lib/ramble/ramble/config.py [777:817]:
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            if scope_name in current_overrides:
                num_overrides += 1
            else:
                break

        overrides = InternalConfigScope(scope_name)
        config.push_scope(overrides)
        config.set(path_or_scope, value, scope=scope_name)

    try:
        yield config
    finally:
        scope = config.remove_scope(overrides.name)
        assert scope is overrides


#: configuration scopes added on the command line
#: set by ``ramble.main.main()``.
command_line_scopes = []


def _add_platform_scope(cfg, scope_type, name, path):
    """Add a platform-specific subdirectory for the current platform."""
    platform = spack.platforms.host().name
    plat_name = os.path.join(name, platform)
    plat_path = os.path.join(path, platform)
    cfg.push_scope(scope_type(plat_name, plat_path))


def _add_command_line_scopes(cfg, command_line_scopes):
    """Add additional scopes from the --config-scope argument.

    Command line scopes are named after their position in the arg list.
    """
    for i, path in enumerate(command_line_scopes):
        # We ensure that these scopes exist and are readable, as they are
        # provided on the command line by the user.
        if not os.path.isdir(path):
            raise ConfigError("config scope is not a directory: '%s'" % path)
        elif not os.access(path, os.R_OK):
            raise ConfigError("config scope is not readable: '%s'" % path)
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lib/ramble/spack/config.py [733:773]:
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            if scope_name in current_overrides:
                num_overrides += 1
            else:
                break

        overrides = InternalConfigScope(scope_name)
        config.push_scope(overrides)
        config.set(path_or_scope, value, scope=scope_name)

    try:
        yield config
    finally:
        scope = config.remove_scope(overrides.name)
        assert scope is overrides


#: configuration scopes added on the command line
#: set by ``spack.main.main()``.
command_line_scopes = []  # type: List[str]


def _add_platform_scope(cfg, scope_type, name, path):
    """Add a platform-specific subdirectory for the current platform."""
    platform = spack.platforms.host().name
    plat_name = os.path.join(name, platform)
    plat_path = os.path.join(path, platform)
    cfg.push_scope(scope_type(plat_name, plat_path))


def _add_command_line_scopes(cfg, command_line_scopes):
    """Add additional scopes from the --config-scope argument.

    Command line scopes are named after their position in the arg list.
    """
    for i, path in enumerate(command_line_scopes):
        # We ensure that these scopes exist and are readable, as they are
        # provided on the command line by the user.
        if not os.path.isdir(path):
            raise ConfigError("config scope is not a directory: '%s'" % path)
        elif not os.access(path, os.R_OK):
            raise ConfigError("config scope is not readable: '%s'" % path)
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