From 10303903dc22ad1711df58556e7057ce59471b2e Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 24 Apr 2015 17:28:06 +0200
Subject: [PATCH] unit: don't add automatic dependencies on device units if
 they aren't supported

http://lists.freedesktop.org/archives/systemd-devel/2015-April/031187.html
(cherry picked from commit 47bc12e1ba35d38edda737dae232088d6d3ae688)
---
 src/core/unit.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/core/unit.c b/src/core/unit.c
index 565455bd63..b9e1f13eaf 100644
--- a/src/core/unit.c
+++ b/src/core/unit.c
@@ -2830,14 +2830,18 @@ int unit_add_node_link(Unit *u, const char *what, bool wants) {
 
         assert(u);
 
-        if (!what)
-                return 0;
-
         /* Adds in links to the device node that this unit is based on */
+        if (isempty(what))
+                return 0;
 
         if (!is_device_path(what))
                 return 0;
 
+        /* When device units aren't supported (such as in a
+         * container), don't create dependencies on them. */
+        if (unit_vtable[UNIT_DEVICE]->supported && !unit_vtable[UNIT_DEVICE]->supported(u->manager))
+                return 0;
+
         e = unit_name_from_path(what, ".device");
         if (!e)
                 return -ENOMEM;