Update docker to CE 17.03

https://docs.docker.com/engine/installation/linux/ubuntu/#install-from-a-package
has helpful instructions.

This should also help use userns at some point (https://github.com/moby/moby/pull/25540)

Fixes #303

baseimage/initializeBaseUbuntuImage.sh

@@ -51,47 +51,15 @@ apt-get install -y python   # Install python which is required for npm rebuild
 
 # https://docs.docker.com/engine/installation/linux/ubuntulinux/
 echo "==> Installing Docker"
-docker_key="-----BEGIN PGP PUBLIC KEY BLOCK-----
-Version: GnuPG v1
-
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-TvBR8Q==
-=Fm3p
------END PGP PUBLIC KEY BLOCK-----
-"
-echo "$docker_key" | apt-key add -
-echo "deb https://apt.dockerproject.org/repo ubuntu-xenial main" > /etc/apt/sources.list.d/docker.list
-apt-get -y update
 
 # create systemd drop-in file
 mkdir -p /etc/systemd/system/docker.service.d
 echo -e "[Service]\nExecStart=\nExecStart=/usr/bin/dockerd -H fd:// --log-driver=journald --exec-opt native.cgroupdriver=cgroupfs --storage-driver=devicemapper" > /etc/systemd/system/docker.service.d/cloudron.conf
 
-apt-get -y --allow-downgrades install docker-engine=1.12.5-0~ubuntu-xenial # apt-cache madison docker-engine
-apt-mark hold docker-engine # do not update docker
+curl -sL https://download.docker.com/linux/ubuntu/dists/xenial/pool/stable/amd64/docker-ce_17.03.1~ce-0~ubuntu-xenial_amd64.deb -O /tmp/docker.deb
+dpkg -i /tmp/docker.deb
+rm /tmp/docker.deb
+
 storage_driver=$(docker info | grep "Storage Driver" | sed 's/.*: //')
 if [[ "${storage_driver}" != "devicemapper" ]]; then
     echo "Docker is using "${storage_driver}" instead of devicemapper"

scripts/installer.sh

@@ -71,6 +71,19 @@ fi
 # ensure we are not inside the source directory, which we will remove now
 cd /root
 
+echo "==> installer: updating packages"
+if [[ $(docker version --format {{.Client.Version}}) != "17.03.1-ce" ]]; then
+    curl -sL https://download.docker.com/linux/ubuntu/dists/xenial/pool/stable/amd64/docker-ce_17.03.1~ce-0~ubuntu-xenial_amd64.deb -o /tmp/docker.deb
+    # https://download.docker.com/linux/ubuntu/dists/xenial/stable/binary-amd64/Packages
+    if [[ $(md5sum /tmp/docker.deb | cut -d' ' -f1) != "d6d175900edd243abbdb253990b2fe59" ]]; then
+        echo "docker binary download is corrupt"
+        exit 5
+    fi
+    apt-get remove -y --allow-change-held-packages docker-engine || true
+    dpkg -i /tmp/docker.deb
+    rm /tmp/docker.deb
+fi
+
 echo "==> installer: switching the box code"
 rm -rf "${BOX_SRC_DIR}"
 mv "${box_src_tmp_dir}" "${BOX_SRC_DIR}"