devtest: add universal_newlines to subprocess call

subprocess call in python3+ return stderr and stdout object is byte
object instead of text. This caused many issue with parsing the ouput in
devtest. These are not an issue in python2. This change will make
devtest more python3 compatible.

Signed-off-by: Trung.Tran<trung.tran@ettus.com>

3 files changed, 4 insertions, 2 deletions

diff --git a/host/tests/devtest/run_testsuite.py b/host/tests/devtest/run_testsuite.py
index e243a4cda..99871b150 100755
--- a/host/tests/devtest/run_testsuite.py
+++ b/host/tests/devtest/run_testsuite.py
@@ -122,6 +122,7 @@ def main():
             stdin=subprocess.PIPE,
             stdout=subprocess.PIPE,
             stderr=subprocess.STDOUT,
+            universal_newlines=True
         )
         print(proc.communicate()[0])
         sys.stdout.flush()
diff --git a/host/tests/devtest/uhd_test_base.py b/host/tests/devtest/uhd_test_base.py
index d77226941..8d965eef7 100755
--- a/host/tests/devtest/uhd_test_base.py
+++ b/host/tests/devtest/uhd_test_base.py
@@ -77,7 +77,8 @@ class shell_application(object):
                 stdout=PIPE,
                 stderr=PIPE,
                 close_fds=True,
-                env=env
+                env=env,
+                universal_newlines=True
             )
             self.stdout, self.stderr = proc.communicate()
             self.returncode = proc.returncode
diff --git a/host/tests/devtest/usrp_probe.py b/host/tests/devtest/usrp_probe.py
index 43dd999c1..c7b73288e 100644
--- a/host/tests/devtest/usrp_probe.py
+++ b/host/tests/devtest/usrp_probe.py
@@ -17,7 +17,7 @@ def get_usrp_list(device_filter=None, env=None):
         cmd = ['uhd_find_devices']
         if device_filter is not None:
             cmd += ['--args', device_filter]
-        output = subprocess.check_output(cmd, env=env)
+        output = subprocess.check_output(cmd, env=env, universal_newlines=True)
     except subprocess.CalledProcessError:
         return []
     split_re = "\n*-+\n-- .*\n-+\n"