[Pkg-libvirt-maintainers] Bug#971756: virt-manager: Could not build storage pool: unable to control COW flag, not btrfs: Function not implemented

[Leandro Ramos]

Package: virt-manager
Version: 1:2.2.1-5
Severity: normal

Dear Maintainer,

- Creating a new pool led me to Runtime Error: Could not build storage
pool:
unable to control COW flag, not btrfs: Function not implemented

- Clicked on plus (+) button to create a new pool, named the pool,
selected a
path to create the new pool.

- The output was: Could not build storage pool: unable to control COW
flag in
'my/new/pool/path', not btrfs: Function not implemented

We can see a more detailed log here (output of virt-manager --debug --
nofork):

summary=Error creating pool: Could not build storage pool: unable to
control
COW flag on '/home/lramos/VMs', not btrfs: Function not implemented
details=Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 75, in
cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/createpool.py", line 378,
in
_async_pool_create
    poolobj = pool.install(create=True, meter=meter, build=build)
  File "/usr/share/virt-manager/virtinst/storage.py", line 415, in
install
    raise RuntimeError(errmsg)
RuntimeError: Unable to build storage pool: unable to control COW flag
on
'/home/lramos/VMs', not btrfs: Function not implemented


Thank you very much.



-- System Information:
Debian Release: bullseye/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.8.0-2-amd64 (SMP w/2 CPU threads)
Locale: LANG=pt_BR.UTF-8, LC_CTYPE=pt_BR.UTF-8 (charmap=UTF-8),
LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages virt-manager depends on:
ii  dconf-gsettings-backend [gsettings-backend]  0.38.0-1
ii  gir1.2-gtk-3.0                               3.24.23-1
ii  gir1.2-gtk-vnc-2.0                           1.0.0-1
ii  gir1.2-gtksource-4                           4.8.0-1
ii  gir1.2-libosinfo-1.0                         1.7.1-1
ii  gir1.2-libvirt-glib-1.0                      3.0.0-1
ii  gir1.2-vte-2.91                              0.62.0-3
ii  librsvg2-common                              2.50.0+dfsg-1
ii  python3                                      3.8.2-3
ii  python3-dbus                                 1.2.16-3
ii  python3-gi                                   3.38.0-1
ii  python3-gi-cairo                             3.38.0-1
ii  python3-libvirt                              6.1.0-1+b1
ii  virtinst                                     1:2.2.1-5

Versions of packages virt-manager recommends:
ii  gir1.2-appindicator3-0.1    0.4.92-8
ii  gir1.2-spiceclientglib-2.0  0.38-2
ii  gir1.2-spiceclientgtk-3.0   0.38-2
ii  libvirt-daemon-system       6.6.0-2

Versions of packages virt-manager suggests:
ii  gir1.2-secret-1  0.20.3-1
ii  gnome-keyring    3.36.0-1
pn  python3-guestfs  <none>
pn  ssh-askpass      <none>
ii  virt-viewer      7.0-2

-- no debconf information