Add cross-compile docker build env.

build-scripts/docker-build-env/Dockerfile

@@ -0,0 +1,29 @@
+FROM ubuntu:16.04
+
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+
+# Install docker
+# https://docs.docker.com/engine/installation/linux/ubuntu/#install-using-the-repository
+RUN apt-get update && apt-get install -y \
+    apt-transport-https \
+    ca-certificates \
+    curl \
+    software-properties-common \
+    && rm -rf /var/lib/apt/lists/*
+VOLUME /var/lib/docker
+RUN curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
+RUN add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
+RUN apt-get update && apt-get install -y docker-ce && rm -rf /var/lib/apt/lists/*
+
+# setup arm binary support
+RUN apt-get update && apt-get install -y \
+    qemu-user-static \
+    binfmt-support \
+    && rm -rf /var/lib/apt/lists/*
+RUN mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc \
+    && update-binfmts --enable qemu-arm
+
+COPY run-docker.sh
+
+WORKDIR /docker

build-scripts/docker-build-env/create_build_env.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+set -ev
+
+DOCKER_REPO=pvizeli
+DOCKER_IMAGE=docker-build-env
+
+# Get the absolute script location
+pushd `dirname $0` > /dev/null 2>&1
+SCRIPTPATH=`pwd`
+popd > /dev/null 2>&1
+
+# Sanity checks
+if [ "$#" -ne 1 ]; then
+    echo "Usage: create_build_env.sh [<REVISION> | NONE]"
+    exit 1
+fi
+
+REVISION=$1
+
+# Build
+docker build --pull --tag ${DOCKER_REPO}/${DOCKER_IMAGE}:${REVISION} -f ${SCRIPTPATH}/Dockerfile ${SCRIPTPATH}
+
+# Tag
+docker tag ${DOCKER_REPO}/${DOCKER_IMAGE}:${REVISION} ${DOCKER_REPO}/${DOCKER_IMAGE}:latest
+
+if [ ${REVISION} != "NONE" ]; then
+    # push
+    docker push ${DOCKER_REPO}/${DOCKER_IMAGE}:${REVISION}
+    docker push ${DOCKER_REPO}/${DOCKER_IMAGE}:latest
+fi

build-scripts/docker-build-env/run-docker.sh

@@ -0,0 +1,59 @@
+#!/bin/bash
+
+set -e
+
+DOCKER_TIMEOUT=20 # Wait 20 seconds for docker to start
+
+cleanup() {
+    echo "[INFO] Running cleanup..."
+
+    # Stop docker gracefully
+    echo "[INFO] Stopping in container docker..."
+    DOCKERPIDFILE=/var/run/docker.pid
+    if [ -f $DOCKERPIDFILE ] && [ -s $DOCKERPIDFILE ] && ps $(cat $DOCKERPIDFILE) | grep -q docker; then
+        kill $(cat $DOCKERPIDFILE)
+        # Now wait for it to die
+        STARTTIME=$(date +%s)
+        ENDTIME=$(date +%s)
+        while [ -f $DOCKERPIDFILE ] && [ -s $DOCKERPIDFILE ] && ps $(cat $DOCKERPIDFILE) | grep -q docker; do
+            if [ $(($ENDTIME - $STARTTIME)) -le $DOCKER_TIMEOUT ]; then
+                sleep 1
+                ENDTIME=$(date +%s)
+            else
+                echo "[ERROR] Timeout while waiting for in container docker to die."
+                exit 1
+            fi
+        done
+    else
+        echo "[WARN] Can't stop docker container."
+        echo "[WARN] Your host might have been left with unreleased resources (ex. loop devices)."
+    fi
+
+    if [ "$1" == "fail" ]; then
+        exit 1
+    fi
+}
+trap 'cleanup fail' SIGINT SIGTERM
+
+# Start docker
+echo "[INFO] Starting docker."
+dockerd 2> /dev/null &
+echo "[INFO] Waiting for docker to initialize..."
+STARTTIME=$(date +%s)
+ENDTIME=$(date +%s)
+until docker info >/dev/null 2>&1; do
+    if [ $(($ENDTIME - $STARTTIME)) -le $DOCKER_TIMEOUT ]; then
+        sleep 1
+        ENDTIME=$(date +%s)
+    else
+        echo "[ERROR] Timeout while waiting for docker to come up."
+        exit 1
+    fi
+done
+echo "[INFO] Docker was initialized."
+
+# Start barys with all the arguments requested
+echo "[INFO] Running build..."
+
+cleanup
+exit 0