[util/cli] Add new CLI utilities

For now, this just allows executing commands

util/cli.py

@@ -0,0 +1,20 @@
+import shlex
+import subprocess
+import logging
+
+def execute(cmd, wait=True):
+    args = shlex.split(cmd)
+    logging.debug(cmd)
+    try:
+        proc = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+    except FileNotFoundError as e:
+        raise RuntimeError('{} not found'.format(cmd))
+
+    if wait:
+        out, _ = proc.communicate()
+        if proc.returncode != 0:
+            raise RuntimeError('{} exited with {}'.format(cmd, proc.returncode))
+        return out.decode('utf-8')
+    return '' 
+
+# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4