Added improved auto-update support. (#9966)

* Add systemd timer unit to handle auto updates.

This adds a systemd timer unit and associated service for running the
updaterscript. This allows better support for auto-updates on systems
that use systemd, removing the need for cron or special shims to handle
periodic tasks.

This will be used in preference to our existing auto-update support on
systems running systemd unless the user overrides this behavior.

* Add an option to the installer to override auto-updater type detection.

This allows users to specify what auto-updater scheduling mechanism to
use. This wil persist the selection to updates as well.

Supported values are:

* systemd': Uses a systemd timer unit and service to handle automatic
  updates.
* 'interval': Uses a script in /etc/cron.daily or /etc/periodic/daily.
* `crontab`: Uses a crontab file in /etc/cron.d.

* Change priority of systemd support.

This way existing users won't get converted, and by default you'll still
get emails on failures.

* Case-normalize the value passed to --auto-update-type.

* Fix incorrect naming of crontab file.

* Fixed function naming.

1 files changed, 12 insertions, 0 deletions

diff --git a/system/netdata-updater.timer b/system/netdata-updater.timer
new file mode 100644
index 0000000000..8b36e46ff4
--- /dev/null
+++ b/system/netdata-updater.timer
@@ -0,0 +1,12 @@
+[Unit]
+Description=Daily auto-updates for Netdata
+RefuseManualStart=no
+RefuseManualStop=no
+
+[Timer]
+Persistent=false
+OnCalendar=daily
+Unit=netdata-updater.service
+
+[Install]
+WantedBy=timers.target