Lennart Poettering
d36bdc9467
Define a new io.systemd.SysUpdate.Notify Varlink interface with a single OnCompletedUpdate() method, and after sysupdate successfully installs an update, invoke that method on every socket linked into /run/systemd/sysupdate/notify/ via varlink_execute_directory(). This gives other components a hook to react to applied updates (e.g. recompute a TPM policy, link a freshly downloaded kernel, refresh extensions). The notification carries the component name, the installed version and the list of updated resources (transfer id + on-disk path). Subscribers are free to ignore the parameters and just treat the call as a trigger. Setting SYSTEMD_SYSUPDATE_FORCE_NOTIFY=1 forces the notification to be sent even when no update was applied (in which case no resource list is included), so follow-up work can be triggered unconditionally. Fixes: #35988
System and Service Manager
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