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- #!/bin/bash
- # _____ _ _
- # | __|___ ___ ___ _| |___ _____| |_ ___ ___ ___
- # | __| _| -_| -_| . | . | | . | . | | -_|
- # |__| |_| |___|___|___|___|_|_|_|___|___|_|_|___|
- #
- # Freedom in the Cloud
- #
- # Watchdog functions to keep systems running even if they crash
- # systemd itself can handle this, but some debian packages are in
- # twilight world where they still use the older init scripts
- #
- # License
- # =======
- #
- # Copyright (C) 2014-2018 Bob Mottram <bob@freedombone.net>
- #
- # This program is free software: you can redistribute it and/or modify
- # it under the terms of the GNU Affero General Public License as published by
- # the Free Software Foundation, either version 3 of the License, or
- # (at your option) any later version.
- #
- # This program is distributed in the hope that it will be useful,
- # but WITHOUT ANY WARRANTY; without even the implied warranty of
- # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- # GNU Affero General Public License for more details.
- #
- # You should have received a copy of the GNU Affero General Public License
- # along with this program. If not, see <http://www.gnu.org/licenses/>.
-
- # name of a script which keeps running processes going even if they crash
- WATCHDOG_SCRIPT_NAME="keepon"
-
- function install_watchdog_script {
- if [[ $(is_completed "${FUNCNAME[0]}") == "1" ]]; then
- return
- fi
- { echo '#!/bin/bash';
- echo 'LOGFILE=/var/log/keepon.log';
- echo "CURRENT_DATE=\$(date)"; } > "/usr/bin/$WATCHDOG_SCRIPT_NAME"
- # application specific stuff is added later
- chmod +x /usr/bin/$WATCHDOG_SCRIPT_NAME
-
- function_check cron_add_mins
- cron_add_mins 1 "/usr/bin/$WATCHDOG_SCRIPT_NAME"
-
- mark_completed "${FUNCNAME[0]}"
- }
-
- function daemon_is_running {
- daemon_name="$1"
- systemctl is-active "${daemon_name}" >/dev/null 2>&1 && echo Running
- }
-
- function add_watchdog_daemon {
- daemon_name="$1"
-
- { echo '';
- echo "# keep ${daemon_name} daemon running";
- echo "RUNNING=\$(systemctl is-active ${daemon_name} >/dev/null 2>&1 && echo Running)";
- echo "if [ ! \$RUNNING ]; then";
- echo " systemctl start ${daemon_name}";
- echo " echo -n \$CURRENT_DATE >> \$LOGFILE";
- echo " echo \"${daemon_name} daemon restarted\" >> \$LOGFILE";
- echo 'fi';
- echo "# End of ${daemon_name}"; } >> "/usr/bin/$WATCHDOG_SCRIPT_NAME"
- }
-
- function remove_watchdog_daemon {
- daemon_name="$1"
-
- sed -i "/# keep ${daemon_name} daemon running/,/# End of ${daemon_name}/d" "/usr/bin/$WATCHDOG_SCRIPT_NAME"
- }
-
- # NOTE: deliberately no exit 0
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