Till Kamppeter

Till Kamppeter

OpenPrinting Project Leader

OpenPrinting News - November 2023

27 minute read

Probably most of you have made their first desktop computer experience with Windows, and later on started working with a Linux desktop system. Many of your daily tasks which you formerly did under Windows you are doing under Linux now. Some work great, for others you wish your Windows back …

But having a look at this (stone-old, from Dec 2021) Linus Tech Tips video and especially Michael Tunnell’s reaction video, printing is not the part where one wants to have Windows back. At 3:00 min Michael says

There is no such thing like a pain-free experience of printing under Windows … Linux printing is ridiculously good …

and at 14:25-17:25 min we get the confirmation that one can effortlessly print even with an oooold, non-driverless Samsung CPL-something …

Thanks Michael, I am looking forward to our Destination Linux episode …

But there is more on YouTube, this time on Ubuntu OnAir. After the Ubuntu Summit I have stayed in Riga for one more week, for Canonical’s internal Engineering Sprint where all the engineers of Canonical, around ~700 people currently, meet twice a year, near the beginning of each Ubuntu development cycle. In addition to meetings inside and across the teams there are also lightning talks and workshops open for everyone on the Sprint.

I have given two sessions this time, both not containing anything Canonical-confidential and so I got the permission to publish the recordings on Ubuntu OnAir. Here we go:

  1. Lightning talk: Opportunity Open Source conference in the IIT Mandi, India: Motivating people to be a part of us!
  2. Interactive workshop: Your app everywhere, just in a Snap!

And last but not least, we have a nice video of the Ubuntu Summit 2022 in Prague, the Aftermovie, published shortly before this year’s Summit as motivation to attend.

And we have good news for users of NixOS: Now Snap is supported and so you cannot only install many application Snaps from the Snap Store but also our Printer Application Snaps to make all those ~10000 non-driverless legacy printers which are already working with common classic Linux distributions also just work with NixOS.

And everyone is providing an advent calendar these days, unfortunately we did not make one at OpenPrinting, but there is one from the Ubuntu Summit 2023! See below …

So let us dive into what happened at OpenPrinting in November …

And as usual: Stay updated on Mastodon: #OpenPrinting and @till@ubuntu.social.

Ubuntu Summit 2023 in Riga

Update: Complete playlist of all 88 sessions!

Recordings from the plenary room: Day 1, part 1, Day 1, part 2, Day 2, Day 3

And here is the Ubuntu Summit Advent Calendar: Recordings of the individual sessions in all rooms will be posted from today on until the end of this year on the Ubuntu Summit 2023 playlist on Ubuntu OnAir. Open 3 new videos every day (workshops on Wednesdays) for the coming 30 days. They are all edited by a professional editing team.

Mastodon: #UbuntuSummit, #UbuntuSummit2023

Now it has taken place, the second Ubuntu Summit, this year in Riga in Latvia, and we in the organization team are already making our first thoughts on the third one …

Two and a half days of amazing sessions in 5 rooms in parallel. The speakers on this second edition were less Canonical employees but more people from the wider community, and not exactly an Ubuntu Summit but more a Summit about Linux and free software in general.

Sessions

Still making well use of the hallway track I succeeded to attend many sessions, most of those I originally planned to attend and listed last month here:

  • Welcome to the Ubuntu Summit, Philipp Kewisch (Head of Community Team, Canonical), Mark Shuttleworth (Founder and CEO, Canonical), Nathan Haines (Ubuntu Community Council), Fri 11/3, 14:00 EET (video)
  • From origins to open source: The journey of DreamWorks Animation’s production path tracer, MoonRay, Randy Packer (DreamWorks Animation), Fri 11/3, 15:00 EET (video): Amazing presentation, with sample movie in the following break.
  • Introducing Ubuntu Core Desktop, Ken Vandine (Core Desktop development lead, Canonical), Oliver Smith (Product Manager Desktop, Canonical), Fri 11/3, 16:30 EET (video): Nice overview of the state of the art of the development of Ubuntu Core Desktop, and Ken shouted me out when it came to the printing part, I got up and the audience applauded … I have also answered the first user comment on the YouTube video of the recording.
  • Alioli ROV Submarine Drone, Juanmi Taboada, 11/3, Fri 17:00 EET (video): How a remote-controlled submarine to explore and photograph potential SCUBA diving sites was developed and all being controlled with free software. And the next day there came the surprise event: We all could test-d(r)ive it in the hotel’s pool (only 1.30 m deep, so no risk to implode it) …
  • What It’s Like to Build an Open, Repairable Laptop, Daniel Schaefer (Framework Computer), Sat 11/4, 9:00 EET (video): We are sustainable! Last year we have recycled old printers and this year we have easily repairable and practically arbitrarily upgradable laptops on the Summit. I also had a hallway session with Daniel afterwards and he was demonstrating how easily hardware components could get changed.
  • Windows Subsystem for Linux (WSL) - Make an awesome Linux environment directly on Windows, Craig Loewen (Microsoft), Sat 11/4, 9:30 EET (video)
  • Improving Snap maintenance: Automating tag updates on new upstream releases of the app - Interactive workshop, Till Kamppeter (Canonical/OpenPrinting), Jesús Soto (Canonical), Sat 11/4, 12:00 EET (video, slides): My workshop about Snap update automation. Also Sergio Costas and Ken VanDine, both passionate snappers in the Ubuntu Desktop Team at Canonical, and Sergio having worked together with Heather Ellsworth on the automation method I have presented in this workshop, were in the room in case people need help on the exercises.
  • Container craftsmanship: from a Pebble to a ROCK - Interactive Workshop, Cristovão Cordeiro (Canonical), Sat 11/4, 14:00 EET (video, slides, exercises): Right after my workshop there was a workshop for snapcraft-experienced snappers to learn packaging apps in OCI containers using rockcraft. I attended it as this could be a way to create an official OCI container of CUPS, based on the CUPS Snap. And the way how upstream software components are loaded for the container build is exactly the same as with snapcraft, so applying update automation here would require only modifying a few lines.
  • Skynet or Star Trek, what’s the future of AI? - Panel session, Graham Morrison (host, Canonical), Andreea Munteanu (Canonical), Craig Loewen (Microsoft), Frank Karlitschek (Nextcloud), Juan Luis Cano Rodríguez (QuantumBlack, AI by McKinsey), Pablo Ruiz-Múzquiz (Kaleidos/Penpot), Sun 11/5, 9:00 EET (video)
  • ScaniVerse: A New Horizon in Unified Scanning for Linux Systems Akarshan Kapoor (Indian Institute of Technology, Mandi, India), Sun 11/5, 11:30 EET (video): Akarshan presenting his GSoC work of this year in his own, special style. I have been in his talk especially also to help answering questions and I have remarked in the end that one should be careful with making the MetaScan frontend send the user’s Scan to external internet services for analysis, for privacy reasons.
  • Bringing Windows applications to Linux app stores, Merlijn Sebrechts (Ubuntu Community Council, Snapcrafters), Sun 11/5, 12:00 EET (video): WINE allows to run many Windows apps under Linux but needs some configuration and setup work. To make it easy for end users to simply grab Windows apps in the Snap Store, there is Sommelier, which this talk was about. I asked Merlijn what about having a “app loader” Snaps using Somellier which do not contain the (often proprietary) app but just load it from the Windows file system to run it uner Linux. He told that this is already possible, especially with Bottles and Lutris (31:48 min).
  • Behind the Scenes of tox: The Journey of Rewriting a Python Tool with Over 10 Million Monthly Downloads, Jürgen Gmach (Canonical), Sun 11/5, 14:30 EET (video): Jürgen is nearly as long into free software as me, I started with SUSE 5.1 in 1997, he two years later with SUSE 7.0.
  • Linux Lads live podcast recording, Shane, Mike, Conor, and Amolith (Linux Lads Podcast), Sun 11/5, 16:00 EET (video, actual podcast): This was great, the Linux Lads podcast produced live with audience interaction. I have taken a first-class seat (first row), with these signs “content creators only”, but hey, this news post is content, and my talks and workshops on conferences, too, and so I was close to them and contributed. At 20:40 min I give an example how meeting on conferences causes actions and tell why the Linux App Summit 2024 will take place in Monterrey, Mexico, and at 45:25 min I give an example how conference attendees come well equipped for winter weather.
  • Closing Plenary, Philipp Kewisch (Head of Community Team, Canonical), Sun 11/5, 17:30 EET (video)

Hallway Track

But most important of all is the hallway track (including any evening outings, meals, bar hangouts, …).

For me it started already one day before the official opening of the Summit, as I traveled already on Thursday, the day before the event started, to make sure to be there in time, even if the airline messes up my flight.

I had an early morning flight, directly from Vienna to Riga, and there I met already Andrei Iosif of Canonical’s Security Team. So this was not actually a hallway session but more an inflight session. We happened to have seats close to each other and swapping with one other passenger we were sitting together. He told me about Fuzz testing, a special method to test software with random input to find crasher bugs, buffer overflows and similar which can cause severe security risks. He introduced me to Google OSS-Fuzz a free-of-charge service for free software projects and the possibility to fuzz-test OpenPrinting projects.

I arrived in the hotel at lunch time, and so I already attended the hallway track of the last days of Canonical’s internal Product/Roadmap Sprint, where Canonical’s managers meet twice a year for one week each time. So several colleagues from Canonical I have met already there and this way got more time to meet old and new friends from the community on the actual Summit days.

Thursday evening I finally met with non-Canonical people for the first time on this trip. We had dinner in the old town of Riga, mainly colleagues of Canonical’s Desktop Team, like Ken VanDine, Sebastien Bacher, Jesús Soto, Jean-Baptiste Lallement, … also Jürgen Gmach of the Launchpad Team, but also several non-Canonical people, as for example Alan Pope (“Popey”) or Martin Wimpress (“Wimpy”).

And on Friday at lunch time, right before the start of the event I met Akarshan Kapoor, GSoC contributor on PAPPL Scanning (see below) and Monica Ayhens-Madon, formerly in Canonical’s Community Team and currently at Thunderbird (LAS 2022, Ubuntu Indaba, Community Office Hours). Monica hugged me saying that this is a hug from Heather, and so I hugged her back, telling her to pass this hug back to Heather.

On the event I had several nice hallway sessions:

  • Daniel Schaefer demonstrating the repairability and upgradeability of Framework laptops, everything held together by magnets and screws which do not fall out when unscrewed, no soldered-in RAM, everything modular to separately exchange and upgrade, even while the machine is turned on and running …
  • Popey (Alan Pope) is proudly presenting his Steam Deck running Ubuntu Core Desktop, naturally hanging out a lot with Ken VanDine therefore.
  • We had a little Raspberry Pi demo table during the whole conference, right in front of the door of the plenary room, with a Pi (4 or 5) connected to a large monitor, a keyboard and a mouse, and different things were shown there: Ken VanDine was naturally showing off Ubuntu Core Desktop on the Raspberry Pi 4 (did not work yet on the 5, Ken spent nearly the whole Engineering Sprint in the week afterwards to get this finally going). And our gamers one also found often enough showing off their work on the Pis.
  • I met Diogo Constantino from the Ubuntu Portugal local community and we exchanged ideas about combining DebConf 2024 and UbuCon 2024, holding both, one after the other in Aveiro in Portugal. Originally DebConf should have taken place in Haifa in Israel, but this got canceled and the Call for Locations re-opened.
  • Noah J. Chelliah met me on the hallway and asked me for an interview, for his “Ask Noah” podcast. So we immediately went to an unused conference room for a “Noah asks” and we recorded the interview, me telling him about OpenPrinting, how it started and what we are doing. The interview will get put into one of the next shows, but he told that he also interviewed more people, so it can take some weeks until it is my turn (Update: It will be episode 368 due on Tuesday, December 20, ~11:59pm UTC).
  • Amolith (from the Linux Lads) has created scripting to get informed about new releases of software running on his server, Willow, and it seems that it covers more types of upstream release notifications than our Snap update automation, so I have a way to improve the Snap automation if needed.
  • Monica Ayhens-Madon came up with a little penguin which she has bought in the old town of Riga and wants to give it to a good friend who collects penguins (Update: It is Jill from Destination Linux), but first, gave it a tour on the Summit, taking a lot of photos with many interesting people. See her thread on Mastodon (Update: The penguin has safely arrived at its Destination (Linux)! Thanks, Mathieu Comandon! Jill’s thread on Mastodon, Jill’s LWDW/linuxgamecast video).
  • When leaving the closing plenary, Michael Tunnell from TuxDigital and one of the hosts of Destination Linux grabbed me in the crowd leaving the plenary room and invited me for an interview in one of the next episodes of Destination Linux (Update: The interview has been produced now and will be on the road as episode 351 from Monday, December 18, ~10pm UTC on).
  • And during the closing party I met Graham Morrison, master of the Snap/snapcraft documentation at Canonical, and suggested to him to put up all my Snap workshop materials (slides, exercises, video links) onto the snapcraft.io web site for people to learn Snap or to give the workshops on more conferences, and he liked the idea … See below.

Blogs and podcasts

Naturally there are many content creators, bloggers, podcasters, YouTubers, … on such an event, and so we already have some nice stuff to read, listen to, and watch (taken from the internal list of the organization team):

Probably this list will get longer next month.

FOSDEM 2024

After many, many years I will attend FOSDEM again! The last time I attended it was in the early 2000s when I worked at MandrakeSoft in Paris, having only 90 min by train to get there. From Vienna I will have to take a 2-hour flight.

FOSDEM (Free and Open Source DEveloper’s Meeting) is a large conference. It is registration-free, anyone can just walk in and attend all the talks. There are more than 8000 visitors to enjoy more than 600 sessions in 36 rooms in parallel and ~60 non-commercial exhibition booths.

There are a few rooms for plenary sessions, main track, and lightning talks with the sessions selected by the organizers of FOSDEM itself, but most rooms are the so-called devrooms. 59 free software community projects selected by a call for proposals for the devrooms have received a devroom and are responsible to fill it with sessions, usually via a call for proposals for presentations. These calls for proposals are currently open and depending on the devroom will close between Dec 1st and Dec 8.

I have done 6 submissions, all for sessions which I have already given in similar form on other conferences, but I will naturally update them where needed. This is what I have submitted (with links to my most recent versions of these sessions):

  • Desktop Linux, as easy as a smartphone! Just in a Snap! - Talk telling what Snap and Ubuntu Core Desktop are and how they work
  • Your app everywhere - Just in a Snap! - Interactive Workshop - Attendees learn packaging applications as Snaps, with exercises on their own laptops
  • OpenPrinting - We make printing just work! - How it all started, what we have achieved, and what we are currently doing
  • Save Legacy Printers under Windows with WSL and Printer Applications - Installing Printer Applications under WSL to support printers where Microsoft or the printer manufacturer do not supply drivers any more
  • Opportunity Open Source conference in the IIT Mandi, India: Motivating people to be a part of us! - About the conference I have organized in India to motivate people to join free software

Most probably not all of these proposals will get accepted, especially the proposal for the workshop in the Distributions devroom is rather experimental, and also if the two sizes of the talk about the Opportunity Open Source get accepted, I will perhaps only give the long version.

Google Summer of Code 2024

Next year we will have a GSoC again, and this time a very special one, the 20th GSoC!!

It got announced a few weeks ago.

I will participate again with the Linux Foundation and OpenPrinting, there is enough to do … And we are already starting with finding and selecting contributor candidates.

Potential project ideas are:

  • Desktop integration: CPDB support for the print dialogs of Mozilla (Thunderbird/Firefox) and LibreOffice
  • Desktop Integration: Update system-config-printer for the New Architecture of printing
  • Desktop Integration: User interfaces for using OAuth2 with printers and scanners
  • CPDB backend for IPP infrastructure/cloud printers
  • Turn cups-browsed into a Printer Application

Note that for general acceptance of CUPS 3.x and of the CUPS Snap we need to have a desktop integration for all desktops, not only for GNOME.

Suggestions for any further project ideas are more than welcome.

And if you like to be a GSoC contributor next year, please contact me (till AT linux DOT com).

Google Summer of Code 2023

This year’s GSoC came to an end and 4 of our originally 6 GSoC contributors have passed their final evaluations. They did awesome work which brought us a lot closer to have a smooth transition to CUPS 3.x and its PPD-less New Architecture. The projects still need a little work, but the contributors will finish this in their end-of-year breaks.

And here are the final results:

OpenPrinting: CPDB support for application’s print dialogs: Firefox, Chromium, LibreOffice
Contributor: Kushagra Sharma
Mentors: Till Kamppeter, Gaurav Guleria, Shivam Mishra, Rithvik Patibandla, Ira McDonald
Work Product

PASSED

Sand-Boxed Scanner Application Framework
Contributor: Akarshan Kapoor
Mentors: Till Kamppeter, Rishabh Maheshwari, Deepak Patankar, Ira McDonald
Work Product

PASSED

GNOME Control Center: List and handle IPP print services for the New Architecture
Contributor: Mohit Verma
Mentors: Till Kamppeter, Marek Kašík, Zdenek Dohnal, Rithvik Patibandla, Ira McDonald
Work Product

PASSED

Continuous Integration: Test Programs for libcupsfilters, libpappl-retrofit, libppd, CPDB, CPDB Libs
Contributor: Pratyush Ranjan
Mentors: Till Kamppeter, Deepak Patankar, Zdenek Dohnal, Ira McDonald
Work Product

PASSED

Native gutenprint Printer Application
Contributor: Gayatri Kapse
Mentors: Till Kamppeter, Rishabh Maheshwari, Zdenek Dohnal, Ira McDonald
Work Product

FAILED

Native gutenprint Printer Application
Contributor: Yuvraj Aseri
Mentors: Till Kamppeter, Solomon Peachy, Rishabh Maheshwari, Chandresh Soni, Ira McDonald
Failed already on mid-term.

FAILED

Note that Gayatri’s original project was “Adding support for the new functionality of IPP Everywhere 2.x to libcupsfilters and CPDB”. This project turned out as not feasable and so I moved her to “Native gutenprint Printer Application”, after mid-term, the project where Yuvraj failed on.

Our contributors liked a lot to work with OpenPrinting and expressed it in their final evaluations for the mentors:

Kushagra Sharma:

Thank you for amazing guidance, OpenPrinting is an amazing team and working along side helped me learn a lot , I hope to keep contributing and keep in touch with mentors and fellow contributors

Akarshan Kapoor:

I express my profound gratitude for the invaluable guidance and unwavering support bestowed upon me by my mentors throughout the duration of the GSoC program. Their exceptional ability to simplify intricate concepts, their constructive critique on my contributions, and their genuine interest in nurturing my growth as a developer have played an instrumental role in making this journey immensely rewarding. The consistent check-ins and their willingness to address any obstacles or concerns that I encountered were particularly commendable. Nevertheless, there were certain instances when I felt slightly overwhelmed by the pace of progress, prompting me to suggest that incorporating more structured milestones or periodic evaluations could prove advantageous in future endeavors. In conclusion, I am profoundly appreciative of the knowledge they shared with me; their mentorship has indubitably left an enduring imprint on my personal and professional development trajectory.

The mentors and the organization I encountered during my participation in GSoC left an indelible impression on me. The level of guidance, support, and communication extended to me was truly unparalleled, resulting in a seamless journey that proved immensely enriching. It became evident early on that their unwavering dedication lay not only in cultivating personal development but also fostering a conducive atmosphere for growth. Without a doubt, the mentorship offered and the program’s well-structured framework exceeded all expectations I had harbored prior to embarking upon this endeavor. Consequently, I find myself overwhelmed with gratitude for being granted such an invaluable opportunity

Mohit Verma:

It was a wonderful expericence to work with OpenPrinting.

I think they (the mentors) are the best out there.

Pratyush Ranjan:

I am really thankful for the support and response time, Till and Deepak gave me throughout the project.

Snap workshops

Workshop overview

No need to meet me giving a workshop on a conference, you can do them all at any time. Click the links in this section and get a great snapper … Snapcrafters and many upstream application projects need you …

  1. Your app everywhere, just in a Snap!: Introduction into Snap packaging (snapping) with simple GNOME/GTK applications as example (video, slides)
  2. Daemon Snapper’s Workshop: Snapping daemons and system applications (slides)
  3. Improving Snap maintenance: Automating tag updates on new upstream releases of the app: GitHub workflow to automatically update your Snap when an upstream source has a new release (video, slides)

Links to the exercises and examples are on the slides. You need to have snapcraft installed and working on your machine, follow the instructions in the “Setup” section of the first workshop or use the virtual machine (~6 GB, *.qcow2) if needed.

Stay updated on the official Snap workshop page on snapcraft.io!

How I got into giving Snap workshops

Back in mid-2022 when I joined the organization team of the Ubuntu Summit 2022 in Prague, I had a 3.5-hour 1:1 video call with the leader of the organization team, Mauro Gaspari, exchanging ideas of what we can do in this first Ubuntu Summit. And as he brought in that we could do 2-hour interactive workshops where attendees can try out the subject matter on their own laptops, I was immediately sold on that and formed the idea to do a workshop series on how to package applications as Snaps. Mauro liked this idea and I started to work on making it reality.

And on the Ubuntu Summit 2022 in Prague, one year ago, it actually has taken place: One introduction panel and 5 workshops. All the speakers, including me, have put a lot of effort in designing the workshops and especially also the accompanying examples/exercises. Too much for presenting this only one single time …

The first workshop, the one to learn the basics, “Snapping like hell(sworth)”, originally given by Heather Ellsworth and Lucy Llewellyn, got already re-enacted as “Snapping with Lucy” soon after, only by Lucy on the DORS/CLUC in May 2023, in Zagrep, Croatia.

Not actually knowing about Lucy’s edition I also formed the idea to give Snap workshops. So I submitted “Snapping like hell(sworth)”, renamed to “Your app everywhere, just in a Snap!” (the original name of the whole workshop series) on the Linux App Summit 2023 in Brno, the GUADEC 2023 in Riga, and the Ubuntu Summit 2023 in Riga, the latter 2 together with Heather. Only on the GUADEC it got accepted, but due to lack of audience I could not actually give it.

But I have also organized my own conference this year, the Opportunity Open Source in the Indian Institute of Technology (IIT) Mandi in northern India. And there, after having done a quick pre-check, finding out that the 3 other employees of Canonical who also attended are interested and so I had an assured base audience, I actually gave it, but only the first half, as time restrictions only gave me a 60-min slot. I got a total audience of 12, what was very good, probably several got motivated by my talk introducing into Snap (video, slides).

And finally I got the opportunity to give the workshop (video, slides) in its entirety on Canonical’s internal Engineering Sprint, which happened in the week after the Ubuntu Summit 2023, also in Riga. Having ~700 engineers from Canonical on the event it was easy to get a significant audience, actually around 25 to 30 people showed up to get great snappers. And as there are only Canonical people, everyone had a suitable Ubuntu version on their laptop where they could install snapcraft and do the exercises. Nobody needed the virtual machine (~6 GB) which I have prepared already before the GUADEC. And so I found out how long the complete workshop actually takes. I made it in 2:10 hours.

And on the Ubuntu Summit 2023 I actually got accepted for a Snap workshop, but for a more advanced one, “Improving Snap maintenance: Automating tag updates on new upstream releases of the app” (video, slides). I originally submitted it together with Heather, who originally created the update automation, but as she left Canonical, she was not on the Summit and I had to replace her by Jesús Soto.

Some people were complaining that we had no beginner’s workshop for Snap on this year’s Summit. We are looking into fixing this in 2024 …

So together with the “Daemon Snapper’s Workshop” (slides) I have now a repertoire of 3 (see below) and I will continue to give them on conferences and Engineering Sprints.

Update: Now on snapcraft.io

As one can easily also do these workshops by oneself at home, studying the slide decks and trying out the linked examples, the slides and examples should be made available on a place in the internet where interested people can easily find them.

Therefore I have posted this section with all the links to slides, examples, and videos on the snapcraft.io Forum in the “doc” category. In addition I have pinned the post to keep it prominently visible.

Thanks to Graham Morrison, responsible for Snap documentation at Canonical, for his support.

We also plan to put everything onto a GitHub repo.

And this will not only help to learn snapping, also everyone who likes to give a Snap workshop on a conference by himself could make use of these materials.

CPDB CUPS backend Snap

On the snapcraft.io forum thread where I asked for help with the problems I talked about here last month a conversation with James Henstridge from Canonical’s Desktop Team started.

I have explained how CPDB exactly works, how it finds the available backends and how it communicates with them during the print dialog session in order to actually print a job. He also brought up some security concerns and I told him how we address them.

Especially we found out that CPDB needs some changes:

  1. The printFile method of backends needs to pass the job data as stream (file descriptor or domain socket), not as file specified by a file path.
  2. The D-Bus methods getActiveJobsCount, getAllJobs, and cancelJob need to get removed from CPDB
  3. The file backend of CPDB cannot be used. We should discontinue its development and tell that it is for development and documentation only.
  4. Filtering of the printer list in the dialog should be completely managed by the frontends, and not by sending signals to the backends, to allow different filtering on print dialogs which are open to the same time.
  5. Add newly appearing backends while the dialog is open.

Suggestions about how to make CPDB acually work with Snap were not made.

I have asked Biswadeep to work on these changes and he will do so in December after his end-semester exams.

PAPPL 1.4.3

PAPPL v1.4.3 is now available for download and is a bug fix release. Changes include:

  • Added “smi55357-device-uri” and “smi55357-driver” Printer Status attributes to Get-Printer-Attributes responses.
  • Fixed missing mutex unlock in DNS-SD code (Issue #299)
  • Fixed “printer-id” value for new printers (Issue #301)
  • Fixed DNS-SD device list crash (Issue #302)
  • Fixed Set-Printer-Attributes for “output-bin-default” and “sides-default” (Issue #305)
  • Fixed default “copies” value with papplJobCreateWithFile().

Updated:

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