[Libguestfs] [libguestfs/libguestfs] guestfs_copy_in fails with error: copy_in: tar subprocess failed: tar: .: file changed as we read it: errno 0 (Issue #75)

[Nir Soffer]

On Thu, Jan 27, 2022 at 10:58 AM Richard W.M. Jones <rjones at redhat.com> wrote:
>
> On Wed, Jan 26, 2022 at 09:31:14PM -0800, anemade wrote:
> > I am using libguestfs Golang binding APIs(version 1.44)
> > Followed this document https://libguestfs.org/guestfs-golang.3.html to create
> > the disk, add the disk, format the partition, launch the appliance and
> > performing some copy_in and copy_out operations.
> >
> > While doing copy_in, I am seeing this strange issue
> >
> > error: copy_in: tar subprocess failed: tar: .: file changed as we read it:
> > errno 0
> >
> > This issue is not all time reproducible. It comes like 1 out of 10
> > runs. In my case, data is stable while doing copy_in. There is
> > absolutely no change in the data while guestfs_copy_in operation
> > going on.  Any leads to issue or anything that I need to understand
> > for copy_in or copy_out?
>
> Can you share exactly how you are using copy_in?  A small
> reproducer would be good.

Do you copy from GlusterFS mount?

Gluster has this bug:
https://bugzilla.redhat.com/1104618

Which was fixed by adding a new configuration:

    cluster.consistent-metadata on

but the old configuration

    cluster.consistent-metadata no

is still the default in some cases.

Nir