133 lines
4.9 KiB
Python
133 lines
4.9 KiB
Python
#!/usr/bin/env python3
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import argparse
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import os
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import subprocess
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import yaml
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def load_and_validate_config_dir(config_dir):
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if not os.path.isdir(config_dir):
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raise ValueError(f"{config_dir} is not a directory")
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return [
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load_and_validate_config_file(os.path.join(config_dir, file))
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for file in os.listdir(config_dir)
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]
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def load_and_validate_config_file(config_file_path):
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if not os.path.isfile(config_file_path):
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raise ValueError(f"{config_file_path} is not a file")
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with open(config_file_path, encoding="utf-8") as config_file:
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config = yaml.safe_load(config_file)
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for key in [
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"dataset",
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"aws_bucket_keys_file",
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"aws_bucket_endpoint",
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"aws_bucket_prefix",
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"restic_password_file",
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"restic_keep_daily",
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"restic_keep_monthly",
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]:
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if key not in config:
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raise KeyError(f"{key} must be present in {config_file_path}")
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for file in [config["restic_password_file"], config["aws_bucket_keys_file"]]:
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if not os.path.isfile(file):
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raise ValueError(f"{file} is not a file")
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return config
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def get_volume_datasets(root_dataset):
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zfs_list = subprocess.getoutput(
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f"zfs list -H -r {root_dataset} -o name,mountpoint"
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)
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zfs_list_lines = zfs_list.split('\n')
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zfs_list_lines_items = map(lambda l: l.split(), zfs_list_lines)
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return {
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os.path.relpath(dataset, root_dataset): {
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"dataset": dataset,
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"mountpoint": mountpoint,
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} for dataset, mountpoint in zfs_list_lines_items if os.path.ismount(mountpoint)
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}
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def get_last_daily_snapshot(dataset):
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snapshots = subprocess.getoutput(
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f"zfs list -t snapshot -H -r {dataset} -o name -s creation"
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)
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daily_snapshots = filter(lambda s: s.endswith("_daily"), snapshots.split('\n'))
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last_daily_snapshot = list(daily_snapshots)[-1]
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assert '@' in last_daily_snapshot
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assert last_daily_snapshot.split('@')[0] == dataset
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return last_daily_snapshot
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if __name__ == "__main__":
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parser = argparse.ArgumentParser(description="Backup service data using restic")
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parser.add_argument("--config-dir", type=str, default="/etc/restic-batch.d",
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help="Path to directory with YAML config files")
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args = parser.parse_args()
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config_list = load_and_validate_config_dir(args.config_dir)
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for config in config_list:
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volume_datasets = get_volume_datasets(config["dataset"])
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for volume, properties in volume_datasets.items():
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properties["snapshot"] = get_last_daily_snapshot(properties["dataset"])
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config["volume_datasets"] = volume_datasets
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for config in config_list:
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for volume, properties in config["volume_datasets"].items():
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snapshot = properties["snapshot"]
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mountpoint = properties["mountpoint"]
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backup_path = os.path.normpath(
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os.path.join("/", "mnt", os.path.relpath(mountpoint, "/"))
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)
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bucket_name = config["aws_bucket_prefix"]
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if volume != ".":
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bucket_name = f"{bucket_name}---{volume.replace('/', '---')}"
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bucket_repo = f"s3:https://{config['aws_bucket_endpoint']}/{bucket_name}"
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restic_cmd_base = [
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"/usr/local/bin/restic",
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"--password-file", config["restic_password_file"],
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"--repo", bucket_repo,
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"--option", "s3.storage-class=ONEZONE_IA",
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]
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with open(config["aws_bucket_keys_file"], encoding="utf-8") as keys_file:
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aws_keys = yaml.safe_load(keys_file)
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environ = {**os.environ, **aws_keys}
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print(f"Backing up {bucket_name} : {snapshot}", flush=True)
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subprocess.run(["/usr/sbin/zfs", "clone",
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"-o", f"mountpoint={backup_path}",
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snapshot, "rpool/restic"],
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check=True,
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)
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try:
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try:
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subprocess.run(restic_cmd_base + ["snapshots"], env=environ, check=True)
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except subprocess.CalledProcessError:
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subprocess.run(restic_cmd_base + ["init"], env=environ, check=True)
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subprocess.run(restic_cmd_base + ["backup", "."],
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cwd=backup_path, env=environ, check=True)
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subprocess.run(
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restic_cmd_base + ["forget", "--prune",
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"--keep-daily", config["restic_keep_daily"],
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"--keep-monthly", config["restic_keep_monthly"]],
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env=environ, check=True,
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)
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subprocess.run(restic_cmd_base + ["check"], env=environ, check=True)
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finally:
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subprocess.run(["/usr/sbin/zfs", "destroy", "rpool/restic"], check=True)
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