def load(self, filename, create_if_missing=True):
        filename = Path(filename)
        if not filename.exists() and create_if_missing:
            self.load_pip_requirements()
            with filename.open("w") as f:
                f.write(yaml.dump(self.serialized, default_flow_style=False,
                                  encoding=None))
            self.filename = filename
            return self.save(filename)
        with filename.open() as f:
            for group, requirements in yaml.load(f.read()).items():
                for requirement in requirements:
                    self[group].add(Requirement.coerce(requirement))
        self.filename = filename
def install_links(self):
        """Add symlinks into bin/, lib/ (eg, for other applications)"""
        # Make build log visible - it contains OpenFOAM-specific information
        with working_dir(self.projectdir):
            os.symlink(
                join_path(os.path.relpath(self.install_log_path)),
                join_path('log.' + str(self.foam_arch)))

        if not self.config['link']:
            return

        # ln -s platforms/linux64GccXXX/lib lib
        with working_dir(self.projectdir):
            if os.path.isdir(self.archlib):
                os.symlink(self.archlib, 'lib')

        # (cd bin && ln -s ../platforms/linux64GccXXX/bin/* .)
        with working_dir(join_path(self.projectdir, 'bin')):
            for f in [
                f for f in glob.glob(join_path('..', self.archbin, "*"))
                if os.path.isfile(f)
            ]:
                os.symlink(f, os.path.basename(f))