[Libguestfs] Notes on libguestfs with Ubuntu 12.04 (Precise)
Richard W.M. Jones
rjones at redhat.com
Sat Apr 14 20:49:03 UTC 2012
On Wed, Apr 04, 2012 at 02:08:33PM +0100, Richard W.M. Jones wrote:
> Ubuntu are now supplying a libguestfs package (or to be more accurate,
> they are just copying the Debian package) but it doesn't work out of the box.
> There is a bug in apt which we worked around in febootstrap 3.14, but
> the supplied version of febootstap is only 3.12. Hence you will get
> errors like this during installation:
> febootstrap: aptitude: error: no file was downloaded corresponding to package <some package name>
> and you'll get the same error if you try to build from source.
> The solution is to build febootstrap 3.14:
> cd /tmp
> sudo apt-get build-dep febootstrap
> sudo apt-get install devscripts
> apt-get source febootstrap
> wget http://people.redhat.com/~rjones/febootstrap/files/febootstrap-3.14.tar.gz
> tar zxf febootstrap-3.14.tar.gz
> cd febootstrap-3.14
> rm -rf debian
> cp -a ../febootstrap-3.12/debian .
> vi debian/changelog
> # change the first line: 3.12 -> 3.14
> debuild -i -uc -us -b
> That will create an febootstrap 3.14 .deb file in /tmp which you can
> sudo dpkg -i ../febootstrap_3.14-1_amd64.deb
> Then you can go ahead and use the libguestfs package:
> sudo update-guestfs-appliance
> or compile libguestfs from source.
> There is another problem which you may hit, if you add a completely
> blank disk to libguestfs (this also affects libguestfs-test-tool):
I've found a way around the last problem, which seems to be caused by
the version of qemu-kvm in Ubuntu, not the kernel.
If you compile qemu from source and use that, then it works (for me).
git clone git://git.qemu.org/qemu.git
Then create a 'qemu.wrapper' file containing (edited):
exec $qemudir/x86_64-softmmu/qemu-system-x86_64 -L $qemudir/pc-bios "$@"
chmod +x qemu.wrapper
(See: http://libguestfs.org/guestfs.3.html#qemu_wrappers )
Then set the environment variable:
Then run libguestfs / virt-tools programs as normal (albeit slower
because it's qemu, not full upstream KVM).
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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