[lxc-users] What's the best way to get stderr from lxc-attach when running a command?

[Dan Shi]

I'm trying to run some command in container through lxc-attach. The script
is in python 2.7. Apparently, command like following does not raise a
subprocess exception:
subprocess.check_output('lxc-attach -n c1 -- ls non_exist_dir')

One way to get the stderr from the ls command running in container could be
using -o option to direct the stderr to a local log file, then parse the
log file to see any errors. It's not really a clean solution. I'm wondering
if there is a better way to do this?

Thanks,
Dan
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