Massimiliano Culpo 010f9451c9 bugfix: make _source_single_file work in venvs (#14569) ... Using `sys.executable` to run Python in a sub-shell doesn't always work in a virtual environment as the `sys.executable` Python is not necessarily compatible with any loaded spack/other virtual environment. - revert use of sys.executable to print out subshell environment (#14496) - try instead to use an available python, then if there *is not* one, use `sys.executable` - this addresses RHEL8 (where there is no `python` and `PYTHONHOME` issue in a simpler way		2020-02-07 16:36:23 -06:00
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spack	bugfix: make _source_single_file work in venvs (#14569)	2020-02-07 16:36:23 -06:00