The patch does not seem to get formatted correctly, sorry. Hopefully,
this should work.

Vivien
From 8dcf1a92cb6ebbc537029f88d5c7197cbf4959aa Mon Sep 17 00:00:00 2001
From: Vivien Kraus <viv...@planete-kraus.eu>
Date: Fri, 29 Oct 2021 18:25:24 +0200
Subject: [PATCH] gnu: openssh-service: Collect all keys for all users.

* gnu/services/ssh.scm: (authorized-key-directory)[build]: ensure that no key is forgotten.
---
 gnu/services/ssh.scm | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

diff --git a/gnu/services/ssh.scm b/gnu/services/ssh.scm
index a018052eeb..118dfdbef8 100644
--- a/gnu/services/ssh.scm
+++ b/gnu/services/ssh.scm
@@ -415,17 +415,23 @@ (define build
                        (guix build utils))
 
           (mkdir #$output)
-          (for-each (match-lambda
-                      ((user keys ...)
-                       (let ((file (string-append #$output "/" user)))
-                         (call-with-output-file file
-                           (lambda (port)
-                             (for-each (lambda (key)
-                                         (call-with-input-file key
-                                           (cut dump-port <> port)))
-                                       keys))))))
-                    '#$keys))))
-
+          (let ((by-user (make-hash-table)))
+            (for-each
+             (match-lambda
+               ((user keys ...)
+                (hash-set! by-user user (append (hash-ref by-user user '()) keys))))
+             '#$keys)
+            (hash-for-each
+             (match-lambda*
+               ((user keys)
+                (let ((file (string-append #$output "/" user)))
+                  (call-with-output-file file
+                    (lambda (port)
+                      (for-each (lambda (key)
+                                  (call-with-input-file key
+                                    (cut dump-port <> port)))
+                                keys))))))
+             by-user)))))
   (computed-file "openssh-authorized-keys" build))
 
 (define (openssh-config-file config)
-- 
2.33.1

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