refine doc

android-builder-docker/Dockerfile

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+FROM ubuntu:14.04
+
+ARG userid
+ARG groupid
+ARG username
+
+# COPY apt.conf /etc/apt/apt.conf
+
+#COPY sources.list etc/apt/sources.list
+
+# gettext python-mako python3-mako python-enum34 used to build mesa3d
+RUN apt-get update && apt-get install -y git-core gnupg flex bison gperf build-essential zip curl zlib1g-dev gcc-multilib g++-multilib libc6-dev-i386 lib32ncurses5-dev x11proto-core-dev libx11-dev lib32z-dev ccache libgl1-mesa-dev libxml2-utils xsltproc unzip python gettext python-mako python3-mako python-enum34
+
+RUN groupadd -g $groupid $username \
+ && useradd -m -u $userid -g $groupid $username \
+ && echo "$username ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers \
+ && echo $username >/root/username \
+ && echo "$username:$username" | chpasswd && adduser $username sudo
+
+ENV HOME=/home/$username \
+    USER=$username \
+    PATH=/src/.repo/repo:/src/prebuilts/jdk/jdk8/linux-x86/bin/:$PATH \
+    USE_CCACHE=1 \
+    CCACHE_DIR=/src/.ccache
+
+ENTRYPOINT chroot --userspec=$(cat /root/username):$(cat /root/username) / /bin/bash -i