#!/bin/sh
# Purpose {{{
## If Xymon server says that the last apt update is too old, try to run a new one.
## 1. Create a ssh keyring for xymon user {{{
# sudo mkdir -p -- /var/lib/xymon/.ssh/
# sudo ssh-keygen -f /var/lib/xymon/.ssh/id_rsa -N '' -q
# sudo chown -R xymon:xymon /var/lib/xymon/.ssh/
## }}}
## 2. Remote user {{{
# Ensure to have the ${REMOTE_SSH_USER} available on remote hosts and allowed to connect with SSH.
# Restrict the SSH access to a single SSH key from the Xymon server IP (~${REMOTE_SSH_USER}/.ssh/authorized_keys) :
## from="IP.SRV.XYM.ON" ssh-rsa AAAAA…
# Allow sudo commands to restart services and run apt update (/etc/sudoers.d/xymon-ssh) :
## xymon-ssh ALL=(root:root) NOPASSWD: /usr/bin/apt update
## xymon-ssh ALL=(root:root) NOPASSWD: /bin/systemctl restart *
## }}}

# }}}
# Vars {{{
DEBUG=1

LOCAL_SSH_USER="xymon"
REMOTE_SSH_USER="xymon-ssh"

temp_dir=$(mktemp -d -t xymon-apt-alert-XXXXXX.tmp)
debug_stdout="${temp_dir}/debug.stdout"
debug_stderr="${temp_dir}/debug.stderr"
# }}}

# Create log files
touch "${debug_stdout}" "${debug_stderr}"

# Manage only apt probe {{{
if [ "${BBSVCNAME}" = "apt" ]; then
	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : ${BBHOSTNAME} — ${BBSVCNAME} error" >> "${debug_stdout}"
else
	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : ${BBHOSTNAME} — ${BBSVCNAME} probe is not managed." >> "${debug_stderr}"
	[ "${DEBUG}" -eq "0" ] || rm -rf -- "${temp_dir}"
	exit 0
fi
# }}}

# Check if repos need to be updated {{{
if echo "${BBALPHAMSG}" | grep -qE "\\&(red|yellow) Last apt update.*ago$" ; then
	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test APT repos — APT repos need to be updated." >> "${debug_stdout}"
	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test APT repos — ssh -n -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null ${REMOTE_SSH_USER}@${BBHOSTNAME} sudo apt update" >> "${debug_stdout}"
	ssh -n -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null "${REMOTE_SSH_USER}"@"${BBHOSTNAME}" "sudo apt update" >> "${debug_stdout}" 2>> "${debug_stderr}"
	# Also restart xymon-client service {{{
	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test APT repos — xymon-client also need to be restarted." >> "${debug_stdout}"
	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test APT repos — ssh -n -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null ${REMOTE_SSH_USER}@${BBHOSTNAME} sudo systemctl restart xymon-client.service" >> "${debug_stdout}"
	ssh -n -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null "${REMOTE_SSH_USER}"@"${BBHOSTNAME}" "sudo systemctl restart xymon-client.service" >> "${debug_stdout}" 2>> "${debug_stderr}"
	# }}}
fi
# }}}

# Remove empty error file
[ -s "${debug_stderr}" ] || rm -f "${debug_stderr}"

# Remove temp_dir if DEBUG is disable
[ "${DEBUG}" -eq "0" ] || rm -rf -- "${temp_dir}"

exit 0