cleanup dockerimg spc

cleanup.py

import os
import sys
import stat
import gi
gi.require_version('OSTree', '1.0')
from gi.repository import Gio, GLib, OSTree

repo = OSTree.Repo.new(Gio.File.new_for_path("/ostree/repo"))
repo.open(None)

refs = {}
app_refs = []
prefix = "dockerimg-"

def _get_commit_metadata (repo, rev, key):
    commit = repo.load_commit(rev)[1]
    metadata = commit.get_child_value(0)
    if key not in metadata.keys():
        return None
    return metadata[key]

for i in repo.list_refs()[1]:
    if i.startswith(prefix):
        if len(i) == len(prefix) + 64:
            refs[i] = False
        else:
            app_refs.append(i)

def visit(rev):
    commit = repo.resolve_rev(rev, False)[1]
    layer = _get_commit_metadata (repo, commit, "docker.layer")
    refs["%s%s" % (prefix, layer)] = True
    parent = _get_commit_metadata (repo, commit, "docker.parent")
    if parent:
        visit(parent)


for app in app_refs:
    visit(app)

for k, v in refs.items():
    print("%s > %s" % ( k, v))
    if not v:
        ref = OSTree.parse_refspec(k)
        print("Deleting %s", k)
        repo.set_ref_immediate(ref[1], ref[2], None)