https://github.com/systemd/systemd/issues/7153#issuecomment-485252308
Apparently this is still confusing for people.
Longer-term, I think we should just make BindMount= automatically "upgrade"
(or "downgrade", depending on how you look at this), any InaccessiblePath=
mountpoints to "tmpfs". I don't see much point in forcing users to remember
this interaction. But let's at least document the status quo, we can always
update the docs if the code changes.
A service might be able to detect errors by itself that may require the
system to take the same action as if the service locked up. Add a
WATCHDOG=trigger state change notification to sd_notify() to let the
service manager know about the self-detected misery and instantly
trigger the configured watchdog behaviour.
The interface provided by those two functions is huge, so this text could
probably be made two or three times as long if all details were described.
But I think it's a good start.
This wraps the call to org.freedesktop.DBus.Introspectable.Introspect.
Using "busctl call" directly is inconvenient because busctl escapes the
string before printing.
Example:
$ busctl introspect --xml org.freedesktop.systemd1 /org/freedesktop/systemd1 | pygmentize -lxml | less -RF
test-bus-introspect is also applied to the tables from test-bus-vtable.c.
test-bus-vtable.c is also used as C++ sources to produce test-bus-vtable-cc,
and our hashmap headers are not C++ compatible. So let's do the introspection
part only in the C version.
