mavcaldav took -pass and -render-pass as flag values, so enabling it would
have put his calendar password in `ps` inside the container, in the compose
file, and in shell history. mavpoll and mavmaild both read their secret from
a file for exactly that reason.
readSecret reads once at start, trims, and refuses an empty or missing file.
An empty file is a deployment mistake, not a password, and basic auth would
otherwise send "" and collect a 401 every poll. A rotated password means a
restart, which is cheaper than re-reading the credential every five minutes.
Nothing called the old flags: no compose service, no systemd unit, no test.
So they are replaced rather than kept beside the new ones.
claude
beaa24754c