Re: [Qemu-devel] [Bug 1835839] Re: qemu-user: $0 incorrectly always reports absolute path

[John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>]

On 7/9/19 1:54 PM, Laurent Vivier wrote:
> ** Patch added: "Enable binfmt-misc preserve-arg[0] flag"
>    https://bugs.launchpad.net/qemu/+bug/1835839/+attachment/5275869/+files/0001-linux-user-manage-binfmt-misc-preserve-arg-0-flags.patch

Thanks! I just tried the patch and ran the setup script with:

./scripts/qemu-binfmt-conf.sh --debian --qemu-path=/usr/bin --qemu-
suffix=-static --preserve-arg0 yes

and:

root@nofan:~/qemu> systemctl restart binfmt-support.service 
root@nofan:~/qemu>

But still don't get the correct path:

(sid-m68k-sbuild)root@nofan:/# sh -c 'echo $0'
/bin/sh
(sid-m68k-sbuild)root@nofan:/#

Do I need to do anything else?

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@debian.org
`. `'   Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de
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https://bugs.launchpad.net/bugs/1835839

Title:
  qemu-user: $0 incorrectly always reports absolute path

Status in QEMU:
  New

Bug description:
  We just ran into an issue with the Perl package on Debian/m68k when
  being built with qemu-user [1].

  The problem can be boiled down to qemu-user always reporting absolute
  paths for the shell variable $0 no matter on how the command was
  invoked.

  A simple reproducer is this:

  On normal system (no emulation):

  root@nofan:~> sh -c 'echo $0'
  sh
  root@nofan:~>

  On qemu-user:

  (sid-m68k-sbuild)root@nofan:/# sh -c 'echo $0'
  /bin/sh
  (sid-m68k-sbuild)root@nofan:/#

  > [1] https://lists.debian.org/debian-68k/2019/07/msg00007.html

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