https://www.chromium.org/chromium-os/quick-start-guide

root
adduser --disabled-login chromiumos

chromiumos
git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
echo "# depot_tools
if [ -d "$HOME/depot_tools" ] ; then
    PATH="$HOME/depot_tools:$PATH"
fi" >> ~/.profile
source ~/.profile