add version checker script

scripts/version.sh

@@ -0,0 +1,120 @@
+#!/bin/bash
+
+# TODO: where to extract the latest version of the tools from?
+
+# Source: https://semver.org/
+# Using a simplified version of semantic versioning regex pattern, which is bash compatible
+SEM_VER_REGEX="^([0-9]+)\.([0-9]+)\.([0-9]+)(-[0-9A-Za-z-]+(\.[0-9A-Za-z-]+)*)?(\+[0-9A-Za-z-]+(\.[0-9A-Za-z-]+)*)?$"
+
+# Set default values for variables
+KUBECTL_VERSION_DEFAULT="1.31.3"
+GO_VERSION_DEFAULT="1.23.3"
+K3D_VERSION_DEFAULT="5.6.0"
+DOCKER_VERSION_DEFAULT="27.3.1"
+
+# Function to compare two versions
+# Returns:
+# 0 if the versions are equal
+# 1 if the first version is less than the second version
+# 2 if the first version is greater than the second version
+function version_comparator() {
+  if [[ "$1" == "$2" ]]; then
+    echo 0
+    return
+  fi
+
+  local first_version; first_version=$(echo -e "$1\n$2" | sort --version-sort | head -n1)
+
+  if [[ "$first_version" == "$1" ]]; then
+    echo 1
+    return
+  fi
+  echo 2
+  return
+}
+
+function print_warning() {
+  echo "[WARNING] Using a version of $1 that is older than the recommended version: $2"
+}
+
+# Parse command line arguments
+while [[ "$#" -gt 0 ]]; do
+  case $1 in
+    --kubectl-version)
+      KUBECTL_VERSION="$2"
+      if [[ ! $KUBECTL_VERSION =~ $SEM_VER_REGEX ]]; then
+        echo "Invalid kubectl version: $KUBECTL_VERSION"
+        exit 2
+      fi
+
+      [[ $(version_comparator "$KUBECTL_VERSION" "$KUBECTL_VERSION_DEFAULT") -eq 1 ]] \
+        && print_warning "kubectl" "$KUBECTL_VERSION_DEFAULT" \
+        || echo "kubectl version is up to date"
+
+      shift 2
+      ;;
+    --go-version)
+      GO_VERSION="$2"
+      if [[ ! $GO_VERSION =~ $SEM_VER_REGEX ]]; then
+        echo "Invalid Go version: $GO_VERSION"
+        exit 2
+      fi
+
+      [[ $(version_comparator "$GO_VERSION" "$GO_VERSION_DEFAULT") -eq 1 ]] \
+        && print_warning "Go" "$GO_VERSION_DEFAULT" \
+        || echo "kubectl version is up to date"
+
+      shift 2
+      ;;
+    --k3d-version)
+      K3D_VERSION="$2"
+      if [[ ! $K3D_VERSION =~ $SEM_VER_REGEX ]]; then
+        echo "Invalid k3d version: $K3D_VERSION"
+        exit 2
+      fi
+
+      [[ $(version_comparator "$K3D_VERSION" "$K3D_VERSION_DEFAULT") -eq 1 ]] \
+        && print_warning "k3d" "$K3D_VERSION_DEFAULT" \
+        || echo "kubectl version is up to date"
+
+      shift 2
+      ;;
+    --docker-version)
+      DOCKER_VERSION="$2"
+      if [[ ! $DOCKER_VERSION =~ $SEM_VER_REGEX ]]; then
+        echo "Invalid Docker version: $DOCKER_VERSION"
+        exit 2
+      fi
+
+      [[ $(version_comparator "$DOCKER_VERSION" "$DOCKER_VERSION_DEFAULT") -eq 1 ]] \
+        && print_warning "docker" "$DOCKER_VERSION_DEFAULT" \
+        || echo "kubectl version is up to date"
+
+      shift 2
+      ;;
+    *)
+      echo "Unknown option: $1"
+      echo "Example usage:"
+      echo "  ./version.sh --kubectl-version kubectl_version --go-version go_version --k3d-version k3d_version --docker-version docker_version"
+      echo "  ./version.sh --kubectl-version kubectl_version --go-version go_version"
+      echo "  ./version.sh"
+      exit 1
+      ;;
+  esac
+done
+
+# Use default values if not provided
+KUBECTL_VERSION=${KUBECTL_VERSION:-$KUBECTL_VERSION_DEFAULT}
+GO_VERSION=${GO_VERSION:-$GO_VERSION_DEFAULT}
+K3D_VERSION=${K3D_VERSION:-$K3D_VERSION_DEFAULT}
+DOCKER_VERSION=${DOCKER_VERSION:-$DOCKER_VERSION_DEFAULT}
+
+# Print the arguments
+echo "Using the following versions:"
+echo "kubectl: $KUBECTL_VERSION"
+echo "Go: $GO_VERSION"
+echo "k3d: $K3D_VERSION"
+echo "Docker: $DOCKER_VERSION"
+
+# TODO: Export the versions or set corresponding environment variables
+# Or exit with error code 1 if the desired versions are not present