From bf6615b0345d43b5c2c3234a1717dbe900950bfd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alexander=20Sch=C3=A4ferdiek?= <alexander@schaeferdiek.eu>
Date: Sun, 10 Jul 2022 18:29:44 +0200
Subject: [PATCH] Make scripts work for global user

---
 usr/local/bin/check_updates          | 52 +++++++++++++--------
 usr/local/bin/disk_space_alert       | 52 +++++++++++++--------
 usr/local/bin/docker_check           | 68 +++++++++++++++++++---------
 usr/local/bin/docker_compose_update  | 54 ++++++++++++++--------
 usr/local/bin/dynv6                  | 37 +++++++++++----
 usr/local/bin/memory_usage_alert     | 53 ++++++++++++++--------
 usr/local/bin/smartctl_tests_long    | 52 +++++++++++++--------
 usr/local/bin/systemd_check          | 68 +++++++++++++++++++---------
 usr/local/bin/systemd_failure_notify | 52 +++++++++++++--------
 9 files changed, 326 insertions(+), 162 deletions(-)
 mode change 100644 => 100755 usr/local/bin/dynv6

diff --git a/usr/local/bin/check_updates b/usr/local/bin/check_updates
index fedd88d..210c4ee 100755
--- a/usr/local/bin/check_updates
+++ b/usr/local/bin/check_updates
@@ -5,7 +5,7 @@ usage() {
 USAGE=$(cat <<EOF
 Usage: check_updates [CONFIG_FILE (absolute path)]
 
-If no CONFIG_FILE is given, HOME/.check_updates.conf is used. This fallback option
+If no CONFIG_FILE is given, HOME/.check_updates.conf or /etc/check_updates.conf is used. This fallback option
 has to exist or the script will exit.
 
 Configuration can be done in any file and any pre-defined variable can be overwritten.
@@ -27,26 +27,42 @@ UPDATES_AMOUNT=$(/usr/bin/checkupdates|wc -l)
 CHECK_UPDATES_MAIL_ADDRESS="";
 
 # check for config file
-source_config() {
-	local config=$1;
-	local configFallback=$2;
+apply_config() {
+  local config=$1;
 
-	if [[ ! -f "$config" ]]; then
-		if [[ ! -f "$configFallback" ]]; then
-			echo "No config file specified and could not find default in '$configFallback'!";
-			echo "";
-			usage;
-			exit 1;
-		else
-			config=$configFallback;
-		fi
-	fi
+  if [[ ! -f "$config" ]]; then
+      echo "No config file specified";
+      echo "";
+      usage;
+      exit 1;
+  fi
 
-	set -a;
-	source "$config";
-	set +a;
+  set -a;
+  source "$config";
+  set +a;
 }
-source_config "$1" "$HOME/.check_updates.conf"
+
+source_config() {
+  local config=$1;
+  local configFallback=$2;
+  local configGlobalFallback=$3;
+
+  if [[ -f "$config" ]]; then
+    apply_config "$config";
+    exit 0;
+  fi
+
+  if [[ -f "$configFallback" ]]; then
+    apply_config "$configFallback";
+    exit 0;
+  fi
+
+  if [[ -f "$configGlobalFallback" ]]; then
+    apply_config "$configGlobalFallback";
+    exit 0;
+  fi
+}
+source_config "$1" "$HOME/.check_updates.conf" "/etc/check_updates.conf"
 
 if [ "$UPDATES_AMOUNT" -gt "0" ]; then
 	mailx -s "[updates $HOSTNAME]" $CHECK_UPDATES_MAIL_ADDRESS << EOF
diff --git a/usr/local/bin/disk_space_alert b/usr/local/bin/disk_space_alert
index 7736300..a5d2b3e 100755
--- a/usr/local/bin/disk_space_alert
+++ b/usr/local/bin/disk_space_alert
@@ -5,7 +5,7 @@ usage() {
 USAGE=$(cat <<EOF
 Usage: disk_space_alert [CONFIG_FILE (absolute path)]
 
-If no CONFIG_FILE is given, HOME/.disk_space_alert.conf is used. This fallback option
+If no CONFIG_FILE is given, HOME/.disk_space_alert.conf or /etc/disk_space_alert.conf is used. This fallback option
 has to exist or the script will exit.
 
 Configuration can be done in any file and any pre-defined variable can be overwritten.
@@ -31,26 +31,42 @@ DISK_SPACE_ALERT_THRESHOLD=93
 DISK_SPACE_ALERT_MOUNTPOINTS=("/")
 
 # check for config file
-source_config() {
-	local config=$1;
-	local configFallback=$2;
+apply_config() {
+  local config=$1;
 
-	if [[ ! -f "$config" ]]; then
-		if [[ ! -f "$configFallback" ]]; then
-			echo "No config file specified and could not find default in '$configFallback'!";
-			echo "";
-			usage;
-			exit 1;
-		else
-			config=$configFallback;
-		fi
-	fi
+  if [[ ! -f "$config" ]]; then
+      echo "No config file specified";
+      echo "";
+      usage;
+      exit 1;
+  fi
 
-	set -a;
-	source "$config";
-	set +a;
+  set -a;
+  source "$config";
+  set +a;
 }
-source_config "$1" "$HOME/.disk_space_alert.conf"
+
+source_config() {
+  local config=$1;
+  local configFallback=$2;
+  local configGlobalFallback=$3;
+
+  if [[ -f "$config" ]]; then
+    apply_config "$config";
+    exit 0;
+  fi
+
+  if [[ -f "$configFallback" ]]; then
+    apply_config "$configFallback";
+    exit 0;
+  fi
+
+  if [[ -f "$configGlobalFallback" ]]; then
+    apply_config "$configGlobalFallback";
+    exit 0;
+  fi
+}
+source_config "$1" "$HOME/.disk_space_alert.conf" "/etc/disk_space_alert.conf"
 
 for point in "${DISK_SPACE_ALERT_MOUNTPOINTS[@]}"
 do
diff --git a/usr/local/bin/docker_check b/usr/local/bin/docker_check
index a82e646..35bd467 100755
--- a/usr/local/bin/docker_check
+++ b/usr/local/bin/docker_check
@@ -5,7 +5,7 @@ usage() {
 USAGE=$(cat <<EOF
 Usage: docker_check [CONFIG_FILE (absolute path)]
 
-If no CONFIG_FILE is given, HOME/.docker_check.conf is used. This fallback option
+If no CONFIG_FILE is given, HOME/.docker_check.conf or /etc/docker_check.conf is used. This fallback option
 has to exist or the script will exit.
 
 Configuration can be done in any file and any pre-defined variable can be overwritten.
@@ -26,45 +26,69 @@ set -e;
 
 HOSTNAME=$(hostname)
 DOCKER_CHECK_LIST_FILE="$HOME/.docker_check.list"
+DOCKER_CHECK_GLOBAL_LIST_FILE="/etc/docker_check.list"
 DOCKER_CHECK_NOTIFY_LEVELS=("UNKNOWN" "WARNING" "CRITICAL")
 DOCKER_CHECK_MAIL_ENABLED=false
 DOCKER_CHECK_MAIL_ADDRESS=""
 CONTAINERS=()
 
 # check for config file
-source_config() {
-	local config=$1;
-	local configFallback=$2;
+apply_config() {
+  local config=$1;
 
-	if [[ ! -f "$config" ]]; then
-		if [[ ! -f "$configFallback" ]]; then
-			echo "No config file specified and could not find default in '$configFallback'!";
-			echo "";
-			usage;
-			exit 1;
-		else
-			config=$configFallback;
-		fi
-	fi
+  if [[ ! -f "$config" ]]; then
+      echo "No config file specified";
+      echo "";
+      usage;
+      exit 1;
+  fi
 
-	set -a;
-	source "$config";
-	set +a;
+  set -a;
+  source "$config";
+  set +a;
 }
-source_config "$1" "$HOME/.docker_check.conf"
 
-if [ ! -f $DOCKER_CHECK_LIST_FILE ]; then
-	echo "$DOCKER_CHECK_LIST_FILE doesn't exist. Add a file which holds one docker container per line.";
+source_config() {
+  local config=$1;
+  local configFallback=$2;
+  local configGlobalFallback=$3;
+
+  if [[ -f "$config" ]]; then
+    apply_config "$config";
+    exit 0;
+  fi
+
+  if [[ -f "$configFallback" ]]; then
+    apply_config "$configFallback";
+    exit 0;
+  fi
+
+  if [[ -f "$configGlobalFallback" ]]; then
+    apply_config "$configGlobalFallback";
+    exit 0;
+  fi
+}
+source_config "$1" "$HOME/.docker_check.conf" "/etc/docker_check.conf"
+
+listFileToUse=""
+if [[ -f "$DOCKER_CHECK_LIST_FILE" ]]; then
+	listFileToUse="$DOCKER_CHECK_LIST_FILE"
+else
+	listFileToUse="$DOCKER_CHECK_GLOBAL_LIST_FILE"
+fi
+
+if [[ ! -f $listFileToUse ]]; then
+	echo "$listFileToUse doesn't exist. Add a file which holds one systemd service or timer per line.";
 	echo "";
 	usage;
 	exit 1;
 fi
 
-echo "Scanning $DOCKER_CHECK_LIST_FILE for containers...";
+echo "Scanning $listFileToUse for containers...";
 while IFS='' read -r line || [[ -n "$line" ]]; do
     CONTAINERS+=("$line")
 	echo "-> Found $line";
-done < "$DOCKER_CHECK_LIST_FILE"
+done < "$listFileToUse"
 
 # check if current status is in array of DOCKER_CHECK_NOTIFY_LEVELS
 function shouldLog() {
diff --git a/usr/local/bin/docker_compose_update b/usr/local/bin/docker_compose_update
index cebd83a..3f2c565 100755
--- a/usr/local/bin/docker_compose_update
+++ b/usr/local/bin/docker_compose_update
@@ -5,7 +5,7 @@ usage() {
 USAGE=$(cat <<EOF
 Usage: docker_compose_update [CONFIG_FILE (absolute path)]
 
-If no CONFIG_FILE is given, HOME/.docker_compose_update.conf is used. This fallback option
+If no CONFIG_FILE is given, HOME/.docker_compose_update.conf or /etc/docker_compose_update.conf is used. This fallback option
 has to exist or the script will exit.
 
 Configuration can be done in any file and any pre-defined variable can be overwritten.
@@ -29,25 +29,42 @@ set -e;
 declare -A DOCKER_COMPOSE_UPDATE_COMMANDS;
 
 # check for config file
-source_config() {
-	local config=$1;
-	local configFallback=$2;
+apply_config() {
+  local config=$1;
 
-	if [[ ! -f "$config" ]]; then
-		if [[ ! -f "$configFallback" ]]; then
-			echo "No config file specified and could not find default in '$configFallback'!";
-			echo "";
-			usage;
-			exit 1;
-		else
-			config=$configFallback;
-		fi
-	fi
+  if [[ ! -f "$config" ]]; then
+      echo "No config file specified";
+      echo "";
+      usage;
+      exit 1;
+  fi
 
-	set -a;
-	source "$config";
-	set +a;
+  set -a;
+  source "$config";
+  set +a;
 }
+
+source_config() {
+  local config=$1;
+  local configFallback=$2;
+  local configGlobalFallback=$3;
+
+  if [[ -f "$config" ]]; then
+    apply_config "$config";
+    exit 0;
+  fi
+
+  if [[ -f "$configFallback" ]]; then
+    apply_config "$configFallback";
+    exit 0;
+  fi
+
+  if [[ -f "$configGlobalFallback" ]]; then
+    apply_config "$configGlobalFallback";
+    exit 0;
+  fi
+}
+
 apply_defaults() {
     [[ -z ${DOCKER_COMPOSE_UPDATE_IGNORES} ]] && DOCKER_COMPOSE_UPDATE_IGNORES=();
 	[[ -z ${DOCKER_COMPOSE_UPDATE_COMMAND} ]] && DOCKER_COMPOSE_UPDATE_COMMAND="docker-compose down; docker-compose pull; docker-compose up -d;"
@@ -67,7 +84,8 @@ check_required() {
 # check requirements
 CONFIG_FILE="$1";
 FALLBACK_CONFIG_FILE="${HOME}/.docker_compose_update.conf";
-source_config "${CONFIG_FILE}" "${FALLBACK_CONFIG_FILE}";
+FALLBACK_CONFIG_GLOBAL_FILE="/etc/docker_compose_update.conf";
+source_config "${CONFIG_FILE}" "${FALLBACK_CONFIG_FILE}" "${FALLBACK_CONFIG_GLOBAL_FILE}";
 apply_defaults;
 check_required;
 
diff --git a/usr/local/bin/dynv6 b/usr/local/bin/dynv6
old mode 100644
new mode 100755
index 0341356..d723373
--- a/usr/local/bin/dynv6
+++ b/usr/local/bin/dynv6
@@ -6,7 +6,7 @@ usage() {
 USAGE=$(cat <<EOF
 Usage: dynv6 [CONFIG_FILE (absolute path)]
 
-If no CONFIG_FILE is given, HOME/.dynv6.conf is used. This fallback option
+If no CONFIG_FILE is given, HOME/.dynv6.conf or /etc/dynv6.conf is used. This fallback option
 has to exist or the script will exit.
 
 Configuration can be done in any file and any pre-defined variable can be overwritten.
@@ -27,19 +27,14 @@ EOF
 }
 
 # check for config file
-source_config() {
+apply_config() {
   local config=$1;
-  local configFallback=$2;
 
   if [[ ! -f "$config" ]]; then
-    if [[ ! -f "$configFallback" ]]; then
-      echo "No config file specified and could not find default in '$configFallback'!";
+      echo "No config file specified";
       echo "";
       usage;
       exit 1;
-    else
-      config=$configFallback;
-    fi
   fi
 
   set -a;
@@ -47,6 +42,27 @@ source_config() {
   set +a;
 }
 
+source_config() {
+  local config=$1;
+  local configFallback=$2;
+  local configGlobalFallback=$3;
+
+  if [[ -f "$config" ]]; then
+    apply_config "$config";
+    exit 0;
+  fi
+
+  if [[ -f "$configFallback" ]]; then
+    apply_config "$configFallback";
+    exit 0;
+  fi
+
+  if [[ -f "$configGlobalFallback" ]]; then
+    apply_config "$configGlobalFallback";
+    exit 0;
+  fi
+}
+
 apply_defaults() {
   if [ -z ${DYNV6_MAIL_ENABLED} ]; then
     DYNV6_MAIL_ENABLED=false;
@@ -84,8 +100,9 @@ check_required() {
 
 # check requirements
 CONFIG_FILE="$1";
-FALLBACK_CONFIG_FILE="${HOME}/.dynv6.conf";
-source_config "${CONFIG_FILE}" "${FALLBACK_CONFIG_FILE}";
+FALLBACK_CONFIG_FILE="${HOME}/dynv6.conf";
+FALLBACK_CONFIG_GLOBAL_FILE="/etc/dynv6.conf";
+source_config "${CONFIG_FILE}" "${FALLBACK_CONFIG_FILE}" "${FALLBACK_CONFIG_GLOBAL_FILE}";
 apply_defaults;
 check_required;
 
diff --git a/usr/local/bin/memory_usage_alert b/usr/local/bin/memory_usage_alert
index 6ee3be0..30c7417 100755
--- a/usr/local/bin/memory_usage_alert
+++ b/usr/local/bin/memory_usage_alert
@@ -5,7 +5,7 @@ usage() {
 USAGE=$(cat <<EOF
 Usage: memory_usage_alert [CONFIG_FILE (absolute path)]
 
-If no CONFIG_FILE is given, HOME/.memory_usage_alert.conf is used. This fallback option
+If no CONFIG_FILE is given, HOME/.memory_usage_alert.conf or /etc/memory_usage_alert.conf is used. This fallback option
 has to exist or the script will exit.
 
 Configuration can be done in any file and any pre-defined variable can be overwritten.
@@ -30,26 +30,43 @@ MEMORY_USAGE_ALERT_MAIL_ADDRESS="";
 MEMORY_USAGE_ALERT_THRESHOLD=512;
 
 # check for config file
-source_config() {
-	local config=$1;
-	local configFallback=$2;
+apply_config() {
+  local config=$1;
 
-	if [[ ! -f "$config" ]]; then
-		if [[ ! -f "$configFallback" ]]; then
-			echo "No config file specified and could not find default in '$configFallback'!";
-			echo "";
-			usage;
-			exit 1;
-		else
-			config=$configFallback;
-		fi
-	fi
+  if [[ ! -f "$config" ]]; then
+      echo "No config file specified";
+      echo "";
+      usage;
+      exit 1;
+  fi
 
-	set -a;
-	source "$config";
-	set +a;
+  set -a;
+  source "$config";
+  set +a;
 }
-source_config "$1" "$HOME/.memory_usage_alert.conf"
+
+source_config() {
+  local config=$1;
+  local configFallback=$2;
+  local configGlobalFallback=$3;
+
+  if [[ -f "$config" ]]; then
+    apply_config "$config";
+    exit 0;
+  fi
+
+  if [[ -f "$configFallback" ]]; then
+    apply_config "$configFallback";
+    exit 0;
+  fi
+
+  if [[ -f "$configGlobalFallback" ]]; then
+    apply_config "$configGlobalFallback";
+    exit 0;
+  fi
+}
+
+source_config "$1" "$HOME/.memory_usage_alert.conf" "/etc/memory_usage_alert.conf"
 
 # DO NOT TOUCH BELOW
 total=$(free -mt | grep Total | awk '{print $2}')
diff --git a/usr/local/bin/smartctl_tests_long b/usr/local/bin/smartctl_tests_long
index d5ecf29..d6ca879 100755
--- a/usr/local/bin/smartctl_tests_long
+++ b/usr/local/bin/smartctl_tests_long
@@ -5,7 +5,7 @@ usage() {
 USAGE=$(cat <<EOF
 Usage: smartctl_tests_long [CONFIG_FILE (absolute path)]
 
-If no CONFIG_FILE is given, HOME/.smartctl_tests_long.conf is used. This fallback option
+If no CONFIG_FILE is given, HOME/.smartctl_tests_long.conf or /etc/smartctl_tests_long.conf is used. This fallback option
 has to exist or the script will exit.
 
 Configuration can be done in any file and any pre-defined variable can be overwritten.
@@ -27,26 +27,42 @@ SMARTCTL_TESTS_LONG_MAIL_ADDRESS="";
 SMARTCTL_TESTS_LONG_DEVICES=(sda)
 
 # check for config file
-source_config() {
-	local config=$1;
-	local configFallback=$2;
+apply_config() {
+  local config=$1;
 
-	if [[ ! -f "$config" ]]; then
-		if [[ ! -f "$configFallback" ]]; then
-			echo "No config file specified and could not find default in '$configFallback'!";
-			echo "";
-			usage;
-			exit 1;
-		else
-			config=$configFallback;
-		fi
-	fi
+  if [[ ! -f "$config" ]]; then
+      echo "No config file specified";
+      echo "";
+      usage;
+      exit 1;
+  fi
 
-	set -a;
-	source "$config";
-	set +a;
+  set -a;
+  source "$config";
+  set +a;
 }
-source_config "$1" "$HOME/.smartctl_tests_long.conf"
+
+source_config() {
+  local config=$1;
+  local configFallback=$2;
+  local configGlobalFallback=$3;
+
+  if [[ -f "$config" ]]; then
+    apply_config "$config";
+    exit 0;
+  fi
+
+  if [[ -f "$configFallback" ]]; then
+    apply_config "$configFallback";
+    exit 0;
+  fi
+
+  if [[ -f "$configGlobalFallback" ]]; then
+    apply_config "$configGlobalFallback";
+    exit 0;
+  fi
+}
+source_config "$1" "$HOME/.smartctl_tests_long.conf" "/etc/smartctl_tests_long.conf"
 
 echo "Starting long tests for ...";
 
diff --git a/usr/local/bin/systemd_check b/usr/local/bin/systemd_check
index 0bcc179..401e841 100755
--- a/usr/local/bin/systemd_check
+++ b/usr/local/bin/systemd_check
@@ -7,7 +7,7 @@ Usage: systemd_check.sh [CONFIG_FILE (absolute path)]
 
 Checks if specific systemd SYSTEMD_CHECK_SERVICES are running and optionally sends a mail.
 
-If no CONFIG_FILE is given, HOME/.systemd_check.conf is used. This fallback option
+If no CONFIG_FILE is given, HOME/.systemd_check.conf or /etc/systemd_check.conf is used. This fallback option
 has to exist or the script will exit.
 
 Configuration can be done in any file and any pre-defined variable can be overwritten.
@@ -29,6 +29,7 @@ set -e;
 
 # vars and defaults
 SYSTEMD_CHECK_LIST_FILE="$HOME/.systemd_check.list"
+SYSTEMD_CHECK_GLOBAL_LIST_FILE="/etc/systemd_check.list"
 SYSTEMD_CHECK_MAIL_ENABLED=fase
 SYSTEMD_CHECK_MAIL_ADDRESS=""
 SYSTEMD_CHECK_HOSTNAME=$(hostname)
@@ -36,39 +37,62 @@ SYSTEMD_CHECK_USER=$(whoami)
 SYSTEMD_CHECK_SERVICES=()
 
 # check for config file
-source_config() {
-    local config=$1;
-    local configFallback=$2;
+apply_config() {
+  local config=$1;
 
-    if [[ ! -f "$config" ]]; then
-        if [[ ! -f "$configFallback" ]]; then
-            echo "No config file specified and could not find default in '$configFallback'!";
-            echo "";
-            usage;
-            exit 1;
-        else
-            config=$configFallback;
-        fi
-    fi
+  if [[ ! -f "$config" ]]; then
+      echo "No config file specified";
+      echo "";
+      usage;
+      exit 1;
+  fi
 
-    set -a;
-    source "$config";
-    set +a;
+  set -a;
+  source "$config";
+  set +a;
 }
-source_config "$1" "$HOME/.systemd_check.conf"
 
-if [ ! -f $SYSTEMD_CHECK_LIST_FILE ]; then
-	echo "$SYSTEMD_CHECK_LIST_FILE doesn't exist. Add a file which holds one systemd service or timer per line.";
+source_config() {
+  local config=$1;
+  local configFallback=$2;
+  local configGlobalFallback=$3;
+
+  if [[ -f "$config" ]]; then
+    apply_config "$config";
+    exit 0;
+  fi
+
+  if [[ -f "$configFallback" ]]; then
+    apply_config "$configFallback";
+    exit 0;
+  fi
+
+  if [[ -f "$configGlobalFallback" ]]; then
+    apply_config "$configGlobalFallback";
+    exit 0;
+  fi
+}
+source_config "$1" "$HOME/.systemd_check.conf" "/etc/systemd_check.conf"
+
+listFileToUse=""
+if [[ -f "$SYSTEMD_CHECK_LIST_FILE" ]]; then
+	listFileToUse="$SYSTEMD_CHECK_LIST_FILE"
+else
+	listFileToUse="$SYSTEMD_CHECK_GLOBAL_LIST_FILE"
+fi
+
+if [[ ! -f $listFileToUse ]]; then
+	echo "$listFileToUse doesn't exist. Add a file which holds one systemd service or timer per line.";
 	echo "";
 	usage;
 	exit 1;
 fi
 
-echo "Scanning $SYSTEMD_CHECK_LIST_FILE for services...";
+echo "Scanning $listFileToUse for services...";
 while IFS='' read -r line || [[ -n "$line" ]]; do
     SYSTEMD_CHECK_SERVICES+=("$line")
 	echo "-> Found $line";
-done < "$SYSTEMD_CHECK_LIST_FILE"
+done < "$listFileToUse"
 
 # get status for a service
 function checkService() {
diff --git a/usr/local/bin/systemd_failure_notify b/usr/local/bin/systemd_failure_notify
index 91aac9d..b4ff7e0 100755
--- a/usr/local/bin/systemd_failure_notify
+++ b/usr/local/bin/systemd_failure_notify
@@ -14,7 +14,7 @@ OnFailure=systemd_failure_notify@%n.service
 
 You should place the <scriptname>'s service into systemd's user and systemd's system folder so it can be used by global and user services.
 
-If no CONFIG_FILE is given, HOME/.systemd_failure_notify.conf is used. This fallback option
+If no CONFIG_FILE is given, HOME/.systemd_failure_notify.conf or /etc/systemd_failure_notify.conf is used. This fallback option
 has to exist or the script will exit.
 
 Configuration can be done in any file and any pre-defined variable can be overwritten.
@@ -43,26 +43,42 @@ SYSTEMD_FAILURE_NOTFY_USER=$(whoami)
 SYSTEMD_FAILURE_NOTIFY_MAIL_ADDRESS="";
 
 # check for config file
-source_config() {
-	local config=$1;
-	local configFallback=$2;
+apply_config() {
+  local config=$1;
 
-	if [[ ! -f "$config" ]]; then
-		if [[ ! -f "$configFallback" ]]; then
-			echo "No config file specified and could not find default in '$configFallback'!";
-			echo "";
-			usage;
-			exit 1;
-		else
-			config=$configFallback;
-		fi
-	fi
+  if [[ ! -f "$config" ]]; then
+      echo "No config file specified";
+      echo "";
+      usage;
+      exit 1;
+  fi
 
-	set -a;
-	source "$config";
-	set +a;
+  set -a;
+  source "$config";
+  set +a;
 }
-source_config "$2" "$HOME/.systemd_failure_notify.conf"
+
+source_config() {
+  local config=$1;
+  local configFallback=$2;
+  local configGlobalFallback=$3;
+
+  if [[ -f "$config" ]]; then
+    apply_config "$config";
+    exit 0;
+  fi
+
+  if [[ -f "$configFallback" ]]; then
+    apply_config "$configFallback";
+    exit 0;
+  fi
+
+  if [[ -f "$configGlobalFallback" ]]; then
+    apply_config "$configGlobalFallback";
+    exit 0;
+  fi
+}
+source_config "$2" "$HOME/.systemd_failure_notify.conf" "/etc/systemd_failure_notify.conf"
 
 SUBJECT="[systemd $SYSTEMD_FAILURE_NOTFY_HOSTNAME for $SYSTEMD_FAILURE_NOTFY_USER] $SYSTEMD_FAILURE_NOTFY_SERVICE RUN FAILED"
 MESSAGE="$SYSTEMD_FAILURE_NOTFY_SERVICE run failed"