docker: move back to installing via apt

install.sh

@@ -161,30 +161,29 @@ install_i3() {
 }
 
 install_docker() {
+    # https://docs.docker.com/install/linux/docker-ce/debian/#install-using-the-repository
+
+    # bad experiences with static binaries...
     # https://docs.docker.com/engine/installation/binaries/#install-static-binaries
-    VERS="18.03.1-ce"
     echo "installing docker binary Version $VERS ..."
     # https://github.com/tianon/cgroupfs-mount/blob/master/cgroupfs-mount
 
-    # omg! you changed the static download URL - AGAIN!??! and removed the checksums? wtf?
-    # TODO move to apt packages again
-    # TODO also make sure raspbian/arm setup works.
-    curl -SL https://download.docker.com/linux/static/stable/x86_64/docker-$VERS.tgz \
-         -o /tmp/docker.tgz
-    # curl -SL https://get.docker.com/builds/Linux/x86_64/docker-$VERS.tgz.sha256 \
-    #      -o /tmp/docker.tgz.sha256
+    apt-get install \
+            apt-transport-https \
+            ca-certificates \
+            curl \
+            gnupg2 \
+            software-properties-common
 
-    cd /tmp
+    curl -fsSL https://download.docker.com/linux/debian/gpg | sudo apt-key add -
 
-    # if [ ! $(cat /tmp/docker.tgz.sha256 | sha256sum -c -) ]; then
-    #     echo "... checksum failed... stopping"
-    #     exit 1;
-    # fi
+    # add docker apt repo
+    cat <<-EOF > /etc/apt/sources.list.d/docker.list
+    deb [arch=amd64] https://download.docker.com/linux/debian stretch stable
+    # deb [arch=amd64] https://download.docker.com/linux/debian stretch test
+    # deb [arch=amd64] https://download.docker.com/linux/debian stretch nightly
+EOF
 
-    tar -xvzf docker.tgz
-    mv docker/* /usr/bin
-    rm /tmp/docker.tgz
-    # rm /tmp/docker.tgz.sha256
 
 }