From 9090b94294927bb3d8b082323e1e687ae920703a Mon Sep 17 00:00:00 2001
From: Valentin Tjoncke <valtjo@gmail.com>
Date: Tue, 20 Mar 2018 23:38:26 +0100
Subject: [PATCH] Fix #5

---
 helm-gcs/gcs/gcs.go   |  5 +++++
 helm-gcs/repo/repo.go | 11 +++++++++++
 2 files changed, 16 insertions(+)

diff --git a/helm-gcs/gcs/gcs.go b/helm-gcs/gcs/gcs.go
index 1ae973df..ee84b2e6 100644
--- a/helm-gcs/gcs/gcs.go
+++ b/helm-gcs/gcs/gcs.go
@@ -10,6 +10,8 @@ import (
 	"cloud.google.com/go/storage"
 )
 
+var ErrObjectNotExist = errors.New("gcs: " + storage.ErrObjectNotExist.Error())
+
 func NewWriter(url string) (io.WriteCloser, error) {
 	makeError := makeErrorFunc("gcs.NewWriter")
 	bucket, fullname, err := splitURL(url)
@@ -43,6 +45,9 @@ func NewReader(url string) (io.ReadCloser, error) {
 	o := b.Object(fullname[1:])
 	r, err := o.NewReader(ctx)
 	if err != nil {
+		if err == storage.ErrObjectNotExist {
+			return nil, ErrObjectNotExist
+		}
 		return nil, makeError(err)
 	}
 	return r, nil
diff --git a/helm-gcs/repo/repo.go b/helm-gcs/repo/repo.go
index 1c9d4de2..d1ae23ce 100644
--- a/helm-gcs/repo/repo.go
+++ b/helm-gcs/repo/repo.go
@@ -50,6 +50,17 @@ func CreateRepo(path string) error {
 	if err != nil {
 		return makeError(err)
 	}
+	// Do not rewrite index.yaml if it already exists
+	_, err = gcs.NewReader(indexFileURL)
+	if err != nil {
+		if err != gcs.ErrObjectNotExist {
+			return makeError(err)
+		}
+	} else {
+		debug("repository already initialized")
+		return nil
+	}
+	// Create index.yaml
 	w, err := gcs.NewWriter(indexFileURL)
 	if err != nil {
 		return makeError(err)