From 90c0dc446632c7b5b2ed6251e0ce94c714b5a180 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Sat, 20 May 2017 19:34:50 -0400
Subject: [PATCH] core/load-droping: avoid oom warning when the unit symlink is
 not a template

unit_name_template returns -EINVAL if the unit name is not a template, but
the code assumed that OOM is the only failure mode. Fix that to emit the warning
if a non-template unit is encountered (because in this case we expect the name
to match exactly), and just skip the warning on other errors (presumably oom).

Fixes #5543.

(cherry picked from commit e450032f0990067c0076068774162265db99d22c)
---
 src/core/load-dropin.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/core/load-dropin.c b/src/core/load-dropin.c
index ff3636149a..3180f911bb 100644
--- a/src/core/load-dropin.c
+++ b/src/core/load-dropin.c
@@ -38,10 +38,12 @@ static bool unit_name_compatible(const char *a, const char *b) {
                 return true;
 
         r = unit_name_template(a, &prefix);
-        if (r < 0) {
-                log_oom();
+        if (r == -EINVAL)
+                /* not a template */
+                return false;
+        if (r < 0)
+                /* oom, or some other failure. Just skip the warning. */
                 return true;
-        }
 
         /* an instance name points to a target that is just the template name */
         if (streq(prefix, b))