check-ubuntu-version-monotonicity

check-ubuntu-version-monotonicity.py

#!/usr/bin/python3
import apt_pkg
import debian.deb822
import gzip
import sys
from io import BytesIO
from ubuntutools.lp.lpapicache import Distribution
from urllib.request import urlopen

COMPONENTS = ["main", "restricted", "universe", "multiverse"]
POCKETS = ["", "-security", "-updates"]

apt_pkg.init_system()


def merge_versions(version_dicts):
    out = {}
    for d in version_dicts:
        for p, v in d.items():
            if p not in out or apt_pkg.version_compare(v, out[p]) > 0:
                out[p] = v
    return out


def get_pocket_component_versions(pocket, component):
    url = (
        f"http://archive.ubuntu.com/ubuntu/dists/{pocket}/{component}/source/Sources.gz"
    )
    print(f"Reading {url}", file=sys.stderr)
    with urlopen(url) as fz, gzip.open(fz) as f:
        return {
            src["Package"]: src["Version"]
            for src in debian.deb822.Sources.iter_paragraphs(BytesIO(f.read()))
        }


def get_release_versions(release):
    return merge_versions(
        get_pocket_component_versions(release + pocket, component)
        for pocket in POCKETS
        for component in COMPONENTS
    )


dist = Distribution("ubuntu")
releases = [series.name for series in dist.series if series.active]
versions = {release: get_release_versions(release) for release in releases}

for new, old in zip(releases[:-1], releases[1:]):
    print(f"Comparing {new}, {old}:")
    for p in sorted(set(versions[new]) & set(versions[old])):
        if apt_pkg.version_compare(versions[new][p], versions[old][p]) < 0:
            print(f"{p} {versions[new][p]} < {versions[old][p]}")
    print()