oeqa: Test failure/cleanup improvements

Currently, if qemu segfaults, the tests merrily continue trying to execute
which takes time for them to timeout and is a bit silly. Worse, no logs about
the segfault are shown to the user, its silent!

This patch tries to unravel the tangled web of issues and ensures that we:

* install a SIGCHLD handler which tells the user qemu exited
* check if qemu is running, if it isn't fail the test outright
* don't leave processes behind in sshcontrol which would hold
  bitbake.lock and block shutdown

(From OE-Core rev: 5c04b1ca1e989f569d5755a646734d01a0c56cae)

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

1 files changed, 3 insertions, 0 deletions

diff --git a/meta/lib/oeqa/targetcontrol.py b/meta/lib/oeqa/targetcontrol.py
index 542e259112..edc0d01c1e 100644
--- a/meta/lib/oeqa/targetcontrol.py
+++ b/meta/lib/oeqa/targetcontrol.py
@@ -188,6 +188,9 @@ class QemuTarget(BaseTarget):
                     bb.error("Qemu log output from %s:\n%s" % (self.qemulog, f.read()))
             raise bb.build.FuncFailed("%s - FAILED to start qemu - check the task log and the boot log" % self.pn)
 
+    def check(self):
+        return self.runner.is_alive()
+
     def stop(self):
         self.runner.stop()
         self.connection = None