Hi Simon,
this is based upon our chat earlier today.
Basically, my problem was that I was unable to get basu to run on my system CRUX 3.6. The error was:
<27>(../basu-6b339972e848975aa0ef9caf0e65266f902823a5/src/busctl/busctl.c:138) Failed to connect to bus: No such file or directory
This seems to be because basu has a hardcoded path for the system socket (output generated by strace):
connect(3, {sa_family=AF_UNIX, sun_path="/run/dbus/system_bus_socket"}, 30) = -1 ENOENT (No such file or directory)
It's hardcoded here and for testing here
Problem seems to be that CRUX compiles dbus to use the "deprecated" /var path (see here), while dbus uses some logic to generate it's default config, see here.
I tested changing the path locally in a git checkout and it worked just fine after that :)