Install docker for tests

We have some test cases which attempt to build docker images, therefore
we need docker.

Fix a few bugs that showed up when we run docker tests - we need to
docker rm with sudo and docker images don't always have a /tmp so check
before unmounting it.

Change-Id: I147d0ef3f2ea83f35bac568214573a6bde0b1967

bin/disk-image-create

@@ -434,7 +434,7 @@ for X in ${!IMAGE_TYPES[@]} ; do
   elif [ "${IMAGE_TYPES[$X]}" == "docker" ]; then
     sudo tar -C ${TMP_BUILD_DIR}/mnt -cf - --exclude ./sys \
              --exclude ./proc --xattrs --xattrs-include=\* . \
-        | docker import - $DOCKER_TARGET
+        | sudo docker import - $DOCKER_TARGET
     unset IMAGE_TYPES[$X]
   fi
 done

lib/img-functions

@@ -121,7 +121,9 @@ function finalise_base () {
         fi
     fi
     # Cleanup /tmp in the guest, so there is less cruft left there
+    if [ -d "$TMP_MOUNT_PATH/tmp" ]; then
         unmount_dir $TMP_MOUNT_PATH/tmp
+    fi
     find $TMP_MOUNT_PATH/tmp -maxdepth 1 -mindepth 1 | xargs sudo rm -rf --one-file-system
 }
 

tests/install_test_deps.sh

@@ -4,13 +4,17 @@ set -eux
 set -o pipefail
 
 sudo apt-get update || true
-sudo apt-get install -y \
+sudo apt-get install -y --force-yes \
+        apt-transport-https \
         debootstrap \
+        docker.io \
         inetutils-ping \
+        lsb-release \
         kpartx \
         qemu-utils \
         uuid-runtime || \
     sudo yum -y install \
         debootstrap \
+        docker \
         kpartx \
         qemu-img

tests/run_output_format_test.sh

@@ -26,7 +26,7 @@ function build_test_image() {
     dest_dir=$(mktemp -d)
     base_dest=$(basename $dest_dir)
 
-    trap "rm -rf $dest_dir; docker rmi $base_dest/image" EXIT
+    trap "rm -rf $dest_dir; sudo docker rmi $base_dest/image" EXIT
 
     ELEMENTS_PATH=$DIB_ELEMENTS:$TEST_ELEMENTS \
         $DIB_CMD -x $type_arg --docker-target=$base_dest/image \
@@ -43,7 +43,7 @@ function build_test_image() {
                 echo "Found image $img_path."
             fi
         else
-            if ! docker images | grep $base_dest/image ; then
+            if ! sudo docker images | grep $base_dest/image ; then
                 echo "Error: No docker image with name $base_dest/image found!"
                 exit 1
             else
@@ -54,8 +54,8 @@ function build_test_image() {
 
     trap EXIT
     rm -rf $dest_dir
-    if docker images | grep $base_dest/image ; then
-        docker rmi $base_dest/image
+    if sudo docker images | grep $base_dest/image ; then
+        sudo docker rmi $base_dest/image
     fi
 }