Attaching stdin

[peter-facko]

Hello,

I am trying to attach stdin to a container.
I am using this code:

with PodmanClient(base_url="unix:///run/user/1000/podman/podman.sock") as client:
    container = client.containers.create(
        "",
        command=["bash", "-c", "cat - > /root/test"],
        stdin_open=True,
        rootfs="/tmp/root/",
    )

    container.start()

    container.client.post(
        f"/containers/{container.id}/attach",
        params={"stdin": "true", "stdout": "false", "stderr": "false"},
        data="test data",
        stream=True,
    )

    return_code = container.wait()
    container.remove()

This works well, but when I change data to an iterable or stdin, the resulting file contains these weird prefix and suffix lines:

  container.client.post(
      f"/containers/{container.id}/attach",
      params={"stdin": "true", "stdout": "false", "stderr": "false"},
      data=stdin,
      stream=True,
  )

Created with yes | head:

14
y
y
y
y
y
y
y
y
y
y

0

I understand that the first number is somehow connected to the input length and the number at the end seems to always be zero.

Does anyone have any solution to this?

[peter-facko]

Just after posting the question I randomly tried setting:

headers={"Content-Length": "0"}

and it seems to work.

I will keep the discussion open because I am not yet sure I got it right and maybe someone has something to add to this.