[OE-core] [rocko][PATCH 1/4] masterimage.py: fix issue with calling reboot on masterimage/DUT

[Stephano Cetola]

From: Erik Botö <erik.boto at pelagicore.com>

On systemd systems calling reboot over an ssh connection doesn't
return as expected causing an exception, therefore wrap the call
to reboot in order to avoid this issue.

Also sync the filesystems before rebooting cause otherwise, it will be
done as part of the reboot and could take a very long time and testimage
will fail to access the machine. This issue was observed consistently with
one of our rootfs at Pelagicore.

[YOCTO #11524]

Signed-off-by: Erik Botö <erik.boto at pelagicore.com>
Signed-off-by: Stephano Cetola <stephano.cetola at linux.intel.com>
---
 meta/lib/oeqa/controllers/masterimage.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meta/lib/oeqa/controllers/masterimage.py b/meta/lib/oeqa/controllers/masterimage.py
index 07418fcda1..fe90967923 100644
--- a/meta/lib/oeqa/controllers/masterimage.py
+++ b/meta/lib/oeqa/controllers/masterimage.py
@@ -108,7 +108,7 @@ class MasterImageHardwareTarget(oeqa.targetcontrol.BaseTarget, metaclass=ABCMeta
             time.sleep(10)
             self.power_ctl("cycle")
         else:
-            status, output = conn.run("reboot")
+            status, output = conn.run("sync; { sleep 1; reboot; } > /dev/null &")
             if status != 0:
                 bb.error("Failed rebooting target and no power control command defined. You need to manually reset the device.\n%s" % output)
 
-- 
2.14.2