2 Implementation

gistfile1.txt

def run_bash_show_output(command: str):
    process = sub.Popen(
        command.strip(),
        stdout=sub.PIPE,
        stderr=sub.STDOUT,
        shell=True,
        encoding='utf-8',
        errors='replace'
    )

    while True:
        realtime_output = process.stdout.readline()  # type: ignore

        if realtime_output == '' and process.poll() is not None:
            break

        if realtime_output:
            print(realtime_output.strip(), flush=True)

    return process


------------------------------------------------------------------------------


bash_nerdctl_build = com.run_bash_show_output(
            f'''
            nerdctl build -f Dockerfile --address=/run/k3s/containerd/containerd.sock --namespace k8s.io -t "nexus.seicdevops.com/docker-dev-share/noms/{self.service_name}:{self.build_tag}" .
            '''
        )

        if bash_nerdctl_build.returncode:
            print("build error, stderr output:")
            print(f"{bash_nerdctl_build.stderr}")
            sys.exit(0)

I'm not sure what specific case you have here, but if you just want to trigger the build to run and present the output to the user, then you could do it with sub.run() and not capture the output. It would allow the build output to flow naturally in the terminal.