[SOLVED] -current hplip mixes Python 3 and 2 in a way that doesn't work

dugan · 11-27-2017, 06:15 PM

Am I the only one getting this?

Code:

dugan@slackbookpro ~> /usr/bin/hp-upgrade 
Traceback (most recent call last):
  File "/usr/bin/hp-upgrade", line 34, in <module>
    from base import utils, tui, module, os_utils, services, validation
  File "/usr/share/hplip/base/module.py", line 30, in <module>
    from . import tui, utils, device
  File "/usr/share/hplip/base/device.py", line 42, in <module>
    from . import status
  File "/usr/share/hplip/base/status.py", line 33, in <module>
    import cupsext
ImportError: No module named cupsext

It looks to me like -current's hplip package mixes Python 2 and 3 code in a way that doesn't work.

The entry point is a Python 2 file.

Code:

dugan@slackbookpro ~> ls -l /usr/bin/hp-upgrade 
lrwxrwxrwx 1 root root 25 Nov 27 15:44 /usr/bin/hp-upgrade -> ../share/hplip/upgrade.py*

Its shebang is:

Code:

#!/usr/bin/python

Which means it's executed with the Python 2 interpreter.

This series of imports eventually leads to the package's status.py being imported. This is a Python 3 file, and its shebang is:

Code:

#/usr/bin/python3

That file tries to import cupsext, which the hplip package only ships for Python 3:

Code:

dugan@slackbookpro ~> grep cupsext /var/log/packages/*
/var/log/packages/hplip-3.17.11-x86_64-1:usr/lib64/python3.6/site-packages/cupsext.la
/var/log/packages/hplip-3.17.11-x86_64-1:usr/lib64/python3.6/site-packages/cupsext.so

However, it can't find these files because it's running in the Python 2 interpreter, and crashes.

Is there something wrong with my installation, or is this a bug with either hplip or Slackware?

Ztcoracat · 11-27-2017, 09:41 PM

I'm not getting line 34 in module like you are:-

Code:

bash-4.3$ ls -l /usr/bin/hp-upgrade 
lrwxrwxrwx 1 root root 25 Jul  5  2016 /usr/bin/hp-upgrade -> ../share/hplip/upgrade.py

Python 2.7 here where you have 3.6--

Code:

bash-4.3$ grep cupsext /var/log/packages/*
/var/log/packages/hplip-3.16.5-x86_64-3:usr/lib64/python2.7/site-packages/cupsext.la
/var/log/packages/hplip-3.16.5-x86_64-3:usr/lib64/python2.7/site-packages/cupsext.so

Could be a bug in hplip. FWIW the only bug I've ever had with Slackware in 6 years was a xscreensaver bug.

https://answers.launchpad.net/hplip/+question/658190

This output is with stable 'not' current and I haven't upgraded phython:-

If you'd like I could run a handful of cmds to help you compare. Just let me know.

dugan · 11-27-2017, 10:15 PM

Quote:

This output is with stable 'not' current and I haven't upgraded python

Yeah I'm pretty sure this only affects current.

Just tried it on my other installation, which is also -current. Same "No module named cupsext" crash.

dugan · 11-27-2017, 10:43 PM

I'm now sure of the following:

a) it's an hplip bug, where the shebang-rewriting that's supposed to happen during "make install" isn't working properly for Python 3 builds

b) Pat can work around this by building hplip for Python 2 instead of Python 3.

Ztcoracat · 11-27-2017, 11:07 PM

Quote:

Originally Posted by dugan

I'm now sure of the following:

a) it's an hplip bug, where the shebang-rewriting that's supposed to happen during "make install" isn't working properly for Python 3 builds

b) Pat can work around this by building hplip for Python 2 instead of Python 3.

Shame it's a bug:- Failure during make install is a sure sign.

I'm sure Pat will work it out.

IS it possible dugan to to build hplip for Python 3? There are only subtle differences between Python 2 and Python 3, right?

I think you can chat with him on Twitter:-
https://twitter.com/volkerdi?lang=en