Re: Printer configuration failed due to missing filters

[Tobias Geerinckx-Rice <me@tobias.gr>]

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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

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