[lxc-users] [python-lxc] Store attach_wait in variable

[Stéphane Graber]

On Wed, Mar 08, 2017 at 10:08:29PM +0000, Élie Deloumeau-Prigent wrote:
> Hello everyone,
> 
> Is there any way to store attach_wait output into a variable?
> 
> Thanks in advance!
> 
> Élie.

There is, but it's not exactly trivial. attach_wait spawns a subprocess
through fork(), so the python process memory space isn't shared and the
output therefore goes to stdout/stderr.

What we did in the past for lxc-ls which needed something like that was
have the main python process create a temporary file with
tempfile.mkstemp(), then pass the fd as an argument to the function run
by attach_wait, have the function redirect the output towards that fd
and finally having the main process rewind and read from the fd after
attach_wait returns.


-- 
Stéphane Graber
Ubuntu developer
http://www.ubuntu.com
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