Ansible remove blank lines from list - ansible

Question

So I've got a playbook that retrieves the members of an AD group and gives me a list of their user IDs like this:
tasks:
- name: Get group members
set_fact:
member: "{{ item }}"
register: members
with_ldap:
- context: group_members
- Jira_Administrators_GG
- name: Get userids
set_fact:
userid: "{{ lookup('ldap', '{{ item.item }}', context='users') }}"
register: userids
with_items: "{{ members.results }}"
- name: Create list of userids
set_fact:
userid_list: "{{ userids.results | map(attribute='ansible_facts.userid') | list }}"
Trouble is I end up with a few blank lines in the resultant list:
- name: Show userids
debug:
msg: "{{ hostvars['localhost']['userid_list'] }}"
Output:
TASK [Show userids] **************************************
ok: [xxxxxxxxx01] => {
"msg": [
"xxxxxxxxx55",
"xxxxxxxxx58",
"xxxxxxxxx71",
[],
"xxxxxxxxx46",
[],
"xxxxxxxxx27",
[],
"xxxxxxxxx63",
"xxxxxxxxx27",
[],
"xxxxxxxxx04",
"xxxxxxxxx87"
]
}
Does anyone know how to remove the blank lines from the list? I've had a look through http://jinja.pocoo.org/docs/2.9/templates/#builtin-filters and tried a couple like replace() and rejectattr() in between the map and list but for whatever reason I'm not getting it right.
EDIT - Some attempts that didn't work...
I'm clearly not getting the syntax right with this one:
- name: Create list of userids
set_fact:
userid_list: "{{ userids.results | rejectattr('ansible_facts.userid', 'equalto', '') | map(attribute='ansible_facts.userid') | list }}"
..because the output was:
An exception occurred during task execution. To see the full traceback, use -vvv. The error was: TemplateRuntimeError: no test named ''
fatal: [localhost]: FAILED! => {"failed": true, "msg": "Unexpected failure during module execution.", "stdout": ""}
I then tried moving rejectattr() before map. This was better, it actually runs but doesn't seem to make any difference to the resultant list:
- name: Create list of userids
set_fact:
userid_list: "{{ userids.results | rejectattr('ansible_facts.userid', 'equalto', '') | map(attribute='ansible_facts.userid') | list }}"
I tried with reject() instead of rejectattr() like this:
- name: Create list of userids
set_fact:
userid_list: "{{ userids.results | reject('equalto', '') | map(attribute='ansible_facts.userid') | list }}"
...and like this:
- name: Create list of userids
set_fact:
userid_list: "{{ userids.results | map(attribute='ansible_facts.userid') | reject('equalto', '') | list }}"
I've tried a few permutations, I also tried comparing to '[]' instead of '' because my empty lines show like that in the resultant list. I guess I just don't understand how to apply the filters correctly.
EDIT - Variable contents
Now if I do
- debug:
var: userids
I get this (truncated to show 2 results that have userid populated and 1 with userid blank):
ok: [localhost] => {
"userids": {
"changed": false,
"msg": "All items completed",
"results": [
{
"_ansible_item_result": true,
"_ansible_no_log": false,
"ansible_facts": {
"userid": "xxxxxxxxx55"
},
"changed": false,
"item": {
"_ansible_item_result": true,
"_ansible_no_log": false,
"ansible_facts": {
"member": "CN=Liam Fitzpatrick,OU=My User OU,DC=my,DC=domain,DC=com"
},
"changed": false,
"item": "CN=Liam Fitzpatrick,OU=My User OU,DC=my,DC=domain,DC=com"
}
},
{
"_ansible_item_result": true,
"_ansible_no_log": false,
"ansible_facts": {
"userid": "xxxxxxxxx58"
},
"changed": false,
"item": {
"_ansible_item_result": true,
"_ansible_no_log": false,
"ansible_facts": {
"member": "CN=Mr Jones,OU=My User OU,DC=my,DC=domain,DC=com"
},
"changed": false,
"item": "CN=Mr Jones,OU=My User OU,DC=my,DC=domain,DC=com"
}
},
{
"_ansible_item_result": true,
"_ansible_no_log": false,
"ansible_facts": {
"userid": []
},
"changed": false,
"item": {
"_ansible_item_result": true,
"_ansible_no_log": false,
"ansible_facts": {
"member": "CN=Mr Smith,OU=My User OU,DC=my,DC=domain,DC=com"
},
"changed": false,
"item": "CN=Mr Smith,OU=My User OU,DC=my,DC=domain,DC=com"
}
}

Answer 1

You have a list of strings (e.g. "xxxxxxxxx63") and empty lists ([]) – not empty strings.
You can use Jinja2 select/reject filters, for example:
- name: Create list of userids
set_fact:
userid_list: "{{ userids.results | map(attribute='ansible_facts.userid') | select('string') | list }}"
P.S. and avoid nested curly brackets, use:
"{{ lookup('ldap', item.item, context='users') }}"