Question

For some reason Popen is failing to exit after a Powershell script is called and the output of the command is not dynamic.

Am I missing something in the code:

sCmd = "powershell -file somefile.ps1"
process = subprocess.Popen(sCmd.strip(), shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)

while True:
    p = process.communicate()
    sys.stdout.write(p[0])
    sys.stderr.write(p[1])

    sys.stdout.flush()
    if(len(p[0]) == 0 and isinstance(process.poll(), int)):
        break

if(process.wait() != 0):
    os._exit(1)

Answer 1

Verify that your powershell command is actually exiting correctly. A hung powershell process can easily be the cause of this.

Also you should not have the shell=True. It is a huge security risk. It could also be playing into why the process is hanging. If your powershell script won’t run unless shell=True then fixing that would be a good place to focus.