43 lines
1.4 KiB
Python
43 lines
1.4 KiB
Python
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from __future__ import annotations
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import os
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import pathlib
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from .shell import BackupException, execute_shell_command
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def get_storage_path(volume_name: str) -> str:
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path = execute_shell_command(
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f"docker volume inspect --format '{{{{ .Mountpoint }}}}' {volume_name}"
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)[0]
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return f"{path}/"
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def get_last_backup_dir(versions_dir: str, volume_name: str, current_backup_dir: str) -> str | None:
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versions = sorted(os.listdir(versions_dir), reverse=True)
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for version in versions:
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candidate = os.path.join(versions_dir, version, volume_name, "files", "")
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if candidate != current_backup_dir and os.path.isdir(candidate):
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return candidate
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return None
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def backup_volume(versions_dir: str, volume_name: str, volume_dir: str) -> None:
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"""Perform incremental file backup of a Docker volume."""
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dest = os.path.join(volume_dir, "files") + "/"
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pathlib.Path(dest).mkdir(parents=True, exist_ok=True)
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last = get_last_backup_dir(versions_dir, volume_name, dest)
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link_dest = f"--link-dest='{last}'" if last else ""
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source = get_storage_path(volume_name)
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cmd = f"rsync -abP --delete --delete-excluded {link_dest} {source} {dest}"
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try:
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execute_shell_command(cmd)
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except BackupException as e:
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if "file has vanished" in str(e):
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print("Warning: Some files vanished before transfer. Continuing.", flush=True)
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else:
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raise
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