From 05d56bccd7067b02c4692e94eaddb38886251921 Mon Sep 17 00:00:00 2001
From: Daniel Pawlik <dpawlik@redhat.com>
Date: Mon, 20 Mar 2023 08:24:46 +0100
Subject: [PATCH] Create LVM on loop device to deploy Openshift Storage

The Openshift Storage that uses topolvm was raising an error, because
the Microshift host does not have any LVM device. In previous role
stage, we just remove the openshift-storage namespace and storageclass,
because the CI tests mostly were using local storage for PV.
---
 defaults/main.yaml                          |  6 +-
 tasks/main.yaml                             |  3 +-
 tasks/openshift-storage.yaml                | 82 +++++++++++++++++----
 tasks/pre.yaml                              |  1 +
 templates/microshift-loop-device.service.j2 | 16 ++++
 5 files changed, 91 insertions(+), 17 deletions(-)
 create mode 100644 templates/microshift-loop-device.service.j2

diff --git a/defaults/main.yaml b/defaults/main.yaml
index 0cc823f..99d8505 100644
--- a/defaults/main.yaml
+++ b/defaults/main.yaml
@@ -32,5 +32,9 @@ standard_user:
   namespace: dev-admin
   role: admin
 
-delete_openshift_storage: true
+delete_openshift_storage: false
+disk_file_path: /mnt/microshift-storage-file
+disk_file_size: 20G
+vg_name: rhel
+
 overwrite_container_policy: false
diff --git a/tasks/main.yaml b/tasks/main.yaml
index c9c16a2..f17a1fd 100644
--- a/tasks/main.yaml
+++ b/tasks/main.yaml
@@ -47,6 +47,5 @@
   ansible.builtin.include_tasks: standard-user.yaml
   when: standard_user
 
-- name: Delete openshift storage
+- name: Create lvm or delete openshift storage
   ansible.builtin.include_tasks: openshift-storage.yaml
-  when: delete_openshift_storage
diff --git a/tasks/openshift-storage.yaml b/tasks/openshift-storage.yaml
index b59b965..d30cb6d 100644
--- a/tasks/openshift-storage.yaml
+++ b/tasks/openshift-storage.yaml
@@ -1,15 +1,69 @@
 ---
-# NOTE: The Openshift storage uses topolvm, that requires additional volume,
-# which is not necessary for us, due we mostly use that playbook for CI.
-- name: Check if openshift-storage namespace exists
-  ansible.builtin.command: oc get namespace openshift-storage
-  register: _openshift_storage_ns
-  failed_when: _openshift_storage_ns.rc not in [0, 1]
-
-- name: Delete openshift storage namespace
-  ansible.builtin.command: oc delete namespace openshift-storage
-  when: _openshift_storage_ns.rc == 0
-
-- name: Delete topolvm-provisioner storageclass
-  ansible.builtin.command: oc delete storageclass topolvm-provisioner
-  when: _openshift_storage_ns.rc == 0
+- name: Delete openshift-storage if needed
+  when: delete_openshift_storage
+  block:
+    # NOTE: The Openshift storage uses topolvm, that requires additional volume,
+    # which is not necessary for us, due we mostly use that playbook for CI.
+    - name: Check if openshift-storage namespace exists
+      ansible.builtin.command: oc get namespace openshift-storage
+      register: _openshift_storage_ns
+      failed_when: _openshift_storage_ns.rc not in [0, 1]
+
+    - name: Delete openshift storage namespace
+      ansible.builtin.command: oc delete namespace openshift-storage
+      when: _openshift_storage_ns.rc == 0
+
+    - name: Delete topolvm-provisioner storageclass
+      ansible.builtin.command: oc delete storageclass topolvm-provisioner
+      when: _openshift_storage_ns.rc == 0
+
+- name: Create LVM on loop device to deploy openshift storage with topolvm
+  when: not delete_openshift_storage
+  block:
+    - name: Check if file already exists
+      become: true
+      stat:
+        path: "{{ disk_file_path }}"
+      register: _disk_file
+
+    - name: Create loop disk
+      when: not _disk_file.stat.exists
+      block:
+        - name: Create empty file
+          become: true
+          community.general.filesize:
+            path: "{{ disk_file_path }}"
+            size: "{{ disk_file_size }}"
+
+        - name: Make partition on empty file
+          become: true
+          community.general.parted:
+            device: "{{ disk_file_path }}"
+            number: 1
+            state: present
+            flags: ["lvm"]
+
+        - name: Get first available loop device
+          become: true
+          ansible.builtin.command: losetup -f
+          register: loop_device
+
+        - name: Create loop device service
+          become: true
+          ansible.builtin.template:
+            src: microshift-loop-device.service.j2
+            dest: /usr/lib/systemd/system/microshift-loop-device.service
+
+        - name: Enable loop device service
+          become: true
+          ansible.builtin.systemd:
+            name: microshift-loop-device
+            state: started
+            enabled: true
+            daemon_reload: true
+
+        - name: Create volume group
+          become: true
+          community.general.lvg:
+            vg: "{{ vg_name }}"
+            pvs: "{{ loop_device.stdout }}"
diff --git a/tasks/pre.yaml b/tasks/pre.yaml
index 24856e1..1aa2754 100644
--- a/tasks/pre.yaml
+++ b/tasks/pre.yaml
@@ -12,6 +12,7 @@
       - git
       - golang
       - python3-cryptography
+      - lvm2
     state: present
 
 - name: Add host to the hosts file
diff --git a/templates/microshift-loop-device.service.j2 b/templates/microshift-loop-device.service.j2
new file mode 100644
index 0000000..0941fcc
--- /dev/null
+++ b/templates/microshift-loop-device.service.j2
@@ -0,0 +1,16 @@
+[Unit]
+Description=Setup loopback device
+DefaultDependencies=no
+Conflicts=umount.target
+Before=local-fs.target umount.target microshift.service
+
+[Service]
+ExecStart=/sbin/losetup {{ loop_device.stdout }} {{ disk_file_path }}
+ExecStop=/sbin/losetup -d {{ loop_device.stdout }}
+Type=oneshot
+TimeoutSec=60
+RemainAfterExit=yes
+
+[Install]
+WantedBy=local-fs-pre.target
+Also=systemd-udevd.service