feat: Add installing

It can install now.
Requires pexec to be present

This may be due to an upstream issue with spectre.console affecting how
stdin/stdout are handled.

TODO:
 - Add backup/restore functionality
 - Refactor sections for neatness
 - Improve UX

DebUnpack.cs

@@ -123,7 +123,7 @@ sealed class DebEntry
             throw new ArgumentException("buffer too short");
         }
 
-        name = Encoding.ASCII.GetString(buffer[0..16]);
+        name = Encoding.ASCII.GetString(buffer[0..16]).Trim(); // Trim any trailing whitespace
         mtime = long.Parse(Encoding.ASCII.GetString(buffer[16..28]));
         mode = int.Parse(Encoding.ASCII.GetString(buffer[28..34]));
         gid = int.Parse(Encoding.ASCII.GetString(buffer[34..40]));

Program.cs

@@ -3,6 +3,9 @@ using Serilog;
 using Spectre.Console;
 using System.Text.Json;
 using System.Text;
+using SharpCompress.Compressors.Xz;
+using System.Formats.Tar;
+using System.Diagnostics;
 
 namespace EdgeInstaller;
 
@@ -222,15 +225,12 @@ public static partial class EdgeInstall
 
         RenderPackageAsTable(LatestVersion);
 
-        var versionPath = LatestVersion.Filename
-            .Replace("pool/main/m/", "")
-            .Replace(".deb", "");
-
         var versionsDir = Path.Join(Archdir, "Versions");
+        var versionDir = Path.Join(versionsDir, LatestVersion.PackageName, LatestVersion.Version.ToString());
+        Directory.CreateDirectory(versionDir);
         // Let's get and unpack the latest version
 
-        if (true)//!Directory.Exists(Path.Join(versionsDir, versionPath)))
-        {
+        // for the moment we will always just grab
         using (MemoryStream debStream =
             await AnsiConsole.Progress()
             .Columns(new ProgressColumn[]
@@ -257,37 +257,80 @@ public static partial class EdgeInstall
 
             using (DebFile debfile = new DebFile(debStream))
             {
-                    foreach (var fileEntry in debfile.fileEntries)
-                    {
-                        AnsiConsole.MarkupLineInterpolated($"FileName: {fileEntry.name}");
-                        AnsiConsole.MarkupLineInterpolated($"FilePos: {fileEntry.offset}");
-                        AnsiConsole.MarkupLineInterpolated($"FileSize: {fileEntry.sizeBytes}");
 
-                        // NOTE: This is dumb test code
-                        // to verify the files are actually being "extracted" properly
+                // NOTE: deb entries have trailing /
+                DebEntry? dataEntry = debfile.fileEntries.Find(file => file.name == "data.tar.xz/");
 
-                        if (!debfile.getFile(fileEntry, out Stream contents))
+                if (dataEntry is null)
                 {
-                            return 1;
+                    AnsiConsole.MarkupLine("[red b]ERROR:[/] debfile does not contain data.tar.xz");
+                    Environment.Exit(1);
                 }
 
-                        // Now we write this to tmp.
-                        // WARN: Without deleting these you will fill up your ram
+                // Looks like we have a hit. Lets try and extract it
 
-                        var temp = Path.GetTempFileName();
-
-                        using (var tmpfile = File.Open(temp, FileMode.Open))
+                if (!debfile.getFile(dataEntry, out Stream dataStream))
                 {
-                            contents.CopyTo(tmpfile);
-                            contents.Dispose();
+                    AnsiConsole.MarkupLine("[red b]ERROR:[/] couldn't get stream for data.tar.xz");
+                    Environment.Exit(1);
+                }
+
+                using (XZStream dataXZStream = new(dataStream))
+                {
+                    using (TarReader reader = new(dataXZStream))
+                    {
+                        while (true)
+                        {
+                            var tarEntry = reader.GetNextEntry();
+                            if (tarEntry is null)
+                            {
+                                break; // TarReader returns null when we hit the end of the stream
+                            }
+
+                            AnsiConsole.MarkupLineInterpolated($"TarEntry {tarEntry.Name}");
+                            // work out where we need to put the extracted file
+                            var filepath = Path.Combine(versionDir, tarEntry.Name);
+
+                            if (tarEntry.EntryType == TarEntryType.Directory)
+                            {
+                                // createDirectory doesn't fail if already exists
+                                Directory.CreateDirectory(filepath);
+                                continue;
+                            }
+
+                            if (tarEntry.LinkName != "")
+                            {
+                                // Handle links manually
+                                if (File.Exists(filepath))
+                                {
+                                    File.Delete(filepath);
+                                }
+                                File.CreateSymbolicLink(filepath, tarEntry.LinkName);
+                                continue; // we are done with this file so keep going
+                            }
+
+                            tarEntry.ExtractToFile(filepath, overwrite: true);
                         }
                     }
                 }
+
+                // Now assuming nothing broke before now we can copy the files into the system directories.
+                // WARN: This is dangerous stuff and involves making system calls.
+
+                // NOTE: be sure when calling to other programs to wait until they exit.
+
+                var Mover = new ProcessStartInfo();
+
+                Mover.FileName = "pkexec";
+                Mover.Arguments = $"cp -dri {versionDir}/opt {versionDir}/usr /";
+                Mover.UseShellExecute = true;
+                var pr = Process.Start(Mover);
+                pr?.WaitForExit();
+            }
         }
 
         return 0;
     }
-    }
     /*TODO:
       - Check version
       - Offer update

edge-install.csproj

@@ -9,9 +9,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CST.RecursiveExtractor" Version="1.2.13" />
     <PackageReference Include="Serilog" Version="2.12.0" />
     <PackageReference Include="Serilog.Sinks.File" Version="5.0.0" />
+    <PackageReference Include="SharpCompress" Version="0.33.0" />
     <PackageReference Include="Spectre.Console" Version="0.47.0" />
     <PackageReference Include="System.Commandline" Version="2.0.0-beta4.22272.1" />
   </ItemGroup>