Removing conflicts of init system

[Lorenz]

Josh Triplett <josh at joshtriplett.org> ha scritto:
> sysvinit works similarly, with /lib/sysvinit/init
This was in Jessie, but I don't see any /lib/sysvinit/init in Stretch nor
in Sid,
it's /sbin/init now, am I wrong?

Dmitry Bogatov wrote:
>I propose to replace current approach with update-alternatives(1)
>approach.  By coordinated effort of present init systems (in thread), we
>introduce master link /sbin/init and number of slave links:
>
>       /sbin/halt
>      /sbin/poweroff
>      ....

A slightly different approach is also possible:
Ship only /sbin/init as a alternative link ("the default init" as user
choice)
and ship in `init-system-helpers' the following

        /sbin/halt
        /sbin/poweroff
        /sbin/reboot
        /sbin/runlevel
        /sbin/shutdown

as programs that check for the current running init and
then execute the proper command. For example
/sbin/reboot
#!/bin/sh
# systemd
if [ -d /run/systemd/system ]; then
   exec /bin/systemctl reboot
fi

#sysv
if [ -p /run/initctl ]; then
   exec /sbin/sysv-reboot
fi

#runit
if [ -e /run/runit.stopit ]; then
   exec /sbin/runit-init 6
fi

#openrc
#if [ test for openrc ]
#     exec 'openrc code for reboot'
# fi

Of course this require that each init rename it's /sbin/reboot
into something else: systemd already comply, sysv and runit
require some change, and I don't know about Openrc.
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