kata-manager: Accept only "lts" or "active" as containerd versions

kata-manager is a very nice tool, but we shouldn't be trying to take
care of "everything" in "all possible scenarios", and we should focus on
installing Kata Containers dependencies that are supported.

With this in mind, let's limit a little bit the scope of which versions
of containerd can be installed, limitting to "active" and "lts", which
will then install the latest version of those "flavours".  The default
value will always be "lts" as that's supposed to be the stable one.

NOTE: This is a breaking change, as it changes the behaviour of what the
script takes in its `-c` parameter.  I'm assuming here we're safe to do
so as the majority of the users should / would only be using the full
installation by default.

Fixes: #8356

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

utils/kata-manager.sh

@@ -25,6 +25,7 @@ readonly containerd_project_url="https://github.com/${containerd_slug}"
 
 readonly kata_releases_url="https://api.github.com/repos/${kata_slug}/releases"
 readonly containerd_releases_url="https://api.github.com/repos/${containerd_slug}/releases"
+readonly containerd_io_releases_url="https://raw.githubusercontent.com/containerd/containerd.io/main/content/releases.md"
 
 # Directory created when unpacking a binary release archive downloaded from
 # $kata_releases_url.
@@ -239,7 +240,9 @@ Description: Install $kata_project [1] (and optionally $containerd_project [2])
 
 Options:
 
- -c <version> : Specify containerd version.
+ -c <flavour> : Specify containerd flavour ("lts" | "active" - default: "lts").
+                Find more details on LTS and Active versions of containerd on
+                https://containerd.io/releases/#support-horizon
  -d           : Enable debug for all components.
  -f           : Force installation (use with care).
  -h           : Show this help statement.
@@ -669,9 +672,25 @@ handle_kata()
 	kata-runtime --version
 }
 
+containerd_version_number()
+{
+	local flavour="${1:-}"
+	[ -z "$flavour" ] && die "need containerd flavour"
+
+	base_version="$(curl -fsSL $containerd_io_releases_url | \
+		grep -iE "\[d+.d+\].*| $flavour" | \
+		grep -oE "\[[0-9]+.[0-9]+\]" | \
+		grep -oE "[0-9]+.[0-9]+")"
+
+	curl --silent ${containerd_releases_url} | \
+		jq -r .[].tag_name | \
+		grep "^v${base_version}.[0-9]*$" -m1
+}
+
 handle_containerd()
 {
-	local version="${1:-}"
+	local flavour="${1:-}"
+	[ -z "$flavour" ] && die "need containerd flavour"
 
 	local force="${2:-}"
 	[ -z "$force" ] && die "need force value"
@@ -679,6 +698,7 @@ handle_containerd()
 	local enable_debug="${3:-}"
 	[ -z "$enable_debug" ] && die "no enable debug value"
 
+	local version="$(containerd_version_number "$flavour")"
 	local ret
 
 	if [ "$force" = "true" ]
@@ -755,7 +775,7 @@ handle_installation()
 
 	# These params can be blank
 	local kata_version="${7:-}"
-	local containerd_version="${8:-}"
+	local containerd_flavour="${8:-}"
 
 	[ "$only_run_test" = "true" ] && test_installation && return 0
 
@@ -765,7 +785,7 @@ handle_installation()
 
 	[ "$skip_containerd" = "false" ] && \
 		handle_containerd \
-		"$containerd_version" \
+		"$containerd_flavour" \
 		"$force" \
 		"$enable_debug"
 
@@ -781,6 +801,14 @@ handle_installation()
 	echo -e "\n${warnings}\n"
 }
 
+validate_containerd_flavour()
+{
+	local flavour="${1:-}"
+	local flavours_regex='lts|active'
+
+	grep -qE "$flavours_regex" <<< "$flavour" || die "expected flavour to match '$flavours_regex', found '$flavour'"
+}
+
 handle_args()
 {
 	local cleanup="true"
@@ -793,12 +821,12 @@ handle_args()
 	local opt
 
 	local kata_version=""
-	local containerd_version=""
+	local containerd_flavour="lts"
 
 	while getopts "c:dfhk:ortT" opt "$@"
 	do
 		case "$opt" in
-			c) containerd_version="$OPTARG" ;;
+			c) containerd_flavour="$OPTARG" ;;
 			d) enable_debug="true" ;;
 			f) force="true" ;;
 			h) usage; exit 0 ;;
@@ -815,7 +843,9 @@ handle_args()
 	shift $[$OPTIND-1]
 
 	[ -z "$kata_version" ] && kata_version="${1:-}" || true
-	[ -z "$containerd_version" ] && containerd_version="${2:-}" || true
+	[ -z "$containerd_flavour" ] && containerd_flavour="${2:-}" || true
+
+	validate_containerd_flavour "$containerd_flavour"
 
 	handle_installation \
 		"$cleanup" \
@@ -825,7 +855,7 @@ handle_args()
 		"$disable_test" \
 		"$only_run_test" \
 		"$kata_version" \
-		"$containerd_version"
+		"$containerd_flavour"
 }
 
 main()