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template.go
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template.go
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package main
import (
"io"
"log"
"os"
"text/template"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"sigs.k8s.io/yaml"
)
const (
panicSeparator = ": "
tmplPrefix = "([{"
tmplSuffix = "}])"
tmplOption = "missingkey=error"
)
type Template struct {
metav1.TypeMeta `json:",inline"`
metav1.ObjectMeta `json:"metadata,omitempty"`
Data map[string]interface{} `json:"data,omitempty"`
}
func main() {
filePath := os.Args[1]
data, err := os.ReadFile(filePath)
if err != nil {
log.Panic(filePath, panicSeparator, err)
}
if err := GenerateManifests(data, os.Stdout); err != nil {
log.Panic(filePath, panicSeparator, err)
}
}
func GenerateManifests(data []byte, out io.Writer) error {
var object Template
if err := yaml.Unmarshal(data, &object); err != nil {
return err
}
name := object.GetName()
tmpl, err := template.New(name).
Delims(tmplPrefix, tmplSuffix).
Option(tmplOption).
ParseFS(virtualFS{}, name)
if err != nil {
return err
}
return tmpl.Execute(out, object.Data)
}