Fabric log format to display date and time

Question

I have set Fabric up to log all SSH/Paramiko-related output with a level of INFO or higher using:

logging.basicConfig()
logging.getLogger('ssh.transport').setLevel(logging.INFO)

This results in a log looking like this:

[host1] Executing task 'task1'
[host1] Run: ls
...

Is it possible to change the formatter for the ssh.transport logger so that each line also has the date and time printed next to it?

Answer 1

As alecxe said, the format is hardcoded in Fabric 1.x (as of when I'm posting this, the only version available.) There was a rejected pull request that could have remedied this.

So instead we need a work around. This is a rather hacky solution that I wrote, but it relies on undocumented portions of Fabric, which means it may break in future versions.

from fabric.io import OutputLooper
from datetime  import datetime

def newFlush(self, text):
    stamp = datetime.now().strftime("%a %b %d %H:%M:%S - ")
    print(stamp + text)

OutputLooper._flush = newFlush

From this point forward, any output from your remote machine will have timestamps.

For example, without this code the output from sudo('echo "test"') would be:

[InteractSL-DT1.usma.ibm.com] sudo: echo "test"
[InteractSL-DT1.usma.ibm.com] out: test
[InteractSL-DT1.usma.ibm.com] out:

'test'

But after adding that, you'll now get this:

[InteractSL-DT1.usma.ibm.com] sudo: echo "test"
Fri Jan 02 12:54:49 - [InteractSL-DT1.usma.ibm.com] out:
Fri Jan 02 12:54:49 - test

Fri Jan 02 12:54:49 - [InteractSL-DT1.usma.ibm.com] out:
Fri Jan 02 12:54:49 -

'test'

You can play around with this basic idea to clean it up. The sudo line at the start of the output comes from fabric.operations._run_command, around line 900. I'm not sure of any simple way you could modify it.