Fix i2c rtc

roles/i2c-clock/files/etc/systemd/system/rtc-i2c.service

@@ -4,7 +4,8 @@ ConditionVirtualization=!container
 DefaultDependencies=no
 Wants=dev-rtc_i2c.device
 After=dev-rtc_i2c.device
-Before=systemd-timesyncd.service ntpd.service chrony.service
+Before=sysinit.target
+Conflicts=shutdown.target
 
 [Service]
 Type=oneshot
@@ -12,10 +13,10 @@ CapabilityBoundingSet=CAP_SYS_TIME
 PrivateTmp=yes
 ProtectSystem=full
 ProtectHome=yes
-DeviceAllow=/dev/rtc_i2c rw
+DeviceAllow=/dev/rtc rw
 DevicePolicy=closed
-ExecStartPre=/usr/bin/echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-1/new_device
-ExecStart=/sbin/hwclock -s
+ExecStart=/bin/sh -c "/usr/bin/echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-1/new_device"
+ExecStartPost=/usr/bin/logger --tag rtc-i2c 'System clock set from i2c hardware clock'
 
 [Install]
-WantedBy=time-sync.target
+WantedBy=sysinit.target

roles/i2c-clock/tasks/install.yml

@@ -7,6 +7,12 @@
         update_cache: yes
         pkg:
           - i2c-tools
+          - libraspberrypi-bin
+
+    - name: enable i2c-rtc dtoverlay
+      shell:
+        cmd: |
+          dtoverlay i2c-rtc
 
     - name: enable automatic module load
       copy:
@@ -18,8 +24,13 @@
         src: etc/systemd/system/rtc-i2c.service
         dest: /etc/systemd/system/rtc-i2c.service
 
+    - name: disable systemd service
+      systemd:
+        daemon_reload: yes
+        name: rtc-i2c.service
+        enabled: no
+
     - name: enable systemd service
       systemd:
         name: rtc-i2c.service
         enabled: yes
-        state: started

roles/i2c-clock/tasks/set-time.yml

@@ -1,5 +1,11 @@
 ---
+- name: Check if rtc is loaded
+  stat:
+    path: /dev/rtc
+  register: rtc_file
+
 - become: yes
+  when: rtc_file.stat.exists == False
   block:
     - name: load hwclock
       shell: