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

[John Paul Adrian Glaubitz]

After building qemu-m68k, I did:

root@nofan:~/qemu> scripts/qemu-binfmt-conf.sh --systemd m68k 
--qemu-path=/usr/bin --qemu-suffix=-static --preserve-arg0 yes --persistent yes
Setting /usr/bin/qemu-m68k-static as binfmt interpreter for m68k for 
systemd-binfmt.service
root@nofan:~/qemu> rm /usr/bin/qemu-m68k-static
root@nofan:~/qemu> cp -av m68k-linux-user/qemu-m68k /usr/bin/qemu-m68k-static 
'm68k-linux-user/qemu-m68k' -> '/usr/bin/qemu-m68k-static'
root@nofan:~/qemu> systemctl restart binfmt-support.service 
root@nofan:~/qemu> chroot /local_scratch/sid-m68k-sbuild/
(sid-m68k-sbuild)root@nofan:/# sh -c 'echo $0'
/bin/sh
(sid-m68k-sbuild)root@nofan:/#

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - address@hidden
`. `'   Freie Universitaet Berlin - address@hidden
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913

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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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