build: add yamlgen to build deployment files

This initial version of yamlgen generates deploy/scc.yaml based on the
deployment artifact that is provided by the new api/deploy/ocp package.

Signed-off-by: Niels de Vos <ndevos@redhat.com>

tools/Makefile

@@ -0,0 +1,17 @@
+# Copyright 2021 The Ceph-CSI Authors.
+#
+# 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.
+
+.PHONY: generate-deploy
+generate-deploy: yamlgen/main.go
+	go run yamlgen/main.go

tools/README.md

@@ -0,0 +1,8 @@
+# Assorted Tools for maintaining and building Ceph-CSI
+
+## `yamlgen`
+
+`yamlgen` reads deployment configurations from the `api/` package and generates
+YAML files that can be used for deploying without advanced automation like
+Rook. The generated files are located under `deploy/`.
+

tools/yamlgen/main.go

@@ -0,0 +1,83 @@
+/*
+Copyright 2021 The Ceph-CSI Authors.
+
+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 (
+	"fmt"
+	"os"
+
+	"github.com/ceph/ceph-csi/api/deploy/ocp"
+)
+
+const header = `---
+#
+# /!\ DO NOT MODIFY THIS FILE
+#
+# This file has been automatically generated by Ceph-CSI yamlgen.
+# The source for the contents can be found in the api/deploy directory, make
+# your modifications there.
+#
+`
+
+type deploymentArtifact struct {
+	filename string
+	// FIXME: This is not dynamic enough for additional YAML generating
+	// functions. Need to look into typecasting the functions and passing
+	// interface{} instead of ocp.SecurityContextConstraintsValues.
+	yamlFunc func(ocp.SecurityContextConstraintsValues) (string, error)
+	defaults ocp.SecurityContextConstraintsValues
+}
+
+var yamlArtifacts = []deploymentArtifact{
+	{
+		"../deploy/scc.yaml",
+		ocp.NewSecurityContextConstraintsYAML,
+		ocp.SecurityContextConstraintsDefaults,
+	},
+}
+
+func main() {
+	for _, artifact := range yamlArtifacts {
+		writeArtifact(artifact)
+	}
+}
+
+func writeArtifact(artifact deploymentArtifact) {
+	fmt.Printf("creating %q...", artifact.filename)
+
+	f, err := os.Create(artifact.filename)
+	if err != nil {
+		panic(fmt.Sprintf("failed to create file %q: %v", artifact.filename, err))
+	}
+
+	_, err = f.WriteString(header)
+	if err != nil {
+		panic(fmt.Sprintf("failed to write header to %q: %v", artifact.filename, err))
+	}
+
+	data, err := artifact.yamlFunc(artifact.defaults)
+	if err != nil {
+		panic(fmt.Sprintf("failed to generate YAML for %q: %v", artifact.filename, err))
+	}
+
+	_, err = f.WriteString(data)
+	if err != nil {
+		panic(fmt.Sprintf("failed to write contents to %q: %v", artifact.filename, err))
+	}
+
+	fmt.Println("done!")
+}