[Buildroot] issues without busybox

[Gustavo Zacarias <gustavo@zacarias.com.ar>]

On 07/21/2014 05:15 PM, Thomas Petazzoni wrote:
> I believe one direction we should potentially investigate is to have
> one common skeleton for the base stuff, and then separate additional
> skeletons for busybox init, sysv init and systemd init.

Hi.
I think i've already mentioned i'm planning on a proposal to revamp the
init system/initscript options.
The idea would be to make them consistent and document how a proper
initscript should be made, and get them all in line with this.
Also interesting would be to make them configurable, in many cases
daemons have options and don't use a configuration file, so let's make
one i say. Actually let's make two :) A default file for read-only
filesystem, and some another that overrides the default, good for RO
filesystems which have a separate partition for that.
We could make the start/stop order configurable too via a file similar
to the device table, if this file lives in the target filesystem it
could be nicer too - but well that depends on how far we'd like to go.
The idea would be to use as much pure shell as possible for this to keep
necessary dependencies to a minimum.
Haven't thought out much of the systemd option yet, i need to dig
somewhat deeper into it, or it could be handled separately since it's
quite different from the usual inits.

> Regarding the specific issues you're raising here, I'm not exactly sure
> how to solve them:
> 
>  * For the network, we could make sysvinit depend on ifupdown, but this
>    sounds a bit strong. Then it would mean that we should make the init
>    script installation conditional. Or maybe installed just by ifupdown
>    on one side, and busybox on the other side?

We can make the different BR2_INIT_* options select what's appropiate,
if someone wants to "roll their own" they can select None.

>  * Regarding start-stop-daemon, I believe all (most?) our init scripts
>    rely on start-stop-daemon. So I'm not sure how to handle that...

We can throw a compatibility function/alias/script for different scenarios.
But i think getting what we want to do on a clean sheet would be best,
and then work on the patches.
Regards.