[Bug 1848399] Re: update-grub fails if zpools with unsupported feature_flags exist

[satmandu]

FYI:

One can replace the "zpool import -f -a -o cachefile=none -N" line with this:
    local pipe="/tmp/zpool_pipe"
    no_import_pools=$(mkfifo ${pipe}; zpool import -f -a -o cachefile=none -N 2> ${pipe} | cut -d \' -f 2 ${pipe}; rm ${pipe})

If one wants a list of the pools which can not be imported.

To just discard the error though and keep update-grub from failing this
works fine too:

local discard_pool_import_err=""
discard_pool_import_err=$(zpool import -f -a -o cachefile=none -N 2>/dev/null || true)

Maybe that workaround could be added so update-grub at least doesn't
fail if a zpool which can't be imported is seen?

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https://bugs.launchpad.net/bugs/1848399

Title:
  update-grub fails if zpools with unsupported feature_flags exist

Status in grub2 package in Ubuntu:
  Incomplete
Status in ubiquity package in Ubuntu:
  Invalid
Status in zsys package in Ubuntu:
  Invalid

Bug description:
  install from Oct 14 live installer failed.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: ubiquity 19.10.20
  ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
  Uname: Linux 5.3.0-18-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu8
  Architecture: amd64
  CasperVersion: 1.425
  Date: Wed Oct 16 20:03:30 2019
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed quiet splash ---
  LiveMediaBuild: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191014)
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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