From 79f0e70ce8dbb43e1baae628ac703108642774bc Mon Sep 17 00:00:00 2001
From: KUOKA Yusuke <ykuoka@gmail.com>
Date: Thu, 30 Aug 2018 17:20:38 +0900
Subject: [PATCH] fix: avoid "cross-device link" errors while decrypting
 secrets (#260)

ref https://github.com/roboll/helmfile/issues/251#issuecomment-417166296
---
 helmexec/exec.go | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/helmexec/exec.go b/helmexec/exec.go
index 9bd03d8a..4039e3f6 100644
--- a/helmexec/exec.go
+++ b/helmexec/exec.go
@@ -115,9 +115,18 @@ func (helm *execer) DecryptSecret(name string) (string, error) {
 	if err != nil {
 		return "", err
 	}
-	tmpFile.Close()
+	defer tmpFile.Close()
 
-	err = os.Rename(name+".dec", tmpFile.Name())
+	// os.Rename seems to results in "cross-device link` errors in some cases
+	// Instead of moving, copy it to the destination temp file as a work-around
+	// See https://github.com/roboll/helmfile/issues/251#issuecomment-417166296
+	decFile, err := os.Open(name + ".dec")
+	if err != nil {
+		return "", err
+	}
+	defer decFile.Close()
+
+	_, err = io.Copy(tmpFile, decFile)
 	if err != nil {
 		return "", err
 	}