[OE-core] [mesa][PATCH v2 1/1] Fix mesa_populate_packages() when dri is disabled

[Herve Jourdain]

When compiling mesa, if dri is disabled in PACKAGECONFIG, or if the list of DRI drivers is empty, it will cause populate_package to fail, because it can't find - rightfully - the directory for the DRI drivers.
This patch checks that the directory indeed exists before trying to get a list of the files in it

Signed-off-by: Herve Jourdain <herve.jourdain at neuf.fr>
---
 meta/recipes-graphics/mesa/mesa.inc | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/meta/recipes-graphics/mesa/mesa.inc b/meta/recipes-graphics/mesa/mesa.inc
index a4e5351..0e46092 100644
--- a/meta/recipes-graphics/mesa/mesa.inc
+++ b/meta/recipes-graphics/mesa/mesa.inc
@@ -143,15 +143,16 @@ python mesa_populate_packages() {
 
     import re
     dri_drivers_root = os.path.join(d.getVar('libdir', True), "dri")
-    dri_pkgs = os.listdir(d.getVar('PKGD', True) + dri_drivers_root)
-    lib_name = d.expand("${MLPREFIX}mesa-megadriver")
-    for p in dri_pkgs:
-        m = re.match('^(.*)_dri\.so$', p)
-        if m:
-            pkg_name = " ${MLPREFIX}mesa-driver-%s" % legitimize_package_name(m.group(1))
-            d.appendVar("RPROVIDES_%s" % lib_name, pkg_name)
-            d.appendVar("RCONFLICTS_%s" % lib_name, pkg_name)
-            d.appendVar("RREPLACES_%s" % lib_name, pkg_name)
+    if os.path.isdir(d.getVar('PKGD', True) + dri_drivers_root):
+        dri_pkgs = os.listdir(d.getVar('PKGD', True) + dri_drivers_root)
+        lib_name = d.expand("${MLPREFIX}mesa-megadriver")
+        for p in dri_pkgs:
+            m = re.match('^(.*)_dri\.so$', p)
+            if m:
+                pkg_name = " ${MLPREFIX}mesa-driver-%s" % legitimize_package_name(m.group(1))
+                d.appendVar("RPROVIDES_%s" % lib_name, pkg_name)
+                d.appendVar("RCONFLICTS_%s" % lib_name, pkg_name)
+                d.appendVar("RREPLACES_%s" % lib_name, pkg_name)
 
     pipe_drivers_root = os.path.join(d.getVar('libdir', True), "gallium-pipe")
     do_split_packages(d, pipe_drivers_root, '^pipe_(.*)\.so$', 'mesa-driver-pipe-%s', 'Mesa %s pipe driver', extra_depends='')
-- 
2.7.4