On Oct 29, 2015, at 9:55 AM, Richard W.M. Jones <rjones(a)redhat.com&gt; wrote: > On Thu, Oct 29, 2015 at 09:19:03AM -0500, Jason Pepas wrote: > Hi, > > I'm new to nbdkit and am trying to run a simple "single file block > device using mmap" setup, using this python script: > > import mmap > > def config(key, value): > print ("ignored parameter %s=%s" % (key, value)) > > def open(readonly): > print ("open: readonly=%d" % readonly) > f = open("disk","r+") > m = mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_WRITE) > return (f,m) > > def get_size(h): > size = 1024*1024 > > def pread(h, count, offset): > (f,m) = h > bytes = bytearray(m[offset:offset+count]) > return bytes > > def pwrite(h, buf, offset): > (f,m) = h > m[offset:offset+len(buf)] = bytearray(buf) > > > When I run this: > > /usr/sbin/nbdkit -f -v python script=single_file.py > > > I get this error: > > nbdkit: debug: registering > /usr/lib/x86_64-linux-gnu/nbdkit/plugins/nbdkit-python-plugin.so > nbdkit: debug: registered > /usr/lib/x86_64-linux-gnu/nbdkit/plugins/nbdkit-python-plugin.so (name > python) > nbdkit: debug: /usr/lib/x86_64-linux-gnu/nbdkit/plugins/nbdkit-python-plugin.so: > load > nbdkit: debug: /usr/lib/x86_64-linux-gnu/nbdkit/plugins/nbdkit-python-plugin.so: > config key=script, value=single_file.py > Traceback (most recent call last): > File "single_file.py", line 1, in <module> > import mmap > ImportError: /usr/lib/python2.7/lib-dynload/mmap.x86_64-linux-gnu.so: > undefined symbol: PyExc_SystemError > nbdkit: error: single_file.py: error running this script > > > Any ideas? It's probably this bug: https://bugzilla.redhat.com/1223870 Fixed in this commit: https://github.com/libguestfs/nbdkit/commit/77f4982e65840b6edff5e97d3dbdf... Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://libguestfs.org