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