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# Copyright 2013-2019 Lawrence Livermore National Security, LLC and other
# Spack Project Developers. See the top-level COPYRIGHT file for details.
#
# SPDX-License-Identifier: (Apache-2.0 OR MIT)
import os
from spack.operating_systems.linux_distro import LinuxDistro
from spack.util.module_cmd import get_module_cmd
class CrayFrontend(LinuxDistro):
"""Represents OS that runs on login and service nodes of the Cray platform.
It acts as a regular Linux without Cray-specific modules and compiler
wrappers."""
def find_compilers(self, *paths):
"""Calls the overridden method but prevents it from detecting Cray
compiler wrappers to avoid possible false detections. The detected
compilers come into play only if a user decides to work with the Cray's
frontend OS as if it was a regular Linux environment."""
env_bu = None
# We rely on the fact that the PrgEnv-* modules set the PE_ENV
# environment variable.
if 'PE_ENV' in os.environ:
# Copy environment variables to restore them after the compiler
# detection. We expect that the only thing PrgEnv-* modules do is
# the environment variables modifications.
env_bu = os.environ.copy()
# Get the name of the module from the environment variable.
prg_env = 'PrgEnv-' + os.environ['PE_ENV'].lower()
# Unload the PrgEnv-* module. By doing this we intentionally
# provoke errors when the Cray's compiler wrappers are executed
# (Error: A PrgEnv-* modulefile must be loaded.) so they will not
# be detected as valid compilers by the overridden method. We also
# expect that the modules that add the actual compilers' binaries
# into the PATH environment variable (i.e. the following modules:
# 'intel', 'cce', 'gcc', etc.) will also be unloaded since they are
# specified as prerequisites in the PrgEnv-* modulefiles.
modulecmd = get_module_cmd()
exec(compile(
modulecmd('unload', prg_env, output=str, error=os.devnull),
'<string>', 'exec'))
# Call the overridden method.
clist = super(CrayFrontend, self).find_compilers(*paths)
# Restore the environment.
if env_bu is not None:
os.environ.clear()
os.environ.update(env_bu)
return clist
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