function _pure_is_inside_container \
    --argument-names cgroup_namespace
    set --query cgroup_namespace[1]; or set cgroup_namespace /proc/1/cgroup

    set --local failure 1
    if set --query pure_enable_container_detection; and test "$pure_enable_container_detection" = true
        set --local success 0
        if test -n "$container"
            return $success
        end

        set --local os_name (uname -s)
        # echo $os_name
        if test "$os_name" = Linux
            if _pure_detect_container_by_cgroup_method $cgroup_namespace
                return $success
            end

            if _pure_detect_container_by_pid_method
                return $success
            end
        end
    end
    return $failure
end