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""" Pacman backend for :mod:`Bcfg2.Server.Plugins.Packages` """
import os
import tarfile
from Bcfg2.Compat import cPickle
from Bcfg2.Server.Plugins.Packages.Collection import Collection
from Bcfg2.Server.Plugins.Packages.Source import Source
def parse_db_file(pkgfile):
""" Parse a Pacman database file, returning a dictionary with
section headings for keys and lists of strings for values.
(Reference: ``sync_db_read`` in ``lib/libalpm/be_sync.c``)
"""
pkg = {}
section = None
for line in pkgfile:
line = line.strip()
if section is not None:
if not line:
section = None
else:
pkg[section].append(line)
elif len(line) >= 2 and line[0] == line[-1] == '%':
section = line
pkg[section] = []
return pkg
def parse_dep(dep):
""" Parse a Pacman dependency string, returning the package name,
version restriction (or ``None``), and description (or ``None``).
(Reference: ``alpm_dep_from_string`` in ``lib/libalpm/deps.c``)
"""
rest_desc = dep.split(': ', 1)
if len(rest_desc) == 1:
rest, desc = rest_desc[0], None
else:
rest, desc = rest_desc
# Search for '=' last, since '<=' and '>=' are possible.
for symb in ['<', '>', '=']:
idx = rest.find(symb)
if idx >= 0:
name = rest[:idx]
version = rest[idx:]
break
else:
name = rest
version = None
return name, version, desc
class PacCollection(Collection):
""" Handle collections of Pacman sources. This is a no-op object
that simply inherits from
:class:`Bcfg2.Server.Plugins.Packages.Collection.Collection`,
overrides nothing, and defers all operations to :class:`PacSource`
"""
def __init__(self, metadata, sources, cachepath, basepath, debug=False):
# we define an __init__ that just calls the parent __init__,
# so that we can set the docstring on __init__ to something
# different from the parent __init__ -- namely, the parent
# __init__ docstring, minus everything after ``.. -----``,
# which we use to delineate the actual docs from the
# .. autoattribute hacks we have to do to get private
# attributes included in sphinx 1.0 """
Collection.__init__(self, metadata, sources, cachepath, basepath,
debug=debug)
__init__.__doc__ = Collection.__init__.__doc__.split(".. -----")[0]
@property
def __package_groups__(self):
return True
class PacSource(Source):
""" Handle Pacman sources """
#: PacSource sets the ``type`` on Package entries to "pacman"
ptype = 'pacman'
#: The database of pacman repositories is compressed with "gzip"
default_compression = 'gzip'
def __init__(self, basepath, xsource):
self.pacgroups = {}
Source.__init__(self, basepath, xsource)
__init__.__doc__ = Source.__init__.__doc__
def load_state(self):
data = open(self.cachefile, 'rb')
(self.pkgnames, self.deps, self.provides,
self.recommends, self.pacgroups) = cPickle.load(data)
load_state.__doc__ = Source.load_state.__doc__
def save_state(self):
cache = open(self.cachefile, 'wb')
cPickle.dump((self.pkgnames, self.deps, self.provides,
self.recommends, self.pacgroups), cache, 2)
cache.close()
save_state.__doc__ = Source.save_state.__doc__
@property
def urls(self):
""" A list of URLs to the base metadata file for each
repository described by this source. """
if not self.rawurl:
rv = []
for part in self.components:
filename = self.build_filename("%s.db.tar" % part)
for arch in self.arches:
rv.append("%s%s/os/%s/%s" %
(self.url, part, arch, filename))
return rv
else:
raise Exception("PacSource : RAWUrl not supported (yet)")
def read_files(self): # pylint: disable=R0912
bdeps = {}
brecs = {}
bprov = {}
self.pkgnames = set()
self.pacgroups = {}
for fname in self.files:
if not self.rawurl:
barch = [x for x in fname.split('@') if x in self.arches][0]
else:
# RawURL entries assume that they only have one <Arch></Arch>
# element and that it is the architecture of the source.
barch = self.arches[0]
if barch not in bdeps:
bdeps[barch] = {}
brecs[barch] = {}
bprov[barch] = {}
try:
self.debug_log("Packages: try to read %s" % fname)
reader = self.open_file(fname)
tar = tarfile.open(fileobj=reader)
except (IOError, tarfile.TarError):
self.logger.error("Packages: Failed to read file %s" % fname)
raise
packages = {}
for tarinfo in tar:
if not tarinfo.isfile():
continue
prefix = os.path.dirname(tarinfo.name)
if prefix not in packages:
packages[prefix] = {}
pkg = parse_db_file(tar.extractfile(tarinfo))
packages[prefix].update(pkg)
for pkg in packages.values():
pkgname = pkg['%NAME%'][0]
self.pkgnames.add(pkgname)
bdeps[barch][pkgname] = []
brecs[barch][pkgname] = []
if '%DEPENDS%' in pkg:
for dep in pkg['%DEPENDS%']:
dname = parse_dep(dep)[0]
bdeps[barch][pkgname].append(dname)
if '%OPTDEPENDS%' in pkg:
for dep in pkg['%OPTDEPENDS%']:
dname = parse_dep(dep)[0]
brecs[barch][pkgname].append(dname)
if '%PROVIDES%' in pkg:
for dep in pkg['%PROVIDES%']:
dname = parse_dep(dep)[0]
if dname not in bprov[barch]:
bprov[barch][dname] = set()
bprov[barch][dname].add(pkgname)
if '%GROUPS%' in pkg:
for group in pkg['%GROUPS%']:
if group not in self.pacgroups:
self.pacgroups[group] = []
self.pacgroups[group].append(pkgname)
tar.close()
reader.close()
self.process_files(bdeps, bprov, brecs)
read_files.__doc__ = Source.read_files.__doc__
def get_group(self, metadata, group, ptype=None):
try:
return self.pacgroups[group]
except KeyError:
return []
get_group.__doc__ = Source.get_group.__doc__
|
