Comment 0 for bug 1535349

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.