Re: gpsd built, gps.py and ntpsec/ntploggps

[Michael Byczkowski]

Hi Gray!

> On 21. Feb 2021, at 21:02, Gary E. Miller <gem@rellim.com> wrote:
> 
> Yo Michael!
> 
> On Sun, 21 Feb 2021 15:57:25 +0100
> Michael Byczkowski <by@by-online.de> wrote:
> 
>> I’ve built gpsd from source on my Raspberry Pi’s Debian Buster,
>> everything went very smooth, I’m just stuck with the Python progs:
>> Finally, Ive figured out, how to make gps.py accessible for all user
>> by creating a file /usr/lib/python3/dist-packages/gps.pth with the
>> contents '/usr/local/lib/python3/dist-packages’, so far so good. Now
>> ntpsec’s ntploggps still breaks with 'can't find Python GPSD
>> library’; any ideas?
> 
> Per the FHS, user built programs should not install in /usr/lib to avoid
> conflicts with system/packager installed programs.  Conflicts between
> user built, and system installed programs are very commer, so I beleive
> the FHS is correct.
> 
> When you built gpsd, it said something like this:
> 
>    "Ensure your PYTHONPATH includes /usr/local/lib/pythonXXXX"
> 
> Did you follow that instruction?

Yes, i did

> 
> Easy to see, just run this:
> 
>    $ echo $PYTHONPATH
>    /usr/local/lib/pythonXXXX

I did exactly that and it helps with my shell, but when /usr/sbin/ntploggps is 
run by cron or alike, it still breaks with 'can't find Python GPSD
library’ as before…

> 
>> P.S.: It would be great to include the topic of setting PYTHONPATH in
>> greater length in the build/install doc, to avoid issues like
>> 'ubxtool: failed to import gps, check PYTHONPATH’, and help me making
>> PYTHONPATH persistent across sessions and users, thank you!
> 
> Sadly this is very distro dependent, and mutates frquently.  If you figure
> out how to do so for your (unspecified) distro, then I will add it to
> the doc.
> 
> For those that use bash, just put this in your ~/.bashrc:
> 
>        export PYTHONPATH=/usr/local/lib/pythonXXXX
> 
> I often keep 6, or more, python verions installed at any one time, so
> juggling that requires constant attention.  Changing PYTHONPATH becomes
> second nature.
> 
> RGDS
> GARY
> ---------------------------------------------------------------------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
>       gem@rellim.com  Tel:+1 541 382 8588
> 
>           Veritas liberabit vos. -- Quid est veritas?
>    "If you can't measure it, you can't improve it." - Lord Kelvin