Problem with conditional

[Mikael Sandström]

Hi,

I've got a dictionary as below. I loop through that dictionary using a value and grep a file searching to see if the value already exists. If it doesnt I want to use that value in the next task (mytask) to do something. If the value exists should just skip that value and move on. 

The grep command can only be 0 or 1 and I can see in the debug that is: 

 "stdout": "0" #<-- value doesnt exists

or

 "stdout": "1" #<-- value exists

 

  dictname:                
        mykey1:                              
             myvalue: foo
        mykey2:                              
             myvalue: bar
        mykey3:                              
             myvalue: blerg
        ...
       
       
---
  - name: Check if line exists
    shell: grep {{ item.value.myvalue }} /some/file |wc -l
    with_dict: dictname
    register: check

  - debug: var=check.stdout
    with_items: check.results


  - name: Mytask
    template: src=asdad.j2 dest=/tmp/asdads .......
    with_dict: dictname
    when: check.stdout != "1"

I'm not sure how to reference the result from the check in the 'when' in mytask. If I try the above I get this:

error while evaluating conditional: check.stdout != "1"

Any ideas?

Thanks!

/Micke

[James Cammarata]

Hi Mikael, 

Using with_together as follows works for the example you've shown above:

- hosts: localhost

  gather_facts: no

  vars:

    dictname:

        mykey1:

             myvalue: foo 

        mykey2:

             myvalue: bar 

        mykey3:

             myvalue: blerg

  tasks:

  - name: Check if line exists

    shell: grep {{ item.value.myvalue }} /tmp/test_foo | wc -l

    with_dict: dictname

    register: check

  - name: Mytask

    shell: echo "the value for this is {{dictname[item.0].myvalue}}"

    when: item.1.stdout != "1"

    with_together:

    - dictname

    - check.results

The odd part is having to use the "item.0" as the key to the dictionary, which make sense when you consider that with_together iterates over the objects together, so for a dictionary the result of that iteration would be the keys rather than the values.

Setting up a test file with simply "blerg" in it, I get the following output when running the above playbook:

# echo blerg > /tmp/test_foo

# ansible-playbook -vv test_mikael_ml.yml 

PLAY [localhost] ************************************************************** 

TASK: [Check if line exists] ************************************************** 

<127.0.0.1> REMOTE_MODULE command grep blerg /tmp/test_foo | wc -l #USE_SHELL

changed: [127.0.0.1] => (item={'key': 'mykey3', 'value': {'myvalue': 'blerg'}}) => {"changed": true, "cmd": "grep blerg /tmp/test_foo | wc -l", "delta": "0:00:00.003378", "end": "2014-09-15 16:22:12.263595", "item": {"key": "mykey3", "value": {"myvalue": "blerg"}}, "rc": 0, "start": "2014-09-15 16:22:12.260217", "stderr": "", "stdout": "1", "warnings": []}

<127.0.0.1> REMOTE_MODULE command grep bar /tmp/test_foo | wc -l #USE_SHELL

changed: [127.0.0.1] => (item={'key': 'mykey2', 'value': {'myvalue': 'bar'}}) => {"changed": true, "cmd": "grep bar /tmp/test_foo | wc -l", "delta": "0:00:00.003305", "end": "2014-09-15 16:22:12.334522", "item": {"key": "mykey2", "value": {"myvalue": "bar"}}, "rc": 0, "start": "2014-09-15 16:22:12.331217", "stderr": "", "stdout": "0", "warnings": []}

<127.0.0.1> REMOTE_MODULE command grep foo /tmp/test_foo | wc -l #USE_SHELL

changed: [127.0.0.1] => (item={'key': 'mykey1', 'value': {'myvalue': 'foo'}}) => {"changed": true, "cmd": "grep foo /tmp/test_foo | wc -l", "delta": "0:00:00.003385", "end": "2014-09-15 16:22:12.406804", "item": {"key": "mykey1", "value": {"myvalue": "foo"}}, "rc": 0, "start": "2014-09-15 16:22:12.403419", "stderr": "", "stdout": "0", "warnings": []}

TASK: [Mytask] **************************************************************** 

skipping: [127.0.0.1] => (item=['mykey3', {u'cmd': u'grep blerg /tmp/test_foo | wc -l', u'end': u'2014-09-15 16:22:12.263595', u'stderr': u'', u'stdout': u'1', u'changed': True, u'rc': 0, 'item': {'value': {'myvalue': 'blerg'}, 'key': 'mykey3'}, u'warnings': [], u'delta': u'0:00:00.003378', 'invocation': {'module_name': u'shell', 'module_args': u'grep blerg /tmp/test_foo | wc -l'}, u'start': u'2014-09-15 16:22:12.260217'}])

<127.0.0.1> REMOTE_MODULE command echo "the value for this is bar" #USE_SHELL

<127.0.0.1> REMOTE_MODULE command echo "the value for this is foo" #USE_SHELL

PLAY RECAP ******************************************************************** 

127.0.0.1                  : ok=2    changed=2    unreachable=0    failed=0   

I truncated the output there at the end to save some space, the main point was to show it skipping the "blerg" item in that task.

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[Mikael Sandström]

Hi James,

Awesome! Worked like a charm.

Thank you!

/Micke