CODEWITHSUNDEEP
pythonsubprocessstdinpopen
user1513388
user1513388

Reputation: 7451

Python subprocess piping to stdin

I'm trying to use python Popen to achieve what looks like this using the command line. 

 echo "hello" | docker exec -i $3 sh -c 'cat >/text.txt'

The goal is to pipe the "hello" text into the docker exec command and have it written to the docker container.

I've tried this but can't seem to get it to work.

import subprocess
from subprocess import Popen, PIPE, STDOUT

p = Popen(('docker', 'exec', '-i', 'nginx-ssl', 'sh', '-c', 'cat >/text.txt'), stdin=subprocess.PIPE)
p.stdin.write('Hello')
p.stdin.close()

Upvotes: 0

Views: 1786

Answers (1)

zondo
zondo

Reputation: 20356

You need to give stdin the new line also:

p.stdin.write('Hello\n')

That is the same thing even with sys.stdout. You don't need to give print a new line because it does that for you, but any writing to a file that you do manually, you need to include it. You should use p.communicate('Hello') instead, though. It's made for that.

Upvotes: 1

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