Here's my workaround to wait until a command finishes and printing errors when the exit code is not 0:

let mut result = self
    .container
    .exec(ExecCommand::new(cmd))
    .await
    .expect("Failed to execute command in container");

let mut timeout = Duration::from_secs(5);
let mut exit_code = result.exit_code().await?;
loop {
    if exit_code.is_some() {
        break;
    }

    tokio::time::sleep(Duration::from_millis(100)).await;
    timeout -= Duration::from_millis(100);

    if timeout.as_millis() <= 0 {
        return Err("Timeout while waiting command to finish".into());
    }

    exit_code = result.exit_code().await?;
}

match exit_code {
    Some(0) => {}
    _ => {
        let code = result.exit_code().await?.unwrap_or(-1);
        let mut buffer = String::new();
        let mut stderr = result.stderr();
        stderr.read_to_string(&mut buffer).await?;
        buffer.split('\n').for_each(|line| {
            if !line.is_empty() {
                eprintln!("stderr: {}", line);
            }
        });
        return Err(format!("Failed to execute command (code = {})", code).into());
    }
};

Might be useful for you case as well.

WaitFor command exit with 0 #702

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