wrapGAppsHook: add wrapGApp helper

doc/languages-frameworks/gnome.xml

@@ -258,6 +258,16 @@ mkDerivation {
      </para>
     </listitem>
    </varlistentry>
+   <varlistentry xml:id="ssec-gnome-common-issues-weird-location">
+    <term>
+     I need to wrap a binary outside <filename>bin</filename> and <filename>libexec</filename> directories.
+    </term>
+    <listitem>
+     <para>
+      You can manually trigger the wrapping with <function>wrapGApp</function> in <literal>preFixup</literal> phase. It takes a path to a program as a first argument; the remaining arguments are passed directly to <function xlink:href="#fun-wrapProgram">wrapProgram</function> function.
+     </para>
+    </listitem>
+   </varlistentry>
   </variablelist>
  </section>
 </section>

pkgs/build-support/setup-hooks/wrap-gapps-hook.sh

@@ -8,6 +8,12 @@ find_gio_modules() {
 
 addEnvHooks "$targetOffset" find_gio_modules
 
+wrapGApp() {
+    local program="$1"
+    shift 1
+    wrapProgram "$program" "${gappsWrapperArgs[@]}" "$@"
+}
+
 # Note: $gappsWrapperArgs still gets defined even if $dontWrapGApps is set.
 wrapGAppsHook() {
   # guard against running multiple times (e.g. due to propagation)
@@ -52,7 +58,7 @@ wrapGAppsHook() {
         find "${targetDir}" -type f -executable -print0 \
           | while IFS= read -r -d '' file; do
           echo "Wrapping program '${file}'"
-          wrapProgram "${file}" "${gappsWrapperArgs[@]}"
+          wrapGApp "${file}"
         done
       fi
     done
@@ -71,7 +77,7 @@ wrapGAppsHook() {
           fi
         done
         echo "Wrapping link: '$linkPath'"
-        wrapProgram "${linkPath}" "${gappsWrapperArgs[@]}"
+        wrapGApp "${linkPath}"
       done
     fi
   fi