Re: Add --dereference option to df

[Pádraig Brady]

On 05/15/2013 02:55 PM, Ondrej Oprala wrote:
> Hi, this patch adds the --dereference option to df, so if a symlink is 
> specified
> as an argument to df (possibly /dev/disk/by-uuid/*), df outputs info about the
> filesystem the symlinked file is on instead. Now, I realize the option's name 
> is
> a bit misleading, since the arguments are stat-ed anyway, but IMHO that's 
> exactly
> what it looks like from a user's perspective.

I don't get this sorry.
Well the naming is very confusing since symlinks are already deferenced?

Also I don't see a change for your stated example:

$ df -L /dev/disk/by-uuid/3030-3030
Filesystem     1K-blocks  Used Available Use% Mounted on
udev             1454732     0   1454732   0% /dev

$ df $(realpath /dev/disk/by-uuid/3030-3030)
Filesystem     1K-blocks  Used Available Use% Mounted on
udev             1454732     0   1454732   0% /dev

If I do create a symlink to a different FS,
I'm not sure I get results you're expecting?

$ ln -nsf /dev/shm shm

$ src/df shm
Filesystem     1K-blocks  Used Available Use% Mounted on
tmpfs            1464412  6292   1458120   1% /dev/shm

$ src/df -L shm
Filesystem     1K-blocks  Used Available Use% Mounted on
udev             1464412  6292   1458120   1% /dev

thanks,
Pádraig.