Merge "Add Docker instructions for older branches"

gitconfig

FROM ubuntu:14.04

ARG userid

ARG groupid

ARG username

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 openjdk-7-jdk

RUN curl -o jdk8.tgz https://android.googlesource.com/platform/prebuilts/jdk/jdk8/+archive/master.tar.gz \

 && tar -zxf jdk8.tgz linux-x86 \

 && mv linux-x86 /usr/lib/jvm/java-8-openjdk-amd64 \

 && rm -rf jdk8.tgz

RUN curl -o /usr/local/bin/repo https://storage.googleapis.com/git-repo-downloads/repo \

 && echo "e147f0392686c40cfd7d5e6f332c6ee74c4eab4d24e2694b3b0a0c037bf51dc5  /usr/local/bin/repo" | sha256sum --strict -c - \

 && chmod a+x /usr/local/bin/repo

RUN groupadd -g $groupid $username \

 && useradd -m -u $userid -g $groupid $username \

 && echo $username >/root/username \

 && echo "export USER="$username >>/home/$username/.gitconfig

COPY gitconfig /home/$username/.gitconfig

RUN chown $userid:$groupid /home/$username/.gitconfig

ENV HOME=/home/$username

ENTRYPOINT chroot --userspec=$(cat /root/username):$(cat /root/username) / /bin/bash -i

The Dockerfile in this directory sets up an Ubuntu Trusty image ready to build

a variety of Android branches (>= Lollipop). It's particulary useful to build

older branches that required 14.04 if you've upgraded to something newer.

First, build the image:

```

# Copy your host gitconfig, or create a stripped down version

$ cp ~/.gitconfig gitconfig

$ docker build --build-arg userid=$(id -u) --build-arg groupid=$(id -g) --build-arg username=$(id -un) -t android-build-trusty .

```

Then you can start up new instances with:

```

$ docker run -it --rm -v $ANDROID_BUILD_TOP:/src android-build-trusty

> cd /src; source build/envsetup.sh

> lunch aosp_arm-eng

> m -j50

```