duplicati/Duplicati/UnitTest/Issue6235.cs

// Copyright (C) 2025, The Duplicati Team
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// 
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using System.IO;
using NUnit.Framework;
using NUnit.Framework.Internal;
using Duplicati.Library.DynamicLoader;

namespace Duplicati.UnitTest
{
    public class Issue6235 : BasicSetupHelper
    {
        [Test]
        [Category("Targeted")]
        public void RepairWithDlistRetries([Values(1, 2)] int keepVersions)
        {
            var testopts = TestOptions.Expand(new
            {
                no_encryption = true,
                number_of_retries = 5,
                retry_delay = "0s",
                keep_versions = keepVersions,
                upload_unchanged_backups = true,
            });

            // Create a file 
            File.WriteAllText(Path.Combine(DATAFOLDER, "a.txt"), "Hello world");

            // Make a backup
            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(c.Backup(new string[] { DATAFOLDER }));

            BackendLoader.AddBackend(new DeterministicErrorBackend());
            var count = 0;
            DeterministicErrorBackend.ErrorGenerator = (action, remotename) =>
            {
                if (action == DeterministicErrorBackend.BackendAction.PutBefore && remotename.Contains(".dlist."))
                {
                    count++;
                    if (count <= 2)
                        return true;
                }
                return false;
            };

            // Make a backup where two attemps to upload the dlist file fails
            using (var c = new Library.Main.Controller(new DeterministicErrorBackend().ProtocolKey + "://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(c.Backup(new string[] { DATAFOLDER }));

            Assert.That(count, Is.EqualTo(3), "Did not retry the dlist upload");

            // Check that repair works
            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(c.Repair());

            // Check that recreate works
            File.Delete(DBFILE);
            DeterministicErrorBackend.ErrorGenerator = (action, remotename) =>
            {
                if (action.IsGetOperation && remotename.Contains(".dblock."))
                    return true;
                return false;
            };

            using (var c = new Library.Main.Controller(new DeterministicErrorBackend().ProtocolKey + "://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(c.Repair());
        }
    }
}