[fprint] vfs5011 data storage

[Alex Porras]

Hello,

I am trying out fprint on a Lenovo E460 laptop with a fingerprint reader
that uses the vfs501 driver. Reading through the security notes wiki page,
it looks like some drivers may or may not write fingerprint data to the
hard drive:

https://www.freedesktop.org/wiki/Software/fprint/Security_notes/

I have successfully tested scanning one print, yet despite storage of this
print in fprint-demo, I do not see any files written to /var/lib/fprint.
However, looking at the source code for the driver makes me think it deals
with image data:

https://cgit.freedesktop.org/libfprint/libfprint/tree/libfprint/drivers/vfs5011.c#n150

(That being said, I'm not super proficient in C, so maybe I'm misreading
this.)

Is there perhaps a better way to determine/confirm how this driver handles
the capture/verification of the fingerprint?

Thanks,

Alex
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