List openstack freezer backups with datetime and size

list_backups.py

import subprocess
import datetime
import re
import sys

backups = subprocess.check_output(['swift', 'list', sys.argv[1]]).splitlines()

width = None
total = 0

def size_fmt(bytes):
        if bytes > 1024 * 1024 * 1024:
                return "{} GiB".format(bytes / 1024 / 1024 / 1024)
        elif bytes > 1024 * 1024:
                return "{} MiB".format(bytes / 1024 / 1024)
        elif bytes > 1024:
                return "{} KiB".format(bytes / 1024)
        else:
                return "{} Bytes".format(bytes)

for backup in backups:
        if width is None:
                width = len(backup) + 5

        if backup.startswith('tar'):
                continue
        else:
                info = subprocess.check_output(['swift', 'stat', 'freezer_deployer_backup', backup])
                result = re.search('Content Length: (.*)$', info, re.MULTILINE)
                size = int(result.group(1))

                result = re.search('^.*_(.*)_.*$', backup)
                date = datetime.datetime.fromtimestamp(int(result.group(1)))

                print date.strftime('%x %X') + "   " + backup.ljust(width) + " " + size_fmt(size)
                total += size

print "-" * (20 + width + 1 + len(size_fmt(size)))
print "Total:".ljust(width + 20) + " " + size_fmt(total)