diff options
Diffstat (limited to 'build/lib/Bcfg2/Server/Plugins/Deps.py')
-rw-r--r-- | build/lib/Bcfg2/Server/Plugins/Deps.py | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/build/lib/Bcfg2/Server/Plugins/Deps.py b/build/lib/Bcfg2/Server/Plugins/Deps.py new file mode 100644 index 000000000..088f8cdad --- /dev/null +++ b/build/lib/Bcfg2/Server/Plugins/Deps.py @@ -0,0 +1,103 @@ +"""This plugin provides automatic dependency handling.""" +__revision__ = '$Revision$' + +import lxml.etree + +import Bcfg2.Server.Plugin + +class DNode(Bcfg2.Server.Plugin.INode): + """DNode provides supports for single predicate types for dependencies.""" + raw = {'Group':"lambda x:'%s' in x.groups and predicate(x)"} + containers = ['Group'] + + def __init__(self, data, idict, parent=None): + self.data = data + self.contents = {} + if parent == None: + self.predicate = lambda x:True + else: + predicate = parent.predicate + if data.tag in self.raw.keys(): + self.predicate = eval(self.raw[data.tag] % (data.get('name')), {'predicate':predicate}) + else: + raise Exception + mytype = self.__class__ + self.children = [] + for item in data.getchildren(): + if item.tag in self.containers: + self.children.append(mytype(item, idict, self)) + else: + data = [(child.tag, child.get('name')) for child in item.getchildren()] + try: + self.contents[item.tag][item.get('name')] = data + except KeyError: + self.contents[item.tag] = {item.get('name'):data} + +class DepXMLSrc(Bcfg2.Server.Plugin.XMLSrc): + __node__ = DNode + +class Deps(Bcfg2.Server.Plugin.PrioDir, + Bcfg2.Server.Plugin.StructureValidator): + name = 'Deps' + __version__ = '$Id$' + __author__ = 'bcfg-dev@mcs.anl.gov' + __child__ = DepXMLSrc + + def __init__(self, core, datastore): + Bcfg2.Server.Plugin.PrioDir.__init__(self, core, datastore) + Bcfg2.Server.Plugin.StructureValidator.__init__(self) + self.cache = {} + + def HandleEvent(self, event): + self.cache = {} + Bcfg2.Server.Plugin.PrioDir.HandleEvent(self, event) + + def validate_structures(self, metadata, structures): + entries = [] + prereqs = [] + for structure in structures: + for entry in structure.getchildren(): + if (entry.tag, entry.get('name')) not in entries \ + and not isinstance(entry, lxml.etree._Comment): + entries.append((entry.tag, entry.get('name'))) + entries.sort() + entries = tuple(entries) + gdata = list(metadata.groups) + gdata.sort() + gdata = tuple(gdata) + if (entries, gdata) in self.cache: + prereqs = self.cache[(entries, gdata)] + else: + [src.Cache(metadata) for src in self.entries.values()] + + toexamine = list(entries[:]) + while toexamine: + entry = toexamine.pop() + matching = [src for src in self.entries.values() + if src.cache and entry[0] in src.cache[1] + and entry[1] in src.cache[1][entry[0]]] + if len(matching) > 1: + prio = [int(src.priority) for src in matching] + if prio.count(max(prio)) > 1: + self.logger.error("Found conflicting %s sources with same priority for %s, pkg %s" % + (entry[0].lower(), metadata.hostname, entry[1])) + raise Bcfg2.Server.Plugin.PluginExecutionError + index = prio.index(max(prio)) + matching = [matching[index]] + + if not matching: + continue + elif len(matching) == 1: + for prq in matching[0].cache[1][entry[0]][entry[1]]: + if prq not in prereqs and prq not in entries: + toexamine.append(prq) + prereqs.append(prq) + self.cache[(entries, gdata)] = prereqs + + newstruct = lxml.etree.Element("Independent") + for tag, name in prereqs: + try: + lxml.etree.SubElement(newstruct, tag, name=name) + except: + self.logger.error("Failed to add dep entry for %s:%s" % (tag, name)) + structures.append(newstruct) |