#122234 gave Desktop update steps NUL stdin, but the hand-off script
that runs is the one from the checkout being updated FROM. Every update
that starts on an older commit still runs the old script, which gives
steps the hand-off console as stdin and captures their stdout until
they exit. Only the steps after `hermes update` run new code.
So `gateway start --all` from the new checkout still saw an interactive
console, asked "Install it now so the gateway starts on login?" into
the captured stdout, and waited forever. The update never relaunched.
start() now asks only when stdout is a terminal too. Nobody can answer
a question they cannot see.
af3299a22c