Notify service manager when start up is completed #1148
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neilalexander
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Not intentionally ignoring this PR BTW, but it has a knock-on effect to quite a few packages, so probably not for a patch release. |
klemensn
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Nov 3, 2024
| if _, err = notifyStartupCompleted(); err != nil { | ||
| log.Warnln("Error while sending start up notification:", err) | ||
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There is no guarantee at this point (in the main goroutine) that startup tasks in other goroutines have been finished, since they don't synchronise.
So I think you are just racing against tun(4) setup just like -chuser is already racing against the control socket setup over at #927 (comment)
klemensn
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Nov 3, 2024
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| if _, err = notifyStartupCompleted(); err != nil { |
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The first bool return value is never used, so why have it at all?
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Currently there is no way to notify service manager when yggdrasil start up process is truly completed, i.e its TUN interface and admin API endpoints are up and running. This makes naive services, set to depend on the yggdrasil network, periodically crash on startup, requiring sub-optimal complications for trivial tasks.
This PR solves the issue by notifying the service manager after TUN interface and admin sockets are ready. Systemd support is implemented by sending a short
READY=1message to a UNIX datagram socket defined in aNOTIFY_SOCKETenvironment variable, seesd_notify(3).Changes
cmd/yggdrasil/main.go- Added invocation fornotifyStartupCompletedright after TUN interface and admin sockets are set up.cmd/yggdrasil/notify_startup_*.go- AddednotifyStartupCompletedfunction handling the process on linux and immediately returning on other platforms.contrib/systemd/yggdrasil.service*- ServiceTypeis changed tonotify, added a comment aboutNotifyAccessproperty.