Include a systemd.service file to run as a user (#800)

Include a systemd.service file to run as a user

This new `systemd.service` file allows running and controlling the service as
an unpriviledged user (generally, as part of a user session).

Author: Hugo Osvaldo Barrera

Cargo.toml

@@ -90,5 +90,6 @@ section = "sound"
 priority = "optional"
 assets = [
     ["target/release/librespot", "usr/bin/", "755"],
-    ["contrib/librespot.service", "lib/systemd/system/", "644"]
+    ["contrib/librespot.service", "lib/systemd/system/", "644"],
+    ["contrib/librespot.user.service", "lib/systemd/user/", "644"]
 ]

README.md

@@ -89,6 +89,7 @@ The above command will create a receiver named ```Librespot```, with bitrate set
 A full list of runtime options are available [here](https://github.com/librespot-org/librespot/wiki/Options)
 
 _Please Note: When using the cache feature, an authentication blob is stored for your account in the cache directory. For security purposes, we recommend that you set directory permissions on the cache directory to `700`._
+
 ## Contact
 Come and hang out on gitter if you need help or want to offer some.
 https://gitter.im/librespot-org/spotify-connect-resources

contrib/librespot.service

@@ -1,5 +1,7 @@
 [Unit]
-Description=Librespot
+Description=Librespot (an open source Spotify client)
+Documentation=https://github.com/librespot-org/librespot
+Documentation=https://github.com/librespot-org/librespot/wiki/Options
 Requires=network-online.target
 After=network-online.target
 
@@ -8,8 +10,7 @@ User=nobody
 Group=audio
 Restart=always
 RestartSec=10
-ExecStart=/usr/bin/librespot -n "%p on %H"
+ExecStart=/usr/bin/librespot --name "%p@%H"
 
 [Install]
 WantedBy=multi-user.target
-

contrib/librespot.user.service

@@ -0,0 +1,12 @@
+[Unit]
+Description=Librespot (an open source Spotify client)
+Documentation=https://github.com/librespot-org/librespot
+Documentation=https://github.com/librespot-org/librespot/wiki/Options
+
+[Service]
+Restart=always
+RestartSec=10
+ExecStart=/usr/bin/librespot --name "%u@%H"
+
+[Install]
+WantedBy=default.target