[gnome-continuous-yocto/gnomeostree-3.28-rocko: 6358/8267] runqemu: change terminal settings for valid tty's

[Emmanuele Bassi <ebassi src gnome org>]

commit 44c0e8c804146becba4a4bd207c451f610844082
Author: Mikko Ylinen <mikko ylinen linux intel com>
Date:   Tue Jun 13 18:39:09 2017 +0300

    runqemu: change terminal settings for valid tty's
    
    runqemu uses stty to change terminal settings to give users
    better control to qemu. However, stty does not work when
    runqemu is run directly or indirectly via oe-selftest in
    a Docker container (presumably some problems with Docker's
    pseudo-tty implementation).
    
    The error reported is:
    stty: 'standard input': Inappropriate ioctl for device
    
    As runqemu recently moved to subprocess.check_call() for
    stty calls we now get thrown an error and all runqemu
    runs fail.
    
    sys.stdin.isatty() does proper job in detecting if the stty
    calls can work so we use that check before running the stty
    subprocess operations.
    
    (From OE-Core rev: 06742ed59092530aedf03f65c3c9542c24ff7ac3)
    
    Signed-off-by: Mikko Ylinen <mikko ylinen linux intel com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 scripts/runqemu |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/scripts/runqemu b/scripts/runqemu
index 311fbeb..26328e5 100755
--- a/scripts/runqemu
+++ b/scripts/runqemu
@@ -955,8 +955,8 @@ class BaseConfig(object):
     def setup_network(self):
         if self.get('QB_NET') == 'none':
             return
-        cmd = "stty -g"
-        self.saved_stty = subprocess.Popen(cmd, shell=True, 
stdout=subprocess.PIPE).stdout.read().decode('utf-8')
+        if sys.stdin.isatty():
+            self.saved_stty = subprocess.check_output("stty -g", shell=True).decode('utf-8')
         self.network_device = self.get('QB_NETWORK_DEVICE') or self.network_device
         if self.slirp_enabled:
             self.setup_slirp()
@@ -1096,9 +1096,9 @@ class BaseConfig(object):
             self.qemu_opt += " -snapshot"
 
         if self.serialstdio:
-            logger.info("Interrupt character is '^]'")
-            cmd = "stty intr ^]"
-            subprocess.check_call(cmd, shell=True)
+            if sys.stdin.isatty():
+                subprocess.check_call("stty intr ^]", shell=True)
+                logger.info("Interrupt character is '^]'")
 
             first_serial = ""
             if not re.search("-nographic", self.qemu_opt):