build: jami-service: account->username always return a fingerprint.

This change is motivated by the fact that Account.registeredName is a volatile
account data, not exported along the account and retrieved from the name
server.  Have it always return Account.username instead, so that the result is
reproducible independent of whether networking is available or not.

* gnu/build/jami-service.scm (account->username): Always return the account
fingerprint.  Adjust doc.
(id->username): Likewise.

1 files changed, 3 insertions, 6 deletions

diff --git a/gnu/build/jami-service.scm b/gnu/build/jami-service.scm
index 0ceb03eb02..a00785f699 100644
--- a/gnu/build/jami-service.scm
+++ b/gnu/build/jami-service.scm
@@ -153,14 +153,11 @@ implementation detail used to identify the accounts in Jami."
         (error message username))))
 
 (define (account->username account)
-  "Return USERNAME, the registered username associated with ACCOUNT, else its
-public key fingerprint."
-  (or (assoc-ref account "Account.registeredName")
-      (assoc-ref account "Account.username")))
+  "Return the public key fingerprint of ACCOUNT."
+  (assoc-ref account "Account.username"))
 
 (define (id->username id)
-  "Return USERNAME, the registered username associated with ID, else its
-public key fingerprint, else #f."
+  "Return the public key fingerprint corresponding to account with ID, else #f."
   (account->username (id->account id)))
 
 (define (get-accounts)