This also fixes a build error with GCC 10 on fedora.

Journald was missing some error messages when kresd failed to start.

Well, the part about giving semantics to nil actually
decreases strictness.

The preconfig is used to set distro-specific values to avoid messing
with user config, in partciular:

- binding to control sockets under systemd
- setting default cache location

- reduce visibility in docs
- add deprecation warnings (docs and stderr)

- consistent order of the options on the three places in parse_args()
- drop remains of -m -k -K
  It didn't seem to cause any problems except confusion in
  $ kresd -k
  kresd: option requires an argument -- 'k'

Unlink the unix address in case the file exists, e.g. from previous
unclean run.
Also attempt to create the directory for unix socket in case it doesn't
exist.

Without support for socket activation, it no longer makes sense to
let an ununsed socket pass without error.

reuseaddr/reuseport and freebind only make sense for AF_INET, AF_INET6

Vladimír Čunát authored 5 years ago and Tomas Krizek committed 5 years ago

There's only one backend and no other is even in long-term plans.
There used to be some networked backend, but due to synchronous internal
usage of cache these suffered from bad latency and were removed.

- mention process management
- describe privileges and capabilities which have to be configured
- move garbage collector to this section, as is it enabled by default

Petr Špaček authored 5 years ago and Tomas Krizek committed 5 years ago

Also remove extra headers for trust anchors and mode(), this is an
implementation detail not important for users.