duplicati/Duplicati/UnitTest/Issue4693.cs

// Copyright (C) 2026, The Duplicati Team
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//
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// copy of this software and associated documentation files (the "Software"),
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using System;
using System.IO;
using System.Security.Cryptography;
using System.Threading.Tasks;
using Duplicati.Library.Main.Database;
using Duplicati.Library.SQLiteHelper;
using NUnit.Framework;

namespace Duplicati.UnitTest
{
    public class Issue4693 : BasicSetupHelper
    {
        [Test]
        [Category("Targeted")]
        public async Task RunCommandsOriginalAsync()
        {
            var testopts = TestOptions.Expand(new { no_encryption = true, keep_versions = 1, dblock_size = "5mb" });

            File.WriteAllText(Path.Combine(DATAFOLDER, "A.txt"), "A");
            File.WriteAllText(Path.Combine(DATAFOLDER, "B.txt"), "B");
            var buffer = new byte[1024 * 1024 * 12];
            Random.Shared.NextBytes(buffer);
            File.WriteAllBytes(Path.Combine(DATAFOLDER, "b1.bin"), buffer);

            var a_hash = Convert.ToBase64String(SHA256.HashData(File.ReadAllBytes(Path.Combine(DATAFOLDER, "A.txt"))));

            // Backup 1
            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(await c.BackupAsync([DATAFOLDER]));

            File.Delete(Path.Combine(DATAFOLDER, "A.txt"));
            File.WriteAllText(Path.Combine(DATAFOLDER, "C.txt"), "C");

            Random.Shared.NextBytes(buffer);
            File.WriteAllBytes(Path.Combine(DATAFOLDER, "b2.bin"), buffer);

            // Backup 2
            System.Threading.Thread.Sleep(1000); // Ensure different timestamp
            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(await c.BackupAsync([DATAFOLDER]));

            File.WriteAllText(Path.Combine(DATAFOLDER, "A.txt"), "A");
            Random.Shared.NextBytes(buffer);
            File.WriteAllBytes(Path.Combine(DATAFOLDER, "b3.bin"), buffer);

            if (a_hash != Convert.ToBase64String(SHA256.HashData(File.ReadAllBytes(Path.Combine(DATAFOLDER, "A.txt")))))
                throw new Exception("Hash of A.txt changed");

            // Backup 3
            System.Threading.Thread.Sleep(1000); // Ensure different timestamp
            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(await c.BackupAsync([DATAFOLDER]));

            File.Delete(Path.Combine(DATAFOLDER, "b1.bin"));
            File.Delete(Path.Combine(DATAFOLDER, "b2.bin"));

            // Backup 4
            System.Threading.Thread.Sleep(1000); // Ensure different timestamp
            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
            {
                var res = await c.BackupAsync([DATAFOLDER]);
                TestUtils.AssertResults(res);
                Assert.That(res.CompactResults.DeletedFileCount, Is.GreaterThan(0), "Compact was not run");
            }

            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(await c.TestAsync(long.MaxValue));

            // Test we can recrate without errors
            File.Delete(DBFILE);
            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(await c.RepairAsync());

            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(await c.TestAsync(long.MaxValue));
        }

        [Test]
        [Category("Targeted")]
        public async Task RunCommandsSimplifiedAsync()
        {
            var testopts = TestOptions.Expand(new { no_encryption = true, keep_versions = 1, dblock_size = "5mb" });

            File.WriteAllText(Path.Combine(DATAFOLDER, "A.txt"), "A");
            File.WriteAllText(Path.Combine(DATAFOLDER, "B.txt"), "B");

            // Backup 1
            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(await c.BackupAsync([DATAFOLDER]));

            File.Delete(Path.Combine(DATAFOLDER, "A.txt"));
            File.WriteAllText(Path.Combine(DATAFOLDER, "C.txt"), "C");

            // Backup 2
            System.Threading.Thread.Sleep(1000); // Ensure different timestamp
            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(await c.BackupAsync([DATAFOLDER]));

            File.WriteAllText(Path.Combine(DATAFOLDER, "A.txt"), "A");

            // Backup 3
            System.Threading.Thread.Sleep(1000); // Ensure different timestamp
            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(await c.BackupAsync([DATAFOLDER]));

            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(await c.TestAsync(long.MaxValue));

            // Test we can recrate without errors
            File.Delete(DBFILE);
            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(await c.RepairAsync());

            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(await c.TestAsync(long.MaxValue));
        }

        [Test]
        [Category("Targeted")]
        // Use the previous behavior, and ignore deleted blocks
        [TestCase(-1)]
        // Force a temporary table
        [TestCase(0)]
        // Use in-memory cache
        [TestCase(1000)]
        public async Task RunWithCachesAsync(int cacheSize)
        {
            Environment.SetEnvironmentVariable("DUPLICATI_DELETEDBLOCKCACHESIZE", cacheSize.ToString());
            var testopts = TestOptions.Expand(new { no_encryption = true, keep_versions = 1, dblock_size = "5mb" });
            File.WriteAllText(Path.Combine(DATAFOLDER, "A.txt"), "A");
            File.WriteAllText(Path.Combine(DATAFOLDER, "B.txt"), "B");
            // Make sure this volume is not compacted away
            File.WriteAllBytes(Path.Combine(DATAFOLDER, "filler.bin"), new byte[1024 * 1024 * 2]);

            // Backup 1
            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(await c.BackupAsync([DATAFOLDER]));

            using (var db = await SQLiteLoader.LoadConnectionAsync(DBFILE))
            using (var cmd = db.CreateCommand())
            {
                var deletedBlocks = cmd.ExecuteScalarInt64(@"SELECT COUNT(*) FROM ""DeletedBlock""");
                Assert.That(deletedBlocks, Is.EqualTo(0), "DeletedBlock table is not empty");
            }


            File.Delete(Path.Combine(DATAFOLDER, "A.txt"));
            File.WriteAllText(Path.Combine(DATAFOLDER, "C.txt"), "C");

            // Backup 2
            System.Threading.Thread.Sleep(1000); // Ensure different timestamp
            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(await c.BackupAsync([DATAFOLDER]));

            using (var db = await SQLiteLoader.LoadConnectionAsync(DBFILE))
            using (var cmd = db.CreateCommand())
            {
                var deletedBlocks = cmd.ExecuteScalarInt64(@"SELECT COUNT(*) FROM ""DeletedBlock""");
                Assert.That(deletedBlocks, Is.GreaterThan(0), "DeletedBlock table is empty");
            }

            using (var db = await SQLiteLoader.LoadConnectionAsync(DBFILE))
            using (var cmd = db.CreateCommand())
            {
                var deletedBlocks = cmd.ExecuteScalarInt64(@"SELECT COUNT(*) FROM ""DeletedBlock""");
                Assert.That(deletedBlocks, Is.GreaterThan(0), "DeletedBlock table is empty");
            }

            File.WriteAllText(Path.Combine(DATAFOLDER, "A.txt"), "A");

            // Backup 3
            System.Threading.Thread.Sleep(1000); // Ensure different timestamp
            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(await c.BackupAsync([DATAFOLDER]));

            using (var db = await SQLiteLoader.LoadConnectionAsync(DBFILE))
            using (var cmd = db.CreateCommand())
            {
                var alldeletedBlocks = cmd.ExecuteScalarInt64(@"SELECT COUNT(*) FROM ""DeletedBlock""");

                var deletedBlocks = cmd.ExecuteScalarInt64(@"SELECT COUNT(*) FROM ""DeletedBlock"" WHERE ""Hash"" IN (SELECT ""Hash"" FROM ""Block"")");
                if (cacheSize < 0)
                    Assert.That(deletedBlocks, Is.GreaterThan(0), "DeletedBlock table contains no duplicates, but lookup is turned off");
                else
                    Assert.That(deletedBlocks, Is.EqualTo(0), "DeletedBlock table contains duplicates, but lookup is turned on");
            }

            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(await c.TestAsync(long.MaxValue));

            // Test we can recrate without errors
            File.Delete(DBFILE);
            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(await c.RepairAsync());

            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(await c.TestAsync(long.MaxValue));

            Environment.SetEnvironmentVariable("DUPLICATI_DELETEDBLOCKCACHESIZE", null);
        }
    }
}