Building LTP for Android (complete walkthrough)

This tutorial will walk you through building LTP for Android, starting from scratch.

Install build tools

Follow the instructions here based on your operating system:

https://source.android.com/docs/setup/start/initializing?hl=en

Install repo

sudo apt-get update
sudo apt-get install repo

(https://source.android.com/docs/setup/download?hl=en)

Checkout AOSP

WARNING: this step downloads ~300GB of files from the AOSP repository.

mkdir aosp-master
cd aosp-master
repo init -u https://android.googlesource.com/platform/manifest -b master --partial-clone --clone-filter=blob:limit=10M
repo sync -c -j8

(https://source.android.com/docs/setup/download/downloading?hl=en)

Set up environment

This configures the tooling to target cuttlefish arm64:

source build/envsetup.sh
lunch aosp_cf_arm64_phone-userdebug

Alternatively, this will target 32-bit arm:

source build/envsetup.sh
lunch aosp_cf_arm_only_phone-userdebug

If you are targeting something else, you can follow the link below for further instructions on how to adjust the target accordingly:

https://source.android.com/docs/setup/build/building?hl=en#choose-a-target

Build ADB and atest

m -j adb atest
adb version

(https://source.android.com/docs/setup/build/adb?hl=en)

Connect the device

Connect the device to your system and verify that ADB can see it.

adb devices

Two ways to run LTP:

Use atest tool to build and run tests

https://android.googlesource.com/platform/external/ltp/+/master/android/README.md#running-ltp-through-atest

atest -a vts_ltp_test_arm     # 32-bit arm tests
atest -a vts_ltp_test_arm_64  # 64-bit arm tests

Manually build and run tests

This is faster to build but requires more manual steps.

Setup temporary directories:

adb root
adb shell "mkdir -p /data/local/tmp/ltp/tmp/ltptemp; mkdir -p /data/local/tmp/ltp/tmp/tmpbase; mkdir -p /data/local/tmp/ltp/tmp/tmpdir; restorecon -F -R /data/local/tmp/ltp"

This example builds ltp and runs the pcrypt_aead01 binary:

cd external/ltp
mma
adb sync data
adb shell "TMP=/data/local/tmp/ltp/tmp LTPTMP=/data/local/tmp/ltp/tmp/ltptemp LTP_DEV_FS_TYPE=ext4 TMPBASE=/data/local/tmp/ltp/tmp/tmpbase TMPDIR=/data/local/tmp/ltp/tmp/tmpdir LTPROOT=/data/local/tmp/ltp PATH=/data/nativetest64/ltp/testcases/bin:$PATH pcrypt_aead01"

(https://android.googlesource.com/platform/external/ltp/+/master/android/README.md#running-ltp-directly)

Modify an existing test and rerun it

After making code changes to an existing test, following either of the previous steps will rebuild and run it.

If you are applying a patch file, you may do the following, filling in the patch file and binary:

cd external/ltp
git apply <patch filename>.patch
mma
adb sync data
adb shell "TMP=/data/local/tmp/ltp/tmp LTPTMP=/data/local/tmp/ltp/tmp/ltptemp LTP_DEV_FS_TYPE=ext4 TMPBASE=/data/local/tmp/ltp/tmp/tmpbase TMPDIR=/data/local/tmp/ltp/tmp/tmpdir LTPROOT=/data/local/tmp/ltp PATH=/data/nativetest64/ltp/testcases/bin:$PATH <test binary>"