feat(system/upgrade): add upgrade banner [EE-4564] (#8046)

api/platform/platform.go

@@ -0,0 +1,44 @@
+package platform
+
+import "os"
+
+const (
+	PodmanMode            = "PODMAN"
+	KubernetesServiceHost = "KUBERNETES_SERVICE_HOST"
+	NomadJobName          = "NOMAD_JOB_NAME"
+)
+
+// ContainerPlatform represent the platform on which the container is running (Docker, Kubernetes, Nomad)
+type ContainerPlatform string
+
+const (
+	// PlatformDocker represent the Docker platform (Standalone/Swarm)
+	PlatformDocker = ContainerPlatform("Docker")
+	// PlatformKubernetes represent the Kubernetes platform
+	PlatformKubernetes = ContainerPlatform("Kubernetes")
+	// PlatformPodman represent the Podman platform (Standalone)
+	PlatformPodman = ContainerPlatform("Podman")
+	// PlatformNomad represent the Nomad platform (Standalone)
+	PlatformNomad = ContainerPlatform("Nomad")
+)
+
+// DetermineContainerPlatform will check for the existence of the PODMAN_MODE
+// or KUBERNETES_SERVICE_HOST environment variable to determine if
+// the container is running on Podman or inside the Kubernetes platform.
+// Defaults to Docker otherwise.
+func DetermineContainerPlatform() ContainerPlatform {
+	podmanModeEnvVar := os.Getenv(PodmanMode)
+	if podmanModeEnvVar == "1" {
+		return PlatformPodman
+	}
+	serviceHostKubernetesEnvVar := os.Getenv(KubernetesServiceHost)
+	if serviceHostKubernetesEnvVar != "" {
+		return PlatformKubernetes
+	}
+	nomadJobName := os.Getenv(NomadJobName)
+	if nomadJobName != "" {
+		return PlatformNomad
+	}
+
+	return PlatformDocker
+}