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[Marc Tamsky <mtamsky@xxxxxxxxx>]

I'd like to take back my earlier comment.

It all starts in https://bugs.debian.org/cgi-
bin/bugreport.cgi?bug=653073

In 14.04.3, the final straw for me is the transition from coreutils
8.21-1ubuntu5.2 to coreutils 8.21-1ubuntu5.3.

In my case, there is an enabling requirement:  grub must pass root=UUID
=<uuid-string> to the kernel at boot time.

I can restore the "correct" output from `df /` if I first uncomment
GRUB_DISABLE_LINUX_UUID=true in `/etc/default/grub`, followed by running
`update-grub`, and reboot.  This type of change may not work for
everyone, as some folks may be relying on UUIDs for consistent volume
identification.  Ymmv.

It would be nice if `df /` could run `readlink -f` on the filesystem in
column one, perhaps as a flag or ENV variable, but that's a separate
story.


** Bug watch added: Debian Bug tracker #653073
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=653073

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https://bugs.launchpad.net/bugs/1527416

Title:
  Unexpected change in "df /"output

Status in coreutils package in Ubuntu:
  Confirmed

Bug description:
  An unexpected change in the output of "df /" has happened in either
  coreutils 8.21-1ubuntu5.3 or 8.21-1ubuntu5.2.

  After doing updates on a number of servers today, the output of "df /"
  has changed. It now shows the full device path, including uuid of the
  device, instead of just the "generic" device.

  For example, on an updated server with coreutils 8.21-1ubuntu5.3:
  # df /
  Filesystem                                             1K-blocks    Used Available Use% Mounted on
  /dev/disk/by-uuid/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx   8115168 3542936   4136956  47% /

  On a server with coreutils 8.21-1ubuntu5.1:
  # df /
  Filesystem     1K-blocks    Used Available Use% Mounted on
  /dev/xvda1       8115168 4260144   3419748  56% /

  This makes scripts or other processes (monitoring scripts to report
  available disk space, for example) that rely on a standard filesystem
  name across numerous servers break, as each server will have a
  different disk UUID.

  Oddly, attached volumes (non-root volumes) don't exhibit the behaviour, and continue to show the "generic" device:
  # df /media/ebs1
  Filesystem     1K-blocks  Used Available Use% Mounted on
  /dev/xvdf      104806400 43260 104763140   1% /media/ebs1

  # lsb_release -rd
  Description:	Ubuntu 14.04.3 LTS
  Release:	14.04

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