apt-packages-origin

#!/usr/bin/python
# Author: Liraz Siri <liraz@turnkeylinux.org>
# list origin of packages

import re
import subprocess

class Policy:
    def __init__(self, name):
        self.name = name
        self.candidate = None
        self.sources = {}

def parse_policies(fh):
    pp = None
    curversion = None

    for line in fh.readlines():
        m = re.match(r'^(\S+?):$', line)
        if m:
            if pp:
                yield pp

            pp = Policy(m.group(1))
            continue

        if not pp:
            continue

        m = re.match(r'^\s+Candidate: (.*)', line)
        if m:
            pp.candidate = m.group(1)
            continue

        if not pp.candidate:
            continue

        line = re.sub(r'^ \*\*\* ', ' ' * 5, line)
        m = re.match(r' {5}(\d.*?) ', line)
        if m:
            curversion = m.group(1)
            continue

        if not curversion:
            continue

        m = re.match(r'^ {8}(?:\d+) (.*?) (.*) ', line)
        if m:
            if curversion not in pp.sources:
                pp.sources[curversion] = m.groups()

    yield pp

def main():
    proc = subprocess.Popen(args="apt-cache policy $(dpkg -l | grep ^ii | awk '{print $2}')", shell=True, bufsize=1, stdout=subprocess.PIPE)

    rows = []
    for pp in parse_policies(proc.stdout):
        if pp.candidate in pp.sources:
            address, component = pp.sources[pp.candidate]
            rows.append([pp.name, address, component])

        else:
            rows.append([pp.name, "", ""])

    proc.wait()

    maxcols= [0] * 2

    for col in range(2):
        maxcols[col] = max([ len(row[col]) for row in rows ])

    fmt = "%%-%ds  %%-%ds  %%s" % (maxcols[0], maxcols[1])
    for row in rows:
        print fmt % tuple(row)

if __name__ == "__main__":
    main()