Your problem isn't anything to do with Ansible. It's a problem is an
interaction between how history is implemented and privilege escalation
via become.
To make your task work, you'll need to change your shell script like this:
- name: Get last yum update which includes "disablerepo"
shell: |
HISTFILE=/root/.bash_history
history -n
history | tac | grep -m 1 disablerepo
register: out
Normally, HISTFILE isn't set. The docs say it defaults to
"~/.bash_history", and it sort of does – for a broad enough definition
of who "~" references. Anyway, in my testing, it's necessary to
explicitly set it as shown above.
Simply pointing HISTFILE at the right file isn't enough. The shell
normally reads in the HISTFILE early on, but we're well past that by
line 2 of the shell script. The "history -n" command reads "/all history
lines not already read from the history file and append[s] them to the
history list/". The "history list" is not the same as the history file;
it's an in-memory construct that the shell manipulates until you close
the shell. It's then that the history list is written to the file. (Or
when you invoke "history -a" or "history -w".)
Now that you've got the history loaded, you can do your grep. The
failure that was being reported before was the result of trying to
construct the pipe between an uninitialized history list and your grep.
A bare history command at that spot just does nothing, but as part of a
pipeline it would fail.
However, you stated you want the last yum update which includes
"disablerepo". What you would have gotten - had it not been for the
failure to build a pipeline with an uninitialized history - was the
/first/ command in the history which included "disablerepo". Inserting
tac in the pipeline reverses the order so your grep will match on the
last occurrence.
Cheers,
--
Todd
On 3/21/24 10:00 AM, Dimitri Yioulos wrote:
Good day.
I want tp parse root's history to return the last occurrence of yum
update that includes the string "disablerepo". I would have thought
that this would work:
*---
- hosts: all
gather_facts: false
become: yes
tasks:
- name: Get last yum update which includes "disablerepo"
shell: 'history | grep -m 1 disablerepo'
register: out*
but, I get this error:
*fatal: [myhost1]: FAILED! => changed=true
ansible_facts:
discovered_interpreter_python: /usr/bin/python3
cmd: history | grep -m 1 disablerepo
delta: '0:00:00.013135'
end: '2024-03-21 09:54:12.391498'
msg: non-zero return code
rc: 1
start: '2024-03-21 09:54:12.378363'
stderr: ''
stderr_lines: <omitted>
stdout: ''
stdout_lines: <omitted>*
The command "history | grep -m 1 disablerepo" works fine at the
command line. I've tried every manner of escaping characters and
changing the command itself, but get errors regardless. How can I get
the desired results?
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Todd
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