[Bug 1687664] Re: grub-probe zfs bug: failed to get canonical path

[Jens Elkner]

FWIW: Found another case, where grub2 fails:

May  3 15:37:28 in-target: grub-common is already the newest version (2.02~beta2-36ubuntu3.9).
May  3 15:37:28 in-target: 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
May  3 15:37:28 main-menu[422]: (process:4764): grub-probe: error: failed to get canonical path of `rpool/ROOT/linux'.
May  3 15:37:28 main-menu[422]: (process:4764): grub-probe: error: failed to get canonical path of `rpool/ROOT/linux'.
May  3 15:37:28 main-menu[422]: WARNING **: Configuring 'grub-installer' failed with error code 1
May  3 15:37:28 main-menu[422]: WARNING **: Menu item 'grub-installer' failed.
May  3 15:37:40 main-menu[422]: INFO: Falling back to the package description for brltty-udeb
^C

~ # zfs list 
NAME                    USED  AVAIL  REFER  MOUNTPOINT
rpool                   163G   760G    19K  none
rpool/ROOT             2.55G   760G    19K  none
rpool/ROOT/linux       2.55G   760G  1.61G  /target
rpool/ROOT/linux/home    19K   760G    19K  legacy
rpool/ROOT/linux/var    963M   760G   963M  legacy
rpool/VARSHARE           19K   760G    19K  /target/var/share
rpool/dump             64.0G   824G     8K  -
rpool/swap             96.0G   856G     8K  -

~ # zpool status
  pool: rpool
 state: ONLINE
  scan: none requested
config:

	NAME         STATE     READ WRITE CKSUM
	rpool        ONLINE       0     0     0
	  nvme0n1p2  ONLINE       0     0     0

~ # zpool status -P
  pool: rpool
 state: ONLINE
  scan: none requested
config:

	NAME              STATE     READ WRITE CKSUM
	rpool             ONLINE       0     0     0
	  /dev/nvme0n1p2  ONLINE       0     0     0

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https://bugs.launchpad.net/bugs/1687664

Title:
  grub-probe zfs bug: failed to get canonical path

Status in grub2 package in Ubuntu:
  New

Bug description:
  grub-probe /

  fails with grub-probe: error: failed to get canonical path of
  `/dev/HDD0p2'. This is simply because grub makes the wrong assumption,
  that "zpool status $pool" lists the vdevs in use only with the '/dev/'
  prefix stripped off. It probably assumes something like /dev/sda etc.,
  which is discouraged to use.

  Instead, grub should use "zpool status -P $pool" to get the full
  device path. This would probably result into a symlink, e.g. /dev
  /disk-by-id/$bla . If this is not sufficient, grub should use
  realpath() to get the final blockdev entry like /dev/sda1 .

  The current setup I use is:

  433 0 drwxr-xr-x 4 root root 80 Apr 28 20:22 /dev/chassis/SYS
  434 0 drwxr-xr-x 2 root root 200 Apr 28 23:06 /dev/chassis/SYS/HDD0
  435 0 lrwxrwxrwx 1 root root 12 Apr 28 23:16 /dev/chassis/SYS/HDD0/HDD0 -> ../../../sda
  417 0 lrwxrwxrwx 1 root root 13 Apr 28 23:16 /dev/chassis/SYS/HDD0/HDD0p1 -> ../../../sda1
  442 0 lrwxrwxrwx 1 root root 13 Apr 28 23:16 /dev/chassis/SYS/HDD0/HDD0p2 -> ../../../sda2
  423 0 lrwxrwxrwx 1 root root 13 Apr 28 23:16 /dev/chassis/SYS/HDD0/HDD0p9 -> ../../../sda9
  436 0 lrwxrwxrwx 1 root root 12 Apr 28 23:16 /dev/chassis/SYS/HDD0/disk -> ../../../sda
  418 0 lrwxrwxrwx 1 root root 13 Apr 28 23:16 /dev/chassis/SYS/HDD0/p1 -> ../../../sda1
  443 0 lrwxrwxrwx 1 root root 13 Apr 28 23:16 /dev/chassis/SYS/HDD0/p2 -> ../../../sda2
  424 0 lrwxrwxrwx 1 root root 13 Apr 28 23:16 /dev/chassis/SYS/HDD0/p9 -> ../../../sda9
  437 0 drwxr-xr-x 2 root root 80 Apr 28 20:22 /dev/chassis/SYS/HDD1
  438 0 lrwxrwxrwx 1 root root 12 Apr 28 23:16 /dev/chassis/SYS/HDD1/HDD1 -> ../../../sdb
  439 0 lrwxrwxrwx 1 root root 12 Apr 28 23:16 /dev/chassis/SYS/HDD1/disk -> ../../../sdb

  with 'zpool create ... rpool /dev/chassis/SYS/HDD0/HDD0p2'

  PS: The full version is 2.02~beta2-36ubuntu3.9 and ZoL
  0.6.5.6-0ubuntu15 (Ubuntu xenial 16.04).

  For simulation one may setup a VirtualBox VM, with Storage == Controller SAS (Type: LsiLogic SAS, Port Count: 8), and e.g. one VDI attached to it (/dev/sda) and e.g. netboot an install image. When it comes to the 'partitioning disks' dialog, start a shell and fetch/install ksh93 (i.e. ksh-udeb).
  Than the script http://iks.cs.ovgu.de/~elkner/tmp/ubuntu/bayLinks.sh can be used, to create the required dev symlinks (e.g. bayLinks.sh -mru). For convenience http://iks.cs.ovgu.de/~elkner/tmp/ubuntu/ubuntu-part.sh can be used to create the script for [re-]partitioning the drive[s] and setup zfs related stuff (whereby the 'zpool create' and consecutive stuff will fail because of the bug). E.g. /tmp/ubuntu-part.sh /dev/chassis/SYS/HDD0/HDD0 .

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