Log the actual commandline being run

This makes it easier to debug problems. The log domain 'sandboxlib' is
used, so callers can handle the log messages from 'sandboxlib' however
they want using the Python 'logging' API.

1 files changed, 9 insertions, 0 deletions

diff --git a/sandboxlib/__init__.py b/sandboxlib/__init__.py
index 0b150d7..b4199f1 100644
--- a/sandboxlib/__init__.py
+++ b/sandboxlib/__init__.py
@@ -25,6 +25,7 @@ docstrings that describe the different parameters.
 import logging
 import os
 import platform
+import pipes
 import shutil
 import subprocess
 import sys
@@ -195,6 +196,11 @@ def validate_extra_mounts(extra_mounts):
     return new_extra_mounts
 
 
+
+def argv_to_string(argv):
+    return ' '.join(map(pipes.quote, argv))
+
+
 def _run_command(argv, stdout, stderr, cwd=None, env=None):
     '''Wrapper around subprocess.Popen() with common settings.
 
@@ -215,6 +221,9 @@ def _run_command(argv, stdout, stderr, cwd=None, env=None):
     else:
         dev_null = None
 
+    log = logging.getLogger('sandboxlib')
+    log.debug('Running: %s', argv_to_string(argv))
+
     try:
         process = subprocess.Popen(
             argv,