[Libguestfs] question about guestfs_add_drive_opts_blocksize

[Richard W.M. Jones]

On Mon, Mar 29, 2021 at 07:01:10PM +0100, Richard W.M. Jones wrote:
> On Mon, Mar 29, 2021 at 10:44:55AM -0600, Stefan Fiala wrote:
> > gcc create_disk.c -L lib/.libs -lguestfs -o create_disk
> > builds but when run:-
> > libguestfs: error: add_drive: unknown option 12 (this can happen if a program is compiled against a newer version of libguestfs, then dynamically linked to an older version)
> >
> > Doesn't that come from using /usr/lib/x86_64-linux-gnu/libguestfs.so [an old (installed) version)?
> 
> Did you use the ./run script when running the program?

Also for further information try setting:

export LIBGUESTFS_DEBUG=1
export LIBGUESTFS_TRACE=1

Rich.

> Rich.
> 
> > There is only a static library in my build tree:- lib/.libs/libguestfs.a
> > [I'm not much good at messing with shared/static libraries]
> > Stefan
> > 
> > > On 03/26/2021 10:19 AM Richard W.M. Jones <rjones at redhat.com> wrote:
> > > 
> > >  
> > > On Fri, Mar 26, 2021 at 09:57:47AM -0600, Stefan Fiala wrote:
> > > > I want to do some work with 4K blocksize devices (real and virtual). I found
> > > > examples/create_disk.c
> > > > then found it didn't contain the blocksize option. I have Ubuntu 20.04
> > > > guestfish version 1.40.2. I investigated and found a recent checkin 1.45.2 that
> > > > adds this option.
> > > 
> > > Do you mean this one?
> > > 
> > >   commit 94843f155aa72d75d693a96f7b11ceb7558837f0
> > >   Author: Nikolay Ivanets
> > >   Date:   Tue Feb 11 16:12:24 2020 +0200
> > > 
> > >     lib: add support for disks with 4096 bytes sector size
> > > 
> > > > I then rebuilt libguestfs from scratch using tag V1.45.2.
> > > > I noted the warning not to "make install" it and stopped.
> > > >  
> > > > I don't see how to build create_disk.c against a libguesfs.a version 1.45.2.
> > > > The faq/etc talk about running a self-compiled program using ./run but not how
> > > > to make such a program with a different version.
> > > 
> > > You can just do something like:
> > > 
> > >   gcc create_disk.c -L lib/.libs -lguestfs -o create_disk
> > >   ./run ./create_disk
> > > 
> > > Rich.
> > > 
> > > -- 
> > > Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
> > > Read my programming and virtualization blog: http://rwmj.wordpress.com
> > > virt-top is 'top' for virtual machines.  Tiny program with many
> > > powerful monitoring features, net stats, disk stats, logging, etc.
> > > http://people.redhat.com/~rjones/virt-top
> 
> -- 
> Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> virt-builder quickly builds VMs from scratch
> http://libguestfs.org/virt-builder.1.html
> 
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-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-p2v converts physical machines to virtual machines.  Boot with a
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http://libguestfs.org/virt-v2v