build and run an android aos automagically on Ubuntu 14.04

aos.sh

#!/bin/bash

# Configurable options
REPO_TAG=android-4.4.3_r1.1
LUNCH_TARGET=aosp_arm-eng
CCACHE_SIZE=10G
WORKDIR=aos_workdir

# Below this is just all the script crap
set -e # abort after first error
set -v # echo commands before running

sudo apt-get update
sudo apt-get install oracle-java6-installer  bison g++-multilib git gperf libxml2-utils curl

if [ ! -d "$WORKDIR" ]; then
  mkdir "$WORKDIR"
fi
cd $WORKDIR

if [ ! -f "./repo" ]; then
  curl https://storage.googleapis.com/git-repo-downloads/repo > ./repo
  chmod +x repo
fi

if [ ! -f "./.repo" ]; then
  # Note --depth 1, so we don't acquire entire history, just the top part
  ./repo init -u https://android.googlesource.com/platform/manifest --depth 1 -b $REPO_TAG
fi

# Sync the repository (pull the most recent version of everything)
./repo sync

export USE_CCACHE=1
if [ ! -d "$HOME/.ccache" ]; then
  mkdir "$HOME/.ccache"
fi

./prebuilts/misc/linux-x86/ccache/ccache -M $CCACHE_SIZE

# Load the aos build shit
. build/envsetup.sh

# Target: aosp_arm-eng
lunch $LUNCH_TARGET

# Actually try and build everything - cross your fingers and hope this works
make -j $(nproc)