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Jan Čermák
e6d5dc0110
The persistent timesyncd configuration is a single bind-mounted file over /etc/systemd/timesyncd.conf. The NTP configuration through OS Agent (home-assistant/os-agent#207) attempted to do atomic updates, but a temporary file cannot be created next to it in the read-only /etc/systemd, and replacing the file in the overlay directly changes the inode, so the bind mount keeps pointing to the old content. Also, a persisted copy of the whole file means changes to the shipped defaults never reach existing installations. Bind-mount the /etc/systemd/timesyncd.conf.d directory from the overlay instead and keep the shipped timesyncd.conf read-only. Configuration is layered as drop-ins, from lowest priority to higher: * 10-ntp.conf (in /run): NTP servers from DHCP * 20-custom.conf: timesyncd.conf imported from the CONFIG partition * 50-os-agent.conf: NTP servers set through the OS Agent D-Bus API On upgrade, settings from the previously persisted timesyncd.conf other than the shipped defaults are moved to 20-custom.conf. This migration can be removed later (with #4986). 50-os-agent.conf should be only managed by OS Agent, so we don't need to care about user's edits. Finally, if needed, drop-ins with higher priorities can be added for complex customizations. Refs home-assistant/supervisor#6278