entrypoint

#!/bin/bash -e

RUNDIR=/run/postgresql

if [[ ${1:0:1} = '-' ]]; then
    set -- postgres "$@"
fi

if [[ $1 = postgres ]]; then
    mkdir -p "$PGDATA"
    chmod 700 "$PGDATA"
    chown -R postgres "$PGDATA" "$RUNDIR"
    chmod g+s "$RUNDIR"

    # look specifically for PG_VERSION, as it is expected in the DB dir
    if [[ ! -s $PGDATA/PG_VERSION ]]; then
        eval "gosu postgres initdb $POSTGRES_INITDB_ARGS"

        if [[ -n $POSTGRES_PASSWORD ]]; then
                    pass="PASSWORD '$POSTGRES_PASSWORD'"

            echo "host all all 0.0.0.0/0 md5" >> "$PGDATA/pg_hba.conf"
            sed -ri "s|^#?(listen_addresses)\s*=\s*\S+.*|\1 = '*'|" $PGDATA/postgresql.conf
        else
            pass=
            echo 'WARNING: No $POSTGRES_PASSWORD set! Only local access enabled.'
        fi

        gosu postgres pg_ctl -o "-c listen_addresses='localhost'" -w start

        : ${POSTGRES_USER:=postgres}
        : ${POSTGRES_DB:=$POSTGRES_USER}
        export POSTGRES_USER POSTGRES_DB

        psql=( psql -v ON_ERROR_STOP=1 )

        if [[ $POSTGRES_DB != postgres ]]; then
            "${psql[@]}" --username postgres <<<"CREATE DATABASE \"$POSTGRES_DB\";"
            echo
        fi

        if [[ $POSTGRES_USER = postgres ]]; then
            op='ALTER'
        else
            op='CREATE'
        fi

        "${psql[@]}" --username postgres <<<"$op USER \"$POSTGRES_USER\" WITH SUPERUSER $pass;"

        psql+=( --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" )

        gosu postgres pg_ctl -m fast -w stop

        echo 'PostgreSQL init process complete; ready for start up.'
    fi

    exec gosu postgres "$@"
fi

exec "$@"