sanity.bbclass: Check if DISPLAY is set when IMAGETEST is set

Fixes [BUGID: 594]

In imagetest-qemu.bbclass, we depend on DISPLAY to start qemu in
a X desktop. When user wants to run qemu sanity test, we need to
check if the variable is set.

Signed-off-by Jiajun Xu <jiajun.xu@intel.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/meta/classes/sanity.bbclass b/meta/classes/sanity.bbclass
index e1f37ac1f4..bc02a828c4 100644
--- a/meta/classes/sanity.bbclass
+++ b/meta/classes/sanity.bbclass
@@ -139,6 +139,10 @@ def check_sanity(e):
                 missing = missing.rstrip(',')
                 messages = messages + "Please install following missing utilities: %s\n" % missing
 
+        # Check if DISPLAY is set if IMAGETEST is set
+        if not data.getVar( 'DISPLAY', e.data, True ) and data.getVar( 'IMAGETEST', e.data, True ) == 'qemu':
+                messages = messages + 'qemuimagetest needs a X desktop to start qemu, please set DISPLAY correctly (e.g. DISPLAY=:1.0)\n'
+
         # Ensure we have the binary for TERMCMD, as when patch application fails the error is fairly intimidating
         termcmd = data.getVar("TERMCMD", e.data, True)
         term = termcmd.split()[0]