Re: building custom kernel fails

[Jon Nettleton <jon@solid-run.com>]

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On Thu, Apr 19, 2018 at 12:38 PM Henning Schild <henning.schild@siemens.com>
wrote:

> Am Thu, 19 Apr 2018 09:33:28 +0000
> schrieb Jon Nettleton <jon@solid-run.com>:
>
> > On Thu, Apr 19, 2018 at 11:19 AM Henning Schild
> > <henning.schild@siemens.com> wrote:
> >
> > > Am Thu, 19 Apr 2018 00:32:21 -0700
> > > schrieb <jon@solid-run.com>:
> > >
> > > > I am now building a custom debian package from our kernel sources,
> > > > the kernel compile goes fine.  The deb-pkg is failing because the
> > > > number of files passed to xarg is too long.
> > > >
> > > > Error message is.
> > > >
> > > > 2018-04-19 07:11:17 - INFO     - | Using default distribution of
> > > > 'unstable' in the changelog
> > > > 2018-04-19 07:11:17 - INFO     - | Install lsb-release or set
> > > > $KDEB_CHANGELOG_DIST explicitly
> > > > 2018-04-19 07:11:17 - INFO     - | /usr/bin/xargs: md5sum:
> > > > Argument list too long
> > > > 2018-04-19 07:11:17 - INFO     - | scripts/package/Makefile:90:
> > > > recipe for target 'deb-pkg' failed
> > > > 2018-04-19 07:11:17 - INFO     - | make[1]: *** [deb-pkg] Error
> > > > 126 2018-04-19 07:11:17 - INFO     - | Makefile:1347: recipe for
> > > > target 'deb-pkg' failed
> > > > 2018-04-19 07:11:17 - INFO     - | make: *** [deb-pkg] Error 2
> > > > 2018-04-19 07:11:17 - INFO     - | WARNING: exit code 2 from a
> > > > shell command.
> > > >
> > > > looks like on large kernel builds the file lists will need to be
> > > > broken up.
> > > >
> > >
> > > I have seen that before. It happens in buildchroot when using
> > > qemu-arm-static binfmt magic. Something in that chain seems to cause
> > > problems for very long argument lists.
> > > In my case it was a "make clean" and i removed the files from
> > > outside the buildchroot. But since it now happened again it is
> > > probably something worth looking into.
> > >
> > > Henning
> > >
> >
> > Oh interesting.  I wonder if this has something to do with the binfmt
> > support in CentOS vs Debian.  I will look into it and report back.
>
> I saw it on Gentoo building in a debian docker container. So i guess
> the problem might be related to the binfmt wrapping in general, not
> distro specific.
>
> Henning
>
>
It looks like that was the problem.  I just went through the pain of
building qemu 2.9.1 for Centos7...and all the dependencies that were needed
by it.   That has fixed the custom kernel build issues.  Thanks for all the
pointers.

I would say for now if anyone asks you can consider Centos 7 a no go.  If
there is interest I may add a build to Copr for other users.  Fedora 26 and
newer should be fine.

Jon

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