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"""
APT backend for :mod:`Bcfg2.Server.Plugins.Packages` using
apt_pkg python bindings.
"""
import apt_pkg
from Bcfg2.Server.Plugins.Packages.Apt import AptCollection, AptSource
class PyaptCollection(AptCollection):
""" Handle collections of PyAPT sources. This is a no-op object
that simply inherits from
:class:`Bcfg2.Server.Plugins.Packages.Apt.AptCollection` and
overrides nothing.
"""
pass
class PyaptSource(AptSource):
""" Handle PyAPT sources """
def read_files(self): # pylint: disable=R0912
bdeps = dict()
brecs = dict()
bprov = dict()
bvers = dict()
self.pkgnames = set()
self.essentialpkgs = set()
for fname in self.files:
barch = self._get_arch(fname)
if barch not in bdeps:
bdeps[barch] = dict()
brecs[barch] = dict()
bprov[barch] = dict()
apt_pkg.init_system()
with apt_pkg.TagFile(fname) as tagfile:
for section in tagfile:
pkgname = section['Package']
if pkgname in bvers:
new = section['Version']
old = bvers[pkgname]
if apt_pkg.version_compare(new, old) <= 0:
continue
self.pkgnames.add(pkgname)
bvers[pkgname] = section['Version']
bdeps[barch][pkgname] = []
brecs[barch][pkgname] = []
if section.find_flag('Essential'):
self.essentialpkgs.add(pkgname)
for dep_type in ['Depends', 'Pre-Depends', 'Recommends']:
dep_str = section.find(dep_type)
if dep_str is None:
continue
vindex = 0
for dep in apt_pkg.parse_depends(dep_str):
if len(dep) > 1:
cdeps = [cdep for (cdep, _, _) in dep]
dyn_dname = "choice-%s-%s-%s" % (pkgname,
barch,
vindex)
vindex += 1
if dep_type == 'Recommends':
brecs[barch][pkgname].append(dyn_dname)
else:
bdeps[barch][pkgname].append(dyn_dname)
bprov[barch][dyn_dname] = set(cdeps)
else:
(raw_dep, _, _) = dep[0]
if dep_type == 'Recommends':
brecs[barch][pkgname].append(raw_dep)
else:
bdeps[barch][pkgname].append(raw_dep)
provides = section.find('Provides')
if provides is not None:
provided_packages = [
pkg
for group in apt_pkg.parse_depends(provides)
for (pkg, _, _) in group]
for dname in provided_packages:
if dname not in bprov[barch]:
bprov[barch][dname] = set()
bprov[barch][dname].add(pkgname)
self.process_files(bdeps, bprov, brecs)
read_files.__doc__ = AptSource.read_files.__doc__
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