Libguestfs - Jul 2017 - any read/write raw image function or API in Python?

I know there's lots of functions that can access/modify the internal fs of
img or qcow2 through libguestfs.

I want to know is there any library can modify the raw/qcow2 image directly
in Python?

For example, there's function called read_qcow2(), and I can know the
content of tmp.qcow2 through the function read_qcow2().

On Wednesday, 12 July 2017 10:45:35 CEST 陳培泓 wrote:
> I know there's lots of functions that can access/modify the internal fs
of
> img or qcow2 through libguestfs.
> 
> I want to know is there any library can modify the raw/qcow2 image directly
> in Python?
> 
> For example, there's function called read_qcow2(), and I can know the
> content of tmp.qcow2 through the function read_qcow2().
The only library I know for qcow2 is: https://github.com/libyal/libqcow
although it seems to not be fully up-to-date with the state of QEMU's
later additions to the format.

RAW files are just 1:1 representation of disks, so you will need to
read partitions, filesystems, etc directly from there.

-- 
Pino Toscano

libqcow is read-only on qcow files and don't support write

It seems there's none library can parse the qcow format.

2017-07-12 17:24 GMT+08:00 Pino Toscano <ptoscano@redhat.com>:
> On Wednesday, 12 July 2017 10:45:35 CEST 陳培泓 wrote:
> > I know there's lots of functions that can access/modify the
internal fs
> of
> > img or qcow2 through libguestfs.
> >
> > I want to know is there any library can modify the raw/qcow2 image
> directly
> > in Python?
> >
> > For example, there's function called read_qcow2(), and I can know
the
> > content of tmp.qcow2 through the function read_qcow2().
>
> The only library I know for qcow2 is: https://github.com/libyal/libqcow
> although it seems to not be fully up-to-date with the state of QEMU's
> later additions to the format.
>
> RAW files are just 1:1 representation of disks, so you will need to
> read partitions, filesystems, etc directly from there.
>
> --
> Pino Toscano

On Wed, Jul 12, 2017 at 04:45:35PM +0800, 陳培泓 wrote:
> I know there's lots of functions that can access/modify the internal fs
of
> img or qcow2 through libguestfs.
> 
> I want to know is there any library can modify the raw/qcow2 image directly
> in Python?
libguestfs can do this, eg. using:
http://libguestfs.org/guestfs.3.html#guestfs_pread_device
http://libguestfs.org/guestfs.3.html#guestfs_pwrite_device

Another way might be to use the ‘qemu-io’ utility from qemu.

Rich.
> For example, there's function called read_qcow2(), and I can know the
> content of tmp.qcow2 through the function read_qcow2().
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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
libguestfs lets you edit virtual machines.  Supports shell scripting,
bindings from many languages.  http://libguestfs.org