/// <exception cref="System.IO.IOException"></exception>
private PackFile WritePack <_T0, _T1>(ICollection <_T0> want, ICollection <_T1> have
, ICollection <ObjectId> tagTargets, IList <PackIndex> excludeObjects) where _T0 : ObjectId
where _T1 : ObjectId
{
FilePath tmpPack = null;
FilePath tmpIdx = null;
PackWriter pw = new PackWriter(repo);
try
{
// prepare the PackWriter
pw.SetDeltaBaseAsOffset(true);
pw.SetReuseDeltaCommits(false);
if (tagTargets != null)
{
pw.SetTagTargets(tagTargets);
}
if (excludeObjects != null)
{
foreach (PackIndex idx in excludeObjects)
{
pw.ExcludeObjects(idx);
}
}
pw.PreparePack(pm, want, have);
if (pw.GetObjectCount() == 0)
{
return(null);
}
// create temporary files
string id = pw.ComputeName().GetName();
FilePath packdir = new FilePath(repo.ObjectsDirectory, "pack");
tmpPack = FilePath.CreateTempFile("gc_", ".pack_tmp", packdir);
tmpIdx = new FilePath(packdir, Sharpen.Runtime.Substring(tmpPack.GetName(), 0, tmpPack
.GetName().LastIndexOf('.')) + ".idx_tmp");
if (!tmpIdx.CreateNewFile())
{
throw new IOException(MessageFormat.Format(JGitText.Get().cannotCreateIndexfile,
tmpIdx.GetPath()));
}
// write the packfile
FileChannel channel = new FileOutputStream(tmpPack).GetChannel();
OutputStream channelStream = Channels.NewOutputStream(channel);
try
{
pw.WritePack(pm, pm, channelStream);
}
finally
{
channel.Force(true);
channelStream.Close();
channel.Close();
}
// write the packindex
FileChannel idxChannel = new FileOutputStream(tmpIdx).GetChannel();
OutputStream idxStream = Channels.NewOutputStream(idxChannel);
try
{
pw.WriteIndex(idxStream);
}
finally
{
idxChannel.Force(true);
idxStream.Close();
idxChannel.Close();
}
// rename the temporary files to real files
FilePath realPack = NameFor(id, ".pack");
tmpPack.SetReadOnly();
FilePath realIdx = NameFor(id, ".idx");
realIdx.SetReadOnly();
bool delete = true;
try
{
if (!tmpPack.RenameTo(realPack))
{
return(null);
}
delete = false;
if (!tmpIdx.RenameTo(realIdx))
{
FilePath newIdx = new FilePath(realIdx.GetParentFile(), realIdx.GetName() + ".new"
);
if (!tmpIdx.RenameTo(newIdx))
{
newIdx = tmpIdx;
}
throw new IOException(MessageFormat.Format(JGitText.Get().panicCantRenameIndexFile
, newIdx, realIdx));
}
}
finally
{
if (delete && tmpPack.Exists())
{
tmpPack.Delete();
}
if (delete && tmpIdx.Exists())
{
tmpIdx.Delete();
}
}
return(((ObjectDirectory)repo.ObjectDatabase).OpenPack(realPack, realIdx));
}
finally
{
pw.Release();
if (tmpPack != null && tmpPack.Exists())
{
tmpPack.Delete();
}
if (tmpIdx != null && tmpIdx.Exists())
{
tmpIdx.Delete();
}
}
}