container_detail.py

#!/usr/bin/env python3 
# Author: SC - silas@p1nk.io
# v0.1 - aka -  Tested to the point it looks like it works

import sys
import json
import tarfile


class dContainer(object):
    def __init__(self, fname):
        self.file_name = fname
        self.manifest = None
        self.config = None
        self.layers = None

        self.load()
        self.parse_manifest()

    def load(self):
        try:
            self.tfile = tarfile.open(sys.argv[1])
        except Exception as e:
            print(e)
            raise e

    def list_files(self):
        for f in self.tfile.getnames():
            yield f

    def print_files(self):
        for f in self.tfile.getnames():
            print(f)

    def check_file_exists(self, fname):
        for f in self.list_files():
            if fname == f:
                return True
    def get_file(self, fname):
        try:
            fdata = self.tfile.extractfile(fname)
            return fdata
        except Exception as e:
            raise e
        return None

    def get_manifest(self):
        if self.check_file_exists("manifest.json"):
            fdata = self.get_file("manifest.json")
            manifest = json.loads(fdata.read())
            return manifest
        return False

    def parse_manifest(self):
        m = self.get_manifest()
        self.manifest = m
        for l in m:
            l_config = l.get('Config', False)
            if l_config != False:
                self.config = json.loads(self.get_file(l_config).read())

            l_repo   = l.get('RepoTags', False)
            l_layers   = l.get('Layers', False)
            if l_layers != False:
                self.layers = l_layers

    def print_config(self):
        print("Architecture: {:>20}".format(self.config.get('architecture', "?")))
        print("Config:")
        for l in self.config.get('history', {}):
            print("    Timestamp: {:>30}:    | {}".format(l.get('created', ''), l.get('created_by', '')))

def main():
    c = dContainer(sys.argv[1])
    c.print_config()



if __name__ == "__main__":
    main()