Many thanks.
------------------ Original ------------------
From: "Richard W.M. Jones";<rjones(a)redhat.com&gt;;
Send time: Friday, Mar 19, 2021 6:58 PM
To: "钱非凡"<b3ale693592@foxmail.com>;
Cc: "libguestfs"<libguestfs@redhat.com>;
Subject: Re: [Libguestfs] error invalid partition data while using
libguestfs-tools
On Fri, Mar 19, 2021 at 11:47:09AM +0800, 钱非凡 wrote:
> Thanks for replying, rich.
>
> here are some informations i gathered. the guest is linux (centos) and i find
> out the guest's file system is 'xfs' using `df -hT`:
>
> ```
> $ df -hT
>
Filesystem
Type Size Used Avail Use%
Mounted on
> /dev/mapper/centos-root
xfs 8.0G
1003M 7.1G 13% /
>
devtmpfs
devtmpfs 484M 0
484M 0% /dev
>
tmpfs
tmpfs 496M
0 496M 0% /dev/shm
>
tmpfs
tmpfs 496M 6.8M
489M 2% /run
>
tmpfs
tmpfs 496M
0 496M 0% /sys/fs/cgroup
>
/dev/vda1
xfs 1014M 132M
883M 14% /boot
>
tmpfs
tmpfs 100M
0 100M 0% /run/user/0
> ```
>
> and sgdisk version is 0.8.10:
>
> ```
> $ sgdisk --version
> GPT fdisk (sgdisk) version 0.8.10
> ```
>
> also, i tried the command you gave. it came out the same output:
>
> ```
> $ virt-rescue --ro -d 138093b9b33345c38e58efa014036bd8
> ><rescue> sgdisk /dev/sdb -i 1
> Invalid partition data!
> ```
Yup, basically sgdisk thinks the partition is invalid. Version 0.8.10
is really ancient - from 2014, so I'd start with a newer version.
Rich.
> but strange things happened when i tried some other reports' suggestions:
>
>
https://listman.redhat.com/archives/libguestfs/2016-February/msg00145.html
>
https://listman.redhat.com/archives/libguestfs/2018-November/msg00026.html
>
> i did these things:
>
> 1. set LIBGUESTFS_BACKEND to direct;
> 2. recompile the `libguestfs-1.40.2-10.el7.src.rpm` without the `
> XXXX-RHEL-7-Reject-use-of-libguestfs-winsupport-features-.patch `;
> 3. run the `virt-rescue` command again.
>
> ```
> $ virt-rescue --ro -d 138093b9b33345c38e58efa014036bd8
> ><rescue> sgdisk /dev/sdb -i 1
> Creating new GPT entries.
> Partition #1 does not exist.
> ```
>
> and the command works somehow. apparently, i still dont understand what
> happened indeed. and i have read about the official explanation of
> LIBGUESTFS_BACKEND, is this something to do with libvirt? is it a bug or
> something?
>
>
https://libguestfs.org/libguestfs-test-tool.1.html#
> trying-out-with-without-libvirt
It's unlikely that libguestfs or libvirt or the backend has anything
to do with this.
The partition is corrupt and/or ancient sgdisk has a bug.
Rich.
--
Richard Jones, Virtualization Group, Red Hat
http://people.redhat.com/~rjones
Read my programming and virtualization blog:
http://rwmj.wordpress.com
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