access particular values gathered with stat

Archives Ansible Project
1

I want to check for existence of a folder and also the right owner, group and mode.
When any of the conditions (exists, owner=postgres, group=postgres, mode=0755) does not meet requirements I want to stop and be notified of the reason.

I think I need stat for that (exists, isdir, gr_name, pw_name, mode)

As a first step I try to get the value of pg_name with debug, but can not figure out how to adress that value

  • name: Get stats of a file
    ansible.builtin.stat:
    path: “{{ item }}”
    register: postgres
    loop:

  • /opt/db/data

  • name: return ownership is right
    ansible.builtin.debug:
    msg: “owned by postgres”
    when: postgres.stat.pw_name == ‘postgres’

output

TASK [show content of ‘postgres’] ************************************************************************************************************************************************
fatal: [dvzsn-rd5400.ref.eakte.rz-dvz.cn-mv.de]: FAILED! => {“msg”: “The conditional check ‘postgres.stat.pw_name == ‘postgres’’ failed. The error was: error while evaluating conditional (postgres.stat.pw_name == ‘postgres’): ‘dict object’ has no attribute ‘stat’. ‘dict object’ has no attribute ‘stat’\n\nThe error appears to be in ‘/home/gwagner/repos/automation_postgres/playbooks/check_postgres_dir.yml’: line 16, column 7, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n - name: show content of ‘postgres’\n ^ here\n”}

what I am doing wrong?

2

You are using “loop”. This places the results in a list called “results” (ie postgres.results). Use the literal path in stat and you will get the reference you seek in the debug task.

  • name: Get stats of a file
    ansible.builtin.stat:
    path: /opt/db/data

register: postgres

  • name: return ownership is right
    ansible.builtin.debug:
    msg: “owned by postgres”
    when: postgres.stat.pw_name == ‘postgres’

OR

  • name: Get stats of a file
    ansible.builtin.stat:
    path: “{{ item }}”
    register: postgres
    loop:

  • /opt/db/data

  • name: return ownership is right
    ansible.builtin.debug:
    msg: “{{ item.item }} owned by postgres”
    loop: “{{ postgres.results }}”
    when:

  • item.stat.exists == true

  • item.stat.pw_name is defined

  • item.stat.pw_name == ‘postgres’

  • name: return ownership is not right
    ansible.builtin.debug:
    msg: “{{ item.item }} owned not by postgres”
    loop: “{{ postgres.results }}”
    when:

  • item.stat.exists == true

  • item.stat.pw_name is defined

  • item.stat.pw_name != ‘postgres’

  • name: return does not exist
    ansible.builtin.debug:
    msg: “{{ item.item }} does not exist”
    loop: “{{ postgres.results }}”
    when:

  • item.stat.exists == false

Walter

3

TASK [what is postgres] ************************************************************************************************

ok: [localhost] => {

“postgres”: {

“changed”: false,

“msg”: “All items completed”,

“results”: [

{

“ansible_loop_var”: “item”,

“changed”: false,

“failed”: false,

“invocation”: {

“module_args”: {

“checksum_algorithm”: “sha1”,

“follow”: false,

“get_attributes”: true,

“get_checksum”: true,

“get_md5”: false,

“get_mime”: true,

“path”: “/opt/db/data”

}

},

“item”: “/opt/db/data”,

“stat”: {

“exists”: false

}

}

],

“skipped”: false

}

}

Walter

4

What are you trying to do at a high level?
While you can use ansible as a glorified shell wrapper or reporting tool, but its intended purpose is configuration management.
So in this case, what will you do if the condition DO meet the requirements?

5

once the conditions are met I want to proceed importing/including a role that installs postgres under that specified location.
This role expects the conditions to be met in order to run successfully