File dont_overwrite_ifcfg.patch of Package google-guest-agent.18997

commit 4000e2ceeaf2f7b1c6428bde88b619a3a56acdfd
Author: Joachim Gleissner <jgleissner@suse.com>
Date:   Thu Oct 15 17:23:34 2020 +0100

    do not overwrite ifcfg files on SLES

diff --git a/google_guest_agent/addresses.go b/google_guest_agent/addresses.go
index 6326ff2..3080142 100644
--- a/google_guest_agent/addresses.go
+++ b/google_guest_agent/addresses.go
@@ -534,7 +534,12 @@ func enableSLESInterfaces(interfaces []string) error {
 	var priority = 10100
 	for _, iface := range interfaces {
 		var ifcfg *os.File
-		ifcfg, err = os.Create("/etc/sysconfig/network/ifcfg-" + iface)
+		filename := "/etc/sysconfig/network/ifcfg-" + iface
+		_, err = os.Stat(filename)
+		if ! os.IsNotExist(err) {
+			return nil
+		}
+		ifcfg, err = os.Create(filename)
 		if err != nil {
 			return err
 		}