Gnome-tweaks does not look at GSETTINGS_SCHEMA_PATH or XDG_DATA_DIRS, it
assumes that schemas are installed in one global directory
(GSETTINGS_SCHEMA_DIR/gsettingsschemadir).

Guix/GuixSD uses a different directory for every gir package and has
packages pick-up files using XDG_DATA_DIRS.

Upstream ticket: https://bugzilla.gnome.org/show_bug.cgi?id=764537
janneke@gnu.org

--- gnome-tweak-3.18.1.orig/gtweak/gsettings.py	2015-04-08 15:21:32.000000000 +0200
+++ gnome-tweak-tool-3.18.1/gtweak/gsettings.py	2016-04-03 11:26:38.658482704 +0200
@@ -16,7 +16,8 @@
 # along with gnome-tweak-tool.  If not, see <http://www.gnu.org/licenses/>.
 
 import logging
-import os.path
+import os
+import sys
 import xml.dom.minidom
 import gettext
 
@@ -31,6 +32,13 @@
 class GSettingsMissingError(Exception):
     pass
 
+def file_from_path(path, file_name):
+    for dir in path:
+        f = os.path.join(dir, file_name)
+        if os.path.exists(f):
+            return f
+    return None
+
 class _GSettingsSchema:
     def __init__(self, schema_name, schema_dir=None, schema_filename=None, **options):
         if not schema_dir:
@@ -38,9 +46,14 @@
         if not schema_filename:
             schema_filename = schema_name + ".gschema.xml"
 
+        schema_prefix = os.path.join('glib-2.0', 'schemas')
         schema_path = os.path.join(schema_dir, schema_filename)
         if not os.path.exists(schema_path):
-            logging.critical("Could not find schema %s" % schema_path)
+            schema_path = file_from_path(os.environ.get ('GSETTINGS_SCHEMA_PATH', '').split(os.path.pathsep), schema_filename)
+        if not (schema_path and os.path.exists(schema_path)):
+            schema_path = file_from_path(os.environ.get ('XDG_DATA_DIRS', '').split(os.path.pathsep), os.path.join(schema_prefix, schema_filename))
+        if not (schema_path and os.path.exists(schema_path)):
+            logging.critical("Could not find schema %s" % schema_filename)
             assert(False)
 
         self._schema_name = schema_name
d=8851c55b538f62534f16c1dd1e22657ef2f3c916'>root</a>/<a href='/guix/log/tests?id=8851c55b538f62534f16c1dd1e22657ef2f3c916'>tests</a>/<a href='/guix/log/tests/guix-build.sh?id=8851c55b538f62534f16c1dd1e22657ef2f3c916'>guix-build.sh</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/guix-build.sh?id=8851c55b538f62534f16c1dd1e22657ef2f3c916&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-12-02 23:18:52 +0100'>2024-12-02</span></td><td><a href='/guix/commit/tests/guix-build.sh?id=58a8d3b180e3130bcbc9c371836d411474aa0c96'>tests: Adjust ‘guix build -P1’ test to new packages.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes a bug introduced in 794e079437c8687f49d294322dab3b7a8a6abacf
whereby the grep patterns used in this test would also match
/gnu/store/…-rust-libgit2-sys-0.17.0+1.8.1.drv, thus getting 5 matches
instead of 4.

* tests/guix-build.sh: Refine grep patterns for ‘guix build -P1’ test.

Reported-by: Janneke Nieuwenhuizen &lt;janneke@gnu.org&gt;
Change-Id: Iae35e6ee44b8eca0ef66c1d8ab7f9ff65a59d8d0
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2024-12-01 20:14:15 +0100'>2024-12-01</span></td><td><a href='/guix/commit/tests/guix-build.sh?id=6b14eb3402034531bc7d9b70f273ca1a66e42d4b'>guix build: Add ‘--dependents’.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/scripts/build.scm (show-help, %options): Add ‘--dependents’.
(dependents): New procedure.
(options-&gt;things-to-build): Add ‘store’ parameter; honor ‘dependents’
option.
[for-type]: Handle ‘dependents’ type.
(options-&gt;derivations): Update call to ‘options-&gt;things-to-build’.
* tests/guix-build.sh: Add test.
* doc/guix.texi (Additional Build Options): Document ‘--dependents’.
(Invoking guix refresh): Cross-reference it.
* doc/contributing.texi (Submitting Patches): Mention it.

Change-Id: I00b6d5831e1f1d35dc8b84a82605391d5a8f417c
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2024-12-01 20:14:15 +0100'>2024-12-01</span></td><td><a href='/guix/commit/tests/guix-build.sh?id=a6334223719bf6b2695d2dc0e75dbfe69e901bd7'>guix build: Add ‘--development’ option.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/scripts/build.scm (show-help, %options): Add ‘-D’.
(options-&gt;things-to-build): Change ‘append-map’ to a loop.  Honor ‘-D’.
* tests/guix-build.sh: Add test.
* doc/guix.texi (Additional Build Options): Document it.

Reviewed-by: Maxim Cournoyer &lt;maxim.cournoyer@gmail.com&gt;
Change-Id: I99227aadfe861e43c001a4872292bd687b37f5d4
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2024-07-18 17:31:18 +0200'>2024-07-18</span></td><td><a href='/guix/commit/tests/guix-build.sh?id=0553c4447115f7be208fe3e7e29e365ecb74a564'>guix build: Take ‘--system’ into account together with ‘-S’.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/scripts/build.scm (options-&gt;derivations)[compute-derivation]:
Pass ‘system’ to ‘package-source-derivation’.
* tests/guix-build.sh: Test ‘-S’ together with ‘-s’.

Change-Id: If35f116285dd9caaf939221163ad0ba831eea993
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-08-17 17:33:53 +0200'>2023-08-17</span></td><td><a href='/guix/commit/tests/guix-build.sh?id=3363ff1867bb02c4aa4955db917ef1d67f2c47e6'>ui: 'load*' accepts /dev/fd/N files pointing to a pipe.</a><span class='msg-avail'>...<span class='msg-tooltip'>This allows users to write Bash commands like:

  guix time-machine -C &lt;(echo %default-channels) -- ...

or:

  guix build -m &lt;(echo '(specifications-&gt;manifest (list "guile"))')

Previously, on GNU/Linux, they would fail with:

  error: failed to load '/dev/fd/63': No such file or directory

* guix/ui.scm (try-canonicalize-path): New procedure.
(load*): Use it.
* tests/guix-build.sh: Test 'guix build -m' with a /dev/fd/N file.
</span></span></td><td>Ludovic Courtès</td></tr>