Issue #247 Ensure systemd-journal-gatewayd socket is correct (#277)

* Create systemd socket override for systemd-journal-gatewayd

As stated in #247 the default action for systemd-journal-gatewayd is to listen on HTTP port while Supervisor needs Unix socket file that's bind mounted in Docker container. This override changes socket location.

* Check and fix systemd socket file

As stated in #247 with the default setup the path /run/systemd-journal-gatewayd.sock may be a directory, not a file, we have to fix that

* Remove unnecessary unit file

Socket location change has been moved to systemd override which is the suggested way of changing original packaged unit behavior

* Rename hassio-supervisor.conf to 10-hassio-supervisor.conf

Author: p0wertiger

homeassistant-supervised/DEBIAN/postinst

@@ -31,6 +31,14 @@ if [ "$(systemctl is-active systemd-resolved)" = 'inactive' ]; then
     systemctl start systemd-resolved.service> /dev/null 2>&1;
 fi
 
+# Check and fix systemd-journal-gatewayd socket location
+if [ ! -S "/run/systemd-journal-gatewayd.sock" ]; then
+    info "Set up systemd-journal-gatewayd socket file"
+    if [ "$(systemctl is-active systemd-journal-gatewayd.socket)" = 'active' ]; then
+        systemctl stop systemd-journal-gatewayd.socket> /dev/null 2>&1;
+    fi
+    rm -rf "/run/systemd-journal-gatewayd.sock";
+fi
 # Enable and start systemd-journal-gatewayd
 if [ "$(systemctl is-active systemd-journal-gatewayd.socket)" = 'inactive' ]; then
     info "Enable systemd-journal-gatewayd"

homeassistant-supervised/etc/systemd/system/systemd-journal-gatewayd.socket.d/10-hassio-supervisor.conf

@@ -0,0 +1,3 @@
+[Socket]
+ListenStream=
+ListenStream=/run/systemd-journal-gatewayd.sock