73 lines
1.9 KiB
Python
73 lines
1.9 KiB
Python
"""Module defining a Docker volume-based spec."""
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from .spec import Spec
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from typing import Union
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from pathlib import Path
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from datetime import datetime
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import subprocess
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class VolumeSpec(Spec):
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"""A spec for backing up a Docker volume."""
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_SKEL = {
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"volume": None,
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"image": "alpine:latest",
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"command": "tar -czf '/to/{filename}' .",
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}
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def __init__(
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self,
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name: str,
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volume: str,
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image: str,
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destination: Union[str, Path],
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limit: int,
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command: str,
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extension: str,
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notify=None,
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):
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"""Initialize a new VolumeSpec object.
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Args:
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name: name of the spec
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volume: Docker volume to back up
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image: base image to use to run backup command
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destination: where to store the backup files
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limit: max backup files to keep
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command: backup command to run within the base image
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extension: file extension of the backup files
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notify: Notifier object
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"""
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super().__init__(name, destination, limit, extension, notify)
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self.volume = volume
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self.image = image
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self.command = command
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def backup(self):
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"""Create a new backup."""
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# Remove excess backups
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self.remove_backups()
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# Run actual backup command
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filename = "{}.{}".format(
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datetime.now().strftime("%Y-%m-%d_%H-%M-%S"), self.extension
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)
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base_cmd = "docker run --rm -v '{}:/from' -v '{}:/to' -w /from '{}' {}"
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process = subprocess.run(
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base_cmd.format(
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self.volume,
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self.destination,
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self.image,
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self.command.format(
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filename=filename,
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),
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),
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shell=True,
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)
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if self.notifier:
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self.notifier.notify("backup", self.name, process.returncode)
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