exec response returning with extra data

Scenario I’m trying to check if a specific files exists in my pod and assert it on my end using a direct string to string comparison.

Code Snippet

cmd = "[ -f /etc/hosts ] && echo 'True' || echo 'False'"
response = kubernetes_client.connect_post_namespaced_pod_exec(pod, kubernetes_namespace, stderr=True, stdin=True, stdout=True, command=cmd, tty=False)
is_file = response.strip()
print is_file
print [ord(c) for c in is_file]
print len(is_file)

Output

True
[1, 1, 84, 114, 117, 101]
6

Problem Before in kubernetes v1.0.0.b1, I did not have those extra characters in the beginning of my response but with the latest v1.0.0b3 I do. Anyone know why this is the case?

[mbohlool]

I remove my last two comments as they were confusing. I like @mrmcmuffinz suggestion and I will send a PR for that. Basically what you see was my failed attempt to provide enough information for the caller to distinguish between stderr and stdout. For that, you need to call the api in non-blocking mode (_preload_content=False).

[mrmcmuffinz]

Here is what I did to my local code to “resolve” it

    def update(self, timeout=0):
        """Update channel buffers with at most one complete frame of input."""
    
        if not self.is_open():
            return
        if not self.sock.connected:
            self._connected = False
            return
        r, _, _ = select.select(
            (self.sock.sock, ), (), (), timeout)
        if r:
            op_code, frame = self.sock.recv_data_frame(True)
            if op_code == ABNF.OPCODE_CLOSE:
                self._connected = False
                return
            elif op_code == ABNF.OPCODE_BINARY or op_code == ABNF.OPCODE_TEXT:
                data = frame.data
                if six.PY3:
                    data = data.decode("utf-8")
                if len(data) > 1:
                    channel = ord(data[0])
                    data = data[1:]
                    if data:
                        self._all += data
                        if channel not in self._channels:
                            self._channels[channel] = data
                        else:
                            self._channels[channel] += data

I just transposed self._all += data a few lines down to not include the channel data.