Allow Nautilus to search for extensions in the directories listed
in $NAUTILUS_EXTENSION_PATH.

Index: nautilus-44.2/src/nautilus-module.c
===================================================================
--- nautilus-44.2.orig/src/nautilus-module.c
+++ nautilus-44.2/src/nautilus-module.c
@@ -220,8 +220,16 @@ static void
 load_module_dir (const char *dirname)
 {
     GDir *dir;
-
+    static GHashTable *loaded = NULL;
     g_autoptr (GStrvBuilder) installed_module_name_builder = g_strv_builder_new ();
+
+    if (installed_module_names != NULL)
+        g_strv_builder_addv (installed_module_name_builder,
+                             (const gchar **)installed_module_names);
+
+    if (loaded == NULL)
+      loaded = g_hash_table_new (g_str_hash, g_str_equal);
+
     dir = g_dir_open (dirname, 0, NULL);
 
     if (dir)
@@ -232,16 +240,24 @@ load_module_dir (const char *dirname)
         {
             if (g_str_has_suffix (name, "." G_MODULE_SUFFIX))
             {
-                char *filename;
-
-                filename = g_build_filename (dirname,
-                                             name,
-                                             NULL);
-                nautilus_module_load_file (filename, installed_module_name_builder);
-                g_free (filename);
+                /* Make sure each module is loaded only twice or this could
+                   lead to a crash.  Double loading can occur if DIRNAME
+                   occurs more than once in $NAUTILUS_EXTENSION_PATH.  */
+                if (!g_hash_table_contains (loaded, name))
+                {
+                    char *filename;
+
+                    filename = g_build_filename (dirname,
+                                                 name,
+                                                 NULL);
+                    nautilus_module_load_file (filename,
+                                               installed_module_name_builder);
+                    g_hash_table_add (loaded, g_strdup (name));
+                    g_free (filename);
+                }
             }
-        }
 
+        }
         g_dir_close (dir);
     }
 
@@ -278,10 +294,24 @@ nautilus_module_setup (void)
 
     if (!initialized)
     {
+        const gchar *extension_path;
         initialized = TRUE;
 
         load_module_dir (NAUTILUS_EXTENSIONDIR);
 
+	/* Load additional modules from the user-provided search path.  */
+	extension_path = g_getenv ("NAUTILUS_EXTENSION_PATH");
+	if (extension_path)
+	  {
+	    char **extension_dirs, **d;
+
+	    extension_dirs = g_strsplit (extension_path, ":", -1);
+	    for (d = extension_dirs; d != NULL && *d != NULL; d++)
+	      load_module_dir (*d);
+
+	    g_strfreev (extension_dirs);
+	  }
+
         eel_debug_call_at_shutdown (free_module_objects);
     }
 }
d-and-use-profile'.
* guix/scripts/system.scm (maybe-suggest-running-guix-pull)[latest]:
Switch to "/current".
* scripts/guix.in (augment-load-paths!): Remove use of
~/.config/guix/latest.
* build-aux/compile-as-derivation.scm: Replace "/guix/latest/" with
"/current/share/guile/site/X.Y"
* guix/scripts.scm (warn-about-old-distro)[age]: Check "/current"
instead of "/latest".
* doc/guix.texi (Invoking guix pull): Document it.
* doc/contributing.texi (Running Guix Before It Is Installed): Remove
footnote about abusing ~/.config/guix/latest.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-01-28 23:14:55 +0100'>2018-01-28</span></td><td><a href='/guix/commit/scripts?id=63666a348af5ef5190cbe9611c40f2b9188b7967'>guix: Let Emacs detect “scripts/guix.in” appropriate mode.</a><span class='msg-avail'>...<span class='msg-tooltip'>Since commit 6f774d481839f87178c5895ac2d661e141f879b8 which introduces the use
of Guile's meta switch in “scripts/guix.in”, Emacs was not using ‘scheme-mode’
for this file.

* scripts/guix.in: Replace "-*- scheme -*-" with a local variable.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Mathieu Lirzin</td></tr>
<tr><td><span title='2018-01-23 15:01:15 +0100'>2018-01-23</span></td><td><a href='/guix/commit/scripts?id=6f774d481839f87178c5895ac2d661e141f879b8'>guix: Refactor script.</a><span class='msg-avail'>...<span class='msg-tooltip'>* scripts/guix.in: Remove empty surrounding ‘let’.  Define 'main' as the
procedure called when running the script.
(maybe-augment-load-paths!): Rename to ...
(augment-load-paths!): ... this.  Use 'and=&gt;' for 'file-exists?'.
(run-guix-main): Rename to ...
(main): ... this.  Call 'augment-load-paths!'.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Mathieu Lirzin</td></tr>
<tr><td><span title='2018-01-23 10:13:16 +0100'>2018-01-23</span></td><td><a href='/guix/commit/scripts?id=cba386c1295b7054df22dfb4662b1b92f668e2c0'>build: Expand ‘scripts/guix’ at Make time.</a><span class='msg-avail'>...<span class='msg-tooltip'>This moves the complexity of Autotools variable expansion outside of the
application code.

* scripts/guix.in (config-lookup): Delete.
(maybe-augment-load-paths!, run-guix-main): Use fully expanded variables
instead of calling ‘config-lookup’.
* configure.ac: Don't use AC_CONFIG_FILES for ‘scripts/guix’.
Use AC_PROG_SED.
* Makefile.am (scripts/guix): New rule.
(do_subst): New variable.
(CLEANFILES, EXTRA_DIST): Adapt.

Co-authored-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Mathieu Lirzin</td></tr>
<tr><td><span title='2017-03-20 23:26:18 +0100'>2017-03-20</span></td><td><a href='/guix/commit/scripts?id=9437fd7399425ed281e1bfc13240288ba9078caa'>build: Install .go files to $libdir/guile/X.Y.</a><span class='msg-avail'>...<span class='msg-tooltip'>* configure.ac: Define and substitute 'guileobjectdir'.
* Makefile.am (nobase_nodist_guilemodule_DATA): Remove $(GOBJECTS).
(nobase_nodist_guileobject_DATA): New variable.
(guix_install_go_files): Adjust accordingly.
(install-data-hook): Likewise.
* scripts/guix.in (config-lookup): Add 'exec_prefix' and
'guileobjectdir'.  Add '_' in VAR-REF-REGEXP.
(maybe-augment-load-paths!): Distinguish OBJECT-DIR from MODULE-DIR.
</span></span></td><td>Ludovic Courtès</td></tr>