Hi,
I am hoping that someone can explain a difference in behaviour when using
the API, where success is achieved when using Python 2 (2.7 tested) and a
failure occurs when using Python 3 (3.6 and 3.8 tested).
The outcome of running the same code with the 2 versions of Python are as
follows (ansible == latest, but occurs on 2.9, 2.10 etc):
*Python 2.7*
./py2/bin/python test.py; echo $? --> 0
# extract of full output
controller1 | SUCCESS => {
"msg": "a0492524b4da454d992d9987481cacf2"
}
node1 | SUCCESS => {
"msg": "a0492524b4da454d992d9987481cacf2"
}
Ignore the fact that the machine ID is identical, as that is purely due to
instances running from the same base image.
*Python 3.6*
./py3/bin/python test.py; echo $? --> 2
# extract of full output
[WARNING]: Unhandled error in Python interpreter discovery for host node1:
'>' not supported between instances of 'NoneType' and 'int'
An exception occurred during task execution. To see the full traceback, use
-vvv. The error was: TypeError: '>' not supported between instances of
'NoneType' and 'int'
node1 | FAILED! => {
"msg": "Unexpected failure during module execution.",
"stdout": ""
}
controller1 | SUCCESS => {
"msg": "a0492524b4da454d992d9987481cacf2"
}
I have attached the steps to reproduce the issue.
It seems to relate to the connection plugin, whereby unless a local
connection is used then running with Python 3 will error, whereas Python 2
will not.
Cheers,
Ceri
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# Pre-requisites
- python3.6
- virtualenv module for python3.6
- python2.7
# Prep
cd $(mktemp -d)
export CONTROLLER_IP=x.x.x.x NODE_IP=x.x.x.x
cat <<EOS > ./inventory.yaml
---
all:
hosts:
controller1:
ansible_connection: local
ansible_host: '{{ lookup("env", "CONTROLLER_IP") }}'
node1:
ansible_host: '{{ lookup("env", "NODE_IP") }}'
children:
controllers:
hosts:
controller1:
nodes:
hosts:
node1:
cluster:
children:
controllers:
nodes:
...
EOS
cat <<EOS > ./.vault-pass
secret
EOS
cat <<EOS > test.py
import sys
from ansible.executor.task_queue_manager import TaskQueueManager
from ansible.inventory.manager import InventoryManager
from ansible.module_utils.common.collections import ImmutableDict
from ansible.module_utils._text import to_bytes
from ansible.parsing.dataloader import DataLoader
from ansible.parsing.vault import VaultSecret
from ansible.playbook.play import Play
from ansible.plugins.callback.minimal import CallbackModule
from ansible.vars.manager import VariableManager
from ansible import context
context.CLIARGS = ImmutableDict(connection='ssh', forks=10, become=None,
become_method=None, become_user=None,
check=False, diff=False,
inventory=['./inventory.yaml'])
loader = DataLoader()
loader.set_vault_secrets([('default',
VaultSecret(_bytes=to_bytes(open('./.vault-pass',
'rb').readlines().pop().rstrip()))),])
inventory = InventoryManager(loader=loader, sources=['./inventory.yaml'])
variable_manager = VariableManager(loader=loader, inventory=inventory)
passwords=dict()
results_callback = CallbackModule()
tqm = TaskQueueManager(inventory=inventory, variable_manager=variable_manager,
loader=loader, passwords=passwords, stdout_callback=results_callback)
play_source = dict(name="Ansible Play", hosts='cluster', gather_facts='no',
tasks=[
dict(action=dict(module='setup',
args=dict(gather_subset='min'))),
dict(action=dict(module='debug', args=dict(msg='{{
ansible_machine_id }}'))),])
play = Play().load(play_source, variable_manager=variable_manager,
loader=loader)
result = tqm.run(play)
sys.exit(result)
EOS
python3 -m virtualenv -p python2.7 py2
./py2/bin/pip install ansible
python3 -m virtualenv -p python3.6 py3
./py3/bin/pip install ansible
./py3/bin/ansible-vault encrypt --encrypt-vault-id default
--vault-password-file ./.vault-pass inventory.yaml
# Tests
./py2/bin/python test.py; echo $?
./py3/bin/python test.py; echo $?
