[Libguestfs] python 3 bindings on libguestfs

Mon Feb 5 11:58:45 UTC 2018

Hi,

Please find below warning which I am facing while running "make" in source code of libguestfs-1.32.4:

**********************************************************************
make[2]: Entering directory `/root/rpmbuild/SOURCES/libguestfs-1.32.4/python'
  CC       libguestfsmod_la-guestfs-py.lo
In file included from guestfs-py.c:36:0:
guestfs-py.h: In function 'put_handle':
guestfs-py.h:56:5: warning: implicit declaration of function 'PyCObject_FromVoidPtrAndDesc' [-Wimplicit-function-declaration]
     PyCObject_FromVoidPtrAndDesc ((void *) g, (char *) "guestfs_h", NULL);
     ^
guestfs-py.h:56:5: warning: nested extern declaration of 'PyCObject_FromVoidPtrAndDesc' [-Wnested-externs]
guestfs-py.h:55:3: warning: return makes pointer from integer without a cast [enabled by default]
   return
   ^
  CC       libguestfsmod_la-guestfs-py-byhand.lo
In file included from guestfs-py-byhand.c:35:0:
guestfs-py.h: In function 'put_handle':
guestfs-py.h:56:5: warning: implicit declaration of function 'PyCObject_FromVoidPtrAndDesc' [-Wimplicit-function-declaration]
     PyCObject_FromVoidPtrAndDesc ((void *) g, (char *) "guestfs_h", NULL);
     ^
guestfs-py.h:56:5: warning: nested extern declaration of 'PyCObject_FromVoidPtrAndDesc' [-Wnested-externs]
guestfs-py.h:55:3: warning: return makes pointer from integer without a cast [enabled by default]
   return
   ^
***********************************************************************

I hope this may create below issue:

[root at euca-10-254-5-129 libguestfs-1.32.4]$ ./run python
Python 3.5.1 (default, Jan 30 2018, 06:34:19)
[GCC 4.8.2 20140120 (Red Hat 4.8.2-16)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import guestfs
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/root/rpmbuild/SOURCES/libguestfs-1.32.4/python/guestfs.py", line 73, in <module>
    import libguestfsmod
ImportError: /root/rpmbuild/SOURCES/libguestfs-1.32.4/python/.libs/libguestfsmod.cpython-35m-x86_64-linux-gnu.so: undefined symbol: PyCObject_FromVoidPtrAndDesc
>>>

Please help me to fix this issue.

Regards,
Abinaya

-----Original Message-----
From: Abinaya Sandhiya Manikandan (GIS)
Sent: Monday, February 5, 2018 11:19 AM
To: libguestfs at redhat.com
Subject: RE: [Libguestfs] python 3 bindings on libguestfs

Hi,

Can we get any update/suggestion about below mails.

Regards,
Abinaya

-----Original Message-----
From: Abinaya Sandhiya Manikandan (GIS)
Sent: Friday, February 2, 2018 12:59 PM
To: 'libguestfs at redhat.com' <libguestfs at redhat.com>
Subject: RE: [Libguestfs] python 3 bindings on libguestfs

++FYI

Also I could see some patches on below link:

https://www.redhat.com/archives/libguestfs/2014-August/msg00134.html

But those are not available in libguestfs-1.32.10.

PYTHON 2 bindings working perfectly and PYTHON 3 having issues.

Regards,
Abinaya

-----Original Message-----
From: Abinaya Sandhiya Manikandan (GIS)
Sent: Friday, February 2, 2018 12:10 PM
To: 'libguestfs at redhat.com' <libguestfs at redhat.com>
Subject: RE: [Libguestfs] python 3 bindings on libguestfs

Hi,

Looking at python 3 bindings it looks like some issue in libguestfs.
I have tried a lot and still facing "undefined Symbol" issue while importing guestfs.

But Able to enable python 3 bindings in libguestfs but it's not working as expected.

I could see another user faced same issue and the same has reported in below link:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=646360

I hope libguestfs-1.32.10 also having same issue.

Please help us on this.

Regards,
Abinaya

-----Original Message-----
From: Abinaya Sandhiya Manikandan (GIS)
Sent: Thursday, February 1, 2018 10:30 AM
To: libguestfs at redhat.com
Subject: RE: [Libguestfs] python 3 bindings on libguestfs

Hi,

Have tried python2 bindings on libguestfs-1.32.10 (fresh installation).
It seems like still the log is like below:

checking for python... python
checking Python version... 2.7
checking for PYTHON... yes
checking Python prefix... /opt/python/x86_64/2.7.11-1 checking for Python site-packages path... /opt/python/x86_64/2.7.11-1/lib/python2.7/site-packages
checking for Python extension suffix (PEP-3149)... .so checking for PyCapsule_New in -lc... no checking for PyString_AsString in -lc... no

But python-guestfs is working fine without any issue on python 2.7.11.

[root at euca-10-254-20-192 libguestfs-1.32.10]$ ./run python
>>> import guestfs
>>> g = guestfs.GuestFS(python_return_dict=True)
>>> help(guestfs)
Help on module guestfs:

NAME
    guestfs - Python bindings for libguestfs

FILE
    /var/fpwork/libguestfs/SOURCES/libguestfs-1.32.10/python/guestfs.py

DESCRIPTION
    import guestfs
    g = guestfs.GuestFS (python_return_dict=True)
    g.add_drive_opts ("guest.img", format="raw")
    g.launch ()
    parts = g.list_partitions ()

    The guestfs module provides a Python binding to the libguestfs API
    for examining and modifying virtual machine disk images.

    Amongst the things this is good for: making batch configuration
    changes to guests, getting disk used/free statistics (see also:
    virt-df), migrating between virtualization systems (see also:
    virt-p2v), performing partial backups, performing partial guest
    clones, cloning guests and changing registry/UUID/hostname info, and
    much else besides.

    Libguestfs uses Linux kernel and qemu code, and can access any type of
    guest filesystem that Linux and qemu can, including but not limited
    to: ext2/3/4, btrfs, FAT and NTFS, LVM, many different disk partition
    schemes, qcow, qcow2, vmdk.

    Libguestfs provides ways to enumerate guest storage (eg. partitions,
    LVs, what filesystem is in each LV, etc.).  It can also run commands
    in the context of the guest.  Also you can access filesystems over
    FUSE.

I have followed same steps which I tried with python 3 but here its working as expected.

Can you suggest us for further.

Regards,
Abinaya

-----Original Message-----
From: Richard W.M. Jones [mailto:rjones at redhat.com]
Sent: Wednesday, January 31, 2018 7:33 PM
To: Abinaya Sandhiya Manikandan (GIS) <abinaya.manikandan at wipro.com>
Cc: libguestfs at redhat.com
Subject: Re: [Libguestfs] python 3 bindings on libguestfs

** This mail has been sent from an external source **

On Wed, Jan 31, 2018 at 09:09:11AM +0000, abinaya.manikandan at wipro.com wrote:
> Hi,
>
> We have done on fresh instance.
>
> We have manually installed libguestfs-1.32.10.
> I could see below log while running ./configure:
>
> checking Python version... 3.6
> checking for PYTHON... yes
> checking Python prefix... /opt/python/x86_64/3.6.3-1 checking for
> Python site-packages path...
> /opt/python/x86_64/3.6.3-1/lib/python3.6/site-packages
> checking for Python extension suffix (PEP-3149)...
> .cpython-36m-x86_64-linux-gnu.so checking for PyCapsule_New in -lc...
> no

This is supposed to be ‘yes’ which is why it's failing.  You'll have to debug m4/guestfs_python.m4 and config.log to find out why that is but something is obviously broken about your Python installation.

Rich.

--
Richard Jones, Virtualization Group, Red Hat https://clicktime.symantec.com/a/1/QpBj2RntFu4dSMppES6KSQp9ZVvhAKatttH78pTl_WA=?d=12kiPxvxSYRcl6NZxESsHA3TxXXFpt_WZErs3plCmXBhxRSv0U15rzGdpGGpCeSwMY1wO5swkB_Vvzycbtiwa5aBdD-1FdUoaQIPif7noFSFoMgC2e1ufzZQiRTRXgGxT2XD7_8NINSLiJbOjm7gQtRmhLkIXbJdGr3Tn29IqozqySPO--AFa-S-lGmPePW0cRAJ0pcbGtIOsqb1nPOZJMiyRutNANOowl1CnoSSK7yUCoiiInPE6T4wtTosy3tHobiAm6lWo8MXnEX9GOf_7qldHl588OUe2CDuMty5buneMn6iNY0o1iUkgxkXRt5X7UMqQF8L9DkS_4L62HUasjmcjAxkaqXtSO2zyHgXUPkCvB6W3CkVkZbI&u=http%3A%2F%2Fpeople.redhat.com%2F~rjones
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