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using System;
using System.Globalization;
using System.IO;
using System.Text;
using LibGit2Sharp.Core;
namespace LibGit2Sharp
{
/// <summary>
/// Logic for tar archiving (not the actual tar format, but the overal logic related to tar+git) is taken
/// from https://github.com/git/git/blob/master/archive-tar.c.
/// </summary>
internal class TarArchiver : ArchiverBase, IDisposable
{
private readonly TarWriter writer;
public TarArchiver(FileStream output)
{
writer = new TarWriter(output);
}
#region Overrides of ArchiverBase
public override void BeforeArchiving(Tree tree, ObjectId oid, DateTimeOffset modificationTime)
{
if (oid == null)
{
return;
}
// Store the sha in the pax_global_header
using (var stream = new MemoryStream(Encoding.ASCII.GetBytes(
string.Format(CultureInfo.InvariantCulture, "52 comment={0}\n", oid.Sha))))
{
writer.Write("pax_global_header", stream, modificationTime, "666".OctalToInt32(),
"0", "0", 'g', "root", "root", "0", "0", oid.Sha, false);
}
}
protected override void AddTreeEntry(string path, TreeEntry entry, DateTimeOffset modificationTime)
{
switch (entry.Mode)
{
case Mode.GitLink:
case Mode.Directory:
writer.Write(path + "/", null, modificationTime, "775".OctalToInt32(),
"0", "0", '5', "root", "root", "0", "0", entry.TargetId.Sha, false);
break;
case Mode.ExecutableFile:
case Mode.NonExecutableFile:
case Mode.NonExecutableGroupWritableFile:
var blob = ((Blob) entry.Target);
WriteStream(path, entry, modificationTime,
() => blob.IsBinary ? blob.GetContentStream() : blob.GetContentStream(new FilteringOptions(path)));
break;
case Mode.SymbolicLink:
using (Stream contentStream = ((Blob)entry.Target).GetContentStream(new FilteringOptions(path)))
{
writer.Write(path, contentStream, modificationTime, "777".OctalToInt32(),
"0", "0", '2', "root", "root", "0", "0", entry.TargetId.Sha, true);
}
break;
default:
throw new InvalidOperationException(
string.Format(CultureInfo.InvariantCulture, "Unsupported file mode: {0} (sha1: {1}).", entry.Mode, entry.TargetId.Sha));
}
}
private void WriteStream(string path, TreeEntry entry, DateTimeOffset modificationTime, Func<Stream> streamer)
{
using (Stream contentStream = streamer())
{
writer.Write(path, contentStream, modificationTime,
(entry.Mode == Mode.ExecutableFile) ? "775".OctalToInt32() : "664".OctalToInt32(),
"0", "0", '0', "root", "root", "0", "0", entry.TargetId.Sha, false);
}
}
#endregion
#region Implementation of IDisposable
public void Dispose()
{
writer.Dispose();
}
#endregion
}
}
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