From d8c0a8d2d6a86d1bce3ea287a9f5908df88e187c Mon Sep 17 00:00:00 2001
From: Todd E Johnson <todd@toddejohnson.net>
Date: Mon, 15 Jul 2019 20:45:24 -0500
Subject: [PATCH] Add nm-unmetered-connection checks

---
 .../system/nm-unmetered-connection.service       |  7 +++++++
 etc/systemd/system/restic-backup.service         |  3 ++-
 etc/systemd/system/restic-backup.timer           |  3 +--
 usr/local/sbin/nm-unmetered-connection.sh        | 16 ++++++++++++++++
 4 files changed, 26 insertions(+), 3 deletions(-)
 create mode 100644 etc/systemd/system/nm-unmetered-connection.service
 create mode 100644 usr/local/sbin/nm-unmetered-connection.sh

diff --git a/etc/systemd/system/nm-unmetered-connection.service b/etc/systemd/system/nm-unmetered-connection.service
new file mode 100644
index 0000000..e2ce521
--- /dev/null
+++ b/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
+
diff --git a/etc/systemd/system/restic-backup.service b/etc/systemd/system/restic-backup.service
index 060be03..d0d3108 100644
--- a/etc/systemd/system/restic-backup.service
+++ b/etc/systemd/system/restic-backup.service
@@ -1,10 +1,11 @@
 [Unit]
 Description=Backup with restic to Backblaze B2
 OnFailure=status-email-user@%n.service
+Requires=nm-unmetered-connection.service
 
 [Service]
 Type=simple
 Nice=10
 ExecStart=/usr/local/sbin/restic_backup.sh
 # $HOME or $XDG_CACHE_HOME must be set for restic to find /root/.cache/restic/
-Environment="HOME=/root"
\ No newline at end of file
+Environment="HOME=/root"
diff --git a/etc/systemd/system/restic-backup.timer b/etc/systemd/system/restic-backup.timer
index d2fb57d..2e681ee 100644
--- a/etc/systemd/system/restic-backup.timer
+++ b/etc/systemd/system/restic-backup.timer
@@ -1,7 +1,6 @@
 [Unit]
 Description=Backup with restic on schedule
-Requires=unmetered-connection.service
-After=unmetered-connection.service
+Requires=nm-unmetered-connection.service
 
 [Timer]
 OnCalendar=daily
diff --git a/usr/local/sbin/nm-unmetered-connection.sh b/usr/local/sbin/nm-unmetered-connection.sh
new file mode 100644
index 0000000..aa68fd0
--- /dev/null
+++ b/usr/local/sbin/nm-unmetered-connection.sh
@@ -0,0 +1,16 @@
+#!/bin/bash
+
+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
+