158 lines
5.1 KiB
Python
Executable file
158 lines
5.1 KiB
Python
Executable file
#!/usr/bin/python -W ignore::DeprecationWarning
|
|
|
|
# Script to manage S3-stored backups
|
|
|
|
import base64
|
|
import glob
|
|
import md5
|
|
import os
|
|
import secrets
|
|
import sys
|
|
import time
|
|
|
|
from subprocess import *
|
|
|
|
from boto.s3.connection import S3Connection
|
|
from boto.s3.key import Key
|
|
import boto.exception
|
|
|
|
def open_s3(accesskey, sharedkey):
|
|
return S3Connection(accesskey, sharedkey)
|
|
|
|
def iter_backup_buckets(conn, name=None):
|
|
"""Yields an iterator of buckets that probably have backups in them."""
|
|
|
|
bucket_prefix = secrets.accesskey.lower() + '-bkup-'
|
|
if name:
|
|
bucket_prefix += name
|
|
|
|
buckets = conn.get_all_buckets()
|
|
|
|
for bucket in buckets:
|
|
if bucket.name.startswith(bucket_prefix):
|
|
yield bucket
|
|
|
|
def list_backups(bucket):
|
|
"""Returns a dict of backups in a bucket, with dicts of:
|
|
{hostname (str):
|
|
{Backup number (int):
|
|
{'date': Timestamp of backup (int),
|
|
'keys': A list of keys comprising the backup,
|
|
'hostname': Hostname (str),
|
|
'backupnum': Backup number (int)
|
|
}
|
|
}
|
|
}
|
|
"""
|
|
|
|
backups = {}
|
|
|
|
for key in bucket.list():
|
|
keyparts = key.key.split('.')
|
|
encrypted = split = tarred = False
|
|
|
|
if keyparts[-1] == 'gpg':
|
|
encrypted = True
|
|
keyparts.pop()
|
|
|
|
if keyparts[-1] != 'tar' and len(keyparts[-1]) is 2:
|
|
split = True
|
|
keyparts.pop()
|
|
|
|
if keyparts[-1] == 'tar':
|
|
tarred = True
|
|
keyparts.pop()
|
|
|
|
backupnum = int(keyparts.pop())
|
|
hostname = '.'.join(keyparts)
|
|
|
|
lastmod = time.strptime(key.last_modified, '%Y-%m-%dT%H:%M:%S.000Z')
|
|
|
|
if hostname in backups.keys():
|
|
if backupnum in backups[hostname].keys():
|
|
backups[hostname][backupnum]['keys'].append(key)
|
|
else:
|
|
backups[hostname][backupnum] = {'keys': [key], 'date': lastmod, 'hostname': hostname, 'backupnum': backupnum}
|
|
else:
|
|
backups[hostname] = {backupnum: {'keys': [key], 'date': lastmod, 'hostname': hostname, 'backupnum': backupnum}}
|
|
|
|
return backups
|
|
|
|
def iter_urls(keyset, expire=86400):
|
|
"""Given a list of keys and an optional expiration time (in seconds),
|
|
returns an iterator of URLs to fetch to reassemble the backup."""
|
|
|
|
for key in keyset:
|
|
yield key.generate_url(expires_in=expire)
|
|
|
|
def make_restore_script(backup, expire=86400):
|
|
"""Returns a quick and easy restoration script to restore the given system,
|
|
requires a backup, and perhaps expire"""
|
|
|
|
myhostname = backup['hostname']
|
|
mybackupnum = backup['backupnum']
|
|
myfilecount = len(backup['keys'])
|
|
myfriendlytime = time.strftime('%Y-%m-%d at %H:%M GMT', backup['date'])
|
|
myexpiretime = time.strftime('%Y-%m-%d at %H:%M GMT', time.gmtime(time.time()+expire))
|
|
myexpiretimestamp = time.time()+expire
|
|
|
|
output = []
|
|
|
|
output.append('#!/bin/sh\n')
|
|
output.append('# Restoration script for %s backup %s,\n' % (myhostname, mybackupnum))
|
|
output.append('# a backup created on %s.\n' % (myfriendlytime))
|
|
output.append('# To use: bash scriptname /path/to/put/the/files\n\n')
|
|
output.append('# WARNING: THIS FILE EXPIRES AFTER %s\n' % (myexpiretime))
|
|
output.append('if [ "`date +%%s`" -gt "%i" ];\n' % (myexpiretimestamp))
|
|
output.append(' then echo "Sorry, but this restore script is too old.";\n')
|
|
output.append(' exit 1;\n')
|
|
output.append('fi\n\n')
|
|
output.append('if [ -z "$1" ];\n')
|
|
output.append(' then echo "Usage: ./scriptname /path/to/restore/to";\n')
|
|
output.append(' exit 1;\n')
|
|
output.append('fi\n\n')
|
|
output.append('# Check the destination\n')
|
|
output.append('if [ ! -d $1 ];\n')
|
|
output.append(' then echo "Target $1 does not exist!";\n')
|
|
output.append(' exit 1;\n')
|
|
output.append('fi\n\n')
|
|
output.append('if [ -n "`ls --almost-all $1`" ];\n')
|
|
output.append(' then echo "Target $1 is not empty!";\n')
|
|
output.append(' exit 1;\n')
|
|
output.append('fi\n\n')
|
|
output.append('# cd to the destination, create a temporary workspace\n')
|
|
output.append('cd $1\n')
|
|
output.append('mkdir .restorescript-scratch\n\n')
|
|
output.append('# retrieve files\n')
|
|
|
|
mysortedfilelist = []
|
|
for key in backup['keys']:
|
|
output.append('wget -O $1/.restorescript-scratch/%s "%s"\n' % (key.name, key.generate_url(expires_in=expire)))
|
|
mysortedfilelist.append('.restorescript-scratch/' + key.name)
|
|
mysortedfilelist.sort()
|
|
|
|
output.append('\n# decrypt files\n')
|
|
output.append('gpg --decrypt-files << EOF\n')
|
|
output.append('\n'.join(mysortedfilelist))
|
|
output.append('\nEOF\n')
|
|
|
|
output.append('\n# join and untar files\n')
|
|
output.append('\ncat .restorescript-scratch/*.tar.?? | tar -xf -\n\n')
|
|
|
|
output.append('\necho "DONE! Have a nice day."\n')
|
|
|
|
return output
|
|
|
|
def main():
|
|
conn = open_s3(secrets.accesskey, secrets.sharedkey)
|
|
|
|
for bucket in iter_backup_buckets(conn, name='olpc'):
|
|
backups = list_backups(bucket)
|
|
|
|
for backup in backups['olpc'].keys():
|
|
print make_restore_script(backups['olpc'][backup])
|
|
sys.exit(0)
|
|
|
|
if __name__ == '__main__':
|
|
main()
|
|
|