re_viewer 0.30.0-alpha.4

The Rerun viewer
Documentation 
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/// Detect if the application is running inside a Docker container.
///
/// Is memoized, so cheap to call each frame.
pub fn is_docker() -> bool {
    use std::sync::LazyLock;
    static IS_DOCKER: LazyLock<bool> = LazyLock::new(is_docker_impl);
    *IS_DOCKER
}

#[cfg(target_os = "linux")]
fn is_docker_impl() -> bool {
    /// Check for the presence of /.dockerenv file (most reliable method)
    fn is_dockerenv_present() -> bool {
        std::path::Path::new("/.dockerenv").exists()
    }

    /// Check if 'docker' appears in cgroup information
    fn is_docker_in_cgroup() -> bool {
        // Try multiple cgroup paths
        let cgroup_paths = ["/proc/1/cgroup", "/proc/self/cgroup"];

        for path in &cgroup_paths {
            if let Ok(contents) = std::fs::read_to_string(path)
                && contents.contains("docker")
            {
                return true;
            }
        }
        false
    }

    is_dockerenv_present() || is_docker_in_cgroup()
}

#[cfg(not(target_os = "linux"))]
fn is_docker_impl() -> bool {
    false
}