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use std::fs;

fn has_docker_env_file() -> bool {
    fs::metadata("/.dockerenv").is_ok()
}

fn has_docker_in_cgroup() -> bool {
    match fs::read_to_string("/proc/self/cgroup") {
        Ok(file_contents) => file_contents.contains("docker"),
        Err(_error) => false,
    }
}

pub fn is_docker() -> bool {
    let is_docker = has_docker_env_file() || has_docker_in_cgroup();

    is_docker
}