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backup: automatically take a full backup when the sum of the increments get very large

This commit is contained in:
Joshua Tauberer 2014-08-11 11:38:32 +00:00
parent b6713d9a17
commit f66914d634
1 changed files with 10 additions and 1 deletions
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11
management/backup.py
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@ -10,7 +10,7 @@
# 4) The backup directory is compressed into a single file using tar.
# 5) That file is encrypted with a long password stored in backup/secret_key.txt.
import sys, os, os.path, shutil
import sys, os, os.path, shutil, glob
from utils import exclusive_process, load_environment, shell
@ -31,6 +31,15 @@ os.makedirs(backup_dir, exist_ok=True)
# will fail.
if len(os.listdir(backup_duplicity_dir)) == 0:
full_backup = True
else:
# When the size of incremental backups exceeds the size of existing
# full backups, take a new full backup. We want to avoid full backups
# because they are costly to synchronize off-site.
full_sz = sum(os.path.getsize(f) for f in glob.glob(backup_duplicity_dir + '/*-full.*'))
inc_sz = sum(os.path.getsize(f) for f in glob.glob(backup_duplicity_dir + '/*-inc.*'))
# (n.b. not counting size of new-signatures files because they are relatively small)
if inc_sz > full_sz * 1.5:
full_backup = True
# Stop services.
shell('check_call', ["/usr/sbin/service", "dovecot", "stop"])