[Bug 1860914] Re: QEMU prepends pathnames to command lines of Multiboot kernels and modules, contrary to the specification

[felix]

** Patch added: "cmdline.patch"
   
https://bugs.launchpad.net/qemu/+bug/1860914/+attachment/5383658/+files/cmdline.patch

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https://bugs.launchpad.net/bugs/1860914

Title:
  QEMU prepends pathnames to command lines of Multiboot kernels and
  modules, contrary to the specification

Status in QEMU:
  New

Bug description:
  When QEMU is launched with the -kernel option to boot a Multiboot
  image, the command line passed in the -append option is additionally
  prefixed the pathname of the kernel image and a space. Likewise,
  module command lines passed in the -initrd option are passed with the
  module pathname and a space prepended. At the very least the former is
  contary to what is prescribed in the Multiboot specification, version
  0.6.96[0], which says in §3.3:

  > General-purpose boot loaders should allow user a complete control on
  command line independently of other factors like image name.

  With respect to module command lines, the spec is less clear, but GNU
  GRUB2 (the de facto reference implementation) does not prepend
  pathnames to command lines of either. I haven't tested GRUB legacy,
  but I assume it exhibits the same behaviour. It would be strange if
  passing pathnames was in fact intended; bootloader pathnames are
  useless to the loaded kernel, which may potentially have a completely
  different view of the file system from the bootloader.

  Also, given that a kernel pathname may contain spaces, skipping it in
  the command line cannot be done reliably, while loading a Multiboot
  module from a pathname that contains spaces is outright impossible.

  Found in 4.2.0, but latest git master apparently behaves the same.

  [0]: https://www.gnu.org/software/grub/manual/multiboot/multiboot.html

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