# Copyright 2019 Canonical, Ltd.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import logging
import pyudev
from probert.utils import sane_block_devices
log = logging.getLogger('probert.filesystems')
def get_device_filesystem(device):
# extract ID_FS_* keys into dict, dropping leading ID_FS
return {k.replace('ID_FS_', ''): v
for k, v in device.items() if k.startswith('ID_FS_')}
def probe(context=None):
""" Capture detected filesystems found on discovered block devices. """
filesystems = {}
if not context:
context = pyudev.Context()
for device in sane_block_devices(context):
# Ignore block major=1 (ramdisk) and major=7 (loopback)
# these won't ever be used in recreating storage on target systems.
if device['MAJOR'] not in ["1", "7"]:
fs_info = get_device_filesystem(device)
# The ID_FS_ udev values come from libblkid, which contains code to
# recognize lots of different things that block devices or their
# partitions can contain (filesystems, lvm PVs, bcache, ...). We
# only want to report things that are mountable filesystems here,
# which libblkid conveniently tags with ID_FS_USAGE=filesystem.
# Swap is a bit of a special case because it is not a mountable
# filesystem in the usual sense, but subiquity still needs to
# generate mount actions for it.
if fs_info.get("USAGE") == "filesystem" or \
fs_info.get("TYPE") == "swap":
filesystems[device['DEVNAME']] = fs_info
return filesystems
