kata-manager: Add support for docker installation

Add support for also installing the Docker CLI, giving users the chance
to try Kata Containers with docker in the same way we provide users the
chance to try Kata Containers with `ctr`.

Fixes: #8357

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>

utils/kata-manager.sh

@@ -244,6 +244,7 @@ Options:
                 Find more details on LTS and Active versions of containerd on
                 https://containerd.io/releases/#support-horizon
  -d           : Enable debug for all components.
+ -D           : Install Docker server and CLI tooling (takes priority over '-c').
  -f           : Force installation (use with care).
  -h           : Show this help statement.
  -k <version> : Specify Kata Containers version.
@@ -720,10 +721,41 @@ handle_containerd()
 	containerd --version
 }
 
+handle_docker()
+{
+	{ containerd_installed; ret=$?; } || true
+	if [ "$ret" -eq 0 ]
+	then
+		info "Backing up previous $containerd_project configuration"
+		local cfg="/etc/containerd/config.toml"
+
+		[ -e "$cfg" ] && sudo mv $cfg $cfg.system-$(date -Iseconds)
+	fi
+
+	containerd_installed
+
+	local filename='get-docker.sh'
+
+	local file
+	file="$tmpdir/$filename"
+
+	curl -fsSL https://get.docker.com -o "$file"
+	sudo sh "$file"
+
+	rm -rf "$file"
+
+	sudo systemctl enable --now docker
+
+	configure_containerd "$enable_debug"
+
+	containerd --version
+	docker --version
+}
+
 test_installation()
 {
 	local tool="${1:-}"
-	[ -z "$tool" ] && die "The tool to test $kata_project with was not informed"
+	[ -z "$tool" ] && die "The tool to test $kata_project with was not specified"
 
 	info "Testing $kata_project\n"
 
@@ -736,13 +768,24 @@ test_installation()
 
 	# Used to prove that the kernel in the container
 	# is different to the host kernel.
-	local container_kernel
-	container_kernel=$(sudo $tool run \
-		--runtime "$kata_runtime_type" \
-		--rm \
-		"$image" \
-		"$container_name" \
-		uname -r || true)
+	cmd="sudo $tool run --runtime "$kata_runtime_type" --rm"
+	case "$tool" in
+		docker)
+			# docker takes the container name as `--name
+			# $container_name`, passed to the run option.
+		       	cmd+=" --name $container_name" ;;
+	esac
+	cmd+=" $image"
+	case "$tool" in
+		ctr)
+			# ctr takes the container name as a mandatory
+			# argument after the image name
+			cmd+=" $container_name" ;;
+	esac
+	cmd+=" uname -r"
+
+	info "Running \"$cmd\""
+	container_kernel=$(eval "$cmd" || true)
 
 	[ -z "$container_kernel" ] && die "Failed to test $kata_project"
 
@@ -780,9 +823,24 @@ handle_installation()
 	local kata_version="${7:-}"
 	local containerd_flavour="${8:-}"
 
+	local install_docker="${9:-}"
+	[ -z "$install_docker" ] && die "no install docker value"
+
 	# The tool to be testing the installation with
 	local tool="ctr"
 
+	if [ "$install_docker" = "true" ]
+	then
+		if [ "$skip_containerd" = "false" ]
+		then
+			# The script provided by docker already takes care
+			# of properly installing containerd
+			skip_containerd="true"
+			info "Containerd will be installed during the Docker installation ('-c' option ignored)"
+		fi
+		tool="docker"
+	fi
+
 	[ "$only_run_test" = "true" ] && test_installation "$tool"  && return 0
 
 	setup "$cleanup" "$force" "$skip_containerd"
@@ -795,13 +853,17 @@ handle_installation()
 		"$force" \
 		"$enable_debug"
 
+	[ "$install_docker" = "true" ] && handle_docker
+
 	[ "$disable_test" = "false" ] && test_installation "$tool"
 
-	if [ "$skip_containerd" = "true" ]
+	if [ "$skip_containerd" = "true" ] && [ "$install_docker" = "false" ]
 	then
 		info "$kata_project is now installed"
 	else
-		info "$kata_project and $containerd_project are now installed"
+		local extra_projects="containerd"
+		[ "$install_docker" = "true" ] && extra_projects+=" and docker"
+		info "$kata_project and $extra_projects are now installed"
 	fi
 
 	echo -e "\n${warnings}\n"
@@ -823,17 +885,19 @@ handle_args()
 	local disable_test="false"
 	local only_run_test="false"
 	local enable_debug="false"
+	local install_docker="false"
 
 	local opt
 
 	local kata_version=""
 	local containerd_flavour="lts"
 
-	while getopts "c:dfhk:ortT" opt "$@"
+	while getopts "c:dDfhk:ortT" opt "$@"
 	do
 		case "$opt" in
 			c) containerd_flavour="$OPTARG" ;;
 			d) enable_debug="true" ;;
+			D) install_docker="true" ;;
 			f) force="true" ;;
 			h) usage; exit 0 ;;
 			k) kata_version="$OPTARG" ;;
@@ -861,7 +925,8 @@ handle_args()
 		"$disable_test" \
 		"$only_run_test" \
 		"$kata_version" \
-		"$containerd_flavour"
+		"$containerd_flavour" \
+		"$install_docker"
 }
 
 main()