Some devices have storage but that's is limited enough not to be able
to store all the metadata, but just a fingerprint id.
In such case we also need to use the local storage to be able to verify.
Fprintd does this already, but we don't do it in the libfprint examples.
So, in in case we enroll, always save the print information to the disk,
while in case we verify we try to load the print from disk and we use
that in case its private data matches the one provided by the device.
While the image device has its own finger status tracking, we use a simpler
version as public data information, so let's just report the finger-on/off
and when a finger is expected to the parent class.
Verify that this happens as expected using the virtual-image class
It is not very useful to just delete the data again after a failure, as
it might be useful for debugging. Just store it into an "errors"
subdirectory of the PWD in the hope that this is a sane location.
Note that it'll error out if the directory already exists, but that
should be acceptable in all cases. i.e. it won't exist in the CI and
developers can just wipe the directory.
When porting the driver to the new libfprint 1.90.0 a mistake was made
where the device was not passed through user_data anymore but it was
still read from there. Stop using user_data in the callback to fix this.
See: #320
The elan driver always "deactivates" the device after a cpature run. We
can simplify the while internal state into a single "active" state and
rely on the image device driving this state machine correctly.
i.e.:
* We start a callibrate/capture/deactivate when we go into the
AWAIT_FINGER_ON state
* We only store the fact that we are active and want to deactivate
* We rely on the image device never going into the AWAIT_FINGER_ON
state without first waiting for the finger to be off (which implies
deactivation).
This adds a number of new internal states to better capture what is
going on. Also added are checks that all transitions we make are in the
set of expected and valid transitions.
Only three drivers use the state_change notification. These drivers are
updated accordingly.
The boolean is just used to emit a warning for unexpected state
transitions. It is sufficient to pass it to the deactivate function
directly for that purpose.
We might redo image transfers, but we only ever had one reference that
was implicitly removed after the transfer completed. Add a new reference
each time it is submitted and only free the last reference in the stop
handler.
For some reason we re-submitted the interrupt transfer with a timeout of
1s while the original submission was without a timeout. This looks like
typo, remove the timeout.
Annotate the USB transfer creation functions with the correct buffer
access attribute. Note that we only annotate them as read_only as the
functions may be used for sending and receiving.
Hopefully this will catch buffer overflows in drivers in the future.
Doing this avoids race conditions in testing code where the code might
try to submit errors/images before the device has been activated. This
would then (sometimes) trigger assertions in the image driver code.
The earlier image device code tried to hide deactivation from the
surrounding library. However, this does not make any sense anymore with
the early reporting feature present.
This changes the operation to complete only once the device is
deactivated. Also changed that in most cases (except for cancellation)
we wait for the finger to be removed before deactivating the device.
The driver seems to have relied on the device to be fully
deactivated and activated again for each capture. This is not the case
during enroll, and as such in can cause issues.
Try fixing this by splitting out the last few commands send to the
device and assuming that this starts the capture.
Fixes: #306
We have plenty of code paths where a transfer may be cancelled before it
is submitted. Unfortunately, libgusb up to and including version 0.3.6
are not handling that case correctly (due to libusb ignoring
cancellation on transfers that are not yet submitted).
Work around this, but do so in a somewhat lazy fashion that is not
entirely race free.
Closes: #306
Delay the open/close callbacks by 100ms so that we have a window of
opportunity for race conditions. This is needed to test certain
conditiosn in fprintd.
Adding a trailing \n to g_message, g_debug, g_warning and g_error is not
neccessary, as a newline will be added automatically by the logging
infrastructure.
The cancellable needs to be free'ed at deactivation. Also free it if we
run into a fatal error, which then in turn indicates that the device is
deactivated already.
The change_state function is called synchronously from the
image_captured callback. This means that deactivation of the device
happens during the img_cb function, causing the USB transfer to be
re-registered even though the device is already deactivating.
There are various ways to fix this, but it makes sense to directly bind
the cancellation to the deactivation. So create a cancellable that we
cancel at deactivation time, and make sure we always deactivate by going
through cancellation.
closes: #306
Image devices are simply deactivated suddenly. As such, the cancellation
logic of FpDevice is not really useful there, but the documentation was
apparently accidentally copied unmodified.
This is unlikely to happen in a real world scenario and currently breaks
running the CI test (not the umockdev based ones) while building the
flatpak. Lower the severity to avoid aborting because there is a
warning.
Image devices may return a FP_DEVICE_ERROR_NOT_SUPPORTED error once capture
is already started, in such case handle the error going in non imaging mode
