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[Ubuntu Foundations Team Bug Bot <1535349@xxxxxxxxxxxxxxxxxx>]

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** Tags added: patch

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https://bugs.launchpad.net/bugs/1535349

Title:
  `df /dev/sda1` no longer reports information for /dev/sda1

Status in coreutils package in Ubuntu:
  Confirmed
Status in coreutils source package in Trusty:
  Confirmed

Bug description:
  It appears that the latest version of coreutils uploaded to trusty-
  updates has a regression in it.  We have scripting that checks how
  much space we have left on a partition using `df /dev/sda1`. Using
  coreutils 8.21-1ubuntu5.1, we can do the following:

  $ df -h /dev/sda1
  Filesystem      Size  Used Avail Use% Mounted on
  /dev/sda1       9.9G  978M  8.5G  11% /

  This is a valid way of using the tool per the manpage: "If  an
  argument is the absolute file name of a disk device node containing a
  mounted file system, df shows the space available on that file system
  rather than on the file system containing the device node"

  It appears that either 8.21-1ubuntu5.2 or 8.21-1ubuntu5.3 broke this,
  however. We now get output for the udev filesystem that is mounted at
  /dev, instead of the device we pass in.

  $ df -h /dev/sda1 
  Filesystem      Size  Used Avail Use% Mounted on
  udev            1.8G  8.0K  1.8G   1% /dev

  This is both a behaviour change, and contravenes the manpage, so it
  would be good to get this fixed.

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