From 0600681f04e3818282a2d518ec3e6afee85f7978 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Tue, 29 Sep 2015 13:06:28 +0200
Subject: [PATCH] core: add a "Requires=" dependency between units and the
 slices they are located in

We place the processes we fork off in the cgroup anyway, and we probably
shouldn't be able to get that far if we couldn't set up the slice due to
resource problems or unmet conditions. Hence upgrade the dependency
between units and the slices they are located in from Wants= to
Requires=.

(cherry picked from commit 8c8da0e0cb498245c765732cf9caa081a70c560f)

Related: #1718953
---
 src/core/unit.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/core/unit.c b/src/core/unit.c
index 37fac8db3a..1dff541ac3 100644
--- a/src/core/unit.c
+++ b/src/core/unit.c
@@ -1113,12 +1113,12 @@ static int unit_add_slice_dependencies(Unit *u) {
                 return 0;
 
         if (UNIT_ISSET(u->slice))
-                return unit_add_two_dependencies(u, UNIT_AFTER, UNIT_WANTS, UNIT_DEREF(u->slice), true);
+                return unit_add_two_dependencies(u, UNIT_AFTER, UNIT_REQUIRES, UNIT_DEREF(u->slice), true);
 
-        if (streq(u->id, SPECIAL_ROOT_SLICE))
+        if (unit_has_name(u, SPECIAL_ROOT_SLICE))
                 return 0;
 
-        return unit_add_two_dependencies_by_name(u, UNIT_AFTER, UNIT_WANTS, SPECIAL_ROOT_SLICE, NULL, true);
+        return unit_add_two_dependencies_by_name(u, UNIT_AFTER, UNIT_REQUIRES, SPECIAL_ROOT_SLICE, NULL, true);
 }
 
 static int unit_add_mount_dependencies(Unit *u) {