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[Marc Tamsky <mtamsky@xxxxxxxxx>]

Probably caused by the thoughtless changes that have been upstreamed in
https://bugs.launchpad.net/ubuntu/+source/coreutils/+bug/1432871

How could the difference between:

vagrant@vagrant-ubuntu-trusty-64:~$ df /
Filesystem                                             1K-blocks    Used Available Use% Mounted on
/dev/disk/by-uuid/3af531bb-7c15-4e60-b23f-4853c47ccc91  41251136 1356000  38159224   4% /

and

vagrant@vagrant-ubuntu-trusty-64:~$ df | grep /$
/dev/sda1       41251136   1356000  38159224   4% /

not be a bug?

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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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