Re: globus-net-manager FTBFS during python 3.10 transition

[Laurent Vivier <laurent@vivier.eu>]

Le 26/04/2022 à 21:24, John Paul Adrian Glaubitz a écrit :
> Hi!
...
> > [2] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=974004
Normally, since qemu v6.0.0 you can preserve argv[0]:

commit 6e1c0d7b951e19c53b8467e8bc4b71ee73a394ea
Author: Laurent Vivier <laurent@vivier.eu>
Date:   Mon Feb 22 11:50:04 2021 +0100

    linux-user: manage binfmt-misc preserve-arg[0] flag

    Add --preserve-argv0 in qemu-binfmt-conf.sh to configure the preserve-argv0
    flag.

    This patch allows to use new flag in AT_FLAGS to detect if
    preserve-argv0 is configured for this interpreter:
    argv[0] (the full pathname provided by binfmt-misc) is removed and
    replaced by argv[1] (the original argv[0] provided by binfmt-misc when
    'P'/preserve-arg[0] is set)

    For instance with this patch and kernel support for AT_FLAGS:

      $ sudo chroot m68k-chroot sh -c 'echo $0'
      sh

    without this patch:

      $ sudo chroot m68k-chroot sh -c 'echo $0'
      /usr/bin/sh

    The new flag is available in kernel (v5.12) since:
    2347961b11d4 ("binfmt_misc: pass binfmt_misc flags to the interpreter")

    This can be tested with something like:

      # cp ..../qemu-ppc /chroot/powerpc/jessie

      # qemu-binfmt-conf.sh --qemu-path / --systemd ppc --credential yes \
                            --persistent no --preserve-argv0 yes
      # systemctl restart systemd-binfmt.service
      # cat /proc/sys/fs/binfmt_misc/qemu-ppc
      enabled
      interpreter //qemu-ppc
      flags: POC
      offset 0
      magic 7f454c4601020100000000000000000000020014
      mask ffffffffffffff00fffffffffffffffffffeffff
      # chroot /chroot/powerpc/jessie  sh -c 'echo $0'
      sh

      # qemu-binfmt-conf.sh --qemu-path / --systemd ppc --credential yes \
                            --persistent no --preserve-argv0 no
      # systemctl restart systemd-binfmt.service
      # cat /proc/sys/fs/binfmt_misc/qemu-ppc
      enabled
      interpreter //qemu-ppc
      flags: OC
      offset 0
      magic 7f454c4601020100000000000000000000020014
      mask ffffffffffffff00fffffffffffffffffffeffff
      # chroot /chroot/powerpc/jessie  sh -c 'echo $0'
      /bin/sh

    Signed-off-by: Laurent Vivier <laurent@vivier.eu>
    Message-Id: <20210222105004.1642234-1-laurent@vivier.eu>

You need also kernel v5.12:

commit 2347961b11d4079deace3c81dceed460c08a8fc1
Author: Laurent Vivier <laurent@vivier.eu>
Date:   Tue Jan 28 14:25:39 2020 +0100

    binfmt_misc: pass binfmt_misc flags to the interpreter

    It can be useful to the interpreter to know which flags are in use.

    For instance, knowing if the preserve-argv[0] is in use would
    allow to skip the pathname argument.

    This patch uses an unused auxiliary vector, AT_FLAGS, to add a
    flag to inform interpreter if the preserve-argv[0] is enabled.

    Note by Helge Deller:
    The real-world user of this patch is qemu-user, which needs to know
    if it has to preserve the argv[0]. See Debian bug #970460.

    Signed-off-by: Laurent Vivier <laurent@vivier.eu>
    Reviewed-by: YunQiang Su <ysu@wavecomp.com>
    URL: http://bugs.debian.org/970460
    Signed-off-by: Helge Deller <deller@gmx.de>

Thanks,
Laurent