it |
---|
[1562] | 484 | self.sendBackChannelData("Starting real backend %s with args %s" % (realbackend, " ".join(['"%s"' % a for a in ([os.environ["DEVICE_URI"]] + sys.argv[1:])]))) |
---|
[1478] | 485 | subprocess = PyKotaPopen4([realbackend] + sys.argv[1:], bufsize=0, arg0=os.environ["DEVICE_URI"]) |
---|
[1222] | 486 | |
---|
| 487 | # Save file descriptors, we will need them later. |
---|
| 488 | stderrfno = sys.stderr.fileno() |
---|
| 489 | fromcfno = subprocess.fromchild.fileno() |
---|
[1494] | 490 | tocfno = subprocess.tochild.fileno() |
---|
[1222] | 491 | |
---|
| 492 | # We will have to be careful when dealing with I/O |
---|
| 493 | # So we use a poll object to know when to read or write |
---|
| 494 | pollster = select.poll() |
---|
| 495 | pollster.register(fromcfno, select.POLLIN | select.POLLPRI) |
---|
[1494] | 496 | pollster.register(stderrfno, select.POLLOUT) |
---|
| 497 | pollster.register(tocfno, select.POLLOUT) |
---|
[1222] | 498 | |
---|
[1494] | 499 | # Initialize our buffers |
---|
| 500 | indata = "" |
---|
| 501 | outdata = "" |
---|
| 502 | endinput = endoutput = 0 |
---|
| 503 | inputclosed = outputclosed = 0 |
---|
| 504 | |
---|
[1411] | 505 | if self.preserveinputfile is None : |
---|
[1494] | 506 | # this is not a real file, we read the job's data |
---|
[1495] | 507 | # from our temporary file which is a copy of stdin |
---|
[1494] | 508 | infno = self.jobdatastream.fileno() |
---|
| 509 | self.jobdatastream.seek(0) |
---|
| 510 | pollster.register(infno, select.POLLIN | select.POLLPRI) |
---|
[1411] | 511 | else : |
---|
| 512 | # job's data is in a file, no need to pass the data |
---|
| 513 | # to the real backend |
---|
[1562] | 514 | self.sendBackChannelData("Job's data is in %s" % self.preserveinputfile) |
---|
[1494] | 515 | infno = None |
---|
| 516 | endinput = 1 |
---|
| 517 | |
---|
[1562] | 518 | self.sendBackChannelData("Entering streams polling loop...") |
---|
[1495] | 519 | MEGABYTE = 1024*1024 |
---|
[1494] | 520 | killed = 0 |
---|
| 521 | status = -1 |
---|
[1495] | 522 | while (status == -1) and (not killed) and not (inputclosed and outputclosed) : |
---|
[1494] | 523 | # First check if original backend is still alive |
---|
| 524 | status = subprocess.poll() |
---|
| 525 | |
---|
| 526 | # Now if we got SIGTERM, we have |
---|
| 527 | # to kill -TERM the original backend |
---|
| 528 | if self.gotSigTerm and not killed : |
---|
| 529 | try : |
---|
[1222] | 530 | os.kill(subprocess.pid, signal.SIGTERM) |
---|
[1495] | 531 | except OSError, msg : # ignore but logs if process was already killed. |
---|
[1514] | 532 | self.logdebug("Error while sending signal to pid %s : %s" % (subprocess.pid, msg)) |
---|
[1495] | 533 | else : |
---|
[1562] | 534 | self.sendBackChannelData(_("SIGTERM was sent to real backend %s (pid: %s)") % (realbackend, subprocess.pid)) |
---|
[1291] | 535 | killed = 1 |
---|
[1494] | 536 | |
---|
| 537 | # In any case, deal with any remaining I/O |
---|
[1498] | 538 | try : |
---|
| 539 | availablefds = pollster.poll(5000) |
---|
| 540 | except select.error, msg : |
---|
| 541 | self.logdebug("Interrupted poll : %s" % msg) |
---|
| 542 | availablefds = [] |
---|
[1495] | 543 | if not availablefds : |
---|
[1562] | 544 | self.sendBackChannelData("Nothing to do, sleeping a bit...") |
---|
[1495] | 545 | time.sleep(0.01) # give some time to the system |
---|
| 546 | else : |
---|
| 547 | for (fd, mask) in availablefds : |
---|
| 548 | # self.logdebug(self.formatFileEvent(fd, mask)) |
---|
| 549 | try : |
---|
| 550 | if mask & select.POLLOUT : |
---|
| 551 | # We can write |
---|
| 552 | if fd == tocfno : |
---|
| 553 | if indata : |
---|
| 554 | try : |
---|
| 555 | os.write(fd, indata) |
---|
[1515] | 556 | except (OSError, IOError), msg : |
---|
[1495] | 557 | self.logdebug("Error while writing to real backend's stdin %s : %s" % (fd, msg)) |
---|
| 558 | else : |
---|
| 559 | indata = "" |
---|
[1498] | 560 | else : |
---|
[1562] | 561 | self.sendBackChannelData("No data to send to real backend yet, sleeping a bit...") |
---|
[1498] | 562 | time.sleep(0.01) |
---|
| 563 | |
---|
[1495] | 564 | if endinput : |
---|
| 565 | self.unregisterFileNo(pollster, tocfno) |
---|
[1562] | 566 | self.sendBackChannelData("Closing real backend's stdin.") |
---|
[1495] | 567 | os.close(tocfno) |
---|
| 568 | inputclosed = 1 |
---|
| 569 | elif fd == stderrfno : |
---|
| 570 | if outdata : |
---|
| 571 | try : |
---|
| 572 | os.write(fd, outdata) |
---|
[1515] | 573 | except (OSError, IOError), msg : |
---|
[1495] | 574 | self.logdebug("Error while writing to CUPS back channel (stderr) %s : %s" % (fd, msg)) |
---|
| 575 | else : |
---|
| 576 | outdata = "" |
---|
[1498] | 577 | else : |
---|
| 578 | # self.logdebug("No data to send back to CUPS yet, sleeping a bit...") # Uncommenting this fills your logs |
---|
| 579 | time.sleep(0.01) # Give some time to the system, stderr is ALWAYS writeable it seems. |
---|
| 580 | |
---|
[1495] | 581 | if endoutput : |
---|
| 582 | self.unregisterFileNo(pollster, stderrfno) |
---|
| 583 | outputclosed = 1 |
---|
[1498] | 584 | else : |
---|
| 585 | self.logdebug("Unexpected : %s - Sleeping a bit..." % self.formatFileEvent(fd, mask)) |
---|
| 586 | time.sleep(0.01) |
---|
| 587 | |
---|
[1495] | 588 | if mask & (select.POLLIN | select.POLLPRI) : |
---|
| 589 | # We have something to read |
---|
| 590 | try : |
---|
| 591 | data = os.read(fd, MEGABYTE) |
---|
| 592 | except (IOError, OSError), msg : |
---|
| 593 | self.logdebug("Error while reading file %s : %s" % (fd, msg)) |
---|
| 594 | else : |
---|
| 595 | if fd == infno : |
---|
| 596 | if not data : # If yes, then no more input data |
---|
| 597 | self.unregisterFileNo(pollster, infno) |
---|
[1562] | 598 | self.sendBackChannelData("Input data ends.") |
---|
[1495] | 599 | endinput = 1 # this happens with real files. |
---|
[1498] | 600 | else : |
---|
| 601 | indata += data |
---|
[1495] | 602 | elif fd == fromcfno : |
---|
[1498] | 603 | if not data : |
---|
[1562] | 604 | self.sendBackChannelData("No back channel data to read from real backend yet, sleeping a bit...") |
---|
[1498] | 605 | time.sleep(0.01) |
---|
| 606 | else : |
---|
| 607 | outdata += data |
---|
| 608 | else : |
---|
| 609 | self.logdebug("Unexpected : %s - Sleeping a bit..." % self.formatFileEvent(fd, mask)) |
---|
| 610 | time.sleep(0.01) |
---|
| 611 | |
---|
[1495] | 612 | if mask & (select.POLLHUP | select.POLLERR) : |
---|
| 613 | # Treat POLLERR as an EOF. |
---|
| 614 | # Some standard I/O stream has no more datas |
---|
| 615 | self.unregisterFileNo(pollster, fd) |
---|
[1494] | 616 | if fd == infno : |
---|
[1495] | 617 | # Here we are in the case where the input file is stdin. |
---|
| 618 | # which has no more data to be read. |
---|
[1562] | 619 | self.sendBackChannelData("Input data ends.") |
---|
[1495] | 620 | endinput = 1 |
---|
| 621 | elif fd == fromcfno : |
---|
| 622 | # We are no more interested in this file descriptor |
---|
[1562] | 623 | self.sendBackChannelData("Closing real backend's stdout+stderr.") |
---|
[1495] | 624 | os.close(fromcfno) |
---|
| 625 | endoutput = 1 |
---|
[1498] | 626 | else : |
---|
| 627 | self.logdebug("Unexpected : %s - Sleeping a bit..." % self.formatFileEvent(fd, mask)) |
---|
| 628 | time.sleep(0.01) |
---|
[1495] | 629 | |
---|
| 630 | if mask & select.POLLNVAL : |
---|
[1562] | 631 | self.sendBackChannelData("File %s was closed. Unregistering from polling object." % fd) |
---|
[1495] | 632 | self.unregisterFileNo(pollster, fd) |
---|
| 633 | except IOError, msg : |
---|
| 634 | self.logdebug("Got an IOError : %s" % msg) # we got signalled during an I/O |
---|
[1191] | 635 | |
---|
[1494] | 636 | # We must close the real backend's input stream |
---|
| 637 | if killed and not inputclosed : |
---|
[1562] | 638 | self.sendBackChannelData("Forcing close of real backend's stdin.") |
---|
[1494] | 639 | os.close(tocfno) |
---|
| 640 | |
---|
[1562] | 641 | self.sendBackChannelData("Exiting streams polling loop...") |
---|
[1492] | 642 | |
---|
[1494] | 643 | # Check exit code of original CUPS backend. |
---|
| 644 | if status == -1 : |
---|
| 645 | # we exited the loop before the real backend exited |
---|
| 646 | # now we have to wait for it to finish and get its status |
---|
[1562] | 647 | self.sendBackChannelData("Waiting for real backend to exit...") |
---|
[1494] | 648 | try : |
---|
| 649 | status = subprocess.wait() |
---|
| 650 | except OSError : # already dead |
---|
| 651 | status = 0 |
---|
[1222] | 652 | if os.WIFEXITED(status) : |
---|
| 653 | retcode = os.WEXITSTATUS(status) |
---|
[1291] | 654 | elif not killed : |
---|
[1584] | 655 | self.printInfo(_("CUPS backend %s died abnormally.") % realbackend, "error") |
---|
[1222] | 656 | retcode = -1 |
---|
[1291] | 657 | else : |
---|
| 658 | retcode = self.removeJob() |
---|
[1271] | 659 | return retcode |
---|
[1222] | 660 | |
---|
[1177] | 661 | if __name__ == "__main__" : |
---|
| 662 | # This is a CUPS backend, we should act and die like a CUPS backend |
---|
[1542] | 663 | retcode = 0 |
---|
[1177] | 664 | if len(sys.argv) == 1 : |
---|
[1178] | 665 | # we will execute each existing backend in device enumeration mode |
---|
| 666 | # and generate their PyKota accounting counterpart |
---|
| 667 | (directory, myname) = os.path.split(sys.argv[0]) |
---|
| 668 | 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)] : |
---|
| 669 | answer = os.popen(backend, "r") |
---|
| 670 | try : |
---|
| 671 | devices = [line.strip() for line in answer.readlines()] |
---|
| 672 | except : |
---|
| 673 | devices = [] |
---|
| 674 | status = answer.close() |
---|
| 675 | if status is None : |
---|
| 676 | for d in devices : |
---|
[1180] | 677 | # each line is of the form : 'xxxx xxxx "xxxx xxx" "xxxx xxx"' |
---|
| 678 | # so we have to decompose it carefully |
---|
[1178] | 679 | fdevice = cStringIO.StringIO("%s" % d) |
---|
| 680 | tokenizer = shlex.shlex(fdevice) |
---|
| 681 | tokenizer.wordchars = tokenizer.wordchars + r".:,?!~/\_$*-+={}[]()#" |
---|
| 682 | arguments = [] |
---|
| 683 | while 1 : |
---|
| 684 | token = tokenizer.get_token() |
---|
| 685 | if token : |
---|
| 686 | arguments.append(token) |
---|
| 687 | else : |
---|
| 688 | break |
---|
| 689 | fdevice.close() |
---|
[1180] | 690 | try : |
---|
| 691 | (devicetype, device, name, fullname) = arguments |
---|
| 692 | except ValueError : |
---|
| 693 | pass # ignore this 'bizarre' device |
---|
| 694 | else : |
---|
| 695 | if name.startswith('"') and name.endswith('"') : |
---|
| 696 | name = name[1:-1] |
---|
| 697 | if fullname.startswith('"') and fullname.endswith('"') : |
---|
| 698 | fullname = fullname[1:-1] |
---|
[1191] | 699 | print '%s cupspykota:%s "PyKota+%s" "PyKota managed %s"' % (devicetype, device, name, fullname) |
---|
[1542] | 700 | retcode = 0 |
---|
[1177] | 701 | elif len(sys.argv) not in (6, 7) : |
---|
| 702 | sys.stderr.write("ERROR: %s job-id user title copies options [file]\n" % sys.argv[0]) |
---|
| 703 | retcode = 1 |
---|
| 704 | else : |
---|
| 705 | try : |
---|
[1542] | 706 | try : |
---|
| 707 | # Initializes the backend |
---|
| 708 | kotabackend = PyKotaBackend() |
---|
| 709 | except SystemExit : |
---|
| 710 | retcode = -1 |
---|
| 711 | except : |
---|
| 712 | crashed("cupspykota backend initialization failed") |
---|
| 713 | retcode = 1 |
---|
| 714 | else : |
---|
| 715 | retcode = kotabackend.mainWork() |
---|
| 716 | kotabackend.storage.close() |
---|
| 717 | kotabackend.closeJobDataStream() |
---|
[1513] | 718 | except : |
---|
[1517] | 719 | try : |
---|
| 720 | kotabackend.crashed("cupspykota backend failed") |
---|
| 721 | except : |
---|
[1542] | 722 | crashed("cupspykota backend failed") |
---|
| 723 | retcode = 1 |
---|
[1177] | 724 | |
---|
| 725 | sys.exit(retcode) |
---|