Find line in file

[Neil Young]

One of the most recommended things is to use "lineinfiles" with some special attributes for just finding a line in a file.

I have a weird issue with this. If I just lookup one line, like so:

 - name: TEST - Check /tmp/out.log

      lineinfile:

        path: /tmp/out.log

        regexp: "^bla"

        state: absent

      check_mode: yes

      changed_when: false

      register: checklog

      failed_when: not checklog.found

This sequence fails (as expected), because the "bla" line is not in the file. If I enter a string, which is in the file, it doesn't fail. So far so good.

Now I wanted to examine several lines, but this never fails. "line1" to "line4" are in, "bla" not.

But the result is OK...

  - name: TEST - Check /tmp/out.log

      lineinfile:

        path: /tmp/out.log

        regexp: "{{ item }}"

        state: absent

      check_mode: yes

      changed_when: false

      register: checklog

      with_items:

        - {item: "^line1"}

        - {item: "^line2"}

        - {item: "^line3"}

        - {item: "^line4"}

        - {item: "^bla"}

      failed_when: not checklog.found

Does that make sense at all?

[Neil Young]

Oops. Disregard please:

regexp: "{{ item.item }}"

[Jorge Rúa]

If it never fails is just because you are iterating over items and registering the result of each iteration. So the condition is only evaluated only on the last iteration. 

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[Neil Young]

No, the reason was the wrong "{{ item.item }}" reference.

Real world example:

    - name: TEST - Check /tmp/out.log for some lines expected to be there

      tags: test

      lineinfile:

        path: /tmp/out.log

        regexp: "{{ item.item }}"

        state: absent

      check_mode: yes

      changed_when: false

      register: checklog

      with_items:

        - { item: "^v=1"}

        - { item: "^s=Kurento Media Server" }

        - { item: "^IceCandidateFound" }

        - { item: "^IceGatheringDone" }

      failed_when: not checklog.found

    

The failing line is "v=1", because it is "v=0". The rest of the lines except the last is there. Result:

TASK [TEST - Check /tmp/out.log for some lines expected to be there] ******************************************************************************************************************************************************************

failed: [ubuntuVM] (item={'item': '^v=1'}) => {"ansible_loop_var": "item", "backup": "", "changed": false, "failed_when_result": true, "found": 0, "item": {"item": "^v=1"}, "msg": ""}

ok: [ubuntuVM] => (item={'item': '^s=Kurento Media Server'}) => {"ansible_loop_var": "item", "backup": "", "changed": false, "failed_when_result": false, "found": 1, "item": {"item": "^s=Kurento Media Server"}, "msg": "1 line(s) removed"}

ok: [ubuntuVM] => (item={'item': '^IceCandidateFound'}) => {"ansible_loop_var": "item", "backup": "", "changed": false, "failed_when_result": false, "found": 12, "item": {"item": "^IceCandidateFound"}, "msg": "12 line(s) removed"}

failed: [ubuntuVM] (item={'item': '^IceGatheringDone'}) => {"ansible_loop_var": "item", "backup": "", "changed": false, "failed_when_result": true, "found": 0, "item": {"item": "^IceGatheringDone"}, "msg": ""}

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

ubuntuVM                   : ok=1    changed=0    unreachable=0    failed=1    skipped=0    rescued=0    ignored=0   

So it works as expected

Solved.