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1# $Id$
2
3PyKota - Print Quota for CUPS
4
5(c) 2003-2004 Jerome Alet <alet@librelogiciel.com>
6This program is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 2 of the License, or
9(at your option) any later version.
10
11This program is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with this program; if not, write to the Free Software
18Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
19
20============================================================
21
22PyKota NEWS :
23
24    - 1.19alpha20 :
25   
26        - More complete logging messages wrt accounters.
27       
28        - Now catches early failures occuring when the configuration
29          files are parsed.
30       
31    - 1.19alpha19 :
32   
33        - Fixed over-verbose exits when displaying help
34          or version.
35         
36        - Extended some PATH in the shell scripts 
37       
38        - Deleting an user now also deletes his payments history.
39       
40        - Doesn't explicitely ignore SIGCHLD anymore. This seems to
41          cause problems.
42
43    - 1.19alpha18 :
44   
45        - History of payments is now stored in the database, and
46          updated each time an user's balance is modified with
47          edpykota --balance. This history represents each time
48          the user was given some positive or negative credit,
49          but doesn't reflect price paid for jobs, which appear
50          in the jobs history instead.
51         
52        - Jobs history web reports now include the job's size in
53          bytes. Also columns were reordered to render the report
54          more easily readable.
55         
56    - 1.19alpha17 :
57   
58        - Mysterious bug (program exited unexpectedly without leaving
59          any log message) which occured once in a while when
60          cancelling jobs should be fixed now.
61         
62        - New 'crashrecipient' directive. Disabled by 
63          default. See sample configuration file to see how
64          to activate it. It is suggested that you activate it.
65         
66        - New PYKOTAJOBSIZEBYTES environment variable exported, 
67          which contains the job's size in bytes. Empty jobs
68          are now denied. This value is now stored in the job
69          history (but not yet displayed from the web interface)
70         
71        - Preliminary work on payments storage : the PostgreSQL 
72          and LDAP schemas should be OK now, but no code is written
73          yet to support this functionnality.
74         
75    - 1.19alpha16 :
76   
77        - the newuser and newgroup LDAP specific directives now accept
78          a second parameter to attach(), "fail" or "warn". If no entry
79          is found to attach PyKota attributes to, and "fail" was used,
80          then action is aborted and program exits in error. If "warn"
81          is used, a new entry is created but a warning message is logged.
82         
83        - The job's originating hostname is now stored in the database,
84          and exported as PYKOTAJOBORIGINATINGHOSTNAME in the environment.
85       
86    - 1.19alpha15 :
87   
88        - The old pykota filter is now removed. This means that
89          currently PyKota doesn't support LPRng anymore, but
90          LPRng support will be re-added, improved, in the near future.
91         
92    - 1.19alpha14 :
93   
94        - PYKOTAPRECOMPUTEDJOBSIZE and PYKOTAPRECOMPUTEDJOBPRICE
95          are now exported as environment variables.
96         
97        - Heavy CPU usage is now completely fixed it seems, by
98          introducing some 0.01 second sleeping when nothing to do.
99         
100        - Pre-computation of the job's size is now only
101          done when enforcement is "STRICT", this saves
102          CPU for people who don't want to use this new
103          feature.
104         
105        - New 'enforcement' directive which accepts either
106          STRICT or LAXIST. See sample configuration file
107          for details.
108         
109    - 1.19alpha13 :
110   
111        - Get back to an old version of the polling loop which
112          worked fine, but non-optimally. Will be optimized
113          as time permits.
114         
115    - 1.19alpha12 :
116   
117        - Job's size is now precomputed unconditionnally using
118          the generic PDL analyzer.
119          NB : This value is not yet used to pre-allow/deny the
120          job.
121       
122    - 1.19alpha11 :
123   
124        - The pykota filter is now completely deprecated and
125          can't be used anymore. LPRng users MUST download
126          an older version of PyKota. CUPS users MUST use
127          cupspykota. Better support for LPRng will come
128          in the near future.
129         
130    - 1.19alpha10 :
131   
132        - pykotme now uses generic PDL Analyzer directly instead
133          of spawning a new process.
134         
135        - Improvements to generic PDL Analyzer.
136       
137        - 25% Speedup in PCL parser. Getting more of the Python version
138          will probably be difficult, since the completely table driven
139          parser I wrote is slower than the original algorithm. Then,
140          the original algorithm is still used for now.
141          Probable that more speed could be achieved using mmap, at the
142          expense of severe memory consumption.
143       
144        - configuration simplifications : the "accounter" directive's
145          'hardware' arguments now accepts what was in the "requester"
146          directive as it's content. The "requester" directive is not
147          supported anymore. See sample configuration file for details.
148       
149    - 1.19alpha9 :
150       
151        - pkpgcounter is now just a wrapper around the PDLAnalyzer class
152       
153        - pykotaOptions LDAP attribute now accepts non-ascii characters
154          too.
155         
156        - First try at cupspykota main loop rewrite
157       
158    - 1.19alpha8 :
159   
160        - 'querying' accounting method is now called 'hardware'
161       
162        - 'external' accounting method is now called 'software'
163       
164        - 'stupid' accounting method doesn't exist anymore
165       
166        - 'snmp' requester doesn't exist anymore
167       
168        - code simplifications in external requester
169       
170    - 1.19alpha7 :
171     
172        - Database schema change (both LDAP and PostgreSQL) to
173          allow storage of the job-originating-hostname attribute.
174          An SQL upgrade script is present. The code is not yet
175          capable of setting/retrieving this attribute. Support
176          for this functionnality will be added in the future.
177         
178    - 1.19alpha6 :
179   
180        - problems connecting to SMTP servers are now catched.
181       
182        - pykotme now uses pkpgcounter to compute the size of the
183          job. This modification adds PCL5 and soon PCLXL (PCL6)
184          support. You can now get quotes for PCL in addition to
185          PostScript.
186         
187        - pkpgcounter now includes first try at PCLXL parser. 
188          It is currently disabled until it's finished.
189         
190    - 1.19alpha5 :
191   
192        - cupspykota polling loop fix for MacOSX (at least)
193       
194        - logging subsystem now logs PID too, to ease diagnosing
195          problems under heavy load.
196         
197        - pkpgcounter enhancements.
198       
199        - pkprinters --skipexisting now tells pkprinters to not
200          modify existing printers when --add is used.
201          pkprinters logs a warning message whenever --add is
202          used and a printer already exists.
203         
204        - LDAP schema now allows accented chars in pykotaFileName
205          and pykotaTitle attributes.
206       
207    - 1.19alpha4 :
208   
209        - a bad copy&paste prevented pkpgcounter to work at all, this
210          is now fixed.
211         
212        - improved PCL support in pkpgcounter, with the use of
213          HP PCL/PJL Reference Set
214          PCL5 Printer Language Technical Quick Reference Guide
215       
216        - pkpgcounter now uses mmap to speed things up : duration
217          is halved with the sample 87 pages PCL document I use for
218          testing.
219         
220    - 1.19alpha3 :
221   
222        - pkprinters now accepts the --list command line argument
223          to list informations about printers.
224         
225    - 1.19alpha2 :
226   
227        - pkpgcounter is now included as a smart external
228          accounter which can handle both PostScript and PCL.
229         
230    - 1.19alpha1 :
231   
232        - PYKOTALIMITBY environment variable is now exported too.
233       
234        - Inclusion of Michele Baldessari's work on autotools.
235       
236    - 1.18 :
237   
238        - Improved documentation
239       
240    - 1.18beta2 :
241     
242        - Fix for raw jobs with cupspykota
243       
244    - 1.18beta :
245   
246        - Small fix for new waitprinter.sh script
247       
248        - Better tracebacks on error conditions
249       
250        - Improved translations
251       
252        - Improved documentation
253       
254    - 1.18alpha15 :
255
256        - waitprinter.sh replaced by a new and possibly faster
257          and more powerful one.
258   
259        - Names can now begin with a digit.
260       
261        - Stability improvement for quotas set on printers groups.
262       
263    - 1.18alpha14 :
264   
265        - Catches more (all ?) problems with SMTP servers instead
266          of breaking.
267         
268        - Italian translation added.
269       
270    - 1.18alpha13 :
271   
272        - Pre and Post hooks are now available in the pykota
273          filter as well.
274         
275        - The pykota filter doesn't check last user's quota
276          anymore when delayed hardware accounting is used :
277          this will be done anyway the next time the last
278          user will print again. This saves some database
279          queries which are unneeded.
280       
281    - 1.18alpha12 :
282   
283        - Pre and Post hooks to external commands with many
284          many environment variables available are useable
285          from the cupspykota backend.
286          See sample configuration file for details and help.
287         
288    - 1.18alpha11 :
289   
290        - Hopefully final fix wrt groups (users and printers)
291       
292    - 1.18alpha10 :
293   
294        - Fixed nested printer groups accounting.
295       
296        - Fixed user groups + printer groups problem.
297       
298    - 1.18alpha9 :
299   
300        - Fix for LDAP problem when job price was 0.
301       
302        - Fix for empty user groups with LDAP.
303       
304        - Preliminary version of the snmpprinterstatus command added.
305       
306    - 1.18alpha8 :
307   
308        - Don't retrieve data when not needed.
309          This avoids many database queries.
310       
311    - 1.18alpha7 :
312   
313        - New experimental ldapcache directive to improve
314          LDAP caching.
315         
316    - 1.18alpha6 :
317       
318        - New configuration directive added : maildomain
319          to specify the domain to send mail to when user
320          email address is not set in PyKota database.
321         
322        - More complete email message headers. 
323         
324    - 1.18alpha5 :
325   
326        - Debian packaging specific files, contributed by
327          Peter Hawkins are now included in the project's tree.
328         
329        - Preliminary work on future low-level LDAP caching to speed
330          up modifications (at least).
331         
332    - 1.18alpha4 :
333   
334        - Applied some of the modifications suggested by
335          Peter Hawkins, for better Debian integration.
336          Most notably cupspykota, pykota, and the shell
337          scripts are now installed into /usr/share/pykota
338          instead of into /usr/bin
339          BEWARE : double check that your symbolic link
340          to cupspykota is correct, and that your pykota.conf
341          file use correct path for the shell scripts like
342          waitprinter.sh and al.
343         
344        - pkhint command added, to help in configuring correct
345          accounting method for PyKota.
346         
347    - 1.18alpha3 :
348   
349        - Fixed a rare bug in cupspykota backend which gave
350          incorrect "CUPS backend died abnormally" messages.
351       
352    - 1.18alpha2 :
353   
354        - Added the pkprinters command line tool to manage printers
355          exclusively.
356       
357    - 1.18alpha1 :
358   
359        - Preliminary work on Relationnal Database Independance.
360       
361        - Sample report made from OpenOffice.org added as PDF and SXC.
362       
363    - 1.17 :
364   
365        - Finalized release.
366       
367    - 1.17alpha2 :
368   
369        - Fix stupid software accounting bug in the CUPS backend.
370       
371    - 1.17alpha1 :
372   
373        - User/Group deletion code in edpykota rewritten.
374       
375    - 1.16 :
376   
377        - Preliminary documentation on how to use OpenOffice.org
378          to create personnalized reports for PyKota + PostgreSQL.
379         
380        - Spanish installation guide for CUPS+PyKota+PostgreSQL
381          added to the documentation. Doesn't yet document v1.16
382          though.
383       
384        - Portuguese Portuguese translation replaces Brasilian
385          Portuguese Translation. Brasilian portuguese
386          translation is still available under the 'br' locale.
387       
388    - 1.16beta3 :
389   
390        - Swedish translation added.
391       
392        - Small fix in documentation.
393       
394    - 1.16beta2 :
395   
396        - Small fix for job cancelling code while job already
397          printing in CUPS backend.
398         
399        - Big fix wrt printing policies for unknown users. 
400       
401    - 1.16beta1 :
402   
403        - Manpages upgraded.
404       
405    - 1.16alpha26 :
406   
407        - Job price is now computed like this :
408       
409          SUM((NbPages * PricePerPage) + PricePerJob)
410         
411          For current printer and all the printers groups it is
412          a member of, if any.
413         
414          This may be difficult to grasp, but offers unprecedented
415          flexibility.
416         
417    - 1.16alpha25 :
418   
419        - Email address can be set at user creation time,
420          using the following syntax :
421         
422            $ edpykota --add username/email@yourdomain.com
423       
424    - 1.16alpha24 :
425   
426        - CGI script now can show the printing history.
427       
428        - Bug wrt number of copies should be fixed.
429       
430        - Major code refactoring => It is now possible to
431          automatically add printers on first print.
432       
433    - 1.16alpha23 :
434   
435        - Fixed potential accuracy problem if a user printed on
436          several printers at the very same time.
437       
438    - 1.16alpha22 :
439   
440        - edpykota now allows adding printers to printer groups
441       
442    - 1.16alpha21 :
443   
444        - Allows the dot in user and printer names.
445       
446        - Printer groups are now cached too.
447       
448    - 1.16alpha20 :
449   
450        - Fixed several small bugs with the help of PyChecker.
451       
452    - 1.16alpha19 :
453     
454        - Fixed a bug in PostgreSQL backend's code.
455       
456    - 1.16alpha18 :
457   
458        - Initial code for printer groups support. Printer groups have
459          to be added with external tools like psql or gq for example.
460          Printer groups seems to work fine with users. Untested with user
461          groups for now.
462
463        - Several minor visual problems fixed in reports.
464       
465        - Fixed a bug in LDAP date handling.
466       
467        - Fix for LDAP problem with some combination of OpenLDAP + Python-LDAP
468          + some particular settings.
469         
470        - mailandpopup.sh shell script added. See sample configuration file
471          for details.
472       
473        - Several environment variables are now exported when executing
474          external commands (accounters, requesters, mailers) :
475           
476            PYKOTAUSERNAME => user who is printing
477            PYKOTAPRINTERNAME => printer on which the job is being sent
478            PYKOTATITLE => Job's title
479            PYKOTAFILENAME => Job's filename
480            PYKOTACOPIES => number of copies asked
481            PYKOTAOPTIONS => print command options (-o with CUPS)
482         
483    - 1.16alpha17 :
484   
485        - Added portugues translation.
486       
487        - Major code refactoring in accounters.
488       
489    - 1.16alpha16 :
490   
491        - Code refactoring, and addition of a real HTML reporter, to
492          have nice looking and useful web based reports (in the future).
493       
494        - Added utolower configuration option to convert all usernames
495          to lowercase during printing.
496         
497    - 1.15alpha15 :
498   
499        - Now includes the papwaitprinter.sh shell script to wait for
500          AppleTalk enabled printers.
501         
502    - 1.16alpha14 :
503   
504        - Now printing on a printer not defined in the Quota Storage,
505          results in the job being cancelled or stopped, depending
506          on the printing system.
507         
508    - 1.16alpha13 :
509   
510        - Small bugfix wrt Python v2.1
511       
512        - If username is an empty string, user root is assumed.
513       
514        - 'postgresql' is not recognized anymore as a storage backend,
515          you have to use 'pgstorage' instead. 'postgresql' used to
516          be supported for compatibility with very old PyKota versions,
517          this is not the case anymore.
518         
519    - 1.16alpha12 :
520   
521        - Job price added to job history, to keep accounting correct
522          if a printer price per page or per job is modified and the
523          history is not reset : the history would have given a false
524          amount of money charged before the printer's prices were
525          modified, this addition solves the problem.
526         
527    - 1.16alpha11 :
528   
529        - Some preliminary modifications to the database structure for
530          PostgreSQL and OpenLDAP. A script to upgrade a PostgreSQL
531          database is now provided. LDAP attributes now support
532          eq, pres and sub indexes.
533         
534        - Job history now contains additional informations : 
535          number of copies, filename, title and print options.
536         
537    - 1.16alpha10 :
538       
539        - Some modifications done to external policy handling.
540          See sample configuration file for details.
541   
542        - Spanish translation added.
543       
544    - 1.16alpha9 :
545   
546        - mailto can be set to external(...) to warn users above
547          quota with any command of your choice (e.g. linpopup).
548          Several parameters are available, see sample configuration
549          file for details.
550         
551    - 1.16alpha8 :
552   
553        - Now cupspykota transmits SIGTERMS to the original 
554          backend when the user deletes a job being processed.
555         
556        - The documentation is now licensed under the terms of the
557          GNU GPL too.
558         
559    - 1.16alpha7 :
560   
561        - The CUPS backend is now fully functionnal (it seems).
562       
563        - From now on, the use of the pykota filter with CUPS
564          is deprecated. The pykota filter still has to be
565          used with LPRng though.
566       
567    - 1.16alpha6 :
568   
569        - Bug fixed : when edpykota was used to add a printer
570          with no user or group name, a bad user/group name "*" was
571          added to the database.
572         
573    - 1.16alpha5 :
574   
575        - New CUPS backend supports device enumeration !
576          This means that NO manual CUPS configuration has to
577          be done. All can now be done from CUPS web interface.
578       
579    - 1.16alpha4 :
580   
581        - New CUPS backend added.
582       
583    - 1.16alpha3 :
584       
585        - Minimal FAQ document added.
586       
587    - 1.16alpha2 :
588   
589        - CGI script now partially supports browser's language preference
590       
591    - 1.16alpha1 :
592   
593        - Ensures that the LDAP connection is really closed at end.
594       
595        - More complete error messages in case of LDAP operation failure.
596       
597    - 1.15 :
598     
599        - Documentation improved.
600       
601    - 1.15beta :
602   
603        - Command line tools now accept multiple printer
604          names or wildcards, separated with commas.
605         
606    - 1.15alpha9 :
607   
608        - External policy can be used to auto-add unknown users
609          and any other interesting things you may want to do.
610          WARNING : You can't auto-add printers for now.
611          They have to be created manually before.
612          Look at sample configuration file for examples.
613         
614    - 1.15alpha8 :
615   
616        - Job history can be disabled if needed.
617          This feature may be useful for people who use the LDAP
618          backend and don't want their LDAP tree to grow out of
619          control.
620       
621    - 1.15alpha7 :
622   
623        - More work done on caching wrt groups.
624       
625    - 1.15alpha6 :
626   
627        - Performance bottleneck with LDAP solved.
628       
629    - 1.15alpha5 :
630   
631        - Caching mechanism for all database queries.
632
633    - 1.15alpha4 :
634   
635        - Problem with Python 2.3 fixed. Needs some definitive
636          modification.
637         
638    - 1.15alpha3 :
639   
640        - CGI script now tries to restrict view when the
641          REMOTE_USER environment variable is set. This allows
642          people to protect its use with .htaccess files.
643          When unprotected, or if REMOTE_USER is 'root', then
644          unrestricted access is granted.
645          NB : REMOTE_USER is automatically set by the web server
646          (e.g. Apache) when a page with restricted access is viewed.
647         
648    - 1.15alpha2 :
649   
650        - Better detection of LPRng.
651       
652        - Outputs a warning if printing system is unknown.
653       
654    - 1.15alpha1 :
655   
656        - Bug fix in SQL code.
657       
658    - 1.14 :
659   
660        - The PostgreSQL database connection is now always closed before
661          exit. The LDAP database connection too, but it didn't suffer
662          from the problem anyway, AFAICT.
663       
664    - 1.14beta2 :
665   
666        - An LDAP-specific configuration field was introduced, usermail.
667          Use it to specify which LDAP attribute contains a valid email
668          address for the user. See sample configuration file for
669          details.
670       
671    - 1.14beta :
672   
673        - Two new LDAP-specific configuration fields were introduced,
674          newuser and newgroup. Use them to specify if you want to add
675          quota information to existing entries or elsewhere.
676          See sample configuration file for details.
677         
678    - 1.14alpha9 :
679   
680        - Documentation improved.
681       
682        - pykotme now also prints the user's account balance value
683          if the user is registered in the Quota Storage and his
684          limiting factor is "balance".
685         
686    - 1.14alpha8 :
687   
688        - bin/waitprinter.sh is now included to wait for
689          SNMP enabled printers to be idle again before
690          asking for their internal page counter.
691          See sample configuration file for details.
692         
693    - 1.14alpha7 :
694   
695        - edpykota now doesn't check if the user/group is above
696          quota. The check is only done at print time. This
697          prevents the sending of email messages when creating
698          user quotas if quota is already reached at creation
699          time.
700         
701    - 1.14alpha6 :
702   
703        - Configuration file split and moved to /etc/pykota/pykota.conf
704          and /etc/pykota/pykotadmin.conf to prevent simple users to
705          have Read/Write access to the Quota Database.
706          Don't forget to :
707         
708                $ chmod 640 /etc/pykota/pykotadmin.conf
709               
710        - storageuser and storageuserpw configuration fields reintroduced
711          for the same reason.
712         
713        - Code cleaning for future implementation of email addresses
714          support in the PostgreSQL and LDAP backends.
715         
716    - 1.14alpha5 :
717       
718        - Big bug fixed when changing the prices for a printer
719       
720    - 1.14alpha4 :
721   
722        - When adding an user, the user itself and its account balance
723          are now added in the same LDAP entry. Before they were added
724          as two different LDAP entries.
725         
726    - 1.14alpha3 :
727   
728        - Email field added to PostgreSQL database. An upgrade script
729          is included in initscripts/postgresql.
730       
731    - 1.14alpha2 :
732   
733        - Typo fixed when using the --prototype option to edpykota
734       
735    - 1.14alpha1 :
736   
737        - Poor man's treshold included : users with a low account
738          balance (below 1.0 by default, configurable) are sent
739          a warning message.
740         
741        - All warning messages to users are now configurable. 
742          NB : Warning messages to the administrator are not.
743       
744    - 1.13 :
745   
746        - Some small fixes wrt group handling.
747       
748        - The whole module code was passed through PyChecker and
749          several small code inconsistencies were fixed,
750          as well as a bug in the groups code.
751         
752    - 1.13alpha1 :
753   
754        - Bug fix wrt LDAP.
755       
756    - 1.12 :
757   
758        - More complete test added in edpykota.
759       
760    - 1.12alpha2 :
761   
762        - The previous bug fix was incomplete. This is corrected.
763       
764    - 1.12alpha1 :
765   
766        - Small bug fix.
767       
768    - 1.11 :
769   
770        - Now includes the pykotme command line tool, to produce
771          printing quotes for users.
772         
773    - 1.10 :
774   
775        - Bug fixed wrt quota reports when print limiting is by
776          account balance.
777         
778    - 1.09 :
779   
780        - Translations finalized.
781       
782        - Manpages updated.
783       
784        - Installation documentation improved wrt LDAP support.
785       
786    - 1.09beta2 :
787   
788        - The CGI script for quota reports works again, and
789          is much more powerful.
790       
791    - 1.09beta :
792   
793        - edpykota finalized
794       
795    - 1.09alpha2 :
796   
797        - LDAP schema modified a bit. Please upgrade.
798       
799        - LDAP backend works !
800       
801        - repykota and warnpykota allow the root user to pass
802          users or groups names on the command line. Users
803          and groups names may contain wildcards.
804         
805        - repykota and warnpykota only reports or warns the
806          current user when launched by non-root users.
807         
808        - Minor bug fixes. 
809   
810    - 1.09alpha1 :
811   
812        - More work on LDAP storage backend. Many options
813          were added to /etc/pykota.conf to give some
814          hints to the LDAP storage backend.
815         
816        - Severe database access optimizations were done by
817          rewriting most of the Quota Storage backends drivers.
818     
819    - 1.08 :
820   
821        - Major bug fix wrt LPRng support for remote jobs.
822       
823        - Major bug fix wrt increase/decrease account balances.
824       
825    - 1.08alpha8 :
826   
827        - Code refactoring.
828       
829        - A single user/password pair is used to connect
830          to the database backend. The storageuser configuration
831          field, and its associated passwords storageuserpw, are
832          not used anymore.
833         
834        - You can now set PyKota in debug mode, see sample configuration 
835          file for details.
836          WARNING : only Quota Storage backend queries are logged in
837          debug mode, for now.
838       
839    - 1.08alpha7 :
840   
841        - Very latest LDAP schema.
842       
843        - Code enhancement wrt easy pluggability of PyKota attributes
844          and object classes into an existing LDAP directory.
845       
846    - 1.08alpha6 :
847   
848        - Minor bug corrections
849       
850        - More work on LDAP : new schema
851       
852    - 1.08alpha5 :
853   
854        - More good work on LDAP storage.
855          repykota now works reasonably well with the sample LDAP directory.
856       
857    - 1.08alpha4 :
858   
859        - LDAP schema included.
860          THIS IS JUST FOR PEOPLE TO DISCUSS ABOUT THIS.
861          LDAP SUPPORT DOESN'T WORK YET, AND THE SCHEMA
862          MAY CHANGE IN THE FUTURE. PLEASE TELL US
863          WHAT YOU THINK ABOUT THIS SCHEMA ON THE
864          MAILING LIST.
865         
866    - 1.08alpha3 :
867   
868        - External accounting methods were partly rewritten :
869         
870          - No more "broken pipe" should happen.
871         
872          - They now take care of the number of copies
873            This may be unneeded though, if the postscript
874            file already does this, because this would
875            overcharge users (number of copies counted
876            two times). NEEDS MORE TESTING.
877           
878          - The sample configuration file now contains 
879            an external accounting method example which should
880            work with all DSC compliant Postscript files.
881           
882        - Some small bugs were fixed.   
883       
884    - 1.08alpha2 :
885   
886        - Now works with net-snmp v5.0 and above.
887          It already worked, but the sample configuration
888          file didn't contain appropriate values...
889       
890    - 1.07 : Release of the Shame !
891   
892        - The external accounting methods driver was left out of
893          the CVS tree. Nobody could use it since it wasn't included !
894         
895    - 1.06 :
896   
897        - Severe bug fixed : if you had a printer in
898          power saving state which couldn't answer immediately,
899          a bug was triggered.
900          It was caused by a bad copy/paste which
901          forgot to import a Python module at run time.
902         
903    - 1.05 :
904   
905        - External accounters are finally available !
906          This means that you can plug any page accounting
907          method you like by setting the appropriate
908          'accounter' field in /etc/pykota.conf
909          See the sample conf/pykota.conf.sample to
910          learn how to do.
911         
912          NB : Both 'external' and 'stupid' accounting methods
913               account a job size just before *this* job is
914               sent to the printer.
915               The original 'querying' method accounts a job
916               size just before *the next* job is sent to
917               the printer.
918       
919    - 1.05alpha3 :
920   
921        - A 'stupid' and unreliable accounting method was
922          implemented to serve as an example on how to
923          do this sort of things. This method only counts
924          the 'showpage' statements in the input data.
925          See sample configuration file for details.
926          Pluggable accounting methods work, but I advise
927          you TO NOT USE THIS ONE WHICH IS JUST AN EXAMPLE.
928          It is not reliable enough to be used.
929          Use the 'querying' accounting method instead.
930         
931    - 1.05alpha2 :
932   
933        - Pluggable accounting methods.
934       
935        - Better error handling.
936       
937    - 1.05alpha1 :
938   
939        - SECURITY file added to help improve PyKota's security.
940       
941        - Extracting the printer's internal page counter is now
942          tried several times, waiting several seconds between
943          two tries. This lets the time to warm up for some printers
944          which don't answer when they are sleeping (my Apple
945          LaserWriter 16/600 PS is in this case, maybe others too)
946         
947        - Small display bug fixed in repykota
948         
949    - 1.04 :
950   
951        - Default print policy for users/groups unknown from
952          the print quota system is now DENY instead of ALLOW,
953          since ALLOW can generate inaccurate results
954          (incorrect job sizes charged to the wrong persons)
955         
956        - LPRng support works !
957       
958        - A bug was introduced some time ago wrt printers' default
959          policy for unknown users. It is now corrected.
960       
961        - repykota now displays prices per job and per page for each
962          printer, if they are defined.
963         
964        - Minor display bug fixed in repykota.
965       
966        - Problem when running repykota with an empty database was fixed.
967       
968    - 1.03 :
969   
970        - Upgrade script included for earlier versions.
971          Please look inside the initscripts subdirectory.
972          THE DATABASE SCHEMA HAS CHANGED, PLEASE UPGRADE.
973         
974        - repykota now reports account balances too.
975       
976        - PyKota now has a nice logo, see the logos
977          subdirectory.
978       
979        - Manual pages were finally updated.
980       
981        - Group quotas seem to work now !
982       
983        - The new database schema allows to keep an history of all
984          jobs as well as charge users per page and/or per job,
985          and track users' account balance.
986         
987        - edpykota now accepts much more command line options to 
988          use the new functionnalities. See edpykota --help for
989          details.
990         
991        - The installation script now allows to install the sample
992          configuration file during first installation.
993         
994        - More group quota code works, but still not finished. 
995       
996        - The CGI script displays a link to PyKota's website.
997       
998        - The job history is now kept, this will allow per-period
999          reports in the future.
1000         
1001        - After having modified the quota for an user with edpykota,
1002          a quota check is done to eventually warn the user/admin about
1003          a quota which is too low to print.
1004         
1005        - A workaround is provided for HP Printers : their internal
1006          page counter is only saved to NVRAM in a 10 increment, so
1007          if you switch them off and then on, the reported page counter
1008          may be lower than the real number of pages printed.
1009          See http://web.mit.edu/source/third/lprng/doc/LPRng-HOWTO-15.html
1010          We unconditionnally set the last job's page count to
1011          abs(int((10 - abs(lastcounter(snmp) - lastcounter(storage)) / 2))
1012          in this case.
1013          For a more accurate accounting, never switch your HP printers
1014          off.
1015         
1016        - A fix is provided for printers which only have a volatile 
1017          page counter (reset to 0 every time you switch the printer on)
1018          This should allow PyKota to work reasonably fine with HP Laserjet
1019          4L/5L/6L, not perfect, but better than nothing.
1020          See http://web.mit.edu/source/third/lprng/doc/LPRng-HOWTO-15.html
1021          For a more accurate accounting, never switch your HP printers
1022          off. This is untested, please report any problem.
1023         
1024        - A bug was fixed when edpykota --add was used with users who already
1025          had a quota on the specified printer.
1026         
1027        - A small display bug in repykota was introduced in preliminary
1028          1.03 versions, and fixed later on.
1029         
1030        - Some minor bugs which happened in rare situations were fixed.
1031       
1032        - Support for AppleTalk printers was added, see sample configuration
1033          file for details.
1034         
1035        - Users and group printing can now be controlled (limited) either by 
1036          print quota or by account balance.
1037       
1038    - 1.02 :
1039   
1040        - The installation script now checks for software availability
1041          and in case a software is missing asks the user if he
1042          wants to continue with the installation or abort it.
1043         
1044        - The configuration file pykota.conf is now expected to be
1045          found in /etc instead of in /etc/cups
1046          The installation script prompts the user to see if he
1047          wants to move an old configuration file to the new location
1048          if needed.
1049         
1050        - Improved documentation.
1051       
1052        - You can now set the tcp/ip port on which the Quota Storage
1053          Server is listening, see sample configuration file for details.
1054       
1055        - Better general error handling.
1056       
1057        - Upgrade script for pre 1.01 PostgreSQL database schema is now
1058          included as well.
1059       
1060    - 1.01 :
1061   
1062        - The configuration file now accepts an option   
1063          to choose the recipient(s) of the email messages :
1064         
1065            - DevNull means no one will receive them.
1066            - User means only the user will receive them.
1067            - Admin means only the admin will receive them.
1068            - Both means the User and the Admin will receive them.
1069           
1070        - The configuration file now uses hard-coded default values
1071          when an option is not set. See sample configuration file
1072          for details.
1073         
1074        - Manual pages are included since 1.00, but I forgot to   
1075          add this information to this file.
1076         
1077        - Redistribution terms for the official package have 
1078          softened and are now fully GPL compatible :
1079          unrestricted modification is now allowed even for
1080          the version number.
1081         
1082    - 1.00 :
1083   
1084        - edpykota now accepts a --noquota option. This
1085          disable quota checking while still doing page
1086          accounting. This is really useful for people
1087          who don't want to limit their users but want
1088          to know how much pages they print.
1089         
1090        - Some untested scripts were added to retrieve
1091          the life time page counter of non-SNMP printers.
1092         
1093        - Every directory now has a specific README file. 
1094       
1095    - 0.99 :
1096   
1097        - Under some circumstances while the user wasn't allowed
1098          to print, he didn't receive any email message. It is
1099          now fixed.
1100         
1101        - When an user wasn't allowed to print, the quota for
1102          the previous user wasn't updated. This is now fixed.
1103         
1104    - 0.98 :
1105   
1106        - Correctly handle the case where the printer is switched off.
1107       
1108        - Small bug wrt syslog fixed.
1109       
1110    - 0.97 :
1111   
1112        - edpykota accepts wildcards on its command line for users/groups too
1113          if the --add option is not set, e.g. :
1114         
1115              $ edpykota --printer lp --softlimit 50 --hardlimit 100 "jer*"
1116             
1117        - If no user name is passed at all, then a default wildcard of "*"
1118          which means apply the command on ALL users for this printer is used.
1119         
1120        - Small bug fixes.
1121       
1122    - 0.96 :
1123
1124        - Options requester, policy, admin, adminmail and gracedelay can now
1125          be set either globally or per printer. The printer option has
1126          priority if both are defined.
1127
1128        - More powerful configuration parser.
1129       
1130        - If all options are defined globally, there's no need to
1131          define a section for each printer in the configuration
1132          file anymore. Just define a [global] section and it's ok.
1133
1134    - 0.95 :
1135
1136        - External requesters for printers finally added.
1137
1138        - Full internationalization (english and french are supported)
1139 
1140        - More complete quota usage report
1141
1142        - CGI script to access to the quota usage report
1143
1144        - Several bugs fixed.
1145
1146
1147    - 0.9 :
1148
1149        - First public version
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