Add CopyOf utility method

Add a utility method that returns a copy of a slice of strings.
This is primarily useful when appending to a string slice to avoid
accidentally reusing the backing array.

Test: util_test.go
Change-Id: I7801fc7ca19e27ddc9f1b1b452788b723c7f619c

1 files changed, 5 insertions, 0 deletions

diff --git a/android/util.go b/android/util.go
index 92ab845ba..8fc159dc8 100644
--- a/android/util.go
+++ b/android/util.go
@@ -20,6 +20,11 @@ import (
 	"strings"
 )
 
+// CopyOf returns a new slice that has the same contents as s.
+func CopyOf(s []string) []string {
+	return append([]string(nil), s...)
+}
+
 func JoinWithPrefix(strs []string, prefix string) string {
 	if len(strs) == 0 {
 		return ""