postinst

#!/bin/sh

set -e

# NOTE: the grafana-agent group is shared with the grafana-agent package to
# make it easier to migrate between the two. A unique user is still used to
# give them different home directories.

# shellcheck disable=SC1091
[ -f /etc/sysconfig/grafana-agent-flow ] && . /etc/sysconfig/grafana-agent-flow
[ -z "$AGENT_USER" ] && AGENT_USER="grafana-agent-flow"
[ -z "$AGENT_GROUP" ] && AGENT_GROUP="grafana-agent"

add_to_logging_groups() {
  # Add grafana agent user to groups used for reading logs.
  if getent group adm > /dev/null 2>&1 ; then
      usermod -a -G adm "$AGENT_USER"
  fi
  if getent group systemd-journal > /dev/null 2>&1 ; then
      usermod -a -G systemd-journal "$AGENT_USER"
  fi
}

# Initial installation: $1 == 1
# Upgrade: $1 == 2, and configured to restart on upgrade
if [ "$1" -eq 1 ] ; then
    if ! getent group "$AGENT_GROUP" > /dev/null 2>&1 ; then
        groupadd -r "$AGENT_GROUP"
    fi
    if ! getent passwd "$AGENT_USER" > /dev/null 2>&1 ; then
        useradd -r -m -g "$AGENT_GROUP" -d /var/lib/grafana-agent-flow -s /sbin/nologin -c "grafana-agent-flow user" "$AGENT_USER"
    fi

    add_to_logging_groups

    chown $AGENT_USER:$AGENT_GROUP /var/lib/grafana-agent-flow
    chmod 770 /var/lib/grafana-agent-flow

    chmod 640 /etc/grafana-agent-flow.river
    chown root:$AGENT_GROUP /etc/grafana-agent-flow.river

elif [ "$1" -ge 2 ] ; then
    add_to_logging_groups

    if [ "$RESTART_ON_UPGRADE" = "true" ]; then
        systemctl daemon-reload
        systemctl restart grafana-agent-flow
    fi
fi