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55 lines
1.8 KiB
Python
55 lines
1.8 KiB
Python
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#!/usr/bin/python3
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# This script performs a backup of all user data:
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# 1) System services are stopped while a copy of user data is made.
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# 2) An incremental backup is made using rdiff-backup into the
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# directory STORAGE_ROOT/backup/rdiff-history. This directory
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# will contain the latest files plus a complete history for
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# all prior backups.
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# 3) The stopped services are restarted.
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# 4) The backup directory is compressed into a single file using tar.
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# 5) That file is encrypted with a long password stored in backup/secret_key.txt.
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import os, os.path, subprocess
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from utils import exclusive_process, load_environment
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env = load_environment()
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exclusive_process("backup")
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# Ensure the backup directory exists.
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backup_dir = os.path.join(env["STORAGE_ROOT"], 'backup')
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rdiff_backup_dir = os.path.join(backup_dir, 'rdiff-history')
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os.makedirs(backup_dir, exist_ok=True)
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# Stop services.
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subprocess.check_call(["service", "dovecot", "stop"])
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subprocess.check_call(["service", "postfix", "stop"])
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# Update the backup directory which stores increments.
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try:
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subprocess.check_call([
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"rdiff-backup",
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"--exclude", backup_dir,
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env["STORAGE_ROOT"],
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rdiff_backup_dir])
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except subprocess.CalledProcessError:
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pass
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# Start services.
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subprocess.check_call(["service", "dovecot", "start"])
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subprocess.check_call(["service", "postfix", "start"])
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# Tar the rdiff-backup directory into a single file encrypted using the backup private key.
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os.system(
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"tar -zcC %s . | openssl enc -aes-256-cbc -a -salt -in /dev/stdin -out %s -pass file:%s"
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%
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( rdiff_backup_dir,
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os.path.join(backup_dir, "latest.tgz.enc"),
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os.path.join(backup_dir, "secret_key.txt"),
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))
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# The backup can be decrypted with:
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# openssl enc -d -aes-256-cbc -a -in latest.tgz.enc -out /dev/stdout -pass file:secret_key.txt | tar -z
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