162 lines
5.7 KiB
Python
162 lines
5.7 KiB
Python
# Copyright 2017 Andreas Florath (andreas@florath.net)
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
# not use this file except in compliance with the License. You may obtain
|
|
# a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations
|
|
# under the License.
|
|
|
|
import logging
|
|
import os
|
|
|
|
from diskimage_builder.block_device.blockdevice \
|
|
import BlockDeviceSetupException
|
|
from diskimage_builder.block_device.tree_config import TreeConfig
|
|
from diskimage_builder.block_device.utils import exec_sudo
|
|
from diskimage_builder.block_device.utils import sort_mount_points
|
|
from diskimage_builder.graph.digraph import Digraph
|
|
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
# There is the need to collect all mount points to be able to
|
|
# sort them in a sensible way.
|
|
mount_points = {}
|
|
# The order of mounting and unmounting is important.
|
|
sorted_mount_points = None
|
|
|
|
|
|
class MountPoint(Digraph.Node):
|
|
|
|
@staticmethod
|
|
def _config_error(msg):
|
|
logger.error(msg)
|
|
raise BlockDeviceSetupException(msg)
|
|
|
|
def __init__(self, mount_base, config):
|
|
# Parameter check
|
|
self.mount_base = mount_base
|
|
for pname in ['base', 'name', 'mount_point']:
|
|
if pname not in config:
|
|
self._config_error("MountPoint config needs [%s]" % pname)
|
|
setattr(self, pname, config[pname])
|
|
Digraph.Node.__init__(self, self.name)
|
|
logger.debug("MountPoint created [%s]" % self)
|
|
|
|
def __repr__(self):
|
|
return "<MountPoint base [%s] name [%s] mount_point [%s]>" \
|
|
% (self.base, self.name, self.mount_point)
|
|
|
|
def insert_node(self, dg):
|
|
global mount_points
|
|
if self.mount_point in mount_points:
|
|
self._config_error("Mount point [%s] specified more than once"
|
|
% self.mount_point)
|
|
logger.debug("Insert node [%s]" % self)
|
|
mount_points[self.mount_point] = self
|
|
dg.add_node(self)
|
|
|
|
def insert_edges(self, dg):
|
|
"""Insert all edges
|
|
|
|
After inserting all the nodes, the order of the mounting and
|
|
umounting can be computed. There is the need to mount
|
|
mount-points that contain other mount-points first.
|
|
Example: '/var' must be mounted before '/var/log'. If not the
|
|
second is not used for files at all.
|
|
|
|
The dependency edge is created in all cases from the base
|
|
element (typically a mkfs) and, if this is not the 'first'
|
|
mount-point, also depend on the mount point before. This
|
|
ensures that during mounting (and umounting) the correct
|
|
order is used.
|
|
"""
|
|
logger.debug("Insert edge [%s]" % self)
|
|
global mount_points
|
|
global sorted_mount_points
|
|
if sorted_mount_points is None:
|
|
logger.debug("Mount points [%s]" % mount_points)
|
|
sorted_mount_points = sort_mount_points(mount_points.keys())
|
|
logger.info("Sorted mount points [%s]" % (sorted_mount_points))
|
|
|
|
# Look for the occurance in the list
|
|
mpi = sorted_mount_points.index(self.mount_point)
|
|
if mpi > 0:
|
|
# If not the first: add also the dependency
|
|
dg.create_edge(mount_points[sorted_mount_points[mpi - 1]], self)
|
|
|
|
bnode = dg.find(self.base)
|
|
assert bnode is not None
|
|
dg.create_edge(bnode, self)
|
|
|
|
def create(self, result, rollback):
|
|
logger.debug("mount called [%s]" % self.mount_point)
|
|
logger.debug("result [%s]" % result)
|
|
rel_mp = self.mount_point if self.mount_point[0] != '/' \
|
|
else self.mount_point[1:]
|
|
mount_point = os.path.join(self.mount_base, rel_mp)
|
|
if not os.path.exists(mount_point):
|
|
# Need to sudo this because of permissions in the new
|
|
# file system tree.
|
|
exec_sudo(['mkdir', '-p', mount_point])
|
|
logger.info("Mounting [%s] to [%s]" % (self.name, mount_point))
|
|
exec_sudo(["mount", result['filesys'][self.base]['device'],
|
|
mount_point])
|
|
|
|
if 'mount' not in result:
|
|
result['mount'] = {}
|
|
result['mount'][self.mount_point] \
|
|
= {'name': self.name, 'base': self.base, 'path': mount_point}
|
|
|
|
if 'mount_order' not in result:
|
|
result['mount_order'] = []
|
|
result['mount_order'].append(self.mount_point)
|
|
|
|
def umount(self, state):
|
|
logger.info("Called for [%s]" % self.name)
|
|
exec_sudo(["umount", state['mount'][self.mount_point]['path']])
|
|
|
|
def cleanup(self, state):
|
|
"""Mount does not need any cleanup."""
|
|
pass
|
|
|
|
def delete(self, state):
|
|
self.umount(state)
|
|
|
|
|
|
class Mount(object):
|
|
|
|
type_string = "mount"
|
|
tree_config = TreeConfig("mount")
|
|
|
|
def _config_error(self, msg):
|
|
logger.error(msg)
|
|
raise BlockDeviceSetupException(msg)
|
|
|
|
def __init__(self, config, params):
|
|
logger.debug("Mounting object; config [%s]" % config)
|
|
self.config = config
|
|
self.params = params
|
|
|
|
if 'mount-base' not in self.params:
|
|
MountPoint._config_error("Mount default config needs 'mount-base'")
|
|
self.mount_base = self.params['mount-base']
|
|
|
|
self.mount_points = {}
|
|
|
|
mp = MountPoint(self.mount_base, self.config)
|
|
self.mount_points[mp.get_name()] = mp
|
|
|
|
def insert_nodes(self, dg):
|
|
global sorted_mount_points
|
|
assert sorted_mount_points is None
|
|
for _, mp in self.mount_points.items():
|
|
mp.insert_node(dg)
|