重新启动单元文件时，模式和通道应该是什么

Question

In go-systemd, what should be the second and third parameters for restarting the units.

// RestartUnit restarts a service.  If a service is restarted that isn't
// running it will be started.
func (c *Conn) RestartUnit(name string, mode string, ch chan<- string)    (int, error) {
return c.startJob(ch, "org.freedesktop.systemd1.Manager.RestartUnit", name, mode)
}

Answer 1

From PR 203, you can see that method used/tested as:

// Restart the unit
reschan = make(chan string)
_, err = conn.RestartUnit(target, "replace", reschan)
if err != nil {
    t.Fatal(err)
}

job = <-reschan
if job != "done" {
    t.Fatal("Job is not done:", job)
}

So you have to create your own label and channel.

From dbus/methods.go

// Takes the unit to activate, plus a **mode string**. 

The mode needs to be one of:

• replace (the call will start the unit and its dependencies, possibly replacing already queued jobs that conflict with this),
• fail (the call will start the unit and its dependencies, but will fail if this would change an already queued job),
• isolate (the call will start the unit in question and terminate all units that aren't dependencies of it),
• ignore-dependencies (it will start a unit but ignore all its dependencies),
• ignore-requirements (it will start a unit but only ignore the requirement dependencies).

It is not recommended to make use of the latter two options.