Clear fingerprint reader (Goodix, etc) fingerprints on Linux via direct libfprint calls.

fprint-clear.c

// gcc `pkg-config --cflags --libs libfprint-2` -o fprint-clear fprint-clear.c
// compile, stop fprintd, run as root, start fprintd

#include <stdio.h>
#include <fprint.h>

int main() {
	FpContext *ctx = fp_context_new ();
	printf("Got context\n");
	GPtrArray *devices = fp_context_get_devices (ctx);
	printf("Got devices\n");
	if (devices->len != 1) {
		return 1;
	}

	FpDevice *dev = g_object_ref (g_ptr_array_index (devices, 0));
	printf("Opening device 0\n");
	if (!fp_device_open_sync(dev, NULL, NULL)) {
		return 1;
	}

	g_autoptr(GError) clear_err = NULL;
	printf("Clearing device 0\n");
	if (!fp_device_clear_storage_sync(dev, NULL, &clear_err)) {
		printf("Failed to clear storage before first enrollment: %s\n", clear_err->message);
	}
	printf("Done\n");
}