RE: [cip-dev] isar error log

[<daniel.sangorrin@toshiba.co.jp>]

Henning, Ben, Jan: thanks for your answers.

Actually, in my PC (Ubuntu 16.04.6) binfmt_misc is mounted, both outside and inside the container.
# Henning: not sure why yours wasn't but it could be because I have also qemu-user-static installed on the host OS or because of something I installed in the past.

I tried to dig a bit deeper.

- The error:
update-binfmts: warning: unable to close /proc/sys/fs/binfmt_misc/register: Invalid argument
- This error appears when /kas/docker-entrypoint calls "dpkg-configure qemu-user-static"
- I added a set -x to qemu-user-static's postinstall script (/var/lib/dpkg/info/qemu-user-static.postinst) and the error comes from this line:
update-binfmts --package qemu-user-static --install qemu-aarch64 ... --credential yes --fix-binary yes
- I tried to run update-binfmts (with the same arguments) and I could reproduce the problem
- If I remove the "--fix-binary yes" part and execute it twice, then the first time fails with the same error but the second time it succeeds
- I straced update-binfmts with --fix-binary yes
  - it opens /proc/sys/fs/binfmt_misc/register
  - writes :qemu-aarch64:M:0:x7fx45x4cx46x0"
  - returns EINVAL

And then I found the real reason of the problem:
- The qemu-user-static on the host side was conflicting with the one inside docker.
- If I remove qemu-user-static from the host then, it works.

Thanks,
Daniel

> -----Original Message-----
> From: cip-dev-bounces@lists.cip-project.org <cip-dev-bounces@lists.cip-
> project.org> On Behalf Of Ben Hutchings
> Sent: Friday, April 12, 2019 9:00 PM
> To: Henning Schild <henning.schild@siemens.com>; [ext] Jan Kiszka
> <jan.kiszka@siemens.com>
> Cc: kas-devel@googlegroups.com; isar-users@googlegroups.com; cip-
> dev@lists.cip-project.org
> Subject: Re: [cip-dev] isar error log
> 
> On Fri, 2019-04-12 at 13:37 +0200, Henning Schild wrote:
> [...]
> > Just had a look at a ubuntu 16.04. It does support the fs but it is
> > not mounted. So a pseudo-code patch for the docker entry could be:
> >
> > if not mounted
> >  if grep binfmt_misc /proc/filesystems
> >   mount
> >  else
> >   echo "Get a real and recent distro"
> >  fi
> > fi
> 
> Actual code should be something like:
> 
> if ! mountpoint -q /proc/sys/fs/binfmt_misc \
>    && ! mount -t binfmt_misc binfmt_misc /proc/sys/fs/binfmt_misc; then
>     echo >&2 "E: Unable to mount binfmt_misc"
>     exit 1
> fi
> 
> Ben.
> 
> --
> Ben Hutchings, Software Developer                         Codethink Ltd
> https://www.codethink.co.uk/                 Dale House, 35 Dale Street
>                                      Manchester, M1 2HF, United Kingdom
> _______________________________________________
> cip-dev mailing list
> cip-dev@lists.cip-project.org
> https://lists.cip-project.org/mailman/listinfo/cip-dev