chore(kontemplate): Prepare kontemplate for depot-merge

This merge will not yet include moving over to buildGo.nix, as support
for testing and such is not present in that library yet.

1 files changed, 58 insertions, 0 deletions

diff --git a/ops/kontemplate/util/util.go b/ops/kontemplate/util/util.go
new file mode 100644
index 000000000000..56fa1e3fc9c5
--- /dev/null
+++ b/ops/kontemplate/util/util.go
@@ -0,0 +1,58 @@
+// Copyright (C) 2016-2019  Vincent Ambo <mail@tazj.in>
+//
+// This file is part of Kontemplate.
+//
+// Kontemplate is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+package util
+
+import (
+	"io/ioutil"
+
+	"github.com/ghodss/yaml"
+)
+
+// Filenames excluded from templating for the purpose of containing default variable values inside a resource set.
+var DefaultFilenames []string = []string{"default.yml", "default.yaml", "default.json"}
+
+// Merges two maps together. Values from the second map override values in the first map.
+// The returned map is new if anything was changed.
+func Merge(in1 *map[string]interface{}, in2 *map[string]interface{}) *map[string]interface{} {
+	if in1 == nil || len(*in1) == 0 {
+		return in2
+	}
+
+	if in2 == nil || len(*in2) == 0 {
+		return in1
+	}
+
+	new := make(map[string]interface{})
+	for k, v := range *in1 {
+		new[k] = v
+	}
+
+	for k, v := range *in2 {
+		new[k] = v
+	}
+
+	return &new
+}
+
+// Loads either a YAML or JSON file from the specified path and
+// deserialises it into the provided interface.
+func LoadData(filename string, addr interface{}) error {
+	file, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return err
+	}
+
+	err = yaml.Unmarshal(file, addr)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}