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01/05: services: guix: Add 'generate-substitute-key?' field.

From: guix-commits
Subject: 01/05: services: guix: Add 'generate-substitute-key?' field.
Date: Thu, 10 Mar 2022 17:51:01 -0500 (EST)

civodul pushed a commit to branch master
in repository guix.

commit 5e34e873af088ef9aa417290bcddf5b095501614
Author: Ludovic Court├Ęs <>
AuthorDate: Thu Mar 10 22:27:04 2022 +0100

    services: guix: Add 'generate-substitute-key?' field.
    * gnu/services/base.scm (<guix-configuration>)[generate-substitute-key?]:
    New field.
    (guix-activation): Honor it.
    * doc/guix.texi (Base Services): Document it.
 doc/guix.texi         | 12 ++++++++++++
 gnu/services/base.scm |  8 ++++++--
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/doc/guix.texi b/doc/guix.texi
index f479fe05ff..01c16ba85d 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -17030,6 +17030,18 @@ This example assumes that the file 
 contains the public key that @code{} uses to sign
+@item @code{generate-substitute-key?} (default: @code{#t})
+Whether to generate a @dfn{substitute key pair} under
+@file{/etc/guix/} and @file{/etc/guix/signing-key.sec} if
+there is not already one.
+This key pair is used when exporting store items, for instance with
+@command{guix publish} (@pxref{Invoking guix publish}) or @command{guix
+archive} (@pxref{Invoking guix archive}).  Generating a key pair takes a
+few seconds when enough entropy is available and is only done once; you
+might want to turn it off for instance in a virtual machine that does
+not need it and where the extra boot time is a problem.
 @item @code{max-silent-time} (default: @code{0})
 @itemx @code{timeout} (default: @code{0})
 The number of seconds of silence and the number of seconds of activity,
diff --git a/gnu/services/base.scm b/gnu/services/base.scm
index 463f034305..f278cb76de 100644
--- a/gnu/services/base.scm
+++ b/gnu/services/base.scm
@@ -183,6 +183,7 @@
+            guix-configuration-generate-substitute-key?
@@ -1565,6 +1566,8 @@ archive' public keys, with GUIX."
                     (default #t))
   (substitute-urls  guix-configuration-substitute-urls ;list of strings
                     (default %default-substitute-urls))
+  (generate-substitute-key? guix-configuration-generate-substitute-key?
+                            (default #t))         ;Boolean
   (chroot-directories guix-configuration-chroot-directories ;list of 
                       (default '()))
   (max-silent-time  guix-configuration-max-silent-time ;integer
@@ -1749,14 +1752,15 @@ proxy of 'guix-daemon'...~%")
 (define (guix-activation config)
   "Return the activation gexp for CONFIG."
   (match-record config <guix-configuration>
-    (guix authorize-key? authorized-keys)
+    (guix generate-substitute-key? authorize-key? authorized-keys)
         ;; Assume that the store has BUILD-GROUP as its group.  We could
         ;; otherwise call 'chown' here, but the problem is that on a COW 
         ;; chown leads to an entire copy of the tree, which is a bad idea.
         ;; Generate a key pair and optionally authorize substitute server keys.
-        (unless (file-exists? "/etc/guix/")
+        (unless (or #$(not generate-substitute-key?)
+                    (file-exists? "/etc/guix/"))
           (system* #$(file-append guix "/bin/guix") "archive"

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