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lembark
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Joined: 08 Aug 2014
Posts: 3
Location: St. Louis, MO, USA

PostPosted: Sat Sep 15, 2018 5:11 pm    Post subject: cups prints, hplip fails scanning for lack of "scanext& Reply with quote

Usual situation: I can print to an HP printer via cups but hplip cannot
access it, keeps having problems with "sanext" and "scanimage -L" or
"xsane -d hp://net/..." do not find the device.

Q: What is "scanext"?
Q: What module provides it?
Q: What module provides pythons "reportlab"?
Q: What module provides "Python Imaging Library"?

emerge --search & equery belongs gets me nada for reportlab, etc.


Bulk output:

# emerge -pv hplip; https://pastebin.com/zEasyG6i
$ emerge --info; https://pastebin.com/Es2vrUtu
# hp-check: https://pastebin.com/hAqBS606

First things: "scanner" is in the use flags, language is UTF8, printer is online at the fixed address.

Looking at a number of posts, e.g.

https://forums.gentoo.org/viewtopic-t-1063138-highlight-hplip+scanext.html
https://alioth-lists.debian.net/pipermail/sane-devel/2009-February/024117.html

I've checked and LANG & LC_ALL are both utf8:

$ echo "'$LANG' '$LC_ALL'";
'en_US.UTF-8' 'en_US.UTF-8'

Checking /etc/sane.d/dll.conf:

# Add support for the HP-specific backend. Needs net-print/hplip installed.
hpaio

and net.conf has the address:

172.16.1.9

CUPS config for the printer:

Color (Idle, Accepting Jobs, Not Shared, Server Default)
Description: Color
Location: Office
Driver: HP LJ 300-400 color MFP M375-M475 Postscript (recommended) (color, 2-sided printing)
Connection: hp:/net/HP_LaserJet_400_colorMFP_M475dw?ip=172.16.1.9
Defaults: job-sheets=none, none media=na_letter_8.5x11in sides=two-sided-long-edge


the "hp:/net/HP_..." seems reasonable. I've tried removing the "HP_",
adding it back without any effect.

I can access the printers config web page via http://172.16.1.9 so the
beast is online at that address.

hplip & plugins are installed:
Code:

*  net-print/hplip
    Latest version available: 3.18.6
    Latest version installed: 3.18.6
    Size of files: 22,070 KiB
    Homepage:      https://developers.hp.com/hp-linux-imaging-and-printing
    Description:   HP Linux Imaging and Printing - Print, scan, fax drivers and service tools
    License:       GPL-2

*  net-print/hplip-plugin
    Latest version available: 3.18.6
    Latest version installed: 3.18.6
    Size of files: 2,018 KiB
    Homepage:      https://developers.hp.com/hp-linux-imaging-and-printing
    Description:   Proprietary plugins and firmware for HPLIP
    License:       hplip-plugin


along with sane backends:
Code:

*  media-gfx/sane-backends
    Latest version available: 1.0.27-r1
    Latest version installed: 1.0.27-r1
    Size of files: 6,280 KiB
    Homepage:      http://www.sane-project.org/
    Description:   Scanner Access Now Easy - Backends
    License:       GPL-2 public-domain


Example from scanimage:

$ scanimage -d hp:/net/HP_LaserJet_400_colorMFP_M475dw?ip=172.16.1.9;
scanimage: open of device hp:/net/HP_LaserJet_400_colorMFP_M475dw?ip=172.16.1.9 failed: Invalid argument

$ scanimage -d hpaio:/net/HP_LaserJet_400_colorMFP_M475dw?ip=172.16.1.9;
scanimage: open of device hpaio:/net/HP_LaserJet_400_colorMFP_M475dw?ip=172.16.1.9 failed: Invalid argument

I get the familliar message about scanext:

$ hp-scan -h
Traceback (most recent call last):
File "/usr/bin/hp-scan", line 40, in <module>
import scanext
ModuleNotFoundError: No module named 'scanext'

Looking at hp-check output:

The issue is not a personal configuration issue:

Current contents of '~/.hplip/hplip.conf' file:
warning: Could not access file: No such file or directory

Some python lib's seem to be missing, though I don't know if these
affect use of "sanext":

python3X Python 2.2 or greater - Python programming language REQUIRED 2.2 3.4.8 OK -
error: python3-notify2 Python libnotify - Python bindings for the libnotify Desktop notifications OPTIONAL - - MISSING 'python3-notify2 needs to be installed'
error: python3-pyqt4-dbus PyQt 4 DBus - DBus Support for PyQt4 OPTIONAL 4.0 - MISSING 'python3-pyqt4-dbus needs to be installed'
error: python3-pyqt4 PyQt 4- Qt interface for Python (for Qt version 4.x) REQUIRED 4.0 - MISSING 'python3-pyqt4 needs to be installed'

The system was converted to Qt5 a while back, so there should not be
any remaining Qt4 bindings; not sure if "notify2" is handled via:

* dev-python/inotifyx
Latest version available: 0.2.2
Latest version installed: 0.2.2

if it is then hp-check may have a bug, or is there something more that
provides the notify bindings?

I'm also not sure what provides:

python3-pil PIL - Python Imaging Library (required for commandline scanning with hp-scan) OPTIONAL - 1.1.7 OK -
error: python3-reportlab Reportlab - PDF library for Python OPTIONAL 2.0 - MISSING 'python3-reportlab needs to be installed'

and whether it would prevent finding the scanner (vs. blowing up when
using it).


Any further suggestions would be welcome.

Thank you
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ct85711
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Joined: 27 Sep 2005
Posts: 1725

PostPosted: Sat Sep 15, 2018 6:23 pm    Post subject: Reply with quote

well, for scanext, that is provided by the hplip package with the scanner USE flag.

https://forums.gentoo.org/viewtopic-p-8064472.html?sid=72f3beb589b436a52fc8b2caa2003692
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 44182
Location: 56N 3W

PostPosted: Sat Sep 15, 2018 8:22 pm    Post subject: Reply with quote

lembark,

Quote:
Q: What is "scanext"?
Q: What module provides it?
Q: What module provides pythons "reportlab"?
Q: What module provides "Python Imaging Library"?


Code:
$ eix reportlab
* dev-python/reportlab

$ eix pillow
* dev-python/pillow
     Available versions:  3.4.2-r1 4.3.0-r2 (~)4.3.0-r3 (~)5.2.0 {doc examples imagequant jpeg jpeg2k lcms qt5 test tiff tk truetype webp zlib PYTHON_TARGETS="pypy python2_7 python3_4 python3_5 python3_6 python3_7"}
     Homepage:            https://python-pillow.org/
     Description:         Python Imaging Library (fork)


You should not need to install either of those by hand. They should be dependencies if they are needed.

Looking in the hplip-3.18.6.ebuild
Code:
                scanner? (
                        >=dev-python/reportlab-3.2[${PYTHON_USEDEP}]
                        >=dev-python/pillow-3.1.1[${PYTHON_USEDEP}]


That suggests you have installed hplip without USE=scanner.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
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lembark
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Joined: 08 Aug 2014
Posts: 3
Location: St. Louis, MO, USA

PostPosted: Mon Sep 17, 2018 12:49 pm    Post subject: [solved] hplip fails with missing "scanext" Reply with quote

Found it: make.conf had "scanner,".

grep scanner returned a line, I missed the comma. Removing it, emerge --onshot hplip fixed it.

Thank you.

I'd never used "eix" before, thanks for that.
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