Re: pip3-installing SCons on current Raspbian Stretch fails

Scons installs man pages into /usr/local as part of its setup.py

Seems like Raspbian doesn’t have the proper man page directories setup out
of the box. You should be able to fix this by running:

mkdir -p /usr/local/man/man1

Then re-running the pip3 install. I’m not really sure why the Python 2 one
worked.


On March 14, 2019 at 10:52:46 AM, Arndt Pauschardt ([email protected])
wrote:

Hi, *

a) I have a Raspberry 3 with the latest Raspbian Stretch release:
pi@raspi_rsdk1:~ $ uname -a
Linux raspi_rsdk1 4.14.79-v7+ #1159 SMP Sun Nov 4 17:50:20 GMT 2018 armv7l
GNU/Linux

b) the 'default' python is a Py2:
pi@raspi_rsdk1:~ $ python -V
Python 2.7.13

c) pip-installing Scons and running it works fine:
pi@raspi_rsdk2:~ $ which scons
/usr/local/bin/scons
pi@raspi_rsdk2:~ $ scons --version
SCons by Steven Knight et al.:
        script: v3.0.4.3a41ed6b288cee8d085373ad7fa02894e1903864, 2019-01-20
22:51:36, by bdeegan on kufra
        engine: v3.0.4.3a41ed6b288cee8d085373ad7fa02894e1903864, 2019-01-20
22:51:36, by bdeegan on kufra
        engine path: ['/usr/local/lib/python2.7/dist-packages/scons/SCons']
Copyright (c) 2001 - 2019 The SCons Foundation


Because the Raspberry is only one of multiple target platforms for us and
all other target platforms have been migrated to Py3, I wanted to do the
same for Raspian:
d) pip3-installing SCons fails:
pi@raspi_rsdk1:~ $ sudo pip3 install scons
Collecting scons
  Using cached https:/blabla/scons-3.0.4-py2.py3-none-any.whl
Installing collected packages: scons
Exception:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/pip/basecommand.py", line 215, in
main
    status = self.run(options, args)
  File "/usr/lib/python3/dist-packages/pip/commands/install.py", line 360,
in run
    prefix=options.prefix_path,
  File "/usr/lib/python3/dist-packages/pip/req/req_set.py", line 784, in
install
    **kwargs
  File "/usr/lib/python3/dist-packages/pip/req/req_install.py", line 851,
in install
    self.move_wheel_files(self.source_dir, root=root, prefix=prefix)
  File "/usr/lib/python3/dist-packages/pip/req/req_install.py", line 1064,
in move_wheel_files
    isolated=self.isolated,
  File "/usr/lib/python3/dist-packages/pip/wheel.py", line 377, in
move_wheel_files
    clobber(source, dest, False, fixer=fixer, filter=filter)
  File "/usr/lib/python3/dist-packages/pip/wheel.py", line 316, in clobber
    ensure_dir(destdir)
  File "/usr/lib/python3/dist-packages/pip/utils/__init__.py", line 83, in
ensure_dir
    os.makedirs(path)
  File "/usr/lib/python3.5/os.py", line 241, in makedirs
    mkdir(name, mode)
FileNotFoundError: [Errno 2] No such file or directory:
'/usr/local/man/man1'

e) the Py3 on Raspbian is
pi@raspi_rsdk1:~ $ python3 -V
Python 3.5.3


Now my question:
1. I guess I need to address the pip3 install problem from above to a
Raspbian mailing list, correct? It's pip3 which is causing the trouble,
right? Or is the offending path to /usr/local/man/man1 coming from SCons?
2. Is anyone here who is using sucessfully using SCons with Py3 on Raspbian?
2. looking into /usr/local/bin/scons, I found that scons is she-banged to
"python", so in case nothing in PATH is tweaked, scons will end up using
Py2 at least on Raspbian where both are available per default. The SCons
man says that Py3 is prefered, so the assumption behind this is that the
user is linking "python" to "python3" in order to use Py3 as engine under
the hood. Correct?

Thx for your time and help
Arndt






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