app-metrics/mysqld_exporter: Add ebuild with systemd service file.

Package-Manager: Portage-2.3.76, Repoman-2.3.16

app-metrics/mysqld_exporter/files/mysqld_exporter-r1.confd

@@ -0,0 +1,26 @@
+# /etc/conf.d/mysqld_exporter
+
+# PID file
+#EXPORTER_PIDFILE="/run/${RC_SVCNAME}.pid"
+
+# The termination timeout (start-stop-daemon parameter "retry") ensures
+# that the service will be terminated within a given time (60 + 5 seconds
+# per default) when you are stopping the service.
+#EXPORTER_TERMTIMEOUT="TERM/60/KILL/5"
+
+# User to run exporter as
+#EXPORTER_USER="mysqld_exporter"
+
+# User group to run exporter as
+#EXPORTER_GROUP="mysqld_exporter"
+
+# You can use this configuration option to pass additional options to the
+# start-stop-daemon, see start-stop-daemon(8) for more details.
+# Per default we wait 1000ms after we have started the service to ensure
+# that the daemon is really up and running.
+#EXPORTER_SSDARGS="--wait 1000"
+
+# Exporter flags
+# See `mysqld_exporter --help` for more details
+EXPORTER_FLAGS="--log.level=info"
+#EXPORTER_FLAGS="${EXPORTER_FLAGS} --yourAdditionalFlag"

app-metrics/mysqld_exporter/files/mysqld_exporter-r1.initd

@@ -0,0 +1,73 @@
+#!/sbin/openrc-run
+# Copyright 2016-2019 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+description="Prometheus exporter for MySQL server metrics"
+
+EXPORTER_FLAGS=${EXPORTER_FLAGS:-""}
+EXPORTER_USER=${EXPORTER_USER:-"mysqld_exporter"}
+EXPORTER_GROUP=${EXPORTER_GROUP:-"mysqld_exporter"}
+EXPORTER_PIDFILE=${EXPORTER_PIDFILE:-"/run/${RC_SVCNAME}.pid"}
+EXPORTER_SSDARGS=${EXPORTER_SSDARGS:-"--wait 1000"}
+EXPORTER_TERMTIMEOUT=${EXPORTER_TERMTIMEOUT:-"TERM/60/KILL/5"}
+
+command="/usr/bin/mysqld_exporter"
+command_args="${EXPORTER_FLAGS}"
+command_background="true"
+start_stop_daemon_args="${EXPORTER_SSDARGS}"
+start_stop_daemon_args="${start_stop_daemon_args} --user ${EXPORTER_USER}"
+start_stop_daemon_args="${start_stop_daemon_args} --group ${EXPORTER_GROUP}"
+
+# We are forcing log files because upstream is going to remove syslog support :/
+start_stop_daemon_args="${start_stop_daemon_args} --stdout /var/log/mysqld_exporter/${RC_SVCNAME}.log"
+start_stop_daemon_args="${start_stop_daemon_args} --stderr /var/log/mysqld_exporter/${RC_SVCNAME}.log"
+
+getconfig() {
+	local key="$1"
+	local value_default="$2"
+	local value=
+
+	if service_started; then
+		value="$(service_get_value "${key}")"
+	fi
+
+	if [ -z "${value}" ]; then
+		# Value not explicitly set
+		echo "${value_default}"
+	else
+		echo "${value}"
+	fi
+
+	return 0
+}
+
+pidfile="$(getconfig pidfile ${EXPORTER_PIDFILE})"
+retry="$(getconfig retry ${EXPORTER_TERMTIMEOUT})"
+
+configtest() {
+	if test "${command_args#*config\.my-cnf}" = "${command_args}"; then
+		local _default_config_file="/var/lib/mysqld_exporter/.my.cnf"
+		if [ ! -s "${_default_config_file}" ]; then
+			eerror "No MySQL credentials found in \"${_default_config_file}\"!"
+			eerror "Either create that file and add credentials or specify another file via \"-config.my-cnf\" flag."
+			return 1
+		fi
+	fi
+
+	return 0
+}
+
+depend() {
+	after net
+	use mysql
+}
+
+start_pre() {
+	if [ "${RC_CMD}" != "restart" ]; then
+		configtest || return 1
+	fi
+}
+
+start_post() {
+	service_set_value retry "${EXPORTER_TERMTIMEOUT}"
+}

app-metrics/mysqld_exporter/files/mysqld_exporter.confd

@@ -0,0 +1,26 @@
+# /etc/conf.d/mysqld_exporter
+
+# PID file
+#EXPORTER_PIDFILE="/run/${RC_SVCNAME}.pid"
+
+# The termination timeout (start-stop-daemon parameter "retry") ensures
+# that the service will be terminated within a given time (60 + 5 seconds
+# per default) when you are stopping the service.
+#EXPORTER_TERMTIMEOUT="TERM/60/KILL/5"
+
+# User to run exporter as
+#EXPORTER_USER="mysqld_exporter"
+
+# User group to run exporter as
+#EXPORTER_GROUP="mysqld_exporter"
+
+# You can use this configuration option to pass additional options to the
+# start-stop-daemon, see start-stop-daemon(8) for more details.
+# Per default we wait 1000ms after we have started the service to ensure
+# that the daemon is really up and running.
+#EXPORTER_SSDARGS="--wait 1000"
+
+# Exporter flags
+# See `mysqld_exporter --help` for more details
+EXPORTER_FLAGS="-log.level=info"
+#EXPORTER_FLAGS="${EXPORTER_FLAGS} -yourAdditionalFlag"

app-metrics/mysqld_exporter/files/mysqld_exporter.logrotate

@@ -0,0 +1,5 @@
+/var/log/mysqld_exporter/*.log {
+	missingok
+	notifempty
+	size 30k
+}

app-metrics/mysqld_exporter/files/mysqld_exporter.service

@@ -0,0 +1,10 @@
+[Unit]
+Description=MySqld Exporter
+
+[Service]
+User=mysqld_exporter
+EnvironmentFile=/etc/conf.d/mysqld_exporter
+ExecStart=/usr/bin/mysqld_exporter $EXPORTER_FLAGS
+
+[Install]
+WantedBy=multi-user.target