Re: [gentoo-dev] Reusing systemd unit file format / forking systemd

[Sergei Trofimovich <slyfox@gentoo.org>]

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On Sun, 26 May 2013 13:59:34 +0200
Luca Barbato <lu_zero@gentoo.org> wrote:

> On 5/26/13 1:15 PM, Michał Górny wrote:
> > I'd suspect this is mostly with the growing irritation of systemd
> > haters who spawn endless threads about how they hate anything with
> > 'systemd' name in it. Plus the people who try hard to port the mistakes
> > of OpenRC init scripts to systemd services files.
> 
> Here we have a problem, the people that need more flexibility to 
> actually get work done will see that the inflexibility of the unit 
> format will bite them and bite them hard.
> 
> A simple example is something fairly easy for a runscript and quite 
> annoying for an unit, multiple instances.
> 
> for openrc you can just symlink using a proper pattern and have the 
> initscript figure the right configuration and which user/chroot use to 
> drop the daemon.

You need to name a unit with @ suffix, like openvpn@.service:

    $ cat /etc/systemd/system/openvpn@.service 
    [Service]
    Type=simple
    ExecStart=/usr/sbin/openvpn --user openvpn --group openvpn --cd /etc/openvpn --chroot /var/run/openvpn --config %I.conf

feel free to sprinkle %i (and others) for templating.

and symlink it as you like. openvpn@foo.service (or openvpn@foo)
will be direct analogue to openvpn.foo. (+ foo.service.d with the same(?) override semantics)

> for systemd you have to copy and edit since most fields are immutable 
> (some are with special rules).

    .include /path/to/unit
    OverrideedField = OverridedValue
will not help here, right?

-- 

  Sergei

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