[Unit]
ConditionCapability=CAP_SYS_TIME
ConditionVirtualization=!container
DefaultDependencies=no
Wants=dev-rtc_i2c.device
After=dev-rtc_i2c.device
Before=sysinit.target
Conflicts=shutdown.target

[Service]
Type=oneshot
CapabilityBoundingSet=CAP_SYS_TIME
PrivateTmp=yes
ProtectSystem=full
ProtectHome=yes
DeviceAllow=/dev/rtc rw
DevicePolicy=closed
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=sysinit.target