Improved extraction handling

StabilityMatrix.Avalonia/Assets.cs

@@ -3,6 +3,7 @@ using System.IO;
 using System.Runtime.Versioning;
 using System.Threading.Tasks;
 using Avalonia.Platform;
+using StabilityMatrix.Avalonia.Models;
 using StabilityMatrix.Core.Helper;
 
 namespace StabilityMatrix.Avalonia;
@@ -17,39 +18,18 @@ internal static class Assets
 
     [SupportedOSPlatform("windows")]
     [SupportedOSPlatform("linux")]
-    public static Uri SevenZipExecutable
-    {
-        get
-        {
-            if (Compat.IsWindows)
-            {
-                return new Uri("avares://StabilityMatrix.Avalonia/Assets/win-x64/7za.exe");
-            }
-            if (Compat.Platform.HasFlag(PlatformKind.Linux | PlatformKind.X64))
-            {
-                return new Uri("avares://StabilityMatrix.Avalonia/Assets/linux-x64/7zzs");
-            }
-            throw new PlatformNotSupportedException();
-        }
-    }
+    public static AvaloniaResource SevenZipExecutable => Compat.Switch(
+        (PlatformKind.Windows,
+            new AvaloniaResource("avares://StabilityMatrix.Avalonia/Assets/win-x64/7za.exe")),
+        (PlatformKind.Linux | PlatformKind.X64,
+            new AvaloniaResource("avares://StabilityMatrix.Avalonia/Assets/linux-x64/7zzs",
+                UnixFileMode.UserExecute | UnixFileMode.GroupExecute | UnixFileMode.OtherExecute)));
     
     [SupportedOSPlatform("windows")]
     [SupportedOSPlatform("linux")]
-    public static Uri SevenZipLicense
-    {
-        get
-        {
-            if (Compat.IsWindows)
-            {
-                return new Uri("avares://StabilityMatrix.Avalonia/Assets/win-x64/7za - LICENSE.txt");
-            }
-            if (Compat.Platform.HasFlag(PlatformKind.Linux | PlatformKind.X64))
-            {
-                return new Uri("avares://StabilityMatrix.Avalonia/Assets/linux-x64/7zzs - LICENSE.txt");
-            }
-            throw new PlatformNotSupportedException();
-        }
-    }
+    public static AvaloniaResource SevenZipLicense => Compat.Switch(
+        (PlatformKind.Windows, new AvaloniaResource("avares://StabilityMatrix.Avalonia/Assets/win-x64/7za - LICENSE.txt")),
+        (PlatformKind.Linux | PlatformKind.X64, new AvaloniaResource("avares://StabilityMatrix.Avalonia/Assets/linux-x64/7zzs - LICENSE.txt")));
     
     [SupportedOSPlatform("windows")]
     [SupportedOSPlatform("linux")]

StabilityMatrix.Avalonia/Helpers/UnixPrerequisiteHelper.cs

@@ -5,6 +5,7 @@ using System.Runtime.Versioning;
 using System.Threading.Tasks;
 using Avalonia;
 using Avalonia.Platform;
+using Avalonia.Utilities;
 using NLog;
 using StabilityMatrix.Core.Exceptions;
 using StabilityMatrix.Core.Helper;
@@ -57,11 +58,11 @@ public class UnixPrerequisiteHelper : IPrerequisiteHelper
         };
         
         progress?.Report(new ProgressReport(0, message: "Unpacking resources", isIndeterminate: true));
-
+        
         Directory.CreateDirectory(AssetsDir);
-        foreach (var (assetUri, extractTo) in assets)
+        foreach (var (asset, extractDir) in assets)
         {
-            await Assets.ExtractAsset(assetUri, extractTo);
+            await asset.ExtractTo(extractDir);
         }
         
         progress?.Report(new ProgressReport(1, message: "Unpacking resources", isIndeterminate: false));
@@ -112,7 +113,7 @@ public class UnixPrerequisiteHelper : IPrerequisiteHelper
                 await PythonDir.DeleteAsync(true);
             }
             progress?.Report(new ProgressReport(0, "Installing Python", isIndeterminate: true));
-            await ArchiveHelper.ExtractManaged(downloadPath, PythonDir);
+            await ArchiveHelper.Extract7ZAuto(downloadPath, PythonDir);
             
             // For Linux, move the inner 'python' folder up to the root PythonDir
             if (Compat.IsLinux)

StabilityMatrix.Avalonia/Models/AvaloniaResource.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Diagnostics.CodeAnalysis;
+using System.IO;
+using System.Threading.Tasks;
+using Avalonia.Platform;
+using StabilityMatrix.Core.Helper;
+
+namespace StabilityMatrix.Avalonia.Models;
+
+[SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
+public readonly record struct AvaloniaResource(
+    Uri UriPath, 
+    UnixFileMode WriteUnixFileMode = UnixFileMode.None)
+{
+    public string FileName => UriPath.Segments[^1];
+
+    public AvaloniaResource(string uriPath, UnixFileMode writeUnixFileMode = UnixFileMode.None) 
+        : this(new Uri(uriPath), writeUnixFileMode)
+    {
+    }
+    
+    /// <summary>
+    /// Extracts this resource to the output directory.
+    /// </summary>
+    public async Task ExtractTo(string outputDir, bool overwrite = true)
+    {
+        var targetPath = Path.Combine(outputDir, FileName);
+        if (File.Exists(targetPath) && !overwrite)
+        {
+            return;
+        }
+        var stream = AssetLoader.Open(UriPath);
+        await using var fileStream = File.Create(targetPath);
+        await stream.CopyToAsync(fileStream);
+        // Write permissions
+        if (!Compat.IsWindows && Compat.IsUnix && WriteUnixFileMode != UnixFileMode.None)
+        {
+            File.SetUnixFileMode(targetPath, WriteUnixFileMode);
+        }
+    }
+}

StabilityMatrix.Core/Helper/ArchiveHelper.cs

@@ -122,6 +122,58 @@ public static partial class ArchiveHelper
         var compressed = ulong.Parse(matches[1].Value);
         return new ArchiveInfo(size, compressed);
     }
+    
+    /// <summary>
+    /// Extracts a zipped tar (i.e. '.tar.gz') archive.
+    /// First extracts the zipped tar, then extracts the tar and removes the tar.
+    /// </summary>
+    /// <param name="archivePath"></param>
+    /// <param name="extractDirectory"></param>
+    /// <returns></returns>
+    public static async Task<ArchiveInfo> Extract7ZTar(string archivePath, string extractDirectory)
+    {
+        if (!archivePath.EndsWith(".tar.gz"))
+        {
+            throw new ArgumentException("Archive must be a zipped tar.");
+        }
+        // Extract the tar.gz to tar
+        await Extract7Z(archivePath, extractDirectory);
+        
+        // Extract the tar
+        var tarPath = Path.Combine(extractDirectory, Path.GetFileNameWithoutExtension(archivePath) + ".tar");
+        if (!File.Exists(tarPath))
+        {
+            throw new FileNotFoundException("Tar file not found.", tarPath);
+        }
+
+        try
+        {
+            return await Extract7Z(tarPath, extractDirectory);
+        }
+        finally
+        {
+            // Remove the tar
+            if (File.Exists(tarPath))
+            {
+                File.Delete(tarPath);
+            }
+        }
+    }
+
+    /// <summary>
+    /// Extracts with auto handling of tar.gz files.
+    /// </summary>
+    public static async Task<ArchiveInfo> Extract7ZAuto(string archivePath, string extractDirectory)
+    {
+        if (archivePath.EndsWith(".tar.gz"))
+        {
+            return await Extract7ZTar(archivePath, extractDirectory);
+        }
+        else
+        {
+            return await Extract7Z(archivePath, extractDirectory);
+        }
+    }
 
     /// <summary>
     /// Extract an archive to the output directory.
@@ -212,6 +264,8 @@ public static partial class ArchiveHelper
             var entry = reader.Entry;
             var outputPath = Path.Combine(outputDirectory, entry.Key);
             
+            Logger.Debug($"Extracting key: {entry.Key.ToRepr()}");
+            
             if (entry.IsDirectory)
             {
                 if (!Directory.Exists(outputPath))
@@ -255,7 +309,7 @@ public static partial class ArchiveHelper
                         // Delete path if exists
                         File.Delete(outputPath);
                         File.CreateSymbolicLink(outputPath, entry.LinkTarget);
-                        return;
+                        continue;
                     }
                     catch (IOException e)
                     {

StabilityMatrix.Core/Helper/Compat.cs

@@ -2,6 +2,7 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Runtime.InteropServices;
 using System.Runtime.Versioning;
+using StabilityMatrix.Core.Extensions;
 using StabilityMatrix.Core.Models.FileInterfaces;
 
 namespace StabilityMatrix.Core.Helper;
@@ -104,6 +105,27 @@ public static class Compat
         AppData = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
         AppDataHome = AppData + AppName;
     }
+
+    /// <summary>
+    /// Generic function to return different objects based on platform flags.
+    /// Parameters are checked in sequence with Compat.Platform.HasFlag,
+    /// the first match is returned.
+    /// </summary>
+    /// <exception cref="PlatformNotSupportedException">Thrown when no targets match</exception>
+    public static T Switch<T>(params (PlatformKind platform, T target)[] targets)
+    {
+        foreach (var (platform, target) in targets)
+        {
+            if (Platform.HasFlag(platform))
+            {
+                return target;
+            }
+        }
+        
+        throw new PlatformNotSupportedException(
+            $"Platform {Platform.ToString()} is not in supported targets: " +
+            $"{string.Join(", ", targets.Select(t => t.platform.ToString()))}");
+    }
     
     /// <summary>
     /// Get the current application executable name.