Run a handler play and exit play if rc == 0 in ansible - ansible

Question

Hi is there a way I can run a handler play then exit the play if rc == 0. It can only do is exit the play using failed_when and proceed if rc != 0. I can't make notify: Service Guard execute. Been play with other approach like creating 2 play notify and exit no luck.
- name: Exit SG server from play
command: /usr/local/cmcluster/bin/cmversion
register: sg_check
notify: Service Guard
failed_when: sg_check.rc == 0
Here is new code I tried
- name: Check if Service Gurad then exit
command: /usr/local/cmcluster/bin/cmversion
register: sg_check
notify: Service Guard
changed_when: sg_check.rc == 0
ignore_errors: true
- meta: end_play
when: sg_check.rc == 0
but I get this:
ERROR! The conditional check 'sg_check.rc == 0' failed. The error was: error while evaluating conditional (sg_check.rc == 0): 'sg_check' is undefined
The error appears to have been in '/home/ansible/linuxpatchingv2/roles/applyPatch/tasks/main.yml': line 9, column 3, but may
be elsewhere in the file depending on the exact syntax problem.
The offending line appears to be:
ignore_errors: true
meta: end_play
^ here

Answer 1

Q: "Run a handler play then exit the play if rc == 0"
A: This is not possible to accomplish in one task because a task can't be both changed and failed at the same time. These two actions must be split. For example, in the playbook below the command will succeed, notify the handler, and end the play
shell> cat pb.yml
- hosts: localhost
gather_facts: false
tasks:
- command: "{{ cmd|default('/bin/true') }}"
register: sg_check
notify: Service Guard
changed_when: sg_check.rc == 0
ignore_errors: true
- meta: end_play
when: sg_check.rc == 0
- debug:
msg: Continue
handlers:
- name: Service Guard
debug:
msg: Service Guard notified
gives (abridged)
shell> ansible-playbook pb.yml
...
RUNNING HANDLER [Service Guard] ****
ok: [localhost] =>
msg: Service Guard notified
PLAY RECAP ****
localhost: ok=2 changed=1 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
The same playbook will continue if the command fails. For example
shell> ansible-playbook pb.yml -e "cmd=/bin/false"
PLAY [localhost] ****
TASK [command] ****
fatal: [localhost]: FAILED! => changed=false
cmd:
- /bin/false
delta: '0:00:00.003035'
end: '2020-08-24 09:33:22.039762'
msg: non-zero return code
rc: 1
start: '2020-08-24 09:33:22.036727'
stderr: ''
stderr_lines: <omitted>
stdout: ''
stdout_lines: <omitted>
...ignoring
TASK [debug] ****
ok: [localhost] =>
msg: Continue
PLAY RECAP ****
localhost: ok=2 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=1