[systemd-devel] systemd-run fails with certain properties

[Daurnimator]

Trying to use systemd-run with certain properties consistently fails, e.g.:

$ systemd-run --scope --nice 18 --property=NoNewPrivileges=true echo test
Unknown assignment NoNewPrivileges=true.
Failed to create bus message: No such device or address

$ systemd-run --scope --user --nice 18 -p User=nobody echo hi
Failed to create bus message: Read-only file system