def init_vg(group, block_dev):
"""Initialize volume group.
:param group:
Name of the LVM Volume Group.
:type group:
``str``
:param block_dev:
LVM Physical Volume device backing the Volume Group
:type block_dev:
``str``
"""
# Can we see the Volume Group now that we have the block device? If
# so, we are done.
try:
lvm.vgactivate(group)
return
except subproc.CalledProcessError:
# The Volume group doesn't exist, more work to do
pass
# Create Physical Volume backend
lvm.pvcreate(device=block_dev)
# Create a Volume Group using the above Physical Volume
lvm.vgcreate(group, device=block_dev)
# Activate this Volume Group
lvm.vgactivate(group)
def test_vgcreate(self):
"""Test LVM Volume Group creation"""
lvm.vgcreate('some_group', 'some_blockdev')
treadmill.subproc.check_call.assert_called_with([
'lvm',
'vgcreate',
'--autobackup',
'n',
'some_group',
'some_blockdev',
])