[OE-core] [PATCH v2] gtk-immodules-cache.bbclass: allow for offline cache generation

[Laurentiu Palcu]

In order to support a RO rootfs, the cache generation during postinstall
has to be done on host. However, gtk-query-immodules application will
only be able to parse shared objects from the same ELF class.
In order not to have a native package for all the recipes providing
an input method, so we can generate the cache file natively, run
gtk-query-immodules through qemu emulator.

Signed-off-by: Laurentiu Palcu <laurentiu.palcu at intel.com>
---

Changes in v2:
 * Used qemu_target_binary() function, in order to obtain the qemu binary
   corresponding to the current target, as suggested by Phil (thank you,
   I didn't know that function existed);

Thanks,
Laurentiu

 meta/classes/gtk-immodules-cache.bbclass |   21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/meta/classes/gtk-immodules-cache.bbclass b/meta/classes/gtk-immodules-cache.bbclass
index 515d28b..72595ee 100644
--- a/meta/classes/gtk-immodules-cache.bbclass
+++ b/meta/classes/gtk-immodules-cache.bbclass
@@ -2,9 +2,28 @@
 #
 # Usage: Set GTKIMMODULES_PACKAGES to the packages that needs to update the inputmethod modules
 
+DEPENDS =+ "qemu-native"
+
+inherit qemu
+
 gtk_immodule_cache_postinst() {
 if [ "x$D" != "x" ]; then
-    exit 1
+
+for maj_ver in 2 3; do
+    if [ -x $D${bindir}/gtk-query-immodules-$maj_ver.0 ]; then
+        IMFILES=$(ls $D${libdir}/gtk-$maj_ver.0/*/immodules/*.so)
+        DYNAMIC_LOADER=$D$(readelf -a $D${bindir}/gtk-query-immodules-$maj_ver.0 |\
+            grep "Requesting program interpreter"|sed -e 's/^.*\[.*: \(.*\)\]/\1/')
+        LIBRARY_PATH=$D${base_libdir}:$D${libdir}
+        ${@qemu_target_binary(d)} $DYNAMIC_LOADER --library-path $LIBRARY_PATH \
+            $D${bindir}/gtk-query-immodules-$maj_ver.0 $IMFILES > $D/etc/gtk-$maj_ver.0/gtk.immodules 2>/dev/null && \
+            sed -i -e "s:$D::" $D/etc/gtk-$maj_ver.0/gtk.immodules
+
+        [ $? -ne 0 ] && exit 1
+    fi
+done
+
+exit 0
 fi
 if [ ! -z `which gtk-query-immodules-2.0` ]; then
     gtk-query-immodules-2.0 > /etc/gtk-2.0/gtk.immodules
-- 
1.7.9.5