[cctbxbb] Python3 / scons / non-conda builds

[Billy Poon]

Hi Graeme,

I recently checked in a change that should help. If the "scons" directory
does not exist and SCons is importable, the installed SCons will be used
instead. This is also helpful for conda builds since I want to move SCons
into the conda environment.

--
Billy K. Poon
Research Scientist, Molecular Biophysics and Integrated Bioimaging
Lawrence Berkeley National Laboratory
1 Cyclotron Road, M/S 33R0345
Berkeley, CA 94720
Tel: (510) 486-5709
Fax: (510) 486-5909
Web: https://phenix-online.org


On Wed, May 8, 2019 at 1:02 AM Graeme.Winter at Diamond.ac.uk <
Graeme.Winter at diamond.ac.uk> wrote:

> Dear All,
>
> Back in the mists of time, one could build cctbx modules without bootstrap
> or conda by having the right modules available yourself - a so-called
> baseless install which I think is still important in X-fel land?
>
> Anyhow, trying this with Python3 suggests that we have some special
> constraints which are perhaps too tight regarding module locations - for
> example scons -
>
> Grey-Area p3_compile :( $ pip3 install scons
> Collecting scons
>   Downloading
> https://files.pythonhosted.org/packages/65/41/ac58638421414acc64e26fc120c81c12bc2b1ebcea9e7e0939149878f0a3/scons-3.0.5-py2.py3-none-any.whl
> (831kB)
>     100% |████████████████████████████████| 839kB 14.3MB/s
> Installing collected packages: scons
> Successfully installed scons-3.0.5
> You are using pip version 19.0.1, however version 19.1.1 is available.
> You should consider upgrading via the 'pip install --upgrade pip' command.
> Grey-Area p3_compile :) $ make
> ./bin/libtbx.scons -j "`./bin/libtbx.show_number_of_processors`"
> ModuleNotFoundError: No module named 'SCons'
>
> During handling of the above exception, another exception occurred:
>
> Sorry: SCons is not available.
>   A possible solution is to unpack a SCons distribution in
>   one of these directories:
>     "/Users/graeme/svn/scr"
>     "/Users/graeme/svn/scr/cctbx_project"
>   SCons distributions are available at this location:
>     http://www.scons.org/
>   It may be necessary to rename the unpacked distribution, e.g.:
>     mv scons-0.96.1 scons
> make: *** [default] Error 1
> Grey-Area p3_compile :( $ which scons
> /Library/Frameworks/Python.framework/Versions/3.7/bin/scons
>
> Should we require that scons is installed as part of cctbx when it is
> already installed on the system?
>
> If we *do* have to have this constraint, maybe that should be checked at
> configure time (where it complains about six and future)
>
> Thoughts?
>
> In other news - the syntax changing branch referenced in
> https://github.com/cctbx/cctbx_project/pull/325 now compiles correctly on
> Python3 (note: not run, just compile but this means that it’s purpose is
> done) for the modules which it intends to touch and has no conflicts right
> now…
>
> Best wishes Graeme
>
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