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* Allow FPI_PRINT_NBIS to be extended rather than overridden if a user supplies an existing FpPrint template with data; * Prints will only be extended if a device has the required feature. For image-based devices this feature is added by default since they typically do not have storage (this can be overridden at the child class level). Extending an existing FpPrint requires passing a template print with existing data during the enrollment process. This is done because the caller is responsible for maintaining the fingerprint database and doing the necessary deserialization operations if needed. The existing example program is updated to show how to do that.
umockdev Tests
umockdev tests use fingerprint devices mocked by umockdev
toolchain.
This document describes how to create test cases (for USB devices). Many of these tests are tests for image devices, where a single image is captured and stored.
Other kinds of umockdev tests can be created in a similar manner. For
match-on-chip devices you would instead create a test specific custom.py
script, capture it and store the capture to custom.pcapng.
'capture' and 'custom' Test Creation
For image devices the capture.py script will be used to capture one reference
image. If the driver is a non-image driver, then a custom.py script should be
created in advance, which will be run instead.
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Make sure that libfprint is built with support for the device driver that you want to create a test case for.
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From the build directory, run tests/create-driver-test.py as root. Note that if you're capturing data for a driver which already has a test case but the hardware is slightly different, you might want to pass a variant name as a command-line options, for example:
$ sudo tests/create-driver-test.py driver [variant]
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If the capture is not successful, run the tool again to start another capture.
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Add driver test name to
drivers_testsin themeson.build, as instructed, and change the ownership of the just-created test directory in the source. -
Check whether
meson testpasses with this new test.
Note. To avoid submitting a real fingerprint when creating a 'capture' test, the side of finger, arm, or anything else producing an image with the device can be used.
Possible Issues
Other changes may be needed to get everything working. For example the
elan driver relies on a timeout that is not reported correctly. In
this case the driver works around it by interpreting the protocol
error differently in the virtual environment (by means of
FP_DEVICE_EMULATION environment variable).