Fix create volume /etc cover /etc/{hosts,resolv.conf,hostname}

Signed-off-by: Lei Jitang <leijitang@huawei.com>

daemon/volumes.go

@@ -316,8 +316,23 @@ func validMountMode(mode string) bool {
 }
 
 func (container *Container) setupMounts() error {
-	mounts := []execdriver.Mount{
-		{Source: container.ResolvConfPath, Destination: "/etc/resolv.conf", Writable: true, Private: true},
+	mounts := []execdriver.Mount{}
+
+	// Mount user specified volumes
+	// Note, these are not private because you may want propagation of (un)mounts from host
+	// volumes. For instance if you use -v /usr:/usr and the host later mounts /usr/share you
+	// want this new mount in the container
+	// These mounts must be ordered based on the length of the path that it is being mounted to (lexicographic)
+	for _, path := range container.sortedVolumeMounts() {
+		mounts = append(mounts, execdriver.Mount{
+			Source:      container.Volumes[path],
+			Destination: path,
+			Writable:    container.VolumesRW[path],
+		})
+	}
+
+	if container.ResolvConfPath != "" {
+		mounts = append(mounts, execdriver.Mount{Source: container.ResolvConfPath, Destination: "/etc/resolv.conf", Writable: true, Private: true})
 	}
 
 	if container.HostnamePath != "" {
@@ -334,19 +349,6 @@ func (container *Container) setupMounts() error {
 		}
 	}
 
-	// Mount user specified volumes
-	// Note, these are not private because you may want propagation of (un)mounts from host
-	// volumes. For instance if you use -v /usr:/usr and the host later mounts /usr/share you
-	// want this new mount in the container
-	// These mounts must be ordered based on the length of the path that it is being mounted to (lexicographic)
-	for _, path := range container.sortedVolumeMounts() {
-		mounts = append(mounts, execdriver.Mount{
-			Source:      container.Volumes[path],
-			Destination: path,
-			Writable:    container.VolumesRW[path],
-		})
-	}
-
 	container.command.Mounts = mounts
 	return nil
 }