[gnome-continuous-yocto/gnomeostree-3.28-rocko: 4004/8267] selftest/eSDK.py: fix sstate dir not found error

[Emmanuele Bassi <ebassi src gnome org>]

commit 9a1e8b9cf5769a96ea4260c9d3eec9d12406875e
Author: Chen Qi <Qi Chen windriver com>
Date:   Thu Jan 5 13:03:28 2017 +0800

    selftest/eSDK.py: fix sstate dir not found error
    
    Fix the error below when SSTATE_DIR is not "${BUILDDIR}/sstate-cache".
    
      FileNotFoundError: [Errno 2] No such file or directory: '/xxx/../sstate-cache'
    
    (From OE-Core rev: 785f0343d04c1684363b5289a3012cf7e1caa95f)
    
    Signed-off-by: Chen Qi <Qi Chen windriver com>
    Signed-off-by: Ross Burton <ross burton intel com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 meta/lib/oeqa/selftest/eSDK.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/meta/lib/oeqa/selftest/eSDK.py b/meta/lib/oeqa/selftest/eSDK.py
index 9d5c680..b43a452 100644
--- a/meta/lib/oeqa/selftest/eSDK.py
+++ b/meta/lib/oeqa/selftest/eSDK.py
@@ -55,7 +55,7 @@ class oeSDKExtSelfTest(oeSelfTest):
     @classmethod
     def setUpClass(cls):
         # Start to serve sstate dir
-        sstate_dir = os.path.join(os.environ['BUILDDIR'], 'sstate-cache')
+        sstate_dir = get_bb_var('SSTATE_DIR')
         cls.http_service = HTTPService(sstate_dir)
         cls.http_service.start()