From c978ca0d263e09d78677b68c1ff769b8e406b369 Mon Sep 17 00:00:00 2001
From: Antonio Ojea <antonio.ojea.garcia@gmail.com>
Date: Mon, 6 Apr 2020 18:35:33 +0200
Subject: [PATCH] Support BTRFS and ZFS docker storage

It seems that mounting /dev/mapper from the host to the kind
nodes remove the limitation on Docker of using BTRFS or ZFS

https://kind.sigs.k8s.io/docs/user/known-issues/#docker-on-btrfs-or-zfs
---
 .../internal/providers/docker/provision.go    | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/pkg/cluster/internal/providers/docker/provision.go b/pkg/cluster/internal/providers/docker/provision.go
index e769fd8a45..bf2a5ad47c 100644
--- a/pkg/cluster/internal/providers/docker/provision.go
+++ b/pkg/cluster/internal/providers/docker/provision.go
@@ -164,9 +164,32 @@ func commonArgs(cluster string, cfg *config.Cluster) ([]string, error) {
 	if usernsRemap() {
 		args = append(args, "--userns=host")
 	}
+
+	// handle Docker on Btrfs or ZFS
+	dockerStorage, err := getDockerStorage()
+	if err != nil {
+		return nil, errors.Wrap(err, "can't get Docker Storage")
+	}
+	if dockerStorage == "btrfs" || dockerStorage == "zfs" {
+		args = append(args, "--volume", "/dev/mapper", "/dev/mapper")
+	}
+
 	return args, nil
 }
 
+// get docker Storage Driver
+func getDockerStorage() (string, error) {
+	cmd := exec.Command("docker", "info", "-f", "{{.Driver}}")
+	lines, err := exec.CombinedOutputLines(cmd)
+	if err != nil {
+		return "", errors.Wrap(err, "failed to get storage")
+	}
+	if len(lines) != 1 {
+		return "", errors.Errorf("docker info should return one line, got %d lines", len(lines))
+	}
+	return strings.ToLower(strings.TrimSpace(lines[0])), nil
+}
+
 func runArgsForNode(node *config.Node, clusterIPFamily config.ClusterIPFamily, name string, args []string) ([]string, error) {
 	args = append([]string{
 		"run",