output of cc_ssh_authkey_fingerprints goes only to /dev/console

[Scott Moser]

I have an instance launched with cloud-config like:
  output: {all: '| tee -a /var/log/cloud-init-output.log'}

The output of ssh_authkey_fingerprints gets to the console twice.
This is because it calls:
    for line in lines:
        util.multi_log(text="%s%s\n" % (prefix, line))

The other occurance of a config module that writes to the console is
keys_to_console, which does:

        util.multi_log("%s\n" % (stdout.strip()),
                       stderr=False, console=True)

So, clearly a simple solution is just to turn 'stderr=False' (default for
multi_log is True). However, that means that if the user runs this module
like:
  cloud-init --force single -n ssh_authkey_fingerprints --frequency always

Then they'll get no output.

This just represents a more general problem, of how do we have
something explicitly write to the console, but not doubly write there.

[Scott Moser (smoser)]

I'm going to go ahead and commit the simple fix mentioned above, and then see if we can't fix this better later.

[James Falcon (falcojr)]

Tracked in Github Issues as https://github.com/canonical/cloud-init/issues/2284