Re: Wrong type argument in position 1 (expecting struct): #<procedure sddm-service (#:optional config)>

[znavko]

I've got working config for gnome+wayland. here it is 
https://gitgud.io/znavko/guix-configs

May 9, 2019 7:26 AM, "rendaw" <address@hidden> wrote:

> On 5/9/19 2:55 PM, address@hidden wrote:
> 
>> Hello! I try to reconfigure system with Gnome, sddm and wayland.
>> I also use sddm-configuration to define use wayland for greeter, but get the 
>> error for my
>> misconfiguration:
>> 
>> # cat config.scm
>> ...
>> (services (cons*
>> ;(service xfce-desktop-service-type)
>> (service gnome-desktop-service-type)
>> (service dhcp-client-service-type)
>> (service sddm-service
>> (sddm-configuration
>> (display-server "wayland")))
>> ...
>> )
>> 
>> # guix system reconfigure config.scm
>> Backtrace:
>> 14 (primitive-load "/root/.config/guix/current/bin/guix")
>> In guix/ui.scm:
>> 1734:12 13 (run-guix-command _ . _)
>> In ice-9/boot-9.scm:
>> 829:9 12 (catch _ _ #<procedure 7ff6047408f8 at guix/ui.scm:701…> …)
>> 829:9 11 (catch _ _ #<procedure 7ff604740910 at guix/ui.scm:824…> …)
>> In guix/scripts/system.scm:
>> 1301:8 10 (_)
>> In guix/status.scm:
>> 768:4 9 (call-with-status-report _ _)
>> In guix/scripts/system.scm:
>> 1159:4 8 (process-action _ _ _)
>> In guix/store.scm:
>> 623:10 7 (call-with-store _)
>> 1794:24 6 (run-with-store _ _ #:guile-for-build _ #:system _ # _)
>> In guix/scripts/system.scm:
>> 1175:13 5 (_ _)
>> 882:18 4 (perform-action reconfigure #<<operating-system> kerne…> …)
>> In gnu/system.scm:
>> 851:19 3 (operating-system-derivation _)
>> In gnu/services.scm:
>> 743:6 2 (instantiate-missing-services _)
>> In guix/combinators.scm:
>> 45:26 1 (fold2 #<procedure adjust-service-list (svc result ins…> …)
>> In gnu/services.scm:
>> 733:11 0 (adjust-service-list _ (#<<service> type: #<service…> …) …)
>> 
>> gnu/services.scm:733:11: In procedure adjust-service-list:
>> In procedure struct_vtable: Wrong type argument in position 1 (expecting 
>> struct): #<procedure
>> sddm-service (#:optional config)>
>> Please, let me know how to understand such errors. Here, I saw the same 
>> structure
>> https://www.gnu.org/software/guix/manual/en/guix.html#index-sddm_002dservice
> 
> (sddm-service ...) returns a service instance so you don't need to wrap
> it in (service ...).  I think the key point to notice is it's
> `sddm-service` and not `sddm-service-type` - service types go in
> `(service ...)` as the second parameter but `service-*` functions
> replace the `(service ...)` call entirely.
> 
> I'm not sure if there's more information you can get from the backtrace,
> but where it says:
> 
> position 1 (expecting struct): #<procedure sddm-service (#:optional config)>
> 
> it's saying it wanted a struct but got `sddm-service` which is a
> `procedure` (function). And the last line of the trace has:
> 
> 733:11 0 (adjust-service-list _ (#<<service> type: #<service…> …) …)
> 
> -- all the <service> things make me think that it's probably looking for
> a struct of type <service>.
> 
> If you change it from `(service sddm-service)` to `(sddm-service
> (sddm-configuration))` it should work (although you might want to
> specify some values in sdm-configuration.