Switch updater to systemd system service (#72)

This makes the systemd system service a user service. There are two
reasons that motivated this change. First, user services require an
active session of the specified user. This has the drawback that the
updater would not be triggered after reboots if no SSH connection to the
GitHub Enterprise appliance was made. Second, user services cannot
depend on system services. Because of that, the updater service could
not reliably wait for the rest of GitHub Enterprise to start.

Author: pluehne

updater/README.md

@@ -34,12 +34,12 @@ The updater may be run in two modes:
 1. Create a config file in `/opt/autodesk/hubble-enterprise/config.py` (based on `[config.py.example](config.py.example)`).
 1. Enable and start the **periodic** updater process (persistently, survives reboots):
 	```sh
-	systemctl --user enable hubble-enterprise.timer
-	systemctl --user start hubble-enterprise.timer
+	sudo systemctl enable hubble-enterprise.timer
+	sudo systemctl start hubble-enterprise.timer
 	```
 1. Optionally, you may **trigger** the updater process (just once):
 	```sh
-	systemctl --user start hubble-enterprise.service
+	sudo systemctl start hubble-enterprise.service
 	```
 
 #### Upgrading
@@ -54,14 +54,14 @@ The updater may be run in two modes:
 	```
 1. If the `systemd` files (the service or timer file) have changed, let systemd adapt to the changes:
 	```sh
-	systemctl --user daemon-reexec
+	sudo systemctl daemon-reexec
 	```
 
 #### Uninstallation
 
 1. Disable the **periodic** updater process:
 	```sh
-	systemctl --user disable hubble-enterprise.timer
+	sudo systemctl disable hubble-enterprise.timer
 	```
 1. Remove the package:
 	```sh
@@ -72,7 +72,7 @@ The updater may be run in two modes:
 
 The updater’s log is accessible as follows:
 ```sh
-journalctl -f --user-unit hubble-enterprise.service
+journalctl -fu hubble-enterprise.service
 ```
 
 #### Debian Packaging

updater/packaging/debian/templates/Makefile

@@ -2,7 +2,7 @@ all: # nothing to build
 
 PKGNAME = hubble-enterprise
 INSTALLDIR = $(DESTDIR)/opt/autodesk/$(PKGNAME)
-SYSTEMDDIR = $(DESTDIR)/home/admin/.local/share/systemd/user
+SYSTEMDDIR = $(DESTDIR)/usr/lib/systemd/system
 BASEDIR=../../../..
 
 install:

updater/systemd/hubble-enterprise.service

@@ -1,8 +1,14 @@
 [Unit]
 Description=Hubble Enterprise updater
-After=mysql.service
+Requires=github-enterprise.target
+After=github-enterprise.target
 
 [Service]
 Type=simple
 ExecStart=/usr/bin/python3 /opt/autodesk/hubble-enterprise/update-stats.py
 WorkingDirectory=/opt/autodesk/hubble-enterprise/
+User=admin
+Group=admin
+
+[Install]
+WantedBy=github-enterprise.target

updater/systemd/hubble-enterprise.timer

@@ -1,10 +1,11 @@
 [Unit]
 Description=Runs Hubble Enterprise updater periodically
+Requires=github-enterprise.target
+After=github-enterprise.target
 
 [Timer]
 OnCalendar=7:30
 Persistent=true
-Unit=hubble-enterprise.service
 
 [Install]
-WantedBy=default.target
+WantedBy=github-enterprise.target