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#!/usr/bin/python
# this is a example how to access the build dependencies of a package
import apt_pkg
import sys
import sets # only needed for python2.3, python2.4 supports this naively
def get_source_pkg(pkg, records, depcache):
""" get the source package name of a given package """
version = depcache.GetCandidateVer(pkg)
if not version:
return None
file, index = version.FileList.pop(0)
records.Lookup((file, index))
if records.SourcePkg != "":
srcpkg = records.SourcePkg
else:
srcpkg = pkg.Name
return srcpkg
# main
apt_pkg.init()
cache = apt_pkg.GetCache()
depcache = apt_pkg.GetDepCache(cache)
depcache.Init()
records = apt_pkg.GetPkgRecords(cache)
srcrecords = apt_pkg.GetPkgSrcRecords()
# base package that we use for build-depends calculation
if len(sys.argv) < 2:
print "need a package name as argument"
sys.exit(1)
try:
base = cache[sys.argv[1]]
except KeyError:
print "No package %s found" % sys.argv[1]
sys.exit(1)
all_build_depends = sets.Set()
# get the build depdends for the package itself
srcpkg_name = get_source_pkg(base, records, depcache)
print "srcpkg_name: %s " % srcpkg_name
if not srcpkg_name:
print "Can't find source package for '%s'" % pkg.Name
srcrec = srcrecords.Lookup(srcpkg_name)
if srcrec:
print "Files:"
print srcrecords.Files
bd = srcrecords.BuildDepends
print "build-depends of the package: %s " % bd
for b in bd:
all_build_depends.add(b[0])
# calculate the build depends for all dependencies
depends = depcache.GetCandidateVer(base).DependsList
for dep in depends["Depends"]: # FIXME: do we need to consider PreDepends?
pkg = dep[0].TargetPkg
srcpkg_name = get_source_pkg(pkg, records, depcache)
if not srcpkg_name:
print "Can't find source package for '%s'" % pkg.Name
continue
srcrec = srcrecords.Lookup(srcpkg_name)
if srcrec:
#print srcrecords.Package
#print srcrecords.Binaries
bd = srcrecords.BuildDepends
#print "%s: %s " % (srcpkg_name, bd)
for b in bd:
all_build_depends.add(b[0])
print "\n".join(all_build_depends)
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