[PATCH][V2] pixbufcache: handle gdk-pixbuf not being present

It's possible - albeit unlikely - that gdk-pixbuf isn't present in the sysroot
when a recipe inheriting this class is and the sysroot is finalised.

One example would be if the sstate archive has librsvg but not gdk-pixbuf:
librsvg will be extracted from the sstate but gdk-pixbuf will be built to "fill
in the gap".  In this situation the setscene completion hook installed by
pixbufcache.bbclass will attempt to execute gdk-pixbuf-query-loaders, but that
binary hasn't been installed by gdk-pixbuf yet.

Also add gdk-pixbuf-native to DEPENDS in native builds to ensure that the
binaries we expect will be present, as it's possible to build loaders without
linking to GdkPixbuf.

[ YOCTO #10420 ]

Signed-off-by: Ross Burton <redacted>
---
 meta/classes/pixbufcache.bbclass | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/meta/classes/pixbufcache.bbclass b/meta/classes/pixbufcache.bbclass
index dbe11e1..3f48a0f 100644
--- a/meta/classes/pixbufcache.bbclass
+++ b/meta/classes/pixbufcache.bbclass

@@ -54,6 +54,7 @@ gdkpixbuf_complete() {
 # An error exit during populate_sysroot_setscene allows bitbake to
 # try to recover by re-building the package.
 #
+DEPENDS_append_class-native = " gdk-pixbuf-native"
 SSTATEPOSTINSTFUNCS_append_class-native = " pixbufcache_sstate_postinst"
 
 # See base.bbclass for the other half of this

@@ -61,7 +62,8 @@ pixbufcache_sstate_postinst() {
 	if [ "${BB_CURRENTTASK}" = "populate_sysroot" ]; then
 		${gdkpixbuf_complete}
 	elif [ "${BB_CURRENTTASK}" = "populate_sysroot_setscene" ]; then
-		echo "${gdkpixbuf_complete}" >> ${STAGING_DIR}/sstatecompletions
+		if [ -x ${STAGING_LIBDIR_NATIVE}/gdk-pixbuf-2.0/gdk-pixbuf-query-loaders ]; then
+			echo "${gdkpixbuf_complete}" >> ${STAGING_DIR}/sstatecompletions
+		fi
 	fi
 }
-

-- 
2.8.1