[OE-core] [PATCH 1/1] targetcontrol.py: test sudo available while invoking runqemu

[Hongxu Jia]

While TEST_TARGET is qemu, the QemuRunner class invokes runqemu
to start qemu, and runqemu needs sudo to set up tap interface.

While sudo is not available, the exit of QemuRunner will cost 60
seconds and the exit message is not clear, so we add sudo available
test for QemuRunner before invoking runqemu. Here is the example:
...
ERROR: We need setting up tap interface under sudo
sudo: a password is required

ERROR: Function failed: do_testimage
...

Signed-off-by: Hongxu Jia <hongxu.jia at windriver.com>
---
 meta/lib/oeqa/targetcontrol.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/meta/lib/oeqa/targetcontrol.py b/meta/lib/oeqa/targetcontrol.py
index cc582dd..f6af5be 100644
--- a/meta/lib/oeqa/targetcontrol.py
+++ b/meta/lib/oeqa/targetcontrol.py
@@ -15,10 +15,22 @@ from oeqa.utils.qemurunner import QemuRunner
 from oeqa.controllers.testtargetloader import TestTargetLoader
 from abc import ABCMeta, abstractmethod
 
+def test_sudo_available(d):
+    res = subprocess.call('sudo -n ls', shell=True)
+    p = subprocess.Popen('sudo -n ls',
+                         shell=True,
+                         stdout=subprocess.PIPE,
+                         stderr=subprocess.PIPE)
+    if p.wait() != 0:
+        msg = "We need setting up tap interface under sudo\n"
+        msg += p.communicate()[1]
+        bb.fatal(msg)
+
 def get_target_controller(d):
     testtarget = d.getVar("TEST_TARGET", True)
     # old, simple names
     if testtarget == "qemu":
+        test_sudo_available(d)
         return QemuTarget(d)
     elif testtarget == "simpleremote":
         return SimpleRemoteTarget(d)
-- 
1.9.1