Thanks a lot for the insights, Tod. Very appreciated...
And suggestions as well. I'll give them a try.
I'm still in an Ansible learning process and sometimes I also come upon
that curiosity of yours...
How come the notion of avoiding shell "at all cost" exists even for very
specific situations, like this one.
That's why I, based on the "no shell" assumption, tried to make my playbook
better.
Regards,
Alex
On Thu, Mar 7, 2024 at 9:54 AM Todd Lewis <uto...@gmail.com> wrote:
> I'm curious how these notions caught on that very clearly expressed shell
> expressions are inherently "bad", and that unfathomably complex jinja2
> expressions are inherently "better".
>
> I seriously doubt you're going to find a more maintainable, all-Ansible
> expression to accomplish what you're doing.
>
> However, I would suggest a couple alterations.
> (A) I'd make that "changed_when:" into a "failed_when:", and
> (B) I'd add "changed_when: false" (because it doesn't ever change
> anything).
> (C) I might also add a "vars:" to your set_fact task that maps
> "location[XYZ]" to your smtp.conf expressions:
>
> vars:
> locmap:
> locationX: snmpd.conf-X
> locationY: snmpd.conf-Y
> locationZ: snmpd.conf-Z
>
> Then your set_fact becomes "snmpd_conf: '{{
> locmap[grep_result.stdout_lines[0]] }}'
> That way you don't have to change "code" to update your location map data.
>
> On 3/7/24 11:02 AM, Alex Wanderley wrote:
>
> Hello,
>
> (And apologies if this is something too trivial...)
>
> I have a working playbook that searches and collects a string from a file
> and, based on that string, sets another variable.
> But I'm retrieving the string using grep/awk:
>
> - name: Collect server location
> ansible.builtin.shell: "/bin/grep {{ inventory_hostname }} {{
> server_list_file }} | /bin/awk '{print $3}'"
> register: grep_result
> changed_when: ( grep_result.rc != 0 )
>
> "{{ server_list_file }}" points to a file that looks like this:
> serverA flavor locationX owner
> serverB flavor locationY owner
> serverC flavor locationZ owner
>
> For completeness, this is how I'm using "grep_result":
> - name: Set snmpd config file
> ansible.builtin.set_fact:
> snmpd_conf: "{% if grep_result.stdout == 'locationX' %}snmpd.conf-X\
> {% elif grep_result.stdout == 'locationY' %}snmpd.conf-Y\
> {% else %}snmpd.conf-Z\
> {% endif %}"
>
> How could I, as simply as using the command/shell modules, accomplish the
> same results without resourcing to shell commands?
>
> Thanks a lot,
>
> Alex
>
> --
>
>
>
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>
> Alex Wanderley
>
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>
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[image: Edmonton_sig_RGB_S.jpg]
Alex Wanderley
Application and Infrastructure Analyst II
Server Solutions & Automation
Financial and Corporate Services | Open City and Technology
780-496-4156 Office
780-819-0273 Mobile
City of Edmonton
Century Place, 19th Floor
9803 102A Avenue NW
Edmonton AB, T5J 3A3
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