Get multiple file contents to one Ansible variable

On Ubuntu 18 server in directory /home/adminuser/keys are 5 files that contain key parts:

/home/adminuser/key/
|-  unseal_key_0
|-  unseal_key_1
|-  unseal_key_2
|-  unseal_key_3
|-  unseal_key_4

File contents:

1bbeaafab5037a287bde3e5203c8b2cd205f4cc55b4fcffe7931658dc20d8cdcdf
bdf7a6ee4c493aca5b9cc2105077ec67738a0e8bf21936abfc5d1ff8080b628fcb
545c087d3d59d02556bdbf8690c8cc9faafec0e9766bb42de3a7884159356e91b8
053207b0683a8a2886129f7a1988601629a9e7e0d8ddbca02333ce08f1cc7b3887
2320f6275804341ebe5d39a623dd309f233e454b4453c692233ca86212a3d40b5f

Part of Ansible playbook (task):

- name: Reading file contents
      command: cat {{item}}
      register: unseal_keys
      with_fileglob: "/home/adminuser/keys/*"

The error that I get:

> "[WARNING]: Unable to find '/home/adminuser/keys' in expected paths (use -vvvvv to see paths)"

I have tried to:

• change user that creates directory and files
• change path to /home/adminuser/keys/ and /home/adminuser/keys

I expect all of the file contents (that is parts of a single key) to be merged into one string:

1bbeaafab5037a287bde3e5203c8b2cd205f4cc55b4fcffe7931658dc20d8cdcdfbdf7a6ee4c493aca5b9cc2105077ec67738a0e8bf21936abfc5d1ff8080b628fcb545c087d3d59d02556bdbf8690c8cc9faafec0e9766bb42de3a7884159356e91b8 053207b0683a8a2886129f7a1988601629a9e7e0d8ddbca02333ce08f1cc7b38872320f6275804341ebe5d39a623dd309f233e454b4453c692233ca86212a3d40b5f

<sup>

Given the files below for testing

shell> tree /tmp/admin/
/tmp/admin/
└── key
    ├── key_0
    ├── key_1
    └── key_2

1 directory, 3 files

shell> cat /tmp/admin/key/key_0
abc

shell> cat /tmp/admin/key/key_1
def

shell> cat /tmp/admin/key/key_2
ghi

</sup>

<hr>

Use the module assemble to: "assemble a configuration file from fragments."

Declare the path

  key_all_path: /tmp/admin/key_all

and assemble the fragments

    - assemble:
        src: /tmp/admin/key
        dest: "{{ key_all_path }}"

This will create the file /tmp/admin/key_all

shell> cat /tmp/admin/key_all 
abc
def
ghi

Read the file and join the lines. Declare the variable

  key_all: "{{ lookup('file', key_all_path).splitlines()|join('') }}"

gives

  key_all: abcdefghi

<hr>

Example of a complete playbook for testing

<sup>

- hosts: localhost

  vars:

    key_all_path: /tmp/admin/key_all
    key_all: "{{ lookup('file', key_all_path).splitlines()|join('') }}"

  tasks:

    - assemble:
        src: /tmp/admin/key
        dest: "{{ key_all_path }}"

    - debug:
        var: key_all

</sup>

Thanks !
Problem was in paths and hosts where task had to be executed.
Problem is solved by locating and reading files localy and executing this task:

- name: Reading file contents
  command: cat "{{item}}"
  register: keys                       ----> all file contents to variable "keys"
  with_fileglob: "~/keys/*"            ----> this is path to directory all files are storedon my local machine
   delegate_to: localhost              ----> here I specify that this task will be executed on local machine
  become: false                        ----> remove sudo so that password is not requested