46 lines
1.5 KiB
Python
46 lines
1.5 KiB
Python
# This file is part of Compute
|
|
#
|
|
# Compute is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation, either version 3 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# Compute is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with Compute. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
"""Auxiliary functions for working with disks."""
|
|
|
|
import string
|
|
|
|
|
|
def get_disk_target(
|
|
disks: list[str], prefix: str, *, from_end: bool = False
|
|
) -> str:
|
|
"""
|
|
Return free disk name.
|
|
|
|
.. code-block:: shell-session
|
|
|
|
>>> get_disk_target(['vda', 'vdb'], 'vd')
|
|
'vdc'
|
|
>>> get_disk_target(['vda', 'vdc'], 'vd')
|
|
'vdb'
|
|
>>> get_disk_target(['vda', 'vdd'], 'vd', from_end=True)
|
|
'vdz'
|
|
>>> get_disk_target(['vda', 'hda'], 'hd')
|
|
'hdb'
|
|
|
|
:param disks: List of attached disk names.
|
|
:param prefix: Disk name prefix.
|
|
:param from_end: If True select a drive letter starting from the
|
|
end of the alphabet.
|
|
"""
|
|
index = -1 if from_end else 0
|
|
devs = [d[-1] for d in disks if d.startswith(prefix)]
|
|
return prefix + [x for x in string.ascii_lowercase if x not in devs][index]
|