failed_when do not work with telnet output - ansible

Question

I will try to set a telnet task to failed if "instance" is in the output message, but it didn't work.
here is the log:
TASK [ISAM Log to log1 and log2] **************************************************************************************************************************************
task path: /Users/sascha.mueller/Downloads/isam_log.yml:9
changed: [1.2.3.4] => {
"changed": true,
"failed_when_result": false,
"output": [
"configure system syslog no route dslamlog msg-type all\r\n\r\nError : instance does not exist\r\n\r\nISAM-ISAM_7363_Labor_Zw>#",
"configure system syslog no destination dslamlog\r\n\r\nError : instance does not exist\r\n\r\nISAM-ISAM_7363_Labor_Zw>#"
]
}
TASK [fail the play if the previous command did not succeed] **********************************************************************************************************
task path: /Users/sascha.mueller/Downloads/isam_log.yml:27
skipping: [1.2.3.4] => {
"changed": false,
"skip_reason": "Conditional result was False"
}
I also tried command_output.stderr e.g. but all these values doesn't exist
---
-
hosts: all
connection: local
become: no
tasks:
- name: ISAM Log to log1 and log2
ignore_unreachable: yes
telnet:
user: bla
password: blubb
login_prompt: "login: "
password_prompt: "password: "
timeout: 5
prompts:
- "[#|$]"
command:
- configure system syslog no route dslamlog msg-type all
- configure system syslog no destination dslamlog
register: command_output
failed_when: "'instance' in command_output.output"
- name: fail the play if the previous command did not succeed
fail:
msg: "the command failed"
when: "'instance' in command_output.output"
Is it possible to check this with an telnet command or to direct check it with variable.output or only with variable.stderr?

Answer 1

You can see in your example that output is a list:
"output": [
"configure system syslog no route dslamlog msg-type all\r\n\r\nError : instance does not exist\r\n\r\nISAM-ISAM_7363_Labor_Zw>#",
"configure system syslog no destination dslamlog\r\n\r\nError : instance does not exist\r\n\r\nISAM-ISAM_7363_Labor_Zw>#"
]
When you ask if "'instance' in command_output.output", you are asking if there is an item in outout that is the string instance. That is, your expression would evaluate to true if output looked like this:
"output": [
"this item does not match",
"instance"
]
What you really want to ask is "does any item in output contain the string instance?". The simplest way to do that is probably by concatenating all the lines into a single string:
"'instance' in ''.join(command_output.output)"
You should be able to use this in either you failed_when condition:
- name: ISAM Log to log1 and log2
ignore_unreachable: yes
telnet:
user: bla
password: blubb
login_prompt: "login: "
password_prompt: "password: "
timeout: 5
prompts:
- "[#|$]"
command:
- configure system syslog no route dslamlog msg-type all
- configure system syslog no destination dslamlog
register: command_output
failed_when: "'instance' in ''.join(command_output.output)"
Or in the when statement on your fail task:
- name: fail the play if the previous command did not succeed
fail:
msg: "the command failed"
when: "'instance' in ''.join(command_output.output)"