add login-only configless tests

Author: sjpb

molecule/test8/INSTALL.rst

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+*******
+Docker driver installation guide
+*******
+
+Requirements
+============
+
+* Docker Engine
+
+Install
+=======
+
+Please refer to the `Virtual environment`_ documentation for installation best
+practices. If not using a virtual environment, please consider passing the
+widely recommended `'--user' flag`_ when invoking ``pip``.
+
+.. _Virtual environment: https://virtualenv.pypa.io/en/latest/
+.. _'--user' flag: https://packaging.python.org/tutorials/installing-packages/#installing-to-the-user-site
+
+.. code-block:: bash
+
+    $ python3 -m pip install 'molecule[docker]'

molecule/test8/converge.yml

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+---
+- name: Converge
+  hosts: all
+  tasks:
+    - name: "Include ansible-role-openhpc"
+      include_role:
+        name: "ansible-role-openhpc/"
+      vars:
+        openhpc_enable:
+          control: "{{ inventory_hostname in groups['testohpc_control'] }}"
+          batch: "{{ inventory_hostname in groups['testohpc_compute'] }}"
+          login: "{{  inventory_hostname in groups['testohpc_login'] }}"
+          runtime: true
+        openhpc_slurm_control_host: "{{ groups['testohpc_control'] | first }}"
+        openhpc_slurm_partitions:
+          - name: "compute"
+        openhpc_cluster_name: testohpc
+        openhpc_slurm_configless: true
+

molecule/test8/molecule.yml

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+---
+name: single partition, group is partition
+driver:
+  name: docker
+platforms:
+  - name: testohpc-control
+    image: ${MOLECULE_IMAGE}
+    pre_build_image: true
+    groups:
+      - testohpc_control
+    command: /sbin/init
+    tmpfs:
+      - /run
+      - /tmp
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:ro
+    networks:
+      - name: net1
+      
+  - name: testohpc-login-0
+    image: ${MOLECULE_IMAGE}
+    pre_build_image: true
+    groups:
+      - testohpc_login
+    command: /sbin/init
+    tmpfs:
+      - /run
+      - /tmp
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:ro
+    networks:
+      - name: net1
+
+  - name: testohpc-login-1
+    image: ${MOLECULE_IMAGE}
+    pre_build_image: true
+    groups:
+      - testohpc_login
+    command: /sbin/init
+    tmpfs:
+      - /run
+      - /tmp
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:ro
+    networks:
+      - name: net1
+  
+  - name: testohpc-compute-0
+    image: ${MOLECULE_IMAGE}
+    pre_build_image: true
+    groups:
+      - testohpc_compute
+    command: /sbin/init
+    tmpfs:
+      - /run
+      - /tmp
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:ro
+    networks:
+      - name: net1
+  - name: testohpc-compute-1
+    image: ${MOLECULE_IMAGE}
+    pre_build_image: true
+    groups:
+      - testohpc_compute
+    command: /sbin/init
+    tmpfs:
+      - /run
+      - /tmp
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:ro
+    networks:
+      - name: net1
+provisioner:
+  name: ansible
+verifier:
+  name: ansible

molecule/test8/verify.yml

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+---
+
+- name: Check slurm hostlist
+  hosts: testohpc_login # NB for this test this is 2x non-control nodes, so tests they can contact slurmctld too
+  tasks:
+  - name: Get slurm partition info
+    command: sinfo --noheader --format="%P,%a,%l,%D,%t,%N" # using --format ensures we control whitespace
+    register: sinfo
+  - name: 
+    assert:                        # PARTITION AVAIL  TIMELIMIT  NODES  STATE NODELIST
+      that: "sinfo.stdout_lines == ['compute*,up,60-00:00:00,2,idle,testohpc-compute-[0-1]']"
+      fail_msg: "FAILED - actual value: {{ sinfo.stdout_lines }}"