MicroOS with single disk

ansible-kvm-vms/roles/os_config/templates/microos_ignition.bu.j2

@@ -7,17 +7,6 @@ passwd:
       ssh_authorized_keys:
         - "{{ lookup('file', vm_ssh_public_key) | trim }}"
 storage:
-  disks:
-    - device: /dev/vdb
-      wipe_table: true
-      partitions:
-        - label: ext-data
-          number: 1
-  filesystems:
-    - device: /dev/vdb1
-      format: btrfs
-      label: ext-pool
-      wipe_filesystem: true
   files:
     - path: /etc/ssh/sshd_config.d/permit_root_login.conf
       mode: 0644
@@ -36,12 +25,12 @@ systemd:
 
         [Service]
         Type=oneshot
-        ExecStartPre=/usr/bin/mkdir -p /run/mnt-ext-init
-        ExecStartPre=/usr/bin/mount LABEL=ext-pool /run/mnt-ext-init
+        ExecStartPre=/usr/bin/mkdir -p /run/mnt-root-init
+        ExecStartPre=/usr/bin/mount -o subvolid=5 /dev/disk/by-label/ROOT /run/mnt-root-init
         # Hier werden die Subvolumes @home angelegt, falls sie nicht existieren
-        ExecStart=/usr/bin/bash -c "for sub in @home; do [ -d /run/mnt-ext-init/\$$sub ] || /usr/sbin/btrfs subvolume create /run/mnt-ext-init/$$sub; done"
-        ExecStartPost=/usr/bin/umount /run/mnt-ext-init
-        ExecStartPost=/usr/bin/rmdir /run/mnt-ext-init
+        ExecStart=/usr/bin/bash -c "for sub in @home; do [ -d /run/mnt-root-init/\$$sub ] || /usr/sbin/btrfs subvolume create /run/mnt-root-init/$$sub; done"
+        ExecStartPost=/usr/bin/umount /run/mnt-root-init
+        ExecStartPost=/usr/bin/rmdir /run/mnt-root-init
         RemainAfterExit=true
 
         [Install]
@@ -55,7 +44,7 @@ systemd:
         Before=local-fs.target
 
         [Mount]
-        What=LABEL=ext-pool
+        What=/dev/disk/by-label/ROOT
         Where=/home
         Type=btrfs
         Options=defaults,subvol=@home