bug#64588: BUG: stat -f incorrectly reports a BTRFS device as a tmpfs

[Pádraig Brady]

On 13/07/2023 11:33, support wrote:
> Hmmm ok,
>
> Well the reason I flagged it as a bug, is because the btrfsmaintenance
> package uses a script to test to see if a filesystem is btrfs and
> incorrectly uses stat -f to do it. This must have worked in the past
> else they would not use it.
>
> The code snippet is:
>
>
> # function: is_btrfs
> # parameter: path to a mounted filesystem
> #
> # check if filesystem is a btrfs
> is_btrfs() {
>       local FS=$(stat -f --format=%T "$1")
>       [ "$FS" = "btrfs" ] && return 0
>       return 1
> }
>
>
> Obviously that is targeted at mounted filesystems, but the documentation
> and usage always shows "<path>|<device>" as a parameter.
>
> I guess I should file a bug against that package but I am curious as to
> when the default behaviour changed.

It has never changed AFAIK

thanks,
Pádraig