[arch-dev-public] JAVA_HOME in systemd

[Tom Gundersen]

On Feb 6, 2013 3:09 PM, "Guillaume ALAUX" <guillaume at archlinux.org> wrote:
>
> On 6 February 2013 15:08, Guillaume ALAUX <guillaume at archlinux.org> wrote:
> > ---------- Forwarded message ----------
> > From: Leonidas Spyropoulos <artafinde at gmail.com>
> > Date: 6 February 2013 14:52
> > Subject: Re: [arch-dev-public] JAVA_HOME in systemd
> > To: guillaume at archlinux.org
> >
> >
> > On Wed, Feb 6, 2013 at 1:36 PM, Jan Steffens <jan.steffens at gmail.com>
wrote:
> >> On Wed, Feb 6, 2013 at 1:58 PM, Gaetan Bisson <bisson at archlinux.org>
wrote:
> >>> You can always have each Java runtime provide a different file, and
> >>> include all of them in each Java service file using
> >>>
> >>>         EnvironmentFile=-/path/to/java/runtime/number/one
> >>>         EnvironmentFile=-/path/to/java/runtime/number/two
> >>>
> >>> etc.
> >>
> >> You can also pass a wildcard expression, avoiding hardcoding several
files,
> >> maybe like this:
> >>
> >> EnvironmentFile=-/etc/java-runtime.d/*
> >> EnvironmentFile=-/etc/java-runtime
> >>
> >> Needs testing, but could allow the user to set a default runtime via
symlink.
> >>
> >> Alternatively, just EnvironmentFile=/etc/java-runtime and create this
symlink
> >> at post_install of every java-runtime, if it doesn't exist already.
> >> To be tidy, post_remove then deletes the file if java-runtime.d
> >> doesn't exist anymore.
> >
> > I can't send to mailing list as I am not a dev / TU.
> > Isn't it possible to detect the JDK on runtime? Getting it from the
> > java command? (or the javac command)
> >
> > --
> > Caution: breathing may be hazardous to your health.
> >
> > #include <stdio.h>
> > int main(){printf("%s","\x4c\x65\x6f\x6e\x69\x64\x61\x73");}
>
> The point is to enable the user to statically set which JRE must be
> used. Detecting it at each java app runtime would not be ideal.
>
> And I'd also rather not have to list all potential JRE in all java
> systemd files.
>
> Creating a symlink at post_install if it does not already exist looks
> nice to me.

The symlink seems reasonable to me. It would be nice if all the
distros/upstreams could agree on a scheme though as this does not sound
Arch/systemd specific.

Cheers,

Tom