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import apt_pkg
from apt import Package
from UserDict import UserDict
class Cache(object):
def __init__(self, progress=None):
self.open(progress)
def open(self, progress):
self._cache = apt_pkg.GetCache(progress)
self._depcache = apt_pkg.GetDepCache(self._cache)
self._records = apt_pkg.GetPkgRecords(self._cache)
self._dict = {}
# build the packages dict
for pkg in self._cache.Packages:
# drop stuff with no versions (cruft)
if len(pkg.VersionList) > 0:
self._dict[pkg.Name] = Package(self._cache, self._depcache, self._records, pkg)
def __getitem__(self, key):
return self._dict[key]
def has_key(self, key):
try:
self._dict[key]
except KeyError:
return False
return True
def __len__(self):
return len(self._dict)
def keys(self):
return self._dict.keys()
def Upgrade(self, DistUpgrade=False):
self._depcache.Upgrade(DistUpgrade)
def Commit(self, fprogress, iprogress):
self._depcache.Commit(fprogress, iprogress)
class Filter(object):
def apply(self, pkg):
return True
class MarkedChangesFilter(Filter):
def apply(self, pkg):
if pkg.MarkedInstall() or pkg.MarkedDelete() or pkg.MarkedUpgrade():
return True
else:
return False
class FilteredCache(Cache):
def __len__(self):
return len(self._filtered)
def __getitem__(self, key):
return self._dict[key]
def keys(self):
return self._filtered.keys()
def has_key(self, key):
try:
self._filtered[key]
except KeyError:
return False
return True
def AddFilter(self, filter):
for pkg in self._dict.keys():
if filter.apply(self._dict[pkg]):
self._filtered[pkg] = 1
if __name__ == "__main__":
print "Cache self test"
apt_pkg.init()
#c = Cache()
#print c.has_key("aptitudex")
#p = c["aptitude"]
#print p.Name()
#print len(c)
#for pkg in c.keys():
# x= c[pkg].Name()
c = FilteredCache()
c.Upgrade()
c.AddFilter(MarkedChangesFilter())
for pkg in c.keys():
print c[pkg].Name()
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