Kenneth Skovhede
0f81b42146
This PR adds support for locking files if the backend supports it. To activate locking, set the option `--file-lock-duration=30D` and the backup will lock the files. If the database is rebuilt with the intention of continuing the backups, use the option `--repair-refresh-lock-info` which will update lock information in the database after recreating the database. The locking works by asking the backend to lock files after a backup has completed. The implementation keeps track of which files are currently assigned a lock and prevents attempting to delete the files that are currently locked. Note that the bucket should not have a default lock policy as Duplicati needs to finish the backup before the locking is applied. In this initial version, Azure Blob Storage, B2, S3 and iDrive are supported with locking. The CLI is updated to allow setting locks on a specific version. The backend tool is updated to allow setting locks on specific files.
89 lines
3.5 KiB
C#
89 lines
3.5 KiB
C#
// Copyright (C) 2025, The Duplicati Team
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// https://duplicati.com, hello@duplicati.com
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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using System;
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using System.Threading;
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using System.Threading.Tasks;
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using Duplicati.Library.Interface;
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namespace Duplicati.Library.Main.Backend;
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#nullable enable
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partial class BackendManager
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{
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/// <summary>
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/// Represents a pending get object lock operation
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/// </summary>
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private class GetObjectLockOperation : PendingOperation<DateTime?>
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{
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/// <summary>
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/// The log tag for this class
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/// </summary>
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private static readonly string LOGTAG = Logging.Log.LogTagFromType<GetObjectLockOperation>();
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/// <summary>
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/// The remote filename to check for lock
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/// </summary>
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public override string RemoteFilename { get; }
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/// <summary>
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/// The operation type
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/// </summary>
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public override BackendActionType Operation => BackendActionType.GetObjectLock;
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/// <summary>
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/// Creates a new GetObjectLockOperation
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/// </summary>
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/// <param name="remoteName">The remote file name to check</param>
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/// <param name="context">The execution context</param>
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/// <param name="cancelToken">The cancellation token</param>
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public GetObjectLockOperation(string remoteName, ExecuteContext context, CancellationToken cancelToken)
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: base(context, true, cancelToken)
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{
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RemoteFilename = remoteName;
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}
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/// <inheritdoc />
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public override async Task<DateTime?> ExecuteAsync(IBackend backend, CancellationToken cancelToken)
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{
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if (backend is not ILockingBackend lockingBackend)
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throw new NotSupportedException("Backend does not support object locking operations");
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Context.Statwriter.SendEvent(BackendActionType.GetObjectLock, BackendEventType.Started, RemoteFilename, 0);
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try
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{
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return await lockingBackend.GetObjectLockUntilAsync(RemoteFilename, cancelToken).ConfigureAwait(false);
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}
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catch (Exception ex)
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{
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Logging.Log.WriteWarningMessage(LOGTAG, "GetObjectLockFailed", ex, "Failed to get object lock for {0}: {1}", RemoteFilename, ex.Message);
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throw;
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}
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finally
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{
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Context.Statwriter.SendEvent(BackendActionType.GetObjectLock, BackendEventType.Completed, RemoteFilename, 0);
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}
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}
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}
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}
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