I have been trying to convert kubectl cp command to it's equivalent kubernetes python client program. I have following code for that:
from kubernetes import client, config
from kubernetes.stream import stream
import tarfile
from tempfile import TemporaryFile
# create an instance of the API class
config.load_kube_config()
api_instance = client.CoreV1Api()
exec_command = ['tar', 'xvf', '-', '-C', '/']
resp = stream(api_instance.connect_get_namespaced_pod_exec, "nginx-deployment-6bb6554bf-9sdtr", 'default',
command=exec_command,
stderr=True, stdin=True,
stdout=True, tty=False,
_preload_content=False)
source_file = '/tmp/abc.txt'
with TemporaryFile() as tar_buffer:
with tarfile.open(fileobj=tar_buffer, mode='w') as tar:
tar.add(source_file)
tar_buffer.seek(0)
commands = []
commands.append(tar_buffer.read())
while resp.is_open():
resp.update(timeout=1)
if resp.peek_stdout():
print("STDOUT: %s" % resp.read_stdout())
if resp.peek_stderr():
print("STDERR: %s" % resp.read_stderr())
if commands:
c = commands.pop(0)
# print("Running command... %s\n" % c)
resp.write_stdin(c)
else:
break
resp.close()The above code gives me following error:
/home/velotio/venv/bin/python /home/velotio/PycharmProjects/k8sClient/testing.py
Traceback (most recent call last):
File "/home/velotio/PycharmProjects/k8sClient/testing.py", line 38, in <module>
resp.write_stdin(c)
File "/usr/local/lib/python3.6/site-packages/kubernetes/stream/ws_client.py", line 160, in write_stdin
self.write_channel(STDIN_CHANNEL, data)
File "/usr/local/lib/python3.6/site-packages/kubernetes/stream/ws_client.py", line 114, in write_channel
self.sock.send(chr(channel) + data)
TypeError: must be str, not bytes
I am using Python 3.6.3 and on kubernetes 1.13 version.
You have to convert bytes back to string which is what write_stdin method is expecting to get.
for example:
resp.write_stdin(c.decode())Another example:
# Array with two byte objects
In [1]: a = [b'1234', b'3455']
# Pop one of them
In [2]: c = a.pop(0)
# it is of byte type
In [3]: c
Out[3]: b'1234'
# wrapping in str won't help if you don't provide decoding
In [4]: str(c)
Out[4]: "b'1234'"
# With decoding
In [5]: str(c, 'utf-8')
Out[5]: '1234'
# Or simply use the decode str method
In [6]: c.decode()
Out[6]: '1234'More on byte to string conversion here: Convert bytes to a string?