From eeb1542b5ed4e195bf76996493288db489f32a0f Mon Sep 17 00:00:00 2001
From: =?utf8?q?Giedrius=20Statkevi=C4=8Dius?= <giedriuswork@gmail.com>
Date: Sun, 22 Mar 2020 15:49:55 +0200
Subject: [PATCH] systemctl: exit with 1 if no unit files found

Add a simple check on the number of unit files that were found: return
`-ENOENT` when none is found from the function and thus `systemctl`
consequently exits with `1` (`EXIT_FAILURE`) if none were found.

Verification:
```bash
root@image:~# systemctl list-unit-files dbus-nonexistant.service; echo
$?
UNIT FILE STATE VENDOR PRESET

0 unit files listed.
1
root@image:~# systemctl list-unit-files dbus.service; echo $?
UNIT FILE    STATE  VENDOR PRESET
dbus.service static enabled

1 unit files listed.
0
```

Fixes #15082.
---
 src/systemctl/systemctl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/systemctl/systemctl.c b/src/systemctl/systemctl.c
index f8b0adc3347..58b0fd3688a 100644
--- a/src/systemctl/systemctl.c
+++ b/src/systemctl/systemctl.c
@@ -1659,6 +1659,9 @@ static int list_unit_files(int argc, char *argv[], void *userdata) {
                 for (unit = units; unit < units + c; unit++)
                         free(unit->path);
 
+        if (c == 0)
+                return -ENOENT;
+
         return 0;
 }
 
-- 
2.47.3