libvirt users - Aug 2021 - Question The order of the output of virsh guestinfo --filesystem

Hi all.

I'm curious about the output order of virsh guestinfo --filesystem.
Is the output random?

E.g
Guest info
```

[root at localhost ~]# lsblk -Jp -o KNAME,FSTYPE,TYPE,MOUNTPOINT,PKNAME,SERIAL
{
 ?? "blockdevices": [
 ????? {"kname": "/dev/sr0", "fstype": null,
"type": "rom",
"mountpoint": null, "pkname": null, "serial":
"drive-scsi0-0-0-0"},
 ????? {"kname": "/dev/vda", "fstype": null,
"type": "disk",
"mountpoint": null, "pkname": null, "serial":
null},
 ????? {"kname": "/dev/vda1", "fstype":
"vfat", "type": "part",
"mountpoint": "/boot/efi", "pkname":
"/dev/vda", "serial": null},
 ????? {"kname": "/dev/vda2", "fstype":
"xfs", "type": "part",
"mountpoint": "/boot", "pkname":
"/dev/vda", "serial": null},
 ????? {"kname": "/dev/vda3", "fstype":
"LVM2_member", "type": "part",
"mountpoint": null, "pkname": "/dev/vda",
"serial": null},
 ????? {"kname": "/dev/vdb", "fstype": null,
"type": "disk",
"mountpoint": null, "pkname": null, "serial":
null},
 ????? {"kname": "/dev/vdb1", "fstype":
"xfs", "type": "part",
"mountpoint": "/mnt/test1", "pkname":
"/dev/vdb", "serial": null},
 ????? {"kname": "/dev/vdb2", "fstype":
"xfs", "type": "part",
"mountpoint": "/mnt/test2", "pkname":
"/dev/vdb", "serial": null},
 ????? {"kname": "/dev/vdb3", "fstype":
"xfs", "type": "part",
"mountpoint": "/mnt/test3", "pkname":
"/dev/vdb", "serial": null},
 ????? {"kname": "/dev/dm-0", "fstype":
"xfs", "type": "lvm",
"mountpoint": "/", "pkname":
"/dev/vda3", "serial": null},
 ????? {"kname": "/dev/dm-1", "fstype":
"swap", "type": "lvm",
"mountpoint": "[SWAP]", "pkname":
"/dev/vda3", "serial": null}
 ?? ]
}

```

virsh guestinfo output.
It is not sorted by? name or total-bytes/used-bytes
```
[root at hpe-apollo80-01-n00 ~]# virsh guestinfo fj-kvm-vm --filesystem
fs.count??????????? : 6
fs.0.name?????????? : dm-0
fs.0.mountpoint???? : /
fs.0.fstype???????? : xfs
fs.0.total-bytes??? : 7946108928
fs.0.used-bytes???? : 3202314240
fs.0.disk.count???? : 1
fs.0.disk.0.alias?? : vda
fs.0.disk.0.device? : /dev/vda3
fs.1.name?????????? : vda2
fs.1.mountpoint???? : /boot
fs.1.fstype???????? : xfs
fs.1.total-bytes??? : 1063256064
fs.1.used-bytes???? : 180252672
fs.1.disk.count???? : 1
fs.1.disk.0.alias?? : vda
fs.1.disk.0.device? : /dev/vda2
fs.2.name?????????? : vda1
fs.2.mountpoint???? : /boot/efi
fs.2.fstype???????? : vfat
fs.2.total-bytes??? : 627900416
fs.2.used-bytes???? : 7065600
fs.2.disk.count???? : 1
fs.2.disk.0.alias?? : vda
fs.2.disk.0.device? : /dev/vda1
fs.3.name?????????? : vdb2
fs.3.mountpoint???? : /mnt/test2
fs.3.fstype???????? : xfs
fs.3.total-bytes??? : 204111872
fs.3.used-bytes???? : 12185600
fs.3.disk.count???? : 1
fs.3.disk.0.alias?? : vdb
fs.3.disk.0.device? : /dev/vdb2
fs.4.name?????????? : vdb3
fs.4.mountpoint???? : /mnt/test3
fs.4.fstype???????? : xfs
fs.4.total-bytes??? : 751706112
fs.4.used-bytes???? : 39084032
fs.4.disk.count???? : 1
fs.4.disk.0.alias?? : vdb
fs.4.disk.0.device? : /dev/vdb3
fs.5.name?????????? : vdb1
fs.5.mountpoint???? : /mnt/test1
fs.5.fstype???????? : xfs
fs.5.total-bytes??? : 99254272
fs.5.used-bytes???? : 6213632
fs.5.disk.count???? : 1
fs.5.disk.0.alias?? : vdb
fs.5.disk.0.device? : /dev/vdb1
```

-- 
Best Regards.
Yiding Liu

On 8/23/21 1:19 PM, liuyd.fnst at fujitsu.com wrote:
> Hi all.
> 
> I'm curious about the output order of virsh guestinfo --filesystem.
> Is the output random?
> virsh guestinfo output.
> It is not sorted by? name or total-bytes/used-bytes
It's in whatever order the guest agent reported. And looking into the
guest agent source code it's parsing /proc/self/mountinfo. So there's no
order guaranteed.

Michal