problem with shebang of Python scripts being too long

[karenyyng]

Some Python packages install python scripts to be executed via bash.
If we use the Python installed with spack, the path of the python is something like:
#!/<SOME_DIR>/spack_git_repo/opt/spack/chaos_5_x86_64_ib/gcc-4.4.7/python-2.7.10- yqkr6m74axh3nafjscgtjb3zj3htx3fe/bin/python

Somehow the bash interpreter will cut it off when the shebang is longer than a certain number of characters as documented here

For me it cut off so the she-bang looked like:
``#!/<SOME_DIR>/spack_git_repo/opt/spack/chaos_5_x86_64_ib/gcc-4.4.7/python-2.7.10- yqkr6m74axh3nafjscgtjb3zj3htx3fe/bin/p`

A simple fix is to change the line of shebang to:
#!/bin/env python

Is there a better solution than manually changing all the shebangs for the python scripts?
In any case, I thought it may be nice to document this behavior somewhere in the spack documentation for Python use.
Thanks.

[mathstuf]

Yes, there is a character limit, defined here. It also only supports one argument (see this LWN article).

As for a solution, it might be best if the scripts just used the environment to get the right Python from spack (requiring that spack be loaded to run the script).

[tgamblin]

Duplicates #54