#!/bin/sh -e

GOBIN=/opt/gocode/bin  # where to find go binaries
CONF_DIR=/etc/prometheus
LOGLEVEL=info
CONF=$CONF_DIR/alertmanager.yml

### Prometheus server #######################################################

config="$(cat "$__object/parameter/config")"
storage_path="$(cat "$__object/parameter/storage-path")"
listen_address="$(cat "$__object/parameter/listen-address")"

FLAGS="config.file '$CONF'
storage.path '$storage_path'
web.listen-address '$listen_address'
log.level $LOGLEVEL"

REAL_FLAGS="$(echo "$FLAGS" | sed -nE 's/^([^#]+).*/ --\1 \\/p')"

__go_get github.com/prometheus/alertmanager/cmd/...

__user prometheus --system
require="__user/prometheus" __directory "$storage_path" --owner prometheus --parents
require="__user/prometheus" __directory "$CONF_DIR"     --owner prometheus --parents

__daemontools_service alertmanager --run "setuidgid prometheus $GOBIN/alertmanager $REAL_FLAGS"

require="$require __directory/$storage_path __user/prometheus" \
__config_file $CONF \
	--source $config \
	--group prometheus --mode 640 \
	--onchange "svc -h /service/alertmanager"  # TODO when a config-check tool is available, check config here

