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I am trying to run a Perl script from within Python, but I get no output in stdout(), while my script perfectly works when I run it from a shell.

First, here is how I execute it from shell (assume I am on the right directory):

./vmlinkedclone.pl --server 192.168.20.2 --username root --password root --vmbase_id 2 --vm_destination_id 41 --vmname_destination "clone-41-snapname" --snapname Snapname #=> True, [] #=> or False, and a description of the error here #=> or an argument error

And here is how I try to call it from Python:

cmd = ['/home/user/workspace/vmlinkedclone.pl', '--server', '192.168.20.2', '--username', 'root', '--password', 'root' ,'--vmbase_id', '2', '--vm_destination_id', '41', '--vmname_destination', 'clone-41-snapname', '--snapname', 'Snapname'] pipe = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE) result = pipe.stdout.read() print "Result : ",result #=> Result :

Why do I get the desired output when I run my script from Shell, and get nothing from Python ?

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1 Answer 1

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9

Can you just try:

pipe = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)

Edit

I did find some issues related to the encoding sometime back and I resolved it in the following manner:

import subprocess cmd = ['/home/user/workspace/vmlinkedclone.pl', '--server', '192.168.20.2', '--username', 'root', '--password', 'root' ,'--vmbase_id', '2', '--vm_destination_id', '41', '--vmname_destination', 'clone-41-snapname', '--snapname', 'Snapname'] pipe = subprocess.Popen(cmd, shell = True, stdout=subprocess.PIPE, stderr=subprocess.PIPE) out, err = pipe.communicate() result = out.decode() print "Result : ",result
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4 Comments

I still have an empty output :/
I have just updated the answer. Can you just check that as well?
you might also try to print the error as well to see whether any error was encountered or not : print "Error",err
Oh it did help me a lot, by priting the stderr, now I know that the script cannot find one of my Perl module, which explains the problem. Thanks o/