# 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)

from spack import *
import os


def check(condition, msg):
    """Raise an install error if condition is False."""
    if not condition:
        raise InstallError(msg)


class Cmake(Package):
    """A dumy package for the cmake build system."""
    homepage  = 'https://www.cmake.org'
    url       = 'https://cmake.org/files/v3.4/cmake-3.4.3.tar.gz'

    version('3.4.3',    '4cb3ff35b2472aae70f542116d616e63',
            url='https://cmake.org/files/v3.4/cmake-3.4.3.tar.gz')

    def setup_environment(self, spack_env, run_env):
        spack_cc    # Ensure spack module-scope variable is avaiable
        spack_env.set('for_install', 'for_install')

    def setup_dependent_environment(self, spack_env, run_env, dspec):
        spack_cc    # Ensure spack module-scope variable is avaiable
        spack_env.set('from_cmake', 'from_cmake')

    def setup_dependent_package(self, module, dspec):
        spack_cc    # Ensure spack module-scope variable is avaiable

        self.spec.from_cmake = "from_cmake"
        module.from_cmake = "from_cmake"

        self.spec.link_arg = "test link arg"

    def install(self, spec, prefix):
        mkdirp(prefix.bin)

        check(os.environ['for_install'] == 'for_install',
              "Couldn't read env var set in compile envieonmnt")

        cmake_exe = join_path(prefix.bin, 'cmake')
        touch(cmake_exe)
        set_executable(cmake_exe)
