Meeting called to order by Ira McDonald at 1pm US Eastern. Minutes taken by Ira McDonald.
Note: WebEx meeting failed entirely. Shifted eventually to Google Meet. Minutes reflect Till's OP News posted on 22 September 2022. Ira will acquire a new web conference provider before our 18 October 2022 next OP call.
Attendees
Agenda
- Progress report
- You remember Till's announcement of the HOWTO about running Printer Applications under
Windows via WSL to save legacy printers in the August News (see link above)?
- You were perhaps thinking about the poor Windows users whose printers stopped working
now having to compile a hell lot of libraries from our site to get their old treasure
working again. That is not needed any more. The new version of WSL supports systemd and
with this also snapd and with this Snaps, including all the Printer Application Snaps.
And systemd enables more Linux workflows you are used to in WSL, like auto-starting the
daemons (also of the Printer Applications). No compiling, auto-starting daemons, Avahi
advertising your printer to the hosting Windows (no manual input of the URI), ...
- See links above to the first announcement from Microsoft and the first Ubuntu blog from
Oliver Smith, Product Manager Enterprise Desktop at Canonical.
*** Update: Our HOWTO for Windows WSL Printing is now updated.
- See link above to the updated HOWTO.
- And here is quick overview of the changed steps (details in the HOWTO):
- First, use either the preview version of Ubuntu WSL or follow Oliver's instructions on
enabling systemd in your WSL. It is the section "How to enable systemd in Ubuntu WSL"
near the beginning of the blog.
- Now make sure you have Avahi installed (package avahi-daemon):
dpkg -l | grep avahi-daemon
- install Avahi if needed:
sudo apt install avahi-daemon
- With this the Windows print environment will auto-discover the Printer Application
running under WSL.
- If your printer is connected via USB, install USB IPD.
- Now find the suitable Printer Application in the Snap Store (OpenPrinting, LPrint) or if
you are in doubt, use our look-up service (see link above). Install it with just a simple:
sudo snap install <NAME>
- Replace <NAME> by the name of the Printer Application which you need for your printer.
- Now set up your printer inside the Printer Application using a web browser.
- Add the printer to Windows:
Go to "Settings" > "Bluetooth & devices" > "Printers & scanners" and hit "Add device"
button. You should find an entry for your printer provided by the Printer Application in
the list, with the name you have given to it when setting it up in the Printer
Application.
- Now you can print as you are used to under Windows.
- Thanks a lot to Serhat Toktamisoglu and his WSL team at Canonical, Didier Roche,
Jean-Baptiste Lallement, Carlos Nihelton, and Eduard Gomez Escandell and especially
Dani Llewellyn as community contributor for getting the systemd support into WSL in such
a short time!
- Thanks to the people at Microsoft cooperating with our team at Canonical on WSL!
- Thanks to Carlos Nihelton for working out the steps to run Printer Applications under
WSL, even already before the addition of systemd support!
- Thanks to Serhat Toktamisoglu for supporting Till on this project!
- And thanks to Oliver Smith for his great blog entry, being a HOWTO for getting started
with systemd-enabled WSL, and also spreading the news!
- Progress report
- We have another great Linux Plumbers Conference behind us, after 2 years of virtual-only
due to the pandemic finally in-person again! You are really missing something with virtual
conferences.
- Our OP micro-conference on was a success again! We discussed a lot on OpenPrinting's plans
for the next 12 months.
- Unfortunately there were some technical problems with the recording, so that it is not
ready right now. We will add OP News links as soon as we get it. Please stay tuned.
- Till Kamppeter, Piotr Pawliczek, Valentin Viennot, and Monica Ayhens-Madon were live on
stage, while Michael Sweet, Zdenek Dohnal, and Aveek Basu participated remotely.
- We had the following sessions:
* Introduction
Presenter: Till Kamppeter
Slides: https://lpc.events/event/16/contributions/1163/attachments/941/1856/openprinting-mc-introduction.pdf
* CUPS 2.5 and 3.0 Development
Presenter: Michael Sweet
Slides: https://lpc.events/event/16/contributions/1163/attachments/941/1849/lpc-cups-2022.pdf
Mostly, as reported here from earlier conferences. CUPS 2.5.x delayed to release in May
2023, 3.x stays in time for release end of 2023. There was no coding yet for 2.5.x and
2.5.x also needs OAUth integration with the desktop. Does not make sense when one cannot
use OAuth. No worries for switchover into New Architecture by CUPS 3.x or the CUPS Snap:
All free drivers are available in Printer Applications, GNOME Control Center and print
dialogd support available by then, rehearsal by Ubuntu with CUPS Snap.
* Testing and CI for OpenPrinting projects
Presenters: Michael Sweet, Till Kamppeter
Slides: https://lpc.events/event/16/contributions/1161/attachments/942/1851/lpc-printing-ci-2022.pdf
CUPS and some other projects do CI via Github Actions triggered on each GIT commit: make
test, static analysers, try to build Docker image,... We want to expand this to all
important OpenPrinting projects, in addition regression tests (from Red Hat), filter
regression tests on huge amount of print data files from bug report (like Ghostscript),
perhaps also private tests for CVEs.
* Restricting access to IPP printers with OAuth2 framework
Presenter: Piotr Pawliczek
Slides: https://lpc.events/event/16/contributions/1165/attachments/1093/2097/LPC2022_OAuth2_for_IPP.pdf
Desktop/GUI integration is required, best with OAuth2 support already existing in the
desktop toolkits and Linux distributions. Zdenek Dohnal has reached out to the upstream
developers of GTK/GNOME about the OAuth2 integration and already available components,
especially GNOME Online Accounts (GOA), evolution-data-server (eds), opening browser,
user/password input pop-ups, RestOAuth2Proxy from librest 1.0, liboauth,... We will post
here when we find our way through this.
* Documentation for OpenPrinting projects
Presenter: Till Kamppeter
Slides: CUPS https://lpc.events/event/16/contributions/1160/attachments/943/1853/lpc-printing-docs-2022.pdf
Slides: Site https://lpc.events/event/16/contributions/1160/attachments/943/1860/documentation-openprinting-extra.pdf
Documentation for programmers, administrators, and users needed, in CUPS the former is
mainly automated by especially formatted comments in the source code and extracting these
with an appropriate tool and the rest is written manually. We want to extend this to all
important OpenPrinting projects. In addition, we should also consolidate all printing
debugging documentation created by the distributions: Debian, Ubuntu, Fedora, SUSE,...
* Sandboxing/Containerizing alternatives to Snap for Printer Applications
Presenters: Till Kamppeter, Valentin Viennot
Slides: General https://lpc.events/event/16/contributions/1164/attachments/944/2160/containerization-cups-printer-applications-intro.pdf
Slides: Chiselled Containers https://lpc.events/event/16/contributions/1164/attachments/944/1881/linux-plumbers-valentin-viennot.pdf
Only containerization alternative to Snap is OCI-compliant containers: Docker, ROCKs,...
For this session Till had invited Valentin Viennot, Product Manager ROCKs & Container
Images at Canonical, as a last-minute guest to talk about optimizing containers for
security and size by removing (chiselling) unnecessary OS components. Valentin would help
us on this for containers of CUPS and of Printer Applications, both in OCI-compliant and
Snap format and to distribute via the ROCKs store.
- We did cancel the 3D-printing session since we did not have enough to discuss about this
subject.
- Phoronix has written about Mike's part on our micro-conference:
CUPS 3.0 Continues Being Crafted To Overhaul Linux Printing
https://www.phoronix.com/news/CUPS-3.0-Architecture-Overhaul
(note that many of the reply comments subsequently posted were wildly inaccurate)
- Thanks a lot to Monica Ayhens-Madon for taking care of the remote attendees while Till
was concentrating on the people in the room, to Steven Rostedt and James Bottomley for
organizing the Linux Plumbers and helping Till with everything micro-conference-related,
especially also having given last-minute in-person admission to Valentin, and also thanks
to Zdenek Dohnal for taking notes on the OP micro-conference discussions.
- Progress report
- Once in Dublin for the Linux Plumbers (see above) Till also attended this year's Open
Source Summit Europe of the Linux Foundation. This is one of the largest free software
conferences, with 15 tracks.
- Till had access to the whole conference and all evening events due to being one of the
eight fellows of the Linux Foundation.
- Till did not give a talk there but he met a lot of people, also an old friend from the
early 2000s and also Kate Stewart from the Linux Foundation to talk about the Future of
OpenPrinting. There were also great social events in the evenings, in the Guinness
Storehouse and in the Teelings Distillery.
- And Till won a BeagleBone IA64 in the closing plenary of the embedded Linux track!
- Progress report
- A lot of organization and preparation work is going on! Till is also one of the members
of the event's organization team.
- The site has completely changed now. The preliminary announcement page has been replaced
by an Indico-based interactive site where you can register for attending and submit your
proposal for a talk or a workshop.
- Please be quick with your ideas for contributions. The call for proposals ends on
30 September. And note that Canonical will pay all your costs (travel, accommodation,
meals) if your in-person proposal gets accepted. Formats available are interactive
workshops, regular talks in two sizes and lightning talks in two sizes.
- Till has already seen first proposals coming in and there are already many interesting
talks which would make the Summit be a great conference. But we need many, many more.
Especially success stories with Ubuntu, techniques of getting your work done with Ubuntu,
and of application development and distribution are highly welcome. Also hands-on
workshops, especially about robotics, IoT, Raspberry Pi, embedded,... are sought-after.
- We also want to offer a Snap Tutorial Track ("Your application everywhere, just in a
Snap!"), so that the many application developers in the community learn how to snap their
work to easily distribute it, making it available in many distributions: Ubuntu, Debian,
SUSE, Red Hat, Windows,...
- For this we are looking for workshops about advanced Snap techniques (GTK/GNOME, Qt/KDE,
Flutter, Games,...). Interactive hands-on workshops are preferred.
- See also the Ubuntu blog from Heather Ellsworth (also in the organization team) about the
call for proposals, with detailed instructions for a hopefully successful proposal.
- See also the initial announcement blog from Philipp Kewisch, Community Manager at
Canonical and one of the chairs of the event.
- And if you are eager to get the latest news quickly instead of waiting for Till's OP
October News post, just subscribe to the official Ubuntu Summit newsletter (see link).
- Any questions? Please ask summit@ubuntu.com.
- Get in touch with the people behind Ubuntu in Prague!!
- Progress report
- Now the third month of the coding period of the Google Summer of Code 2022 has passed
and our contributors are continuing their great work! And the coding is not over yet, as
we are applying a new feature of the GSoC. We have extended the coding period for all our
seven students, primarily to compensate for them having exams of their schools during the
original coding period, or classes already having restarted. For that we extended 4 weeks.
- In our GNOME Control Center sub-team (Mohit and Shivam) we have extended for even 6 weeks,
to give the GNOME design team the time to get the changes on the GUI right.
- And here are the third editions of their little summaries (again in our group chat on
Telegram) of what they have done:
* Converting Braille embosser support into a printer application
Contributor: Chandresh Soni
Mentors: Till Kamppeter, Samuel Thibault
"Hello everyone, in the last few weeks I have created a separate driver for embossers and
integrated them with the main application. I have also completed automake for the printer
application, with only minor changes remaining. I plan to begin testing the application
this week and fine-tune it based on the results of the testing."
* Scanning Support in PAPPL
Contributor: Deepak Khatri
Mentors: Till Kamppeter, Michael Sweet, Dheeraj Yadav, Deepak Patankar
"Hi everyone, in last few days I have been going through my work to integrate it into
pappl. In last few weeks I improved scanner objects and try to implement the API
papplSystemSetScannerDrivers. I am also trying to understand the similarities of code
to be used in Driver Interface."
* Adding Common Print Dialog Backends (CPDB) support to existing Print Dialogs
Contributor: Gaurav Guleria
Mentors: Till Kamppeter
"I have started work on the CPDB support for Qt Print Dialog. I have created a basic CPDB
print plugin for Qt here: https://github.com/TinyTrebuchet/qtbase/tree/cpdb with help from
Albert Astals Cid (tsdgeos). I have also got in touch with the Qt development team to
decide how exactly should CPDB support be added into the QPrintDialog.
Further, I have done some bug fixes, improvement and added new features to cpdb-libs.
cpdb-libs now has support for obtaining and setting user and system wide default printers:
https://github.com/OpenPrinting/cpdb-libs/pull/10
and also supports multiple unique media margins for each media size:
https://github.com/OpenPrinting/cpdb-libs/pull/8"
Discussion with the Qt upstream developers on their mailing list:
https://lists.qt-project.org/pipermail/development/2022-September/042993.html (initial)
https://lists.qt-project.org/pipermail/development/2022-September/thread.html (thread)
* GNOME Control Center GUI for discovering non-driverless printers and finding suitable
Printer Applications for them
Contributor: Mohit Verma
Mentors: Till Kamppeter, Michael Sweet, Pranshu Kharkwal, Divyasheel, Deepak Patankar
"I have completed the work of discovery of Printer Applications along with their binary
paths. I have also weeded out the duplicate entries listed by Avahi. With the Printer
Application look-up service in place, I have started the work on a temporary GUI for the
Printer Application which can be adjusted to the final design once it is finalized by
Marek Kasik. This GUI will be completed by the end of this week. So, by the end of this
month we will have a makeshift GUI which can search for the most appropriate Printer
Application on the Open Printing and install it as well along with other desired
functionalities."
Further discussion happened on Mohit´s issue report:
GNOME Issue report #1878: Allow to add new printers via Printer Applications
https://gitlab.gnome.org/GNOME/gnome-control-center/-/issues/1878
cups-pk-helper PR #7: Added discovery of Printers via lpinfo, PAPPL and Printer
Applications
https://gitlab.freedesktop.org/cups-pk-helper/cups-pk-helper/-/merge_requests/7
* Scanning Support in PAPPL with eSCL Support
Contributor: Rishabh Maheshwari
Mentors: Till Kamppeter, Michael Sweet, Dheeraj Yadav, Deepak Patankar
"I have completed all the necessary functions required for the parsing of client scanner
requests and store the device capabilities in a data structure. I have also completed
developing the helper functions required for this functioning. Currently, I am waiting for
Deepak to finish his work towards developing some simple test facility which emulates the
behavior of a scanner using static images which will be used by me for testing my code."
* Add Avahi calls for discovering and resolving driverless IPP printers and Optimize the
processes
Contributor: Sachin Thakan
Mentors: Till Kamppeter, Michael Sweet, Deepak Patankar
"Hi all, I have been working on integrating my earliar work into cups-filter. In last few
weeks, I refactored and improved my avahi implementation and tried building cups-filter on
my system (having encountered some issues with my already build version of cups-filter) to
get started with 2nd phase of the project. I am hoping to make fast progress in coming
weeks. Thanks"
* Create new printer setup tool for the GNOME Control Center
Contributor: Shivam Mishra
Mentors: Till Kamppeter, Pranshu Kharkwal, Divyasheel, Deepak Patankar
"Hi everyone, I have completed integration of GUI functionality of configuring IPP system
service with IPP printing services listing in the main panel along with CUPS queues. As of
now I'm working on fine-tuning & other possible updates, and also looking for integration
of discovery of Printer applications in the module."
Feature requests so far:
#1877: Improve setting of IPP options
https://gitlab.gnome.org/GNOME/gnome-control-center/-/issues/1877
#1879: Do not show setting of drivers for IPP printers
https://gitlab.gnome.org/GNOME/gnome-control-center/-/issues/1879
#1911: Printers: Make adminurl available for IPP printers
https://gitlab.gnome.org/GNOME/gnome-control-center/-/issues/1911
- GSoC 2022 Timeline
- DONE - 7 February 2022 - Mentoring organizations begin submitting applications to Google
- DONE - 21 February 2022 - Mentoring organizations application deadline
- DONE - 21 February to 6 March 2022 - Google administrators review organization applications
- DONE - 7 March 2022 - List of accepted mentoring organizations published - LF accepted
- DONE - 7 March to 3 April 2022 - Potential GSoC contributors discuss with mentoring orgs
- DONE - 4 April - GSoC contributor application period begins
- DONE - 19 April 2022 - GSoC contributor application deadline
- DONE - 12 May 2022 - GSoC contributor slot requests due from Org Admins
- DONE - 20 May 2022 - Accepted GSoC contributor projects announced - 8 OP standard projects!
- DONE - 20 May to 12 June 2022 - GSoC contributors meet mentors, read docs, get up to speed
- DONE - 13 June 2022 - Coding officially begins!
- DONE - 25 July 2022 - Mentors and contributors begin submitting Phase 1 evaluations
- DONE - 29 July 2022 - Phase 1 Evaluation deadline (standard coding period)
- DONE - 25 July to 4 September 2022 - GSoC contributors work with guidance from Mentors
- DONE - 5-12 September 2022 - Contributors final code/mentor evaluations (standard period)
- DONE - 12-19 September 2022 - Mentors submit final evaluations (standard period)
- OP Projects Extended - 10 or 24 October 2022 - Continue coding (extended periods)
- Progress report
- While our GSoC contributor Gaurav Guleria is working on adding CPDB support to the print
dialogs (see above) he has continued to do fixes and improvements on the CPDB framework
itself:
* Support for each media having multiple sets of margins
* Support for overall default printers
* Distinguishing print and fax queues amd providing needed extra options
- Also this will get included in the 2.0 release of the Common Print Dialog Backends.
- For the release itself Till will still wait a little bit, as Gaurav could find other
needs of functionality during his work on the Qt dialog.
- Progress report
- We get really close now. Till is in the middle of cleaning up all the code to get a unique
coding style and to make it more readable.
- For the coding style I follow the DEVELOPING.md file of the CUPS source code, to extend
this to all OpenPrinting projects.
- To improve the readability of the code, Till also added missing spaces in comma-separated
lists (xxx,yyy,zzz -> xxx, yyy, zzz) and around operators
(x=a*(b+c)%4 -> x = a * (b + c) % 4), what got nearly completely missed out by several
contributors.
- Comments are re-formatted to use // ... instead of /* ... */, like in PAPPL, so C and C++
files get the same comment style.
- Till did this already on the code for the cfFilterPDFToPDF() filter function and on a bunch
of other files of libcupsfilters.
- In addition, Till did final testing, bug fixing and polishing:
- Made the new cups-filters correctly working with the PPD files for driverless printers
generated by CUPS (temporary CUPS queues and creating queues with
lpadmin ... -m everywhere ...) and also with PPD files of older cups-filters 1.x
versions.
- Added NULL checks when filter functions of libppd (especially also ppdFilterExternalCUPS)
are called without PPD file, to avoid crashes. This especially prevented all maintenance
tasks (poll default option settings and installable accessory configuration from
PostScript printers, identify printer, …) in the retro-fitting Printer Applications from
working.
- Replaced all assert() calls in the 3 libraries (libfontembed, libcupsfilters, libppd) by
macros to only be actual assert() calls when the DEBUG macro is set, to avoid automatic
bug reports (apport) in production use.
- Correctly check final output type to determine which filter does the page logging.
- Page logging for PostScript output.
- Compare MIME type strings case-insensitively in the cfFilterUniversal() filter function.
- When generating a printer IPP attributes record from the PPD file, make sure that all
attributes concerning custom page size are included.
- Import template directory name when calling cfFilterBannerToPDF() via cfFilterUniversal()
- Let ppdFilterPDFToPS() correctly determine the print resolution.
- Improvements on getting printer IPP attributes from the PPD, on attributes
printer-resolution, device-uri, document-format-supported,
print-content-optimize-supported, media-col-ready, media-ready, removed irrelevant code
about supply levels.
- Fixed selection of PDF renderer in the build system.
- Added support for Poppler’s pdftops to the cfFilterUniversal() filter function/universal
CUPS filter.
- In cfFilterPDFToRaster() fixed margins of output pages.
- cfFilterRasterToPDF() only accepts PWG Raster, not CUPS Raster, so renamed it to
cfFilterPWGToPDF() and only feed PWG Raster into it.
- Finally removed the not-used-by-anyone PHP and Perl APIs.
- Also removed legacy image format support.
- Merged pull request to add configuration directive to cups-browsed to not check the
network interfaces too frequently, to improve its performance. Thanks a lot to Zdenek
Dohnal from Red Hat for the contribution.
* pappl-retrofit
- Till also adapted the printer driver retro-fit library and where needed thet Printer
Application to the last and final changes of the cups-filters 2.x API, and while doing
this, also fixed a crasher in pappl-retrofit.
- Naturally, Till also tested everything and found that after printing a job or doing an
administrative task (Identify printer, poll accessory configuration) the Printer
Applications start to consume 100% CPU permanently. After reporting a bug on PAPPL
earlier, Michael Sweet actually found a 100%-COU problem in the job history clean-up
code and fixed it, but the 100%-CPU problem persisted for me. Till Investigated further
and found that it only happens on printers with CUPS backends. So he worked around it by
temporarily de-activating the not yet completed supply read-out support. But doing more
tests the 100%-CPU monster was rearing its heads again, but before he could investigate,
he had to reboot on a browser memory clog-up crash and after that the 100% CPU was gone,
probably a bad effect of the system having run out of memory...
- Now it seems to be all working as intended.
- Progress report - 625 printers certified for IPP Everywhere v1.0 - 316 printers certified for IPP Everywhere v1.1
- Progress report
- Printer Application look-up service is now live
- We have finally deployed the Printer Application look-up service for printer setup tools
on the OpenPrinting web server for printer/driver look-ups!
- Till did some tests and everything works as expected. Printer Application Snaps installed
on the server find the correct drivers for the given printer device ID and the user (or
better the printer setup tool) gets as answer a hierarchy list of what are the best Printer
Applications which support their printer and with which internal driver.
- Till passed this on to our GSoC contributors working on the GNOME Control Center, so that
they make use of it.
- If you want to try it out, try URLs like:
https://openprinting.org/query.php?papps=true&device-id=MFG:HP;MDL:LaserJet%204050
https://openprinting.org/query.php?papps=true&device-id=MFG:Epson;MDL:Stylus%Photo%20R800
- This is actually a machine communication interface for printer setup tools, an interface
for humans will come later.
- Thanks a lot to Violet Kurtz from the OSUOSL for implementing this!
- Progress report - ipp-usb is available as a Snap in the Snap Store now (2715 downloads)
- Progress report - No update
- Progress report
- Current PAPPL release is v1.2.2 on 21 September 2022.
- In the last months the development of the v1.3.x series has already started. See changes
below.
* Summary of PAPPL v1.2.2 (Mike)
- General bug fix release. See changes below.
- All the CUPS-driver-retro-fitting Printer Applications in the Snap Store use the current
GIT master of PAPPL, so they contain all the latest fixes and improvements.
- See also the currently open and closed issues of PAPPL.
* Changes in PAPPL v1.2.2 (Mike)
- Added debug logging for device management.
- Fixed a device race condition with job processing.
- Fixed a potential value overflow when reading SNMP OIDs (Issue #210)
- Fixed more CUPS 2.2.x compatibility issues (Issue #212)
- Fixed a 100% CPU usage bug when cleaning the job history (Issue #218)
- Fixed the default values of '--with-papplstatedir' and '--with-papplsockdir' to use the
'localstatedir' value (Issue #219)
- Fixed a initialization timing issue with USB gadgets on newer Linux kernels.
* Changes in PAPPL v1.3b1 (Mike)
- Added timer APIs to manage periodic tasks (Issue #208)
- Added debug logging for device management.
- Fixed a device race condition with job processing.
- Fixed a potential value overflow when reading SNMP OIDs (Issue #210)
- Fixed more CUPS 2.2.x compatibility issues (Issue #212)
- Fixed a 100% CPU usage bug when cleaning the job history (Issue #218)
- Fixed the default values of '--with-papplstatedir' and '--with-papplsockdir' to use the 'localstatedir' value (Issue #219)
- Fixed a initialization timing issue with USB gadgets on newer Linux kernels.
- Updated PAPPL to conform to the new prototype PWG 5100.13 specification (Issue #216)
- Progress report - No update
- Progress report - No update
- Progress report - Gutenprint is available as a Snap in the Snap Store now (4661 downloads)
- Progress report - HPLIP is available as a Snap in the Snap Store now (5742 downloads)
- Progress report - Ghostscript is available as a Snap in the Snap Store now (1787 downloads)
- Progress report - PostScript is available as a Snap in the Snap Store now (2558 downloads)
- Progress report
- CUPS is available as a Snap in the Snap Store now (82922 downloads)
- Now with the cups snapd interface in place Snap package maintainers are starting to use it.
- Unfortunately, we have hit a bug in snapd with the new cups interface. The automatic
dependency installation of the CUPS Snap via the pseudo content interface with
default-provider: cups interferes badly if the Snap using the cups interface for printing
is seeded (being in the list of default packages used in the OS distribution), even if the
CUPS Snap is also seeded.
- Till hopes the bug gets solved soon by the snapd team at Canonical. Otherwise we will
simply skip right to the real integration of the CUPS Snap dependency in the cups interface
without any ugly workarounds. For this Till already planned to meet the snapd team
in-person for working on an appropriate solution on Canonical's internal Engineering Sprint
in Prague, in the week before the Ubuntu Summit. The implementation will then be scheduled
to be finished for Ubunru 23.04, the first Ubuntu using the CUPS Snap as standard print
environment and the New Architecture.
- Application developers in the community uploading their work to the Snap Store can still
freely use the cups interface without any problems. Only the few Snaps which are in the
default installation/the ISO of Ubuntu are affected (and have to stay with cups-control
for the time being), and those are usually maintained by Canonical employees anyway.
- Progress report - No update
- Project report - No update
- CUPS (Mike and Zdenek)
- Current release is OP CUPS v2.4.2 on 26 May 2022.
- There will be further bug fix releases in the v2.4.x series. Some bug fixes were done
during the last month, see changes below.
- Ubuntu Kinetic Kudu (22.10 will most probably come with v2.4.3.
- The CUPS Snap (in the Edge channel) and our CUPS-driver-retro-fitting Printer Application
Snaps use the current GIT master of CUPS.
- The CUPS Snap in the stable channel is version v2.4.2.
* Changes in CUPS v2.4.3 on 26 May 2022 (Mike and Zdenek)
- Fixed an OpenSSL certificate loading issue (Issue #465)
- Fixed Brazilian Portuguese translations (Issue #288)
- Fixed invalid memory access during generating IPP Everywhere queue (Issue #466)
- Fixed memory leaks in 'create_local_bg_thread()' (Issue #466)
- Fixed TLS certificate generation bugs.
- Ignore some of IPP defaults if the application sends its PPD alternative (Issue #484)
- Now report fax attributes and values as needed (Issue #459)
- Update print-color-mode if the printer is modified via ColorModel PPD option (Issue #451)
- CUPS Filters (Till)
- Currently release is v1.28.16 on 24 August 2022.
- The restructuring of the code to separate the siamesian twins of the filter functions and
PPD file support is completed and we also have done a lot of testing and bug fixing. Now we
are finally polishing the coding style and updating the license/copyright headers for the
v2.0.0 release.
- As cups-filters v2.0.0 will not make it into Ubuntu 22.10 we continue with further bug fix
backport releases in the v1.x series.
* Summary of CUPS Filters release v1.28.16 (Till).
- Bug fix release, to make images be printed in their original size with "print-scaling=none"
and to not use deprecated data types for reading TIFF images.
- Ubuntu Kinetic Kudu (22.10 will coming with cups-filters v1.28.16 or a later v1.28.x
release.
- The CUPS Snap is currently locked to the /e496badbf2 commit (from May 20) of cups-filter's
GIT master (2.x) until the restructuring gets more tested. The Printer Application Snaps
use the current GIT master of cups-filters and so are the first application for real-life
testing.
* Changes in CUPS Filters release v1.28.16 on 24 August 2022 (Till)
- imagetoraster, imagetopdf, libcupsfilters: Added support for reading the resolution of an
image from its EXIF data when loading it. This way we get the image reproduced in its
original size with "print-scaling=none" (Issue #362).
- libcupsfilters: Replaced deprecated data types uint16 and uint32. The function to read TIFF
image files via libtiff in cupsfilters/image-tiff.c uses the deprecated types uint16 and
uint32. The replacements for these types are uint16_t and uint32_t.
- PWG Virtual F2F - 16-18 August 2022 - Ira attended
- https://www.pwg.org/chair/meeting-info/august-2022-virtual.html
- PWG Virtual F2F - 15-17 November 2022 - Ira to attend
- https://www.pwg.org/chair/meeting-info/meetings.html
- Status of AMSC and ISO liaisons w/ PWG (Paul Tykodi)
- http://ftp.pwg.org/pub/pwg/general/sc/pwg-sc-call-minutes-20220725.htm
- http://ftp.pwg.org/pub/pwg/general/sc/pwg-sc-call-minutes-20220822.htm
- http://ftp.pwg.org/pub/pwg/general/sc/pwg-sc-call-minutes-20220919.htm
- see PWG Steering Committee minutes from 07/25/22, 08/22/22, 09/19/22
- PWG Hardcopy Device Security Guidelines v1.0 - Interim draft
- https://ftp.pwg.org/pub/pwg/ids/wd/wd-idshcdsec10-20220208-rev.pdf
- for a Best Practice
- PWG F2F review on 9 February 2022
- Schedule - Prototype draft in Q4 2022 / Q1 2023
- IPP Everywhere v1.1 Printer Self-Certification Tools Update 4 (Mike)
- https://www.pwg.org/archives/ipp/2022/021227.html
- v1.1 Tools Update 4 fourth last call started 19 August 2022 and is still open
- PWG F2F discussion on 16 August 2022
- IPP WG discussion on 1 September 2022
- IPP WG Last Call started 08/19/22 and ended 09/02/22
- Approved and Released on 2 September 2022
- IPP Workgroup Charter (Ira) - PWG Approved
- http://ftp.pwg.org/pub/pwg/ipp/charter/ch-ipp-charter-20210409.pdf
- update for new IPP WG projects
- PWG Approved on 9 April 2021
- IPP INFRA Cloud Proxy Registration (Cihan, Mike) - proposed
- https://www.pwg.org/archives/ipp/2020/020688.html
- https://ftp.pwg.org/pub/pwg/ipp/slides/ipp-wg-agenda-november-20.pdf
- for a Registration (near-term)
- minor update of IPP System Service and IPP Infrastructure Printing
- offline discussions with Microsoft about Universal Printing coherence
- PWG Virtual F2F discussion on 6 May 2021
- Schedule - TBD
- IPP Finishings v3.0 (Smith) - Candidate Standard
- https://ftp.pwg.org//pub/pwg/candidates/csippfinishings30-20220527-5100.1.pdf
- for a Candidate Standard
- major update of PWG 5100.1-2017
- Published on 27 May 2022
- IPP Production Printing Ext v2.0 (Mike) - Stable draft
- https://ftp.pwg.org/pub/pwg/ipp/wd/wd-ippppx20-20220708-rev.pdf
- for a Candidate Standard
- major update of PWG 5100.3-2001
- PWG status at PWG Virtual F2F on 16 August 2022
- IPP WG discussion on 1 September 2022
- IPP WG Last Call started on 08/25/22 and ended on 09/09/22
- Schedule - PWG Last Call in Q3/Q4 2022
- IPP Enterprise Printing Ext v2.0 (Smith) - Prototype draft
- https://ftp.pwg.org/pub/pwg/ipp/wd/wd-ippepx20-20211101-rev.pdf
- for a Candidate Standard
- PWG status at PWG Virtual F2F on 16 August 2022
- Schedule - Stable draft in Q3/Q4 2022
- IPP Driverless Printing Extensions v2.0 (Smith) - Stable draft
- https://ftp.pwg.org/pub/pwg/ipp/wd/wd-ippnodriver20-20220919-rev.pdf
- for a Candidate Standard
- major update of PWG 5100.13-2012
- PWG status at PWG Virtual F2F on 16 August 2022
- Mike reported on prototyping on 30 August 2022
- IPP WG review on 1 September 2022
- Mike reported feedback on "client-info" on 12 September 2022
- Schedule - PWG Last Call in Q4 2022
- IPP Encrypted Jobs and Documents (Mike/Smith) - Prototype draft
- https://ftp.pwg.org/pub/pwg/ipp/wd/wd-ipptrustnoone10-20210519-rev.pdf
- for a Candidate Standard
- PWG status at PWG Virtual F2F on 16 August 2022
- Waiting for prototyping
- Schedule - Stable draft in Q4 2022
- IPP Job Extensions v2.1 (Mike) - Initial draft
- https://ftp.pwg.org/pub/pwg/ipp/wd/wd-ippjobext21-20220809-rev.pdf
- minor update of PWG 5100.7-2019
- PWG review at PWG Virtual F2F on 16 August 2022
- Schedule - Prototype draft in Q4 2022
- IPP 2.x (Mike/Ira) - Interim draft
- https://ftp.pwg.org/pub/pwg/ipp/wd/wd-ippbase23-20220809.pdf
- major update of PWG 5100.12-2015
- PWG review at PWG Virtual F2F on 16 August 2022
- Schedule - Prototype draft in Q4 2022
- IPP Everywhere v2.0 (Mike/Ira) - Interim draft
- https://ftp.pwg.org/pub/pwg/ipp/wd/wd-ippeve20-20220510-rev.pdf
- major update - for a Candidate Standard
- PWG discussion at PWG Virtual F2F on 16 August 2022
- Schedule - Prototype draft in Q4 2022
- IPP Everywhere Printer Self-Certification Manual v2.0 (Mike/Ira) - Interim draft
- https://ftp.pwg.org/pub/pwg/ipp/wd/wd-ippeveselfcert20-20220510-rev.pdf
- major update - for a Candidate Standard
- PWG discussion at PWG Virtual F2F on 16 August 2022
- Schedule - Prototype draft in Q4 2022
- Linux Plumbers Hybrid F2F (Dublin, Ireland) - 12-14 September 2022 - Till, Aveek, Mike, Ira attended - https://lpc.events/ - ISO TC204 Hybrid F2F (Tampere, Finland) - 3-7 October 2022 - Ira to attend (WG16 Comms) - https://www.iso.org/committee/54706.html - ISO JTC1/SC27 JWG6 Hybrid F2F - 10 October 2022 - Ira to attend - https://www.iso.org/committee/45306.html - IEEE 1609 WG Virtual F2F - 11 October 2022 - Ira to attend - https://standards.ieee.org/develop/wg/1609.html - Uptane Europe Virtual Workshop - 13 October 2022 - Ira to attend - https://uptane.github.io/ - TCG Members Meeting Hybrid F2F (New Orleans, LA) - 25-27 October 2022 - Ira to attend - https://trustedcomputinggroup.org/ - IETF 115 Hybrid F2F (London, UK) - 7-11 November 2022 - Ira to attend - https://www.ietf.org/how/meetings/115/ - PWG Virtual F2F - 15-17 November 2022 - Ira to attend - https://www.pwg.org/chair/meeting-info/meetings.html - ISO WG11 SAE Cyber JWG Hybrid (Tokyo) - 28-30 November 2022 - Ira to attend - https://www.iso.org/committee/5383636.html - IEEE 1609 WG Virtual F2F - 6 December 2022 - Ira to attend - https://standards.ieee.org/develop/wg/1609.html - IQPC Auto Cyber Online - 6-7 December 2022 - Ira to attend - https://www.automotive-iq.com/events-automotive-cybersecurity-online
Open Action Items
Next OP US/Europe/Brazil/India Conference Calls
- Tuesday 18 October 2022, Daytime
- Web conference to be announced
- Note - ISO TC204 Plenary Hybrid (Tampere, Finland) - 2-7 October 2022
- Note - ISO JTC1/SC27 JWG6 Hybrid F2F - 10 October 2022
- Note - IEEE 1609 WG Virtual F2F - 11 October 2022
- Note - Uptane Europe Virtual Workshop - 13 October 2022
- Note - TCG Members Meeting Hybrid F2F (New Orleans, LA) - 25-27 October 2022
- US
10am in San Francisco - US PDT (Pacific Daylight Time)
11am in Colorado - US MDT (Mountain Daylight Time)
12am in Chicago - US CDT (Central Daylight Time)
1pm in New York - US EDT (Eastern Daylight Time)
- Europe
7pm in Berlin - CEST (Central Europe Summer Time)
- Brazil
2pm in Belo Horizonte - BRT (Brasilia Time)
- India
10:30pm in New Delhi - IST (India Standard Time)
- Tuesday 15 November 2022, Daytime
- Note - Europe Summer Time ends on 30 October 2022
- Note - US Daylight Savings Time ends on 6 November 2022
- Note - IETF 115 Hybrid F2F (London, UK) - 7-11 November 2022
- Note - PWG Virtual F2F - 15-17 November 2022 - conflict w/ OP Monthly call
- Note - ISO WG11 SAE Cyber JWG Hybrid (Tokyo) - 28-30 November 2022
- US
10am in San Francisco - US PST (Pacific Standard Time)
11am in Colorado - US MST (Mountain Standard Time)
12am in Chicago - US CST (Central Standard Time)
1pm in New York - US EST (Eastern Standard Time)
- Europe
7pm in Berlin - CET (Central Europe Time)
- Brazil
3pm in Belo Horizonte - BRT (Brasilia Time)
- India
11:30pm in New Delhi - IST (India Standard Time)
- Tuesday 13 December 2022, Daytime
- Note - IEEE 1609 Virtual F2F - 6 December 2022
- Note - IQPC Auto Cyber Online - 6-7 December 2022
- US
10am in San Francisco - US PST (Pacific Standard Time)
11am in Colorado - US MST (Mountain Standard Time)
12am in Chicago - US CST (Central Standard Time)
1pm in New York - US EST (Eastern Standard Time)
- Europe
7pm in Berlin - CET (Central Europe Time)
- Brazil
3pm in Belo Horizonte - BRT (Brasilia Time)
- India
11:30pm in New Delhi - IST (India Standard Time)