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Extract file metadata for DiscUtils-based disc image formats by Copilot · Pull Request #200 · microsoft/RecursiveExtractor · GitHub

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Extract file metadata for DiscUtils-based disc image formats #200

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Extract file metadata for DiscUtils-based disc image formats #200

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8f75a09
Initial plan
Copilot Feb 13, 2026
558034a
Initial plan for disc image metadata extraction
Copilot Feb 13, 2026
f71dea8
Add file metadata extraction for DiscUtils-based disc image formats
Copilot Feb 13, 2026
649794a
Plan: Add Windows filesystem metadata support for disc image formats
Copilot Feb 14, 2026
4cd536e
Add Windows filesystem metadata (NTFS/FAT/WIM) to disc image extraction
Copilot Feb 14, 2026
7913f8d
Address review feedback: improve test comment clarity
Copilot Feb 14, 2026
38439c7
Dispose backing streams and skip entries on extraction failure in Tar…
Copilot Feb 17, 2026
b97c784
Improve ZipSlip sanitization and output-dir checks (#201)
gfs Feb 24, 2026
196a557
Minor Version Dependency Bumps (#204)
gfs Apr 28, 2026
8a14f28
Upgrade SharpCompress to 0.47.4 and migrate extractor APIs to new Ope…
Copilot May 11, 2026
64b24e3
Bump dependencies to latest; upgrade SharpCompress to 0.49.1 (#207)
Copilot Jun 15, 2026
5225358
Merge PR #200 (disc image file metadata) onto current main
gfs Jul 31, 2026
b4552e8
Complete disc image metadata support: fix ISO tests, avoid per-file e…
gfs Jul 31, 2026
f61c96d
Address PR review: doc accuracy, metadata failure isolation, hybrid I…
gfs Jul 31, 2026
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43 changes: 43 additions & 0 deletions README.md
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Expand Up @@ -127,6 +127,49 @@ public string? ParentPath { get; }
public DateTime CreateTime { get; }
public DateTime ModifyTime { get; }
public DateTime AccessTime { get; }
public FileEntryMetadata? Metadata { get; set; }
```
</details>

<details>
<summary>File Metadata</summary>
<br/>
When the source archive or disc image records it, `FileEntry.Metadata` holds additional attributes for the entry. Every property is nullable, and `Metadata` itself is `null` when the format carries no metadata at all, so you can distinguish "not recorded" from a real value.

```csharp
public long? Mode { get; set; } // Unix permission bits
public bool? IsExecutable { get; } // Derived from Mode
public bool? IsSetUid { get; } // Derived from Mode
public bool? IsSetGid { get; } // Derived from Mode
public long? Uid { get; set; } // Unix owner id
public long? Gid { get; set; } // Unix group id
public FileAttributes? FileAttributes { get; set; } // Windows/DOS file attributes
public string? SecurityDescriptorSddl { get; set; } // Windows security descriptor, SDDL form
```

Which properties are populated depends on the format:

| Source | Populated |
| --- | --- |
| TAR, AR/DEB | `Mode`, `Uid`, `Gid` |
| ZIP | `Mode`, when the entry records Unix permissions in its external attributes |
| RAR, 7z | `Mode`, taken from the raw attribute field the archive records: a Unix mode for archives created on Unix, DOS attributes otherwise |
| Ext, XFS, Btrfs, HFS+ (inside VHD/VHDX/VMDK/DMG) | `Mode`, `Uid`, `Gid` |
| ISO 9660 with RockRidge extensions | `Mode`, `Uid`, `Gid`, `FileAttributes` |
| ISO 9660 without RockRidge extensions | `FileAttributes` |
| FAT (inside a disc image) | `FileAttributes` |
| NTFS (inside a disc image) | `FileAttributes`, `SecurityDescriptorSddl` |
| WIM | `FileAttributes`, and `SecurityDescriptorSddl` when the image records one |
| UDF | None; `Metadata` is `null` |

```csharp
foreach (var file in extractor.Extract("path/to/image.vhdx"))
{
if (file.Metadata?.SecurityDescriptorSddl is { } sddl)
{
Console.WriteLine($"{file.FullPath}: {sddl}");
}
}
```
</details>

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8 changes: 4 additions & 4 deletions RecursiveExtractor.Cli.Tests/CliTests/CliTests.cs
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Expand Up @@ -27,19 +27,19 @@ public static TheoryData<string, int> CliArchiveData
{
{ "TestData.zip", 5 },
{ "TestData.7z", 3 },
{ "TestData.tar", 6 },
{ "TestData.tar", 5 },
{ "TestData.rar", 3 },
{ "TestData.rar4", 3 },
{ "TestData.tar.bz2", 6 },
{ "TestData.tar.gz", 6 },
{ "TestData.tar.bz2", 5 },
{ "TestData.tar.gz", 5 },
{ "TestData.tar.xz", 3 },
{ "sysvbanner_1.0-17fakesync1_amd64.deb", 8 },
{ "TestData.a", 3 },
{ "TestData.bsd.ar", 3 },
{ "TestData.iso", 3 },
{ "TestData.vhdx", 3 },
{ "EmptyFile.txt", 1 },
{ "TestDataArchivesNested.zip", RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? 54 : 52 },
{ "TestDataArchivesNested.zip", RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? 51 : 49 },
};
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
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6 changes: 3 additions & 3 deletions RecursiveExtractor.Cli.Tests/RecursiveExtractor.Cli.Tests.csproj
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Expand Up @@ -10,9 +10,9 @@

<ItemGroup>
<PackageReference Include="xunit" Version="2.9.3" />
<PackageReference Include="xunit.runner.visualstudio" Version="3.0.2" />
<PackageReference Include="coverlet.collector" Version="6.0.4" />
<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
<PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
<PackageReference Include="coverlet.collector" Version="10.0.1" />
<PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.6.0" />
</ItemGroup>

<ItemGroup>
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2 changes: 1 addition & 1 deletion RecursiveExtractor.Cli/RecursiveExtractor.Cli.csproj
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Expand Up @@ -29,7 +29,7 @@
</ItemGroup>
<ItemGroup>
<PackageReference Include="CommandLineParser" Version="2.9.1" />
<PackageReference Include="NLog.Extensions.Logging" Version="6.0.3" />
<PackageReference Include="NLog.Extensions.Logging" Version="6.1.3" />
</ItemGroup>

<ItemGroup>
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16 changes: 8 additions & 8 deletions RecursiveExtractor.Tests/ExtractorTests/DisposeBehaviorTests.cs
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Expand Up @@ -23,11 +23,11 @@ public static TheoryData<string, int, bool> DisposeData
var data = new TheoryData<string, int, bool>
{
{ "TestData.7z", 3, false },
{ "TestData.tar", 6, false },
{ "TestData.tar", 5, false },
{ "TestData.rar", 3, false },
{ "TestData.rar4", 3, false },
{ "TestData.tar.bz2", 6, false },
{ "TestData.tar.gz", 6, false },
{ "TestData.tar.bz2", 5, false },
{ "TestData.tar.gz", 5, false },
{ "TestData.tar.xz", 3, false },
{ "sysvbanner_1.0-17fakesync1_amd64.deb", 8, false },
{ "TestData.a", 3, false },
Expand All @@ -37,20 +37,20 @@ public static TheoryData<string, int, bool> DisposeData
{ "EmptyFile.txt", 1, false },
{ "TestData.zip", 5, true },
{ "TestData.7z", 3, true },
{ "TestData.tar", 6, true },
{ "TestData.tar", 5, true },
{ "TestData.rar", 3, true },
{ "TestData.rar4", 3, true },
{ "TestData.tar.bz2", 6, true },
{ "TestData.tar.gz", 6, true },
{ "TestData.tar.bz2", 5, true },
{ "TestData.tar.gz", 5, true },
{ "TestData.tar.xz", 3, true },
{ "sysvbanner_1.0-17fakesync1_amd64.deb", 8, true },
{ "TestData.a", 3, true },
{ "TestData.bsd.ar", 3, true },
{ "TestData.iso", 3, true },
{ "TestData.vhdx", 3, true },
{ "EmptyFile.txt", 1, true },
{ "TestDataArchivesNested.zip", RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? 54 : 52, true },
{ "TestDataArchivesNested.zip", RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? 54 : 52, false },
{ "TestDataArchivesNested.zip", RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? 51 : 49, true },
{ "TestDataArchivesNested.zip", RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? 51 : 49, false },
};
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
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14 changes: 9 additions & 5 deletions RecursiveExtractor.Tests/ExtractorTests/ExpectedNumFilesTests.cs
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Expand Up @@ -28,19 +28,21 @@ public static TheoryData<string, int> ArchiveData
{ "100trees.7z", 101 },
{ "TestData.zip", 5 },
{ "TestData.7z",3 },
{ "TestData.tar", 6 },
{ "TestData.tar", 5 },
{ "TestData.rar",3 },
{ "TestData.rar4",3 },
{ "TestData.tar.bz2", 6 },
{ "TestData.tar.gz", 6 },
{ "TestData.tar.bz2", 5 },
{ "TestData.tar.gz", 5 },
{ "TestData.tar.xz",3 },
{ "sysvbanner_1.0-17fakesync1_amd64.deb", 8 },
{ "TestData.a",3 },
{ "TestData.bsd.ar",3 },
{ "TestData.iso",3 },
{ "TestDataRockRidge.iso",2 },
{ "TestDataJolietRockRidge.iso",2 },
{ "TestData.vhdx",3 },
{ "EmptyFile.txt", 1 },
{ "TestDataArchivesNested.zip", RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? 54 : 52 },
{ "TestDataArchivesNested.zip", RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? 51 : 49 },
{ "UdfTest.iso", 3 },
{ "UdfTestWithMultiSystem.iso", 3 },
{ "TestData.arj", 1 },
Expand Down Expand Up @@ -69,7 +71,7 @@ public static TheoryData<string, int> NoRecursionData
{ "100trees.7z", 101 },
{ "TestData.zip", 5 },
{ "TestData.7z", 3 },
{ "TestData.tar", 6 },
{ "TestData.tar", 5 },
{ "TestData.rar", 3 },
{ "TestData.rar4", 3 },
{ "TestData.tar.bz2", 1 },
Expand All @@ -79,6 +81,8 @@ public static TheoryData<string, int> NoRecursionData
{ "TestData.a", 3 },
{ "TestData.bsd.ar", 3 },
{ "TestData.iso", 3 },
{ "TestDataRockRidge.iso", 2 },
{ "TestDataJolietRockRidge.iso", 2 },
{ "TestData.vhdx", 3 },
{ "EmptyFile.txt", 1 },
{ "TestDataArchivesNested.zip", 14 },
Expand Down
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