From ccda88a07039c62d5d0bfde7fccef02ef3937ccf Mon Sep 17 00:00:00 2001
From: Ludovic Courtès <ludo@gnu.org>
Date: Wed, 19 Jan 2022 22:01:35 +0100
Subject: package: Honor '--dry-run' when target profile is already in store.

Fixes <https://issues.guix.gnu.org/53267>.
Reported by Tirifto <tirifto@posteo.cz>.

Regression introduced in 65ffb9388c1c3d870cb07e4cb3ef12c9ac06a161.

In the (unlikely) case where the profile we're targeting with "guix
upgrade -n" or similar is already built, a new profile generation would
be created and linked to despite the use of '-n'.  This is because
65ffb9388c1c3d870cb07e4cb3ef12c9ac06a161 assumed that dry-run behavior
would be handled solely by the build handler, which is not the case when
there's nothing to build.

* guix/scripts/package.scm (build-and-use-profile): Reintroduce #:dry-run?
and honor it.
(process-actions): Pass #:dry-run? to 'build-and-use-profile'.
* tests/guix-package-net.sh: Add test.
---
 guix/scripts/package.scm | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'guix/scripts/package.scm')

diff --git a/guix/scripts/package.scm b/guix/scripts/package.scm
index 4b9c5f210d..9699c70c6d 100644
--- a/guix/scripts/package.scm
+++ b/guix/scripts/package.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2012-2022 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org>
 ;;; Copyright © 2013, 2015 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2014, 2016 Alex Kost <alezost@gmail.com>
@@ -139,6 +139,7 @@ denote ranges as interpreted by 'matching-generations'."
 
 (define* (build-and-use-profile store profile manifest
                                 #:key
+                                dry-run?
                                 (hooks %default-profile-hooks)
                                 allow-collisions?
                                 bootstrap?)
@@ -154,6 +155,7 @@ hooks\" run when building the profile."
          (prof     (derivation->output-path prof-drv)))
 
     (cond
+     (dry-run? #t)
      ((and (file-exists? profile)
            (and=> (readlink* profile) (cut string=? prof <>)))
       (format (current-error-port) (G_ "nothing to be done~%")))
@@ -1069,6 +1071,7 @@ processed, #f otherwise."
                                    trans
                                    #:dry-run? dry-run?)
         (build-and-use-profile store profile new
+                               #:dry-run? dry-run?
                                #:allow-collisions? allow-collisions?
                                #:bootstrap? bootstrap?)))))
 
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