/**
* Builds and returns the layer {@link Blob}.
*
* @return the new layer
*/
public IBlob Build()
{
UniqueTarArchiveEntries uniqueTarArchiveEntries = new UniqueTarArchiveEntries();
// Adds all the layer entries as tar entries.
foreach (LayerEntry layerEntry in layerEntries)
{
// Adds the entries to uniqueTarArchiveEntries, which makes sure all entries are unique and
// adds parent directories for each extraction path.
TarEntry entry = TarEntry.CreateEntryFromFile(layerEntry.SourceFile);
entry.Name = layerEntry.ExtractionPath.ToString().TrimStart('/');
if (Directory.Exists(layerEntry.SourceFile))
{
entry.Name += '/';
entry.TarHeader.TypeFlag = TarHeader.LF_DIR;
}
// Sets the entry's permissions by masking out the permission bits from the entry's mode (the
// lowest 9 bits) then using a bitwise OR to set them to the layerEntry's permissions.
entry.SetMode((entry.GetMode() & ~PosixFilePermissions.All) | layerEntry.Permissions.GetPermissionBits());
entry.ModTime = DateTimeOffset.FromUnixTimeMilliseconds(layerEntry.LastModifiedTime.ToUnixTimeMilliseconds()).DateTime;
uniqueTarArchiveEntries.Add(entry);
}
// Gets the entries sorted by extraction path.
IList <TarEntry> sortedFilesystemEntries = uniqueTarArchiveEntries.GetSortedEntries();
HashSet <string> names = new HashSet <string>();
// Adds all the files to a tar stream.
TarStreamBuilder tarStreamBuilder = new TarStreamBuilder();
foreach (TarEntry entry in sortedFilesystemEntries)
{
// Strips out all non-reproducible elements from tar archive entries.
// Modified time is configured per entry
entry.TarHeader.GroupId = 0;
entry.TarHeader.UserId = 0;
entry.TarHeader.UserName = "";
entry.TarHeader.GroupName = "";
Debug.Assert(!names.Contains(entry.Name));
names.Add(entry.Name);
tarStreamBuilder.AddTarArchiveEntry(entry);
}
return(Blobs.From(tarStreamBuilder.WriteAsTarArchiveToAsync, -1));
}