oeqa: modernise subprocess: preexec_fn=os.setsid -> start_new_session=True

start_new_session was added to python3 subprocess in v3.2 and
is meant to take the place of the common use of preexec_fn to
call os.setsid() in the child - as done here.

Update to use the new equivalent.

(From OE-Core rev: c3bd502f31a621394a2f6ea3ae90443ff4ac98a4)

Signed-off-by: André Draszik <git@andred.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/meta/lib/oeqa/controllers/masterimage.py b/meta/lib/oeqa/controllers/masterimage.py
index 0435dfa125..0bf5917e48 100644
--- a/meta/lib/oeqa/controllers/masterimage.py
+++ b/meta/lib/oeqa/controllers/masterimage.py
@@ -97,7 +97,7 @@ class MasterImageHardwareTarget(oeqa.targetcontrol.BaseTarget, metaclass=ABCMeta
         if self.powercontrol_cmd:
             cmd = "%s %s" % (self.powercontrol_cmd, msg)
             try:
-                commands.runCmd(cmd, assert_error=False, preexec_fn=os.setsid, env=self.origenv)
+                commands.runCmd(cmd, assert_error=False, start_new_session=True, env=self.origenv)
             except CommandError as e:
                 bb.fatal(str(e))