From c848f59a555238652ed6260bb3af5d0ec2b05a1e Mon Sep 17 00:00:00 2001
From: Daisuke Takahashi <daisuke_takahashi_xa@cyberagent.co.jp>
Date: Thu, 20 Sep 2018 10:24:39 +0900
Subject: [PATCH] Check condition for image_disk_format option

---
 builder/openstack/builder.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/builder/openstack/builder.go b/builder/openstack/builder.go
index 7aba1d432..441636ae2 100644
--- a/builder/openstack/builder.go
+++ b/builder/openstack/builder.go
@@ -52,6 +52,10 @@ func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 		return nil, errs
 	}
 
+	if b.config.ImageConfig.ImageDiskFormat != "" && !b.config.RunConfig.UseBlockStorageVolume {
+		return nil, fmt.Errorf("use_blockstorage_volume must be true if image_disk_format is specified.")
+	}
+
 	// By default, instance name is same as image name
 	if b.config.InstanceName == "" {
 		b.config.InstanceName = b.config.ImageName