internal/osbuild: add ovf stage

internal/osbuild/ovf_stage.go

@@ -0,0 +1,39 @@
+package osbuild
+
+import (
+	"fmt"
+	"regexp"
+)
+
+const vmdkRegex = "^[a-zA-Z0-9+_.-]*$"
+
+type OVFStageOptions struct {
+	Vmdk string `json:"vmdk"`
+}
+
+func (OVFStageOptions) isStageOptions() {}
+
+func (o OVFStageOptions) validate() error {
+	if o.Vmdk == "" {
+		return fmt.Errorf("'vmdk' option is empty")
+	}
+
+	exp := regexp.MustCompile(vmdkRegex)
+	if !exp.MatchString(o.Vmdk) {
+		return fmt.Errorf("'vmdk' name %q doesn't conform to schema (%s)", o.Vmdk, exp.String())
+	}
+
+	return nil
+}
+
+// Generates a file descriptor for an in-tree vmdk file
+func NewOVFStage(options *OVFStageOptions) *Stage {
+	if err := options.validate(); err != nil {
+		panic(err)
+	}
+
+	return &Stage{
+		Type:    "org.osbuild.ovf",
+		Options: options,
+	}
+}