Aegisub/build/BuildTasks/TarballProject.cs

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// Copyright (c) 2014, Thomas Goyne <plorkyeran@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
// Aegisub Project http://www.aegisub.org/
using ICSharpCode.SharpZipLib.Tar;
using System;
using System.IO;
using System.Security.Cryptography;
namespace BuildTasks {
public class TarballProject : Microsoft.Build.Utilities.Task {
public string Url { get; set; }
public string Root { get; set; }
public string Hash { get; set; }
private bool NeedsUpdate() {
try {
return Hash != File.ReadAllText(Path.Combine(Root, "aegisub.hash"));
}
catch (IOException) {
return true;
}
}
private void ExtractEntry(string destDir, TarEntry entry, ICSharpCode.SharpZipLib.Tar.TarInputStream stream) {
string name = entry.Name;
if (Path.IsPathRooted(name))
name = name.Substring(Path.GetPathRoot(name).Length);
name = name.Replace('/', Path.DirectorySeparatorChar);
name = name.Substring(name.IndexOf(Path.DirectorySeparatorChar) + 1);
string dest = Path.Combine(destDir, name);
if (entry.IsDirectory)
Directory.CreateDirectory(dest);
else {
Directory.CreateDirectory(Path.GetDirectoryName(dest));
using (Stream outputStream = File.Create(dest)) {
stream.CopyEntryContents(outputStream);
}
}
}
public override bool Execute() {
if (!NeedsUpdate()) return true;
try {
var ms = new MemoryStream();
var downloadStream = new System.Net.WebClient().OpenRead(Url);
downloadStream.CopyTo(ms);
ms.Seek(0, SeekOrigin.Begin);
var hash = new SHA256Managed().ComputeHash(ms);
if (BitConverter.ToString(hash).Replace("-", "").ToLower() != this.Hash) {
Log.LogError("Got wrong hash for {0}", Url);
return false;
}
try {
Directory.Delete(Root, true);
}
catch (DirectoryNotFoundException) {
// Obviously not an issue
}
ms.Seek(0, SeekOrigin.Begin);
var bzStream = new ICSharpCode.SharpZipLib.BZip2.BZip2InputStream(ms);
var tarStream = new ICSharpCode.SharpZipLib.Tar.TarInputStream(bzStream);
while (true) {
TarEntry entry = tarStream.GetNextEntry();
if (entry == null) break;
ExtractEntry(Root, entry, tarStream);
}
File.WriteAllText(Path.Combine(Root, "aegisub.hash"), Hash);
return true;
}
catch (Exception e) {
Log.LogErrorFromException(e);
return false;
}
}
}
}