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'''This module implements a package management scheme for all images'''
__revision__ = '$Revision$'
from copy import deepcopy
from re import compile as regcompile
from Bcfg2.Server.Plugin import Plugin, PluginInitError, PluginExecutionError, DirectoryBacked, XMLFileBacked
class PackageEntry(XMLFileBacked):
'''PackageEntry is a set of packages and locations for a single image'''
__identifier__ = 'image'
rpm = regcompile('^(?P<name>[\w\+\d\.]+(-[\w\+\d\.]+)*)-(?P<version>[\w\d\.]+-([\w\d\.]+))\.(?P<arch>\w+)\.rpm$')
def Index(self):
'''Build internal data structures'''
XMLFileBacked.Index(self)
self.packages = {}
for location in self.entries:
for pkg in location.getchildren():
if pkg.attrib.has_key("simplefile"):
self.packages[pkg.get('name')] = deepcopy(pkg.attrib)
# most attribs will be set from pkg
self.packages[pkg.get('name')]['uri'] = "%s/%s" % (location.get('uri'), pkg.get('simplefile'))
elif pkg.attrib.has_key("file"):
mdata = self.rpm.match(pkg.get('file'))
if not mdata:
print "failed to rpm match %s" % (pkg.get('file'))
continue
pkgname = mdata.group('name')
self.packages[pkgname] = mdata.groupdict()
self.packages[pkgname]['file'] = pkg.get('file')
self.packages[pkgname]['uri'] = location.get('uri')
self.packages[pkgname]['type'] = 'rpm'
else:
self.packages[pkg.get('name')] = pkg.attrib
class PackageDir(DirectoryBacked):
'''A directory of package files'''
__child__ = PackageEntry
class Pkgmgr(Plugin):
'''This is a generator that handles package assignments'''
__name__ = 'Pkgmgr'
__version__ = '$Id$'
__author__ = 'bcfg-dev@mcs.anl.gov'
def __init__(self, core, datastore):
Plugin.__init__(self, core, datastore)
try:
self.pkgdir = PackageDir(self.data, self.core.fam)
except OSError:
self.LogError("Pkgmgr: Failed to load package indices")
raise PluginInitError
def FindHandler(self, entry):
'''Non static mechanism of determining entry provisioning'''
if entry.tag != 'Package':
raise PluginExecutionError, (entry.tag, entry.get('name'))
return self.LocatePackage
def LocatePackage(self, entry, metadata):
'''Locates a package entry for particular metadata'''
pkgname = entry.get('name')
if self.pkgdir.entries.has_key("%s.xml" % metadata.hostname):
pkglist = self.pkgdir["%s.xml" % metadata.hostname]
if pkglist.packages.has_key(pkgname):
entry.attrib.update(pkglist.packages[pkgname])
return
elif not self.pkgdir.entries.has_key("%s.xml" % metadata.image):
self.LogError("Pkgmgr: no package index for image %s" % metadata.image)
raise PluginExecutionError, ("Image", metadata.image)
pkglist = self.pkgdir["%s.xml" % (metadata.image)]
if pkglist.packages.has_key(pkgname):
pkg = pkglist.packages[pkgname]
if pkg.get('type', None) == 'rpm':
entry.attrib.update({'url':"%s/%s" % (pkg['uri'], pkg['file']), 'version':pkg['version']})
else:
entry.attrib.update(pkg)
else:
raise PluginExecutionError, ("Package", pkgname)
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