Printer configuration
Dear Guix, Could you help me get my printer working? I setup my cups service: ... (use-modules ... (gnu packages cups) ...) (use-service-modules ... cups ...) ... (service cups-service-type (cups-configuration (extensions (list hplip-minimal cups-filters splix)) (server-name host-name) (host-name-lookups #t) (web-interface? #t))) ... Then I reconfigured my system and restarted. Now I can access the CUPS page on localhost:631. However, I could not figure out that interface for the life of me. Instead, I found out I could install the `system-config-printer' package which provided a setup utility that actually made sense, giving me hope of falling into a "pit of success". It detected my printer, great! Unfortunately, it failed to print a test page, popping up a warning box with the text: Printer 'SCX-4200' requires the '/gnu/store/.../cups/filter/rastertoqpdl' program but it is not currently installed. I'm not sure what to do now. Thanks in advance for any suggestions on how to resolve this. Best Regards, Kyle
Re: Printer configuration
Kyle Andrews writes: > Dear Guix, > > Could you help me get my printer working? > > I setup my cups service: > > ... > (use-modules ... >(gnu packages cups) > ...) > (use-service-modules ... cups ...) > ... > (service cups-service-type > (cups-configuration > (extensions >(list hplip-minimal cups-filters splix)) > (server-name host-name) > (host-name-lookups #t) > (web-interface? #t))) > ... > > Then I reconfigured my system and restarted. Now I can access the CUPS > page on localhost:631. However, I could not figure out that interface > for the life of me. Instead, I found out I could install the > `system-config-printer' package which provided a setup utility that > actually made sense, giving me hope of falling into a "pit of > success". It detected my printer, great! Unfortunately, it failed to > print a test page, popping up a warning box with the text: > > Printer 'SCX-4200' requires the '/gnu/store/.../cups/filter/rastertoqpdl' > program but it is not currently installed. > > I'm not sure what to do now. Thanks in advance for any suggestions on > how to resolve this. > > Best Regards, > Kyle After sending I realized there were two pieces of information I forgot to include that might be of interest towards diagnosing the difficulty: 1.) The printer is a SCX-4200 and is listed as working on openprinting.org. 2.) the slice of the error message I showed was incomplete: the guix package where rastertoqpdl is being searched for is in cups, yet the tool is clearly available in the splix package. Why is system-config-printer looking in the wrong package? How can I make the service see both? Thanks, Kyle
Re: Printer configuration
On Thu, Jun 25, 2020 at 10:11:36PM -0400, Kyle Andrews wrote: > (use-modules ... >(gnu packages cups) > ...) > (service cups-service-type > (cups-configuration > (extensions >(list hplip-minimal cups-filters splix)) > (server-name host-name) > (host-name-lookups #t) > (web-interface? #t))) Hi Kyle, Just a wild guess, but how about declaring cups and splix in the `packages` part of your config.scm? WŻ signature.asc Description: PGP signature
Re: Printer configuration
Wiktor Żelazny writes: > On Thu, Jun 25, 2020 at 10:11:36PM -0400, Kyle Andrews wrote: > >> (use-modules ... >> (gnu packages cups) >> ...) > >> (service cups-service-type >> (cups-configuration >> (extensions >> (list hplip-minimal cups-filters splix)) >> (server-name host-name) >> (host-name-lookups #t) >> (web-interface? #t))) > > Hi Kyle, > > Just a wild guess, but how about declaring cups and splix in the > `packages` part of your config.scm? > > WŻ Thanks for the suggestion, WZ! I gave it a shot adding cups and splix into my default packages. Unfortunately, even after completely restarting the computer I observed no change in the error I get when trying to print a test page.
Re: Printer configuration
On Fri, Jun 26, 2020 at 12:56:08PM -0400, Kyle Andrews wrote: > I observed no change in the error I get when trying to print a test > page. Does /gnu/store/.../cups/filter/rastertoqpdl exist? Is the user printing the test page a member of the lp group (lpadmin might also help)? WŻ signature.asc Description: PGP signature
Re: Printer configuration
Wiktor Żelazny writes: > On Fri, Jun 26, 2020 at 12:56:08PM -0400, Kyle Andrews wrote: > >> I observed no change in the error I get when trying to print a test >> page. > > Does /gnu/store/.../cups/filter/rastertoqpdl exist? > > Is the user printing the test page a member of the lp group (lpadmin > might also help)? > > WŻ Hi WZ, Thanks for following up. > Does /gnu/store/.../cups/filter/rastertoqpdl exist? Yes, it exists in the splix package, but not in the cups package. Looking at the Guix source code I saw that ~system-config-printer~ (in ~guix/gnu/packages/gnome.scm~) takes input from cups on build, but not from splix or other print drivers. Could that be part of the problem? > Is the user printing the test page a member of the lp group (lpadmin > might also help)? The user is in the lp group. I didn't know about lpadmin. I will add that group as well and see if it changes anything. The CUPS localhost page was behaving strangely (stalling on load) when I tried to click the administration tab. Thanks for the tip! Kyle
Re: Printer configuration
On Fri, Jun 26, 2020 at 02:13:14PM -0400, Kyle Andrews wrote: > > Wiktor Żelazny writes: > > > Does /gnu/store/.../cups/filter/rastertoqpdl exist? > > Yes, it exists in the splix package, but not in the cups package. > Looking at the Guix source code I saw that ~system-config-printer~ (in > ~guix/gnu/packages/gnome.scm~) takes input from cups on build, but not > from splix or other print drivers. Could that be part of the problem? I wouldn’t be surprised. On the other hand, it does not import other extensions, such as hplip and foomatic-filters, either. Did you run guix system reconfigure after adding the packages to config.scm? Did you try removing and adding the printer again afterwards? Does a /var/guix/profiles/system/profile/lib/cups/filter/rastertoqpdl symlink exist in your filesystem? I think you could try changing the rastertoqpdl path defined in the system-config-printer configuration (or CUPS configuration, assuming it’s just a CUPS GUI frontend) from /gnu/store/… to that path. /gnu/store/ contents are volatile. Again, just guessing; perhaps the path is hardcoded into the CUPS/splix build and uneditable. WŻ signature.asc Description: PGP signature
Re: Printer configuration
Kyle, I'd strongly recommend using the ‘real’ CUPS interface at localhost:631 over any third-party helper, but… Kyle Andrews 写道： The CUPS localhost page was behaving strangely (stalling on load) when I tried to click the administration tab. I can confirm that the Administration tab freezes on my laptop and print server (CUPS proxied through nginx). That's new :-/ I'll report a bug for that. Thanks, T G-R signature.asc Description: PGP signature
Re: Printer configuration
Wiktor Żelazny writes: > On Fri, Jun 26, 2020 at 02:13:14PM -0400, Kyle Andrews wrote: >> >> Wiktor Żelazny writes: >> >> > Does /gnu/store/.../cups/filter/rastertoqpdl exist? >> >> Yes, it exists in the splix package, but not in the cups package. >> Looking at the Guix source code I saw that ~system-config-printer~ (in >> ~guix/gnu/packages/gnome.scm~) takes input from cups on build, but not >> from splix or other print drivers. Could that be part of the problem? > > I wouldn’t be surprised. On the other hand, it does not import other > extensions, such as hplip and foomatic-filters, either. > > Did you run guix system reconfigure after adding the packages to > config.scm? Did you try removing and adding the printer again > afterwards? > > Does a /var/guix/profiles/system/profile/lib/cups/filter/rastertoqpdl > symlink exist in your filesystem? I think you could try changing the > rastertoqpdl path defined in the system-config-printer configuration (or > CUPS configuration, assuming it’s just a CUPS GUI frontend) from > /gnu/store/… to that path. /gnu/store/ contents are volatile. Again, > just guessing; perhaps the path is hardcoded into the CUPS/splix build > and uneditable. > > WŻ Hi WZ, > Did you run guix system reconfigure after adding the packages to > config.scm? Did you try removing and adding the printer again > afterwards? I did reconfigure, but I didn't try removing and adding the printer again. > Does a /var/guix/profiles/system/profile/lib/cups/filter/rastertoqpdl > symlink exist in your filesystem? I think you could try changing the > rastertoqpdl path defined in the system-config-printer configuration (or > CUPS configuration, assuming it’s just a CUPS GUI frontend) from > /gnu/store/… to that path. /gnu/store/ contents are volatile. Again, > just guessing; perhaps the path is hardcoded into the CUPS/splix build > and uneditable. It does appear to exist. Actually, I figured out how to successfully print a document using ~libreoffice --headless -p test.odt~. So, I think my printer problem is actually reflecting a problem with system-config-printer. Kyle
Re: Printer configuration
On Fri, Jun 26, 2020 at 06:12:23PM -0400, Kyle Andrews wrote: > I figured out how to successfully print a document using ~libreoffice > --headless -p test.odt~. So, I think my printer problem is actually > reflecting a problem with system-config-printer. Or perhaps the difference is that that print job did not have to involve rastertoqpdl. Have you tried something like lpr a-simple-text-file.txt ? Of course, I second Tobias in advising you to try localhost:631. CUPS may figure out some smart configuration for you. Good luck, WŻ signature.asc Description: PGP signature
Re: Printer configuration
Wiktor Żelazny writes: > On Fri, Jun 26, 2020 at 06:12:23PM -0400, Kyle Andrews wrote: > >> I figured out how to successfully print a document using ~libreoffice >> --headless -p test.odt~. So, I think my printer problem is actually >> reflecting a problem with system-config-printer. > > Or perhaps the difference is that that print job did not have to involve > rastertoqpdl. Have you tried something like > >lpr a-simple-text-file.txt > > ? > Yes, I did. That worked too! > Of course, I second Tobias in advising you to try localhost:631. CUPS > may figure out some smart configuration for you. I was able to print a test page through the CUPS web interface as well. So, this further points to system-config-printer being buggy. > Good luck, > > WŻ Thanks for all your help. Kyle
Printer configuration failed due to missing filters
Hi Guix! I am currently trying to configure my Epson printer on Guix system using system-config-printer. The printer is connected via USB and is automatically detected in the dialog window that opens if I click on "Add". I select the printer from the list and click on "Forward", then I enter the printer name, a description and a location in the section "Describe Printer". However, if I click on "Apply", the following error message is printed: > Printer 'EPSON-...' requires the > '/gnu/store/...-cups-2.3.3/lib/cups/filter/epson-escpr-wrapper', > program but it is not currently installed. Please install it before > using this printer. The printer is added but trying to print a test page yields: ‘CUPS server error. There was an error during the CUPS operation: ’No such file or directory’.’ According to the Guix manual, the epson-escpr filter should be installed by default when using the cups-service-type. Nevertheless, I also made it explicit in my system configuration: --8<---cut here---start->8--- (service cups-service-type (cups-configuration (extensions (list cups-filters epson-inkjet-printer-escpr --8<---cut here---end--->8--- Looking in the system profile I cannot find it: ‘find /run/current-system/profile -name "epson-escpr-wrapper"’ shows no results. There is also no cups directory under /run/current-system/profile/lib. Am I missing something? Since I am running Gnome, I also tried to configure the printer using gnome-control-center. However, here the error message is not so detailed. It just says: ‘Failed to add new printer’. I think this is an issue specific to Guix because the printer works with other Linux distros. Best Daniel
Re: Printer configuration failed due to missing filters
Daniel! Daniel Meißner 写道： Printer 'EPSON-...' requires the '/gnu/store/...-cups-2.3.3/lib/cups/filter/epson-escpr-wrapper', program but it is not currently installed. Please install it before using this printer. Interesting here is that it's looking in …-cups-2.3.3 where I believe it should look in …-cups-server-bin instead. The former is merely the upstream CUPS package, whilst the latter is a union of CUPS with its extensions (drivers). Can you confirm that the file printed by $ ps auxwww | grep -o '/gnu/store/[^ ]*cups-files.conf' contains DataDir /gnu/store/…-cups-server-bin/share/cups ServerBin /gnu/store/…-cups-server-bin/lib/cups ? You should find lib/cups/filter/epson-escpr-wrapper under this ServerBin. Looking in the system profile I cannot find it: ‘find /run/current-system/profile -name "epson-escpr-wrapper"’ shows no results. There is also no cups directory under /run/current-system/profile/lib. Am I missing something? Just that there's no reason for epson-escpr-wrapper to be anywhere in /run/current-system in the first place. It should be in the union directory I mentioned above, and CUPS should find it there. I don't currently have access to an Epson printer, but I'll try to add one anyway. See if you can divine any useful chunks from the puddle of vomit that CUPS produces when configured with: (cups-configuration … (log-level 'debug2) …) There's also (access-log-level 'all) but it's probably not relevant here. Kind regards, T G-R signature.asc Description: PGP signature
Re: Printer configuration failed due to missing filters
Tobias Geerinckx-Rice 写道： Interesting here is that it's looking in …-cups-2.3.3 where I believe it should look in …-cups-server-bin instead. Specifically through the standard $PATH mechanism: … envp[10]="PATH=/gnu/store/…-cups-server-bin/lib/cups/filter:…" … (from /var/log/cups/error_log). Kind regards, T G-R signature.asc Description: PGP signature
Re: Printer configuration failed due to missing filters
Hi Tobias! Thank you for responding promptly. > Can you confirm that the file printed by > > $ ps auxwww | grep -o '/gnu/store/[^ ]*cups-files.conf' > > contains > > DataDir /gnu/store/…-cups-server-bin/share/cups > ServerBin /gnu/store/…-cups-server-bin/lib/cups > > ? Affirmative, this file contains those two lines. > You should find lib/cups/filter/epson-escpr-wrapper under this > ServerBin. Aha! Yes, it is there, indeed. >> Looking in the system profile I cannot find it: ‘find >> /run/current-system/profile -name "epson-escpr-wrapper"’ shows no >> results. There is also no cups directory under >> /run/current-system/profile/lib. Am I missing something? > > Just that there's no reason for epson-escpr-wrapper to be anywhere > in /run/current-system in the first place. It should be in the > union directory I mentioned above, and CUPS should find it there. I see, I am very new to Guix, so I don't know the internals of Guix really. I naively assumed that I should find it in the system profile. > I don't currently have access to an Epson printer, but I'll try to > add one anyway. That'd be awesome, thank you. > See if you can divine any useful chunks from the puddle of vomit > that CUPS produces when configured with: > > (cups-configuration > … > (log-level 'debug2) > …) > > There's also (access-log-level 'all) but it's probably not > relevant here. Thanks for the hints, I will try to destill something from the logs. Best Daniel
Re: Printer configuration failed due to missing filters
Daniel, Daniel Meißner 写道： I am currently trying to configure my Epson printer on Guix system using system-config-printer. The printer is connected via USB and is automatically detected in the dialog window that opens if I click on "Add". I select the printer from the list and click on "Forward", then I enter the printer name, a description and a location in the section "Describe Printer". However, if I click on "Apply", the following error message is printed: I was unable to reproduce this at all, albeit without an Epson USB printer connected, of course. My steps through the CUPS Web interface: - Administration - Add Printer - Internet Printing Protocol (ipp) Continue - Connection: "ipp://fake.printer/print/Print" Continue - Description, Location: "test" Share This Printer unticked Continue - Make: Epson Continue - Model: EPSON ET-2600 Series , Epson Inkjet Printer Driver (ESC/P-R) for Linux (…) - Then accept all default options. Result attached. At no point do I get an error. Interestingly, my CUPS only ever looks in the right location for epson-escpr-wrapper: --8<---cut here---start->8--- λ grep escpr-wrapper -a /var/log/cups/error_log d [03/Dec/2021:00:17:28 +0100] add_printer_filter(p=0x64654c639bd0(test), filtertype=0x64654c5b7ca0(printer/test), filter="application/vnd.cups-raster 0 epson-escpr-wrapper") d [03/Dec/2021:00:17:28 +0100] test: File \"/gnu/store/bmb3hz0a4k5a51bb5w7lxlc766d1hcv3-cups-server-bin/lib/cups/filter/epson-escpr-wrapper\" permissions OK (040555/uid=0/gid=0). d [03/Dec/2021:00:17:28 +0100] add_printer_filter: test: adding filter application/vnd.cups-raster printer/test 0 epson-escpr-wrapper d [03/Dec/2021:00:17:33 +0100] add_printer_filter(p=0x64654c639bd0(test), filtertype=0x64654c5b7ca0(printer/test), filter="application/vnd.cups-raster 0 epson-escpr-wrapper") d [03/Dec/2021:00:17:33 +0100] test: File \"/gnu/store/bmb3hz0a4k5a51bb5w7lxlc766d1hcv3-cups-server-bin/lib/cups/filter/epson-escpr-wrapper\" permissions OK (040555/uid=0/gid=0). d [03/Dec/2021:00:17:33 +0100] add_printer_filter: test: adding filter application/vnd.cups-raster printer/test 0 epson-escpr-wrapper --8<---cut here---end--->8--- I can even print a test page (from the Maintenance drop-down). Of course it fails to connect to the printer, but still the filter seems to run perfectly: --8<---cut here---start->8--- λ grep escpr-wrapper -a /var/log/cups/error_log D [03/Dec/2021:00:28:45 +0100] [Job 46] epson-escpr-wrapper (application/vnd.cups-raster to printer/test, cost 0) d [03/Dec/2021:00:28:45 +0100] test: File \"/gnu/store/bmb3hz0a4k5a51bb5w7lxlc766d1hcv3-cups-server-bin/lib/cups/filter/epson-escpr-wrapper\" permissions OK (040555/uid=0/gid=0). d [03/Dec/2021:00:28:45 +0100] cupsdStartProcess: Preparing to start "/gnu/store/bmb3hz0a4k5a51bb5w7lxlc766d1hcv3-cups-server-bin/lib/cups/filter/epson-escpr-wrapper", arguments: d [03/Dec/2021:00:28:45 +0100] cupsdStartProcess: argv[8] = "/gnu/store/bmb3hz0a4k5a51bb5w7lxlc766d1hcv3-cups-server-bin/lib/cups/filter/epson-escpr-wrapper" d [03/Dec/2021:00:28:45 +0100] cupsdStartProcess(command="/gnu/store/bmb3hz0a4k5a51bb5w7lxlc766d1hcv3-cups-server-bin/lib/cups/filter/epson-escpr-wrapper", argv=0x7fffc0e0f148, envp=0x7fffc0e0fad8, infd=25, outfd=28, errfd=20, backfd=21, sidefd=23, root=0, profile=(nil), job=0x64654c5bf1b0(46), pid=0x64654c5bf2d0) = 32624 I [03/Dec/2021:00:28:45 +0100] [Job 46] Started filter /gnu/store/bmb3hz0a4k5a51bb5w7lxlc766d1hcv3-cups-server-bin/lib/cups/filter/epson-escpr-wrappe (PID 32624) D [03/Dec/2021:00:28:45 +0100] [Job 46] pdftopdf: Last filter determined by the PPD: epson-escpr-wrapper; FINAL_CONTENT_TYPE: application/vnd.cups-raster => pdftopdf will not log pages in page_log. --8<---cut here---end--->8--- So we'll need more info. Especially your printer model (I chose one at random :-) and similar debug log. Kind regards, T G-R signature.asc Description: PGP signature
Re: Printer configuration failed due to missing filters
Hi Tobias, > Daniel Meißner 写道： >> I am currently trying to configure my Epson printer on Guix system >> using system-config-printer. The printer is connected via USB and is >> automatically detected in the dialog window that opens if I click on >> "Add". I select the printer from the list and click on "Forward", >> then I enter the printer name, a description and a location in the >> section "Describe Printer". However, if I click on "Apply", the >> following error message is printed: > > I was unable to reproduce this at all, albeit without an Epson USB > printer connected, of course. Using the web-interface of CUPS I could add my printer seamlessly and even print a test page. So thanks! However, as mentioned in [1], the web interface responded super slowly which was the reason to use system-config-printer and gnome-control-center in the first place. After the fix the web-interface now runs smoothly. However, gnome-control-center still `Failed to add new printer' and system-config-printer still prints the error message I mentioned before. As before it adds the printer but refuses to print a test page saying ‘There was an error during the CUPS operation: 'No such file or directory'’. Nevertheless, I found that it is possible to print a PDF document from evince on the very same printer that I added using system-config-printer. So the problem seems to lie within system-config-printer (and not CUPS) searching the right PATH for the Epson filter. Additionally, gnome-control-center does not seem to work at all in that regard because I did not manage to add the printer with it. I am happy now since I am able to print but maybe it is worthwhile investigating this issue with gnome-control-center within the core-updates-frozen branch. Because this would be the first place to try to add printers for new Guix users that use Gnome. I would be happy to help although I can probably only try to reproduce this issue on core-updates-frozen. Best Daniel 1: https://lists.gnu.org/archive/html/help-guix/2021-12/msg00010.html
