[Bug 1535349] [NEW] `df /dev/sda1` no longer reports information for /dev/sda1

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You have been subscribed to a public bug by Ubuntu Foundations Team Bug Bot (crichton):

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.

** Affects: coreutils (Ubuntu)
     Importance: Medium
     Assignee: Dave Chiluk (chiluk)
         Status: Confirmed

** Affects: coreutils (Ubuntu Trusty)
     Importance: Medium
     Assignee: Dave Chiluk (chiluk)
         Status: Confirmed


** Tags: patch regression-update sts
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`df /dev/sda1` no longer reports information for /dev/sda1
https://bugs.launchpad.net/bugs/1535349
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