[OE-core] [RFC 4/7] gtk-icon-cache: run the icon generation at rootfs time

[Laurentiu Palcu]

This change will allow for the icon cache generation at rootfs time and
only once, at the end. So, even though there will be many packages
depending on gtk+, the icon cache generation will be done once.
Hopefully, this will lower the target's first boot time significantly
by using the power of the host machine to generate the cache.

Signed-off-by: Laurentiu Palcu <laurentiu.palcu at intel.com>
---
 meta/classes/gtk-icon-cache.bbclass |   21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/meta/classes/gtk-icon-cache.bbclass b/meta/classes/gtk-icon-cache.bbclass
index 01fb2f3..f65b11c 100644
--- a/meta/classes/gtk-icon-cache.bbclass
+++ b/meta/classes/gtk-icon-cache.bbclass
@@ -1,12 +1,24 @@
 FILES_${PN} += "${datadir}/icons/hicolor"
 
-DEPENDS += "${@['hicolor-icon-theme', '']['${BPN}' == 'hicolor-icon-theme']}"
+DEPENDS += "${@['hicolor-icon-theme', '']['${BPN}' == 'hicolor-icon-theme']} gtk+-native"
 
-# This could run on the host as icon cache files are architecture independent,
-# but there is no gtk-update-icon-cache built natively.
 gtk_icon_cache_postinst() {
 if [ "x$D" != "x" ]; then
-        exit 1
+    if [ ! -f $INTERCEPT_DIR/update_icon_cache ]; then
+        cat << "EOF" > $INTERCEPT_DIR/update_icon_cache
+#!/bin/bash -x
+
+# Update the native pixbuf loader's cache
+gdk-pixbuf-query-loaders --update-cache
+
+for icondir in $D/usr/share/icons/* ; do
+    if [ -d $icondir ] ; then
+        gtk-update-icon-cache -fqt  $icondir
+    fi
+done
+EOF
+    fi
+    exit 0
 fi
 
 # Update the pixbuf loaders in case they haven't been registered yet
@@ -17,6 +29,7 @@ for icondir in /usr/share/icons/* ; do
         gtk-update-icon-cache -fqt  $icondir
     fi
 done
+
 }
 
 gtk_icon_cache_postrm() {
-- 
1.7.9.5