porch: create simple standalone app (#2830)

We need an app that doesn't have validators etc.

Author: justinsb

porch/config/samples/apps/hello-server/Dockerfile

@@ -0,0 +1,29 @@
+# Copyright 2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+FROM golang:1.17-bullseye as builder
+
+WORKDIR /src
+COPY go.mod go.sum ./
+
+WORKDIR /src
+COPY *.go .
+
+RUN CGO_ENABLED=0 go build -o /hello-server -v .
+
+FROM gcr.io/distroless/static
+WORKDIR /
+COPY --from=builder /hello-server /hello-server
+
+ENTRYPOINT ["/hello-server"]

porch/config/samples/apps/hello-server/Makefile

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+# Copyright 2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# GCP project to use for development
+GCP_PROJECT_ID ?= $(shell gcloud config get-value project)
+IMAGE_TAG ?= latest
+IMAGE_REPO ?= gcr.io/$(GCP_PROJECT_ID)
+IMAGE_NAME ?= hello-server
+
+.PHONY: push-image
+push-image:
+	docker buildx build --push --tag $(IMAGE_REPO)/$(IMAGE_NAME):$(IMAGE_TAG) .
+
+.PHONY: build-image
+build-image:
+	docker buildx build --load --tag $(IMAGE_REPO)/$(IMAGE_NAME):$(IMAGE_TAG) .

porch/config/samples/apps/hello-server/go.mod

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+module github.com/GoogleContainerTools/kpt/porch/config/samples/apps/hello
+
+go 1.17

porch/config/samples/apps/hello-server/go.sum

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+apiVersion: kpt.dev/v1
+kind: Kptfile
+metadata:
+  name: hello-server
+info:
+  emails:
+    - [email protected]
+  description: This is an example package.
+# pipeline:
+#   validators:
+#     - image: gcr.io/kpt-fn/kubeval:v0.1
+#       configMap:
+#         strict: "true"

porch/config/samples/apps/hello-server/k8s/Kptfile

@@ -0,0 +1,32 @@
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: hello-server
+  namespace: hello-server
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: hello-server
+  template:
+    metadata:
+      labels:
+        app: hello-server
+    spec:
+      containers:
+        - name: hello-server
+          image: "gcr.io/example-google-project-id/hello-server:latest"

porch/config/samples/apps/hello-server/k8s/deployment.yaml

@@ -0,0 +1,18 @@
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: hello-server

porch/config/samples/apps/hello-server/k8s/ns.yaml

@@ -0,0 +1,27 @@
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+apiVersion: v1
+kind: Service
+metadata:
+  name: hello-server
+  namespace: hello-server
+spec:
+  type: LoadBalancer
+  selector:
+    app: hello-server
+  ports:
+    - protocol: TCP
+      port: 80
+      targetPort: 8080

porch/config/samples/apps/hello-server/k8s/svc.yaml

@@ -0,0 +1,45 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"os"
+)
+
+func main() {
+	if err := run(context.Background()); err != nil {
+		fmt.Fprintf(os.Stderr, "%v\n", err)
+		os.Exit(1)
+	}
+}
+
+func run(ctx context.Context) error {
+	http.HandleFunc("/", HelloHandler)
+
+	listen := ":8080"
+	if err := http.ListenAndServe(listen, nil); err != nil {
+		return fmt.Errorf("error listening on %q: %w", listen, err)
+	}
+
+	// This is documented not to happen
+	return fmt.Errorf("error:: ListenAndServe returned nil error")
+}
+
+func HelloHandler(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprintf(w, "Hello world\n")
+}