Merge pull request #17 from toddejohnson/16-metered-net

Add requires to unmetered-connection.service

etc/systemd/system/nm-unmetered-connection.service

@@ -0,0 +1,7 @@
+[Unit]
+Description=Check if the current NetworkManager connection is metered
+
+[Service]
+Type=oneshot
+ExecStart=/usr/local/sbin/nm-unmetered-connection.sh
+

etc/systemd/system/restic-backup.service

@@ -1,6 +1,7 @@
 [Unit]
 Description=Backup with restic to Backblaze B2
 OnFailure=status-email-user@%n.service
+Requires=nm-unmetered-connection.service
 
 [Service]
 Type=simple

etc/systemd/system/restic-backup.timer

@@ -1,5 +1,6 @@
 [Unit]
 Description=Backup with restic on schedule
+Requires=nm-unmetered-connection.service
 
 [Timer]
 OnCalendar=daily

etc/systemd/system/restic-check.service

@@ -2,6 +2,7 @@
 Description=Check restic backup Backblaze B2 for errors
 OnFailure=status-email-user@%n.service
 Conflicts=restic.service
+Requires=nm-unmetered-connection.service
 
 [Service]
 Type=simple

etc/systemd/system/restic-check.timer

@@ -1,5 +1,6 @@
 [Unit]
 Description=Check restic backup Backblaze B2 for errors on a schedule
+Requires=nm-unmetered-connection.service
 
 [Timer]
 OnCalendar=monthly

usr/local/sbin/nm-unmetered-connection.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+systemctl is-active dbus.service >/dev/null 2>&1 || exit 0
+systemctl is-active NetworkManager.service >/dev/null 2>&1 || exit 0
+
+metered_status=$(dbus-send --system --print-reply=literal \
+       	--system --dest=org.freedesktop.NetworkManager \
+	      /org/freedesktop/NetworkManager \
+	      org.freedesktop.DBus.Properties.Get \
+	      string:org.freedesktop.NetworkManager string:Metered \
+	      | grep -o ".$")
+
+if [[ $metered_status =~ (1|3) ]]; then
+  echo Current connection is metered
+  exit 1
+else 
+  exit 0
+fi
+