[ovirt-devel] python path conflicts issues while running python scripts from vdsm verbs

[Ramesh Nachimuthu]

----- Original Message -----
> From: "Nir Soffer" <nsoffer at redhat.com>
> To: "Ramesh Nachimuthu" <rnachimu at redhat.com>
> Cc: "devel" <devel at ovirt.org>, "Dan Kenigsberg" <danken at redhat.com>, "Piotr Kliczewski" <pkliczew at redhat.com>, "Yaniv
> Bronheim" <ybronhei at redhat.com>, "Aravinda Vishwanathapura Krishna Murthy" <avishwan at redhat.com>, "Sahina Bose"
> <sabose at redhat.com>
> Sent: Tuesday, November 29, 2016 7:20:57 PM
> Subject: Re: python path conflicts issues while running python scripts from vdsm verbs
> 
> On Tue, Nov 29, 2016 at 3:26 PM, Ramesh Nachimuthu <rnachimu at redhat.com>
> wrote:
> > Hi,
> >
> >  I am trying to run a python script '/sbin/gluster-eventsapi' in vdsm verb
> >  which internally imports some python modules from
> >  /usr/lib/python2.7/site-packages/gluster/cliutils/. But it fails with the
> >  import error. Following error is seen in the supervdsm log.
> >
> >
> > MainProcess|Thread-1::DEBUG::2016-11-28
> > 16:54:35,130::commands::93::root::(execCmd) FAILED: <err> = 'Traceback
> > (most recent call last):\n  File "/sbin/gluster-eventsapi", line 25, in
> > <module>\n    from gluster.cliutils.cliutils import (Cmd, execute,
> > node_output_ok, node_output_notok,\nImportError: No module named
> > cliutils.cliutils\n'; <rc> = 1
> >
> >
> > I think the import statement "from gluster.cliutils.cliutils import (Cmd,
> > execute, node_output_ok, node_output_notok)" in the python script resolves
> > to '/usr/share/vdsm/gluster' instead of
> > /usr/lib/python2.7/site-packages/gluster/cliutils.
> >
> > I see the following in python sys.path while executing a python script from
> > vdsm.
> >
> > ['/usr/libexec/glusterfs', '/usr/share/vdsm', '/usr/lib64/python27.zip',
> > '/usr/lib64/python2.7', '/usr/lib64/python2.7/plat-linux2',
> > '/usr/lib64/python2.7/lib-tk', '/usr/lib64/python2.7/lib-old',
> > '/usr/lib64/python2.7/lib-dynload', '/usr/lib64/python2.7/site-packages',
> > '/usr/lib64/python2.7/site-packages/gtk-2.0',
> > '/usr/lib/python2.7/site-packages']
> >
> > Looks like '/usr/share/vdsm' take precedence over
> > '/usr/lib64/python2.7/site-packages'.
> >
> > Can someone suggests a way to fix this issue?
> >
> > Note: '/sbin/gluster-eventsapi' works perfectly while running directly from
> > CLI.
> >
> > Related vdsm patch:
> > https://gerrit.ovirt.org/#/c/67168/2/vdsm/gluster/events.py
> 
> If an import fails because /usr/share/vdsm/foo hides a package in
> /usr/lib/python2.7/site-packages/vdsm it means that you have a wrong
> import, you need to import anything like this:
> 
>     from vdsm.foo import bar
> 
> So names in /usr/share/vdsm/* cannot hide names in vdsm package.
> 

Here its a different case. Some external python script (which I am trying to run from vdsm verb) is trying to import some gluster package from /usr/lib/python2.7/site-packages/gluster. But it is conflicting with gluster modules under /usr/share/vdsm/gluster

Python Script which I am trying to run: https://github.com/gluster/glusterfs/blob/master/events/src/peer_eventsapi.py

Regards,
Ramesh

> Nir
>