feat(key): make `UnlockPolicy::Fail` more useful

We already can check if an fs is encrypted with `bcachefs unlock -c`.
With this option we can now instead check if we have a key but not
actually mount by not specifying a mount point. e.g.

```sh
if bcachefs mount -k fail "$blkdev"`; then
    echo "device is unlocked!"
fi
```

Not sure what the original intent for this was. For scenarios where
encryption is simply not supported on principle?

Signed-off-by: Thomas Mühlbacher <tmuehlbacher@posteo.net>

0 files changed, 0 insertions, 0 deletions