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

[John Paul Adrian Glaubitz]

On 7/9/19 4:01 PM, Laurent Vivier wrote:
> What is the content of:
> 
> /etc/binfmt.d/qemu-m68k.conf
> /proc/sys/fs/binfmt_misc/qemu-m68k

root@nofan:~> cat /etc/binfmt.d/qemu-m68k.conf
:qemu-m68k:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x04:\xff\xff\xff\xff\xff\xff\xfe\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/bin/qemu-m68k-static:P
root@nofan:~> cat /proc/sys/fs/binfmt_misc/qemu-m68k
enabled
interpreter /usr/bin/qemu-m68k-static
flags: OCF
offset 0
magic 7f454c4601020100000000000000000000020004
mask ffffffffffffff00fffffffffffffffffffeffff
root@nofan:~>

> what is the result of "file sid-m68k-sbuild/usr/bin/qemu-m68k-static"?
> 
> Bonus: if you don't want to copy qemu-m68k-static into the chroot, you
> can use "--persistent" with qemu-binfmt-conf.sh.
I'm doing that and I don't have a copy of qemu in the chroot.

But I think I forgot to pass --persistent to the script while testing.

Adrian

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`. `'   Freie Universitaet Berlin - address@hidden
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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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