systemd: add "RuntimeDirectory" directive

NEWS

@@ -5,6 +5,7 @@ ver 0.23.3 (not yet released)
 * output
   - alsa: add option "stop_dsd_silence" to work around DSD DAC noise
 * macOS: fix libfmt related build failure
+* systemd: add "RuntimeDirectory" directive
 
 ver 0.23.2 (2021/10/22)
 * protocol

systemd/system/mpd.service.in

@@ -7,6 +7,10 @@ After=network.target sound.target
 Type=notify
 ExecStart=@prefix@/bin/mpd --no-daemon
 
+# Create /run/mpd (if MPD is launched without the socket unit and is
+# configured to bind listener sockets there).
+RuntimeDirectory=mpd
+
 # Enable this setting to ask systemd to watch over MPD, see
 # systemd.service(5).  This is disabled by default because it causes
 # periodic wakeups which are unnecessary if MPD is not playing.

systemd/user/mpd.service.in

@@ -7,6 +7,10 @@ After=network.target sound.target
 Type=notify
 ExecStart=@prefix@/bin/mpd --no-daemon
 
+# Create /run/user/$UID/mpd (if MPD is launched without the socket
+# unit and is configured to bind listener sockets there).
+RuntimeDirectory=mpd
+
 # Enable this setting to ask systemd to watch over MPD, see
 # systemd.service(5).  This is disabled by default because it causes
 # periodic wakeups which are unnecessary if MPD is not playing.