78 lines
2.7 KiB
Markdown
78 lines
2.7 KiB
Markdown
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# Virtual Face HAL
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This is a virtual HAL implementation that is backed by system properties
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instead of actual hardware. It's intended for testing and UI development
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on debuggable builds to allow devices to masquerade as alternative device
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types and for emulators.
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## Device Selection
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You can either run the FakeFaceEngine on a [real device](#actual-device) or a [virtual device/cuttlefish](#getting-started-on-a-virtual-device-cuttlefish). This document should
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help you to get started on either one.
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After setting up a device, go ahead and try out [enrolling](#enrolling) & [authenticating](#authenticating)
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### Getting started on a Virtual Device (cuttlefish)
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Note, I'm running this via a cloudtop virtual device.
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1. Setup cuttlefish on cloudtop, See [this](https://g3doc.corp.google.com/company/teams/android/teampages/acloud/getting_started.md?cl=head) for more details.
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2. acloud create --local-image
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3. Enter in the shell command to disable hidl
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```shell
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$ adb root
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$ adb shell settings put secure com.android.server.biometrics.AuthService.hidlDisabled 1
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$ adb reboot
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```
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4. You should now be able to do fake enrollments and authentications (as seen down below)
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### Actual Device
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1. Modify your real devices make file (I.E. vendor/google/products/{YOUR_DEVICE}.mk)
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2. Ensure that there is no other face HAL that is being included by the device
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3. Add the following
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```
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PRODUCT_COPY_FILES += \
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frameworks/native/data/etc/android.hardware.biometrics.face.xml:$(TARGET_COPY_OUT_PRODUCT)/etc/permissions/android.hardware.biometrics.face.xml
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PRODUCT_PACKAGES += \
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android.hardware.biometrics.face-service.example \
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```
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4. Now build and flash m -j120 && flash
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5. Run the following commands
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```shell
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# This is a temporary workaround
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$ adb root
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$ adb shell setprop persist.vendor.face.virtual.type RGB
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$ adb shell setprop persist.vendor.face.virtual.strength strong
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$ adb shell locksettings set-pin 0000
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$ adb reboot
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```
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## Enrolling
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```shell
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# authenticar_id,bucket_id:duration:(true|false)....
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$ adb shell setprop vendor.face.virtual.next_enrollment 1,0:500:true,5:250:true,10:150:true,15:500:true
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$ adb shell am start -n com.android.settings/.biometrics.face.FaceEnrollIntroduction
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# If you would like to get rid of the enrollment, run the follwoing command
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$ adb shell setprop persist.vendor.face.virtual.enrollments \"\"
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```
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## Authenticating
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```shell
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# If enrollment hasn't been setup
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$ adb shell setprop persist.vendor.face.virtual.enrollments 1
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$ adb shell cmd face sync
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# After enrollment has been setup
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$ adb shell setprop vendor.face.virtual.operation_authenticate_duration 800
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$ adb shell setprop vendor.face.virtual.enrollment_hit 1
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# Power button press to simulate auth
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$ adb shell input keyevent 26
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```
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