stdlib: implemented generic kubectl apply + fixes in eks

Signed-off-by: Sam Alba <sam.alba@gmail.com>

stdlib/aws/eks/code.cue

@@ -2,7 +2,8 @@ package eks
 
 #Code: #"""
 	[ -e /cache/bin/kubectl ] || {
-	    curl -sfL https://dl.k8s.io/v1.19.9/bin/linux/amd64/kubectl -o /cache/bin/kubectl && chmod +x /cache/bin/kubectl
+	    curl -sfL https://dl.k8s.io/${KUBECTL_VERSION}/bin/linux/amd64/kubectl -o /cache/bin/kubectl \
+		&& chmod +x /cache/bin/kubectl
 	}
 
 	export KUBECONFIG=/kubeconfig

stdlib/aws/eks/eks.cue

@@ -1,6 +1,7 @@
 package eks
 
 import (
+	"dagger.io/dagger"
 	"dagger.io/llb"
 	"dagger.io/aws"
 )
@@ -13,6 +14,9 @@ import (
 	// EKS cluster name
 	clusterName: string
 
+	// Kubectl version
+	version: *"v1.19.9" | string
+
 	// kubeconfig is the generated kube configuration file
 	kubeconfig: {
 		dagger.#Secret
@@ -44,6 +48,7 @@ import (
 					AWS_DEFAULT_OUTPUT:    "json"
 					AWS_PAGER:             ""
 					EKS_CLUSTER:           clusterName
+					KUBECTL_VERSION:       version
 				}
 				mount: {
 					"/cache/aws": "cache"

stdlib/kubernetes/kubernetes.cue

@@ -0,0 +1,105 @@
+package kubernetes
+
+import (
+	"dagger.io/llb"
+	"dagger.io/dagger"
+	"dagger.io/alpine"
+)
+
+#Kubectl: {
+
+	version: *"v1.19.9" | string
+
+	#code: #"""
+		[ -e /usr/local/bin/kubectl ] || {
+			curl -sfL https://dl.k8s.io/${KUBECTL_VERSION}/bin/linux/amd64/kubectl -o /usr/local/bin/kubectl \
+			&& chmod +x /usr/local/bin/kubectl
+		}
+		"""#
+
+	#compute: [
+		llb.#Load & {
+			from: alpine.#Image & {
+				package: bash:      "=5.1.0-r0"
+				package: jq:        "=1.6-r1"
+				package: curl:      "=7.74.0-r1"
+			}
+		},
+		llb.#WriteFile & {
+			dest:    "/entrypoint.sh"
+			content: #code
+		},
+		llb.#Exec & {
+			args: [
+				"/bin/bash",
+				"--noprofile",
+				"--norc",
+				"-eo",
+				"pipefail",
+				"/entrypoint.sh",
+			]
+			env: {
+				KUBECTL_VERSION: version
+			}
+		}
+	]
+}
+
+// Apply a Kubernetes configuration
+#Apply: {
+	// Kubernetes config to deploy
+	source: string | dagger.#Artifact
+
+	// Kubernetes Namespace to deploy to
+	namespace: string
+
+	// Version of kubectl client
+	version: *"v1.19.9" | string
+
+	// Kube config file
+	kubeconfig: dagger.#Secret
+
+	#code: #"""
+		kubectl create namespace "$KUBE_NAMESPACE" || true
+		kubectl --namespace "$KUBE_NAMESPACE" apply -R -f /source
+		"""#
+
+	#compute: [
+		llb.#Load & {
+			from: #Kubectl & { "version": version }
+		},
+		llb.#WriteFile & {
+			dest:    "/entrypoint.sh"
+			content: #code
+		},
+		llb.#WriteFile & {
+			dest:    "/kubeconfig"
+			content: kubeconfig
+			mode:    0o600
+		},
+		if (source & string) != _|_ {
+			llb.#WriteFile & {
+				dest: "/source"
+				content: source
+			}
+		}
+		llb.#Exec & {
+			always: true
+			args: [
+				"/bin/bash",
+				"--noprofile",
+				"--norc",
+				"-eo",
+				"pipefail",
+				"/entrypoint.sh",
+			]
+			env: {
+				KUBECONFIG: "/kubeconfig"
+				KUBE_NAMESPACE: namespace
+			}
+			if (source & dagger.#Artifact) != _|_ {
+				mount: "/source": source
+			}
+		}
+	]
+}