linux-kernel - Re: [PATCH] builddeb: introduce variables for control-file customization

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Message-ID: <1512398147.2768.20.camel@decadent.org.uk>
Date:   Mon, 04 Dec 2017 14:35:47 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     Henning Schild <henning.schild@...mens.com>
Cc:     linux-kernel@...r.kernel.org,
        Ben Hutchings <ben.hutchings@...ethink.co.uk>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kbuild@...r.kernel.org,
        Konrad Schwarz <konrad.schwarz@...mens.com>
Subject: Re: [PATCH] builddeb: introduce variables for control-file
 customization

On Mon, 2017-12-04 at 10:01 +0100, Henning Schild wrote:
> Am Fri, 1 Dec 2017 18:47:38 +0000
> schrieb Ben Hutchings <ben@...adent.org.uk>:
> 
> > On Fri, 2017-12-01 at 19:34 +0100, Henning Schild wrote:
> > > Am Fri, 1 Dec 2017 16:51:12 +0000
> > > schrieb Ben Hutchings <ben@...adent.org.uk>:
> > >   
> > > > On Fri, 2017-12-01 at 15:56 +0000, Henning Schild wrote:  
> > > > > The debian packages coming out of "make *deb-pkg" lack some
> > > > > critical information in the control-files e.g. the "Depends:"
> > > > > field. If one tries to install a fresh system with such a
> > > > > "linux-image" debootstrap or multistrap might try to install
> > > > > the kernel before its deps and the package hooks will fail.    
> > > > 
> > > > I assume you're talking about those hook scripts being run while
> > > > the packages they belong to are only unpacked?  I hadn't thought
> > > > about this issue, but it seems to me that those hook scripts
> > > > generally ought to be fixed to handle this case properly.  Most
> > > > of the packages installing hook scripts for kernel packages are
> > > > not going to be dependencies of linux-image packages, so it will
> > > > never be safe for them to assume their package has been fully
> > > > installed.  
> > > 
> > > Yes these hook scripts fail when installing the kernel on another
> > > system. Indeed we seem to have a case where packages installed on
> > > the build-machine cause install-time deps for the package.  
> > 
> > Can you give an example?  I don't see how that would happen.
> 
> Scripts in /etc/kernel/ will end up as hooks for the kernel-package, if
> you do not set KDEB_HOOKDIR. Looking at an example system that pulls in
> things like "pm-utils, grub-pc .. initramfs". With this mechanism any
> package placing a hook in /etc/kernel can influence the deps.
[...]

That is not a dependency.  That is an extension mechanism.

Ben.

-- 
Ben Hutchings
Lowery's Law:
        If it jams, force it. If it breaks, it needed replacing anyway.


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