bug#58807: 28.1; Authentication in Gnus using password-store backend of auth-source

[bk]

Hi,

As it is written in subject I can't authenticate to my local dovecot 
server when I have enabled pass backend in auth-source. I don't have 
this problem if I use default ~/.authinfo file. If it's not exist it's 
generated by Emacs and contains line as follows:
machine localhost login bk@asterio.cloud password pass

My minimal ~/.emacs file
(setq auth-source-debug 'trivia)
(setq auth-sources '(password-store))

(setq gnus-select-method '(nnnil ""))
(setq gnus-secondary-select-methods
      '((nnimap "localhost"
                (nnimap-address "127.0.0.1")
                (nnimap-stream network)
                (nnimap-authenticator login)
                (nnimap-server-port 1143)
                (nnimap-user "bk@asterio.cloud"))))

According to documentation [1] I tried numerous of entries of my user 
password in pass:
pass ls
Password Store
├── 127.0.0.1
│   └── bk@asterio.cloud
├── bk@asterio.cloud@127.0.0.1
├── bk@asterio.cloud@localhost
└── localhost
    └── bk@asterio.cloud

But none of this works and in *Messages* buffer I have always following 
logs:
auth-source-backend-parse: invalid backend spec: password-store
auth-source-search: found 1 backends matching (:max 1 :host ("localhost" 
"127.0.0.1") :port (1143 "imap" "143") :user "bk@asterio.cloud" :require 
(:user :secret) :create t)
auth-source-search: found 0 results (max 1) matching (:max 1 :host 
("localhost" "127.0.0.1") :port (1143 "imap" "143") :user 
"bk@asterio.cloud" :require (:user :secret) :create t)
auth-source-search: CREATED 0 results (max 1) matching (:max 1 :host 
("localhost" "127.0.0.1") :port (1143 "imap" "143") :user 
"bk@asterio.cloud" :require (:user :secret) :create t)
Opening nnimap server on localhost...failed:

I don't try this backend and library in other situations (e.g. TRAMP) so 
I am not sure it's more related to Gnus or Auth-source.

[1] 
https://www.gnu.org/software/emacs/manual/html_node/auth/The-Unix-password-store.html


In GNU Emacs 28.1 (build 1, x86_64-suse-linux-gnu, GTK+ Version 3.24.34, 
cairo version 1.16.0)
Windowing system distributor 'SUSE LINUX', version 11.0.12201004
System Description: openSUSE MicroOS

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