DSOS-2749: add filesystems role (#725)

* DSOS-2749: add role for managing filesystems

* tweaks

* updated readme

ansible/roles/filesystems/README.md

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+# Role for managing file shares
+
+## Mount EFS file shares
+
+In appropriate `group_vars`, e.g.
+
+Multi-AZ:
+```
+filesystems_mount:
+  - dir: /test
+    fstype: nfs
+    opts: nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport,nofail
+    src: "{{ ansible_ec2_placement_availability_zone }}.fs-0a170471eea499c2c.efs.eu-west-2.amazonaws.com:/"
+```
+
+Single-AZ, e.g. in eu-west-2a
+```
+filesystems_mount:
+  - dir: /test
+    fstype: nfs
+    opts: nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport,nofail
+    src: "eu-west-2a.fs-0a170471eea499c2c.efs.eu-west-2.amazonaws.com:/"
+```

ansible/roles/filesystems/defaults/main.yml

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+---
+# Define list of filesystems to mount using `filesystems_mount` list.
+
+# Example Multi-AZ EFS mount
+#filesystems_mount:
+#  - dir: /test
+#    fstype: nfs
+#    opts: nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport,nofail
+#    src: "{{ ansible_ec2_placement_availability_zone }}.fs-0a170471eea499c2c.efs.eu-west-2.amazonaws.com:/"
+
+# Example Single-AZ EFS mount in eu-west-2a
+#filesystems_mount:
+#  - dir: /test
+#    fstype: nfs
+#    opts: nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport,nofail
+#    src: "eu-west-2a.fs-0a170471eea499c2c.efs.eu-west-2.amazonaws.com:/"

ansible/roles/filesystems/meta/main.yml

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+---
+dependencies:
+  - role: get-ec2-facts

ansible/roles/filesystems/tasks/main.yml

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+---
+- import_tasks: mount.yml
+  tags:
+    - amibuild
+    - ec2provision
+    - ec2patch
+  when: filesystems_mount is defined

ansible/roles/filesystems/tasks/mount.yml

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+---
+- name: Install packages
+  ansible.builtin.package:
+    name: "{{ item }}"
+    state: present
+  loop:
+    - nfs-utils
+    - cifs-utils
+
+- name: Create mount point
+  ansible.builtin.file:
+    path: "{{ item.dir }}"
+    state: "directory"
+  loop_control:
+    label: "{{ item.dir }}"
+  loop: "{{ filesystems_mount }}"
+
+- name: Mount filesystem
+  ansible.posix.mount:
+    fstype: "{{ item.fstype }}"
+    opts: "{{ item.opts | default('defaults,nofail') }}"
+    path: "{{ item.dir }}"
+    src: "{{ item.src }}"
+    state: "{{ item.state | default('mounted') }}"
+  loop_control:
+    label: "{{ item.dir }}"
+  loop: "{{ filesystems_mount }}"