[Slackbuilds-users] Starting a daemon in rc

[Jeremy Hansen]

On Fri, Mar 10, 2023, 9:11 AM <phalange at komputermatrix.com> wrote:

> On 2023-03-10 10:06, Ruben Schuller wrote:
> > Hi!
> >
> > 2023-03-10 phalange at komputermatrix.com:
> >
> >> I have slackbuild for tailscale that includes a daemon. The daemon
> >> should ideally be started by the init system. But it requires an
> >> internet connection, and in the case of using wifi, starting this
> >> daemon from rc.local halts the init -- *I think* because it's
> >> searching for a connection before wifi is connected.
> >>
> >> Any suggestions for starting a daemon like this?
> >
> > You could try the "daemon" package for this, it's shipped with
> > Slackware
> > and works pretty well! Here's how I do it for my dendrite SlackBuild
> > (not on SBo yet):
> >
> > ----8<-------------------------------
> > #!/bin/sh
> >
> > if [ -f /etc/default/dendrite ]; then
> >       . /etc/default/dendrite
> > fi
> >
> > dendrite_start() {
> >   if [ -x /usr/bin/dendrite-monolith-server ]; then
> >       daemon -n dendrite -u dendrite -- dendrite-monolith-server-tls-key
> > $TLSKEY -tls-cert $TLSCERT -config /etc/dendrite/dendrite.yaml
> >   fi
> > }
> >
> > dendrite_stop() {
> >       daemon -n dendrite -u dendrite --stop
> > }
> >
> > dendrite_restart() {
> >   dendrite_stop
> >   sleep 1
> >   dendrite_start
> > }
> >
> > case "$1" in
> > 'start')
> >   dendrite_start
> >   ;;
> > 'stop')
> >   dendrite_stop
> >   ;;
> > 'restart')
> >   dendrite_restart
> >   ;;
> > *)
> >   echo "usage $0 start|stop|restart"
> > esac
> > ----8<-------------------------------
> >
> > I'm not sure how to handle the waiting for the network. I suppose you
> > could add something which checks if network manager is connected, but
> > be aware that there are people (myself included) who use the classic
> > Slackware network scripts for this and it wouldn't work. Maybe you
> > could add something which pings the tailscale servers, you are going
> > to connect to them anyway.
> >
> > Cheers
> > Ruben
> > _______________________________________________
> > SlackBuilds-users mailing list
> > SlackBuilds-users at slackbuilds.org
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>
> Thanks Ruben, I appreciate the idea. Doesn't this require the user to
> issue a command still?
>
> -AP
>

Personally, I'd just make a note of it in the README.

For people using Slackware's networking scripts, you could just add a
simple command to rc.local.

if [ -x /etc/rc.d/rc.tailscale ]; then
  /etc/rc.d/rc.tailscale start
fi

For people using NetworkManager, they could add a script (maybe
00-tailscale.sh) to /etc/NetworkManager/dispatcher.d/ containing something
like:

if [ "$2" = "up" ]; then
  if [ -x /etc/rc.d/rc.tailscale ]; then
    /etc/rc.d/rc.tailscale start
  fi
fi

I don't use NetworkManager, but I believe that is the correct format.

Jeremy
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