Environment Setup for building Lineage OS

envsetup.sh

source ~/android/venv/bin/activate
export LC_TIME=C
export LC_ALL=C
export ANDROID_JACK_VM_ARGS="-Dfile.encoding=UTF-8 -XX:+TieredCompilation -Xmx5G"
export USE_CCACHE=1
export JACK_SERVER_VM_ARGUMENTS="-Dfile.encoding=UTF-8 -XX:+TieredCompilation -Xmx4096m"
export _JAVA_OPTIONS="-Xmx5g"

sign_package.sh

# Generate Keys
subject='/C=US/ST=California/L=Mountain View/O=Android/OU=Android/CN=Android/emailAddress=android@android.com'
mkdir ~/.android-certs
for x in releasekey platform shared media; do \
    ./development/tools/make_key ~/.android-certs/$x "$subject"; \
done

# Signing Target Files
croot
./build/tools/releasetools/sign_target_files_apks -o -d ~/.android-certs \
    out/dist/*-target_files-*.zip \
    signed-target_files.zip

# mka otatools or generating the install package fails
mka -j4 otatools

# Generating the install package
./build/tools/releasetools/ota_from_target_files -k ~/.android-certs/releasekey \
    --block --backup=true \
    signed-target_files.zip \
    signed-ota_update.zip