Asking on the openSUSE lists, I received the following proposal for an
alternative implementation that I propose for discussion,
Andreas
---------- Forwarded Message ----------
Subject: Re: [opensuse-packaging] Fwd: [systemd-devel] [RFC] Preset Files
Date: Friday, July 08, 2011, 19:31:07
From: Christian Boltz <opens...@cboltz.de>
To: opensuse-packag...@opensuse.org
Hello,
on Freitag, 8. Juli 2011, Robert Schweikert wrote:
> OK, did not know that and was not part of the original message.
> Well, using numbers works, still leaves one parsing all files for a
> specific service and then figuring out which one is processed last
> and wins. Allowing only one file or enable/disable pair of files
> makes that task a lot easier.
There is another way that can even avoid reading file contents ;-)
I propose to use two subdirectories "enabled" and "disabled", and then
just put empty files there, with filename = service name.
In other words: "touch disabled/cupsd.service" would mean cupsd is
disabled by default, and "touch enabled/sshd.service" would enable sshd
by default.
The default behaviour (if there is no service-specific default set)
could also stored with this method - just "touch enabled/DEFAULT".
Advantages of this method:
- you know exactly which files you have to check for a service - just
check for disabled/$service_name and enabled/$service_name.
- getting a full list for all services should be fast because you only
have to read the content of two directories, not any file content.
- easy to handle in packaging
- you'll never have any problems with invalid syntax inside the config
files ;-))
- you'll never get headache with file ordering
The only thing my proposal doesn't solve is if enabled or disabled
should win if both exist - but this issue exists in all proposals I've
seen until now. It's probably something that should be (or already is)
hardcoded in systemd.
Regards,
Christian Boltz
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Andreas Jaeger, Program Manager openSUSE
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