[Toybox] reason for realpath in df?

[Rob Landley]

On 09/06/2015 12:12 PM, enh wrote:
> one of the obvious remaining differences between toybox df and
> coreutils (or Android) df is that it follows symbolic links in the
> first column. the git history doesn't explain why this change was
> made, though it was clearly deliberate. can you remember why?
> 
> 
> commit e9806f0828a39a6105d24fceb0f230c4bcbbad93
> Author: Rob Landley <rob at landley.net>
> Date:   Fri Oct 26 21:15:31 2012 -0500
> 
>     Follow symlinks to get actual device name, getmountlist() reverses
> order for us now, detect stdout to full device.

I don't, but my blog does:

http://landley.net/notes-2012.html#26-10-2012

I.E. Ubuntu put dev-by-uuid symlinks into fstab so you have to resolve
them to get the actual device name:

$ cat /proc/mounts
rootfs / rootfs rw 0 0
...
/dev/disk/by-uuid/22bb0769-62f9-4d21-bd09-b48afa35f9f2 / ext4
rw,relatime,errors=remount-ro,data=ordered 0 0
...
$ df | head -n 2
Filesystem     1K-blocks      Used Available Use% Mounted on
/dev/sda1      541264712 309100100 204646868  61% /


(Seriously, this is why I blog. Fallen out of the habit a bit lately, I
should get back into it...)

Rob