Using libguestfs remotely with Python and rpyc

libguestfs has high quality Python bindings. Using rpyc you can make a remote libguestfs server with almost no effort at all.

Firstly start an rpyc server:

$ /usr/lib/python2.7/site-packages/rpyc/servers/classic_server.py
[SLAVE      INFO       13:21:17 tid=140019939981120] server started on 0.0.0.0:18812
[SLAVE      INFO       13:21:17 tid=140019784894208] started background auto-register thread (interval = 60)
[REGCLNT    INFO       13:21:17] registering on 255.255.255.255:18811
[REGCLNT    WARNING    13:21:19] no registry acknowledged

Now, possibly from the same machine or some other machine, you can connect to this server and use Python objects remotely as if they were local:

$ python
Python 2.7.3 (default, Aug  9 2012, 17:23:57) 
[GCC 4.7.1 20120720 (Red Hat 4.7.1-5)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import rpyc
>>> c = rpyc.classic.connect('localhost')

You can now create a libguestfs handle, following the example here.

>>> g = c.modules.guestfs.GuestFS()
>>> g.version()
{'release': 36L, 'major': 1L, 'minor': 21L, 'extra': 'fedora=20,release=1.fc20,libvirt'}
>>> g.add_drive('/dev/fedora/f18x64', readonly=True)
>>> g.launch()
>>> roots = g.inspect_os()
>>> g.inspect_get_product_name(roots[0])
'Fedora release 18 (Spherical Cow)'
>>> g.inspect_get_mountpoints(roots[0])
[('/', '/dev/mapper/fedora-root'), ('/boot', '/dev/sda1')]

As you can see, the g object is transparently remoted without you needing to do anything.

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