someone suggest me run yum upgrade ，this make a lot of software upgraded . then the problem sloved, but don't get the reason .

------------------ 原始邮件 ------------------

发件人: "Richard W.M. Jones"<rjones@redhat.com>;

发送时间: 2020年1月9日(星期四) 晚上9:44

收件人: "谢威"<249016681@qq.com>;

抄送: "Tomáš Golembiovský"<tgolembi@redhat.com>;"libguestfs"<libguestfs@redhat.com>;

主题: Re: [Libguestfs] 回复： bug report

On Wed, Jan 08, 2020 at 09:05:55PM +0800, 谢威 wrote:
> > libguestfs: trace: disk_create "/tmp/libguestfsHRQGUn/overlay1.qcow2" "qcow2" -1 "backingfile:/var/tmp/.guestfs-0/appliance.d/root" "backingformat:raw"
> > libguestfs: command: run: qemu-img
> > libguestfs: command: run: \ create
> > libguestfs: command: run: \ -f qcow2
> > libguestfs: command: run: \ -o backing_file=/var/tmp/.guestfs-0/appliance.d/root,backing_fmt=raw
> > libguestfs: command: run: \ /tmp/libguestfsHRQGUn/overlay1.qcow2
> > qemu-img: /tmp/libguestfsHRQGUn/overlay1.qcow2: A regular file was expected by the 'file' driver, but something else was given
> > Could not open backing image to determine size.

There's something really weird going on here with your system.
Could it be that /var/tmp is not readable?

Tomas already suggested doing this:

rm -rf /var/tmp/.guestfs-*

then try to run libguestfs-test-tool again. If it still doesn't work,
have a look at the permissions of files in /var/tmp/.guestfs-0 or if
you see any SELinux audit messages.

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