Conda, Conda-Forge, Python3 notes

Alex Reustle

The condaforge/linuxanvil docker container has the following limitations

1. No ssh. must use `repoman --remote-base http://github.com/fermi-lat` to perform checkouts
2. Python 3.6.4 is the default version
   1. Scons 2.3.0 is in conda default channel, but built against py27
   2. Scons 3.0.0 works, but runs on python 3 so our SConstruct and SConscript files don't parse correctly (we use print expressions, they expect print functions)
3. Use conda environments to build against 2.7 instead
   1. `conda create -n py2 python=2.7  git  && source activate py2`
   2. `pip install fermi-repoman`
   3. `repoman --remote-base http://github.com/fermi-lat checkout --force --develop ScienceTools master`
   4. `conda install -y scons=2.3.0`
   5. `scons --with-cxx=/opt/rh/devtoolset-2/root/usr/bin/gcc` 
   6. Must rewrite chunks of allExternals.scons to compensate for conda. Or possibly take the smart choice and add a function in SConstruct_common.scons to handle it there.
      
4.