Hi, We have this example in the manual, in (info "(guix) Database Services"):
--8<---------------cut here---------------start------------->8--- (service-extension postgresql-role-service-type (const (postgresql-role (name "alice") (create-database? #t)))) --8<---------------cut here---------------end--------------->8--- Unfortunately, it doesn't seem to work as intended. Adding the following to my configuration: --8<---------------cut here---------------start------------->8--- (service postgresql-service-type) (service postgresql-role-service-type (postgresql-role-configuration (roles (list (postgresql-role (name "maxim") (create-database? #t)))))) (service-extension postgresql-role-service-type (const (postgresql-role (name "cuirass") (create-database? #t)))) --8<---------------cut here---------------end--------------->8--- I get the following error upon reconfiguration: --8<---------------cut here---------------start------------->8--- Backtrace: 18 (primitive-load "/home/maxim/.config/guix/current/bin/g…") In guix/ui.scm: 2324:7 17 (run-guix . _) 2287:10 16 (run-guix-command _ . _) In ice-9/boot-9.scm: 1752:10 15 (with-exception-handler _ _ #:unwind? _ # _) In guix/status.scm: 859:3 14 (_) 839:4 13 (call-with-status-report _ _) In guix/scripts/system.scm: 1305:4 12 (_) In ice-9/boot-9.scm: 1752:10 11 (with-exception-handler _ _ #:unwind? _ # _) In guix/store.scm: 661:37 10 (thunk) 1300:8 9 (call-with-build-handler #<procedure 7f446c6d5c90 at g…> …) 2180:25 8 (run-with-store #<store-connection 256.99 7f44768a8a00> …) In guix/scripts/system.scm: 847:2 7 (_ _) 721:8 6 (_ #<store-connection 256.99 7f44768a8a00>) In gnu/system.scm: 1295:19 5 (operating-system-derivation _) In gnu/services.scm: 1166:6 4 (instantiate-missing-services _) In srfi/srfi-1.scm: 460:18 3 (fold #<procedure 7f446a968960 at gnu/services.scm:116…> …) In gnu/services.scm: 1167:27 2 (_ #<<service-extension> target: #<service-type postgr…> …) In ice-9/boot-9.scm: 1685:16 1 (raise-exception _ #:continuable? _) 1685:16 0 (raise-exception _ #:continuable? _) ice-9/boot-9.scm:1685:16: In procedure raise-exception: In procedure service-kind: Wrong type argument: #<<service-extension> target: #<service-type postgresql-role 7f4471875640> compute: #<procedure 7f446afc63a0 at ice-9/boot-9.scm:809:2 _>> --8<---------------cut here---------------end--------------->8--- -- Thanks, Maxim