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device: Handle full device storage including garbage collection

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The new libfprint version has support for devices that store data on the
sensor. In that case, the on-sensor storage might fill up when the user
tries to enroll a new print.

The strategy introduced here to handle this is to try and delete prints
from the device that we do not know about (assuming, it is e.g. from an
old installation and unusable).

It can also happen that we are not able to garbage collect old prints.
If that happens, a new error code "enroll-data-full" will be returned
signalling the situation to the enrolling application.
This commit is contained in:
Benjamin Berg
2019-07-31 16:00:39 +02:00
parent ca482036c7
commit 9c8d062669
2 changed files with 106 additions and 0 deletions
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10
src/device.xml
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@ -245,6 +245,16 @@
The user should remove their finger from the reader and retry scanning their finger, the enrollment is still ongoing.
</doc:definition>
</doc:item>
<doc:item>
<doc:term>enroll-data-full</doc:term>
<doc:definition>
No further prints can be enrolled on this device, <doc:ref type="method" to="Device.EnrollStop">Device.EnrollStop</doc:ref> should now be called.
<doc:ref type="method" to="DeleteEnrolledFingers">Delete other prints</doc:ref> from the device first to continue
(e.g. from other users). Note that old prints or prints from other operating systems may be deleted automatically
to resolve this error without any notification.
</doc:definition>
</doc:item>
<doc:item>
<doc:term>enroll-disconnected</doc:term>
<doc:definition>