Hi all, I attended PWG virtual meetup 2021 yesterday and today and created reported about it. Highlights: - CUPS got into OpenPrinting group from Apple - still working on upgrade path for non-driverless printers after removing printer drivers and raw queues: 1) printer application library was created - PAPPL (already in Fedora) 2) the first printer application library created by Till Kamppeter - ps-printer-app - which supports postscript printers in the wild - ippusbxd is dead for ipp-over-usb standard - standard for driverless printing via usb [1] - we use ipp-usb (already in Fedora, how to find out my device is supported [2]) [1] https://fedoraproject.org/wiki/How_to_debug_printing_problems#Driverless_printing_.28USB.29 [2] https://fedoraproject.org/wiki/How_to_debug_printing_problems#How_to_find_out_if_my_USB_device_supports_IPP_over_USB ========================================================================== -- Zdenek Dohnal Software Engineer Red Hat Czech - Brno TPB-C
PWG 2021 ======== PWG Plenary ----------- - 692 printers IPP Everywhere certified! https://www.pwg.org/printers/ - standards - IPP Everywhere 2.0 on the way, IPP Enterprise Printing Extensions 2.0, IPP Production Printing Extensions 2.0, IPP driverless printing extensions 2.0 etc. - IDS (Image Device Security) - now focus on hard copy devices protection profiles, hard copy devices security guidelines and standards - IPP - maintenance of the protocol and SNMP MIBs - recently published Job Accounting with IPP v1.0, in working IPP 2.0 (fourth edition), IPP driverless printing extensions 2.0, IPP encrypted jobs and documents 1.0, IPP enterprise printing extensions 2.0, IPP finishings 3.0, IPP production printing extensions 2.0 - pending IANA registrations https://www.pwg.org/ipp/ipp-registrations.xml - 3D printing - reaching 3D printer manufacturers about IPP to convince them to use IPP instead of drivers OpenPrinting Plenary -------------------- - linux markets - windows lost to linux in public server market share, web server market share - linux distro popularity on distrowatch - 5th Fedora, 7th CentOS - cups-filters - highlights - clustering, dns-sd enhancing, filters - cups in SNAP - no drivers, working out of the box - participated in GSOC, GSOD abd LFMP (Linux Foundation Mentorship Program) - took over CUPS, released 2.3.3op1 and 2.3.3op2, working on 2.4.x - pappl - recent v1.0.3, written by Mike Sweet, library for printer applications - ps-printer-app - the first printerapp for postscript printers, written by Till Kamppeter - driverless - IPP Faxout support implemented in cups-filters - ipp over usb - ippusbxd removed, now we use ipp-usb written in Golang - scanning - Mopria released eSCL specification publicly, IPP scan service isn't supported by devices, so we go with eSCL and WSD - GSoC 2021 - halfed hours for projects, now only 5 students for us - GSoD 2021 - more complicated than before (legal stuff, payments to tech writer)... - cups-filters docs wasn't accepted - LFMP 2021 - currently considering projects which will go into LFMP - only technical projects (no bug fixing, maintenance, web creation, docs) GSOC, GSOD, LFMP updates ------------------------ - 2020 - CPDB and IPP scan projects weren't completed, but other students works on bugs in printer applications and cups-filters - LFMP 2020 - 4 students, none of them finished because LFMP started when universities in India started to have classes, so students were busy - GSoC 2021 - topics - create a single universal filter - firmware and other file handling in PAPPL - GUI for listing and managing available IPP Print/Scan services - modern IPP printers will be as IPP services, and printer applications will be drivers - converting filters to functions instead of executables - all filters must work without PPD files - coding period is reduced to half :( CUPS Plenary ------------ - future 2.4 - working on oauth 2.0 instead of kerberos, added compatibility with airprint and mopria (already done), added pkg-config support, kerberos and cups-config deprecated, snapcraft support mostly done, working on job-sheets-col and media-col (like using different output trays without postscript commands), working on TLS and X.509 (bringing OpenSSL back as an option, better X509 for servers - sharing certificates between devices instead of locally generated self-signed certs) - oauth - don't need root, Mike uses its own version - moauth, bearer and refresh tokens cached per-user/auth-server, asking for OAUTH server already implemented in IPP protocol - deprecations: - already removed in past: - due security issues - moving directives to cups-files.conf, interface script - performance and design issues - CUPS browsing (removed mainly because of wifi) - deprecated, will go away in the future: - printer drivers - now we can use standards instead of drivers - raw queues - kerberos - cups-config - future 3.0 after 2.4.0 - user apps + CUPS + printer (or printer app + printer) - splitting - cupsd into 2 parts (one for local, second for sharing) - local server - communication with printers and its discovery, AAA, converting files for printer, no web UI, can configure printers outside of LAN - profiles, have dbus - sharing server - have web ui, accounting, configuration as current cups, oauth support, ACLs, communications with printers Printer applications -------------------- - replacement for printer drivers - options replaced by IPP - it's IPP everywhere printer implementation, compatible with cups 1.4 and later - support for PWG Raster plus JPEG for color printers - pappl - library for printer applications supports jpeg, png, pwg raser, apple raster, raw printing via usb and network - works with airprint, IPP everywhere, Mopria - ipp-usb support, disabling TLS - API - see manual - five main objects - system (IPP system service, has web ui), clients, devices (manage printer connections), printers (manage printers), jobs (manage jobs) - IPP system service in PAPPL - support old USB, USB serial, IPP-USB, listen on TCP/IP or domain sockets, logging to file/systemd, resources can be dynamic or static (from files) - can be printer or system specific - client - created by system, for connections - support auth, html forms, default page header and footer - device - handles communication with printer - the same as in cups - socket://IP, file://tmp, snmp, usb, dnssd - no IPP (obviously) and no LPD - printer - implements IPP everywhere and some extensions, connected to device and uses driver to process document data - driver has a required raster interface to support apple or pwg raster, optionally raw (ZPL/EPL), and other formats (JPEG and PNG already in, PDF can be done) - job - it is job object in IPP model - PWG and Apple rasters are streamed (because they are big and can influence your memory), others formats are spooled - so printer can take only one Apple/PWG raster job at time (for others it returns 'busy'), other formats aren't limited - mainloop api - provides web ui and command line commands - like 'drivers', 'devices', '-d printer -o option=valuie filename', 'options -d printer' - lprint - support for label printers - gutenprint printer application - GSoC student worked on this, but currently no results - postscript printer application - for standard A4/Letter office printers, retrofitting printer application (uses PPD inside) based on pappl, pa for high level vector graphics output formats, works for postscript printers - autoassign PPD to make/model from device ID, associate standard options with IPP attrs, modifies printing defaults based on your installed stuff - user can add his PPD - runs checks from libppd on it (PPD can be rejected) and prefers the PPD when autoassigning to printer, can be removed - future - human readable for vendor options, localization, ink level check, creating library for other retro-fitting printer applications Openprinting - cups-filters --------------------------- - filters now called as functions and not just a special binary - now works with PPD, in the future with IPP job/printer attributes - new pclmtoraster filter - planned one generic filter for all conversion (GSoC) Openprinting - libppd --------------------- - ppd file handling library for retro fitting classic drivers - taken from libcups, because it is deprecated there - don't use it in for new drivers! Openprinting - driverless utility -------------------------------- - now supports IPP Fax Out - shows Fax ppds in printer setup tools, support for IPPs and DNS-SD-service-name-based URIS Openprinting - cups-browsed --------------------------- - multithreaded now, can keep queues installed even when cups-browsed is stopped Openprinting - cups-filters future ---------------------------------- - license change to Apache 2.0 + (L)GPL2 in 2.0, cups-browsed in separate project, libqpdf dependency will be optional (no pdftopdf filter) OpenPrinting - CUPS in SNAP -------------------------- - no support for classic drivers - all printer applications, sorting out snap related stuff, available on snap store https://snapcraft.io/cups - three run modes - standalone (only snap cups), proxy (classic cups + snap cups - snap clones the queues and acts as a proxy), parallel (debug mode from config switch) - cups listens on snap's domain socket and apps prints on it (for proxy and parallel modes), snap in standalone mode listens on both domain sockets - /run/cups/cups.sock and snap one - all command line tools and cups-browsed (for now) - security concept - when snap is connected, it uses only safe interfaces, 'dangerous' are off, can be connected manually - so for cups there are two interfaces - cups and cups-control Openprinting - printer applications ----------------------------------- - pappl and ps-printer-app we talk about - planning to convert hplip, splix, foo2zjs to printer apps - for unmaintained - they will be wrapped into printer application Openprinting - driverless scanning --------------------------------- - 3 standard protocols - IPP scan, eSCL, WSD - we support eSCL and WSD in sane-airscan - eSCL works with ipp-over-usb (ipp-usb) - we will try sandbox scanners - current sane-backends cannot be used, so they need to be scanner applications - scan support maybe in pappl in the future Openprinting - ipp-usb ---------------------- - ippusbxd no more, long live ipp-usb! Openprinting - GUIs ------------------- - CPDB - has dbus interface, so can it be used in GTK? - printer setup tool - will show IPP services for IPP devices - printer wizard for nondriverless, which will offer printer applications
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