[systemd-devel] XML for Systemd DBus?

[František Šumšal]

On 8/9/23 17:48, Elsie Hupp wrote:
> Note: I am on elementaryOS 6.0.
> 
> I am trying to generate a vala interface from the Systemd DBus interface, following the example here to get the XML to feed into `vala-dbus-binding-tool`:
> 
> https://wiki.gnome.org/Projects/Vala/DBusClientSamples
> 
> But I am getting the following error:
> 
> ```bash
> $ dbus-send --print-reply --type=method_call --dest=org.freedesktop.systemd1 objectpath org.freedesktop.DBus.Introspectable.Introspect
> dbus[208973]: arguments to dbus_message_new_method_call() were incorrect, assertion "_dbus_check_is_valid_path (path)" failed in file ../../../dbus/dbus-message.c line 1366.
> This is normally a bug in some application using the D-Bus library.
> 
>    D-Bus not built with -rdynamic so unable to print a backtrace
> Aborted (core dumped)


You need to specify a valid object path as well:

$ dbus-send --print-reply --type=method_call --dest=org.freedesktop.systemd1 /org/freedesktop/systemd1 org.freedesktop.DBus.Introspectable.Introspect
method return time=1691596947.228708 sender=:1.1 -> destination=:1.862 serial=15362 reply_serial=2
    string "<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN"
"https://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
<node>
  <interface name="org.freedesktop.DBus.Peer">
...

> ```
> 
> I tried with a specific interface, as well:
> 
> ```bash
> $ dbus-send --print-reply --type=method_call --dest=org.freedesktop.systemd1.Device objectpath org.freedesktop.DBus.Introspectable.Introspect
> dbus[164720]: arguments to dbus_message_new_method_call() were incorrect, assertion "_dbus_check_is_valid_path (path)" failed in file ../../../dbus/dbus-message.c line 1366.
> This is normally a bug in some application using the D-Bus library.
> 
>    D-Bus not built with -rdynamic so unable to print a backtrace
> Aborted
> ```
> 
> I did several web searches of the error messages, and none of them were particularly helpful.
> 
> How do I get the XML for the Systemd DBus interface? Is there a way I can work around this error, or is there a copy available somewhere online?

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