#!/usr/bin/env python
#
# Copyright 2013-2018 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)

from __future__ import print_function

import os
import sys

if sys.version_info[:2] < (2, 6):
    v_info = sys.version_info[:3]
    sys.exit("Spack requires Python 2.6 or higher."
             "This is Python %d.%d.%d." % v_info)

# Find spack's location and its prefix.
spack_file = os.path.realpath(os.path.expanduser(__file__))
spack_prefix = os.path.dirname(os.path.dirname(spack_file))

# Allow spack libs to be imported in our scripts
spack_lib_path = os.path.join(spack_prefix, "lib", "spack")
sys.path.insert(0, spack_lib_path)

# Add external libs
spack_external_libs = os.path.join(spack_lib_path, "external")

if sys.version_info[:2] == (2, 6):
    sys.path.insert(0, os.path.join(spack_external_libs, 'py26'))

sys.path.insert(0, spack_external_libs)

# Here we delete ruamel.yaml in case it has been already imported from site
# (see #9206 for a broader description of the issue).
#
# Briefly: ruamel.yaml produces a .pth file when installed with pip that
# makes the site installed package the preferred one, even tough sys.path
# is modified to point to another version of ruamel.yaml.
if 'ruamel.yaml' in sys.modules:
    del sys.modules['ruamel.yaml']

if 'ruamel' in sys.modules:
    del sys.modules['ruamel']

# Once we've set up the system path, run the spack main method
import spack.main  # noqa
sys.exit(spack.main.main())