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Bug#1013437: cups: Nothing prints from driverless IPP queues unless added via lpadmin

On Sat  2 Jul 2022, at 23:43, Brian Potkin <claremont102@gmail.com> wrote:
[...]
> On Fri 01 Jul 2022 at 13:37:07 +0100, Gareth Evans wrote:
>> Driverless queues don't seem to work
>> no matter how set up.
>
> Yet earlier (and at OpenPrinting) you said:
>
>   Having deleted all printers from system-config-printer,
>   $ sudo lpadmin -p testq -v ipp://192.168.0.14/ipp/print -E -m 
> driverless:ipp://192.168.0.14/ipp/print
>   now succeeds, and so does printing to it.

Apologies, driverless queues only work if set up by lpadmin.
Everywhere queues work from cups-web.

May I suggest you may not be able to reproduce the bug as you (said you) don't have a fax-capable printer?  

It seems to me that my driverless print jobs end up in a fax queue if the queue is created by cups-web or s-c-p.  If this is the main symptom, I would be grateful if you would advise if this changes what the bug should be reported against.

I respect that you may no longer wish to be involved with this issue - thanks for your help - here is some further info for info's sake :)

At least one other user seems to have a similar problem:

"However, printing does not work, although the printer gets data, but then hangs."
https://lists.debian.org/debian-user/2022/06/msg00558.html

The printer concerned there also appears to have airprint/fax
https://productz.com/en/samsung-xpress-sl-c480fw/p/wxnG7

Substituting "gives up" for "hangs", this reflects my issue too.

I can find no significant difference between driverless PPDs, though everywhere PPDs do not include fax details, and everywhere queues added from cups-web succeed in printing.  Might this be another pointer to the issue?

$ history | grep testq-drvless
sudo lpadmin -p testq-drvless -v ipp://192.168.0.14/ipp/print -E -m driverless:ipp://192.168.0.14/ipp/print

$  sudo cat testq-drvless.ppd | grep -i fax
*NickName: "Brother MFC-L2740DW series, Fax, driverless, cups-filters 1.28.7"
*cupsIPPFaxOut: True
*OpenUI *faxPrefix/Pre-Dial Number: PickOne
*OrderDependency: 10 AnySetup *faxPrefix
*DefaultfaxPrefix: None
*faxPrefix None: ""
*CloseUI: *faxPrefix
*CustomfaxPrefix True: ""
*ParamCustomfaxPrefix Text: 1 string 0 64

$ history | grep ippeve
sudo lpadmin -p testq-ippeve -v ipp://192.168.0.14/ipp/print -E -m everywhere

$ sudo cat testq-ippeve.ppd | grep -i fax
$ 


Though even testq-drvless sometimes shows strange job attribs in s-c-p: 

"job-printer-state-message: Phone number for fax not valid! Fax cannot be sent"
"job-printer-uri: ipp://localhost/printers/testq-drvless"

though the job (from geany) actually printed.  


$ sudo diff CUPSWEBDL.ppd testq-drvless.ppd
20c20
< *APSupplies: "http://mfcl2740dw.local./net/net/airprint.html";
---
> *APSupplies: "http://192.168.0.14/net/net/airprint.html";

$ sudo diff CUPSWEBDL.ppd SCPDL.ppd
$

$ ping mfcl2740dw.local
PING mfcl2740dw.local (192.168.0.14) 56(84) bytes of data.
64 bytes from 192.168.0.14 (192.168.0.14): icmp_seq=1 ttl=255 time=9.80 ms

$ ping mfcl2740dw.local.
PING mfcl2740dw.local. (192.168.0.14) 56(84) bytes of data.
64 bytes from 192.168.0.14 (192.168.0.14): icmp_seq=1 ttl=255 time=3.62 ms

$ sudo lpadmin -p testqhostname -v ipp://mfcl2740dw.local/ipp/print -E -m driverless:ipp://mfcl2740dw.local/ipp/print 
lpadmin: Printer drivers are deprecated and will stop working in a future version of CUPS.

$ sudo diff testqhostname.ppd CUPSWEBDL.ppd
$ 


$ lp -d testqhostname /etc/nsswitch.conf
request id is testqhostname-56 (1 file(s))

Succeeds.

/var/log/cups/error_log
[...]
2833 D [03/Jul/2022:02:05:45 +0100] Create-Job ipp://localhost/printers/testqhostname
[...]
3359 D [03/Jul/2022:02:05:46 +0100] [Client 605] Processing GET /printers/testqhostname.ppd
3360 D [03/Jul/2022:02:05:46 +0100] [Client 605] filename="/etc/cups/ppd/testqhostname.ppd", type=application/vnd.cups-ppd
[...]
3794 D [03/Jul/2022:02:05:47 +0100] [Job 56] job-uri uri ipp://mfcl2740dw.local:631/ipp/print/job-225
3805 D [03/Jul/2022:02:05:47 +0100] [Job 56] printer-uri uri ipp://mfcl2740dw.local:631/ipp/print


$ lp -d CUPSWEBDL /etc/nsswitch.conf
request id is CUPSWEBDL-55 (1 file(s))

Fails.

/var/log/cups/error_log
[...]
70 D [03/Jul/2022:02:04:51 +0100] Create-Job ipp://localhost/printers/CUPSWEBDL
[from line 1349]
71 D [03/Jul/2022:02:04:55 +0100] [Client 581] Processing GET /printers/CUPSWEBDL.ppd
72 D [03/Jul/2022:02:04:55 +0100] [Client 581] filename="/etc/cups/ppd/CUPSWEBDL.ppd", type=application/vnd.cups-ppd
[...]
1495 D [03/Jul/2022:02:04:56 +0100] [Job 55] job-uri uri ipp://mfcl2740dw.local:631/ipp/faxout/job-224
1506 D [03/Jul/2022:02:04:56 +0100] [Job 55] printer-uri uri ipp://mfcl2740dw.local:631/ipp/faxout


lpstat -t shows cups-web created devices as:

device for CUPSWEBDL: ipp://Brother%20MFC-L2740DW%20series._ipp._tcp.local/

vs

device for testq-drvless: ipp://192.168.0.14/ipp/print
device for testq-ippeve: ipp://192.168.0.14/ipp/print

- does the ipp:// string come from Avahi for cups-web created queues?  That's the only place I can find that value:

$ avahi-browse -a
<snip>
+ wlp1s0 IPv4 Brother MFC-L2740DW series                    Web Site             local
+ wlp1s0 IPv4 Brother MFC-L2740DW series                    _scanner._tcp        local
+ wlp1s0 IPv4 Brother MFC-L2740DW series                    Internet Printer     local
+ wlp1s0 IPv4 Brother MFC-L2740DW series                    UNIX Printer         local
+ wlp1s0 IPv4 Brother MFC-L2740DW series                    PDL Printer          local
<snip>

 
Also this error is common:

$ lpstat -t
scheduler is running
system default destination: SCPDL
device for Brother_MFC_L2740DW_series: implicitclass://Brother_MFC_L2740DW_series/
device for CUPSWEBDL: ipp://Brother%20MFC-L2740DW%20series._ipp._tcp.local/
<snip>
Brother_MFC_L2740DW_series accepting requests since Mon 27 Jun 2022 22:25:06 BST
<snip>
printer Brother_MFC_L2740DW_series disabled since Mon 27 Jun 2022 22:25:06 BST -
	No destination host name supplied by cups-browsed for printer            "Brother_MFC_L2740DW_series", is cups-browsed running? 
<snip>


$ sudo service cups-browsed status
● cups-browsed.service - Make remote CUPS printers available locally
     Loaded: loaded (/lib/systemd/system/cups-browsed.service; enabled; vendor preset: enabled)
     Active: active (running) since Sun 2022-07-03 00:27:22 BST; 2h 26min ago
   Main PID: 2860 (cups-browsed)
      Tasks: 3 (limit: 14146)
     Memory: 2.3M
        CPU: 208ms
     CGroup: /system.slice/cups-browsed.service
             └─2860 /usr/sbin/cups-browsed

Jul 03 00:27:22 qwerty systemd[1]: Started Make remote CUPS printers available locally.

Best wishes,
Gareth
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