Beginning to make library updates for node specific overlays

internal/pkg/util/util.go

@@ -1,16 +1,41 @@
 
 package util
 
-
 import (
+    "bufio"
     "fmt"
-    "crypto/sha1"
+    "os"
+    "strings"
 )
 
+func FileCopyReplace(sourceFile string, destFile string, replace map[string]string) error{
 
+    sourceFD, err := os.Open(sourceFile)
+    if err != nil {
+        return err
+    }
 
-func Sha1Sum(input string) []byte{
+    destFD, err := os.Create(destFile)
+    if err != nil {
+        return err
+    }
+    defer sourceFD.Close()
+    defer destFD.Close()
 
+    scanner := bufio.NewScanner(sourceFD)
+    w := bufio.NewWriter(destFD)
 
+    for scanner.Scan() {
+        newLine := scanner.Text()
+        for k, v := range replace {
+            replaceString := fmt.Sprintf("@{%s}", strings.ToUpper(k))
+            newLine = strings.Replace(newLine, replaceString, v, -1)
 
+        }
+        w.WriteString(newLine + "\n")
+
+    }
+
+    return w.Flush()
 }
+