Register variable, get specific strings and use strings in subsequent task

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1

Hello guys,
I am not quite sure how to describe this.
I have a simple task, which executes a shell command and register a variable.

- name: execute ovs-vsctl show command
shell: ovs-vsctl show
register: output

This will give me stdout with different ports like this:
Port “7da0c92dc […]”
Port “[479401901[…]”
[…]

But some Ports will have an error:
“could not open network device 5b574[…]”

Now I need to get all the Ports with an error (with a loop i guess (?)). Then execute a command to delete this faulty ports in subsuquent task :

- name: delete faulty ports
shell: ovs-vsctl del-port 5b574[…]

I was thinking about something like this:

- shell: ’ ovs-vsctl del-port “{{item}}” ’

with_items:
- 5b574 […]

- xxxx […]

Or what is the best way to realize this? (Probably by using a python/shell script, but it should be done with Ansible)

I have a hard time to realize this.

How can I filter for all those specific strings with faulty ports?
I probably need to save those strings in a list or something, by using a loop, right?

I would be grateful for any help / some ideas regarding the best way to proceed with this.

2

I don't know ovs-vsctl, but
http://www.openvswitch.org/support/dist-docs/ovs-vsctl.8.txt mentions
the option of generating output as JSON for that command.
This will probably simplify your problem.
Can you show some output with that option enabled?

3

Thank you for your reply.
I can’t rly get a JSON response from the command ovs-vsctl show, since it is only possible for find/list operations.

I tried to get a JSON output using a list operation, but it looks kinda strange to me… (it shows only a small part, since the output is really long)

{
“data”: [
[
[
“uuid”,
“270cedb4-f43c-4ee1-86f6-d3ac89b449fc”],
[
“set”,
],
[
“map”,
],
[
“map”,
],
[
“set”,
],
[
“set”,
],
[
“set”,
],
[
“set”,
],
[
“set”,
],
[
“set”,
],
[
“set”,
],
[
“set”,
],
“could not open network device veth1pl4194 (No such device)”,
[
“map”,
…