openstack
/
diskimage-builder
Code Issues Proposed changes

Merge "Use networkx for digraph"

This commit is contained in:
Jenkins 2017-05-27 10:10:31 +00:00 committed by Gerrit Code Review
parent 68393b6f9f 75817ef205
commit 3b85cad420
14 changed files with 202 additions and 76 deletions
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89
diskimage_builder/block_device/blockdevice.py
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@ -20,6 +20,8 @@ import shutil
import sys
import yaml
import networkx as nx
from stevedore import extension
from diskimage_builder.block_device.config import \
@ -27,7 +29,6 @@ from diskimage_builder.block_device.config import \
from diskimage_builder.block_device.exception import \
BlockDeviceSetupException
from diskimage_builder.block_device.utils import exec_sudo
from diskimage_builder.graph.digraph import Digraph
logger = logging.getLogger(__name__)
@ -166,40 +167,86 @@ class BlockDevice(object):
json.dump(state, fd)
def create_graph(self, config, default_config):
logger.debug("Create graph [%s]" % config)
"""Generate configuration digraph
Generate the configuration digraph from the config
:param config: graph configuration file
:param default_config: default parameters (from --params)
:return: tuple with the graph object, nodes in call order
"""
# This is the directed graph of nodes: each parse method must
# add the appropriate nodes and edges.
dg = Digraph()
dg = nx.DiGraph()
for config_entry in config:
if len(config_entry) != 1:
logger.error("Invalid config entry: more than one key "
"on top level [%s]" % config_entry)
raise BlockDeviceSetupException(
"Top level config must contain exactly one key per entry")
# this should have been checked by generate_config
assert len(config_entry) == 1
logger.debug("Config entry [%s]" % config_entry)
cfg_obj_name = list(config_entry.keys())[0]
cfg_obj_val = config_entry[cfg_obj_name]
# As the first step the configured objects are created
# (if it exists)
# Instantiate a "plugin" object, passing it the
# configuration entry
if cfg_obj_name not in self.plugin_manager:
logger.error("Configured top level element [%s] "
"does not exists." % cfg_obj_name)
return 1
raise BlockDeviceSetupException(
("Config element [%s] is not implemented" % cfg_obj_name))
cfg_obj = self.plugin_manager[cfg_obj_name].plugin(
cfg_obj_val, default_config)
# At this point it is only possible to add the nodes:
# adding the edges needs all nodes first.
cfg_obj.insert_nodes(dg)
# Ask the plugin for the nodes it would like to insert
# into the graph. Some plugins, such as partitioning,
# return multiple nodes from one config entry.
nodes = cfg_obj.get_nodes()
for node in nodes:
# would only be missing if a plugin was way out of
# line and didn't put it in...
assert node.name
# ensure node names are unique. networkx by default
# just appends the attribute to the node dict for
# existing nodes, which is not what we want.
if node.name in dg.node:
raise BlockDeviceSetupException(
"Duplicate node name: %s" % (node.name))
logger.debug("Adding %s : %s", node.name, node)
dg.add_node(node.name, obj=node)
# Now that all the nodes exists: add also the edges
for node in dg.get_iter_nodes_values():
node.insert_edges(dg)
# Now find edges
for name, attr in dg.nodes(data=True):
obj = attr['obj']
# Unfortunately, we can not determine node edges just from
# the configuration file. It's not always simply the
# "base:" pointer. So ask nodes for a list of nodes they
# want to point to. *mostly* it's just base: ... but
# mounting is different.
# edges_from are the nodes that point to us
# edges_to are the nodes we point to
edges_from, edges_to = obj.get_edges()
logger.debug("Edges for %s: f:%s t:%s", name,
edges_from, edges_to)
for edge_from in edges_from:
if edge_from not in dg.node:
raise BlockDeviceSetupException(
"Edge not defined: %s->%s" % (edge_from, name))
dg.add_edge(edge_from, name)
for edge_to in edges_to:
if edge_to not in dg.node:
raise BlockDeviceSetupException(
"Edge not defined: %s->%s" % (name, edge_to))
dg.add_edge(name, edge_to)
# this can be quite helpful debugging but needs pydotplus.
# run "dotty /tmp/out.dot"
# XXX: maybe an env var that dumps to a tmpdir or something?
# nx.nx_pydot.write_dot(dg, '/tmp/graph_dump.dot')
# Topological sort (i.e. create a linear array that satisfies
# dependencies) and return the object list
call_order_nodes = nx.topological_sort(dg)
logger.debug("Call order: %s", list(call_order_nodes))
call_order = [dg.node[n]['obj'] for n in call_order_nodes]
call_order = dg.topological_sort()
logger.debug("Call order [%s]" % (list(call_order)))
return dg, call_order
def create(self, result, rollback):

10
diskimage_builder/block_device/level0/localloop.py
View File

@ -48,13 +48,13 @@ class LocalLoop(Digraph.Node):
Digraph.Node.__init__(self, self.name)
self.filename = os.path.join(self.image_dir, self.name + ".raw")
def insert_edges(self, dg):
def get_edges(self):
"""Because this is created without base, there are no edges."""
pass
return ([], [])
def insert_nodes(self, dg):
"""Adds self as a node to the given digraph"""
dg.add_node(self)
def get_nodes(self):
"""Returns nodes for adding to the graph"""
return [self]
@staticmethod
def image_create(filename, size):

16
diskimage_builder/block_device/level1/partition.py
View File

@ -55,11 +55,6 @@ class Partition(Digraph.Node):
self.ptype = int(config['type'], 16) if 'type' in config else 0x83
def __repr__(self):
return "<Partition [%s] on [%s] size [%s] prev [%s]>" \
% (self.name, self.base, self.size,
self.prev_partition.name if self.prev_partition else "UNSET")
def get_flags(self):
return self.flags
@ -72,13 +67,12 @@ class Partition(Digraph.Node):
def get_name(self):
return self.name
def insert_edges(self, dg):
bnode = dg.find(self.base)
assert bnode is not None
dg.create_edge(bnode, self)
def get_edges(self):
edge_from = [self.base]
edge_to = []
if self.prev_partition is not None:
logger.debug("Insert edge [%s]" % self)
dg.create_edge(self.prev_partition, self)
edge_from.append(self.prev_partition.name)
return (edge_from, edge_to)
def create(self, result, rollback):
self.partitioning.create(result, rollback)

7
diskimage_builder/block_device/level1/partitioning.py
View File

@ -84,10 +84,9 @@ class Partitioning(Digraph.Node):
fd.seek(0, 2)
return fd.tell()
def insert_nodes(self, dg):
for part in self.partitions:
logger.debug("Insert node [%s]" % part)
dg.add_node(part)
def get_nodes(self):
# We just add partitions
return self.partitions
def _all_part_devices_exist(self, expected_part_devices):
for part_device in expected_part_devices:

20
diskimage_builder/block_device/level2/mkfs.py
View File

@ -96,15 +96,10 @@ class Filesystem(Digraph.Node):
logger.debug("Filesystem created [%s]" % self)
def __repr__(self):
return "<Filesystem base [%s] name [%s] type [%s]>" \
% (self.base, self.name, self.type)
def insert_edges(self, dg):
logger.debug("Insert edge [%s]" % self)
bnode = dg.find(self.base)
assert bnode is not None
dg.create_edge(bnode, self)
def get_edges(self):
edge_from = [self.base]
edge_to = []
return (edge_from, edge_to)
def create(self, result, rollback):
logger.info("create called; result [%s]" % result)
@ -174,7 +169,8 @@ class Mkfs(object):
fs = Filesystem(self.config)
self.filesystems[fs.get_name()] = fs
def insert_nodes(self, dg):
def get_nodes(self):
nodes = []
for _, fs in self.filesystems.items():
logger.debug("Insert node [%s]" % fs)
dg.add_node(fs)
nodes.append(fs)
return nodes

28
diskimage_builder/block_device/level3/mount.py
View File

@ -45,11 +45,7 @@ class MountPoint(Digraph.Node):
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):
def get_node(self):
global mount_points
if self.mount_point in mount_points:
raise BlockDeviceSetupException(
@ -57,9 +53,9 @@ class MountPoint(Digraph.Node):
% self.mount_point)
logger.debug("Insert node [%s]" % self)
mount_points[self.mount_point] = self
dg.add_node(self)
return self
def insert_edges(self, dg):
def get_edges(self):
"""Insert all edges
After inserting all the nodes, the order of the mounting and
@ -74,7 +70,8 @@ class MountPoint(Digraph.Node):
ensures that during mounting (and umounting) the correct
order is used.
"""
logger.debug("Insert edge [%s]" % self)
edge_from = []
edge_to = []
global mount_points
global sorted_mount_points
if sorted_mount_points is None:
@ -86,11 +83,11 @@ class MountPoint(Digraph.Node):
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)
dep = mount_points[sorted_mount_points[mpi - 1]]
edge_from.append(dep.name)
bnode = dg.find(self.base)
assert bnode is not None
dg.create_edge(bnode, self)
edge_from.append(self.base)
return (edge_from, edge_to)
def create(self, result, rollback):
logger.debug("mount called [%s]" % self.mount_point)
@ -142,12 +139,13 @@ class Mount(object):
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):
def get_nodes(self):
global sorted_mount_points
assert sorted_mount_points is None
nodes = []
for _, mp in self.mount_points.items():
mp.insert_node(dg)
nodes.append(mp.get_node())
return nodes

14
diskimage_builder/block_device/level4/fstab.py
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@ -36,15 +36,13 @@ class Fstab(Digraph.Node):
self.dump_freq = self.config.get('dump-freq', 0)
self.fsck_passno = self.config.get('fsck-passno', 2)
def insert_nodes(self, dg):
logger.debug("Insert node")
dg.add_node(self)
def get_nodes(self):
return [self]
def insert_edges(self, dg):
logger.debug("Insert edge [%s]" % self)
bnode = dg.find(self.base)
assert bnode is not None
dg.create_edge(bnode, self)
def get_edges(self):
edge_from = [self.base]
edge_to = []
return (edge_from, edge_to)
def create(self, result, rollback):
logger.debug("fstab create called [%s]" % self.name)

28
diskimage_builder/block_device/tests/config/bad_edge_graph.yaml Normal file
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@ -0,0 +1,28 @@
- local_loop:
name: image0
- partitioning:
base: image0
name: mbr
label: mbr
partitions:
- flags: [boot, primary]
name: root
base: image0
size: 100%
- mount:
base: mkfs_root
name: mount_mkfs_root
mount_point: /
- fstab:
base: mount_mkfs_root
name: fstab_mount_mkfs_root
fsck-passno: 1
options: defaults
- mkfs:
base: this_is_not_a_node
name: mkfs_root
type: ext4

28
diskimage_builder/block_device/tests/config/duplicate_name.yaml Normal file
View File

@ -0,0 +1,28 @@
- local_loop:
name: this_is_a_duplicate
- partitioning:
base: this_is_a_duplicate
name: root
label: mbr
partitions:
- flags: [boot, primary]
name: root
base: image0
size: 100%
- mount:
base: mkfs_root
name: this_is_a_duplicate
mount_point: /
- fstab:
base: mount_mkfs_root
name: fstab_mount_mkfs_root
fsck-passno: 1
options: defaults
- mkfs:
base: root
name: mkfs_root
type: ext4

8
diskimage_builder/block_device/tests/config/multi_key_node.yaml Normal file
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@ -0,0 +1,8 @@
- mkfs:
name: root_fs
base: root_part
type: xfs
mount:
name: mount_root_fs
base: root_fs
mount_point: /

1
diskimage_builder/block_device/tests/config/simple_graph.yaml
View File

@ -1,6 +1,7 @@
- mkfs:
name: root_fs
base: root_part
type: xfs
- mount:
name: mount_root_fs

1
diskimage_builder/block_device/tests/config/simple_tree.yaml
View File

@ -1,5 +1,6 @@
- mkfs:
name: root_fs
base: root_part
type: xfs
mount:
mount_point: /

27
diskimage_builder/block_device/tests/test_config.py
View File

@ -69,12 +69,22 @@ class TestGraphGeneration(TestConfig):
class TestConfigParsing(TestConfig):
"""Test parsing config file into a graph"""
# test an entry in the config not being a valid plugin
def test_config_bad_plugin(self):
config = self.load_config_file('bad_plugin.yaml')
self.assertRaises(BlockDeviceSetupException,
config_tree_to_graph,
config)
# test a config that has multiple keys for a top-level entry
def test_config_multikey_node(self):
config = self.load_config_file('multi_key_node.yaml')
self.assertRaisesRegexp(BlockDeviceSetupException,
"Config entry top-level should be a single "
"dict:",
config_tree_to_graph,
config)
# a graph should remain the same
def test_graph(self):
graph = self.load_config_file('simple_graph.yaml')
@ -106,6 +116,23 @@ class TestConfigParsing(TestConfig):
class TestCreateGraph(TestGraphGeneration):
# Test a graph with bad edge pointing to an invalid node
def test_invalid_missing(self):
config = self.load_config_file('bad_edge_graph.yaml')
self.assertRaisesRegexp(BlockDeviceSetupException,
"Edge not defined: this_is_not_a_node",
self.bd.create_graph,
config, self.fake_default_config)
# Test a graph with bad edge pointing to an invalid node
def test_duplicate_name(self):
config = self.load_config_file('duplicate_name.yaml')
self.assertRaisesRegexp(BlockDeviceSetupException,
"Duplicate node name: "
"this_is_a_duplicate",
self.bd.create_graph,
config, self.fake_default_config)
# Test digraph generation from deep_graph config file
def test_deep_graph_generator(self):
config = self.load_config_file('deep_graph.yaml')

1
requirements.txt
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@ -2,6 +2,7 @@
# of appearance. Changing the order has an impact on the overall integration
# process, which may cause wedges in the gate later.
Babel!=2.4.0,>=2.3.4 # BSD
networkx>=1.10 # BSD
pbr!=2.1.0,>=2.0.0 # Apache-2.0
PyYAML>=3.10.0 # MIT
flake8<2.6.0,>=2.5.4 # MIT