[PATCH v2 5/8] iotests.py: add qemu_tool_popen()

[Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>]

Split qemu_tool_popen() from qemu_tool_pipe_and_status() to be used
separately.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 tests/qemu-iotests/iotests.py | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 6c9bcf9042..df9834e43a 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -89,16 +89,21 @@ luks_default_secret_object = 'secret,id=keysec0,data=' + \
 luks_default_key_secret_opt = 'key-secret=keysec0'
 
 
+def qemu_tool_popen(tool: str, args: Sequence[str],
+                    connect_stderr: bool = True) -> subprocess.Popen:
+    stderr = subprocess.STDOUT if connect_stderr else None
+    return subprocess.Popen(args,
+                            stdout=subprocess.PIPE,
+                            stderr=stderr,
+                            universal_newlines=True)
+
+
 def qemu_tool_pipe_and_status(tool: str, args: Sequence[str],
                               connect_stderr: bool = True) -> Tuple[str, int]:
     """
     Run a tool and return both its output and its exit code
     """
-    stderr = subprocess.STDOUT if connect_stderr else None
-    subp = subprocess.Popen(args,
-                            stdout=subprocess.PIPE,
-                            stderr=stderr,
-                            universal_newlines=True)
+    subp = qemu_tool_popen(tool, args, connect_stderr)
     output = subp.communicate()[0]
     if subp.returncode < 0:
         cmd = ' '.join(args)
-- 
2.21.3