[Bug 1844761] Re: Casper doesn't properly support NFSOPTS

[Ubuntu Foundations Team Bug Bot]

** Tags added: patch

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https://bugs.launchpad.net/bugs/1844761

Title:
  Casper doesn't properly support NFSOPTS

Status in casper package in Ubuntu:
  New

Bug description:
  From https://www.kernel.org/doc/Documentation/filesystems/nfs/nfsroot.txt:
  nfsroot=[<server-ip>:]<root-dir>[,<nfs-options>]

  NFSOPTS are properly supported by initramfs-tools/scripts/nfs:
  if [ "${NFSROOT#*,}" != "${NFSROOT}" ]; then
      NFSOPTS="-o ${NFSROOT#*,}"
  fi

  But casper doesn't support them properly like this.
  Casper assumes that the scripts/nfs code has already ran and set NFSOPTS, which it didn't.
  So the only way to set NFSOPTS with casper is to actually pass NFSOPTS=xxx in the kernel cmdline; the kernel itself then passes this as an init parameter.

  This behavior is wrong and undocumented, NFSOPTS isn't a kernel
  parameter but an internal variable of initramfs-tools/scripts/nfs,
  which isn't set when casper runs, and casper needs to set it by doing
  an "if" like the one above ^.

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