[OE-core] [PATCH] update-rc.d.bbclass: check that init script exists before running it

[Phil Blundell]

On Thu, 2016-10-06 at 11:49 +0300, Markus Lehtonen wrote:
> On Wed, 2016-10-05 at 16:51 +0200, Andreas Oberritter wrote:
> > Hello Markus,
> > 
> > On 05.10.2016 16:11, Markus Lehtonen wrote:
> > > Check that the init script that is going to be called in the
> > > prerm()
> > > script really exists. There might be a packaging bug or the
> > > script
> > > might've been removed already earlier in prerm().
> > 
> > isn't it called prerm in the first place because it's not supposed
> > to
> > remove any packaged files?
> 
> In the case of this bug it does not remove any packaged files. Update
> -alternatives removes a symlink (created by itself)

That arguably is a bug in u-a, which probably ought to be removing the
symlink in postrm not prerm.  If it removes the symlink too early and
prevents u-rc.d from running "stop" on it then you may end up with
dangling daemon processes still running after the package has been
uninstalled.  But...

> I think that the pre post etc scripts should basically never fail.

... this is essentially true, and having u-rc.d's own prerm fail
because of a bug in u-a definitely isn't going to improve the
situation.  So I think your patch is a good one.

p.

>