Weird flex: pv that reports its progress to systemd (needs NotifyAccess=all), e.g. for backup scripts

pv-systemd-notify.sh

pv-systemd-notify() {
    if [[ -v NOTIFY_SOCKET ]]; then
        local f
        function f {
            stdbuf -oL tr '\r' '\n' | while IFS= read -r; do
                systemd-notify --status="$REPLY"
            done
        }
        pv -f 2> >(f) "$@"
    else
        pv "$@"
    fi
}