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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
package feature
import (
"runtime"
"tailscale.com/feature/buildfeatures"
)
// HookSystemdReady sends a readiness to systemd. This will unblock service
// dependents from starting.
var HookSystemdReady Hook[func()]
// HookSystemdStatus holds a func that will send a single line status update to
// systemd so that information shows up in systemctl output.
var HookSystemdStatus Hook[func(format string, args ...any)]
// SystemdStatus sends a single line status update to systemd so that
// information shows up in systemctl output.
//
// It does nothing on non-Linux systems or if the binary was built without
// the sdnotify feature.
func SystemdStatus(format string, args ...any) {
if !CanSystemdStatus { // mid-stack inlining DCE
return
}
if f, ok := HookSystemdStatus.GetOk(); ok {
f(format, args...)
}
}
// CanSystemdStatus reports whether the current build has systemd notifications
// linked in.
//
// It's effectively the same as HookSystemdStatus.IsSet(), but a constant for
// dead code elimination reasons.
const CanSystemdStatus = runtime.GOOS == "linux" && buildfeatures.HasSDNotify
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