[Fab-user] combine_stderr = False has no effect

[Lee Hughes]

Hi I'm new to Fabric and am having trouble separating stderr from stdout.

from fabric.api import *
env.host_string = 'localhost'
env.port = 22
env.username = 'myusername'
env.password = 'mypassword'
env.warn_only = True
result = run('somebadcommand')

[localhost] run: somebadcommand
[localhost] out: /bin/bash: somebadcommand: command not found
[localhost] out:

Warning: run() received nonzero return code 127 while executing
'somebadcommand'!

result.stdout

'/bin/bash: somebadcommand: command not found'

result.stderr

''

result = run('somebadcommand',combine_stderr=False)

[localhost] run: somebadcommand
[localhost] out: /bin/bash: somebadcommand: command not found
[localhost] out:

Warning: run() received nonzero return code 127 while executing
'somebadcommand'!

result.stdout

'/bin/bash: somebadcommand: command not found'

result.stderr

''

​I expected the second attempt to return stderr to result.stderr instead of
result.stdout​

Any help would be greatly appreciated.
Thanks-
Lee

[Jeff Forcier]

You probably also need to explicitly say 'pty=False' - see
http://docs.fabfile.org/en/1.10/usage/interactivity.html#combining-the-two

Post by Lee Hughes
Hi I'm new to Fabric and am having trouble separating stderr from stdout.

from fabric.api import *
env.host_string = 'localhost'
env.port = 22
env.username = 'myusername'
env.password = 'mypassword'
env.warn_only = True
result = run('somebadcommand')

[localhost] run: somebadcommand
[localhost] out: /bin/bash: somebadcommand: command not found
Warning: run() received nonzero return code 127 while executing
'somebadcommand'!

result.stdout

'/bin/bash: somebadcommand: command not found'

result.stderr

''

result = run('somebadcommand',combine_stderr=False)

[localhost] run: somebadcommand
[localhost] out: /bin/bash: somebadcommand: command not found
Warning: run() received nonzero return code 127 while executing
'somebadcommand'!

result.stdout

'/bin/bash: somebadcommand: command not found'

result.stderr

''
I expected the second attempt to return stderr to result.stderr instead of
result.stdout
Any help would be greatly appreciated.
Thanks-
Lee
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[Lee Hughes]

Adding pty=False to the run() arguments did the trick. Thanks much Jeff!

*Lee*