oeqa/runqemu: Only show stdout/stderr upon test failure

In general we don't need to see the output of runqemu however if it fails
we do. Use the buffer option that already exists in TestResult but allow
us to trigger it on a per test basis.

(From OE-Core rev: 86bef95bccbe9dad3dc3445ea365439861966179)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/core/runner.py

@@ -45,6 +45,14 @@ class OETestResult(_TestResult):
         self.tc = tc
         self._tc_map_results()
 
+    def startTest(self, test):
+        # Allow us to trigger the testcase buffer mode on a per test basis
+        # so stdout/stderr are only printed upon failure. Enables debugging
+        # but clean output
+        if hasattr(test, "buffer"):
+            self.buffer = True
+        super(OETestResult, self).startTest(test)
+
     def _tc_map_results(self):
         self.tc._results['failures'] = self.failures
         self.tc._results['errors'] = self.errors

meta/lib/oeqa/selftest/cases/runqemu.py

@@ -14,6 +14,8 @@ class RunqemuTests(OESelftestTestCase):
 
     image_is_ready = False
     deploy_dir_image = ''
+    # We only want to print runqemu stdout/stderr if there is a test case failure
+    buffer = True
 
     def setUpLocal(self):
         super(RunqemuTests, self).setUpLocal()