do not mount binderfs if /dev/binder exists

Signed-off-by: Akihiro Suda <[email protected]>

src/anbox-container-manager.service

@@ -6,8 +6,8 @@ Wants=network.target
 [Service]
 ExecStartPre=/sbin/modprobe ashmem_linux
 ExecStartPre=/sbin/modprobe binder_linux
-ExecStartPre=mkdir -p /dev/binderfs
-ExecStartPre=mount -t binder none /dev/binderfs
+# newer kernel uses /dev/binderfs directory instead of /dev/binder file
+ExecStartPre=sh -exc "[ -f /dev/binder ] || (mkdir -p /dev/binderfs && mount -t binder none /dev/binderfs)"
 ExecStartPre=/usr/local/share/anbox/anbox-bridge.sh start
 ExecStart=/usr/local/bin/anbox container-manager --daemon --data-path=/var/lib/anbox --android-image=/android.img --use-rootfs-overlay
 ExecStopPost=/usr/local/share/anbox/anbox-bridge.sh stop