From ecea7a949f5029577d0c75c96d2cf8bc03d5938f Mon Sep 17 00:00:00 2001
From: Christian Goll <cgoll@suse.de>
Date: Wed, 8 Jun 2022 10:33:49 +0200
Subject: [PATCH] create symlink if target exists

---
 internal/pkg/overlay/overlay.go | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/internal/pkg/overlay/overlay.go b/internal/pkg/overlay/overlay.go
index 634b5082..df2b317e 100644
--- a/internal/pkg/overlay/overlay.go
+++ b/internal/pkg/overlay/overlay.go
@@ -417,12 +417,23 @@ func BuildOverlayIndir(nodeInfo node.NodeInfo, overlayNames []string, outputDir
 				if err != nil {
 					wwlog.ErrorExc(err, "")
 				}
+				if util.IsFile(path.Join(outputDir, location)) {
+					if !util.IsFile(path.Join(outputDir, location+".wwbackup")) {
+						wwlog.Debug("Target exists, creating backup file")
+						err = os.Rename(path.Join(outputDir, location), path.Join(outputDir, location+"wwbackup"))
+					} else {
+						wwlog.Debug("%s exists, keeping the backup file", path.Join(outputDir, location+".wwbackup"))
+						err = os.Remove(path.Join(outputDir, location))
+					}
+					if err != nil {
+						wwlog.ErrorExc(err, "")
+					}
+				}
 				err = os.Symlink(destination, path.Join(outputDir, location))
 				if err != nil {
 					wwlog.ErrorExc(err, "")
 				}
 			} else {
-
 				err := util.CopyFile(location, path.Join(outputDir, location))
 				if err == nil {
 					wwlog.Debug("Copied file into overlay: %s", location)