Brillo / Weave Internals

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1 Brillo / Weave Internals Embedded Linux Conference Europe 2016 Karim karim.yaghmour@opersys.com 1

These slides are made available to you under a Creative Commons ShareAlike 3.0 license. The full terms of this license are here: https://creativecommons.org/licenses/by-sa/3.

2 These slides are made available to you under a Creative Commons ShareAlike 3.0 license. The full terms of this license are here: Delivered and/or customized by Attribution requirements and misc., PLEASE READ: This slide must remain as-is in this specific location (slide #2), everything else you are free to change; including the logo :-) Use of figures in other documents must feature the below Originals at URL immediately under that figure and the below copyright notice where appropriate. You are free to fill in the Delivered and/or customized by space on the right as you see fit. You are FORBIDEN from using the default About slide as-is or any of its contents. You are FORBIDEN from using any content provided by 3rd parties without the EXPLICIT consent from those parties. (C) Copyright 2016, Opersys inc. These slides created by: Karim Yaghmour Originals at: 2

3 About Author of: Introduced Linux Trace Toolkit in 1999 Originated Adeos and relayfs (kernel/relay.c) Training, Custom Dev, Consulting,... 3

4 Agenda 1. A bit of history 2. Architecture 3. Source layout 4. Images 5. User-space 6. Services / Daemons 7. Weave 8. Example 9. Summing up 4

5 1. A bit of history Embedded Linux Android Headless Android Brillo 5

6 1.1. Embedded Linux A set of ad-hoc methods to package the Linux kernel with a (minimal) filesystem. FS content to be determined case-by-case APIs are specific to each device/build Core software : BusyBox U-Boot GNU Toolchain Your flavor of: glibc or uclibc or eglibc yocto or buildroot or eldk or ltib or ptxdist or... No serious UX framework 6

7 1.2. Android... apart from its ubiquitous UX... Fully-integrated IDE: Android Studio SDK/NDK ADB Fastboot Published, well-known, and very rich APIs A large and growing developer community And still we can use embedded Linux components: GNU toolchain, BusyBox, u- boot, glibc,... An actual standardized dev. env. across all product lines 7

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9 1.3. Headless Android + = 9

10 1.4. Brillo / Weave Google platform for IoT* Based on Android Announced at Google I/O 2015 Still not officially released Still under active development Need to sign up for developer preview on Sources available from android.googlesource.com Note: This talk based on sources This talk NOT based on developer preview or any information thereof :P * New, hip way of talking about Embedded Systems, something that's been around for ~50+ years. 10

11 2. Architecture Embedded Linux Android Binder System services HAL DBus Brillo Weave 11

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16 /frameworks/base/core/... AOSP-provided ASL /frameworks/base/services/java/... /frameworks/base/services/jni/ /hardware/libhardware/ Manuf.-provided Manuf. license Manuf.-provided GPL-license /device/[manuf.]/[device] /sdk/emulator/ Kernel or module 16

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20 3. Source layout Getting the sources Brillo top level Removed from Android top level Gone from external/ New to external 20

21 3.1. Getting the sources Same project repo as Android: android.googlesource.com Different manifest file Using repo : $ repo init u $ repo sync 21

22 3.2. Brillo top level bionic bootable build device external frameworks hardware libnativehelper prebuilts product system tools C library replacement Reference bootloader Build system Device-specific files and components Copy of external projects used by AOSP Native system services and libraries Hardware support libs JNI helpers Prebuilt binaries Products running on Brillo Embedded Linux core Brillo Development Kit 22

23 3.3. Removed from Android top level art cts dalvik dvelopers development docs frameworks/base and more libcore ndk packages pdk sdk system/vold and more tools/external 23

24 3.4. Gone from external/ 24

25 3.5. New to external/ bvb chromite gentoo libdivsufsort lzop Brillo Verified Boot Tools to build Chrome OS lightweight suffix array construction algorithm library LZO compression tool 25

26 4. Images AOSP x86 32-bit: 5.1M out/target/product/generic_x86/cache.img 1.3M out/target/product/generic_x86/ramdisk.img 1.3G out/target/product/generic_x86/system.img 12M out/target/product/generic_x86/userdata.img 551M out/target/product/generic_x86/userdata-qemu.img Brillo x86 64-bit: 6.2M out/target/product/brilloemulator_x86_64/boot.img 36K out/target/product/brilloemulator_x86_64/partition-table.img 158M out/target/product/brilloemulator_x86_64/system.img 201M out/target/product/brilloemulator_x86_64/userdata.img 551M out/target/product/brilloemulator_x86_64/userdata-qemu.img 26

27 5. User Space 27

28 6. Services / Daemons dbus-daemon servicemanager avahi-daemon keystore nativeperms peripheralman sensorservice wpa_supplicant brilloaudioservice metrics_collector metriscsd perfprofd tlsdated tpm_managerd trunksd update_engine weaved webservd shill firewalld dhcpd 28

29 7. Weave 29

30 8. Example 30

31 9. Summing Up Cool use of AOSP The new standard Embedded Linux distro? Yocto Buildroot Work in progress Nice move to Binder (instead of DBus) Clear cloud component 31

32 Thank you... 32

Headless Android Android Builders Summit 2012 Karim

Headless Android Android Builders Summit 2012 Karim Yaghmour @karimyaghmour karim.yaghmour@opersys.com 1 These slides are made available to you under a Creative Commons Share-Alike 3.0 license. The full