134/136: profiles: Add a gdk-pixbuf-loaders-cache-file hook.

[guix-commits]

apteryx pushed a commit to branch core-updates-frozen-batched-changes
in repository guix.

commit 402c5dee9f95508ea6d697ab518a42f4392eb8c2
Author: Maxim Cournoyer <maxim.cournoyer@gmail.com>
AuthorDate: Sat Oct 2 21:28:24 2021 -0400

    profiles: Add a gdk-pixbuf-loaders-cache-file hook.
    
    This paves the way toward properly fixing https://issues.guix.gnu.org/50957.
    
    * guix/profiles.scm (gdk-pixbuf-loaders-cache-file): Add procedure...
    (%default-profile-hooks): ... and register it as a profile hook.
---
 guix/profiles.scm | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/guix/profiles.scm b/guix/profiles.scm
index 9494684..83f589c 100644
--- a/guix/profiles.scm
+++ b/guix/profiles.scm
@@ -7,7 +7,7 @@
 ;;; Copyright © 2016, 2018, 2019, 2021 Ricardo Wurmus <rekado@elephly.net>
 ;;; Copyright © 2016 Chris Marusich <cmmarusich@gmail.com>
 ;;; Copyright © 2017 Huang Ying <huang.ying.caritas@gmail.com>
-;;; Copyright © 2017 Maxim Cournoyer <maxim.cournoyer@gmail.com>
+;;; Copyright © 2017, 2021 Maxim Cournoyer <maxim.cournoyer@gmail.com>
 ;;; Copyright © 2019 Kyle Meyer <kyle@kyleam.com>
 ;;; Copyright © 2019 Mathieu Othacehe <m.othacehe@gmail.com>
 ;;; Copyright © 2020 Danny Milosavljevic <dannym@scratchpost.org>
@@ -1161,6 +1161,33 @@ MANIFEST.  Single-file bundles are required by programs 
such as Git and Lynx."
                     `((type . profile-hook)
                       (hook . emacs-subdirs))))
 
+(define (gdk-pixbuf-loaders-cache-file manifest)
+  "Return a derivation that produces a loaders cache file for every gdk-pixbuf
+loaders discovered in MANIFEST."
+  (define gdk-pixbuf                    ;lazy reference
+    (module-ref (resolve-interface '(gnu packages gtk)) 'gdk-pixbuf))
+
+  (mlet %store-monad ((%gdk-pixbuf (manifest-lookup-package
+                                    manifest "gdk-pixbuf"))
+                      (gdk-pixbuf-query-loaders
+                       -> (file-append gdk-pixbuf
+                                       "/bin/gdk-pixbuf-query-loaders")))
+    (define build
+      (with-imported-modules (source-module-closure
+                              '((guix build glib-or-gtk-build-system)))
+        #~(begin
+            (use-modules (guix build glib-or-gtk-build-system))
+            (generate-gdk-pixbuf-loaders-cache '#$(manifest-inputs manifest)
+                                               (list #$output)))))
+    (if %gdk-pixbuf
+        (gexp->derivation "gdk-pixbuf-loaders-cache-file" build
+                          #:local-build? #t
+                          #:substitutable? #f
+                          #:properties
+                          '((type . profile-hook)
+                            (hook . gdk-pixbuf-loaders-cache-file)))
+        (return #f))))
+
 (define (glib-schemas manifest)
   "Return a derivation that unions all schemas from manifest entries and
 creates the Glib 'gschemas.compiled' file."
@@ -1672,6 +1699,7 @@ the entries in MANIFEST."
         ghc-package-cache-file
         ca-certificate-bundle
         emacs-subdirs
+        gdk-pixbuf-loaders-cache-file
         glib-schemas
         gtk-icon-themes
         gtk-im-modules